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/* $Header$ */
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|
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/*
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* tkTextDisp.c --
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*
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* This module provides facilities to display text widgets. It is
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* the only place where information is kept about the screen layout
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* of text widgets.
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*
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* Copyright (c) 1992-1994 The Regents of the University of California.
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* Copyright (c) 1994-1997 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* RCS: @(#) $Id: tktextdisp.c,v 1.1.1.1 2001/06/13 05:10:16 dtashley Exp $
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*/
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#include "tkPort.h"
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#include "tkInt.h"
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#include "tkText.h"
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#ifdef __WIN32__
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#include "tkWinInt.h"
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#endif
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/*
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* The following structure describes how to display a range of characters.
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* The information is generated by scanning all of the tags associated
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* with the characters and combining that with default information for
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* the overall widget. These structures form the hash keys for
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* dInfoPtr->styleTable.
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*/
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typedef struct StyleValues {
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Tk_3DBorder border; /* Used for drawing background under text.
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* NULL means use widget background. */
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int borderWidth; /* Width of 3-D border for background. */
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int relief; /* 3-D relief for background. */
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Pixmap bgStipple; /* Stipple bitmap for background. None
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* means draw solid. */
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XColor *fgColor; /* Foreground color for text. */
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Tk_Font tkfont; /* Font for displaying text. */
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Pixmap fgStipple; /* Stipple bitmap for text and other
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* foreground stuff. None means draw
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* solid.*/
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int justify; /* Justification style for text. */
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int lMargin1; /* Left margin, in pixels, for first display
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* line of each text line. */
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int lMargin2; /* Left margin, in pixels, for second and
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* later display lines of each text line. */
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int offset; /* Offset in pixels of baseline, relative to
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* baseline of line. */
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int overstrike; /* Non-zero means draw overstrike through
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* text. */
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int rMargin; /* Right margin, in pixels. */
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int spacing1; /* Spacing above first dline in text line. */
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int spacing2; /* Spacing between lines of dline. */
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int spacing3; /* Spacing below last dline in text line. */
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TkTextTabArray *tabArrayPtr;/* Locations and types of tab stops (may
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* be NULL). */
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int underline; /* Non-zero means draw underline underneath
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* text. */
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int elide; /* Non-zero means draw text */
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TkWrapMode wrapMode; /* How to handle wrap-around for this tag.
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* One of TEXT_WRAPMODE_CHAR,
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* TEXT_WRAPMODE_NONE or TEXT_WRAPMODE_WORD.*/
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} StyleValues;
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/*
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* The following structure extends the StyleValues structure above with
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* graphics contexts used to actually draw the characters. The entries
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* in dInfoPtr->styleTable point to structures of this type.
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*/
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typedef struct TextStyle {
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int refCount; /* Number of times this structure is
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* referenced in Chunks. */
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GC bgGC; /* Graphics context for background. None
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* means use widget background. */
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GC fgGC; /* Graphics context for foreground. */
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StyleValues *sValuePtr; /* Raw information from which GCs were
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* derived. */
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Tcl_HashEntry *hPtr; /* Pointer to entry in styleTable. Used
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* to delete entry. */
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} TextStyle;
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/*
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* The following macro determines whether two styles have the same
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* background so that, for example, no beveled border should be drawn
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* between them.
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*/
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#define SAME_BACKGROUND(s1, s2) \
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(((s1)->sValuePtr->border == (s2)->sValuePtr->border) \
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&& ((s1)->sValuePtr->borderWidth == (s2)->sValuePtr->borderWidth) \
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&& ((s1)->sValuePtr->relief == (s2)->sValuePtr->relief) \
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&& ((s1)->sValuePtr->bgStipple == (s2)->sValuePtr->bgStipple))
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/*
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* The following structure describes one line of the display, which may
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* be either part or all of one line of the text.
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*/
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typedef struct DLine {
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TkTextIndex index; /* Identifies first character in text
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* that is displayed on this line. */
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int byteCount; /* Number of bytes accounted for by this
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* display line, including a trailing space
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* or newline that isn't actually displayed. */
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int y; /* Y-position at which line is supposed to
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* be drawn (topmost pixel of rectangular
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* area occupied by line). */
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int oldY; /* Y-position at which line currently
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* appears on display. -1 means line isn't
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* currently visible on display and must be
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* redrawn. This is used to move lines by
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* scrolling rather than re-drawing. */
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int height; /* Height of line, in pixels. */
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int baseline; /* Offset of text baseline from y, in
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* pixels. */
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int spaceAbove; /* How much extra space was added to the
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* top of the line because of spacing
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* options. This is included in height
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* and baseline. */
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int spaceBelow; /* How much extra space was added to the
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* bottom of the line because of spacing
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* options. This is included in height. */
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int length; /* Total length of line, in pixels. */
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TkTextDispChunk *chunkPtr; /* Pointer to first chunk in list of all
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* of those that are displayed on this
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* line of the screen. */
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struct DLine *nextPtr; /* Next in list of all display lines for
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* this window. The list is sorted in
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* order from top to bottom. Note: the
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* next DLine doesn't always correspond
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* to the next line of text: (a) can have
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* multiple DLines for one text line, and
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* (b) can have gaps where DLine's have been
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* deleted because they're out of date. */
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int flags; /* Various flag bits: see below for values. */
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} DLine;
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/*
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* Flag bits for DLine structures:
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*
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* HAS_3D_BORDER - Non-zero means that at least one of the
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* chunks in this line has a 3D border, so
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* it potentially interacts with 3D borders
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* in neighboring lines (see
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* DisplayLineBackground).
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* NEW_LAYOUT - Non-zero means that the line has been
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* re-layed out since the last time the
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* display was updated.
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* TOP_LINE - Non-zero means that this was the top line
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* in the window the last time that the window
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* was laid out. This is important because
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* a line may be displayed differently if its
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* at the top or bottom than if it's in the
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* middle (e.g. beveled edges aren't displayed
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* for middle lines if the adjacent line has
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* a similar background).
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* BOTTOM_LINE - Non-zero means that this was the bottom line
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* in the window the last time that the window
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* was laid out.
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* IS_DISABLED - This Dline cannot be edited.
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*/
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#define HAS_3D_BORDER 1
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#define NEW_LAYOUT 2
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#define TOP_LINE 4
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#define BOTTOM_LINE 8
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#define IS_DISABLED 16
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/*
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* Overall display information for a text widget:
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*/
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typedef struct TextDInfo {
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Tcl_HashTable styleTable; /* Hash table that maps from StyleValues
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* to TextStyles for this widget. */
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DLine *dLinePtr; /* First in list of all display lines for
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* this widget, in order from top to bottom. */
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GC copyGC; /* Graphics context for copying from off-
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* screen pixmaps onto screen. */
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GC scrollGC; /* Graphics context for copying from one place
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* in the window to another (scrolling):
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* differs from copyGC in that we need to get
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* GraphicsExpose events. */
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int x; /* First x-coordinate that may be used for
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* actually displaying line information.
