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| to_be_filed/sf_code/esrgpcpj/shared/tk_base/tktextdisp.c revision 29 by dashley, Sat Oct 8 07:08:47 2016 UTC | projs/trunk/shared_source/c_tk_base_7_5_w_mods/tktextdisp.c revision 71 by dashley, Sat Nov 5 11:07:06 2016 UTC | |
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| # | Line 1 | Line 1 |
| /* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/tk_base/tktextdisp.c,v 1.1.1.1 2001/06/13 05:10:16 dtashley Exp $ */ | ||
| /* | ||
| * tkTextDisp.c -- | ||
| * | ||
| * This module provides facilities to display text widgets. It is | ||
| * the only place where information is kept about the screen layout | ||
| * of text widgets. | ||
| * | ||
| * Copyright (c) 1992-1994 The Regents of the University of California. | ||
| * Copyright (c) 1994-1997 Sun Microsystems, Inc. | ||
| * | ||
| * See the file "license.terms" for information on usage and redistribution | ||
| * of this file, and for a DISCLAIMER OF ALL WARRANTIES. | ||
| * | ||
| * RCS: @(#) $Id: tktextdisp.c,v 1.1.1.1 2001/06/13 05:10:16 dtashley Exp $ | ||
| */ | ||
| #include "tkPort.h" | ||
| #include "tkInt.h" | ||
| #include "tkText.h" | ||
| #ifdef __WIN32__ | ||
| #include "tkWinInt.h" | ||
| #endif | ||
| /* | ||
| * The following structure describes how to display a range of characters. | ||
| * The information is generated by scanning all of the tags associated | ||
| * with the characters and combining that with default information for | ||
| * the overall widget. These structures form the hash keys for | ||
| * dInfoPtr->styleTable. | ||
| */ | ||
| typedef struct StyleValues { | ||
| Tk_3DBorder border; /* Used for drawing background under text. | ||
| * NULL means use widget background. */ | ||
| int borderWidth; /* Width of 3-D border for background. */ | ||
| int relief; /* 3-D relief for background. */ | ||
| Pixmap bgStipple; /* Stipple bitmap for background. None | ||
| * means draw solid. */ | ||
| XColor *fgColor; /* Foreground color for text. */ | ||
| Tk_Font tkfont; /* Font for displaying text. */ | ||
| Pixmap fgStipple; /* Stipple bitmap for text and other | ||
| * foreground stuff. None means draw | ||
| * solid.*/ | ||
| int justify; /* Justification style for text. */ | ||
| int lMargin1; /* Left margin, in pixels, for first display | ||
| * line of each text line. */ | ||
| int lMargin2; /* Left margin, in pixels, for second and | ||
| * later display lines of each text line. */ | ||
| int offset; /* Offset in pixels of baseline, relative to | ||
| * baseline of line. */ | ||
| int overstrike; /* Non-zero means draw overstrike through | ||
| * text. */ | ||
| int rMargin; /* Right margin, in pixels. */ | ||
| int spacing1; /* Spacing above first dline in text line. */ | ||
| int spacing2; /* Spacing between lines of dline. */ | ||
| int spacing3; /* Spacing below last dline in text line. */ | ||
| TkTextTabArray *tabArrayPtr;/* Locations and types of tab stops (may | ||
| * be NULL). */ | ||
| int underline; /* Non-zero means draw underline underneath | ||
| * text. */ | ||
| int elide; /* Non-zero means draw text */ | ||
| TkWrapMode wrapMode; /* How to handle wrap-around for this tag. | ||
| * One of TEXT_WRAPMODE_CHAR, | ||
| * TEXT_WRAPMODE_NONE or TEXT_WRAPMODE_WORD.*/ | ||
| } StyleValues; | ||
| /* | ||
| * The following structure extends the StyleValues structure above with | ||
| * graphics contexts used to actually draw the characters. The entries | ||
| * in dInfoPtr->styleTable point to structures of this type. | ||
| */ | ||
| typedef struct TextStyle { | ||
| int refCount; /* Number of times this structure is | ||
| * referenced in Chunks. */ | ||
| GC bgGC; /* Graphics context for background. None | ||
| * means use widget background. */ | ||
| GC fgGC; /* Graphics context for foreground. */ | ||
| StyleValues *sValuePtr; /* Raw information from which GCs were | ||
| * derived. */ | ||
| Tcl_HashEntry *hPtr; /* Pointer to entry in styleTable. Used | ||
| * to delete entry. */ | ||
| } TextStyle; | ||
| /* | ||
| * The following macro determines whether two styles have the same | ||
| * background so that, for example, no beveled border should be drawn | ||
| * between them. | ||
| */ | ||
| #define SAME_BACKGROUND(s1, s2) \ | ||
| (((s1)->sValuePtr->border == (s2)->sValuePtr->border) \ | ||
| && ((s1)->sValuePtr->borderWidth == (s2)->sValuePtr->borderWidth) \ | ||
| && ((s1)->sValuePtr->relief == (s2)->sValuePtr->relief) \ | ||
| && ((s1)->sValuePtr->bgStipple == (s2)->sValuePtr->bgStipple)) | ||
| /* | ||
| * The following structure describes one line of the display, which may | ||
| * be either part or all of one line of the text. | ||
| */ | ||
| typedef struct DLine { | ||
| TkTextIndex index; /* Identifies first character in text | ||
| * that is displayed on this line. */ | ||
| int byteCount; /* Number of bytes accounted for by this | ||
| * display line, including a trailing space | ||
| * or newline that isn't actually displayed. */ | ||
| int y; /* Y-position at which line is supposed to | ||
| * be drawn (topmost pixel of rectangular | ||
| * area occupied by line). */ | ||
| int oldY; /* Y-position at which line currently | ||
| * appears on display. -1 means line isn't | ||
| * currently visible on display and must be | ||
| * redrawn. This is used to move lines by | ||
| * scrolling rather than re-drawing. */ | ||
| int height; /* Height of line, in pixels. */ | ||
| int baseline; /* Offset of text baseline from y, in | ||
| * pixels. */ | ||
| int spaceAbove; /* How much extra space was added to the | ||
| * top of the line because of spacing | ||
| * options. This is included in height | ||
| * and baseline. */ | ||
| int spaceBelow; /* How much extra space was added to the | ||
| * bottom of the line because of spacing | ||
| * options. This is included in height. */ | ||
| int length; /* Total length of line, in pixels. */ | ||
| TkTextDispChunk *chunkPtr; /* Pointer to first chunk in list of all | ||
| * of those that are displayed on this | ||
| * line of the screen. */ | ||
| struct DLine *nextPtr; /* Next in list of all display lines for | ||
| * this window. The list is sorted in | ||
| * order from top to bottom. Note: the | ||
| * next DLine doesn't always correspond | ||
| * to the next line of text: (a) can have | ||
| * multiple DLines for one text line, and | ||
| * (b) can have gaps where DLine's have been | ||
| * deleted because they're out of date. */ | ||
| int flags; /* Various flag bits: see below for values. */ | ||
| } DLine; | ||
| /* | ||
| * Flag bits for DLine structures: | ||
| * | ||
| * HAS_3D_BORDER - Non-zero means that at least one of the | ||
| * chunks in this line has a 3D border, so | ||
| * it potentially interacts with 3D borders | ||
| * in neighboring lines (see | ||
| * DisplayLineBackground). | ||
| * NEW_LAYOUT - Non-zero means that the line has been | ||
| * re-layed out since the last time the | ||
| * display was updated. | ||
| * TOP_LINE - Non-zero means that this was the top line | ||
| * in the window the last time that the window | ||
| * was laid out. This is important because | ||
| * a line may be displayed differently if its | ||
| * at the top or bottom than if it's in the | ||
| * middle (e.g. beveled edges aren't displayed | ||
| * for middle lines if the adjacent line has | ||
| * a similar background). | ||
| * BOTTOM_LINE - Non-zero means that this was the bottom line | ||
| * in the window the last time that the window | ||
| * was laid out. | ||
| * IS_DISABLED - This Dline cannot be edited. | ||
| */ | ||
| #define HAS_3D_BORDER 1 | ||
| #define NEW_LAYOUT 2 | ||
| #define TOP_LINE 4 | ||
| #define BOTTOM_LINE 8 | ||
| #define IS_DISABLED 16 | ||
| /* | ||
| * Overall display information for a text widget: | ||
| */ | ||
| typedef struct TextDInfo { | ||
| Tcl_HashTable styleTable; /* Hash table that maps from StyleValues | ||
| * to TextStyles for this widget. */ | ||
| DLine *dLinePtr; /* First in list of all display lines for | ||
| * this widget, in order from top to bottom. */ | ||
| GC copyGC; /* Graphics context for copying from off- | ||
| * screen pixmaps onto screen. */ | ||
| GC scrollGC; /* Graphics context for copying from one place | ||
| * in the window to another (scrolling): | ||
| * differs from copyGC in that we need to get | ||
| * GraphicsExpose events. */ | ||
| int x; /* First x-coordinate that may be used for | ||
| * actually displaying line information. | ||
| * Leaves space for border, etc. */ | ||
| int y; /* First y-coordinate that may be used for | ||
| * actually displaying line information. | ||
| * Leaves space for border, etc. */ | ||
| int maxX; /* First x-coordinate to right of available | ||
| * space for displaying lines. */ | ||
| int maxY; /* First y-coordinate below available | ||
| * space for displaying lines. */ | ||
| int topOfEof; /* Top-most pixel (lowest y-value) that has | ||
| * been drawn in the appropriate fashion for | ||
| * the portion of the window after the last | ||
| * line of the text. This field is used to | ||
| * figure out when to redraw part or all of | ||
| * the eof field. */ | ||
| /* | ||
| * Information used for scrolling: | ||
| */ | ||
| int newByteOffset; /* Desired x scroll position, measured as the | ||
| * number of average-size characters off-screen | ||
| * to the left for a line with no left | ||
| * margin. */ | ||
| int curPixelOffset; /* Actual x scroll position, measured as the | ||
| * number of pixels off-screen to the left. */ | ||
| int maxLength; /* Length in pixels of longest line that's | ||
| * visible in window (length may exceed window | ||
| * size). If there's no wrapping, this will | ||
| * be zero. */ | ||
| double xScrollFirst, xScrollLast; | ||
| /* Most recent values reported to horizontal | ||
| * scrollbar; used to eliminate unnecessary | ||
| * reports. */ | ||
| double yScrollFirst, yScrollLast; | ||
| /* Most recent values reported to vertical | ||
| * scrollbar; used to eliminate unnecessary | ||
| * reports. */ | ||
| /* | ||
| * The following information is used to implement scanning: | ||
| */ | ||
| int scanMarkIndex; /* Byte index of character that was at the | ||
| * left edge of the window when the scan | ||
| * started. */ | ||
| int scanMarkX; /* X-position of mouse at time scan started. */ | ||
| int scanTotalScroll; /* Total scrolling (in screen lines) that has | ||
| * occurred since scanMarkY was set. */ | ||
| int scanMarkY; /* Y-position of mouse at time scan started. */ | ||
| /* | ||
| * Miscellaneous information: | ||
| */ | ||
| int dLinesInvalidated; /* This value is set to 1 whenever something | ||
| * happens that invalidates information in | ||
| * DLine structures; if a redisplay | ||
| * is in progress, it will see this and | ||
| * abort the redisplay. This is needed | ||
| * because, for example, an embedded window | ||
| * could change its size when it is first | ||
| * displayed, invalidating the DLine that | ||
| * is currently being displayed. If redisplay | ||
| * continues, it will use freed memory and | ||
| * could dump core. */ | ||
| int flags; /* Various flag values: see below for | ||
| * definitions. */ | ||
| } TextDInfo; | ||
| /* | ||
| * In TkTextDispChunk structures for character segments, the clientData | ||
| * field points to one of the following structures: | ||
| */ | ||
| typedef struct CharInfo { | ||
| int numBytes; /* Number of bytes to display. */ | ||
| char chars[4]; /* UTF characters to display. Actual size | ||
| * will be numBytes, not 4. THIS MUST BE | ||
| * THE LAST FIELD IN THE STRUCTURE. */ | ||
| } CharInfo; | ||
| /* | ||
| * Flag values for TextDInfo structures: | ||
| * | ||
| * DINFO_OUT_OF_DATE: Non-zero means that the DLine structures | ||
| * for this window are partially or completely | ||
| * out of date and need to be recomputed. | ||
| * REDRAW_PENDING: Means that a when-idle handler has been | ||
| * scheduled to update the display. | ||
| * REDRAW_BORDERS: Means window border or pad area has | ||
| * potentially been damaged and must be redrawn. | ||
| * REPICK_NEEDED: 1 means that the widget has been modified | ||
| * in a way that could change the current | ||
| * character (a different character might be | ||
| * under the mouse cursor now). Need to | ||
| * recompute the current character before | ||
| * the next redisplay. | ||
| */ | ||
| #define DINFO_OUT_OF_DATE 1 | ||
| #define REDRAW_PENDING 2 | ||
| #define REDRAW_BORDERS 4 | ||
| #define REPICK_NEEDED 8 | ||
| /* | ||
| * The following counters keep statistics about redisplay that can be | ||
| * checked to see how clever this code is at reducing redisplays. | ||
| */ | ||
| static int numRedisplays; /* Number of calls to DisplayText. */ | ||
| static int linesRedrawn; /* Number of calls to DisplayDLine. */ | ||
| static int numCopies; /* Number of calls to XCopyArea to copy part | ||
| * of the screen. */ | ||
| /* | ||
| * Forward declarations for procedures defined later in this file: | ||
| */ | ||
| static void AdjustForTab _ANSI_ARGS_((TkText *textPtr, | ||
| TkTextTabArray *tabArrayPtr, int index, | ||
| TkTextDispChunk *chunkPtr)); | ||
| static void CharBboxProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr, | ||
| int index, int y, int lineHeight, int baseline, | ||
| int *xPtr, int *yPtr, int *widthPtr, | ||
| int *heightPtr)); | ||
| static void CharDisplayProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr, | ||
| int x, int y, int height, int baseline, | ||
| Display *display, Drawable dst, int screenY)); | ||
| static int CharMeasureProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr, | ||
| int x)); | ||
| static void CharUndisplayProc _ANSI_ARGS_((TkText *textPtr, | ||
| TkTextDispChunk *chunkPtr)); | ||
| /* | ||
| Definitions of elided procs. | ||
| Compiler can't inline these since we use pointers to these functions. | ||
| ElideDisplayProc, ElideUndisplayProc special-cased for speed, | ||
| as potentially many elided DLine chunks if large, tag toggle-filled | ||
| elided region. | ||
| */ | ||
| static void ElideBboxProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr, | ||
| int index, int y, int lineHeight, int baseline, | ||
| int *xPtr, int *yPtr, int *widthPtr, | ||
| int *heightPtr)); | ||
| static int ElideMeasureProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr, | ||
| int x)); | ||
| static void DisplayDLine _ANSI_ARGS_((TkText *textPtr, | ||
| DLine *dlPtr, DLine *prevPtr, Pixmap pixmap)); | ||
| static void DisplayLineBackground _ANSI_ARGS_((TkText *textPtr, | ||
| DLine *dlPtr, DLine *prevPtr, Pixmap pixmap)); | ||
| static void DisplayText _ANSI_ARGS_((ClientData clientData)); | ||
| static DLine * FindDLine _ANSI_ARGS_((DLine *dlPtr, | ||
| TkTextIndex *indexPtr)); | ||
| static void FreeDLines _ANSI_ARGS_((TkText *textPtr, | ||
| DLine *firstPtr, DLine *lastPtr, int unlink)); | ||
| static void FreeStyle _ANSI_ARGS_((TkText *textPtr, | ||
| TextStyle *stylePtr)); | ||
| static TextStyle * GetStyle _ANSI_ARGS_((TkText *textPtr, | ||
| TkTextIndex *indexPtr)); | ||
| static void GetXView _ANSI_ARGS_((Tcl_Interp *interp, | ||
| TkText *textPtr, int report)); | ||
| static void GetYView _ANSI_ARGS_((Tcl_Interp *interp, | ||
| TkText *textPtr, int report)); | ||
| static DLine * LayoutDLine _ANSI_ARGS_((TkText *textPtr, | ||
| TkTextIndex *indexPtr)); | ||
| static int MeasureChars _ANSI_ARGS_((Tk_Font tkfont, | ||
| CONST char *source, int maxBytes, int startX, | ||
| int maxX, int tabOrigin, int *nextXPtr)); | ||
| static void MeasureUp _ANSI_ARGS_((TkText *textPtr, | ||
| TkTextIndex *srcPtr, int distance, | ||
| TkTextIndex *dstPtr)); | ||
| static int NextTabStop _ANSI_ARGS_((Tk_Font tkfont, int x, | ||
| int tabOrigin)); | ||
| static void UpdateDisplayInfo _ANSI_ARGS_((TkText *textPtr)); | ||
| static void ScrollByLines _ANSI_ARGS_((TkText *textPtr, | ||
| int offset)); | ||
| static int SizeOfTab _ANSI_ARGS_((TkText *textPtr, | ||
| TkTextTabArray *tabArrayPtr, int index, int x, | ||
| int maxX)); | ||
| static void TextInvalidateRegion _ANSI_ARGS_((TkText *textPtr, | ||
| TkRegion region)); | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * TkTextCreateDInfo -- | ||
| * | ||
| * This procedure is called when a new text widget is created. | ||
| * Its job is to set up display-related information for the widget. | ||
| * | ||
| * Results: | ||
| * None. | ||
| * | ||
| * Side effects: | ||
| * A TextDInfo data structure is allocated and initialized and attached | ||
| * to textPtr. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| void | ||
| TkTextCreateDInfo(textPtr) | ||
| TkText *textPtr; /* Overall information for text widget. */ | ||
| { | ||
| register TextDInfo *dInfoPtr; | ||
| XGCValues gcValues; | ||
| dInfoPtr = (TextDInfo *) ckalloc(sizeof(TextDInfo)); | ||
| Tcl_InitHashTable(&dInfoPtr->styleTable, sizeof(StyleValues)/sizeof(int)); | ||
| dInfoPtr->dLinePtr = NULL; | ||
| dInfoPtr->copyGC = None; | ||
| gcValues.graphics_exposures = True; | ||
| dInfoPtr->scrollGC = Tk_GetGC(textPtr->tkwin, GCGraphicsExposures, | ||
| &gcValues); | ||
| dInfoPtr->topOfEof = 0; | ||
| dInfoPtr->newByteOffset = 0; | ||
| dInfoPtr->curPixelOffset = 0; | ||
| dInfoPtr->maxLength = 0; | ||
| dInfoPtr->xScrollFirst = -1; | ||
| dInfoPtr->xScrollLast = -1; | ||
| dInfoPtr->yScrollFirst = -1; | ||
| dInfoPtr->yScrollLast = -1; | ||
| dInfoPtr->scanMarkIndex = 0; | ||
| dInfoPtr->scanMarkX = 0; | ||
| dInfoPtr->scanTotalScroll = 0; | ||
| dInfoPtr->scanMarkY = 0; | ||
| dInfoPtr->dLinesInvalidated = 0; | ||
| dInfoPtr->flags = DINFO_OUT_OF_DATE; | ||
| textPtr->dInfoPtr = dInfoPtr; | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * TkTextFreeDInfo -- | ||
| * | ||
| * This procedure is called to free up all of the private display | ||
| * information kept by this file for a text widget. | ||
| * | ||
| * Results: | ||
| * None. | ||
| * | ||
| * Side effects: | ||
| * Lots of resources get freed. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| void | ||
| TkTextFreeDInfo(textPtr) | ||
| TkText *textPtr; /* Overall information for text widget. */ | ||
| { | ||
| register TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| /* | ||
| * Be careful to free up styleTable *after* freeing up all the | ||
| * DLines, so that the hash table is still intact to free up the | ||
| * style-related information from the lines. Once the lines are | ||
| * all free then styleTable will be empty. | ||
| */ | ||
| FreeDLines(textPtr, dInfoPtr->dLinePtr, (DLine *) NULL, 1); | ||
| Tcl_DeleteHashTable(&dInfoPtr->styleTable); | ||
| if (dInfoPtr->copyGC != None) { | ||
| Tk_FreeGC(textPtr->display, dInfoPtr->copyGC); | ||
| } | ||
| Tk_FreeGC(textPtr->display, dInfoPtr->scrollGC); | ||
| if (dInfoPtr->flags & REDRAW_PENDING) { | ||
| Tcl_CancelIdleCall(DisplayText, (ClientData) textPtr); | ||
| } | ||
| ckfree((char *) dInfoPtr); | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * GetStyle -- | ||
| * | ||
| * This procedure creates all the information needed to display | ||
| * text at a particular location. | ||
| * | ||
| * Results: | ||
| * The return value is a pointer to a TextStyle structure that | ||
| * corresponds to *sValuePtr. | ||
| * | ||
| * Side effects: | ||
| * A new entry may be created in the style table for the widget. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| static TextStyle * | ||
| GetStyle(textPtr, indexPtr) | ||
| TkText *textPtr; /* Overall information about text widget. */ | ||
| TkTextIndex *indexPtr; /* The character in the text for which | ||
| * display information is wanted. */ | ||
| { | ||
| TkTextTag **tagPtrs; | ||
| register TkTextTag *tagPtr; | ||
| StyleValues styleValues; | ||
| TextStyle *stylePtr; | ||
| Tcl_HashEntry *hPtr; | ||
| int numTags, new, i; | ||
| XGCValues gcValues; | ||
| unsigned long mask; | ||
| /* | ||
| * The variables below keep track of the highest-priority specification | ||
| * that has occurred for each of the various fields of the StyleValues. | ||
| */ | ||
| int borderPrio, borderWidthPrio, reliefPrio, bgStipplePrio; | ||
| int fgPrio, fontPrio, fgStipplePrio; | ||
| int underlinePrio, elidePrio, justifyPrio, offsetPrio; | ||
| int lMargin1Prio, lMargin2Prio, rMarginPrio; | ||
| int spacing1Prio, spacing2Prio, spacing3Prio; | ||
| int overstrikePrio, tabPrio, wrapPrio; | ||
| /* | ||
| * Find out what tags are present for the character, then compute | ||
| * a StyleValues structure corresponding to those tags (scan | ||
| * through all of the tags, saving information for the highest- | ||
| * priority tag). | ||
| */ | ||
| tagPtrs = TkBTreeGetTags(indexPtr, &numTags); | ||
| borderPrio = borderWidthPrio = reliefPrio = bgStipplePrio = -1; | ||
| fgPrio = fontPrio = fgStipplePrio = -1; | ||
| underlinePrio = elidePrio = justifyPrio = offsetPrio = -1; | ||
| lMargin1Prio = lMargin2Prio = rMarginPrio = -1; | ||
| spacing1Prio = spacing2Prio = spacing3Prio = -1; | ||
| overstrikePrio = tabPrio = wrapPrio = -1; | ||
| memset((VOID *) &styleValues, 0, sizeof(StyleValues)); | ||
| styleValues.relief = TK_RELIEF_FLAT; | ||
| styleValues.fgColor = textPtr->fgColor; | ||
| styleValues.tkfont = textPtr->tkfont; | ||
| styleValues.justify = TK_JUSTIFY_LEFT; | ||
| styleValues.spacing1 = textPtr->spacing1; | ||
| styleValues.spacing2 = textPtr->spacing2; | ||
| styleValues.spacing3 = textPtr->spacing3; | ||
| styleValues.tabArrayPtr = textPtr->tabArrayPtr; | ||
| styleValues.wrapMode = textPtr->wrapMode; | ||
| styleValues.elide = 0; | ||
| for (i = 0 ; i < numTags; i++) { | ||
| tagPtr = tagPtrs[i]; | ||
| /* | ||
| * On Windows and Mac, we need to skip the selection tag if | ||
| * we don't have focus. | ||
| */ | ||
| #ifndef ALWAYS_SHOW_SELECTION | ||
| if ((tagPtr == textPtr->selTagPtr) && !(textPtr->flags & GOT_FOCUS)) { | ||
| continue; | ||
| } | ||
| #endif | ||
| if ((tagPtr->border != NULL) && (tagPtr->priority > borderPrio)) { | ||
| styleValues.border = tagPtr->border; | ||
| borderPrio = tagPtr->priority; | ||
| } | ||
| if ((tagPtr->bdString != NULL) | ||
| && (tagPtr->priority > borderWidthPrio)) { | ||
| styleValues.borderWidth = tagPtr->borderWidth; | ||
| borderWidthPrio = tagPtr->priority; | ||
| } | ||
| if ((tagPtr->reliefString != NULL) | ||
| && (tagPtr->priority > reliefPrio)) { | ||
| if (styleValues.border == NULL) { | ||
| styleValues.border = textPtr->border; | ||
| } | ||
| styleValues.relief = tagPtr->relief; | ||
| reliefPrio = tagPtr->priority; | ||
| } | ||
| if ((tagPtr->bgStipple != None) | ||
| && (tagPtr->priority > bgStipplePrio)) { | ||
| styleValues.bgStipple = tagPtr->bgStipple; | ||
| bgStipplePrio = tagPtr->priority; | ||
| } | ||
| if ((tagPtr->fgColor != None) && (tagPtr->priority > fgPrio)) { | ||
| styleValues.fgColor = tagPtr->fgColor; | ||
| fgPrio = tagPtr->priority; | ||
| } | ||
| if ((tagPtr->tkfont != None) && (tagPtr->priority > fontPrio)) { | ||
| styleValues.tkfont = tagPtr->tkfont; | ||
| fontPrio = tagPtr->priority; | ||
| } | ||
| if ((tagPtr->fgStipple != None) | ||
| && (tagPtr->priority > fgStipplePrio)) { | ||
| styleValues.fgStipple = tagPtr->fgStipple; | ||
| fgStipplePrio = tagPtr->priority; | ||
| } | ||
| if ((tagPtr->justifyString != NULL) | ||
| && (tagPtr->priority > justifyPrio)) { | ||
| styleValues.justify = tagPtr->justify; | ||
| justifyPrio = tagPtr->priority; | ||
| } | ||
| if ((tagPtr->lMargin1String != NULL) | ||
| && (tagPtr->priority > lMargin1Prio)) { | ||
| styleValues.lMargin1 = tagPtr->lMargin1; | ||
| lMargin1Prio = tagPtr->priority; | ||
| } | ||
| if ((tagPtr->lMargin2String != NULL) | ||
| && (tagPtr->priority > lMargin2Prio)) { | ||
| styleValues.lMargin2 = tagPtr->lMargin2; | ||
| lMargin2Prio = tagPtr->priority; | ||
| } | ||
| if ((tagPtr->offsetString != NULL) | ||
| && (tagPtr->priority > offsetPrio)) { | ||
| styleValues.offset = tagPtr->offset; | ||
| offsetPrio = tagPtr->priority; | ||
| } | ||
| if ((tagPtr->overstrikeString != NULL) | ||
| && (tagPtr->priority > overstrikePrio)) { | ||
| styleValues.overstrike = tagPtr->overstrike; | ||
| overstrikePrio = tagPtr->priority; | ||
| } | ||
| if ((tagPtr->rMarginString != NULL) | ||
| && (tagPtr->priority > rMarginPrio)) { | ||
| styleValues.rMargin = tagPtr->rMargin; | ||
| rMarginPrio = tagPtr->priority; | ||
| } | ||
| if ((tagPtr->spacing1String != NULL) | ||
| && (tagPtr->priority > spacing1Prio)) { | ||
| styleValues.spacing1 = tagPtr->spacing1; | ||
| spacing1Prio = tagPtr->priority; | ||
| } | ||
| if ((tagPtr->spacing2String != NULL) | ||
| && (tagPtr->priority > spacing2Prio)) { | ||
| styleValues.spacing2 = tagPtr->spacing2; | ||
| spacing2Prio = tagPtr->priority; | ||
| } | ||
| if ((tagPtr->spacing3String != NULL) | ||
| && (tagPtr->priority > spacing3Prio)) { | ||
| styleValues.spacing3 = tagPtr->spacing3; | ||
| spacing3Prio = tagPtr->priority; | ||
