/* $Header$ */ /* * 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; } /* End of tktextdisp.c */