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* Leaves space for border, etc. */
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int y; /* First y-coordinate that may be used for
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* actually displaying line information.
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* Leaves space for border, etc. */
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int maxX; /* First x-coordinate to right of available
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* space for displaying lines. */
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int maxY; /* First y-coordinate below available
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* space for displaying lines. */
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int topOfEof; /* Top-most pixel (lowest y-value) that has
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* been drawn in the appropriate fashion for
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* the portion of the window after the last
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* line of the text. This field is used to
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* figure out when to redraw part or all of
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* the eof field. */
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/*
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* Information used for scrolling:
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*/
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int newByteOffset; /* Desired x scroll position, measured as the
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* number of average-size characters off-screen
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* to the left for a line with no left
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* margin. */
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int curPixelOffset; /* Actual x scroll position, measured as the
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* number of pixels off-screen to the left. */
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int maxLength; /* Length in pixels of longest line that's
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* visible in window (length may exceed window
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* size). If there's no wrapping, this will
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* be zero. */
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double xScrollFirst, xScrollLast;
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/* Most recent values reported to horizontal
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* scrollbar; used to eliminate unnecessary
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* reports. */
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double yScrollFirst, yScrollLast;
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/* Most recent values reported to vertical
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* scrollbar; used to eliminate unnecessary
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* reports. */
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/*
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* The following information is used to implement scanning:
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*/
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int scanMarkIndex; /* Byte index of character that was at the
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* left edge of the window when the scan
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* started. */
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int scanMarkX; /* X-position of mouse at time scan started. */
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int scanTotalScroll; /* Total scrolling (in screen lines) that has
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* occurred since scanMarkY was set. */
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int scanMarkY; /* Y-position of mouse at time scan started. */
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/*
|
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* Miscellaneous information:
|
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*/
|
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int dLinesInvalidated; /* This value is set to 1 whenever something
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* happens that invalidates information in
|
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* DLine structures; if a redisplay
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* is in progress, it will see this and
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* abort the redisplay. This is needed
|
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* because, for example, an embedded window
|
252 |
* could change its size when it is first
|
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* displayed, invalidating the DLine that
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* is currently being displayed. If redisplay
|
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* continues, it will use freed memory and
|
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* could dump core. */
|
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int flags; /* Various flag values: see below for
|
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* definitions. */
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} TextDInfo;
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260 |
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/*
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262 |
* In TkTextDispChunk structures for character segments, the clientData
|
263 |
* field points to one of the following structures:
|
264 |
*/
|
265 |
|
266 |
typedef struct CharInfo {
|
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int numBytes; /* Number of bytes to display. */
|
268 |
char chars[4]; /* UTF characters to display. Actual size
|
269 |
* will be numBytes, not 4. THIS MUST BE
|
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* THE LAST FIELD IN THE STRUCTURE. */
|
271 |
} CharInfo;
|
272 |
|
273 |
/*
|
274 |
* Flag values for TextDInfo structures:
|
275 |
*
|
276 |
* DINFO_OUT_OF_DATE: Non-zero means that the DLine structures
|
277 |
* for this window are partially or completely
|
278 |
* out of date and need to be recomputed.
|
279 |
* REDRAW_PENDING: Means that a when-idle handler has been
|
280 |
* scheduled to update the display.
|
281 |
* REDRAW_BORDERS: Means window border or pad area has
|
282 |
* potentially been damaged and must be redrawn.
|
283 |
* REPICK_NEEDED: 1 means that the widget has been modified
|
284 |
* in a way that could change the current
|
285 |
* character (a different character might be
|
286 |
* under the mouse cursor now). Need to
|
287 |
* recompute the current character before
|
288 |
* the next redisplay.
|
289 |
*/
|
290 |
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291 |
#define DINFO_OUT_OF_DATE 1
|
292 |
#define REDRAW_PENDING 2
|
293 |
#define REDRAW_BORDERS 4
|
294 |
#define REPICK_NEEDED 8
|
295 |
|
296 |
/*
|
297 |
* The following counters keep statistics about redisplay that can be
|
298 |
* checked to see how clever this code is at reducing redisplays.
|
299 |
*/
|
300 |
|
301 |
static int numRedisplays; /* Number of calls to DisplayText. */
|
302 |
static int linesRedrawn; /* Number of calls to DisplayDLine. */
|
303 |
static int numCopies; /* Number of calls to XCopyArea to copy part
|
304 |
* of the screen. */
|
305 |
|
306 |
/*
|
307 |
* Forward declarations for procedures defined later in this file:
|
308 |
*/
|
309 |
|
310 |
static void AdjustForTab _ANSI_ARGS_((TkText *textPtr,
|
311 |
TkTextTabArray *tabArrayPtr, int index,
|
312 |
TkTextDispChunk *chunkPtr));
|
313 |
static void CharBboxProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr,
|
314 |
int index, int y, int lineHeight, int baseline,
|
315 |
int *xPtr, int *yPtr, int *widthPtr,
|
316 |
int *heightPtr));
|
317 |
static void CharDisplayProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr,
|
318 |
int x, int y, int height, int baseline,
|
319 |
Display *display, Drawable dst, int screenY));
|
320 |
static int CharMeasureProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr,
|
321 |
int x));
|
322 |
static void CharUndisplayProc _ANSI_ARGS_((TkText *textPtr,
|
323 |
TkTextDispChunk *chunkPtr));
|
324 |
|
325 |
/*
|
326 |
Definitions of elided procs.
|
327 |
Compiler can't inline these since we use pointers to these functions.
|
328 |
ElideDisplayProc, ElideUndisplayProc special-cased for speed,
|
329 |
as potentially many elided DLine chunks if large, tag toggle-filled
|
330 |
elided region.