| } | ||
| if ((tagPtr->tabString != NULL) | ||
| && (tagPtr->priority > tabPrio)) { | ||
| styleValues.tabArrayPtr = tagPtr->tabArrayPtr; | ||
| tabPrio = tagPtr->priority; | ||
| } | ||
| if ((tagPtr->underlineString != NULL) | ||
| && (tagPtr->priority > underlinePrio)) { | ||
| styleValues.underline = tagPtr->underline; | ||
| underlinePrio = tagPtr->priority; | ||
| } | ||
| if ((tagPtr->elideString != NULL) | ||
| && (tagPtr->priority > elidePrio)) { | ||
| styleValues.elide = tagPtr->elide; | ||
| elidePrio = tagPtr->priority; | ||
| } | ||
| if ((tagPtr->wrapMode != TEXT_WRAPMODE_NULL) | ||
| && (tagPtr->priority > wrapPrio)) { | ||
| styleValues.wrapMode = tagPtr->wrapMode; | ||
| wrapPrio = tagPtr->priority; | ||
| } | ||
| } | ||
| if (tagPtrs != NULL) { | ||
| ckfree((char *) tagPtrs); | ||
| } | ||
| /* | ||
| * Use an existing style if there's one around that matches. | ||
| */ | ||
| hPtr = Tcl_CreateHashEntry(&textPtr->dInfoPtr->styleTable, | ||
| (char *) &styleValues, &new); | ||
| if (!new) { | ||
| stylePtr = (TextStyle *) Tcl_GetHashValue(hPtr); | ||
| stylePtr->refCount++; | ||
| return stylePtr; | ||
| } | ||
| /* | ||
| * No existing style matched. Make a new one. | ||
| */ | ||
| stylePtr = (TextStyle *) ckalloc(sizeof(TextStyle)); | ||
| stylePtr->refCount = 1; | ||
| if (styleValues.border != NULL) { | ||
| gcValues.foreground = Tk_3DBorderColor(styleValues.border)->pixel; | ||
| mask = GCForeground; | ||
| if (styleValues.bgStipple != None) { | ||
| gcValues.stipple = styleValues.bgStipple; | ||
| gcValues.fill_style = FillStippled; | ||
| mask |= GCStipple|GCFillStyle; | ||
| } | ||
| stylePtr->bgGC = Tk_GetGC(textPtr->tkwin, mask, &gcValues); | ||
| } else { | ||
| stylePtr->bgGC = None; | ||
| } | ||
| mask = GCFont; | ||
| gcValues.font = Tk_FontId(styleValues.tkfont); | ||
| mask |= GCForeground; | ||
| gcValues.foreground = styleValues.fgColor->pixel; | ||
| if (styleValues.fgStipple != None) { | ||
| gcValues.stipple = styleValues.fgStipple; | ||
| gcValues.fill_style = FillStippled; | ||
| mask |= GCStipple|GCFillStyle; | ||
| } | ||
| stylePtr->fgGC = Tk_GetGC(textPtr->tkwin, mask, &gcValues); | ||
| stylePtr->sValuePtr = (StyleValues *) | ||
| Tcl_GetHashKey(&textPtr->dInfoPtr->styleTable, hPtr); | ||
| stylePtr->hPtr = hPtr; | ||
| Tcl_SetHashValue(hPtr, stylePtr); | ||
| return stylePtr; | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * FreeStyle -- | ||
| * | ||
| * This procedure is called when a TextStyle structure is no longer | ||
| * needed. It decrements the reference count and frees up the | ||
| * space for the style structure if the reference count is 0. | ||
| * | ||
| * Results: | ||
| * None. | ||
| * | ||
| * Side effects: | ||
| * The storage and other resources associated with the style | ||
| * are freed up if no-one's still using it. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| static void | ||
| FreeStyle(textPtr, stylePtr) | ||
| TkText *textPtr; /* Information about overall widget. */ | ||
| register TextStyle *stylePtr; /* Information about style to free. */ | ||
| { | ||
| stylePtr->refCount--; | ||
| if (stylePtr->refCount == 0) { | ||
| if (stylePtr->bgGC != None) { | ||
| Tk_FreeGC(textPtr->display, stylePtr->bgGC); | ||
| } | ||
| if (stylePtr->fgGC != None) { | ||
| Tk_FreeGC(textPtr->display, stylePtr->fgGC); | ||
| } | ||
| Tcl_DeleteHashEntry(stylePtr->hPtr); | ||
| ckfree((char *) stylePtr); | ||
| } | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * LayoutDLine -- | ||
| * | ||
| * This procedure generates a single DLine structure for a display | ||
| * line whose leftmost character is given by indexPtr. | ||
| * | ||
| * Results: | ||
| * The return value is a pointer to a DLine structure desribing the | ||
| * display line. All fields are filled in and correct except for | ||
| * y and nextPtr. | ||
| * | ||
| * Side effects: | ||
| * Storage is allocated for the new DLine. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| static DLine * | ||
| LayoutDLine(textPtr, indexPtr) | ||
| TkText *textPtr; /* Overall information about text widget. */ | ||
| TkTextIndex *indexPtr; /* Beginning of display line. May not | ||
| * necessarily point to a character segment. */ | ||
| { | ||
| register DLine *dlPtr; /* New display line. */ | ||
| TkTextSegment *segPtr; /* Current segment in text. */ | ||
| TkTextDispChunk *lastChunkPtr; /* Last chunk allocated so far | ||
| * for line. */ | ||
| TkTextDispChunk *chunkPtr; /* Current chunk. */ | ||
| TkTextIndex curIndex; | ||
| TkTextDispChunk *breakChunkPtr; /* Chunk containing best word break | ||
| * point, if any. */ | ||
| TkTextIndex breakIndex; /* Index of first character in | ||
| * breakChunkPtr. */ | ||
| int breakByteOffset; /* Byte offset of character within | ||
| * breakChunkPtr just to right of best | ||
| * break point. */ | ||
| int noCharsYet; /* Non-zero means that no characters | ||
| * have been placed on the line yet. */ | ||
| int justify; /* How to justify line: taken from | ||
| * style for the first character in | ||
| * line. */ | ||
| int jIndent; /* Additional indentation (beyond | ||
| * margins) due to justification. */ | ||
| int rMargin; /* Right margin width for line. */ | ||
| TkWrapMode wrapMode; /* Wrap mode to use for this line. */ | ||
| int x = 0, maxX = 0; /* Initializations needed only to | ||
| * stop compiler warnings. */ | ||
| int wholeLine; /* Non-zero means this display line | ||
| * runs to the end of the text line. */ | ||
| int tabIndex; /* Index of the current tab stop. */ | ||
| int gotTab; /* Non-zero means the current chunk | ||
| * contains a tab. */ | ||
| TkTextDispChunk *tabChunkPtr; /* Pointer to the chunk containing | ||
| * the previous tab stop. */ | ||
| int maxBytes; /* Maximum number of bytes to | ||
| * include in this chunk. */ | ||
| TkTextTabArray *tabArrayPtr; /* Tab stops for line; taken from | ||
| * style for the first character on | ||
| * line. */ | ||
| int tabSize; /* Number of pixels consumed by current | ||
| * tab stop. */ | ||
| TkTextDispChunk *lastCharChunkPtr; /* Pointer to last chunk in display | ||
| * lines with numBytes > 0. Used to | ||
| * drop 0-sized chunks from the end | ||
| * of the line. */ | ||
| int byteOffset, ascent, descent, code, elide, elidesize; | ||
| StyleValues *sValuePtr; | ||
| /* | ||
| * Create and initialize a new DLine structure. | ||
| */ | ||
| dlPtr = (DLine *) ckalloc(sizeof(DLine)); | ||
| dlPtr->index = *indexPtr; | ||
| dlPtr->byteCount = 0; | ||
| dlPtr->y = 0; | ||
| dlPtr->oldY = -1; | ||
| dlPtr->height = 0; | ||
| dlPtr->baseline = 0; | ||
| dlPtr->chunkPtr = NULL; | ||
| dlPtr->nextPtr = NULL; | ||
| dlPtr->flags = NEW_LAYOUT; | ||
| /* | ||
| * Special case entirely elide line as there may be 1000s or more | ||
| */ | ||
| elide = TkTextIsElided(textPtr, indexPtr); /* save a malloc */ | ||
| if (elide && indexPtr->byteIndex==0) { | ||
| maxBytes = 0; | ||
| for (segPtr = indexPtr->linePtr->segPtr; | ||
| elide && (segPtr != NULL); | ||
| segPtr = segPtr->nextPtr) { | ||
| if ((elidesize = segPtr->size) > 0) { | ||
| maxBytes += elidesize; | ||
| /* | ||
| * If have we have a tag toggle, there is a chance | ||
| * that invisibility state changed, so bail out | ||
| */ | ||
| } else if ((segPtr->typePtr == &tkTextToggleOffType) | ||
| || (segPtr->typePtr == &tkTextToggleOnType)) { | ||
| if (segPtr->body.toggle.tagPtr->elideString != NULL) { | ||
| elide = (segPtr->typePtr == &tkTextToggleOffType) | ||
| ^ segPtr->body.toggle.tagPtr->elide; | ||
| } | ||
| } | ||
| } | ||
| if (elide) { | ||
| dlPtr->byteCount = maxBytes; | ||
| dlPtr->spaceAbove = dlPtr->spaceBelow = dlPtr->length = 0; | ||
| return dlPtr; | ||
| } | ||
| } | ||
| /* | ||
| * Each iteration of the loop below creates one TkTextDispChunk for | ||
| * the new display line. The line will always have at least one | ||
| * chunk (for the newline character at the end, if there's nothing | ||
| * else available). | ||
| */ | ||
| curIndex = *indexPtr; | ||
| lastChunkPtr = NULL; | ||
| chunkPtr = NULL; | ||
| noCharsYet = 1; | ||
| elide = 0; | ||
| breakChunkPtr = NULL; | ||
| breakByteOffset = 0; | ||
| justify = TK_JUSTIFY_LEFT; | ||
| tabIndex = -1; | ||
| tabChunkPtr = NULL; | ||
| tabArrayPtr = NULL; | ||
| rMargin = 0; | ||
| wrapMode = TEXT_WRAPMODE_CHAR; | ||
| tabSize = 0; | ||
| lastCharChunkPtr = NULL; | ||
| /* | ||
| * Find the first segment to consider for the line. Can't call | ||
| * TkTextIndexToSeg for this because it won't return a segment | ||
| * with zero size (such as the insertion cursor's mark). | ||
| */ | ||
| for (byteOffset = curIndex.byteIndex, segPtr = curIndex.linePtr->segPtr; | ||
| (byteOffset > 0) && (byteOffset >= segPtr->size); | ||
| byteOffset -= segPtr->size, segPtr = segPtr->nextPtr) { | ||
| /* Empty loop body. */ | ||
| } | ||
| while (segPtr != NULL) { | ||
| /* | ||
| * Every line still gets at least one chunk due to expectations | ||
| * in the rest of the code, but we are able to skip elided portions | ||
| * of the line quickly. | ||
| * If current chunk is elided and last chunk was too, coalese | ||
| */ | ||
| if (elide && (lastChunkPtr != NULL) | ||
| && (lastChunkPtr->displayProc == NULL /*ElideDisplayProc*/)) { | ||
| if ((elidesize = segPtr->size - byteOffset) > 0) { | ||
| curIndex.byteIndex += elidesize; | ||
| lastChunkPtr->numBytes += elidesize; | ||
| breakByteOffset = lastChunkPtr->breakIndex = lastChunkPtr->numBytes; | ||
| /* | ||
| * If have we have a tag toggle, there is a chance | ||
| * that invisibility state changed, so bail out | ||
| */ | ||
| } else if ((segPtr->typePtr == &tkTextToggleOffType) | ||
| || (segPtr->typePtr == &tkTextToggleOnType)) { | ||
| if (segPtr->body.toggle.tagPtr->elideString != NULL) { | ||
| elide = (segPtr->typePtr == &tkTextToggleOffType) | ||
| ^ segPtr->body.toggle.tagPtr->elide; | ||
| } | ||
| } | ||
| byteOffset = 0; | ||
| segPtr = segPtr->nextPtr; | ||
| if (segPtr == NULL && chunkPtr != NULL) { | ||
| ckfree((char *) chunkPtr); | ||
| } | ||
| continue; | ||
| } | ||
| if (segPtr->typePtr->layoutProc == NULL) { | ||
| segPtr = segPtr->nextPtr; | ||
| byteOffset = 0; | ||
| continue; | ||
| } | ||
| if (chunkPtr == NULL) { | ||
| chunkPtr = (TkTextDispChunk *) ckalloc(sizeof(TkTextDispChunk)); | ||
| chunkPtr->nextPtr = NULL; | ||
| } | ||
| chunkPtr->stylePtr = GetStyle(textPtr, &curIndex); | ||
| elide = chunkPtr->stylePtr->sValuePtr->elide; | ||
| /* | ||
| * Save style information such as justification and indentation, | ||
| * up until the first character is encountered, then retain that | ||
| * information for the rest of the line. | ||
| */ | ||
| if (noCharsYet) { | ||
| tabArrayPtr = chunkPtr->stylePtr->sValuePtr->tabArrayPtr; | ||
| justify = chunkPtr->stylePtr->sValuePtr->justify; | ||
| rMargin = chunkPtr->stylePtr->sValuePtr->rMargin; | ||
| wrapMode = chunkPtr->stylePtr->sValuePtr->wrapMode; | ||
| x = ((curIndex.byteIndex == 0) | ||
| ? chunkPtr->stylePtr->sValuePtr->lMargin1 | ||
| : chunkPtr->stylePtr->sValuePtr->lMargin2); | ||
| if (wrapMode == TEXT_WRAPMODE_NONE) { | ||
| maxX = -1; | ||
| } else { | ||
| maxX = textPtr->dInfoPtr->maxX - textPtr->dInfoPtr->x | ||
| - rMargin; | ||
| if (maxX < x) { | ||
| maxX = x; | ||
| } | ||
| } | ||
| } | ||
| /* | ||
| * See if there is a tab in the current chunk; if so, only | ||
| * layout characters up to (and including) the tab. | ||
| */ | ||
| gotTab = 0; | ||
| maxBytes = segPtr->size - byteOffset; | ||
| if (!elide && justify == TK_JUSTIFY_LEFT) { | ||
| if (segPtr->typePtr == &tkTextCharType) { | ||
| char *p; | ||
| for (p = segPtr->body.chars + byteOffset; *p != 0; p++) { | ||
| if (*p == '\t') { | ||
| maxBytes = (p + 1 - segPtr->body.chars) - byteOffset; | ||
| gotTab = 1; | ||
| break; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| chunkPtr->x = x; | ||
| if (elide && maxBytes) { | ||
| /* don't free style here, as other code expects to be able to do that */ | ||
| /*breakByteOffset =*/ chunkPtr->breakIndex = chunkPtr->numBytes = maxBytes; | ||
| chunkPtr->width = 0; | ||
| chunkPtr->minAscent = chunkPtr->minDescent = chunkPtr->minHeight = 0; | ||
| /* would just like to point to canonical empty chunk */ | ||
| chunkPtr->displayProc = (Tk_ChunkDisplayProc *) NULL; | ||
| chunkPtr->undisplayProc = (Tk_ChunkUndisplayProc *) NULL; | ||
| chunkPtr->measureProc = ElideMeasureProc; | ||
| chunkPtr->bboxProc = ElideBboxProc; | ||
| code = 1; | ||
| } else | ||
| code = (*segPtr->typePtr->layoutProc)(textPtr, &curIndex, segPtr, | ||
| byteOffset, maxX-tabSize, maxBytes, noCharsYet, wrapMode, | ||
| chunkPtr); | ||
| if (code <= 0) { | ||
| FreeStyle(textPtr, chunkPtr->stylePtr); | ||
| if (code < 0) { | ||
| /* | ||
| * This segment doesn't wish to display itself (e.g. most | ||
| * marks). | ||
| */ | ||
| segPtr = segPtr->nextPtr; | ||
| byteOffset = 0; | ||
| continue; | ||
| } | ||
| /* | ||
| * No characters from this segment fit in the window: this | ||
| * means we're at the end of the display line. | ||
| */ | ||
| if (chunkPtr != NULL) { | ||
| ckfree((char *) chunkPtr); | ||
| } | ||
| break; | ||
| } | ||
| if (chunkPtr->numBytes > 0) { | ||
| noCharsYet = 0; | ||
| lastCharChunkPtr = chunkPtr; | ||
| } | ||
| if (lastChunkPtr == NULL) { | ||
| dlPtr->chunkPtr = chunkPtr; | ||
| } else { | ||
| lastChunkPtr->nextPtr = chunkPtr; | ||
| } | ||
| lastChunkPtr = chunkPtr; | ||
| x += chunkPtr->width; | ||
| if (chunkPtr->breakIndex > 0) { | ||
| breakByteOffset = chunkPtr->breakIndex; | ||
| breakIndex = curIndex; | ||
| breakChunkPtr = chunkPtr; | ||
| } | ||
| if (chunkPtr->numBytes != maxBytes) { | ||
| break; | ||
| } | ||
| /* | ||
| * If we're at a new tab, adjust the layout for all the chunks | ||
| * pertaining to the previous tab. Also adjust the amount of | ||
| * space left in the line to account for space that will be eaten | ||
| * up by the tab. | ||
| */ | ||
| if (gotTab) { | ||
| if (tabIndex >= 0) { | ||
| AdjustForTab(textPtr, tabArrayPtr, tabIndex, tabChunkPtr); | ||
| x = chunkPtr->x + chunkPtr->width; | ||
| } | ||
| tabIndex++; | ||
| tabChunkPtr = chunkPtr; | ||
| tabSize = SizeOfTab(textPtr, tabArrayPtr, tabIndex, x, maxX); | ||
| if ((maxX >= 0) && (tabSize >= maxX - x)) { | ||
| break; | ||
| } | ||
| } | ||
| curIndex.byteIndex += chunkPtr->numBytes; | ||
| byteOffset += chunkPtr->numBytes; | ||
| if (byteOffset >= segPtr->size) { | ||
| byteOffset = 0; | ||
| segPtr = segPtr->nextPtr; | ||
| } | ||
| chunkPtr = NULL; | ||
| } | ||
| if (noCharsYet) { | ||
| panic("LayoutDLine couldn't place any characters on a line"); | ||
| } | ||
| wholeLine = (segPtr == NULL); | ||
| /* | ||
| * We're at the end of the display line. Throw away everything | ||
| * after the most recent word break, if there is one; this may | ||
| * potentially require the last chunk to be layed out again. | ||
| */ | ||
| if (breakChunkPtr == NULL) { | ||
| /* | ||
| * This code makes sure that we don't accidentally display | ||
| * chunks with no characters at the end of the line (such as | ||
| * the insertion cursor). These chunks belong on the next | ||
| * line. So, throw away everything after the last chunk that | ||
| * has characters in it. | ||
| */ | ||
| breakChunkPtr = lastCharChunkPtr; | ||
| breakByteOffset = breakChunkPtr->numBytes; | ||
| } | ||
| if ((breakChunkPtr != NULL) && ((lastChunkPtr != breakChunkPtr) | ||
| || (breakByteOffset != lastChunkPtr->numBytes))) { | ||
| while (1) { | ||
| chunkPtr = breakChunkPtr->nextPtr; | ||
| if (chunkPtr == NULL) { | ||
| break; | ||
| } | ||
| FreeStyle(textPtr, chunkPtr->stylePtr); | ||
| breakChunkPtr->nextPtr = chunkPtr->nextPtr; | ||
| (*chunkPtr->undisplayProc)(textPtr, chunkPtr); | ||
| ckfree((char *) chunkPtr); | ||
| } | ||
| if (breakByteOffset != breakChunkPtr->numBytes) { | ||
| (*breakChunkPtr->undisplayProc)(textPtr, breakChunkPtr); | ||
| segPtr = TkTextIndexToSeg(&breakIndex, &byteOffset); | ||
| (*segPtr->typePtr->layoutProc)(textPtr, &breakIndex, | ||
| segPtr, byteOffset, maxX, breakByteOffset, 0, | ||
| wrapMode, breakChunkPtr); | ||
| } | ||
| lastChunkPtr = breakChunkPtr; | ||
| wholeLine = 0; | ||
| } | ||
| /* | ||
| * Make tab adjustments for the last tab stop, if there is one. | ||
| */ | ||
| if ((tabIndex >= 0) && (tabChunkPtr != NULL)) { | ||
| AdjustForTab(textPtr, tabArrayPtr, tabIndex, tabChunkPtr); | ||
| } | ||
| /* | ||
| * Make one more pass over the line to recompute various things | ||
| * like its height, length, and total number of bytes. Also | ||
| * modify the x-locations of chunks to reflect justification. | ||
| * If we're not wrapping, I'm not sure what is the best way to | ||
| * handle left and center justification: should the total length, | ||
| * for purposes of justification, be (a) the window width, (b) | ||
| * the length of the longest line in the window, or (c) the length | ||
| * of the longest line in the text? (c) isn't available, (b) seems | ||
| * weird, since it can change with vertical scrolling, so (a) is | ||
| * what is implemented below. | ||
| */ | ||
| if (wrapMode == TEXT_WRAPMODE_NONE) { | ||
| maxX = textPtr->dInfoPtr->maxX - textPtr->dInfoPtr->x - rMargin; | ||
| } | ||
| dlPtr->length = lastChunkPtr->x + lastChunkPtr->width; | ||
| if (justify == TK_JUSTIFY_LEFT) { | ||
| jIndent = 0; | ||
| } else if (justify == TK_JUSTIFY_RIGHT) { | ||
| jIndent = maxX - dlPtr->length; | ||
| } else { | ||
| jIndent = (maxX - dlPtr->length)/2; | ||
| } | ||
| ascent = descent = 0; | ||
| for (chunkPtr = dlPtr->chunkPtr; chunkPtr != NULL; | ||
| chunkPtr = chunkPtr->nextPtr) { | ||
| chunkPtr->x += jIndent; | ||
| dlPtr->byteCount += chunkPtr->numBytes; | ||
| if (chunkPtr->minAscent > ascent) { | ||
| ascent = chunkPtr->minAscent; | ||
| } | ||
| if (chunkPtr->minDescent > descent) { | ||
| descent = chunkPtr->minDescent; | ||
| } | ||
| if (chunkPtr->minHeight > dlPtr->height) { | ||
| dlPtr->height = chunkPtr->minHeight; | ||
| } | ||
| sValuePtr = chunkPtr->stylePtr->sValuePtr; | ||
| if ((sValuePtr->borderWidth > 0) | ||
| && (sValuePtr->relief != TK_RELIEF_FLAT)) { | ||
| dlPtr->flags |= HAS_3D_BORDER; | ||
| } | ||
| } | ||
| if (dlPtr->height < (ascent + descent)) { | ||
| dlPtr->height = ascent + descent; | ||
| dlPtr->baseline = ascent; | ||
| } else { | ||
| dlPtr->baseline = ascent + (dlPtr->height - ascent - descent)/2; | ||
| } | ||
| sValuePtr = dlPtr->chunkPtr->stylePtr->sValuePtr; | ||
| if (dlPtr->index.byteIndex == 0) { | ||
| dlPtr->spaceAbove = sValuePtr->spacing1; | ||
| } else { | ||
| dlPtr->spaceAbove = sValuePtr->spacing2 - sValuePtr->spacing2/2; | ||
| } | ||
| if (wholeLine) { | ||
| dlPtr->spaceBelow = sValuePtr->spacing3; | ||
| } else { | ||
| dlPtr->spaceBelow = sValuePtr->spacing2/2; | ||
| } | ||
| dlPtr->height += dlPtr->spaceAbove + dlPtr->spaceBelow; | ||
| dlPtr->baseline += dlPtr->spaceAbove; | ||
| /* | ||
| * Recompute line length: may have changed because of justification. | ||
| */ | ||
| dlPtr->length = lastChunkPtr->x + lastChunkPtr->width; | ||
| return dlPtr; | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * UpdateDisplayInfo -- | ||
| * | ||
| * This procedure is invoked to recompute some or all of the | ||
| * DLine structures for a text widget. At the time it is called | ||
| * the DLine structures still left in the widget are guaranteed | ||
| * to be correct except that (a) the y-coordinates aren't | ||
| * necessarily correct, (b) there may be missing structures | ||
| * (the DLine structures get removed as soon as they are potentially | ||
| * out-of-date), and (c) DLine structures that don't start at the | ||
| * beginning of a line may be incorrect if previous information in | ||
| * the same line changed size in a way that moved a line boundary | ||
| * (DLines for any info that changed will have been deleted, but | ||
| * not DLines for unchanged info in the same text line). | ||
| * | ||
| * Results: | ||
| * None. | ||
| * | ||
| * Side effects: | ||
| * Upon return, the DLine information for textPtr correctly reflects | ||
| * the positions where characters will be displayed. However, this | ||
| * procedure doesn't actually bring the display up-to-date. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| static void | ||
| UpdateDisplayInfo(textPtr) | ||
| TkText *textPtr; /* Text widget to update. */ | ||
| { | ||
| register TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| register DLine *dlPtr, *prevPtr; | ||
| TkTextIndex index; | ||
| TkTextLine *lastLinePtr; | ||
| int y, maxY, pixelOffset, maxOffset; | ||
| if (!(dInfoPtr->flags & DINFO_OUT_OF_DATE)) { | ||
| return; | ||
| } | ||
| dInfoPtr->flags &= ~DINFO_OUT_OF_DATE; | ||
| /* | ||
| * Delete any DLines that are now above the top of the window. | ||
| */ | ||
| index = textPtr->topIndex; | ||
| dlPtr = FindDLine(dInfoPtr->dLinePtr, &index); | ||
| if ((dlPtr != NULL) && (dlPtr != dInfoPtr->dLinePtr)) { | ||
| FreeDLines(textPtr, dInfoPtr->dLinePtr, dlPtr, 1); | ||
| } | ||
| /* | ||
| *-------------------------------------------------------------- | ||
| * Scan through the contents of the window from top to bottom, | ||
| * recomputing information for lines that are missing. | ||
| *-------------------------------------------------------------- | ||
| */ | ||
| lastLinePtr = TkBTreeFindLine(textPtr->tree, | ||
| TkBTreeNumLines(textPtr->tree)); | ||
| dlPtr = dInfoPtr->dLinePtr; | ||
| prevPtr = NULL; | ||
| y = dInfoPtr->y; | ||
| maxY = dInfoPtr->maxY; | ||
| while (1) { | ||
| register DLine *newPtr; | ||
| if (index.linePtr == lastLinePtr) { | ||
| break; | ||
| } | ||
| /* | ||
| * There are three possibilities right now: | ||
| * (a) the next DLine (dlPtr) corresponds exactly to the next | ||
| * information we want to display: just use it as-is. | ||
| * (b) the next DLine corresponds to a different line, or to | ||
| * a segment that will be coming later in the same line: | ||
| * leave this DLine alone in the hopes that we'll be able | ||
| * to use it later, then create a new DLine in front of | ||
| * it. | ||
| * (c) the next DLine corresponds to a segment in the line we | ||
| * want, but it's a segment that has already been processed | ||
| * or will never be processed. Delete the DLine and try | ||
| * again. | ||
| * | ||
| * One other twist on all this. It's possible for 3D borders | ||
| * to interact between lines (see DisplayLineBackground) so if | ||
| * a line is relayed out and has styles with 3D borders, its | ||
| * neighbors have to be redrawn if they have 3D borders too, | ||
| * since the interactions could have changed (the neighbors | ||
| * don't have to be relayed out, just redrawn). | ||
| */ | ||
| if ((dlPtr == NULL) || (dlPtr->index.linePtr != index.linePtr)) { | ||
| /* | ||
| * Case (b) -- must make new DLine. | ||
| */ | ||
| makeNewDLine: | ||
| if (tkTextDebug) { | ||
| char string[TK_POS_CHARS]; | ||
| /* | ||
| * Debugging is enabled, so keep a log of all the lines | ||
| * that were re-layed out. The test suite uses this | ||
| * information. | ||
| */ | ||
| TkTextPrintIndex(&index, string); | ||
| Tcl_SetVar2(textPtr->interp, "tk_textRelayout", (char *) NULL, | ||
| string, | ||
| TCL_GLOBAL_ONLY|TCL_APPEND_VALUE|TCL_LIST_ELEMENT); | ||
| } | ||
| newPtr = LayoutDLine(textPtr, &index); | ||
| if (prevPtr == NULL) { | ||
| dInfoPtr->dLinePtr = newPtr; | ||
| } else { | ||
| prevPtr->nextPtr = newPtr; | ||
| if (prevPtr->flags & HAS_3D_BORDER) { | ||
| prevPtr->oldY = -1; | ||
| } | ||
| } | ||
| newPtr->nextPtr = dlPtr; | ||
| dlPtr = newPtr; | ||
| } else { | ||
| /* | ||
| * DlPtr refers to the line we want. Next check the | ||
| * index within the line. | ||
| */ | ||
| if (index.byteIndex == dlPtr->index.byteIndex) { | ||
| /* | ||
| * Case (a) -- can use existing display line as-is. | ||
| */ | ||
| if ((dlPtr->flags & HAS_3D_BORDER) && (prevPtr != NULL) | ||
| && (prevPtr->flags & (NEW_LAYOUT))) { | ||
| dlPtr->oldY = -1; | ||
| } | ||
| goto lineOK; | ||
| } | ||
| if (index.byteIndex < dlPtr->index.byteIndex) { | ||
| goto makeNewDLine; | ||
| } | ||
| /* | ||
| * Case (c) -- dlPtr is useless. Discard it and start | ||
| * again with the next display line. | ||
| */ | ||
| newPtr = dlPtr->nextPtr; | ||
| FreeDLines(textPtr, dlPtr, newPtr, 0); | ||
| dlPtr = newPtr; | ||
| if (prevPtr != NULL) { | ||
| prevPtr->nextPtr = newPtr; | ||
| } else { | ||
| dInfoPtr->dLinePtr = newPtr; | ||
| } | ||
| continue; | ||
| } | ||
| /* | ||
| * Advance to the start of the next line. | ||
| */ | ||
| lineOK: | ||
| dlPtr->y = y; | ||
| y += dlPtr->height; | ||
| TkTextIndexForwBytes(&index, dlPtr->byteCount, &index); | ||
| prevPtr = dlPtr; | ||
| dlPtr = dlPtr->nextPtr; | ||
| /* | ||
| * If we switched text lines, delete any DLines left for the | ||
| * old text line. | ||
| */ | ||
| if (index.linePtr != prevPtr->index.linePtr) { | ||