|
331 |
*/
|
332 |
static void ElideBboxProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr,
|
333 |
int index, int y, int lineHeight, int baseline,
|
334 |
int *xPtr, int *yPtr, int *widthPtr,
|
335 |
int *heightPtr));
|
336 |
static int ElideMeasureProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr,
|
337 |
int x));
|
338 |
|
339 |
static void DisplayDLine _ANSI_ARGS_((TkText *textPtr,
|
340 |
DLine *dlPtr, DLine *prevPtr, Pixmap pixmap));
|
341 |
static void DisplayLineBackground _ANSI_ARGS_((TkText *textPtr,
|
342 |
DLine *dlPtr, DLine *prevPtr, Pixmap pixmap));
|
343 |
static void DisplayText _ANSI_ARGS_((ClientData clientData));
|
344 |
static DLine * FindDLine _ANSI_ARGS_((DLine *dlPtr,
|
345 |
TkTextIndex *indexPtr));
|
346 |
static void FreeDLines _ANSI_ARGS_((TkText *textPtr,
|
347 |
DLine *firstPtr, DLine *lastPtr, int unlink));
|
348 |
static void FreeStyle _ANSI_ARGS_((TkText *textPtr,
|
349 |
TextStyle *stylePtr));
|
350 |
static TextStyle * GetStyle _ANSI_ARGS_((TkText *textPtr,
|
351 |
TkTextIndex *indexPtr));
|
352 |
static void GetXView _ANSI_ARGS_((Tcl_Interp *interp,
|
353 |
TkText *textPtr, int report));
|
354 |
static void GetYView _ANSI_ARGS_((Tcl_Interp *interp,
|
355 |
TkText *textPtr, int report));
|
356 |
static DLine * LayoutDLine _ANSI_ARGS_((TkText *textPtr,
|
357 |
TkTextIndex *indexPtr));
|
358 |
static int MeasureChars _ANSI_ARGS_((Tk_Font tkfont,
|
359 |
CONST char *source, int maxBytes, int startX,
|
360 |
int maxX, int tabOrigin, int *nextXPtr));
|
361 |
static void MeasureUp _ANSI_ARGS_((TkText *textPtr,
|
362 |
TkTextIndex *srcPtr, int distance,
|
363 |
TkTextIndex *dstPtr));
|
364 |
static int NextTabStop _ANSI_ARGS_((Tk_Font tkfont, int x,
|
365 |
int tabOrigin));
|
366 |
static void UpdateDisplayInfo _ANSI_ARGS_((TkText *textPtr));
|
367 |
static void ScrollByLines _ANSI_ARGS_((TkText *textPtr,
|
368 |
int offset));
|
369 |
static int SizeOfTab _ANSI_ARGS_((TkText *textPtr,
|
370 |
TkTextTabArray *tabArrayPtr, int index, int x,
|
371 |
int maxX));
|
372 |
static void TextInvalidateRegion _ANSI_ARGS_((TkText *textPtr,
|
373 |
TkRegion region));
|
374 |
|
375 |
|
376 |
/*
|
377 |
*----------------------------------------------------------------------
|
378 |
*
|
379 |
* TkTextCreateDInfo --
|
380 |
*
|
381 |
* This procedure is called when a new text widget is created.
|
382 |
* Its job is to set up display-related information for the widget.
|
383 |
*
|
384 |
* Results:
|
385 |
* None.
|
386 |
*
|
387 |
* Side effects:
|
388 |
* A TextDInfo data structure is allocated and initialized and attached
|
389 |
* to textPtr.
|
390 |
*
|
391 |
*----------------------------------------------------------------------
|
392 |
*/
|
393 |
|
394 |
void
|
395 |
TkTextCreateDInfo(textPtr)
|
396 |
TkText *textPtr; /* Overall information for text widget. */
|
397 |
{
|
398 |
register TextDInfo *dInfoPtr;
|
399 |
XGCValues gcValues;
|
400 |
|
401 |
dInfoPtr = (TextDInfo *) ckalloc(sizeof(TextDInfo));
|
402 |
Tcl_InitHashTable(&dInfoPtr->styleTable, sizeof(StyleValues)/sizeof(int));
|
403 |
dInfoPtr->dLinePtr = NULL;
|
404 |
dInfoPtr->copyGC = None;
|
405 |
gcValues.graphics_exposures = True;
|
406 |
dInfoPtr->scrollGC = Tk_GetGC(textPtr->tkwin, GCGraphicsExposures,
|
407 |
&gcValues);
|
408 |
dInfoPtr->topOfEof = 0;
|
409 |
dInfoPtr->newByteOffset = 0;
|
410 |
dInfoPtr->curPixelOffset = 0;
|
411 |
dInfoPtr->maxLength = 0;
|
412 |
dInfoPtr->xScrollFirst = -1;
|
413 |
dInfoPtr->xScrollLast = -1;
|
414 |
dInfoPtr->yScrollFirst = -1;
|
415 |
dInfoPtr->yScrollLast = -1;
|
416 |
dInfoPtr->scanMarkIndex = 0;
|
417 |
dInfoPtr->scanMarkX = 0;
|
418 |
dInfoPtr->scanTotalScroll = 0;
|
419 |
dInfoPtr->scanMarkY = 0;
|
420 |
dInfoPtr->dLinesInvalidated = 0;
|
421 |
dInfoPtr->flags = DINFO_OUT_OF_DATE;
|
422 |
textPtr->dInfoPtr = dInfoPtr;
|
423 |
}
|
424 |
|
425 |
/*
|
426 |
*----------------------------------------------------------------------
|
427 |
*
|
428 |
* TkTextFreeDInfo --
|
429 |
*
|
430 |
* This procedure is called to free up all of the private display
|
431 |
* information kept by this file for a text widget.
|
432 |
*
|
433 |
* Results:
|
434 |
* None.
|
435 |
*
|
436 |
* Side effects:
|
437 |
* Lots of resources get freed.
|
438 |
*
|
439 |
*----------------------------------------------------------------------
|
440 |
*/
|
441 |
|
442 |
void
|
443 |
TkTextFreeDInfo(textPtr)
|
444 |
TkText *textPtr; /* Overall information for text widget. */
|
445 |
{
|
446 |
register TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
447 |
|
448 |
/*
|
449 |
* Be careful to free up styleTable *after* freeing up all the
|
450 |
* DLines, so that the hash table is still intact to free up the
|
451 |
* style-related information from the lines. Once the lines are
|
452 |
* all free then styleTable will be empty.
|
453 |
*/
|
454 |
|
455 |
FreeDLines(textPtr, dInfoPtr->dLinePtr, (DLine *) NULL, 1);
|
456 |
Tcl_DeleteHashTable(&dInfoPtr->styleTable);
|
457 |
if (dInfoPtr->copyGC != None) {
|
458 |
Tk_FreeGC(textPtr->display, dInfoPtr->copyGC);
|
459 |
}
|
460 |
Tk_FreeGC(textPtr->display, dInfoPtr->scrollGC);
|
461 |
if (dInfoPtr->flags & REDRAW_PENDING) {
|
462 |
Tcl_CancelIdleCall(DisplayText, (ClientData) textPtr);
|
463 |
}
|
464 |
ckfree((char *) dInfoPtr);
|
465 |
}
|
466 |
|
467 |
/*
|
468 |
*----------------------------------------------------------------------
|
469 |
*
|
470 |
* GetStyle --
|
471 |
*
|
472 |
* This procedure creates all the information needed to display
|
473 |
* text at a particular location.
|
474 |
*
|
475 |
* Results:
|
476 |
* The return value is a pointer to a TextStyle structure that
|
477 |
* corresponds to *sValuePtr.
|
478 |
*
|
479 |
* Side effects:
|
480 |
* A new entry may be created in the style table for the widget.