| register DLine *nextPtr; | ||
| nextPtr = dlPtr; | ||
| while ((nextPtr != NULL) | ||
| && (nextPtr->index.linePtr == prevPtr->index.linePtr)) { | ||
| nextPtr = nextPtr->nextPtr; | ||
| } | ||
| if (nextPtr != dlPtr) { | ||
| FreeDLines(textPtr, dlPtr, nextPtr, 0); | ||
| prevPtr->nextPtr = nextPtr; | ||
| dlPtr = nextPtr; | ||
| } | ||
| } | ||
| /* | ||
| * It's important to have the following check here rather than in | ||
| * the while statement for the loop, so that there's always at least | ||
| * one DLine generated, regardless of how small the window is. This | ||
| * keeps a lot of other code from breaking. | ||
| */ | ||
| if (y >= maxY) { | ||
| break; | ||
| } | ||
| } | ||
| /* | ||
| * Delete any DLine structures that don't fit on the screen. | ||
| */ | ||
| FreeDLines(textPtr, dlPtr, (DLine *) NULL, 1); | ||
| /* | ||
| *-------------------------------------------------------------- | ||
| * If there is extra space at the bottom of the window (because | ||
| * we've hit the end of the text), then bring in more lines at | ||
| * the top of the window, if there are any, to fill in the view. | ||
| *-------------------------------------------------------------- | ||
| */ | ||
| if (y < maxY) { | ||
| int lineNum, spaceLeft, bytesToCount; | ||
| DLine *lowestPtr; | ||
| /* | ||
| * Layout an entire text line (potentially > 1 display line), | ||
| * then link in as many display lines as fit without moving | ||
| * the bottom line out of the window. Repeat this until | ||
| * all the extra space has been used up or we've reached the | ||
| * beginning of the text. | ||
| */ | ||
| spaceLeft = maxY - y; | ||
| lineNum = TkBTreeLineIndex(dInfoPtr->dLinePtr->index.linePtr); | ||
| bytesToCount = dInfoPtr->dLinePtr->index.byteIndex; | ||
| if (bytesToCount == 0) { | ||
| bytesToCount = INT_MAX; | ||
| lineNum--; | ||
| } | ||
| for ( ; (lineNum >= 0) && (spaceLeft > 0); lineNum--) { | ||
| index.linePtr = TkBTreeFindLine(textPtr->tree, lineNum); | ||
| index.byteIndex = 0; | ||
| lowestPtr = NULL; | ||
| do { | ||
| dlPtr = LayoutDLine(textPtr, &index); | ||
| dlPtr->nextPtr = lowestPtr; | ||
| lowestPtr = dlPtr; | ||
| if (dlPtr->length == 0 && dlPtr->height == 0) { bytesToCount--; break; } /* elide */ | ||
| TkTextIndexForwBytes(&index, dlPtr->byteCount, &index); | ||
| bytesToCount -= dlPtr->byteCount; | ||
| } while ((bytesToCount > 0) | ||
| && (index.linePtr == lowestPtr->index.linePtr)); | ||
| /* | ||
| * Scan through the display lines from the bottom one up to | ||
| * the top one. | ||
| */ | ||
| while (lowestPtr != NULL) { | ||
| dlPtr = lowestPtr; | ||
| spaceLeft -= dlPtr->height; | ||
| if (spaceLeft < 0) { | ||
| break; | ||
| } | ||
| lowestPtr = dlPtr->nextPtr; | ||
| dlPtr->nextPtr = dInfoPtr->dLinePtr; | ||
| dInfoPtr->dLinePtr = dlPtr; | ||
| if (tkTextDebug) { | ||
| char string[TK_POS_CHARS]; | ||
| TkTextPrintIndex(&dlPtr->index, string); | ||
| Tcl_SetVar2(textPtr->interp, "tk_textRelayout", | ||
| (char *) NULL, string, | ||
| TCL_GLOBAL_ONLY|TCL_APPEND_VALUE|TCL_LIST_ELEMENT); | ||
| } | ||
| } | ||
| FreeDLines(textPtr, lowestPtr, (DLine *) NULL, 0); | ||
| bytesToCount = INT_MAX; | ||
| } | ||
| /* | ||
| * Now we're all done except that the y-coordinates in all the | ||
| * DLines are wrong and the top index for the text is wrong. | ||
| * Update them. | ||
| */ | ||
| textPtr->topIndex = dInfoPtr->dLinePtr->index; | ||
| y = dInfoPtr->y; | ||
| for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL; | ||
| dlPtr = dlPtr->nextPtr) { | ||
| if (y > dInfoPtr->maxY) { | ||
| panic("Added too many new lines in UpdateDisplayInfo"); | ||
| } | ||
| dlPtr->y = y; | ||
| y += dlPtr->height; | ||
| } | ||
| } | ||
| /* | ||
| *-------------------------------------------------------------- | ||
| * If the old top or bottom line has scrolled elsewhere on the | ||
| * screen, we may not be able to re-use its old contents by | ||
| * copying bits (e.g., a beveled edge that was drawn when it was | ||
| * at the top or bottom won't be drawn when the line is in the | ||
| * middle and its neighbor has a matching background). Similarly, | ||
| * if the new top or bottom line came from somewhere else on the | ||
| * screen, we may not be able to copy the old bits. | ||
| *-------------------------------------------------------------- | ||
| */ | ||
| dlPtr = dInfoPtr->dLinePtr; | ||
| if ((dlPtr->flags & HAS_3D_BORDER) && !(dlPtr->flags & TOP_LINE)) { | ||
| dlPtr->oldY = -1; | ||
| } | ||
| while (1) { | ||
| if ((dlPtr->flags & TOP_LINE) && (dlPtr != dInfoPtr->dLinePtr) | ||
| && (dlPtr->flags & HAS_3D_BORDER)) { | ||
| dlPtr->oldY = -1; | ||
| } | ||
| if ((dlPtr->flags & BOTTOM_LINE) && (dlPtr->nextPtr != NULL) | ||
| && (dlPtr->flags & HAS_3D_BORDER)) { | ||
| dlPtr->oldY = -1; | ||
| } | ||
| if (dlPtr->nextPtr == NULL) { | ||
| if ((dlPtr->flags & HAS_3D_BORDER) | ||
| && !(dlPtr->flags & BOTTOM_LINE)) { | ||
| dlPtr->oldY = -1; | ||
| } | ||
| dlPtr->flags &= ~TOP_LINE; | ||
| dlPtr->flags |= BOTTOM_LINE; | ||
| break; | ||
| } | ||
| dlPtr->flags &= ~(TOP_LINE|BOTTOM_LINE); | ||
| dlPtr = dlPtr->nextPtr; | ||
| } | ||
| dInfoPtr->dLinePtr->flags |= TOP_LINE; | ||
| /* | ||
| * Arrange for scrollbars to be updated. | ||
| */ | ||
| textPtr->flags |= UPDATE_SCROLLBARS; | ||
| /* | ||
| *-------------------------------------------------------------- | ||
| * Deal with horizontal scrolling: | ||
| * 1. If there's empty space to the right of the longest line, | ||
| * shift the screen to the right to fill in the empty space. | ||
| * 2. If the desired horizontal scroll position has changed, | ||
| * force a full redisplay of all the lines in the widget. | ||
| * 3. If the wrap mode isn't "none" then re-scroll to the base | ||
| * position. | ||
| *-------------------------------------------------------------- | ||
| */ | ||
| dInfoPtr->maxLength = 0; | ||
| for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL; | ||
| dlPtr = dlPtr->nextPtr) { | ||
| if (dlPtr->length > dInfoPtr->maxLength) { | ||
| dInfoPtr->maxLength = dlPtr->length; | ||
| } | ||
| } | ||
| maxOffset = (dInfoPtr->maxLength - (dInfoPtr->maxX - dInfoPtr->x) | ||
| + textPtr->charWidth - 1)/textPtr->charWidth; | ||
| if (dInfoPtr->newByteOffset > maxOffset) { | ||
| dInfoPtr->newByteOffset = maxOffset; | ||
| } | ||
| if (dInfoPtr->newByteOffset < 0) { | ||
| dInfoPtr->newByteOffset = 0; | ||
| } | ||
| pixelOffset = dInfoPtr->newByteOffset * textPtr->charWidth; | ||
| if (pixelOffset != dInfoPtr->curPixelOffset) { | ||
| dInfoPtr->curPixelOffset = pixelOffset; | ||
| for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL; | ||
| dlPtr = dlPtr->nextPtr) { | ||
| dlPtr->oldY = -1; | ||
| } | ||
| } | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * FreeDLines -- | ||
| * | ||
| * This procedure is called to free up all of the resources | ||
| * associated with one or more DLine structures. | ||
| * | ||
| * Results: | ||
| * None. | ||
| * | ||
| * Side effects: | ||
| * Memory gets freed and various other resources are released. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| static void | ||
| FreeDLines(textPtr, firstPtr, lastPtr, unlink) | ||
| TkText *textPtr; /* Information about overall text | ||
| * widget. */ | ||
| register DLine *firstPtr; /* Pointer to first DLine to free up. */ | ||
| DLine *lastPtr; /* Pointer to DLine just after last | ||
| * one to free (NULL means everything | ||
| * starting with firstPtr). */ | ||
| int unlink; /* 1 means DLines are currently linked | ||
| * into the list rooted at | ||
| * textPtr->dInfoPtr->dLinePtr and | ||
| * they have to be unlinked. 0 means | ||
| * just free without unlinking. */ | ||
| { | ||
| register TkTextDispChunk *chunkPtr, *nextChunkPtr; | ||
| register DLine *nextDLinePtr; | ||
| if (unlink) { | ||
| if (textPtr->dInfoPtr->dLinePtr == firstPtr) { | ||
| textPtr->dInfoPtr->dLinePtr = lastPtr; | ||
| } else { | ||
| register DLine *prevPtr; | ||
| for (prevPtr = textPtr->dInfoPtr->dLinePtr; | ||
| prevPtr->nextPtr != firstPtr; prevPtr = prevPtr->nextPtr) { | ||
| /* Empty loop body. */ | ||
| } | ||
| prevPtr->nextPtr = lastPtr; | ||
| } | ||
| } | ||
| while (firstPtr != lastPtr) { | ||
| nextDLinePtr = firstPtr->nextPtr; | ||
| for (chunkPtr = firstPtr->chunkPtr; chunkPtr != NULL; | ||
| chunkPtr = nextChunkPtr) { | ||
| if (chunkPtr->undisplayProc != NULL) { | ||
| (*chunkPtr->undisplayProc)(textPtr, chunkPtr); | ||
| } | ||
| FreeStyle(textPtr, chunkPtr->stylePtr); | ||
| nextChunkPtr = chunkPtr->nextPtr; | ||
| ckfree((char *) chunkPtr); | ||
| } | ||
| ckfree((char *) firstPtr); | ||
| firstPtr = nextDLinePtr; | ||
| } | ||
| textPtr->dInfoPtr->dLinesInvalidated = 1; | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * DisplayDLine -- | ||
| * | ||
| * This procedure is invoked to draw a single line on the | ||
| * screen. | ||
| * | ||
| * Results: | ||
| * None. | ||
| * | ||
| * Side effects: | ||
| * The line given by dlPtr is drawn at its correct position in | ||
| * textPtr's window. Note that this is one *display* line, not | ||
| * one *text* line. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| static void | ||
| DisplayDLine(textPtr, dlPtr, prevPtr, pixmap) | ||
| TkText *textPtr; /* Text widget in which to draw line. */ | ||
| register DLine *dlPtr; /* Information about line to draw. */ | ||
| DLine *prevPtr; /* Line just before one to draw, or NULL | ||
| * if dlPtr is the top line. */ | ||
| Pixmap pixmap; /* Pixmap to use for double-buffering. | ||
| * Caller must make sure it's large enough | ||
| * to hold line. */ | ||
| { | ||
| register TkTextDispChunk *chunkPtr; | ||
| TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| Display *display; | ||
| int height, x; | ||
| if (dlPtr->chunkPtr == NULL) return; | ||
| /* | ||
| * First, clear the area of the line to the background color for the | ||
| * text widget. | ||
| */ | ||
| display = Tk_Display(textPtr->tkwin); | ||
| Tk_Fill3DRectangle(textPtr->tkwin, pixmap, textPtr->border, 0, 0, | ||
| Tk_Width(textPtr->tkwin), dlPtr->height, 0, TK_RELIEF_FLAT); | ||
| /* | ||
| * Next, draw background information for the whole line. | ||
| */ | ||
| DisplayLineBackground(textPtr, dlPtr, prevPtr, pixmap); | ||
| /* | ||
| * Make another pass through all of the chunks to redraw the | ||
| * insertion cursor, if it is visible on this line. Must do | ||
| * it here rather than in the foreground pass below because | ||
| * otherwise a wide insertion cursor will obscure the character | ||
| * to its left. | ||
| */ | ||
| if (textPtr->state == TK_STATE_NORMAL) { | ||
| for (chunkPtr = dlPtr->chunkPtr; (chunkPtr != NULL); | ||
| chunkPtr = chunkPtr->nextPtr) { | ||
| x = chunkPtr->x + dInfoPtr->x - dInfoPtr->curPixelOffset; | ||
| if (chunkPtr->displayProc == TkTextInsertDisplayProc) { | ||
| (*chunkPtr->displayProc)(chunkPtr, x, dlPtr->spaceAbove, | ||
| dlPtr->height - dlPtr->spaceAbove - dlPtr->spaceBelow, | ||
| dlPtr->baseline - dlPtr->spaceAbove, display, pixmap, | ||
| dlPtr->y + dlPtr->spaceAbove); | ||
| } | ||
| } | ||
| } | ||
| /* | ||
| * Make yet another pass through all of the chunks to redraw all of | ||
| * foreground information. Note: we have to call the displayProc | ||
| * even for chunks that are off-screen. This is needed, for | ||
| * example, so that embedded windows can be unmapped in this case. | ||
| * Conve | ||
| */ | ||
| for (chunkPtr = dlPtr->chunkPtr; (chunkPtr != NULL); | ||
| chunkPtr = chunkPtr->nextPtr) { | ||
| if (chunkPtr->displayProc == TkTextInsertDisplayProc) { | ||
| /* | ||
| * Already displayed the insertion cursor above. Don't | ||
| * do it again here. | ||
| */ | ||
| continue; | ||
| } | ||
| x = chunkPtr->x + dInfoPtr->x - dInfoPtr->curPixelOffset; | ||
| if ((x + chunkPtr->width <= 0) || (x >= dInfoPtr->maxX)) { | ||
| /* | ||
| * Note: we have to call the displayProc even for chunks | ||
| * that are off-screen. This is needed, for example, so | ||
| * that embedded windows can be unmapped in this case. | ||
| * Display the chunk at a coordinate that can be clearly | ||
| * identified by the displayProc as being off-screen to | ||
| * the left (the displayProc may not be able to tell if | ||
| * something is off to the right). | ||
| */ | ||
| if (chunkPtr->displayProc != NULL) | ||
| (*chunkPtr->displayProc)(chunkPtr, -chunkPtr->width, | ||
| dlPtr->spaceAbove, | ||
| dlPtr->height - dlPtr->spaceAbove - dlPtr->spaceBelow, | ||
| dlPtr->baseline - dlPtr->spaceAbove, display, pixmap, | ||
| dlPtr->y + dlPtr->spaceAbove); | ||
| } else { | ||
| /* don't call if elide. This tax ok since not very many visible DLine's in | ||
| an area, but potentially many elide ones */ | ||
| if (chunkPtr->displayProc != NULL) | ||
| (*chunkPtr->displayProc)(chunkPtr, x, dlPtr->spaceAbove, | ||
| dlPtr->height - dlPtr->spaceAbove - dlPtr->spaceBelow, | ||
| dlPtr->baseline - dlPtr->spaceAbove, display, pixmap, | ||
| dlPtr->y + dlPtr->spaceAbove); | ||
| } | ||
| if (dInfoPtr->dLinesInvalidated) { | ||
| return; | ||
| } | ||
| } | ||
| /* | ||
| * Copy the pixmap onto the screen. If this is the last line on | ||
| * the screen then copy a piece of the line, so that it doesn't | ||
| * overflow into the border area. Another special trick: copy the | ||
| * padding area to the left of the line; this is because the | ||
| * insertion cursor sometimes overflows onto that area and we want | ||
| * to get as much of the cursor as possible. | ||
| */ | ||
| height = dlPtr->height; | ||
| if ((height + dlPtr->y) > dInfoPtr->maxY) { | ||
| height = dInfoPtr->maxY - dlPtr->y; | ||
| } | ||
| XCopyArea(display, pixmap, Tk_WindowId(textPtr->tkwin), dInfoPtr->copyGC, | ||
| dInfoPtr->x, 0, (unsigned) (dInfoPtr->maxX - dInfoPtr->x), | ||
| (unsigned) height, dInfoPtr->x, dlPtr->y); | ||
| linesRedrawn++; | ||
| } | ||
| /* | ||
| *-------------------------------------------------------------- | ||
| * | ||
| * DisplayLineBackground -- | ||
| * | ||
| * This procedure is called to fill in the background for | ||
| * a display line. It draws 3D borders cleverly so that | ||
| * adjacent chunks with the same style (whether on the same | ||
| * line or different lines) have a single 3D border around | ||
| * the whole region. | ||
| * | ||
| * Results: | ||
| * There is no return value. Pixmap is filled in with background | ||
| * information for dlPtr. | ||
| * | ||
| * Side effects: | ||
| * None. | ||
| * | ||
| *-------------------------------------------------------------- | ||
| */ | ||
| static void | ||
| DisplayLineBackground(textPtr, dlPtr, prevPtr, pixmap) | ||
| TkText *textPtr; /* Text widget containing line. */ | ||
| register DLine *dlPtr; /* Information about line to draw. */ | ||
| DLine *prevPtr; /* Line just above dlPtr, or NULL if dlPtr | ||
| * is the top-most line in the window. */ | ||
| Pixmap pixmap; /* Pixmap to use for double-buffering. | ||
| * Caller must make sure it's large enough | ||
| * to hold line. Caller must also have | ||
| * filled it with the background color for | ||
| * the widget. */ | ||
| { | ||
| TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| TkTextDispChunk *chunkPtr; /* Pointer to chunk in the current line. */ | ||
| TkTextDispChunk *chunkPtr2; /* Pointer to chunk in the line above or | ||
| * below the current one. NULL if we're to | ||
| * the left of or to the right of the chunks | ||
| * in the line. */ | ||
| TkTextDispChunk *nextPtr2; /* Next chunk after chunkPtr2 (it's not the | ||
| * same as chunkPtr2->nextPtr in the case | ||
| * where chunkPtr2 is NULL because the line | ||
| * is indented). */ | ||
| int leftX; /* The left edge of the region we're | ||
| * currently working on. */ | ||
| int leftXIn; /* 1 means beveled edge at leftX slopes right | ||
| * as it goes down, 0 means it slopes left | ||
| * as it goes down. */ | ||
| int rightX; /* Right edge of chunkPtr. */ | ||
| int rightX2; /* Right edge of chunkPtr2. */ | ||
| int matchLeft; /* Does the style of this line match that | ||
| * of its neighbor just to the left of | ||
| * the current x coordinate? */ | ||
| int matchRight; /* Does line's style match its neighbor | ||
| * just to the right of the current x-coord? */ | ||
| int minX, maxX, xOffset; | ||
| StyleValues *sValuePtr; | ||
| Display *display; | ||
| /* | ||
| * Pass 1: scan through dlPtr from left to right. For each range of | ||
| * chunks with the same style, draw the main background for the style | ||
| * plus the vertical parts of the 3D borders (the left and right | ||
| * edges). | ||
| */ | ||
| display = Tk_Display(textPtr->tkwin); | ||
| minX = dInfoPtr->curPixelOffset; | ||
| xOffset = dInfoPtr->x - minX; | ||
| maxX = minX + dInfoPtr->maxX - dInfoPtr->x; | ||
| chunkPtr = dlPtr->chunkPtr; | ||
| /* | ||
| * Note A: in the following statement, and a few others later in | ||
| * this file marked with "See Note A above", the right side of the | ||
| * assignment was replaced with 0 on 6/18/97. This has the effect | ||
| * of highlighting the empty space to the left of a line whenever | ||
| * the leftmost character of the line is highlighted. This way, | ||
| * multi-line highlights always line up along their left edges. | ||
| * However, this may look funny in the case where a single word is | ||
| * highlighted. To undo the change, replace "leftX = 0" with "leftX | ||
| * = chunkPtr->x" and "rightX2 = 0" with "rightX2 = nextPtr2->x" | ||
| * here and at all the marked points below. This restores the old | ||
| * behavior where empty space to the left of a line is not | ||
| * highlighted, leaving a ragged left edge for multi-line | ||
| * highlights. | ||
| */ | ||
| leftX = 0; | ||
| for (; leftX < maxX; chunkPtr = chunkPtr->nextPtr) { | ||
| if ((chunkPtr->nextPtr != NULL) | ||
| && SAME_BACKGROUND(chunkPtr->nextPtr->stylePtr, | ||
| chunkPtr->stylePtr)) { | ||
| continue; | ||
| } | ||
| sValuePtr = chunkPtr->stylePtr->sValuePtr; | ||
| rightX = chunkPtr->x + chunkPtr->width; | ||
| if ((chunkPtr->nextPtr == NULL) && (rightX < maxX)) { | ||
| rightX = maxX; | ||
| } | ||
| if (chunkPtr->stylePtr->bgGC != None) { | ||
| XFillRectangle(display, pixmap, chunkPtr->stylePtr->bgGC, | ||
| leftX + xOffset, 0, (unsigned int) (rightX - leftX), | ||
| (unsigned int) dlPtr->height); | ||
| if (sValuePtr->relief != TK_RELIEF_FLAT) { | ||
| Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border, | ||
| leftX + xOffset, 0, sValuePtr->borderWidth, | ||
| dlPtr->height, 1, sValuePtr->relief); | ||
| Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border, | ||
| rightX - sValuePtr->borderWidth + xOffset, | ||
| 0, sValuePtr->borderWidth, dlPtr->height, 0, | ||
| sValuePtr->relief); | ||
| } | ||
| } | ||
| leftX = rightX; | ||
| } | ||
| /* | ||
| * Pass 2: draw the horizontal bevels along the top of the line. To | ||
| * do this, scan through dlPtr from left to right while simultaneously | ||
| * scanning through the line just above dlPtr. ChunkPtr2 and nextPtr2 | ||
| * refer to two adjacent chunks in the line above. | ||
| */ | ||
| chunkPtr = dlPtr->chunkPtr; | ||
| leftX = 0; /* See Note A above. */ | ||
| leftXIn = 1; | ||
| rightX = chunkPtr->x + chunkPtr->width; | ||
| if ((chunkPtr->nextPtr == NULL) && (rightX < maxX)) { | ||
| rightX = maxX; | ||
| } | ||
| chunkPtr2 = NULL; | ||
| if (prevPtr != NULL && prevPtr->chunkPtr != NULL) { | ||
| /* | ||
| * Find the chunk in the previous line that covers leftX. | ||
| */ | ||
| nextPtr2 = prevPtr->chunkPtr; | ||
| rightX2 = 0; /* See Note A above. */ | ||
| while (rightX2 <= leftX) { | ||
| chunkPtr2 = nextPtr2; | ||
| if (chunkPtr2 == NULL) { | ||
| break; | ||
| } | ||
| nextPtr2 = chunkPtr2->nextPtr; | ||
| rightX2 = chunkPtr2->x + chunkPtr2->width; | ||
| if (nextPtr2 == NULL) { | ||
| rightX2 = INT_MAX; | ||
| } | ||
| } | ||
| } else { | ||
| nextPtr2 = NULL; | ||
| rightX2 = INT_MAX; | ||
| } | ||
| while (leftX < maxX) { | ||
| matchLeft = (chunkPtr2 != NULL) | ||
| && SAME_BACKGROUND(chunkPtr2->stylePtr, chunkPtr->stylePtr); | ||
| sValuePtr = chunkPtr->stylePtr->sValuePtr; | ||
| if (rightX <= rightX2) { | ||
| /* | ||
| * The chunk in our line is about to end. If its style | ||
| * changes then draw the bevel for the current style. | ||
| */ | ||
| if ((chunkPtr->nextPtr == NULL) | ||
| || !SAME_BACKGROUND(chunkPtr->stylePtr, | ||
| chunkPtr->nextPtr->stylePtr)) { | ||
| if (!matchLeft && (sValuePtr->relief != TK_RELIEF_FLAT)) { | ||
| Tk_3DHorizontalBevel(textPtr->tkwin, pixmap, | ||
| sValuePtr->border, leftX + xOffset, 0, | ||
| rightX - leftX, sValuePtr->borderWidth, leftXIn, | ||
| 1, 1, sValuePtr->relief); | ||
| } | ||
| leftX = rightX; | ||
| leftXIn = 1; | ||
| /* | ||
| * If the chunk in the line above is also ending at | ||
| * the same point then advance to the next chunk in | ||
| * that line. | ||
| */ | ||
| if ((rightX == rightX2) && (chunkPtr2 != NULL)) { | ||
| goto nextChunk2; | ||
| } | ||
| } | ||
| chunkPtr = chunkPtr->nextPtr; | ||
| if (chunkPtr == NULL) { | ||
| break; | ||
| } | ||
| rightX = chunkPtr->x + chunkPtr->width; | ||
| if ((chunkPtr->nextPtr == NULL) && (rightX < maxX)) { | ||
| rightX = maxX; | ||
| } | ||
| continue; | ||
| } | ||
| /* | ||
| * The chunk in the line above is ending at an x-position where | ||
| * there is no change in the style of the current line. If the | ||
| * style above matches the current line on one side of the change | ||
| * but not on the other, we have to draw an L-shaped piece of | ||
| * bevel. | ||
| */ | ||
| matchRight = (nextPtr2 != NULL) | ||
| && SAME_BACKGROUND(nextPtr2->stylePtr, chunkPtr->stylePtr); | ||
| if (matchLeft && !matchRight) { | ||
| if (sValuePtr->relief != TK_RELIEF_FLAT) { | ||
| Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border, | ||
| rightX2 - sValuePtr->borderWidth + xOffset, 0, | ||
| sValuePtr->borderWidth, sValuePtr->borderWidth, 0, | ||
| sValuePtr->relief); | ||
| } | ||
| leftX = rightX2 - sValuePtr->borderWidth; | ||
| leftXIn = 0; | ||
| } else if (!matchLeft && matchRight | ||
| && (sValuePtr->relief != TK_RELIEF_FLAT)) { | ||
| Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border, | ||
| rightX2 + xOffset, 0, sValuePtr->borderWidth, | ||
| sValuePtr->borderWidth, 1, sValuePtr->relief); | ||
| Tk_3DHorizontalBevel(textPtr->tkwin, pixmap, sValuePtr->border, | ||
| leftX + xOffset, 0, rightX2 + sValuePtr->borderWidth -leftX, | ||
| sValuePtr->borderWidth, leftXIn, 0, 1, | ||
| sValuePtr->relief); | ||
| } | ||
| nextChunk2: | ||
| chunkPtr2 = nextPtr2; | ||
| if (chunkPtr2 == NULL) { | ||
| rightX2 = INT_MAX; | ||
| } else { | ||
| nextPtr2 = chunkPtr2->nextPtr; | ||
| rightX2 = chunkPtr2->x + chunkPtr2->width; | ||
| if (nextPtr2 == NULL) { | ||
| rightX2 = INT_MAX; | ||
| } | ||
| } | ||
| } | ||
| /* | ||
| * Pass 3: draw the horizontal bevels along the bottom of the line. | ||
| * This uses the same approach as pass 2. | ||
| */ | ||
| chunkPtr = dlPtr->chunkPtr; | ||
| leftX = 0; /* See Note A above. */ | ||
| leftXIn = 0; | ||
| rightX = chunkPtr->x + chunkPtr->width; | ||
| if ((chunkPtr->nextPtr == NULL) && (rightX < maxX)) { | ||
| rightX = maxX; | ||
| } | ||
| chunkPtr2 = NULL; | ||
| if (dlPtr->nextPtr != NULL && dlPtr->nextPtr->chunkPtr != NULL) { | ||
| /* | ||
| * Find the chunk in the previous line that covers leftX. | ||
| */ | ||
| nextPtr2 = dlPtr->nextPtr->chunkPtr; | ||
| rightX2 = 0; /* See Note A above. */ | ||
| while (rightX2 <= leftX) { | ||
| chunkPtr2 = nextPtr2; | ||
| if (chunkPtr2 == NULL) { | ||
| break; | ||
| } | ||
| nextPtr2 = chunkPtr2->nextPtr; | ||
| rightX2 = chunkPtr2->x + chunkPtr2->width; | ||
| if (nextPtr2 == NULL) { | ||
| rightX2 = INT_MAX; | ||
| } | ||
| } | ||
| } else { | ||
| nextPtr2 = NULL; | ||
| rightX2 = INT_MAX; | ||
| } | ||
| while (leftX < maxX) { | ||
| matchLeft = (chunkPtr2 != NULL) | ||
| && SAME_BACKGROUND(chunkPtr2->stylePtr, chunkPtr->stylePtr); | ||
| sValuePtr = chunkPtr->stylePtr->sValuePtr; | ||
| if (rightX <= rightX2) { | ||
| if ((chunkPtr->nextPtr == NULL) | ||
| || !SAME_BACKGROUND(chunkPtr->stylePtr, | ||
| chunkPtr->nextPtr->stylePtr)) { | ||
| if (!matchLeft && (sValuePtr->relief != TK_RELIEF_FLAT)) { | ||
| Tk_3DHorizontalBevel(textPtr->tkwin, pixmap, | ||
| sValuePtr->border, leftX + xOffset, | ||
| dlPtr->height - sValuePtr->borderWidth, | ||
| rightX - leftX, sValuePtr->borderWidth, leftXIn, | ||
| 0, 0, sValuePtr->relief); | ||
| } | ||
| leftX = rightX; | ||
| leftXIn = 0; | ||
| if ((rightX == rightX2) && (chunkPtr2 != NULL)) { | ||
| goto nextChunk2b; | ||
| } | ||
| } | ||
| chunkPtr = chunkPtr->nextPtr; | ||
| if (chunkPtr == NULL) { | ||
| break; | ||
| } | ||
| rightX = chunkPtr->x + chunkPtr->width; | ||
| if ((chunkPtr->nextPtr == NULL) && (rightX < maxX)) { | ||
| rightX = maxX; | ||
| } | ||
| continue; | ||
| } | ||
| matchRight = (nextPtr2 != NULL) | ||
| && SAME_BACKGROUND(nextPtr2->stylePtr, chunkPtr->stylePtr); | ||
| if (matchLeft && !matchRight) { | ||
| if (sValuePtr->relief != TK_RELIEF_FLAT) { | ||
| Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border, | ||
| rightX2 - sValuePtr->borderWidth + xOffset, | ||
| dlPtr->height - sValuePtr->borderWidth, | ||
| sValuePtr->borderWidth, sValuePtr->borderWidth, 0, | ||
| sValuePtr->relief); | ||
| } | ||
| leftX = rightX2 - sValuePtr->borderWidth; | ||
| leftXIn = 1; | ||
| } else if (!matchLeft && matchRight | ||
| && (sValuePtr->relief != TK_RELIEF_FLAT)) { | ||
| Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border, | ||
| rightX2 + xOffset, dlPtr->height - sValuePtr->borderWidth, | ||
| sValuePtr->borderWidth, sValuePtr->borderWidth, | ||
| 1, sValuePtr->relief); | ||
| Tk_3DHorizontalBevel(textPtr->tkwin, pixmap, sValuePtr->border, | ||
| leftX + xOffset, dlPtr->height - sValuePtr->borderWidth, | ||
| rightX2 + sValuePtr->borderWidth - leftX, | ||
| sValuePtr->borderWidth, leftXIn, 1, 0, sValuePtr->relief); | ||
| } | ||
| nextChunk2b: | ||
| chunkPtr2 = nextPtr2; | ||
| if (chunkPtr2 == NULL) { | ||
| rightX2 = INT_MAX; | ||
| } else { | ||
| nextPtr2 = chunkPtr2->nextPtr; | ||
| rightX2 = chunkPtr2->x + chunkPtr2->width; | ||
| if (nextPtr2 == NULL) { | ||
| rightX2 = INT_MAX; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * DisplayText -- | ||
| * | ||
| * This procedure is invoked as a when-idle handler to update the | ||
| * display. It only redisplays the parts of the text widget that | ||
| * are out of date. | ||
| * | ||
| * Results: | ||
| * None. | ||
| * | ||
| * Side effects: | ||
| * Information is redrawn on the screen. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| static void | ||
| DisplayText(clientData) | ||
| ClientData clientData; /* Information about widget. */ | ||
| { | ||
| register TkText *textPtr = (TkText *) clientData; | ||
| TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| Tk_Window tkwin; | ||
| register DLine *dlPtr; | ||
| DLine *prevPtr; | ||
| Pixmap pixmap; | ||
| int maxHeight, borders; | ||
| int bottomY = 0; /* Initialization needed only to stop | ||
| * compiler warnings. */ | ||
| Tcl_Interp *interp; | ||
| if (textPtr->tkwin == NULL) { | ||
| /* | ||
| * The widget has been deleted. Don't do anything. | ||
| */ | ||
| return; | ||
| } | ||
| interp = textPtr->interp; | ||
| Tcl_Preserve((ClientData) interp); | ||
| if (tkTextDebug) { | ||
| Tcl_SetVar2(interp, "tk_textRelayout", (char *) NULL, "", | ||
| TCL_GLOBAL_ONLY); | ||
| } | ||
| if (textPtr->tkwin == NULL) { | ||
| /* | ||
| * The widget has been deleted. Don't do anything. | ||
| */ | ||
| goto end; | ||
| } | ||
| if (!Tk_IsMapped(textPtr->tkwin) || (dInfoPtr->maxX <= dInfoPtr->x) | ||
| || (dInfoPtr->maxY <= dInfoPtr->y)) { | ||
| UpdateDisplayInfo(textPtr); | ||
| dInfoPtr->flags &= ~REDRAW_PENDING; | ||
| goto doScrollbars; | ||
| } | ||
| numRedisplays++; | ||
| if (tkTextDebug) { | ||
| Tcl_SetVar2(interp, "tk_textRedraw", (char *) NULL, "", | ||
| TCL_GLOBAL_ONLY); | ||
| } | ||
| if (textPtr->tkwin == NULL) { | ||
| /* | ||
| * The widget has been deleted. Don't do anything. | ||
| */ | ||
| goto end; | ||
| } | ||
| /* | ||
| * Choose a new current item if that is needed (this could cause | ||
| * event handlers to be invoked, hence the preserve/release calls | ||
| * and the loop, since the handlers could conceivably necessitate | ||
| * yet another current item calculation). The tkwin check is because | ||
| * the whole window could go away in the Tcl_Release call. | ||
| */ | ||
| while (dInfoPtr->flags & REPICK_NEEDED) { | ||
| Tcl_Preserve((ClientData) textPtr); | ||
| dInfoPtr->flags &= ~REPICK_NEEDED; | ||
| TkTextPickCurrent(textPtr, &textPtr->pickEvent); | ||
| tkwin = textPtr->tkwin; | ||
| Tcl_Release((ClientData) textPtr); | ||
| if (tkwin == NULL) { | ||
| goto end; | ||
| } | ||
| } | ||
| /* | ||
| * First recompute what's supposed to be displayed. | ||
| */ | ||
| UpdateDisplayInfo(textPtr); | ||
| dInfoPtr->dLinesInvalidated = 0; | ||
| /* | ||
| * See if it's possible to bring some parts of the screen up-to-date | ||
| * by scrolling (copying from other parts of the screen). | ||
| */ | ||
| for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL; dlPtr = dlPtr->nextPtr) { | ||
| register DLine *dlPtr2; | ||
| int offset, height, y, oldY; | ||
| TkRegion damageRgn; | ||
| if ((dlPtr->oldY == -1) || (dlPtr->y == dlPtr->oldY) | ||
| || ((dlPtr->oldY + dlPtr->height) > dInfoPtr->maxY)) { | ||
| continue; | ||
| } | ||
| /* | ||
| * This line is already drawn somewhere in the window so it only | ||
| * needs to be copied to its new location. See if there's a group | ||
| * of lines that can all be copied together. | ||
| */ | ||
| offset = dlPtr->y - dlPtr->oldY; | ||
| height = dlPtr->height; | ||
| y = dlPtr->y; | ||
| for (dlPtr2 = dlPtr->nextPtr; dlPtr2 != NULL; | ||
| dlPtr2 = dlPtr2->nextPtr) { | ||
| if ((dlPtr2->oldY == -1) | ||
| || ((dlPtr2->oldY + offset) != dlPtr2->y) | ||
| || ((dlPtr2->oldY + dlPtr2->height) > dInfoPtr->maxY)) { | ||
| break; | ||
| } | ||
| height += dlPtr2->height; | ||
| } | ||
| /* | ||
| * Reduce the height of the area being copied if necessary to | ||
| * avoid overwriting the border area. | ||
| */ | ||
| if ((y + height) > dInfoPtr->maxY) { | ||
| height = dInfoPtr->maxY -y; | ||
| } | ||
| oldY = dlPtr->oldY; | ||
| /* | ||
| * Update the lines we are going to scroll to show that they | ||
| * have been copied. | ||
| */ | ||
| while (1) { | ||
| dlPtr->oldY = dlPtr->y; | ||
| if (dlPtr->nextPtr == dlPtr2) { | ||
| break; | ||
| } | ||
| dlPtr = dlPtr->nextPtr; | ||
| } | ||
| /* | ||
| * Scan through the lines following the copied ones to see if | ||
| * we are going to overwrite them with the copy operation. | ||
| * If so, mark them for redisplay. | ||
| */ | ||
| for ( ; dlPtr2 != NULL; dlPtr2 = dlPtr2->nextPtr) { | ||
| if ((dlPtr2->oldY != -1) | ||
| && ((dlPtr2->oldY + dlPtr2->height) > y) | ||
| && (dlPtr2->oldY < (y + height))) { | ||
| dlPtr2->oldY = -1; | ||
| } | ||
| } | ||
| /* | ||
| * Now scroll the lines. This may generate damage which we | ||
| * handle by calling TextInvalidateRegion to mark the display | ||
| * blocks as stale. | ||
| */ | ||
| damageRgn = TkCreateRegion(); | ||
| if (TkScrollWindow(textPtr->tkwin, dInfoPtr->scrollGC, | ||
| dInfoPtr->x, oldY, | ||
| (dInfoPtr->maxX - dInfoPtr->x), height, | ||
| 0, y - oldY, damageRgn)) { | ||
| TextInvalidateRegion(textPtr, damageRgn); | ||
| } | ||
| numCopies++; | ||
| TkDestroyRegion(damageRgn); | ||
| } | ||
| /* | ||
| * Clear the REDRAW_PENDING flag here. This is actually pretty | ||
| * tricky. We want to wait until *after* doing the scrolling, | ||
| * since that could generate more areas to redraw and don't | ||
| * want to reschedule a redisplay for them. On the other hand, | ||
| * we can't wait until after all the redisplaying, because the | ||
| * act of redisplaying could actually generate more redisplays | ||
| * (e.g. in the case of a nested window with event bindings triggered | ||
| * by redisplay). | ||
| */ | ||
| dInfoPtr->flags &= ~REDRAW_PENDING; | ||
| /* | ||
| * Redraw the borders if that's needed. | ||
| */ | ||
| if (dInfoPtr->flags & REDRAW_BORDERS) { | ||
| if (tkTextDebug) { | ||
| Tcl_SetVar2(interp, "tk_textRedraw", (char *) NULL, "borders", | ||
| TCL_GLOBAL_ONLY|TCL_APPEND_VALUE|TCL_LIST_ELEMENT); | ||
| } | ||
| if (textPtr->tkwin == NULL) { | ||
| /* | ||
| * The widget has been deleted. Don't do anything. | ||
| */ | ||
| goto end; | ||
| } | ||
| Tk_Draw3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin), | ||
| textPtr->border, textPtr->highlightWidth, | ||
| textPtr->highlightWidth, | ||
| Tk_Width(textPtr->tkwin) - 2*textPtr->highlightWidth, | ||
| Tk_Height(textPtr->tkwin) - 2*textPtr->highlightWidth, | ||
| textPtr->borderWidth, textPtr->relief); | ||
| if (textPtr->highlightWidth != 0) { | ||
| GC fgGC, bgGC; | ||
| bgGC = Tk_GCForColor(textPtr->highlightBgColorPtr, | ||
| Tk_WindowId(textPtr->tkwin)); | ||
| if (textPtr->flags & GOT_FOCUS) { | ||
| fgGC = Tk_GCForColor(textPtr->highlightColorPtr, | ||
| Tk_WindowId(textPtr->tkwin)); | ||
| TkpDrawHighlightBorder(textPtr->tkwin, fgGC, bgGC, | ||
| textPtr->highlightWidth, Tk_WindowId(textPtr->tkwin)); | ||
| } else { | ||
| TkpDrawHighlightBorder(textPtr->tkwin, bgGC, bgGC, | ||
| textPtr->highlightWidth, Tk_WindowId(textPtr->tkwin)); | ||
| } | ||
| } | ||
| borders = textPtr->borderWidth + textPtr->highlightWidth; | ||
| if (textPtr->padY > 0) { | ||
| Tk_Fill3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin), | ||
| textPtr->border, borders, borders, | ||
| Tk_Width(textPtr->tkwin) - 2*borders, textPtr->padY, | ||
| 0, TK_RELIEF_FLAT); | ||
| Tk_Fill3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin), | ||
| textPtr->border, borders, | ||
| Tk_Height(textPtr->tkwin) - borders - textPtr->padY, | ||
| Tk_Width(textPtr->tkwin) - 2*borders, | ||
| textPtr->padY, 0, TK_RELIEF_FLAT); | ||
| } | ||
| if (textPtr->padX > 0) { | ||
| Tk_Fill3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin), | ||
| textPtr->border, borders, borders + textPtr->padY, | ||
| textPtr->padX, | ||
| Tk_Height(textPtr->tkwin) - 2*borders -2*textPtr->padY, | ||
| 0, TK_RELIEF_FLAT); | ||
| Tk_Fill3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin), | ||
| textPtr->border, | ||
| Tk_Width(textPtr->tkwin) - borders - textPtr->padX, | ||
| borders + textPtr->padY, textPtr->padX, | ||
| Tk_Height(textPtr->tkwin) - 2*borders -2*textPtr->padY, | ||
| 0, TK_RELIEF_FLAT); | ||
| } | ||
| dInfoPtr->flags &= ~REDRAW_BORDERS; | ||
| } | ||
| /* | ||
| * Now we have to redraw the lines that couldn't be updated by | ||
| * scrolling. First, compute the height of the largest line and | ||
| * allocate an off-screen pixmap to use for double-buffered | ||
| * displays. | ||
| */ | ||
| maxHeight = -1; | ||
| for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL; | ||
| dlPtr = dlPtr->nextPtr) { | ||
| if ((dlPtr->height > maxHeight) && (dlPtr->oldY != dlPtr->y)) { | ||
| maxHeight = dlPtr->height; | ||
| } | ||
| bottomY = dlPtr->y + dlPtr->height; | ||
| } | ||
| if (maxHeight > dInfoPtr->maxY) { | ||
| maxHeight = dInfoPtr->maxY; | ||
| } | ||
| if (maxHeight > 0) { | ||
| pixmap = Tk_GetPixmap(Tk_Display(textPtr->tkwin), | ||
| Tk_WindowId(textPtr->tkwin), Tk_Width(textPtr->tkwin), | ||
| maxHeight, Tk_Depth(textPtr->tkwin)); | ||
| for (prevPtr = NULL, dlPtr = textPtr->dInfoPtr->dLinePtr; | ||
| (dlPtr != NULL) && (dlPtr->y < dInfoPtr->maxY); | ||
| prevPtr = dlPtr, dlPtr = dlPtr->nextPtr) { | ||
| if (dlPtr->chunkPtr == NULL) continue; | ||
| if (dlPtr->oldY != dlPtr->y) { | ||
| if (tkTextDebug) { | ||
| char string[TK_POS_CHARS]; | ||
| TkTextPrintIndex(&dlPtr->index, string); | ||
| Tcl_SetVar2(textPtr->interp, "tk_textRedraw", | ||
| (char *) NULL, string, | ||
| TCL_GLOBAL_ONLY|TCL_APPEND_VALUE|TCL_LIST_ELEMENT); | ||
| } | ||
| DisplayDLine(textPtr, dlPtr, prevPtr, pixmap); | ||
| if (dInfoPtr->dLinesInvalidated) { | ||
| Tk_FreePixmap(Tk_Display(textPtr->tkwin), pixmap); | ||
| return; | ||
| } | ||
| dlPtr->oldY = dlPtr->y; | ||
| dlPtr->flags &= ~NEW_LAYOUT; | ||
| } | ||
| /*prevPtr = dlPtr;*/ | ||
| } | ||
| Tk_FreePixmap(Tk_Display(textPtr->tkwin), pixmap); | ||
| } | ||
| /* | ||
| * See if we need to refresh the part of the window below the | ||
| * last line of text (if there is any such area). Refresh the | ||
| * padding area on the left too, since the insertion cursor might | ||
| * have been displayed there previously). | ||
| */ | ||
| if (dInfoPtr->topOfEof > dInfoPtr->maxY) { | ||
| dInfoPtr->topOfEof = dInfoPtr->maxY; | ||
| } | ||
| if (bottomY < dInfoPtr->topOfEof) { | ||
| if (tkTextDebug) { | ||
| Tcl_SetVar2(textPtr->interp, "tk_textRedraw", | ||
| (char *) NULL, "eof", | ||
| TCL_GLOBAL_ONLY|TCL_APPEND_VALUE|TCL_LIST_ELEMENT); | ||
| } | ||
| if (textPtr->tkwin == NULL) { | ||
| /* | ||
| * The widget has been deleted. Don't do anything. | ||
| */ | ||
| goto end; | ||
| } | ||
| Tk_Fill3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin), | ||
| textPtr->border, dInfoPtr->x - textPtr->padX, bottomY, | ||
| dInfoPtr->maxX - (dInfoPtr->x - textPtr->padX), | ||
| dInfoPtr->topOfEof-bottomY, 0, TK_RELIEF_FLAT); | ||
| } | ||
| dInfoPtr->topOfEof = bottomY; | ||
| doScrollbars: | ||
| /* | ||
| * Update the vertical scrollbar, if there is one. Note: it's | ||
| * important to clear REDRAW_PENDING here, just in case the | ||
| * scroll procedure does something that requires redisplay. | ||
| */ | ||
| if (textPtr->flags & UPDATE_SCROLLBARS) { | ||
| textPtr->flags &= ~UPDATE_SCROLLBARS; | ||
| if (textPtr->yScrollCmd != NULL) { | ||
| GetYView(textPtr->interp, textPtr, 1); | ||
| } | ||
| if (textPtr->tkwin == NULL) { | ||
| /* | ||
| * The widget has been deleted. Don't do anything. | ||
| */ | ||
| goto end; | ||
| } | ||
| /* | ||
| * Update the horizontal scrollbar, if any. | ||
| */ | ||
| if (textPtr->xScrollCmd != NULL) { | ||
| GetXView(textPtr->interp, textPtr, 1); | ||
| } | ||
| } | ||
| end: | ||
| Tcl_Release((ClientData) interp); | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * TkTextEventuallyRepick -- | ||
| * | ||
| * This procedure is invoked whenever something happens that | ||
| * could change the current character or the tags associated | ||
| * with it. | ||
| * | ||
| * Results: | ||
| * None. | ||
| * | ||
| * Side effects: | ||
| * A repick is scheduled as an idle handler. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| /* ARGSUSED */ | ||
| void | ||
| TkTextEventuallyRepick(textPtr) | ||
| TkText *textPtr; /* Widget record for text widget. */ | ||
| { | ||
| TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| dInfoPtr->flags |= REPICK_NEEDED; | ||
| if (!(dInfoPtr->flags & REDRAW_PENDING)) { | ||
| dInfoPtr->flags |= REDRAW_PENDING; | ||
| Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr); | ||
| } | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * TkTextRedrawRegion -- | ||
| * | ||
| * This procedure is invoked to schedule a redisplay for a given | ||
| * region of a text widget. The redisplay itself may not occur | ||
| * immediately: it's scheduled as a when-idle handler. | ||
| * | ||
| * Results: | ||
| * None. | ||
| * | ||
| * Side effects: | ||
| * Information will eventually be redrawn on the screen. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| /* ARGSUSED */ | ||
| void | ||
| TkTextRedrawRegion(textPtr, x, y, width, height) | ||
| TkText *textPtr; /* Widget record for text widget. */ | ||
| int x, y; /* Coordinates of upper-left corner of area | ||
| * to be redrawn, in pixels relative to | ||
| * textPtr's window. */ | ||
| int width, height; /* Width and height of area to be redrawn. */ | ||
| { | ||
| TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| TkRegion damageRgn = TkCreateRegion(); | ||
| XRectangle rect; | ||
| rect.x = x; | ||
| rect.y = y; | ||
| rect.width = width; | ||
| rect.height = height; | ||
| TkUnionRectWithRegion(&rect, damageRgn, damageRgn); | ||
| TextInvalidateRegion(textPtr, damageRgn); | ||
| if (!(dInfoPtr->flags & REDRAW_PENDING)) { | ||
| dInfoPtr->flags |= REDRAW_PENDING; | ||
| Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr); | ||
| } | ||
| TkDestroyRegion(damageRgn); | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * TextInvalidateRegion -- | ||
| * | ||
| * Mark a region of text as invalid. | ||
| * | ||
| * Results: | ||
| * None. | ||
| * | ||
| * Side effects: | ||
| * Updates the display information for the text widget. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| static void | ||
| TextInvalidateRegion(textPtr, region) | ||
| TkText *textPtr; /* Widget record for text widget. */ | ||
| TkRegion region; /* Region of area to redraw. */ | ||
| { | ||
| register DLine *dlPtr; | ||
| TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| int maxY, inset; | ||
| XRectangle rect; | ||
| /* | ||
| * Find all lines that overlap the given region and mark them for | ||
| * redisplay. | ||
| */ | ||
| TkClipBox(region, &rect); | ||
| maxY = rect.y + rect.height; | ||
| for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL; | ||
| dlPtr = dlPtr->nextPtr) { | ||
| if ((dlPtr->oldY != -1) && (TkRectInRegion(region, rect.x, dlPtr->y, | ||
| rect.width, (unsigned int) dlPtr->height) != RectangleOut)) { | ||
| dlPtr->oldY = -1; | ||
| } | ||
| } | ||
| if (dInfoPtr->topOfEof < maxY) { | ||
| dInfoPtr->topOfEof = maxY; | ||
| } | ||
| /* | ||
| * Schedule the redisplay operation if there isn't one already | ||
| * scheduled. | ||
| */ | ||
| inset = textPtr->borderWidth + textPtr->highlightWidth; | ||
| if ((rect.x < (inset + textPtr->padX)) | ||
| || (rect.y < (inset + textPtr->padY)) | ||
| || ((int) (rect.x + rect.width) > (Tk_Width(textPtr->tkwin) | ||
| - inset - textPtr->padX)) | ||
| || (maxY > (Tk_Height(textPtr->tkwin) - inset - textPtr->padY))) { | ||
| dInfoPtr->flags |= REDRAW_BORDERS; | ||
| } | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * TkTextChanged -- | ||
| * | ||
| * This procedure is invoked when info in a text widget is about | ||
| * to be modified in a way that changes how it is displayed (e.g. | ||
| * characters were inserted or deleted, or tag information was | ||
| * changed). This procedure must be called *before* a change is | ||
| * made, so that indexes in the display information are still | ||
| * valid. | ||
| * | ||
| * Results: | ||
| * None. | ||
| * | ||
| * Side effects: | ||
| * The range of character between index1Ptr (inclusive) and | ||
| * index2Ptr (exclusive) will be redisplayed at some point in the | ||
| * future (the actual redisplay is scheduled as a when-idle handler). | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| void | ||
| TkTextChanged(textPtr, index1Ptr, index2Ptr) | ||
| TkText *textPtr; /* Widget record for text widget. */ | ||
| TkTextIndex *index1Ptr; /* Index of first character to redisplay. */ | ||
| TkTextIndex *index2Ptr; /* Index of character just after last one | ||
| * to redisplay. */ | ||
| { | ||
| TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| DLine *firstPtr, *lastPtr; | ||
| TkTextIndex rounded; | ||
| /* | ||
| * Schedule both a redisplay and a recomputation of display information. | ||
| * It's done here rather than the end of the procedure for two reasons: | ||
| * | ||
| * 1. If there are no display lines to update we'll want to return | ||
| * immediately, well before the end of the procedure. | ||
| * 2. It's important to arrange for the redisplay BEFORE calling | ||
| * FreeDLines. The reason for this is subtle and has to do with | ||
| * embedded windows. The chunk delete procedure for an embedded | ||
| * window will schedule an idle handler to unmap the window. | ||
| * However, we want the idle handler for redisplay to be called | ||
| * first, so that it can put the embedded window back on the screen | ||
| * again (if appropriate). This will prevent the window from ever | ||
| * being unmapped, and thereby avoid flashing. | ||
| */ | ||
| if (!(dInfoPtr->flags & REDRAW_PENDING)) { | ||
| Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr); | ||
| } | ||
| dInfoPtr->flags |= REDRAW_PENDING|DINFO_OUT_OF_DATE|REPICK_NEEDED; | ||
| /* | ||
| * Find the DLines corresponding to index1Ptr and index2Ptr. There | ||
| * is one tricky thing here, which is that we have to relayout in | ||
| * units of whole text lines: round index1Ptr back to the beginning | ||
| * of its text line, and include all the display lines after index2, | ||
| * up to the end of its text line. This is necessary because the | ||
| * indices stored in the display lines will no longer be valid. It's | ||
| * also needed because any edit could change the way lines wrap. | ||
| */ | ||
| rounded = *index1Ptr; | ||
| rounded.byteIndex = 0; | ||
| firstPtr = FindDLine(dInfoPtr->dLinePtr, &rounded); | ||
| if (firstPtr == NULL) { | ||
| return; | ||
| } | ||
| lastPtr = FindDLine(dInfoPtr->dLinePtr, index2Ptr); | ||
| while ((lastPtr != NULL) | ||
| && (lastPtr->index.linePtr == index2Ptr->linePtr)) { | ||
| lastPtr = lastPtr->nextPtr; | ||
| } | ||
| /* | ||
| * Delete all the DLines from firstPtr up to but not including lastPtr. | ||
| */ | ||
| FreeDLines(textPtr, firstPtr, lastPtr, 1); | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * TkTextRedrawTag -- | ||
| * | ||
| * This procedure is invoked to request a redraw of all characters | ||
| * in a given range that have a particular tag on or off. It's | ||
| * called, for example, when tag options change. | ||
| * | ||
| * Results: | ||
| * None. | ||
| * | ||
| * Side effects: | ||
| * Information on the screen may be redrawn, and the layout of | ||
| * the screen may change. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| void | ||
| TkTextRedrawTag(textPtr, index1Ptr, index2Ptr, tagPtr, withTag) | ||
| TkText *textPtr; /* Widget record for text widget. */ | ||
| TkTextIndex *index1Ptr; /* First character in range to consider | ||
| * for redisplay. NULL means start at | ||
| * beginning of text. */ | ||
| TkTextIndex *index2Ptr; /* Character just after last one to consider | ||
| * for redisplay. NULL means process all | ||
| * the characters in the text. */ | ||
| TkTextTag *tagPtr; /* Information about tag. */ | ||
| int withTag; /* 1 means redraw characters that have the | ||
| * tag, 0 means redraw those without. */ | ||
| { | ||
| register DLine *dlPtr; | ||
| DLine *endPtr; | ||
| int tagOn; | ||
| TkTextSearch search; | ||
| TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| TkTextIndex *curIndexPtr; | ||
| TkTextIndex endOfText, *endIndexPtr; | ||
| /* | ||
| * Round up the starting position if it's before the first line | ||
| * visible on the screen (we only care about what's on the screen). | ||
| */ | ||
| dlPtr = dInfoPtr->dLinePtr; | ||
| if (dlPtr == NULL) { | ||
| return; | ||
| } | ||
| if ((index1Ptr == NULL) || (TkTextIndexCmp(&dlPtr->index, index1Ptr) > 0)) { | ||
| index1Ptr = &dlPtr->index; | ||
| } | ||
| /* | ||
| * Set the stopping position if it wasn't specified. | ||
| */ | ||
| if (index2Ptr == NULL) { | ||
| index2Ptr = TkTextMakeByteIndex(textPtr->tree, | ||
| TkBTreeNumLines(textPtr->tree), 0, &endOfText); | ||
| } | ||
| /* | ||
| * Initialize a search through all transitions on the tag, starting | ||
| * with the first transition where the tag's current state is different | ||
| * from what it will eventually be. | ||
| */ | ||
| TkBTreeStartSearch(index1Ptr, index2Ptr, tagPtr, &search); | ||
| /* | ||
| * Make our own curIndex because at this point search.curIndex | ||
| * may not equal index1Ptr->curIndex in the case the first tag toggle | ||
| * comes after index1Ptr (See the use of FindTagStart in TkBTreeStartSearch) | ||
| */ | ||
| curIndexPtr = index1Ptr; | ||
| tagOn = TkBTreeCharTagged(index1Ptr, tagPtr); | ||
| if (tagOn != withTag) { | ||
| if (!TkBTreeNextTag(&search)) { | ||
| return; | ||
| } | ||
| curIndexPtr = &search.curIndex; | ||
| } | ||
| /* | ||
| * Schedule a redisplay and layout recalculation if they aren't | ||
| * already pending. This has to be done before calling FreeDLines, | ||
| * for the reason given in TkTextChanged. | ||
| */ | ||
| if (!(dInfoPtr->flags & REDRAW_PENDING)) { | ||
| Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr); | ||
| } | ||
| dInfoPtr->flags |= REDRAW_PENDING|DINFO_OUT_OF_DATE|REPICK_NEEDED; | ||
| /* | ||
| * Each loop through the loop below is for one range of characters | ||
| * where the tag's current state is different than its eventual | ||
| * state. At the top of the loop, search contains information about | ||
| * the first character in the range. | ||
| */ | ||
| while (1) { | ||
| /* | ||
| * Find the first DLine structure in the range. Note: if the | ||
| * desired character isn't the first in its text line, then look | ||
| * for the character just before it instead. This is needed to | ||
| * handle the case where the first character of a wrapped | ||
| * display line just got smaller, so that it now fits on the | ||
| * line before: need to relayout the line containing the | ||
| * previous character. | ||
| */ | ||
| if (curIndexPtr->byteIndex == 0) { | ||
| dlPtr = FindDLine(dlPtr, curIndexPtr); | ||
| } else { | ||
| TkTextIndex tmp; | ||
| tmp = *curIndexPtr; | ||
| tmp.byteIndex -= 1; | ||
| dlPtr = FindDLine(dlPtr, &tmp); | ||
| } | ||
| if (dlPtr == NULL) { | ||
| break; | ||
| } | ||
| /* | ||
| * Find the first DLine structure that's past the end of the range. | ||
| */ | ||
| if (!TkBTreeNextTag(&search)) { | ||
| endIndexPtr = index2Ptr; | ||
| } else { | ||
| curIndexPtr = &search.curIndex; | ||
| endIndexPtr = curIndexPtr; | ||
| } | ||
| endPtr = FindDLine(dlPtr, endIndexPtr); | ||
| if ((endPtr != NULL) && (endPtr->index.linePtr == endIndexPtr->linePtr) | ||