|
481 |
*
|
482 |
*----------------------------------------------------------------------
|
483 |
*/
|
484 |
|
485 |
static TextStyle *
|
486 |
GetStyle(textPtr, indexPtr)
|
487 |
TkText *textPtr; /* Overall information about text widget. */
|
488 |
TkTextIndex *indexPtr; /* The character in the text for which
|
489 |
* display information is wanted. */
|
490 |
{
|
491 |
TkTextTag **tagPtrs;
|
492 |
register TkTextTag *tagPtr;
|
493 |
StyleValues styleValues;
|
494 |
TextStyle *stylePtr;
|
495 |
Tcl_HashEntry *hPtr;
|
496 |
int numTags, new, i;
|
497 |
XGCValues gcValues;
|
498 |
unsigned long mask;
|
499 |
|
500 |
/*
|
501 |
* The variables below keep track of the highest-priority specification
|
502 |
* that has occurred for each of the various fields of the StyleValues.
|
503 |
*/
|
504 |
|
505 |
int borderPrio, borderWidthPrio, reliefPrio, bgStipplePrio;
|
506 |
int fgPrio, fontPrio, fgStipplePrio;
|
507 |
int underlinePrio, elidePrio, justifyPrio, offsetPrio;
|
508 |
int lMargin1Prio, lMargin2Prio, rMarginPrio;
|
509 |
int spacing1Prio, spacing2Prio, spacing3Prio;
|
510 |
int overstrikePrio, tabPrio, wrapPrio;
|
511 |
|
512 |
/*
|
513 |
* Find out what tags are present for the character, then compute
|
514 |
* a StyleValues structure corresponding to those tags (scan
|
515 |
* through all of the tags, saving information for the highest-
|
516 |
* priority tag).
|
517 |
*/
|
518 |
|
519 |
tagPtrs = TkBTreeGetTags(indexPtr, &numTags);
|
520 |
borderPrio = borderWidthPrio = reliefPrio = bgStipplePrio = -1;
|
521 |
fgPrio = fontPrio = fgStipplePrio = -1;
|
522 |
underlinePrio = elidePrio = justifyPrio = offsetPrio = -1;
|
523 |
lMargin1Prio = lMargin2Prio = rMarginPrio = -1;
|
524 |
spacing1Prio = spacing2Prio = spacing3Prio = -1;
|
525 |
overstrikePrio = tabPrio = wrapPrio = -1;
|
526 |
memset((VOID *) &styleValues, 0, sizeof(StyleValues));
|
527 |
styleValues.relief = TK_RELIEF_FLAT;
|
528 |
styleValues.fgColor = textPtr->fgColor;
|
529 |
styleValues.tkfont = textPtr->tkfont;
|
530 |
styleValues.justify = TK_JUSTIFY_LEFT;
|
531 |
styleValues.spacing1 = textPtr->spacing1;
|
532 |
styleValues.spacing2 = textPtr->spacing2;
|
533 |
styleValues.spacing3 = textPtr->spacing3;
|
534 |
styleValues.tabArrayPtr = textPtr->tabArrayPtr;
|
535 |
styleValues.wrapMode = textPtr->wrapMode;
|
536 |
styleValues.elide = 0;
|
537 |
for (i = 0 ; i < numTags; i++) {
|
538 |
tagPtr = tagPtrs[i];
|
539 |
|
540 |
/*
|
541 |
* On Windows and Mac, we need to skip the selection tag if
|
542 |
* we don't have focus.
|
543 |
*/
|
544 |
|
545 |
#ifndef ALWAYS_SHOW_SELECTION
|
546 |
if ((tagPtr == textPtr->selTagPtr) && !(textPtr->flags & GOT_FOCUS)) {
|
547 |
continue;
|
548 |
}
|
549 |
#endif
|
550 |
|
551 |
if ((tagPtr->border != NULL) && (tagPtr->priority > borderPrio)) {
|
552 |
styleValues.border = tagPtr->border;
|
553 |
borderPrio = tagPtr->priority;
|
554 |
}
|
555 |
if ((tagPtr->bdString != NULL)
|
556 |
&& (tagPtr->priority > borderWidthPrio)) {
|
557 |
styleValues.borderWidth = tagPtr->borderWidth;
|
558 |
borderWidthPrio = tagPtr->priority;
|
559 |
}
|
560 |
if ((tagPtr->reliefString != NULL)
|
561 |
&& (tagPtr->priority > reliefPrio)) {
|
562 |
if (styleValues.border == NULL) {
|
563 |
styleValues.border = textPtr->border;
|
564 |
}
|
565 |
styleValues.relief = tagPtr->relief;
|
566 |
reliefPrio = tagPtr->priority;
|
567 |
}
|
568 |
if ((tagPtr->bgStipple != None)
|
569 |
&& (tagPtr->priority > bgStipplePrio)) {
|
570 |
styleValues.bgStipple = tagPtr->bgStipple;
|
571 |
bgStipplePrio = tagPtr->priority;
|
572 |
}
|
573 |
if ((tagPtr->fgColor != None) && (tagPtr->priority > fgPrio)) {
|
574 |
styleValues.fgColor = tagPtr->fgColor;
|
575 |
fgPrio = tagPtr->priority;
|
576 |
}
|
577 |
if ((tagPtr->tkfont != None) && (tagPtr->priority > fontPrio)) {
|
578 |
styleValues.tkfont = tagPtr->tkfont;
|
579 |
fontPrio = tagPtr->priority;
|
580 |
}
|
581 |
if ((tagPtr->fgStipple != None)
|
582 |
&& (tagPtr->priority > fgStipplePrio)) {
|
583 |
styleValues.fgStipple = tagPtr->fgStipple;
|
584 |
fgStipplePrio = tagPtr->priority;
|
585 |
}
|
586 |
if ((tagPtr->justifyString != NULL)
|
587 |
&& (tagPtr->priority > justifyPrio)) {
|
588 |
styleValues.justify = tagPtr->justify;
|
589 |
justifyPrio = tagPtr->priority;
|
590 |
}
|
591 |
if ((tagPtr->lMargin1String != NULL)
|
592 |
&& (tagPtr->priority > lMargin1Prio)) {
|
593 |
styleValues.lMargin1 = tagPtr->lMargin1;
|
594 |
lMargin1Prio = tagPtr->priority;
|
595 |
}
|
596 |
if ((tagPtr->lMargin2String != NULL)
|
597 |
&& (tagPtr->priority > lMargin2Prio)) {
|
598 |
styleValues.lMargin2 = tagPtr->lMargin2;
|
599 |
lMargin2Prio = tagPtr->priority;
|
600 |
}
|
601 |
if ((tagPtr->offsetString != NULL)
|
602 |
&& (tagPtr->priority > offsetPrio)) {
|
603 |
styleValues.offset = tagPtr->offset;
|
604 |
offsetPrio = tagPtr->priority;
|
605 |
}
|
606 |
if ((tagPtr->overstrikeString != NULL)
|
607 |