| && (endPtr->index.byteIndex < endIndexPtr->byteIndex)) { | ||
| endPtr = endPtr->nextPtr; | ||
| } | ||
| /* | ||
| * Delete all of the display lines in the range, so that they'll | ||
| * be re-layed out and redrawn. | ||
| */ | ||
| FreeDLines(textPtr, dlPtr, endPtr, 1); | ||
| dlPtr = endPtr; | ||
| /* | ||
| * Find the first text line in the next range. | ||
| */ | ||
| if (!TkBTreeNextTag(&search)) { | ||
| break; | ||
| } | ||
| } | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * TkTextRelayoutWindow -- | ||
| * | ||
| * This procedure is called when something has happened that | ||
| * invalidates the whole layout of characters on the screen, such | ||
| * as a change in a configuration option for the overall text | ||
| * widget or a change in the window size. It causes all display | ||
| * information to be recomputed and the window to be redrawn. | ||
| * | ||
| * Results: | ||
| * None. | ||
| * | ||
| * Side effects: | ||
| * All the display information will be recomputed for the window | ||
| * and the window will be redrawn. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| void | ||
| TkTextRelayoutWindow(textPtr) | ||
| TkText *textPtr; /* Widget record for text widget. */ | ||
| { | ||
| TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| GC new; | ||
| XGCValues gcValues; | ||
| /* | ||
| * Schedule the window redisplay. See TkTextChanged for the | ||
| * reason why this has to be done before any calls to FreeDLines. | ||
| */ | ||
| if (!(dInfoPtr->flags & REDRAW_PENDING)) { | ||
| Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr); | ||
| } | ||
| dInfoPtr->flags |= REDRAW_PENDING|REDRAW_BORDERS|DINFO_OUT_OF_DATE | ||
| |REPICK_NEEDED; | ||
| /* | ||
| * (Re-)create the graphics context for drawing the traversal | ||
| * highlight. | ||
| */ | ||
| gcValues.graphics_exposures = False; | ||
| new = Tk_GetGC(textPtr->tkwin, GCGraphicsExposures, &gcValues); | ||
| if (dInfoPtr->copyGC != None) { | ||
| Tk_FreeGC(textPtr->display, dInfoPtr->copyGC); | ||
| } | ||
| dInfoPtr->copyGC = new; | ||
| /* | ||
| * Throw away all the current layout information. | ||
| */ | ||
| FreeDLines(textPtr, dInfoPtr->dLinePtr, (DLine *) NULL, 1); | ||
| dInfoPtr->dLinePtr = NULL; | ||
| /* | ||
| * Recompute some overall things for the layout. Even if the | ||
| * window gets very small, pretend that there's at least one | ||
| * pixel of drawing space in it. | ||
| */ | ||
| if (textPtr->highlightWidth < 0) { | ||
| textPtr->highlightWidth = 0; | ||
| } | ||
| dInfoPtr->x = textPtr->highlightWidth + textPtr->borderWidth | ||
| + textPtr->padX; | ||
| dInfoPtr->y = textPtr->highlightWidth + textPtr->borderWidth | ||
| + textPtr->padY; | ||
| dInfoPtr->maxX = Tk_Width(textPtr->tkwin) - textPtr->highlightWidth | ||
| - textPtr->borderWidth - textPtr->padX; | ||
| if (dInfoPtr->maxX <= dInfoPtr->x) { | ||
| dInfoPtr->maxX = dInfoPtr->x + 1; | ||
| } | ||
| dInfoPtr->maxY = Tk_Height(textPtr->tkwin) - textPtr->highlightWidth | ||
| - textPtr->borderWidth - textPtr->padY; | ||
| if (dInfoPtr->maxY <= dInfoPtr->y) { | ||
| dInfoPtr->maxY = dInfoPtr->y + 1; | ||
| } | ||
| dInfoPtr->topOfEof = dInfoPtr->maxY; | ||
| /* | ||
| * If the upper-left character isn't the first in a line, recompute | ||
| * it. This is necessary because a change in the window's size | ||
| * or options could change the way lines wrap. | ||
| */ | ||
| if (textPtr->topIndex.byteIndex != 0) { | ||
| MeasureUp(textPtr, &textPtr->topIndex, 0, &textPtr->topIndex); | ||
| } | ||
| /* | ||
| * Invalidate cached scrollbar positions, so that scrollbars | ||
| * sliders will be udpated. | ||
| */ | ||
| dInfoPtr->xScrollFirst = dInfoPtr->xScrollLast = -1; | ||
| dInfoPtr->yScrollFirst = dInfoPtr->yScrollLast = -1; | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * TkTextSetYView -- | ||
| * | ||
| * This procedure is called to specify what lines are to be | ||
| * displayed in a text widget. | ||
| * | ||
| * Results: | ||
| * None. | ||
| * | ||
| * Side effects: | ||
| * The display will (eventually) be updated so that the position | ||
| * given by "indexPtr" is visible on the screen at the position | ||
| * determined by "pickPlace". | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| void | ||
| TkTextSetYView(textPtr, indexPtr, pickPlace) | ||
| TkText *textPtr; /* Widget record for text widget. */ | ||
| TkTextIndex *indexPtr; /* Position that is to appear somewhere | ||
| * in the view. */ | ||
| int pickPlace; /* 0 means topLine must appear at top of | ||
| * screen. 1 means we get to pick where it | ||
| * appears: minimize screen motion or else | ||
| * display line at center of screen. */ | ||
| { | ||
| TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| register DLine *dlPtr; | ||
| int bottomY, close, lineIndex; | ||
| TkTextIndex tmpIndex, rounded; | ||
| Tk_FontMetrics fm; | ||
| /* | ||
| * If the specified position is the extra line at the end of the | ||
| * text, round it back to the last real line. | ||
| */ | ||
| lineIndex = TkBTreeLineIndex(indexPtr->linePtr); | ||
| if (lineIndex == TkBTreeNumLines(indexPtr->tree)) { | ||
| TkTextIndexBackChars(indexPtr, 1, &rounded); | ||
| indexPtr = &rounded; | ||
| } | ||
| if (!pickPlace) { | ||
| /* | ||
| * The specified position must go at the top of the screen. | ||
| * Just leave all the DLine's alone: we may be able to reuse | ||
| * some of the information that's currently on the screen | ||
| * without redisplaying it all. | ||
| */ | ||
| if (indexPtr->byteIndex == 0) { | ||
| textPtr->topIndex = *indexPtr; | ||
| } else { | ||
| MeasureUp(textPtr, indexPtr, 0, &textPtr->topIndex); | ||
| } | ||
| goto scheduleUpdate; | ||
| } | ||
| /* | ||
| * We have to pick where to display the index. First, bring | ||
| * the display information up to date and see if the index will be | ||
| * completely visible in the current screen configuration. If so | ||
| * then there's nothing to do. | ||
| */ | ||
| if (dInfoPtr->flags & DINFO_OUT_OF_DATE) { | ||
| UpdateDisplayInfo(textPtr); | ||
| } | ||
| dlPtr = FindDLine(dInfoPtr->dLinePtr, indexPtr); | ||
| if (dlPtr != NULL) { | ||
| if ((dlPtr->y + dlPtr->height) > dInfoPtr->maxY) { | ||
| /* | ||
| * Part of the line hangs off the bottom of the screen; | ||
| * pretend the whole line is off-screen. | ||
| */ | ||
| dlPtr = NULL; | ||
| } else if ((dlPtr->index.linePtr == indexPtr->linePtr) | ||
| && (dlPtr->index.byteIndex <= indexPtr->byteIndex)) { | ||
| return; | ||
| } | ||
| } | ||
| /* | ||
| * The desired line isn't already on-screen. Figure out what | ||
| * it means to be "close" to the top or bottom of the screen. | ||
| * Close means within 1/3 of the screen height or within three | ||
| * lines, whichever is greater. Add one extra line also, to | ||
| * account for the way MeasureUp rounds. | ||
| */ | ||
| Tk_GetFontMetrics(textPtr->tkfont, &fm); | ||
| bottomY = (dInfoPtr->y + dInfoPtr->maxY + fm.linespace)/2; | ||
| close = (dInfoPtr->maxY - dInfoPtr->y)/3; | ||
| if (close < 3*fm.linespace) { | ||
| close = 3*fm.linespace; | ||
| } | ||
| close += fm.linespace; | ||
| if (dlPtr != NULL) { | ||
| /* | ||
| * The desired line is above the top of screen. If it is | ||
| * "close" to the top of the window then make it the top | ||
| * line on the screen. | ||
| */ | ||
| MeasureUp(textPtr, &textPtr->topIndex, close, &tmpIndex); | ||
| if (TkTextIndexCmp(&tmpIndex, indexPtr) <= 0) { | ||
| MeasureUp(textPtr, indexPtr, 0, &textPtr->topIndex); | ||
| goto scheduleUpdate; | ||
| } | ||
| } else { | ||
| /* | ||
| * The desired line is below the bottom of the screen. If it is | ||
| * "close" to the bottom of the screen then position it at the | ||
| * bottom of the screen. | ||
| */ | ||
| MeasureUp(textPtr, indexPtr, close, &tmpIndex); | ||
| if (FindDLine(dInfoPtr->dLinePtr, &tmpIndex) != NULL) { | ||
| bottomY = dInfoPtr->maxY - dInfoPtr->y; | ||
| } | ||
| } | ||
| /* | ||
| * Our job now is to arrange the display so that indexPtr appears | ||
| * as low on the screen as possible but with its bottom no lower | ||
| * than bottomY. BottomY is the bottom of the window if the | ||
| * desired line is just below the current screen, otherwise it | ||
| * is a half-line lower than the center of the window. | ||
| */ | ||
| MeasureUp(textPtr, indexPtr, bottomY, &textPtr->topIndex); | ||
| scheduleUpdate: | ||
| if (!(dInfoPtr->flags & REDRAW_PENDING)) { | ||
| Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr); | ||
| } | ||
| dInfoPtr->flags |= REDRAW_PENDING|DINFO_OUT_OF_DATE|REPICK_NEEDED; | ||
| } | ||
| /* | ||
| *-------------------------------------------------------------- | ||
| * | ||
| * MeasureUp -- | ||
| * | ||
| * Given one index, find the index of the first character | ||
| * on the highest display line that would be displayed no more | ||
| * than "distance" pixels above the given index. | ||
| * | ||
| * Results: | ||
| * *dstPtr is filled in with the index of the first character | ||
| * on a display line. The display line is found by measuring | ||
| * up "distance" pixels above the pixel just below an imaginary | ||
| * display line that contains srcPtr. If the display line | ||
| * that covers this coordinate actually extends above the | ||
| * coordinate, then return the index of the next lower line | ||
| * instead (i.e. the returned index will be completely visible | ||
| * at or below the given y-coordinate). | ||
| * | ||
| * Side effects: | ||
| * None. | ||
| * | ||
| *-------------------------------------------------------------- | ||
| */ | ||
| static void | ||
| MeasureUp(textPtr, srcPtr, distance, dstPtr) | ||
| TkText *textPtr; /* Text widget in which to measure. */ | ||
| TkTextIndex *srcPtr; /* Index of character from which to start | ||
| * measuring. */ | ||
| int distance; /* Vertical distance in pixels measured | ||
| * from the pixel just below the lowest | ||
| * one in srcPtr's line. */ | ||
| TkTextIndex *dstPtr; /* Index to fill in with result. */ | ||
| { | ||
| int lineNum; /* Number of current line. */ | ||
| int bytesToCount; /* Maximum number of bytes to measure in | ||
| * current line. */ | ||
| TkTextIndex bestIndex; /* Best candidate seen so far for result. */ | ||
| TkTextIndex index; | ||
| DLine *dlPtr, *lowestPtr; | ||
| int noBestYet; /* 1 means bestIndex hasn't been set. */ | ||
| noBestYet = 1; | ||
| bytesToCount = srcPtr->byteIndex + 1; | ||
| index.tree = srcPtr->tree; | ||
| for (lineNum = TkBTreeLineIndex(srcPtr->linePtr); lineNum >= 0; | ||
| lineNum--) { | ||
| /* | ||
| * Layout an entire text line (potentially > 1 display line). | ||
| * For the first line, which contains srcPtr, only layout the | ||
| * part up through srcPtr (bytesToCount is non-infinite to | ||
| * accomplish this). Make a list of all the display lines | ||
| * in backwards order (the lowest DLine on the screen is first | ||
| * in the list). | ||
| */ | ||
| index.linePtr = TkBTreeFindLine(srcPtr->tree, lineNum); | ||
| index.byteIndex = 0; | ||
| lowestPtr = NULL; | ||
| do { | ||
| dlPtr = LayoutDLine(textPtr, &index); | ||
| dlPtr->nextPtr = lowestPtr; | ||
| lowestPtr = dlPtr; | ||
| TkTextIndexForwBytes(&index, dlPtr->byteCount, &index); | ||
| bytesToCount -= dlPtr->byteCount; | ||
| } while ((bytesToCount > 0) && (index.linePtr == dlPtr->index.linePtr)); | ||
| /* | ||
| * Scan through the display lines to see if we've covered enough | ||
| * vertical distance. If so, save the starting index for the | ||
| * line at the desired location. | ||
| */ | ||
| for (dlPtr = lowestPtr; dlPtr != NULL; dlPtr = dlPtr->nextPtr) { | ||
| distance -= dlPtr->height; | ||
| if (distance < 0) { | ||
| *dstPtr = (noBestYet) ? dlPtr->index : bestIndex; | ||
| break; | ||
| } | ||
| bestIndex = dlPtr->index; | ||
| noBestYet = 0; | ||
| } | ||
| /* | ||
| * Discard the display lines, then either return or prepare | ||
| * for the next display line to lay out. | ||
| */ | ||
| FreeDLines(textPtr, lowestPtr, (DLine *) NULL, 0); | ||
| if (distance < 0) { | ||
| return; | ||
| } | ||
| bytesToCount = INT_MAX; /* Consider all chars. in next line. */ | ||
| } | ||
| /* | ||
| * Ran off the beginning of the text. Return the first character | ||
| * in the text. | ||
| */ | ||
| TkTextMakeByteIndex(textPtr->tree, 0, 0, dstPtr); | ||
| } | ||
| /* | ||
| *-------------------------------------------------------------- | ||
| * | ||
| * TkTextSeeCmd -- | ||
| * | ||
| * This procedure is invoked to process the "see" option for | ||
| * the widget command for text widgets. See the user documentation | ||
| * for details on what it does. | ||
| * | ||
| * Results: | ||
| * A standard Tcl result. | ||
| * | ||
| * Side effects: | ||
| * See the user documentation. | ||
| * | ||
| *-------------------------------------------------------------- | ||
| */ | ||
| int | ||
| TkTextSeeCmd(textPtr, interp, argc, argv) | ||
| TkText *textPtr; /* Information about text widget. */ | ||
| Tcl_Interp *interp; /* Current interpreter. */ | ||
| int argc; /* Number of arguments. */ | ||
| char **argv; /* Argument strings. Someone else has already | ||
| * parsed this command enough to know that | ||
| * argv[1] is "see". */ | ||
| { | ||
| TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| TkTextIndex index; | ||
| int x, y, width, height, lineWidth, byteCount, oneThird, delta; | ||
| DLine *dlPtr; | ||
| TkTextDispChunk *chunkPtr; | ||
| if (argc != 3) { | ||
| Tcl_AppendResult(interp, "wrong # args: should be \"", | ||
| argv[0], " see index\"", (char *) NULL); | ||
| return TCL_ERROR; | ||
| } | ||
| if (TkTextGetIndex(interp, textPtr, argv[2], &index) != TCL_OK) { | ||
| return TCL_ERROR; | ||
| } | ||
| /* | ||
| * If the specified position is the extra line at the end of the | ||
| * text, round it back to the last real line. | ||
| */ | ||
| if (TkBTreeLineIndex(index.linePtr) == TkBTreeNumLines(index.tree)) { | ||
| TkTextIndexBackChars(&index, 1, &index); | ||
| } | ||
| /* | ||
| * First get the desired position into the vertical range of the window. | ||
| */ | ||
| TkTextSetYView(textPtr, &index, 1); | ||
| /* | ||
| * Now make sure that the character is in view horizontally. | ||
| */ | ||
| if (dInfoPtr->flags & DINFO_OUT_OF_DATE) { | ||
| UpdateDisplayInfo(textPtr); | ||
| } | ||
| lineWidth = dInfoPtr->maxX - dInfoPtr->x; | ||
| if (dInfoPtr->maxLength < lineWidth) { | ||
| return TCL_OK; | ||
| } | ||
| /* | ||
| * Find the chunk that contains the desired index. | ||
| */ | ||
| dlPtr = FindDLine(dInfoPtr->dLinePtr, &index); | ||
| byteCount = index.byteIndex - dlPtr->index.byteIndex; | ||
| for (chunkPtr = dlPtr->chunkPtr; chunkPtr!=NULL ; chunkPtr = chunkPtr->nextPtr) { | ||
| if (byteCount < chunkPtr->numBytes) { | ||
| break; | ||
| } | ||
| byteCount -= chunkPtr->numBytes; | ||
| } | ||
| /* | ||
| * Call a chunk-specific procedure to find the horizontal range of | ||
| * the character within the chunk. | ||
| */ | ||
| if (chunkPtr!=NULL) { /* chunkPtr==NULL iff trying to see in elided region */ | ||
| (*chunkPtr->bboxProc)(chunkPtr, byteCount, dlPtr->y + dlPtr->spaceAbove, | ||
| dlPtr->height - dlPtr->spaceAbove - dlPtr->spaceBelow, | ||
| dlPtr->baseline - dlPtr->spaceAbove, &x, &y, &width, | ||
| &height); | ||
| delta = x - dInfoPtr->curPixelOffset; | ||
| oneThird = lineWidth/3; | ||
| if (delta < 0) { | ||
| if (delta < -oneThird) { | ||
| dInfoPtr->newByteOffset = (x - lineWidth/2)/textPtr->charWidth; | ||
| } else { | ||
| dInfoPtr->newByteOffset -= ((-delta) + textPtr->charWidth - 1) | ||
| / textPtr->charWidth; | ||
| } | ||
| } else { | ||
| delta -= (lineWidth - width); | ||
| if (delta > 0) { | ||
| if (delta > oneThird) { | ||
| dInfoPtr->newByteOffset = (x - lineWidth/2)/textPtr->charWidth; | ||
| } else { | ||
| dInfoPtr->newByteOffset += (delta + textPtr->charWidth - 1) | ||
| / textPtr->charWidth; | ||
| } | ||
| } else { | ||
| return TCL_OK; | ||
| } | ||
| }} | ||
| dInfoPtr->flags |= DINFO_OUT_OF_DATE; | ||
| if (!(dInfoPtr->flags & REDRAW_PENDING)) { | ||
| dInfoPtr->flags |= REDRAW_PENDING; | ||
| Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr); | ||
| } | ||
| return TCL_OK; | ||
| } | ||
| /* | ||
| *-------------------------------------------------------------- | ||
| * | ||
| * TkTextXviewCmd -- | ||
| * | ||
| * This procedure is invoked to process the "xview" option for | ||
| * the widget command for text widgets. See the user documentation | ||
| * for details on what it does. | ||
| * | ||
| * Results: | ||
| * A standard Tcl result. | ||
| * | ||
| * Side effects: | ||
| * See the user documentation. | ||
| * | ||
| *-------------------------------------------------------------- | ||
| */ | ||
| int | ||
| TkTextXviewCmd(textPtr, interp, argc, argv) | ||
| TkText *textPtr; /* Information about text widget. */ | ||
| Tcl_Interp *interp; /* Current interpreter. */ | ||
| int argc; /* Number of arguments. */ | ||
| char **argv; /* Argument strings. Someone else has already | ||
| * parsed this command enough to know that | ||
| * argv[1] is "xview". */ | ||
| { | ||
| TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| int type, charsPerPage, count, newOffset; | ||
| double fraction; | ||
| if (dInfoPtr->flags & DINFO_OUT_OF_DATE) { | ||
| UpdateDisplayInfo(textPtr); | ||
| } | ||
| if (argc == 2) { | ||
| GetXView(interp, textPtr, 0); | ||
| return TCL_OK; | ||
| } | ||
| newOffset = dInfoPtr->newByteOffset; | ||
| type = Tk_GetScrollInfo(interp, argc, argv, &fraction, &count); | ||
| switch (type) { | ||
| case TK_SCROLL_ERROR: | ||
| return TCL_ERROR; | ||
| case TK_SCROLL_MOVETO: | ||
| if (fraction > 1.0) { | ||
| fraction = 1.0; | ||
| } | ||
| if (fraction < 0) { | ||
| fraction = 0; | ||
| } | ||
| newOffset = (int) (((fraction * dInfoPtr->maxLength) / textPtr->charWidth) | ||
| + 0.5); | ||
| break; | ||
| case TK_SCROLL_PAGES: | ||
| charsPerPage = ((dInfoPtr->maxX - dInfoPtr->x) / textPtr->charWidth) | ||
| - 2; | ||
| if (charsPerPage < 1) { | ||
| charsPerPage = 1; | ||
| } | ||
| newOffset += charsPerPage * count; | ||
| break; | ||
| case TK_SCROLL_UNITS: | ||
| newOffset += count; | ||
| break; | ||
| } | ||
| dInfoPtr->newByteOffset = newOffset; | ||
| dInfoPtr->flags |= DINFO_OUT_OF_DATE; | ||
| if (!(dInfoPtr->flags & REDRAW_PENDING)) { | ||
| dInfoPtr->flags |= REDRAW_PENDING; | ||
| Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr); | ||
| } | ||
| return TCL_OK; | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * ScrollByLines -- | ||
| * | ||
| * This procedure is called to scroll a text widget up or down | ||
| * by a given number of lines. | ||
| * | ||
| * Results: | ||
| * None. | ||
| * | ||
| * Side effects: | ||
| * The view in textPtr's window changes to reflect the value | ||
| * of "offset". | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| static void | ||
| ScrollByLines(textPtr, offset) | ||
| TkText *textPtr; /* Widget to scroll. */ | ||
| int offset; /* Amount by which to scroll, in *screen* | ||
| * lines. Positive means that information | ||
| * later in text becomes visible, negative | ||
| * means that information earlier in the | ||
| * text becomes visible. */ | ||
| { | ||
| int i, bytesToCount, lineNum; | ||
| TkTextIndex new, index; | ||
| TkTextLine *lastLinePtr; | ||
| TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| DLine *dlPtr, *lowestPtr; | ||
| if (offset < 0) { | ||
| /* | ||
| * Must scroll up (to show earlier information in the text). | ||
| * The code below is similar to that in MeasureUp, except that | ||
| * it counts lines instead of pixels. | ||
| */ | ||
| bytesToCount = textPtr->topIndex.byteIndex + 1; | ||
| index.tree = textPtr->tree; | ||
| offset--; /* Skip line containing topIndex. */ | ||
| for (lineNum = TkBTreeLineIndex(textPtr->topIndex.linePtr); | ||
| lineNum >= 0; lineNum--) { | ||
| index.linePtr = TkBTreeFindLine(textPtr->tree, lineNum); | ||
| index.byteIndex = 0; | ||
| lowestPtr = NULL; | ||
| do { | ||
| dlPtr = LayoutDLine(textPtr, &index); | ||
| dlPtr->nextPtr = lowestPtr; | ||
| lowestPtr = dlPtr; | ||
| TkTextIndexForwBytes(&index, dlPtr->byteCount, &index); | ||
| bytesToCount -= dlPtr->byteCount; | ||
| } while ((bytesToCount > 0) | ||
| && (index.linePtr == dlPtr->index.linePtr)); | ||
| for (dlPtr = lowestPtr; dlPtr != NULL; dlPtr = dlPtr->nextPtr) { | ||
| offset++; | ||
| if (offset == 0) { | ||
| textPtr->topIndex = dlPtr->index; | ||
| break; | ||
| } | ||
| } | ||
| /* | ||
| * Discard the display lines, then either return or prepare | ||
| * for the next display line to lay out. | ||
| */ | ||
| FreeDLines(textPtr, lowestPtr, (DLine *) NULL, 0); | ||
| if (offset >= 0) { | ||
| goto scheduleUpdate; | ||
| } | ||
| bytesToCount = INT_MAX; | ||
| } | ||
| /* | ||
| * Ran off the beginning of the text. Return the first character | ||
| * in the text. | ||
| */ | ||
| TkTextMakeByteIndex(textPtr->tree, 0, 0, &textPtr->topIndex); | ||
| } else { | ||
| /* | ||
| * Scrolling down, to show later information in the text. | ||
| * Just count lines from the current top of the window. | ||
| */ | ||
| lastLinePtr = TkBTreeFindLine(textPtr->tree, | ||
| TkBTreeNumLines(textPtr->tree)); | ||
| for (i = 0; i < offset; i++) { | ||
| dlPtr = LayoutDLine(textPtr, &textPtr->topIndex); | ||
| if (dlPtr->length == 0 && dlPtr->height == 0) offset++; | ||
| dlPtr->nextPtr = NULL; | ||
| TkTextIndexForwBytes(&textPtr->topIndex, dlPtr->byteCount, &new); | ||
| FreeDLines(textPtr, dlPtr, (DLine *) NULL, 0); | ||
| if (new.linePtr == lastLinePtr) { | ||
| break; | ||
| } | ||
| textPtr->topIndex = new; | ||
| } | ||
| } | ||
| scheduleUpdate: | ||
| if (!(dInfoPtr->flags & REDRAW_PENDING)) { | ||
| Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr); | ||
| } | ||
| dInfoPtr->flags |= REDRAW_PENDING|DINFO_OUT_OF_DATE|REPICK_NEEDED; | ||
| } | ||
| /* | ||
| *-------------------------------------------------------------- | ||
| * | ||
| * TkTextYviewCmd -- | ||
| * | ||
| * This procedure is invoked to process the "yview" option for | ||
| * the widget command for text widgets. See the user documentation | ||
| * for details on what it does. | ||
| * | ||
| * Results: | ||
| * A standard Tcl result. | ||
| * | ||
| * Side effects: | ||
| * See the user documentation. | ||
| * | ||
| *-------------------------------------------------------------- | ||
| */ | ||
| int | ||
| TkTextYviewCmd(textPtr, interp, argc, argv) | ||
| TkText *textPtr; /* Information about text widget. */ | ||
| Tcl_Interp *interp; /* Current interpreter. */ | ||
| int argc; /* Number of arguments. */ | ||
| char **argv; /* Argument strings. Someone else has already | ||
| * parsed this command enough to know that | ||
| * argv[1] is "yview". */ | ||
| { | ||
| TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| int pickPlace, lineNum, type, bytesInLine; | ||
| Tk_FontMetrics fm; | ||
| int pixels, count; | ||
| size_t switchLength; | ||
| double fraction; | ||
| TkTextIndex index, new; | ||
| TkTextLine *lastLinePtr; | ||
| DLine *dlPtr; | ||
| if (dInfoPtr->flags & DINFO_OUT_OF_DATE) { | ||
| UpdateDisplayInfo(textPtr); | ||
| } | ||
| if (argc == 2) { | ||
| GetYView(interp, textPtr, 0); | ||
| return TCL_OK; | ||
| } | ||
| /* | ||
| * Next, handle the old syntax: "pathName yview ?-pickplace? where" | ||
| */ | ||
| pickPlace = 0; | ||
| if (argv[2][0] == '-') { | ||
| switchLength = strlen(argv[2]); | ||
| if ((switchLength >= 2) | ||
| && (strncmp(argv[2], "-pickplace", switchLength) == 0)) { | ||
| pickPlace = 1; | ||
| if (argc != 4) { | ||
| Tcl_AppendResult(interp, "wrong # args: should be \"", | ||
| argv[0], " yview -pickplace lineNum|index\"", | ||
| (char *) NULL); | ||
| return TCL_ERROR; | ||
| } | ||
| } | ||
| } | ||
| if ((argc == 3) || pickPlace) { | ||
| if (Tcl_GetInt(interp, argv[2+pickPlace], &lineNum) == TCL_OK) { | ||
| TkTextMakeByteIndex(textPtr->tree, lineNum, 0, &index); | ||
| TkTextSetYView(textPtr, &index, 0); | ||
| return TCL_OK; | ||
| } | ||
| /* | ||
| * The argument must be a regular text index. | ||
| */ | ||
| Tcl_ResetResult(interp); | ||
| if (TkTextGetIndex(interp, textPtr, argv[2+pickPlace], | ||
| &index) != TCL_OK) { | ||
| return TCL_ERROR; | ||
| } | ||
| TkTextSetYView(textPtr, &index, pickPlace); | ||
| return TCL_OK; | ||
| } | ||
| /* | ||
| * New syntax: dispatch based on argv[2]. | ||
| */ | ||
| type = Tk_GetScrollInfo(interp, argc, argv, &fraction, &count); | ||
| switch (type) { | ||
| case TK_SCROLL_ERROR: | ||
| return TCL_ERROR; | ||
| case TK_SCROLL_MOVETO: | ||
| if (fraction > 1.0) { | ||
| fraction = 1.0; | ||
| } | ||
| if (fraction < 0) { | ||
| fraction = 0; | ||
| } | ||
| fraction *= TkBTreeNumLines(textPtr->tree); | ||
| lineNum = (int) fraction; | ||
| TkTextMakeByteIndex(textPtr->tree, lineNum, 0, &index); | ||
| bytesInLine = TkBTreeBytesInLine(index.linePtr); | ||
| index.byteIndex = (int)((bytesInLine * (fraction-lineNum)) + 0.5); | ||