&& (tagPtr->priority > overstrikePrio)) {
|
608 |
styleValues.overstrike = tagPtr->overstrike;
|
609 |
overstrikePrio = tagPtr->priority;
|
610 |
}
|
611 |
if ((tagPtr->rMarginString != NULL)
|
612 |
&& (tagPtr->priority > rMarginPrio)) {
|
613 |
styleValues.rMargin = tagPtr->rMargin;
|
614 |
rMarginPrio = tagPtr->priority;
|
615 |
}
|
616 |
if ((tagPtr->spacing1String != NULL)
|
617 |
&& (tagPtr->priority > spacing1Prio)) {
|
618 |
styleValues.spacing1 = tagPtr->spacing1;
|
619 |
spacing1Prio = tagPtr->priority;
|
620 |
}
|
621 |
if ((tagPtr->spacing2String != NULL)
|
622 |
&& (tagPtr->priority > spacing2Prio)) {
|
623 |
styleValues.spacing2 = tagPtr->spacing2;
|
624 |
spacing2Prio = tagPtr->priority;
|
625 |
}
|
626 |
if ((tagPtr->spacing3String != NULL)
|
627 |
&& (tagPtr->priority > spacing3Prio)) {
|
628 |
styleValues.spacing3 = tagPtr->spacing3;
|
629 |
spacing3Prio = tagPtr->priority;
|
630 |
}
|
631 |
if ((tagPtr->tabString != NULL)
|
632 |
&& (tagPtr->priority > tabPrio)) {
|
633 |
styleValues.tabArrayPtr = tagPtr->tabArrayPtr;
|
634 |
tabPrio = tagPtr->priority;
|
635 |
}
|
636 |
if ((tagPtr->underlineString != NULL)
|
637 |
&& (tagPtr->priority > underlinePrio)) {
|
638 |
styleValues.underline = tagPtr->underline;
|
639 |
underlinePrio = tagPtr->priority;
|
640 |
}
|
641 |
if ((tagPtr->elideString != NULL)
|
642 |
&& (tagPtr->priority > elidePrio)) {
|
643 |
styleValues.elide = tagPtr->elide;
|
644 |
elidePrio = tagPtr->priority;
|
645 |
}
|
646 |
if ((tagPtr->wrapMode != TEXT_WRAPMODE_NULL)
|
647 |
&& (tagPtr->priority > wrapPrio)) {
|
648 |
styleValues.wrapMode = tagPtr->wrapMode;
|
649 |
wrapPrio = tagPtr->priority;
|
650 |
}
|
651 |
}
|
652 |
if (tagPtrs != NULL) {
|
653 |
ckfree((char *) tagPtrs);
|
654 |
}
|
655 |
|
656 |
/*
|
657 |
* Use an existing style if there's one around that matches.
|
658 |
*/
|
659 |
|
660 |
hPtr = Tcl_CreateHashEntry(&textPtr->dInfoPtr->styleTable,
|
661 |
(char *) &styleValues, &new);
|
662 |
if (!new) {
|
663 |
stylePtr = (TextStyle *) Tcl_GetHashValue(hPtr);
|
664 |
stylePtr->refCount++;
|
665 |
return stylePtr;
|
666 |
}
|
667 |
|
668 |
/*
|
669 |
* No existing style matched. Make a new one.
|
670 |
*/
|
671 |
|
672 |
stylePtr = (TextStyle *) ckalloc(sizeof(TextStyle));
|
673 |
stylePtr->refCount = 1;
|
674 |
if (styleValues.border != NULL) {
|
675 |
gcValues.foreground = Tk_3DBorderColor(styleValues.border)->pixel;
|
676 |
mask = GCForeground;
|
677 |
if (styleValues.bgStipple != None) {
|
678 |
gcValues.stipple = styleValues.bgStipple;
|
679 |
gcValues.fill_style = FillStippled;
|
680 |
mask |= GCStipple|GCFillStyle;
|
681 |
}
|
682 |
stylePtr->bgGC = Tk_GetGC(textPtr->tkwin, mask, &gcValues);
|
683 |
} else {
|
684 |
stylePtr->bgGC = None;
|
685 |
}
|
686 |
mask = GCFont;
|
687 |
gcValues.font = Tk_FontId(styleValues.tkfont);
|
688 |
mask |= GCForeground;
|
689 |
gcValues.foreground = styleValues.fgColor->pixel;
|
690 |
if (styleValues.fgStipple != None) {
|
691 |
gcValues.stipple = styleValues.fgStipple;
|
692 |
gcValues.fill_style = FillStippled;
|
693 |
mask |= GCStipple|GCFillStyle;
|
694 |
}
|
695 |
stylePtr->fgGC = Tk_GetGC(textPtr->tkwin, mask, &gcValues);
|
696 |
stylePtr->sValuePtr = (StyleValues *)
|
697 |
Tcl_GetHashKey(&textPtr->dInfoPtr->styleTable, hPtr);
|
698 |
stylePtr->hPtr = hPtr;
|
699 |
Tcl_SetHashValue(hPtr, stylePtr);
|
700 |
return stylePtr;
|
701 |
}
|
702 |
|
703 |
/*
|
704 |
*----------------------------------------------------------------------
|
705 |
*
|
706 |
* FreeStyle --
|
707 |
*
|
708 |
* This procedure is called when a TextStyle structure is no longer
|
709 |
* needed. It decrements the reference count and frees up the
|
710 |
* space for the style structure if the reference count is 0.
|
711 |
*
|
712 |
* Results:
|
713 |
* None.
|
714 |
*
|
715 |
* Side effects:
|
716 |
* The storage and other resources associated with the style
|
717 |
* are freed up if no-one's still using it.
|
718 |
*
|
719 |
*----------------------------------------------------------------------
|
720 |
*/
|
721 |
|
722 |
static void
|
723 |
FreeStyle(textPtr, stylePtr)
|
724 |
TkText *textPtr; /* Information about overall widget. */
|
725 |
register TextStyle *stylePtr; /* Information about style to free. */
|
726 |
|
727 |
{
|
728 |
stylePtr->refCount--;
|
729 |
if (stylePtr->refCount == 0) {
|
730 |
if (stylePtr->bgGC != None) {
|
731 |
Tk_FreeGC(textPtr->display, stylePtr->bgGC);
|
732 |
}
|
733 |
if (stylePtr->fgGC != None) {
|
734 |
Tk_FreeGC(textPtr->display, stylePtr->fgGC);
|
735 |
}
|
736 |
Tcl_DeleteHashEntry(stylePtr->hPtr);
|
737 |
ckfree((char *) stylePtr);
|
738 |
}
|
739 |
}
|
740 |
|
741 |
/*
|
742 |
*----------------------------------------------------------------------
|
743 |
*
|
744 |
* LayoutDLine --
|
745 |
*
|
746 |
* This procedure generates a single DLine structure for a display
|
747 |
* line whose leftmost character is given by indexPtr.
|
748 |
*
|
749 |
* Results:
|
750 |
* The return value is a pointer to a DLine structure desribing the
|
751 |
* display line. All fields are filled in and correct except for
|
752 |
* y and nextPtr.
|
753 |
*
|
754 |
* Side effects:
|
755 |
* Storage is allocated for the new DLine.
|
756 |
*
|
757 |
*----------------------------------------------------------------------
|
758 |
*/
|
759 |
|
760 |
static DLine *
|
761 |
LayoutDLine(textPtr, indexPtr)
|
762 |
TkText *textPtr; /* Overall information about text widget. */
|
763 |
TkTextIndex *indexPtr; /* Beginning of display line. May not
|
764 |
* necessarily point to a character segment. */
|
765 |
{
|
766 |
register DLine *dlPtr; /* New display line. */
|
767 |
TkTextSegment *segPtr; /* Current segment in text. */
|
768 |
TkTextDispChunk *lastChunkPtr; /* Last chunk allocated so far
|
769 |
* for line. */
|
770 |
TkTextDispChunk *chunkPtr; /* Current chunk. */
|
771 |
TkTextIndex curIndex;
|
772 |
TkTextDispChunk *breakChunkPtr; /* Chunk containing best word break
|
773 |
* point, if any. */
|
774 |
TkTextIndex breakIndex; /* Index of first character in
|
775 |
* breakChunkPtr. */
|
776 |
int breakByteOffset; /* Byte offset of character within
|
777 |
* breakChunkPtr just to right of best
|
778 |
* break point. */
|
779 |
int noCharsYet; /* Non-zero means that no characters
|
780 |
* have been placed on the line yet. */
|
781 |
int justify; /* How to justify line: taken from
|
782 |
* style for the first character in
|
783 |
* line. */
|
784 |
int jIndent; /* Additional indentation (beyond
|
785 |
* margins) due to justification. */
|
786 |
int rMargin; /* Right margin width for line. */
|
787 |
TkWrapMode wrapMode; /* Wrap mode to use for this line. */
|
788 |
int x = 0, maxX = 0; /* Initializations needed only to
|
789 |
* stop compiler warnings. */
|
790 |
int wholeLine; /* Non-zero means this display line
|
791 |
* runs to the end of the text line. */
|
792 |
int tabIndex; /* Index of the current tab stop. */
|
793 |
int gotTab; /* Non-zero means the current chunk
|
794 |
* contains a tab. */
|
795 |
TkTextDispChunk *tabChunkPtr; /* Pointer to the chunk containing
|
796 |
* the previous tab stop. */
|
797 |
int maxBytes; /* Maximum number of bytes to
|
798 |
* include in this chunk. */
|
799 |
TkTextTabArray *tabArrayPtr; /* Tab stops for line; taken from
|
800 |
* style for the first character on
|
801 |
* line. */
|
802 |
int tabSize; /* Number of pixels consumed by current
|
803 |
* tab stop. */
|
804 |
TkTextDispChunk *lastCharChunkPtr; /* Pointer to last chunk in display
|
805 |
* lines with numBytes > 0. Used to
|
806 |
* drop 0-sized chunks from the end
|
807 |
* of the line. */
|
808 |
int byteOffset, ascent, descent, code, elide, elidesize;
|
809 |
StyleValues *sValuePtr;
|
810 |
|
811 |
/*
|
812 |
* Create and initialize a new DLine structure.
|
813 |
*/
|
814 |
|
815 |
dlPtr = (DLine *) ckalloc(sizeof(DLine));
|
816 |
dlPtr->index = *indexPtr;
|
817 |
dlPtr->byteCount = 0;
|
818 |
dlPtr->y = 0;
|
819 |
dlPtr->oldY = -1;
|
820 |
dlPtr->height = 0;
|
821 |
dlPtr->baseline = 0;
|
822 |
dlPtr->chunkPtr = NULL;
|
823 |
dlPtr->nextPtr = NULL;
|
824 |
dlPtr->flags = NEW_LAYOUT;
|
825 |
|
826 |
/*
|
827 |
* Special case entirely elide line as there may be 1000s or more
|
828 |
*/
|
829 |
elide = TkTextIsElided(textPtr, indexPtr); /* save a malloc */
|
830 |
if (elide && indexPtr->byteIndex==0) {
|
831 |
maxBytes = 0;
|
832 |
for (segPtr = indexPtr->linePtr->segPtr;
|
833 |
elide && (segPtr != NULL);
|
834 |
segPtr = segPtr->nextPtr) {
|
835 |
if ((elidesize = segPtr->size) > 0) {
|
836 |
maxBytes += elidesize;
|
837 |
/*
|
838 |
* If have we have a tag toggle, there is a chance
|
839 |
* that invisibility state changed, so bail out
|
840 |
*/
|
841 |
} else if ((segPtr->typePtr == &tkTextToggleOffType)
|
842 |
|| (segPtr->typePtr == &tkTextToggleOnType)) {
|
843 |
if (segPtr->body.toggle.tagPtr->elideString != NULL) {
|
844 |
elide = (segPtr->typePtr == &tkTextToggleOffType)
|
845 |
^ segPtr->body.toggle.tagPtr->elide;
|
846 |
}
|
847 |
}
|
848 |
}
|
849 |
|
850 |
if (elide) {
|
851 |
dlPtr->byteCount = maxBytes;
|
852 |
dlPtr->spaceAbove = dlPtr->spaceBelow = dlPtr->length = 0;
|
853 |
return dlPtr;
|
854 |
}
|
855 |
}
|
856 |
|
857 |
/*
|
858 |
* Each iteration of the loop below creates one TkTextDispChunk for
|
859 |
* the new display line. The line will always have at least one
|
860 |
* chunk (for the newline character at the end, if there's nothing
|
861 |
* else available).
|
862 |
*/
|
863 |
|
864 |
curIndex = *indexPtr;
|
865 |
lastChunkPtr = NULL;
|
866 |
chunkPtr = NULL;
|
867 |
noCharsYet = 1;
|
868 |
elide = 0;
|
869 |
breakChunkPtr = NULL;
|
870 |
breakByteOffset = 0;
|
871 |
justify = TK_JUSTIFY_LEFT;
|
872 |
tabIndex = -1;
|
873 |
tabChunkPtr = NULL;
|
874 |
tabArrayPtr = NULL;
|
875 |
rMargin = 0;
|
876 |
wrapMode = TEXT_WRAPMODE_CHAR;
|
877 |
tabSize = 0;
|
878 |
lastCharChunkPtr = NULL;
|
879 |
|
880 |
/*
|
881 |
* Find the first segment to consider for the line. Can't call
|
882 |
* TkTextIndexToSeg for this because it won't return a segment
|
883 |
* with zero size (such as the insertion cursor's mark).