| if (index.byteIndex >= bytesInLine) { | ||
| TkTextMakeByteIndex(textPtr->tree, lineNum + 1, 0, &index); | ||
| } | ||
| TkTextSetYView(textPtr, &index, 0); | ||
| break; | ||
| case TK_SCROLL_PAGES: | ||
| /* | ||
| * Scroll up or down by screenfuls. Actually, use the | ||
| * window height minus two lines, so that there's some | ||
| * overlap between adjacent pages. | ||
| */ | ||
| Tk_GetFontMetrics(textPtr->tkfont, &fm); | ||
| if (count < 0) { | ||
| pixels = (dInfoPtr->maxY - 2*fm.linespace - dInfoPtr->y)*(-count) | ||
| + fm.linespace; | ||
| MeasureUp(textPtr, &textPtr->topIndex, pixels, &new); | ||
| if (TkTextIndexCmp(&textPtr->topIndex, &new) == 0) { | ||
| /* | ||
| * A page of scrolling ended up being less than one line. | ||
| * Scroll one line anyway. | ||
| */ | ||
| count = -1; | ||
| goto scrollByLines; | ||
| } | ||
| textPtr->topIndex = new; | ||
| } else { | ||
| /* | ||
| * Scrolling down by pages. Layout lines starting at the | ||
| * top index and count through the desired vertical distance. | ||
| */ | ||
| pixels = (dInfoPtr->maxY - 2*fm.linespace - dInfoPtr->y)*count; | ||
| lastLinePtr = TkBTreeFindLine(textPtr->tree, | ||
| TkBTreeNumLines(textPtr->tree)); | ||
| do { | ||
| dlPtr = LayoutDLine(textPtr, &textPtr->topIndex); | ||
| dlPtr->nextPtr = NULL; | ||
| TkTextIndexForwBytes(&textPtr->topIndex, dlPtr->byteCount, | ||
| &new); | ||
| pixels -= dlPtr->height; | ||
| FreeDLines(textPtr, dlPtr, (DLine *) NULL, 0); | ||
| if (new.linePtr == lastLinePtr) { | ||
| break; | ||
| } | ||
| textPtr->topIndex = new; | ||
| } while (pixels > 0); | ||
| } | ||
| if (!(dInfoPtr->flags & REDRAW_PENDING)) { | ||
| Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr); | ||
| } | ||
| dInfoPtr->flags |= REDRAW_PENDING|DINFO_OUT_OF_DATE|REPICK_NEEDED; | ||
| break; | ||
| case TK_SCROLL_UNITS: | ||
| scrollByLines: | ||
| ScrollByLines(textPtr, count); | ||
| break; | ||
| } | ||
| return TCL_OK; | ||
| } | ||
| /* | ||
| *-------------------------------------------------------------- | ||
| * | ||
| * TkTextScanCmd -- | ||
| * | ||
| * This procedure is invoked to process the "scan" option for | ||
| * the widget command for text widgets. See the user documentation | ||
| * for details on what it does. | ||
| * | ||
| * Results: | ||
| * A standard Tcl result. | ||
| * | ||
| * Side effects: | ||
| * See the user documentation. | ||
| * | ||
| *-------------------------------------------------------------- | ||
| */ | ||
| int | ||
| TkTextScanCmd(textPtr, interp, argc, argv) | ||
| register TkText *textPtr; /* Information about text widget. */ | ||
| Tcl_Interp *interp; /* Current interpreter. */ | ||
| int argc; /* Number of arguments. */ | ||
| char **argv; /* Argument strings. Someone else has already | ||
| * parsed this command enough to know that | ||
| * argv[1] is "scan". */ | ||
| { | ||
| TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| TkTextIndex index; | ||
| int c, x, y, totalScroll, newByte, maxByte, gain=10; | ||
| Tk_FontMetrics fm; | ||
| size_t length; | ||
| if ((argc != 5) && (argc != 6)) { | ||
| Tcl_AppendResult(interp, "wrong # args: should be \"", | ||
| argv[0], " scan mark x y\" or \"", | ||
| argv[0], " scan dragto x y ?gain?\"", (char *) NULL); | ||
| return TCL_ERROR; | ||
| } | ||
| if (Tcl_GetInt(interp, argv[3], &x) != TCL_OK) { | ||
| return TCL_ERROR; | ||
| } | ||
| if (Tcl_GetInt(interp, argv[4], &y) != TCL_OK) { | ||
| return TCL_ERROR; | ||
| } | ||
| if ((argc == 6) && (Tcl_GetInt(interp, argv[5], &gain) != TCL_OK)) | ||
| return TCL_ERROR; | ||
| c = argv[2][0]; | ||
| length = strlen(argv[2]); | ||
| if ((c == 'd') && (strncmp(argv[2], "dragto", length) == 0)) { | ||
| /* | ||
| * Amplify the difference between the current position and the | ||
| * mark position to compute how much the view should shift, then | ||
| * update the mark position to correspond to the new view. If we | ||
| * run off the edge of the text, reset the mark point so that the | ||
| * current position continues to correspond to the edge of the | ||
| * window. This means that the picture will start dragging as | ||
| * soon as the mouse reverses direction (without this reset, might | ||
| * have to slide mouse a long ways back before the picture starts | ||
| * moving again). | ||
| */ | ||
| newByte = dInfoPtr->scanMarkIndex + (gain*(dInfoPtr->scanMarkX - x)) | ||
| / (textPtr->charWidth); | ||
| maxByte = 1 + (dInfoPtr->maxLength - (dInfoPtr->maxX - dInfoPtr->x) | ||
| + textPtr->charWidth - 1)/textPtr->charWidth; | ||
| if (newByte < 0) { | ||
| newByte = 0; | ||
| dInfoPtr->scanMarkIndex = 0; | ||
| dInfoPtr->scanMarkX = x; | ||
| } else if (newByte > maxByte) { | ||
| newByte = maxByte; | ||
| dInfoPtr->scanMarkIndex = maxByte; | ||
| dInfoPtr->scanMarkX = x; | ||
| } | ||
| dInfoPtr->newByteOffset = newByte; | ||
| Tk_GetFontMetrics(textPtr->tkfont, &fm); | ||
| totalScroll = (gain*(dInfoPtr->scanMarkY - y)) / fm.linespace; | ||
| if (totalScroll != dInfoPtr->scanTotalScroll) { | ||
| index = textPtr->topIndex; | ||
| ScrollByLines(textPtr, totalScroll-dInfoPtr->scanTotalScroll); | ||
| dInfoPtr->scanTotalScroll = totalScroll; | ||
| if ((index.linePtr == textPtr->topIndex.linePtr) && | ||
| (index.byteIndex == textPtr->topIndex.byteIndex)) { | ||
| dInfoPtr->scanTotalScroll = 0; | ||
| dInfoPtr->scanMarkY = y; | ||
| } | ||
| } | ||
| } else if ((c == 'm') && (strncmp(argv[2], "mark", length) == 0)) { | ||
| dInfoPtr->scanMarkIndex = dInfoPtr->newByteOffset; | ||
| dInfoPtr->scanMarkX = x; | ||
| dInfoPtr->scanTotalScroll = 0; | ||
| dInfoPtr->scanMarkY = y; | ||
| } else { | ||
| Tcl_AppendResult(interp, "bad scan option \"", argv[2], | ||
| "\": must be mark or dragto", (char *) NULL); | ||
| return TCL_ERROR; | ||
| } | ||
| dInfoPtr->flags |= DINFO_OUT_OF_DATE; | ||
| if (!(dInfoPtr->flags & REDRAW_PENDING)) { | ||
| dInfoPtr->flags |= REDRAW_PENDING; | ||
| Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr); | ||
| } | ||
| return TCL_OK; | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * GetXView -- | ||
| * | ||
| * This procedure computes the fractions that indicate what's | ||
| * visible in a text window and, optionally, evaluates a | ||
| * Tcl script to report them to the text's associated scrollbar. | ||
| * | ||
| * Results: | ||
| * If report is zero, then the interp's result is filled in with | ||
| * two real numbers separated by a space, giving the position of | ||
| * the left and right edges of the window as fractions from 0 to | ||
| * 1, where 0 means the left edge of the text and 1 means the right | ||
| * edge. If report is non-zero, then the interp's result isn't modified | ||
| * directly, but instead a script is evaluated in interp to report | ||
| * the new horizontal scroll position to the scrollbar (if the scroll | ||
| * position hasn't changed then no script is invoked). | ||
| * | ||
| * Side effects: | ||
| * None. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| static void | ||
| GetXView(interp, textPtr, report) | ||
| Tcl_Interp *interp; /* If "report" is FALSE, string | ||
| * describing visible range gets | ||
| * stored in the interp's result. */ | ||
| TkText *textPtr; /* Information about text widget. */ | ||
| int report; /* Non-zero means report info to | ||
| * scrollbar if it has changed. */ | ||
| { | ||
| TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| char buffer[TCL_DOUBLE_SPACE * 2]; | ||
| double first, last; | ||
| int code; | ||
| if (dInfoPtr->maxLength > 0) { | ||
| first = ((double) dInfoPtr->curPixelOffset) | ||
| / dInfoPtr->maxLength; | ||
| last = first + ((double) (dInfoPtr->maxX - dInfoPtr->x)) | ||
| / dInfoPtr->maxLength; | ||
| if (last > 1.0) { | ||
| last = 1.0; | ||
| } | ||
| } else { | ||
| first = 0; | ||
| last = 1.0; | ||
| } | ||
| if (!report) { | ||
| sprintf(buffer, "%g %g", first, last); | ||
| Tcl_SetResult(interp, buffer, TCL_VOLATILE); | ||
| return; | ||
| } | ||
| if ((first == dInfoPtr->xScrollFirst) && (last == dInfoPtr->xScrollLast)) { | ||
| return; | ||
| } | ||
| dInfoPtr->xScrollFirst = first; | ||
| dInfoPtr->xScrollLast = last; | ||
| sprintf(buffer, " %g %g", first, last); | ||
| code = Tcl_VarEval(interp, textPtr->xScrollCmd, | ||
| buffer, (char *) NULL); | ||
| if (code != TCL_OK) { | ||
| Tcl_AddErrorInfo(interp, | ||
| "\n (horizontal scrolling command executed by text)"); | ||
| Tcl_BackgroundError(interp); | ||
| } | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * GetYView -- | ||
| * | ||
| * This procedure computes the fractions that indicate what's | ||
| * visible in a text window and, optionally, evaluates a | ||
| * Tcl script to report them to the text's associated scrollbar. | ||
| * | ||
| * Results: | ||
| * If report is zero, then the interp's result is filled in with | ||
| * two real numbers separated by a space, giving the position of | ||
| * the top and bottom of the window as fractions from 0 to 1, where | ||
| * 0 means the beginning of the text and 1 means the end. If | ||
| * report is non-zero, then the interp's result isn't modified directly, | ||
| * but a script is evaluated in interp to report the new scroll | ||
| * position to the scrollbar (if the scroll position hasn't changed | ||
| * then no script is invoked). | ||
| * | ||
| * Side effects: | ||
| * None. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| static void | ||
| GetYView(interp, textPtr, report) | ||
| Tcl_Interp *interp; /* If "report" is FALSE, string | ||
| * describing visible range gets | ||
| * stored in the interp's result. */ | ||
| TkText *textPtr; /* Information about text widget. */ | ||
| int report; /* Non-zero means report info to | ||
| * scrollbar if it has changed. */ | ||
| { | ||
| TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| char buffer[TCL_DOUBLE_SPACE * 2]; | ||
| double first, last; | ||
| DLine *dlPtr; | ||
| int totalLines, code, count; | ||
| dlPtr = dInfoPtr->dLinePtr; | ||
| totalLines = TkBTreeNumLines(textPtr->tree); | ||
| first = (double) TkBTreeLineIndex(dlPtr->index.linePtr) | ||
| + (double) dlPtr->index.byteIndex | ||
| / TkBTreeBytesInLine(dlPtr->index.linePtr); | ||
| first /= totalLines; | ||
| while (1) { | ||
| if ((dlPtr->y + dlPtr->height) > dInfoPtr->maxY) { | ||
| /* | ||
| * The last line is only partially visible, so don't | ||
| * count its characters in what's visible. | ||
| */ | ||
| count = 0; | ||
| break; | ||
| } | ||
| if (dlPtr->nextPtr == NULL) { | ||
| count = dlPtr->byteCount; | ||
| break; | ||
| } | ||
| dlPtr = dlPtr->nextPtr; | ||
| } | ||
| last = ((double) TkBTreeLineIndex(dlPtr->index.linePtr)) | ||
| + ((double) (dlPtr->index.byteIndex + count)) | ||
| / (TkBTreeBytesInLine(dlPtr->index.linePtr)); | ||
| last /= totalLines; | ||
| if (!report) { | ||
| sprintf(buffer, "%g %g", first, last); | ||
| Tcl_SetResult(interp, buffer, TCL_VOLATILE); | ||
| return; | ||
| } | ||
| if ((first == dInfoPtr->yScrollFirst) && (last == dInfoPtr->yScrollLast)) { | ||
| return; | ||
| } | ||
| dInfoPtr->yScrollFirst = first; | ||
| dInfoPtr->yScrollLast = last; | ||
| sprintf(buffer, " %g %g", first, last); | ||
| code = Tcl_VarEval(interp, textPtr->yScrollCmd, buffer, (char *) NULL); | ||
| if (code != TCL_OK) { | ||
| Tcl_AddErrorInfo(interp, | ||
| "\n (vertical scrolling command executed by text)"); | ||
| Tcl_BackgroundError(interp); | ||
| } | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * FindDLine -- | ||
| * | ||
| * This procedure is called to find the DLine corresponding to a | ||
| * given text index. | ||
| * | ||
| * Results: | ||
| * The return value is a pointer to the first DLine found in the | ||
| * list headed by dlPtr that displays information at or after the | ||
| * specified position. If there is no such line in the list then | ||
| * NULL is returned. | ||
| * | ||
| * Side effects: | ||
| * None. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| static DLine * | ||
| FindDLine(dlPtr, indexPtr) | ||
| register DLine *dlPtr; /* Pointer to first in list of DLines | ||
| * to search. */ | ||
| TkTextIndex *indexPtr; /* Index of desired character. */ | ||
| { | ||
| TkTextLine *linePtr; | ||
| if (dlPtr == NULL) { | ||
| return NULL; | ||
| } | ||
| if (TkBTreeLineIndex(indexPtr->linePtr) | ||
| < TkBTreeLineIndex(dlPtr->index.linePtr)) { | ||
| /* | ||
| * The first display line is already past the desired line. | ||
| */ | ||
| return dlPtr; | ||
| } | ||
| /* | ||
| * Find the first display line that covers the desired text line. | ||
| */ | ||
| linePtr = dlPtr->index.linePtr; | ||
| while (linePtr != indexPtr->linePtr) { | ||
| while (dlPtr->index.linePtr == linePtr) { | ||
| dlPtr = dlPtr->nextPtr; | ||
| if (dlPtr == NULL) { | ||
| return NULL; | ||
| } | ||
| } | ||
| linePtr = TkBTreeNextLine(linePtr); | ||
| if (linePtr == NULL) { | ||
| panic("FindDLine reached end of text"); | ||
| } | ||
| } | ||
| if (indexPtr->linePtr != dlPtr->index.linePtr) { | ||
| return dlPtr; | ||
| } | ||
| /* | ||
| * Now get to the right position within the text line. | ||
| */ | ||
| while (indexPtr->byteIndex >= (dlPtr->index.byteIndex + dlPtr->byteCount)) { | ||
| dlPtr = dlPtr->nextPtr; | ||
| if ((dlPtr == NULL) || (dlPtr->index.linePtr != indexPtr->linePtr)) { | ||
| break; | ||
| } | ||
| } | ||
| return dlPtr; | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * TkTextPixelIndex -- | ||
| * | ||
| * Given an (x,y) coordinate on the screen, find the location of | ||
| * the character closest to that location. | ||
| * | ||
| * Results: | ||
| * The index at *indexPtr is modified to refer to the character | ||
| * on the display that is closest to (x,y). | ||
| * | ||
| * Side effects: | ||
| * None. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| void | ||
| TkTextPixelIndex(textPtr, x, y, indexPtr) | ||
| TkText *textPtr; /* Widget record for text widget. */ | ||
| int x, y; /* Pixel coordinates of point in widget's | ||
| * window. */ | ||
| TkTextIndex *indexPtr; /* This index gets filled in with the | ||
| * index of the character nearest to (x,y). */ | ||
| { | ||
| TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| register DLine *dlPtr, *validdlPtr; | ||
| register TkTextDispChunk *chunkPtr; | ||
| /* | ||
| * Make sure that all of the layout information about what's | ||
| * displayed where on the screen is up-to-date. | ||
| */ | ||
| if (dInfoPtr->flags & DINFO_OUT_OF_DATE) { | ||
| UpdateDisplayInfo(textPtr); | ||
| } | ||
| /* | ||
| * If the coordinates are above the top of the window, then adjust | ||
| * them to refer to the upper-right corner of the window. If they're | ||
| * off to one side or the other, then adjust to the closest side. | ||
| */ | ||
| if (y < dInfoPtr->y) { | ||
| y = dInfoPtr->y; | ||
| x = dInfoPtr->x; | ||
| } | ||
| if (x >= dInfoPtr->maxX) { | ||
| x = dInfoPtr->maxX - 1; | ||
| } | ||
| if (x < dInfoPtr->x) { | ||
| x = dInfoPtr->x; | ||
| } | ||
| /* | ||
| * Find the display line containing the desired y-coordinate. | ||
| */ | ||
| for (dlPtr = validdlPtr = dInfoPtr->dLinePtr; y >= (dlPtr->y + dlPtr->height); | ||
| dlPtr = dlPtr->nextPtr) { | ||
| if (dlPtr->chunkPtr !=NULL) validdlPtr = dlPtr; | ||
| if (dlPtr->nextPtr == NULL) { | ||
| /* | ||
| * Y-coordinate is off the bottom of the displayed text. | ||
| * Use the last character on the last line. | ||
| */ | ||
| x = dInfoPtr->maxX - 1; | ||
| break; | ||
| } | ||
| } | ||
| if (dlPtr->chunkPtr == NULL) dlPtr = validdlPtr; | ||
| /* | ||
| * Scan through the line's chunks to find the one that contains | ||
| * the desired x-coordinate. Before doing this, translate the | ||
| * x-coordinate from the coordinate system of the window to the | ||
| * coordinate system of the line (to take account of x-scrolling). | ||
| */ | ||
| *indexPtr = dlPtr->index; | ||
| x = x - dInfoPtr->x + dInfoPtr->curPixelOffset; | ||
| for (chunkPtr = dlPtr->chunkPtr; x >= (chunkPtr->x + chunkPtr->width); | ||
| indexPtr->byteIndex += chunkPtr->numBytes, | ||
| chunkPtr = chunkPtr->nextPtr) { | ||
| if (chunkPtr->nextPtr == NULL) { | ||
| indexPtr->byteIndex += chunkPtr->numBytes; | ||
| TkTextIndexBackChars(indexPtr, 1, indexPtr); | ||
| return; | ||
| } | ||
| } | ||
| /* | ||
| * If the chunk has more than one byte in it, ask it which | ||
| * character is at the desired location. | ||
| */ | ||
| if (chunkPtr->numBytes > 1) { | ||
| indexPtr->byteIndex += (*chunkPtr->measureProc)(chunkPtr, x); | ||
| } | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * TkTextCharBbox -- | ||
| * | ||
| * Given an index, find the bounding box of the screen area | ||
| * occupied by that character. | ||
| * | ||
| * Results: | ||
| * Zero is returned if the character is on the screen. -1 | ||
| * means the character isn't on the screen. If the return value | ||
| * is 0, then the bounding box of the part of the character that's | ||
| * visible on the screen is returned to *xPtr, *yPtr, *widthPtr, | ||
| * and *heightPtr. | ||
| * | ||
| * Side effects: | ||
| * None. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| int | ||
| TkTextCharBbox(textPtr, indexPtr, xPtr, yPtr, widthPtr, heightPtr) | ||
| TkText *textPtr; /* Widget record for text widget. */ | ||
| TkTextIndex *indexPtr; /* Index of character whose bounding | ||
| * box is desired. */ | ||
| int *xPtr, *yPtr; /* Filled with character's upper-left | ||
| * coordinate. */ | ||
| int *widthPtr, *heightPtr; /* Filled in with character's dimensions. */ | ||
| { | ||
| TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| DLine *dlPtr; | ||
| register TkTextDispChunk *chunkPtr; | ||
| int byteIndex; | ||
| /* | ||
| * Make sure that all of the screen layout information is up to date. | ||
| */ | ||
| if (dInfoPtr->flags & DINFO_OUT_OF_DATE) { | ||
| UpdateDisplayInfo(textPtr); | ||
| } | ||
| /* | ||
| * Find the display line containing the desired index. | ||
| */ | ||
| dlPtr = FindDLine(dInfoPtr->dLinePtr, indexPtr); | ||
| if ((dlPtr == NULL) || (TkTextIndexCmp(&dlPtr->index, indexPtr) > 0)) { | ||
| return -1; | ||
| } | ||
| /* | ||
| * Find the chunk within the line that contains the desired | ||
| * index. | ||
| */ | ||
| byteIndex = indexPtr->byteIndex - dlPtr->index.byteIndex; | ||
| for (chunkPtr = dlPtr->chunkPtr; ; chunkPtr = chunkPtr->nextPtr) { | ||
| if (chunkPtr == NULL) { | ||
| return -1; | ||
| } | ||
| if (byteIndex < chunkPtr->numBytes) { | ||
| break; | ||
| } | ||
| byteIndex -= chunkPtr->numBytes; | ||
| } | ||
| /* | ||
| * Call a chunk-specific procedure to find the horizontal range of | ||
| * the character within the chunk, then fill in the vertical range. | ||
| * The x-coordinate returned by bboxProc is a coordinate within a | ||
| * line, not a coordinate on the screen. Translate it to reflect | ||
| * horizontal scrolling. | ||
| */ | ||
| (*chunkPtr->bboxProc)(chunkPtr, byteIndex, dlPtr->y + dlPtr->spaceAbove, | ||
| dlPtr->height - dlPtr->spaceAbove - dlPtr->spaceBelow, | ||
| dlPtr->baseline - dlPtr->spaceAbove, xPtr, yPtr, widthPtr, | ||
| heightPtr); | ||
| *xPtr = *xPtr + dInfoPtr->x - dInfoPtr->curPixelOffset; | ||
| if ((byteIndex == (chunkPtr->numBytes - 1)) && (chunkPtr->nextPtr == NULL)) { | ||
| /* | ||
| * Last character in display line. Give it all the space up to | ||
| * the line. | ||
| */ | ||
| if (*xPtr > dInfoPtr->maxX) { | ||
| *xPtr = dInfoPtr->maxX; | ||
| } | ||
| *widthPtr = dInfoPtr->maxX - *xPtr; | ||
| } | ||
| if ((*xPtr + *widthPtr) <= dInfoPtr->x) { | ||
| return -1; | ||
| } | ||
| if ((*xPtr + *widthPtr) > dInfoPtr->maxX) { | ||
| *widthPtr = dInfoPtr->maxX - *xPtr; | ||
| if (*widthPtr <= 0) { | ||
| return -1; | ||
| } | ||
| } | ||
| if ((*yPtr + *heightPtr) > dInfoPtr->maxY) { | ||
| *heightPtr = dInfoPtr->maxY - *yPtr; | ||
| if (*heightPtr <= 0) { | ||
| return -1; | ||
| } | ||
| } | ||
| return 0; | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * TkTextDLineInfo -- | ||
| * | ||
| * Given an index, return information about the display line | ||
| * containing that character. | ||
| * | ||
| * Results: | ||
| * Zero is returned if the character is on the screen. -1 | ||
| * means the character isn't on the screen. If the return value | ||
| * is 0, then information is returned in the variables pointed | ||
| * to by xPtr, yPtr, widthPtr, heightPtr, and basePtr. | ||
| * | ||
| * Side effects: | ||
| * None. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| int | ||
| TkTextDLineInfo(textPtr, indexPtr, xPtr, yPtr, widthPtr, heightPtr, basePtr) | ||
| TkText *textPtr; /* Widget record for text widget. */ | ||
| TkTextIndex *indexPtr; /* Index of character whose bounding | ||
| * box is desired. */ | ||
| int *xPtr, *yPtr; /* Filled with line's upper-left | ||
| * coordinate. */ | ||
| int *widthPtr, *heightPtr; /* Filled in with line's dimensions. */ | ||
| int *basePtr; /* Filled in with the baseline position, | ||
| * measured as an offset down from *yPtr. */ | ||
| { | ||
| TextDInfo *dInfoPtr = textPtr->dInfoPtr; | ||
| DLine *dlPtr; | ||
| int dlx; | ||
| /* | ||
| * Make sure that all of the screen layout information is up to date. | ||
| */ | ||
| if (dInfoPtr->flags & DINFO_OUT_OF_DATE) { | ||
| UpdateDisplayInfo(textPtr); | ||
| } | ||
| /* | ||
| * Find the display line containing the desired index. | ||
| */ | ||
| dlPtr = FindDLine(dInfoPtr->dLinePtr, indexPtr); | ||
| if ((dlPtr == NULL) || (TkTextIndexCmp(&dlPtr->index, indexPtr) > 0)) { | ||
| return -1; | ||
| } | ||
| dlx = (dlPtr->chunkPtr != NULL? dlPtr->chunkPtr->x: 0); | ||
| *xPtr = dInfoPtr->x - dInfoPtr->curPixelOffset + dlx; | ||
| *widthPtr = dlPtr->length - dlx; | ||
| *yPtr = dlPtr->y; | ||
| if ((dlPtr->y + dlPtr->height) > dInfoPtr->maxY) { | ||
| *heightPtr = dInfoPtr->maxY - dlPtr->y; | ||
| } else { | ||
| *heightPtr = dlPtr->height; | ||
| } | ||
| *basePtr = dlPtr->baseline; | ||
| return 0; | ||
| } | ||
| static void | ||
| ElideBboxProc(chunkPtr, index, y, lineHeight, baseline, xPtr, yPtr, | ||
| widthPtr, heightPtr) | ||
| TkTextDispChunk *chunkPtr; /* Chunk containing desired char. */ | ||
| int index; /* Index of desired character within | ||
| * the chunk. */ | ||
| int y; /* Topmost pixel in area allocated | ||
| * for this line. */ | ||
| int lineHeight; /* Height of line, in pixels. */ | ||
| int baseline; /* Location of line's baseline, in | ||
| * pixels measured down from y. */ | ||
| int *xPtr, *yPtr; /* Gets filled in with coords of | ||
| * character's upper-left pixel. | ||
| * X-coord is in same coordinate | ||
| * system as chunkPtr->x. */ | ||
| int *widthPtr; /* Gets filled in with width of | ||
| * character, in pixels. */ | ||
| int *heightPtr; /* Gets filled in with height of | ||
| * character, in pixels. */ | ||
| { | ||
| *xPtr = chunkPtr->x; | ||
| *yPtr = y; | ||
| *widthPtr = *heightPtr = 0; | ||
| } | ||
| static int | ||
| ElideMeasureProc(chunkPtr, x) | ||
| TkTextDispChunk *chunkPtr; /* Chunk containing desired coord. */ | ||
| int x; /* X-coordinate, in same coordinate | ||
| * system as chunkPtr->x. */ | ||
| { | ||
| return 0 /*chunkPtr->numBytes - 1*/; | ||
| } | ||
| /* | ||
| *-------------------------------------------------------------- | ||
| * | ||
| * TkTextCharLayoutProc -- | ||
| * | ||
| * This procedure is the "layoutProc" for character segments. | ||
| * | ||
| n * Results: | ||
| * If there is something to display for the chunk then a | ||
| * non-zero value is returned and the fields of chunkPtr | ||
| * will be filled in (see the declaration of TkTextDispChunk | ||
| * in tkText.h for details). If zero is returned it means | ||
| * that no characters from this chunk fit in the window. | ||
| * If -1 is returned it means that this segment just doesn't | ||
| * need to be displayed (never happens for text). | ||
| * | ||
| * Side effects: | ||
| * Memory is allocated to hold additional information about | ||
| * the chunk. | ||
| * | ||
| *-------------------------------------------------------------- | ||
| */ | ||
| int | ||
| TkTextCharLayoutProc(textPtr, indexPtr, segPtr, byteOffset, maxX, maxBytes, | ||
| noCharsYet, wrapMode, chunkPtr) | ||
| TkText *textPtr; /* Text widget being layed out. */ | ||
| TkTextIndex *indexPtr; /* Index of first character to lay out | ||
| * (corresponds to segPtr and offset). */ | ||
| TkTextSegment *segPtr; /* Segment being layed out. */ | ||
| int byteOffset; /* Byte offset within segment of first | ||
| * character to consider. */ | ||
| int maxX; /* Chunk must not occupy pixels at this | ||
| * position or higher. */ | ||
| int maxBytes; /* Chunk must not include more than this | ||
| * many characters. */ | ||
| int noCharsYet; /* Non-zero means no characters have been | ||
| * assigned to this display line yet. */ | ||
| TkWrapMode wrapMode; /* How to handle line wrapping: TEXT_WRAPMODE_CHAR, | ||
| * TEXT_WRAPMODE_NONE, or TEXT_WRAPMODE_WORD. */ | ||