|
884 |
*/
|
885 |
|
886 |
for (byteOffset = curIndex.byteIndex, segPtr = curIndex.linePtr->segPtr;
|
887 |
(byteOffset > 0) && (byteOffset >= segPtr->size);
|
888 |
byteOffset -= segPtr->size, segPtr = segPtr->nextPtr) {
|
889 |
/* Empty loop body. */
|
890 |
}
|
891 |
|
892 |
while (segPtr != NULL) {
|
893 |
/*
|
894 |
* Every line still gets at least one chunk due to expectations
|
895 |
* in the rest of the code, but we are able to skip elided portions
|
896 |
* of the line quickly.
|
897 |
* If current chunk is elided and last chunk was too, coalese
|
898 |
*/
|
899 |
if (elide && (lastChunkPtr != NULL)
|
900 |
&& (lastChunkPtr->displayProc == NULL /*ElideDisplayProc*/)) {
|
901 |
if ((elidesize = segPtr->size - byteOffset) > 0) {
|
902 |
curIndex.byteIndex += elidesize;
|
903 |
lastChunkPtr->numBytes += elidesize;
|
904 |
breakByteOffset = lastChunkPtr->breakIndex = lastChunkPtr->numBytes;
|
905 |
/*
|
906 |
* If have we have a tag toggle, there is a chance
|
907 |
* that invisibility state changed, so bail out
|
908 |
*/
|
909 |
} else if ((segPtr->typePtr == &tkTextToggleOffType)
|
910 |
|| (segPtr->typePtr == &tkTextToggleOnType)) {
|
911 |
if (segPtr->body.toggle.tagPtr->elideString != NULL) {
|
912 |
elide = (segPtr->typePtr == &tkTextToggleOffType)
|
913 |
^ segPtr->body.toggle.tagPtr->elide;
|
914 |
}
|
915 |
}
|
916 |
|
917 |
byteOffset = 0;
|
918 |
segPtr = segPtr->nextPtr;
|
919 |
if (segPtr == NULL && chunkPtr != NULL) {
|
920 |
ckfree((char *) chunkPtr);
|
921 |
}
|
922 |
continue;
|
923 |
}
|
924 |
|
925 |
if (segPtr->typePtr->layoutProc == NULL) {
|
926 |
segPtr = segPtr->nextPtr;
|
927 |
byteOffset = 0;
|
928 |
continue;
|
929 |
}
|
930 |
if (chunkPtr == NULL) {
|
931 |
chunkPtr = (TkTextDispChunk *) ckalloc(sizeof(TkTextDispChunk));
|
932 |
chunkPtr->nextPtr = NULL;
|
933 |
}
|
934 |
chunkPtr->stylePtr = GetStyle(textPtr, &curIndex);
|
935 |
elide = chunkPtr->stylePtr->sValuePtr->elide;
|
936 |
|
937 |
/*
|
938 |
* Save style information such as justification and indentation,
|
939 |
* up until the first character is encountered, then retain that
|
940 |
* information for the rest of the line.
|
941 |
*/
|
942 |
|
943 |
if (noCharsYet) {
|
944 |
tabArrayPtr = chunkPtr->stylePtr->sValuePtr->tabArrayPtr;
|
945 |
justify = chunkPtr->stylePtr->sValuePtr->justify;
|
946 |
rMargin = chunkPtr->stylePtr->sValuePtr->rMargin;
|
947 |
wrapMode = chunkPtr->stylePtr->sValuePtr->wrapMode;
|
948 |
x = ((curIndex.byteIndex == 0)
|
949 |
? chunkPtr->stylePtr->sValuePtr->lMargin1
|
950 |
: chunkPtr->stylePtr->sValuePtr->lMargin2);
|
951 |
if (wrapMode == TEXT_WRAPMODE_NONE) {
|
952 |
maxX = -1;
|
953 |
} else {
|
954 |
maxX = textPtr->dInfoPtr->maxX - textPtr->dInfoPtr->x
|
955 |
- rMargin;
|
956 |
if (maxX < x) {
|
957 |
maxX = x;
|
958 |
}
|
959 |
}
|
960 |
}
|
961 |
|
962 |
/*
|
963 |
* See if there is a tab in the current chunk; if so, only
|
964 |
* layout characters up to (and including) the tab.
|
965 |
*/
|
966 |
|
967 |
gotTab = 0;
|
968 |
maxBytes = segPtr->size - byteOffset;
|
969 |
if (!elide && justify == TK_JUSTIFY_LEFT) {
|
970 |
if (segPtr->typePtr == &tkTextCharType) {
|
971 |
char *p;
|
972 |
|
973 |
for (p = segPtr->body.chars + byteOffset; *p != 0; p++) {
|
974 |
if (*p == '\t') {
|
975 |
maxBytes = (p + 1 - segPtr->body.chars) - byteOffset;
|
976 |
gotTab = 1;
|
977 |
break;
|
978 |
}
|
979 |
}
|
980 |
}
|
981 |
}
|
982 |
chunkPtr->x = x;
|
983 |
if (elide && maxBytes) {
|
984 |
/* don't free style here, as other code expects to be able to do that */
|
985 |
/*breakByteOffset =*/ chunkPtr->breakIndex = chunkPtr->numBytes = maxBytes;
|
986 |
chunkPtr->width = 0;
|
987 |
chunkPtr->minAscent = chunkPtr->minDescent = chunkPtr->minHeight = 0;
|
988 |
|
989 |
/* would just like to point to canonical empty chunk */
|
990 |
chunkPtr->displayProc = (Tk_ChunkDisplayProc *) NULL;
|
991 |
chunkPtr->undisplayProc = (Tk_ChunkUndisplayProc *) NULL;
|
992 |
chunkPtr->measureProc = ElideMeasureProc;
|
993 |
chunkPtr->bboxProc = ElideBboxProc;
|
994 |
|
995 |
code = 1;
|
996 |
} else
|
997 |
code = (*segPtr->typePtr->layoutProc)(textPtr, &curIndex, segPtr,
|
998 |
byteOffset, maxX-tabSize, maxBytes, noCharsYet, wrapMode,
|
999 |
chunkPtr);
|
1000 |
if (code <= 0) {
|
1001 |
FreeStyle(textPtr, chunkPtr->stylePtr);
|
1002 |
if (code < 0) {
|
1003 |
/*
|
1004 |
* This segment doesn't wish to display itself (e.g. most
|
1005 |
* marks).
|
1006 |
*/
|
1007 |
|
1008 |
segPtr = segPtr->nextPtr;
|
1009 |
byteOffset = 0;
|
1010 |
continue;
|
1011 |
}
|
1012 |
|
1013 |
/*
|
1014 |
* No characters from this segment fit in the window: this
|
1015 |
* means we're at the end of the display line.