| register TkTextDispChunk *chunkPtr; | ||
| /* Structure to fill in with information | ||
| * about this chunk. The x field has already | ||
| * been set by the caller. */ | ||
| { | ||
| Tk_Font tkfont; | ||
| int nextX, bytesThatFit, count; | ||
| CharInfo *ciPtr; | ||
| char *p; | ||
| TkTextSegment *nextPtr; | ||
| Tk_FontMetrics fm; | ||
| /* | ||
| * Figure out how many characters will fit in the space we've got. | ||
| * Include the next character, even though it won't fit completely, | ||
| * if any of the following is true: | ||
| * (a) the chunk contains no characters and the display line contains | ||
| * no characters yet (i.e. the line isn't wide enough to hold | ||
| * even a single character). | ||
| * (b) at least one pixel of the character is visible, we haven't | ||
| * already exceeded the character limit, and the next character | ||
| * is a white space character. | ||
| */ | ||
| p = segPtr->body.chars + byteOffset; | ||
| tkfont = chunkPtr->stylePtr->sValuePtr->tkfont; | ||
| bytesThatFit = MeasureChars(tkfont, p, maxBytes, chunkPtr->x, maxX, 0, | ||
| &nextX); | ||
| if (bytesThatFit < maxBytes) { | ||
| if ((bytesThatFit == 0) && noCharsYet) { | ||
| Tcl_UniChar ch; | ||
| bytesThatFit = MeasureChars(tkfont, p, Tcl_UtfToUniChar(p, &ch), | ||
| chunkPtr->x, -1, 0, &nextX); | ||
| } | ||
| if ((nextX < maxX) && ((p[bytesThatFit] == ' ') | ||
| || (p[bytesThatFit] == '\t'))) { | ||
| /* | ||
| * Space characters are funny, in that they are considered | ||
| * to fit if there is at least one pixel of space left on the | ||
| * line. Just give the space character whatever space is left. | ||
| */ | ||
| nextX = maxX; | ||
| bytesThatFit++; | ||
| } | ||
| if (p[bytesThatFit] == '\n') { | ||
| /* | ||
| * A newline character takes up no space, so if the previous | ||
| * character fits then so does the newline. | ||
| */ | ||
| bytesThatFit++; | ||
| } | ||
| if (bytesThatFit == 0) { | ||
| return 0; | ||
| } | ||
| } | ||
| Tk_GetFontMetrics(tkfont, &fm); | ||
| /* | ||
| * Fill in the chunk structure and allocate and initialize a | ||
| * CharInfo structure. If the last character is a newline | ||
| * then don't bother to display it. | ||
| */ | ||
| chunkPtr->displayProc = CharDisplayProc; | ||
| chunkPtr->undisplayProc = CharUndisplayProc; | ||
| chunkPtr->measureProc = CharMeasureProc; | ||
| chunkPtr->bboxProc = CharBboxProc; | ||
| chunkPtr->numBytes = bytesThatFit; | ||
| chunkPtr->minAscent = fm.ascent + chunkPtr->stylePtr->sValuePtr->offset; | ||
| chunkPtr->minDescent = fm.descent - chunkPtr->stylePtr->sValuePtr->offset; | ||
| chunkPtr->minHeight = 0; | ||
| chunkPtr->width = nextX - chunkPtr->x; | ||
| chunkPtr->breakIndex = -1; | ||
| ciPtr = (CharInfo *) ckalloc((unsigned) | ||
| (sizeof(CharInfo) - 3 + bytesThatFit)); | ||
| chunkPtr->clientData = (ClientData) ciPtr; | ||
| ciPtr->numBytes = bytesThatFit; | ||
| strncpy(ciPtr->chars, p, (size_t) bytesThatFit); | ||
| if (p[bytesThatFit - 1] == '\n') { | ||
| ciPtr->numBytes--; | ||
| } | ||
| /* | ||
| * Compute a break location. If we're in word wrap mode, a | ||
| * break can occur after any space character, or at the end of | ||
| * the chunk if the next segment (ignoring those with zero size) | ||
| * is not a character segment. | ||
| */ | ||
| if (wrapMode != TEXT_WRAPMODE_WORD) { | ||
| chunkPtr->breakIndex = chunkPtr->numBytes; | ||
| } else { | ||
| for (count = bytesThatFit, p += bytesThatFit - 1; count > 0; | ||
| count--, p--) { | ||
| if (isspace(UCHAR(*p))) { | ||
| chunkPtr->breakIndex = count; | ||
| break; | ||
| } | ||
| } | ||
| if ((bytesThatFit + byteOffset) == segPtr->size) { | ||
| for (nextPtr = segPtr->nextPtr; nextPtr != NULL; | ||
| nextPtr = nextPtr->nextPtr) { | ||
| if (nextPtr->size != 0) { | ||
| if (nextPtr->typePtr != &tkTextCharType) { | ||
| chunkPtr->breakIndex = chunkPtr->numBytes; | ||
| } | ||
| break; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| return 1; | ||
| } | ||
| /* | ||
| *-------------------------------------------------------------- | ||
| * | ||
| * CharDisplayProc -- | ||
| * | ||
| * This procedure is called to display a character chunk on | ||
| * the screen or in an off-screen pixmap. | ||
| * | ||
| * Results: | ||
| * None. | ||
| * | ||
| * Side effects: | ||
| * Graphics are drawn. | ||
| * | ||
| *-------------------------------------------------------------- | ||
| */ | ||
| static void | ||
| CharDisplayProc(chunkPtr, x, y, height, baseline, display, dst, screenY) | ||
| TkTextDispChunk *chunkPtr; /* Chunk that is to be drawn. */ | ||
| int x; /* X-position in dst at which to | ||
| * draw this chunk (may differ from | ||
| * the x-position in the chunk because | ||
| * of scrolling). */ | ||
| int y; /* Y-position at which to draw this | ||
| * chunk in dst. */ | ||
| int height; /* Total height of line. */ | ||
| int baseline; /* Offset of baseline from y. */ | ||
| Display *display; /* Display to use for drawing. */ | ||
| Drawable dst; /* Pixmap or window in which to draw | ||
| * chunk. */ | ||
| int screenY; /* Y-coordinate in text window that | ||
| * corresponds to y. */ | ||
| { | ||
| CharInfo *ciPtr = (CharInfo *) chunkPtr->clientData; | ||
| TextStyle *stylePtr; | ||
| StyleValues *sValuePtr; | ||
| int offsetBytes, offsetX; | ||
| if ((x + chunkPtr->width) <= 0) { | ||
| /* | ||
| * The chunk is off-screen. | ||
| */ | ||
| return; | ||
| } | ||
| stylePtr = chunkPtr->stylePtr; | ||
| sValuePtr = stylePtr->sValuePtr; | ||
| /* | ||
| * If the text sticks out way to the left of the window, skip | ||
| * over the characters that aren't in the visible part of the | ||
| * window. This is essential if x is very negative (such as | ||
| * less than 32K); otherwise overflow problems will occur | ||
| * in servers that use 16-bit arithmetic, like X. | ||
| */ | ||
| offsetX = x; | ||
| offsetBytes = 0; | ||
| if (x < 0) { | ||
| offsetBytes = MeasureChars(sValuePtr->tkfont, ciPtr->chars, | ||
| ciPtr->numBytes, x, 0, x - chunkPtr->x, &offsetX); | ||
| } | ||
| /* | ||
| * Draw the text, underline, and overstrike for this chunk. | ||
| */ | ||
| if (!sValuePtr->elide && (ciPtr->numBytes > offsetBytes) && (stylePtr->fgGC != None)) { | ||
| int numBytes = ciPtr->numBytes - offsetBytes; | ||
| char *string = ciPtr->chars + offsetBytes; | ||
| if ((numBytes > 0) && (string[numBytes - 1] == '\t')) { | ||
| numBytes--; | ||
| } | ||
| Tk_DrawChars(display, dst, stylePtr->fgGC, sValuePtr->tkfont, string, | ||
| numBytes, offsetX, y + baseline - sValuePtr->offset); | ||
| if (sValuePtr->underline) { | ||
| Tk_UnderlineChars(display, dst, stylePtr->fgGC, sValuePtr->tkfont, | ||
| ciPtr->chars + offsetBytes, offsetX, | ||
| y + baseline - sValuePtr->offset, 0, numBytes); | ||
| } | ||
| if (sValuePtr->overstrike) { | ||
| Tk_FontMetrics fm; | ||
| Tk_GetFontMetrics(sValuePtr->tkfont, &fm); | ||
| Tk_UnderlineChars(display, dst, stylePtr->fgGC, sValuePtr->tkfont, | ||
| ciPtr->chars + offsetBytes, offsetX, | ||
| y + baseline - sValuePtr->offset | ||
| - fm.descent - (fm.ascent * 3) / 10, | ||
| 0, numBytes); | ||
| } | ||
| } | ||
| } | ||
| /* | ||
| *-------------------------------------------------------------- | ||
| * | ||
| * CharUndisplayProc -- | ||
| * | ||
| * This procedure is called when a character chunk is no | ||
| * longer going to be displayed. It frees up resources | ||
| * that were allocated to display the chunk. | ||
| * | ||
| * Results: | ||
| * None. | ||
| * | ||
| * Side effects: | ||
| * Memory and other resources get freed. | ||
| * | ||
| *-------------------------------------------------------------- | ||
| */ | ||
| static void | ||
| CharUndisplayProc(textPtr, chunkPtr) | ||
| TkText *textPtr; /* Overall information about text | ||
| * widget. */ | ||
| TkTextDispChunk *chunkPtr; /* Chunk that is about to be freed. */ | ||
| { | ||
| CharInfo *ciPtr = (CharInfo *) chunkPtr->clientData; | ||
| ckfree((char *) ciPtr); | ||
| } | ||
| /* | ||
| *-------------------------------------------------------------- | ||
| * | ||
| * CharMeasureProc -- | ||
| * | ||
| * This procedure is called to determine which character in | ||
| * a character chunk lies over a given x-coordinate. | ||
| * | ||
| * Results: | ||
| * The return value is the index *within the chunk* of the | ||
| * character that covers the position given by "x". | ||
| * | ||
| * Side effects: | ||
| * None. | ||
| * | ||
| *-------------------------------------------------------------- | ||
| */ | ||
| static int | ||
| CharMeasureProc(chunkPtr, x) | ||
| TkTextDispChunk *chunkPtr; /* Chunk containing desired coord. */ | ||
| int x; /* X-coordinate, in same coordinate | ||
| * system as chunkPtr->x. */ | ||
| { | ||
| CharInfo *ciPtr = (CharInfo *) chunkPtr->clientData; | ||
| int endX; | ||
| return MeasureChars(chunkPtr->stylePtr->sValuePtr->tkfont, ciPtr->chars, | ||
| chunkPtr->numBytes - 1, chunkPtr->x, x, 0, &endX); | ||
| /* CHAR OFFSET */ | ||
| } | ||
| /* | ||
| *-------------------------------------------------------------- | ||
| * | ||
| * CharBboxProc -- | ||
| * | ||
| * This procedure is called to compute the bounding box of | ||
| * the area occupied by a single character. | ||
| * | ||
| * Results: | ||
| * There is no return value. *xPtr and *yPtr are filled in | ||
| * with the coordinates of the upper left corner of the | ||
| * character, and *widthPtr and *heightPtr are filled in with | ||
| * the dimensions of the character in pixels. Note: not all | ||
| * of the returned bbox is necessarily visible on the screen | ||
| * (the rightmost part might be off-screen to the right, | ||
| * and the bottommost part might be off-screen to the bottom). | ||
| * | ||
| * Side effects: | ||
| * None. | ||
| * | ||
| *-------------------------------------------------------------- | ||
| */ | ||
| static void | ||
| CharBboxProc(chunkPtr, byteIndex, y, lineHeight, baseline, xPtr, yPtr, | ||
| widthPtr, heightPtr) | ||
| TkTextDispChunk *chunkPtr; /* Chunk containing desired char. */ | ||
| int byteIndex; /* Byte offset of desired character | ||
| * within the chunk. */ | ||
| int y; /* Topmost pixel in area allocated | ||
| * for this line. */ | ||
| int lineHeight; /* Height of line, in pixels. */ | ||
| int baseline; /* Location of line's baseline, in | ||
| * pixels measured down from y. */ | ||
| int *xPtr, *yPtr; /* Gets filled in with coords of | ||
| * character's upper-left pixel. | ||
| * X-coord is in same coordinate | ||
| * system as chunkPtr->x. */ | ||
| int *widthPtr; /* Gets filled in with width of | ||
| * character, in pixels. */ | ||
| int *heightPtr; /* Gets filled in with height of | ||
| * character, in pixels. */ | ||
| { | ||
| CharInfo *ciPtr = (CharInfo *) chunkPtr->clientData; | ||
| int maxX; | ||
| maxX = chunkPtr->width + chunkPtr->x; | ||
| MeasureChars(chunkPtr->stylePtr->sValuePtr->tkfont, ciPtr->chars, | ||
| byteIndex, chunkPtr->x, -1, 0, xPtr); | ||
| if (byteIndex == ciPtr->numBytes) { | ||
| /* | ||
| * This situation only happens if the last character in a line | ||
| * is a space character, in which case it absorbs all of the | ||
| * extra space in the line (see TkTextCharLayoutProc). | ||
| */ | ||
| *widthPtr = maxX - *xPtr; | ||
| } else if ((ciPtr->chars[byteIndex] == '\t') | ||
| && (byteIndex == ciPtr->numBytes - 1)) { | ||
| /* | ||
| * The desired character is a tab character that terminates a | ||
| * chunk; give it all the space left in the chunk. | ||
| */ | ||
| *widthPtr = maxX - *xPtr; | ||
| } else { | ||
| MeasureChars(chunkPtr->stylePtr->sValuePtr->tkfont, | ||
| ciPtr->chars + byteIndex, 1, *xPtr, -1, 0, widthPtr); | ||
| if (*widthPtr > maxX) { | ||
| *widthPtr = maxX - *xPtr; | ||
| } else { | ||
| *widthPtr -= *xPtr; | ||
| } | ||
| } | ||
| *yPtr = y + baseline - chunkPtr->minAscent; | ||
| *heightPtr = chunkPtr->minAscent + chunkPtr->minDescent; | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * AdjustForTab -- | ||
| * | ||
| * This procedure is called to move a series of chunks right | ||
| * in order to align them with a tab stop. | ||
| * | ||
| * Results: | ||
| * None. | ||
| * | ||
| * Side effects: | ||
| * The width of chunkPtr gets adjusted so that it absorbs the | ||
| * extra space due to the tab. The x locations in all the chunks | ||
| * after chunkPtr are adjusted rightward to align with the tab | ||
| * stop given by tabArrayPtr and index. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| static void | ||
| AdjustForTab(textPtr, tabArrayPtr, index, chunkPtr) | ||
| TkText *textPtr; /* Information about the text widget as | ||
| * a whole. */ | ||
| TkTextTabArray *tabArrayPtr; /* Information about the tab stops | ||
| * that apply to this line. May be | ||
| * NULL to indicate default tabbing | ||
| * (every 8 chars). */ | ||
| int index; /* Index of current tab stop. */ | ||
| TkTextDispChunk *chunkPtr; /* Chunk whose last character is | ||
| * the tab; the following chunks | ||
| * contain information to be shifted | ||
| * right. */ | ||
| { | ||
| int x, desired, delta, width, decimal, i, gotDigit; | ||
| TkTextDispChunk *chunkPtr2, *decimalChunkPtr; | ||
| CharInfo *ciPtr; | ||
| int tabX, prev, spaceWidth; | ||
| char *p; | ||
| TkTextTabAlign alignment; | ||
| if (chunkPtr->nextPtr == NULL) { | ||
| /* | ||
| * Nothing after the actual tab; just return. | ||
| */ | ||
| return; | ||
| } | ||
| /* | ||
| * If no tab information has been given, do the usual thing: | ||
| * round up to the next boundary of 8 average-sized characters. | ||
| */ | ||
| x = chunkPtr->nextPtr->x; | ||
| if ((tabArrayPtr == NULL) || (tabArrayPtr->numTabs == 0)) { | ||
| /* | ||
| * No tab information has been given, so use the default | ||
| * interpretation of tabs. | ||
| */ | ||
| desired = NextTabStop(textPtr->tkfont, x, 0); | ||
| goto update; | ||
| } | ||
| if (index < tabArrayPtr->numTabs) { | ||
| alignment = tabArrayPtr->tabs[index].alignment; | ||
| tabX = tabArrayPtr->tabs[index].location; | ||
| } else { | ||
| /* | ||
| * Ran out of tab stops; compute a tab position by extrapolating | ||
| * from the last two tab positions. | ||
| */ | ||
| if (tabArrayPtr->numTabs > 1) { | ||
| prev = tabArrayPtr->tabs[tabArrayPtr->numTabs-2].location; | ||
| } else { | ||
| prev = 0; | ||
| } | ||
| alignment = tabArrayPtr->tabs[tabArrayPtr->numTabs-1].alignment; | ||
| tabX = tabArrayPtr->tabs[tabArrayPtr->numTabs-1].location | ||
| + (index + 1 - tabArrayPtr->numTabs) | ||
| * (tabArrayPtr->tabs[tabArrayPtr->numTabs-1].location - prev); | ||
| } | ||
| if (alignment == LEFT) { | ||
| desired = tabX; | ||
| goto update; | ||
| } | ||
| if ((alignment == CENTER) || (alignment == RIGHT)) { | ||
| /* | ||
| * Compute the width of all the information in the tab group, | ||
| * then use it to pick a desired location. | ||
| */ | ||
| width = 0; | ||
| for (chunkPtr2 = chunkPtr->nextPtr; chunkPtr2 != NULL; | ||
| chunkPtr2 = chunkPtr2->nextPtr) { | ||
| width += chunkPtr2->width; | ||
| } | ||
| if (alignment == CENTER) { | ||
| desired = tabX - width/2; | ||
| } else { | ||
| desired = tabX - width; | ||
| } | ||
| goto update; | ||
| } | ||
| /* | ||
| * Must be numeric alignment. Search through the text to be | ||
| * tabbed, looking for the last , or . before the first character | ||
| * that isn't a number, comma, period, or sign. | ||
| */ | ||
| decimalChunkPtr = NULL; | ||
| decimal = gotDigit = 0; | ||
| for (chunkPtr2 = chunkPtr->nextPtr; chunkPtr2 != NULL; | ||
| chunkPtr2 = chunkPtr2->nextPtr) { | ||
| if (chunkPtr2->displayProc != CharDisplayProc) { | ||
| continue; | ||
| } | ||
| ciPtr = (CharInfo *) chunkPtr2->clientData; | ||
| for (p = ciPtr->chars, i = 0; i < ciPtr->numBytes; p++, i++) { | ||
| if (isdigit(UCHAR(*p))) { | ||
| gotDigit = 1; | ||
| } else if ((*p == '.') || (*p == ',')) { | ||
| decimal = p-ciPtr->chars; | ||
| decimalChunkPtr = chunkPtr2; | ||
| } else if (gotDigit) { | ||
| if (decimalChunkPtr == NULL) { | ||
| decimal = p-ciPtr->chars; | ||
| decimalChunkPtr = chunkPtr2; | ||
| } | ||
| goto endOfNumber; | ||
| } | ||
| } | ||
| } | ||
| endOfNumber: | ||
| if (decimalChunkPtr != NULL) { | ||
| int curX; | ||
| ciPtr = (CharInfo *) decimalChunkPtr->clientData; | ||
| MeasureChars(decimalChunkPtr->stylePtr->sValuePtr->tkfont, | ||
| ciPtr->chars, decimal, decimalChunkPtr->x, -1, 0, &curX); | ||
| desired = tabX - (curX - x); | ||
| goto update; | ||
| } else { | ||
| /* | ||
| * There wasn't a decimal point. Right justify the text. | ||
| */ | ||
| width = 0; | ||
| for (chunkPtr2 = chunkPtr->nextPtr; chunkPtr2 != NULL; | ||
| chunkPtr2 = chunkPtr2->nextPtr) { | ||
| width += chunkPtr2->width; | ||
| } | ||
| desired = tabX - width; | ||
| } | ||
| /* | ||
| * Shift all of the chunks to the right so that the left edge is | ||
| * at the desired location, then expand the chunk containing the | ||
| * tab. Be sure that the tab occupies at least the width of a | ||
| * space character. | ||
| */ | ||
| update: | ||
| delta = desired - x; | ||
| MeasureChars(textPtr->tkfont, " ", 1, 0, -1, 0, &spaceWidth); | ||
| if (delta < spaceWidth) { | ||
| delta = spaceWidth; | ||
| } | ||
| for (chunkPtr2 = chunkPtr->nextPtr; chunkPtr2 != NULL; | ||
| chunkPtr2 = chunkPtr2->nextPtr) { | ||
| chunkPtr2->x += delta; | ||
| } | ||
| chunkPtr->width += delta; | ||
| } | ||
| /* | ||
| *---------------------------------------------------------------------- | ||
| * | ||
| * SizeOfTab -- | ||
| * | ||
| * This returns an estimate of the amount of white space that will | ||
| * be consumed by a tab. | ||
| * | ||
| * Results: | ||
| * The return value is the minimum number of pixels that will | ||
| * be occupied by the index'th tab of tabArrayPtr, assuming that | ||
| * the current position on the line is x and the end of the | ||
| * line is maxX. For numeric tabs, this is a conservative | ||
| * estimate. The return value is always >= 0. | ||
| * | ||
| * Side effects: | ||
| * None. | ||
| * | ||
| *---------------------------------------------------------------------- | ||
| */ | ||
| static int | ||
| SizeOfTab(textPtr, tabArrayPtr, index, x, maxX) | ||
| TkText *textPtr; /* Information about the text widget as | ||
| * a whole. */ | ||
| TkTextTabArray *tabArrayPtr; /* Information about the tab stops | ||
| * that apply to this line. NULL | ||
| * means use default tabbing (every | ||
| * 8 chars.) */ | ||
| int index; /* Index of current tab stop. */ | ||
| int x; /* Current x-location in line. Only | ||
| * used if tabArrayPtr == NULL. */ | ||
| int maxX; /* X-location of pixel just past the | ||
| * right edge of the line. */ | ||
| { | ||
| int tabX, prev, result, spaceWidth; | ||
| TkTextTabAlign alignment; | ||
| if ((tabArrayPtr == NULL) || (tabArrayPtr->numTabs == 0)) { | ||
| tabX = NextTabStop(textPtr->tkfont, x, 0); | ||
| return tabX - x; | ||
| } | ||
| if (index < tabArrayPtr->numTabs) { | ||
| tabX = tabArrayPtr->tabs[index].location; | ||
| alignment = tabArrayPtr->tabs[index].alignment; | ||
| } else { | ||
| /* | ||
| * Ran out of tab stops; compute a tab position by extrapolating | ||
| * from the last two tab positions. | ||
| */ | ||
| if (tabArrayPtr->numTabs > 1) { | ||
| prev = tabArrayPtr->tabs[tabArrayPtr->numTabs-2].location; | ||
| } else { | ||
| prev = 0; | ||
| } | ||
| tabX = tabArrayPtr->tabs[tabArrayPtr->numTabs-1].location | ||
| + (index + 1 - tabArrayPtr->numTabs) | ||
| * (tabArrayPtr->tabs[tabArrayPtr->numTabs-1].location - prev); | ||
| alignment = tabArrayPtr->tabs[tabArrayPtr->numTabs-1].alignment; | ||
| } | ||
| if (alignment == CENTER) { | ||
| /* | ||
| * Be very careful in the arithmetic below, because maxX may | ||
| * be the largest positive number: watch out for integer | ||
| * overflow. | ||
| */ | ||
| if ((maxX-tabX) < (tabX - x)) { | ||
| result = (maxX - x) - 2*(maxX - tabX); | ||
| } else { | ||
| result = 0; | ||
| } | ||
| goto done; | ||
| } | ||
| if (alignment == RIGHT) { | ||
| result = 0; | ||
| goto done; | ||
| } | ||
| /* | ||
| * Note: this treats NUMERIC alignment the same as LEFT | ||
| * alignment, which is somewhat conservative. However, it's | ||
| * pretty tricky at this point to figure out exactly where | ||
| * the damn decimal point will be. | ||
| */ | ||
| if (tabX > x) { | ||
| result = tabX - x; | ||
| } else { | ||
| result = 0; | ||
| } | ||
| done: | ||
| MeasureChars(textPtr->tkfont, " ", 1, 0, -1, 0, &spaceWidth); | ||
| if (result < spaceWidth) { | ||
| result = spaceWidth; | ||
| } | ||
| return result; | ||
| } | ||
| /* | ||
| *--------------------------------------------------------------------------- | ||
| * | ||
| * NextTabStop -- | ||
| * | ||
| * Given the current position, determine where the next default | ||
| * tab stop would be located. This procedure is called when the | ||
| * current chunk in the text has no tabs defined and so the default | ||
| * tab spacing for the font should be used. | ||
| * | ||
| * Results: | ||
| * The location in pixels of the next tab stop. | ||
| * | ||
| * Side effects: | ||
| * None. | ||
| * | ||
| *--------------------------------------------------------------------------- | ||
| */ | ||
| static int | ||
| NextTabStop(tkfont, x, tabOrigin) | ||
| Tk_Font tkfont; /* Font in which chunk that contains tab | ||
| * stop will be drawn. */ | ||
| int x; /* X-position in pixels where last | ||
| * character was drawn. The next tab stop | ||
| * occurs somewhere after this location. */ | ||
| int tabOrigin; /* The origin for tab stops. May be | ||
| * non-zero if text has been scrolled. */ | ||
| { | ||
| int tabWidth, rem; | ||
| tabWidth = Tk_TextWidth(tkfont, "0", 1) * 8; | ||
| if (tabWidth == 0) { | ||
| tabWidth = 1; | ||
| } | ||
| x += tabWidth; | ||
| rem = (x - tabOrigin) % tabWidth; | ||
| if (rem < 0) { | ||
| rem += tabWidth; | ||
| } | ||
| x -= rem; | ||
| return x; | ||
| } | ||
| /* | ||
| *--------------------------------------------------------------------------- | ||
| * | ||
| * MeasureChars -- | ||
| * | ||
| * Determine the number of characters from the string that will fit | ||
| * in the given horizontal span. The measurement is done under the | ||
| * assumption that Tk_DrawTextLayout will be used to actually display | ||
| * the characters. | ||
| * | ||
| * If tabs are encountered in the string, they will be expanded | ||
| * to the next tab stop, unless the TK_IGNORE_TABS flag is specified. | ||
| * | ||
| * If a newline is encountered in the string, the line will be | ||
| * broken at that point, unless the TK_NEWSLINES_NOT_SPECIAL flag | ||
| * is specified. | ||
| * | ||
| * Results: | ||
| * The return value is the number of bytes from source | ||
| * that fit in the span given by startX and maxX. *nextXPtr | ||
| * is filled in with the x-coordinate at which the first | ||
| * character that didn't fit would be drawn, if it were to | ||
| * be drawn. | ||
| * | ||
| * Side effects: | ||
| * None. | ||
| * | ||
| *-------------------------------------------------------------- | ||
| */ | ||
| static int | ||
| MeasureChars(tkfont, source, maxBytes, startX, maxX, tabOrigin, nextXPtr) | ||
| Tk_Font tkfont; /* Font in which to draw characters. */ | ||
| CONST char *source; /* Characters to be displayed. Need not | ||
| * be NULL-terminated. */ | ||
| int maxBytes; /* Maximum # of bytes to consider from | ||
| * source. */ | ||
| int startX; /* X-position at which first character will | ||
| * be drawn. */ | ||
| int maxX; /* Don't consider any character that would | ||
| * cross this x-position. */ | ||
| int tabOrigin; /* X-location that serves as "origin" for | ||
| * tab stops. */ | ||
| int *nextXPtr; /* Return x-position of terminating | ||
| * character here. */ | ||
| { | ||
| int curX, width, ch; | ||
| CONST char *special, *end, *start; | ||
| ch = 0; /* lint. */ | ||
| curX = startX; | ||
| special = source; | ||
| end = source + maxBytes; | ||
| for (start = source; start < end; ) { | ||
| if (start >= special) { | ||
| /* | ||
| * Find the next special character in the string. | ||
| */ | ||
| for (special = start; special < end; special++) { | ||
| ch = *special; | ||
| if ((ch == '\t') || (ch == '\n')) { | ||
| break; | ||
| } | ||
| } | ||
| } | ||
| /* | ||
| * Special points at the next special character (or the end of the | ||
| * string). Process characters between start and special. | ||
| */ | ||
| if ((maxX >= 0) && (curX >= maxX)) { | ||
| break; | ||
| } | ||
| start += Tk_MeasureChars(tkfont, start, special - start, maxX - curX, | ||
| 0, &width); | ||
| curX += width; | ||
| if (start < special) { | ||
| /* | ||
| * No more chars fit in line. | ||
| */ | ||
| break; | ||
| } | ||
| if (special < end) { | ||
| if (ch == '\t') { | ||
| start++; | ||
| } else { | ||
| break; | ||
| } | ||
| } | ||
| } | ||
| *nextXPtr = curX; | ||
| return start - source; | ||
| } | ||
| /* $History: tkTextDisp.c $ | ||
| * | ||
| * ***************** Version 1 ***************** | ||
| * User: Dtashley Date: 1/02/01 Time: 3:07a | ||
| * Created in $/IjuScripter, IjuConsole/Source/Tk Base | ||
| * Initial check-in. | ||
| */ | ||
| /* End of TKTEXTDISP.C */ | ||
| 1 | /* $Header$ */ | |
| 2 | ||
| 3 | /* | |
| 4 | * tkTextDisp.c -- | |
| 5 | * | |
| 6 | * This module provides facilities to display text widgets. It is | |
| 7 | * the only place where information is kept about the screen layout | |
| 8 | * of text widgets. | |
| 9 | * | |
| 10 | * Copyright (c) 1992-1994 The Regents of the University of California. | |
| 11 | * Copyright (c) 1994-1997 Sun Microsystems, Inc. | |
| 12 | * | |
| 13 | * See the file "license.terms" for information on usage and redistribution | |
| 14 | * of this file, and for a DISCLAIMER OF ALL WARRANTIES. | |
| 15 | * | |
| 16 | * RCS: @(#) $Id: tktextdisp.c,v 1.1.1.1 2001/06/13 05:10:16 dtashley Exp $ | |
| 17 | */ | |
| 18 | ||
| 19 | #include "tkPort.h" | |
| 20 | #include "tkInt.h" | |
| 21 | #include "tkText.h" | |
| 22 | ||
| 23 | #ifdef __WIN32__ | |
| 24 | #include "tkWinInt.h" | |
| 25 | #endif | |
| 26 | ||
| 27 | /* | |
| 28 | * The following structure describes how to display a range of characters. | |
| 29 | * The information is generated by scanning all of the tags associated | |
| 30 | * with the characters and combining that with default information for | |
| 31 | * the overall widget. These structures form the hash keys for | |
| 32 | * dInfoPtr->styleTable. | |
| 33 | */ | |
| 34 | ||
| 35 | typedef struct StyleValues { | |
| 36 | Tk_3DBorder border; /* Used for drawing background under text. | |
| 37 | * NULL means use widget background. */ | |
| 38 | int borderWidth; /* Width of 3-D border for background. */ | |
| 39 | int relief; /* 3-D relief for background. */ | |
| 40 | Pixmap bgStipple; /* Stipple bitmap for background. None | |
| 41 | * means draw solid. */ | |
| 42 | XColor *fgColor; /* Foreground color for text. */ | |
| 43 | Tk_Font tkfont; /* Font for displaying text. */ | |
| 44 | Pixmap fgStipple; /* Stipple bitmap for text and other | |
| 45 | * foreground stuff. None means draw | |
| 46 | * solid.*/ | |
| 47 | int justify; /* Justification style for text. */ | |
| 48 | int lMargin1; /* Left margin, in pixels, for first display | |
| 49 | * line of each text line. */ | |
| 50 | int lMargin2; /* Left margin, in pixels, for second and | |
| 51 | * later display lines of each text line. */ | |
| 52 | int offset; /* Offset in pixels of baseline, relative to | |
| 53 | * baseline of line. */ | |
| 54 | int overstrike; /* Non-zero means draw overstrike through | |
| 55 | * text. */ | |
| 56 | int rMargin; /* Right margin, in pixels. */ | |
| 57 | int spacing1; /* Spacing above first dline in text line. */ | |
| 58 | int spacing2; /* Spacing between lines of dline. */ | |
| 59 | int spacing3; /* Spacing below last dline in text line. */ | |
| 60 | TkTextTabArray *tabArrayPtr;/* Locations and types of tab stops (may | |
| 61 | * be NULL). */ | |
| 62 | int underline; /* Non-zero means draw underline underneath | |
| 63 | * text. */ | |
| 64 | int elide; /* Non-zero means draw text */ | |
| 65 | TkWrapMode wrapMode; /* How to handle wrap-around for this tag. | |
| 66 | * One of TEXT_WRAPMODE_CHAR, | |
| 67 | * TEXT_WRAPMODE_NONE or TEXT_WRAPMODE_WORD.*/ | |
| 68 | } StyleValues; | |
| 69 | ||
| 70 | /* | |
| 71 | * The following structure extends the StyleValues structure above with | |
| 72 | * graphics contexts used to actually draw the characters. The entries | |
| 73 | * in dInfoPtr->styleTable point to structures of this type. | |
| 74 | */ | |
| 75 | ||
| 76 | typedef struct TextStyle { | |
| 77 | int refCount; /* Number of times this structure is | |
| 78 | * referenced in Chunks. */ | |
| 79 | GC bgGC; /* Graphics context for background. None | |
| 80 | * means use widget background. */ | |
| 81 | GC fgGC; /* Graphics context for foreground. */ | |
| 82 | StyleValues *sValuePtr; /* Raw information from which GCs were | |
| 83 | * derived. */ | |
| 84 | Tcl_HashEntry *hPtr; /* Pointer to entry in styleTable. Used | |
| 85 | * to delete entry. */ | |
| 86 | } TextStyle; | |
| 87 | ||
| 88 | /* | |
| 89 | * The following macro determines whether two styles have the same | |
| 90 | * background so that, for example, no beveled border should be drawn | |
| 91 | * between them. | |
| 92 | */ | |
| 93 | ||
| 94 | #define SAME_BACKGROUND(s1, s2) \ | |
| 95 | (((s1)->sValuePtr->border == (s2)->sValuePtr->border) \ | |
| 96 | && ((s1)->sValuePtr->borderWidth == (s2)->sValuePtr->borderWidth) \ | |
| 97 | && ((s1)->sValuePtr->relief == (s2)->sValuePtr->relief) \ | |
| 98 | && ((s1)->sValuePtr->bgStipple == (s2)->sValuePtr->bgStipple)) | |
| 99 | ||
| 100 | /* | |
| 101 | * The following structure describes one line of the display, which may | |
| 102 | * be either part or all of one line of the text. | |
| 103 | */ | |
| 104 | ||
| 105 | typedef struct DLine { | |
| 106 | TkTextIndex index; /* Identifies first character in text | |
| 107 | * that is displayed on this line. */ | |
| 108 | int byteCount; /* Number of bytes accounted for by this | |
| 109 | * display line, including a trailing space | |
| 110 | * or newline that isn't actually displayed. */ | |
| 111 | int y; /* Y-position at which line is supposed to | |
| 112 | * be drawn (topmost pixel of rectangular | |
| 113 | * area occupied by line). */ | |
| 114 | int oldY; /* Y-position at which line currently | |
| 115 | * appears on display. -1 means line isn't | |
| 116 | * currently visible on display and must be | |
| 117 | * redrawn. This is used to move lines by | |
| 118 | * scrolling rather than re-drawing. */ | |
| 119 | int height; /* Height of line, in pixels. */ | |
| 120 | int baseline; /* Offset of text baseline from y, in | |
| 121 | * pixels. */ | |
| 122 | int spaceAbove; /* How much extra space was added to the | |
| 123 | * top of the line because of spacing | |
| 124 | * options. This is included in height | |
| 125 | * and baseline. */ | |
| 126 | int spaceBelow; /* How much extra space was added to the | |
| 127 | * bottom of the line because of spacing | |
| 128 | * options. This is included in height. */ | |
| 129 | int length; /* Total length of line, in pixels. */ | |
| 130 | TkTextDispChunk *chunkPtr; /* Pointer to first chunk in list of all | |
| 131 | * of those that are displayed on this | |
| 132 | * line of the screen. */ | |
| 133 | struct DLine *nextPtr; /* Next in list of all display lines for | |
| 134 | * this window. The list is sorted in | |
| 135 | * order from top to bottom. Note: the | |
| 136 | * next DLine doesn't always correspond | |
| 137 | * to the next line of text: (a) can have | |
| 138 | * multiple DLines for one text line, and | |
| 139 | * (b) can have gaps where DLine's have been | |
| 140 | * deleted because they're out of date. */ | |
| 141 | int flags; /* Various flag bits: see below for values. */ | |
| 142 | } DLine; | |
| 143 | ||
| 144 | /* | |
| 145 | * Flag bits for DLine structures: | |
| 146 | * | |
| 147 | * HAS_3D_BORDER - Non-zero means that at least one of the | |
| 148 | * chunks in this line has a 3D border, so | |
| 149 | * it potentially interacts with 3D borders | |
| 150 | * in neighboring lines (see | |
| 151 | * DisplayLineBackground). | |
| 152 | * NEW_LAYOUT - Non-zero means that the line has been | |
| 153 | * re-layed out since the last time the | |
| 154 | * display was updated. | |
| 155 | * TOP_LINE - Non-zero means that this was the top line | |
| 156 | * in the window the last time that the window | |
| 157 | * was laid out. This is important because | |
| 158 | * a line may be displayed differently if its | |
| 159 | * at the top or bottom than if it's in the | |
| 160 | * middle (e.g. beveled edges aren't displayed | |
| 161 | * for middle lines if the adjacent line has | |
| 162 | * a similar background). | |
| 163 | * BOTTOM_LINE - Non-zero means that this was the bottom line | |
| 164 | * in the window the last time that the window | |
| 165 | * was laid out. | |
| 166 | * IS_DISABLED - This Dline cannot be edited. | |
| 167 | */ | |
| 168 | ||
| 169 | #define HAS_3D_BORDER 1 | |
| 170 | #define NEW_LAYOUT 2 | |
| 171 | #define TOP_LINE 4 | |
| 172 | #define BOTTOM_LINE 8 | |
| 173 | #define IS_DISABLED 16 | |
| 174 | ||
| 175 | /* | |
| 176 | * Overall display information for a text widget: | |
| 177 | */ | |
| 178 | ||
| 179 | typedef struct TextDInfo { | |
| 180 | Tcl_HashTable styleTable; /* Hash table that maps from StyleValues | |
| 181 | * to TextStyles for this widget. */ | |
| 182 | DLine *dLinePtr; /* First in list of all display lines for | |
| 183 | * this widget, in order from top to bottom. */ | |
| 184 | GC copyGC; /* Graphics context for copying from off- | |
| 185 | * screen pixmaps onto screen. */ | |
| 186 | GC scrollGC; /* Graphics context for copying from one place | |
| 187 | * in the window to another (scrolling): | |
| 188 | * differs from copyGC in that we need to get | |
| 189 | * GraphicsExpose events. */ | |
| 190 | int x; /* First x-coordinate that may be used for | |
| 191 | * actually displaying line information. | |
| 192 | * Leaves space for border, etc. */ | |
| 193 | int y; /* First y-coordinate that may be used for | |
| 194 | * actually displaying line information. | |
| 195 | * Leaves space for border, etc. */ | |
| 196 | int maxX; /* First x-coordinate to right of available | |
| 197 | * space for displaying lines. */ | |
| 198 | int maxY; /* First y-coordinate below available | |
| 199 | * space for displaying lines. */ | |
| 200 | int topOfEof; /* Top-most pixel (lowest y-value) that has | |
| 201 | * been drawn in the appropriate fashion for | |
| 202 | * the portion of the window after the last | |
| 203 | * line of the text. This field is used to | |
| 204 | * figure out when to redraw part or all of | |
| 205 | * the eof field. */ | |
| 206 | ||
| 207 | /* | |
| 208 | * Information used for scrolling: | |
| 209 | */ | |
| 210 | ||
| 211 | int newByteOffset; /* Desired x scroll position, measured as the | |
| 212 | * number of average-size characters off-screen | |
| 213 | * to the left for a line with no left | |
| 214 | * margin. */ | |
| 215 | int curPixelOffset; /* Actual x scroll position, measured as the | |
| 216 | * number of pixels off-screen to the left. */ | |
| 217 | int maxLength; /* Length in pixels of longest line that's | |
| 218 | * visible in window (length may exceed window | |
| 219 | * size). If there's no wrapping, this will | |
| 220 | * be zero. */ | |
| 221 | double xScrollFirst, xScrollLast; | |
| 222 | /* Most recent values reported to horizontal | |
| 223 | * scrollbar; used to eliminate unnecessary | |
| 224 | * reports. */ | |
| 225 | double yScrollFirst, yScrollLast; | |
| 226 | /* Most recent values reported to vertical | |
| 227 | * scrollbar; used to eliminate unnecessary | |
| 228 | * reports. */ | |
| 229 | ||
| 230 | /* | |
| 231 | * The following information is used to implement scanning: | |
| 232 | */ | |
| 233 | ||
| 234 | int scanMarkIndex; /* Byte index of character that was at the | |
| 235 | * left edge of the window when the scan | |
| 236 | * started. */ | |
| 237 | int scanMarkX; /* X-position of mouse at time scan started. */ | |
| 238 | int scanTotalScroll; /* Total scrolling (in screen lines) that has | |
| 239 | * occurred since scanMarkY was set. */ | |
| 240 | int scanMarkY; /* Y-position of mouse at time scan started. */ | |
| 241 | ||
| 242 | /* | |
| 243 | * Miscellaneous information: | |
| 244 | */ | |
| 245 | ||
| 246 | int dLinesInvalidated; /* This value is set to 1 whenever something | |
| 247 | * happens that invalidates information in | |
| 248 | * DLine structures; if a redisplay | |
| 249 | * is in progress, it will see this and | |
| 250 | * abort the redisplay. This is needed | |
| 251 | * because, for example, an embedded window | |
| 252 | * could change its size when it is first | |
| 253 | * displayed, invalidating the DLine that | |
| 254 | * is currently being displayed. If redisplay | |
| 255 | * continues, it will use freed memory and | |
| 256 | * could dump core. */ | |
| 257 | int flags; /* Various flag values: see below for | |
| 258 | * definitions. */ | |
| 259 | } TextDInfo; | |
| 260 | ||
| 261 | /* | |
| 262 | * In TkTextDispChunk structures for character segments, the clientData | |
| 263 | * field points to one of the following structures: | |
| 264 | */ | |
| 265 | ||
| 266 | typedef struct CharInfo { | |
| 267 | int numBytes; /* Number of bytes to display. */ | |
| 268 | char chars[4]; /* UTF characters to display. Actual size | |
| 269 | * will be numBytes, not 4. THIS MUST BE | |
| 270 | * THE LAST FIELD IN THE STRUCTURE. */ | |
| 271 | } CharInfo; | |
| 272 | ||
| 273 | /* | |
| 274 | * Flag values for TextDInfo structures: | |
| 275 | * | |
| 276 | * DINFO_OUT_OF_DATE: Non-zero means that the DLine structures | |
| 277 | * for this window are partially or completely | |
| 278 | * out of date and need to be recomputed. | |
| 279 | * REDRAW_PENDING: Means that a when-idle handler has been | |
| 280 | * scheduled to update the display. | |
| 281 | * REDRAW_BORDERS: Means window border or pad area has | |
| 282 | * potentially been damaged and must be redrawn. | |
| 283 | * REPICK_NEEDED: 1 means that the widget has been modified | |
| 284 | * in a way that could change the current | |
| 285 | * character (a different character might be | |
| 286 | * under the mouse cursor now). Need to | |
| 287 | * recompute the current character before | |
| 288 | * the next redisplay. | |
| 289 | */ | |
| 290 | ||
| 291 | #define DINFO_OUT_OF_DATE 1 | |
| 292 | #define REDRAW_PENDING 2 | |
| 293 | #define REDRAW_BORDERS 4 | |
| 294 | #define REPICK_NEEDED 8 | |
| 295 | ||
| 296 | /* | |
| 297 | * The following counters keep statistics about redisplay that can be | |
| 298 | * checked to see how clever this code is at reducing redisplays. | |
| 299 | */ | |
| 300 | ||
| 301 | static int numRedisplays; /* Number of calls to DisplayText. */ | |
| 302 | static int linesRedrawn; /* Number of calls to DisplayDLine. */ | |
| 303 | static int numCopies; /* Number of calls to XCopyArea to copy part | |
| 304 | * of the screen. */ | |
| 305 | ||
| 306 | /* | |
| 307 | * Forward declarations for procedures defined later in this file: | |
| 308 | */ | |
| 309 | ||
| 310 | static void AdjustForTab _ANSI_ARGS_((TkText *textPtr, | |
| 311 | TkTextTabArray *tabArrayPtr, int index, | |
| 312 | TkTextDispChunk *chunkPtr)); | |
| 313 | static void CharBboxProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr, | |
| 314 | int index, int y, int lineHeight, int baseline, | |
| 315 | int *xPtr, int *yPtr, int *widthPtr, | |
| 316 | int *heightPtr)); | |
| 317 | static void CharDisplayProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr, | |
| 318 | int x, int y, int height, int baseline, | |
| 319 | Display *display, Drawable dst, int screenY)); | |
| 320 | static int CharMeasureProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr, | |
| 321 | int x)); | |
| 322 | static void CharUndisplayProc _ANSI_ARGS_((TkText *textPtr, | |
| 323 | TkTextDispChunk *chunkPtr)); | |
| 324 | ||
| 325 | /* | |
| 326 | Definitions of elided procs. | |
| 327 | Compiler can't inline these since we use pointers to these functions. | |
| 328 | ElideDisplayProc, ElideUndisplayProc special-cased for speed, | |
| 329 | as potentially many elided DLine chunks if large, tag toggle-filled | |
| 330 | elided region. | |
| 331 | */ | |
| 332 | static void ElideBboxProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr, | |
| 333 | int index, int y, int lineHeight, int baseline, | |
| 334 | int *xPtr, int *yPtr, int *widthPtr, | |
| 335 | int *heightPtr)); | |
| 336 | static int ElideMeasureProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr, | |
| 337 | int x)); | |
| 338 | ||
| 339 | static void DisplayDLine _ANSI_ARGS_((TkText *textPtr, | |
| 340 | DLine *dlPtr, DLine *prevPtr, Pixmap pixmap)); | |
| 341 | static void DisplayLineBackground _ANSI_ARGS_((TkText *textPtr, | |
| 342 | DLine *dlPtr, DLine *prevPtr, Pixmap pixmap)); | |
| 343 | static void DisplayText _ANSI_ARGS_((ClientData clientData)); | |
| 344 | static DLine * FindDLine _ANSI_ARGS_((DLine *dlPtr, | |
| 345 | TkTextIndex *indexPtr)); | |
| 346 | static void FreeDLines _ANSI_ARGS_((TkText *textPtr, | |
| 347 | DLine *firstPtr, DLine *lastPtr, int unlink)); | |
| 348 | static void FreeStyle _ANSI_ARGS_((TkText *textPtr, | |
| 349 | TextStyle *stylePtr)); | |
| 350 | static TextStyle * GetStyle _ANSI_ARGS_((TkText *textPtr, | |
| 351 | TkTextIndex *indexPtr)); | |
| 352 | static void GetXView _ANSI_ARGS_((Tcl_Interp *interp, | |
| 353 | TkText *textPtr, int report)); | |
| 354 | static void GetYView _ANSI_ARGS_((Tcl_Interp *interp, | |
| 355 | TkText *textPtr, int report)); | |
| 356 | static DLine * LayoutDLine _ANSI_ARGS_((TkText *textPtr, | |
| 357 | TkTextIndex *indexPtr)); | |
| 358 | static int MeasureChars _ANSI_ARGS_((Tk_Font tkfont, | |
| 359 | CONST char *source, int maxBytes, int startX, | |
| 360 | int maxX, int tabOrigin, int *nextXPtr)); | |
| 361 | static void MeasureUp _ANSI_ARGS_((TkText *textPtr, | |
| 362 | TkTextIndex *srcPtr, int distance, | |
| 363 | TkTextIndex *dstPtr)); | |
| 364 | static int NextTabStop _ANSI_ARGS_((Tk_Font tkfont, int x, | |
| 365 | int tabOrigin)); | |
| 366 | static void UpdateDisplayInfo _ANSI_ARGS_((TkText *textPtr)); | |
| 367 | static void ScrollByLines _ANSI_ARGS_((TkText *textPtr, | |
| 368 | int offset)); | |
| 369 | static int SizeOfTab _ANSI_ARGS_((TkText *textPtr, | |
| 370 | TkTextTabArray *tabArrayPtr, int index, int x, | |
| 371 | int maxX)); | |
| 372 | static void TextInvalidateRegion _ANSI_ARGS_((TkText *textPtr, | |
| 373 | TkRegion region)); | |
| 374 | ||
| 375 | ||
| 376 | /* | |
| 377 | *---------------------------------------------------------------------- | |
| 378 | * | |
| 379 | * TkTextCreateDInfo -- | |
| 380 | * | |
| 381 | * This procedure is called when a new text widget is created. | |
| 382 | * Its job is to set up display-related information for the widget. | |
| 383 | * | |
| 384 | * Results: | |
| 385 | * None. | |
| 386 | * | |
| 387 | * Side effects: | |
| 388 | * A TextDInfo data structure is allocated and initialized and attached | |
| 389 | * to textPtr. | |
| 390 | * | |
| 391 | *---------------------------------------------------------------------- | |
| 392 | */ | |
| 393 | ||
| 394 | void | |
| 395 | TkTextCreateDInfo(textPtr) | |
| 396 | TkText *textPtr; /* Overall information for text widget. */ | |
| 397 | { | |
| 398 | register TextDInfo *dInfoPtr; | |
| 399 | XGCValues gcValues; | |
| 400 | ||
| 401 | dInfoPtr = (TextDInfo *) ckalloc(sizeof(TextDInfo)); | |
| 402 | Tcl_InitHashTable(&dInfoPtr->styleTable, sizeof(StyleValues)/sizeof(int)); | |
| 403 | dInfoPtr->dLinePtr = NULL; | |
| 404 | dInfoPtr->copyGC = None; | |
| 405 | gcValues.graphics_exposures = True; | |
| 406 | dInfoPtr->scrollGC = Tk_GetGC(textPtr->tkwin, GCGraphicsExposures, | |
| 407 | &gcValues); | |
| 408 | dInfoPtr->topOfEof = 0; | |
| 409 | dInfoPtr->newByteOffset = 0; | |
| 410 | dInfoPtr->curPixelOffset = 0; | |
| 411 | dInfoPtr->maxLength = 0; | |
| 412 | dInfoPtr->xScrollFirst = -1; | |
| 413 | dInfoPtr->xScrollLast = -1; | |
| 414 | dInfoPtr->yScrollFirst = -1; | |
| 415 | dInfoPtr->yScrollLast = -1; | |
| 416 | dInfoPtr->scanMarkIndex = 0; | |
| 417 | dInfoPtr->scanMarkX = 0; | |
| 418 | dInfoPtr->scanTotalScroll = 0; | |
| 419 | dInfoPtr->scanMarkY = 0; | |
| 420 | dInfoPtr->dLinesInvalidated = 0; | |
| 421 | dInfoPtr->flags = DINFO_OUT_OF_DATE; | |
| 422 | textPtr->dInfoPtr = dInfoPtr; | |
| 423 | } | |
| 424 | ||
| 425 | /* | |
| 426 | *---------------------------------------------------------------------- | |
| 427 | * | |
| 428 | * TkTextFreeDInfo -- | |
| 429 | * | |
| 430 | * This procedure is called to free up all of the private display | |
| 431 | * information kept by this file for a text widget. | |
| 432 | * | |
| 433 | * Results: | |
| 434 | * None. | |
| 435 | * | |
| 436 | * Side effects: | |
| 437 | * Lots of resources get freed. | |
| 438 | * | |
| 439 | *---------------------------------------------------------------------- | |
| 440 | */ | |
| 441 | ||
| 442 | void | |
| 443 | TkTextFreeDInfo(textPtr) | |
| 444 | TkText *textPtr; /* Overall information for text widget. */ | |
| 445 | { | |
| 446 | register TextDInfo *dInfoPtr = textPtr->dInfoPtr; | |
| 447 | ||
| 448 | /* | |
| 449 | * Be careful to free up styleTable *after* freeing up all the | |
| 450 | * DLines, so that the hash table is still intact to free up the | |
| 451 | * style-related information from the lines. Once the lines are | |
| 452 | * all free then styleTable will be empty. | |
| 453 | */ | |
| 454 | ||
| 455 | FreeDLines(textPtr, dInfoPtr->dLinePtr, (DLine *) NULL, 1); | |
| 456 | Tcl_DeleteHashTable(&dInfoPtr->styleTable); | |
| 457 | if (dInfoPtr->copyGC != None) { | |
| 458 | Tk_FreeGC(textPtr->display, dInfoPtr->copyGC); | |
| 459 | } | |
| 460 | Tk_FreeGC(textPtr->display, dInfoPtr->scrollGC); | |
| 461 | if (dInfoPtr->flags & REDRAW_PENDING) { | |
| 462 | Tcl_CancelIdleCall(DisplayText, (ClientData) textPtr); | |
| 463 | } | |
| 464 | ckfree((char *) dInfoPtr); | |
| 465 | } | |
| 466 | ||
| 467 | /* | |
| 468 | *---------------------------------------------------------------------- | |
| 469 | * | |
| 470 | * GetStyle -- | |
| 471 | * | |
| 472 | * This procedure creates all the information needed to display | |
| 473 | * text at a particular location. | |
| 474 | * | |
| 475 | * Results: | |
| 476 | * The return value is a pointer to a TextStyle structure that | |
| 477 | * corresponds to *sValuePtr. | |
| 478 | * | |
| 479 | * Side effects: | |
| 480 | * A new entry may be created in the style table for the widget. | |
| 481 | * | |
| 482 | *---------------------------------------------------------------------- | |
| 483 | */ | |
| 484 | ||
| 485 | static TextStyle * | |
| 486 | GetStyle(textPtr, indexPtr) | |
| 487 | TkText *textPtr; /* Overall information about text widget. */ | |
| 488 | TkTextIndex *indexPtr; /* The character in the text for which | |
| 489 | * display information is wanted. */ | |
| 490 | { | |
| 491 | TkTextTag **tagPtrs; | |
| 492 | register TkTextTag *tagPtr; | |
| 493 | StyleValues styleValues; | |
| 494 | TextStyle *stylePtr; | |
| 495 | Tcl_HashEntry *hPtr; | |
| 496 | int numTags, new, i; | |
| 497 | XGCValues gcValues; | |
| 498 | unsigned long mask; | |
| 499 | ||
| 500 | /* | |
| 501 | * The variables below keep track of the highest-priority specification | |
| 502 | * that has occurred for each of the various fields of the StyleValues. | |
| 503 | */ | |
| 504 | ||
| 505 | int borderPrio, borderWidthPrio, reliefPrio, bgStipplePrio; | |
| 506 | int fgPrio, fontPrio, fgStipplePrio; | |
| 507 | int underlinePrio, elidePrio, justifyPrio, offsetPrio; | |
| 508 | int lMargin1Prio, lMargin2Prio, rMarginPrio; | |
| 509 | int spacing1Prio, spacing2Prio, spacing3Prio; | |
| 510 | int overstrikePrio, tabPrio, wrapPrio; | |
| 511 | ||
| 512 | /* | |
| 513 | * Find out what tags are present for the character, then compute | |
| 514 | * a StyleValues structure corresponding to those tags (scan | |
| 515 | * through all of the tags, saving information for the highest- | |
| 516 | * priority tag). | |
| 517 | */ | |
| 518 | ||
| 519 | tagPtrs = TkBTreeGetTags(indexPtr, &numTags); | |
| 520 | borderPrio = borderWidthPrio = reliefPrio = bgStipplePrio = -1; | |
| 521 | fgPrio = fontPrio = fgStipplePrio = -1; | |
| 522 | underlinePrio = elidePrio = justifyPrio = offsetPrio = -1; | |
| 523 | lMargin1Prio = lMargin2Prio = rMarginPrio = -1; | |
| 524 | spacing1Prio = spacing2Prio = spacing3Prio = -1; | |
| 525 | overstrikePrio = tabPrio = wrapPrio = -1; | |
| 526 | memset((VOID *) &styleValues, 0, sizeof(StyleValues)); | |
| 527 | styleValues.relief = TK_RELIEF_FLAT; | |
| 528 | styleValues.fgColor = textPtr->fgColor; | |
| 529 | styleValues.tkfont = textPtr->tkfont; | |
| 530 | styleValues.justify = TK_JUSTIFY_LEFT; | |
| 531 | styleValues.spacing1 = textPtr->spacing1; | |
| 532 | styleValues.spacing2 = textPtr->spacing2; | |
| 533 | styleValues.spacing3 = textPtr->spacing3; | |
| 534 | styleValues.tabArrayPtr = textPtr->tabArrayPtr; | |
| 535 | styleValues.wrapMode = textPtr->wrapMode; | |
| 536 | styleValues.elide = 0; | |
| 537 | for (i = 0 ; i < numTags; i++) { | |
| 538 | tagPtr = tagPtrs[i]; | |
| 539 | ||
| 540 | /* | |
| 541 | * On Windows and Mac, we need to skip the selection tag if | |
| 542 | * we don't have focus. | |
| 543 | */ | |
| 544 | ||
| 545 | #ifndef ALWAYS_SHOW_SELECTION | |
| 546 | if ((tagPtr == textPtr->selTagPtr) && !(textPtr->flags & GOT_FOCUS)) { | |
| 547 | continue; | |
| 548 | &nb |