|
1016 |
*/
|
1017 |
|
1018 |
if (chunkPtr != NULL) {
|
1019 |
ckfree((char *) chunkPtr);
|
1020 |
}
|
1021 |
break;
|
1022 |
}
|
1023 |
if (chunkPtr->numBytes > 0) {
|
1024 |
noCharsYet = 0;
|
1025 |
lastCharChunkPtr = chunkPtr;
|
1026 |
}
|
1027 |
if (lastChunkPtr == NULL) {
|
1028 |
dlPtr->chunkPtr = chunkPtr;
|
1029 |
} else {
|
1030 |
lastChunkPtr->nextPtr = chunkPtr;
|
1031 |
}
|
1032 |
lastChunkPtr = chunkPtr;
|
1033 |
x += chunkPtr->width;
|
1034 |
if (chunkPtr->breakIndex > 0) {
|
1035 |
breakByteOffset = chunkPtr->breakIndex;
|
1036 |
breakIndex = curIndex;
|
1037 |
breakChunkPtr = chunkPtr;
|
1038 |
}
|
1039 |
if (chunkPtr->numBytes != maxBytes) {
|
1040 |
break;
|
1041 |
}
|
1042 |
|
1043 |
/*
|
1044 |
* If we're at a new tab, adjust the layout for all the chunks
|
1045 |
* pertaining to the previous tab. Also adjust the amount of
|
1046 |
* space left in the line to account for space that will be eaten
|
1047 |
* up by the tab.
|
1048 |
*/
|
1049 |
|
1050 |
if (gotTab) {
|
1051 |
if (tabIndex >= 0) {
|
1052 |
AdjustForTab(textPtr, tabArrayPtr, tabIndex, tabChunkPtr);
|
1053 |
x = chunkPtr->x + chunkPtr->width;
|
1054 |
}
|
1055 |
tabIndex++;
|
1056 |
tabChunkPtr = chunkPtr;
|
1057 |
tabSize = SizeOfTab(textPtr, tabArrayPtr, tabIndex, x, maxX);
|
1058 |
if ((maxX >= 0) && (tabSize >= maxX - x)) {
|
1059 |
break;
|
1060 |
}
|
1061 |
}
|
1062 |
curIndex.byteIndex += chunkPtr->numBytes;
|
1063 |
byteOffset += chunkPtr->numBytes;
|
1064 |
if (byteOffset >= segPtr->size) {
|
1065 |
byteOffset = 0;
|
1066 |
segPtr = segPtr->nextPtr;
|
1067 |
}
|
1068 |
|
1069 |
chunkPtr = NULL;
|
1070 |
}
|
1071 |
if (noCharsYet) {
|
1072 |
panic("LayoutDLine couldn't place any characters on a line");
|
1073 |
}
|
1074 |
wholeLine = (segPtr == NULL);
|
1075 |
|
1076 |
/*
|
1077 |
* We're at the end of the display line. Throw away everything
|
1078 |
* after the most recent word break, if there is one; this may
|
1079 |
* potentially require the last chunk to be layed out again.
|
1080 |
*/
|
1081 |
|
1082 |
if (breakChunkPtr == NULL) {
|
1083 |
/*
|
1084 |
* This code makes sure that we don't accidentally display
|
1085 |
* chunks with no characters at the end of the line (such as
|
1086 |
* the insertion cursor). These chunks belong on the next
|
1087 |
* line. So, throw away everything after the last chunk that
|
1088 |
* has characters in it.
|
1089 |
*/
|
1090 |
|
1091 |
breakChunkPtr = lastCharChunkPtr;
|
1092 |
breakByteOffset = breakChunkPtr->numBytes;
|
1093 |
}
|
1094 |
if ((breakChunkPtr != NULL) && ((lastChunkPtr != breakChunkPtr)
|
1095 |
|| (breakByteOffset != lastChunkPtr->numBytes))) {
|
1096 |
while (1) {
|
1097 |
chunkPtr = breakChunkPtr->nextPtr;
|
1098 |
if (chunkPtr == NULL) {
|
1099 |
break;
|
1100 |
}
|
1101 |
FreeStyle(textPtr, chunkPtr->stylePtr);
|
1102 |
breakChunkPtr->nextPtr = chunkPtr->nextPtr;
|
1103 |
(*chunkPtr->undisplayProc)(textPtr, chunkPtr);
|
1104 |
ckfree((char *) chunkPtr);
|
1105 |
}
|
1106 |
if (breakByteOffset != breakChunkPtr->numBytes) {
|
1107 |
(*breakChunkPtr->undisplayProc)(textPtr, breakChunkPtr);
|
1108 |
segPtr = TkTextIndexToSeg(&breakIndex, &byteOffset);
|
1109 |
(*segPtr->typePtr->layoutProc)(textPtr, &breakIndex,
|
1110 |
segPtr, byteOffset, maxX, breakByteOffset, 0,
|
1111 |
wrapMode, breakChunkPtr);
|
1112 |
}
|
1113 |
lastChunkPtr = breakChunkPtr;
|
1114 |
wholeLine = 0;
|
1115 |
}
|
1116 |
|
1117 |
|
1118 |
/*
|
1119 |
* Make tab adjustments for the last tab stop, if there is one.
|
1120 |
*/
|
1121 |
|
1122 |
if ((tabIndex >= 0) && (tabChunkPtr != NULL)) {
|
1123 |
AdjustForTab(textPtr, tabArrayPtr, tabIndex, tabChunkPtr);
|
1124 |
}
|
1125 |
|
1126 |
/*
|
1127 |
* Make one more pass over the line to recompute various things
|
1128 |
* like its height, length, and total number of bytes. Also
|
1129 |
* modify the x-locations of chunks to reflect justification.
|
1130 |
* If we're not wrapping, I'm not sure what is the best way to
|
1131 |
* handle left and center justification: should the total length,
|
1132 |
* for purposes of justification, be (a) the window width, (b)
|
1133 |
* the length of the longest line in the window, or (c) the length
|
1134 |
* of the longest line in the text? (c) isn't available, (b) seems
|
1135 |
* weird, since it can change with vertical scrolling, so (a) is
|
1136 |
* what is implemented below.
|
1137 |
*/
|
1138 |
|
1139 |
if (wrapMode == TEXT_WRAPMODE_NONE) {
|
1140 |
maxX = textPtr->dInfoPtr->maxX - textPtr->dInfoPtr->x - rMargin;
|
1141 |
}
|
1142 |
dlPtr->length = lastChunkPtr->x + lastChunkPtr->width;
|
1143 |
if (justify == TK_JUSTIFY_LEFT) {
|
1144 |
jIndent = 0;
|
1145 |
} else if (justify == TK_JUSTIFY_RIGHT) {
|
1146 |
jIndent = maxX - dlPtr->length;
|
1147 |
} else {
|
1148 |
jIndent = (maxX - dlPtr->length)/2;
|
1149 |
}
|
1150 |
ascent = descent = 0;
|
1151 |
for (chunkPtr = dlPtr->chunkPtr; chunkPtr != NULL;
|
1152 |
chunkPtr = chunkPtr->nextPtr) {
|
1153 |
chunkPtr->x += jIndent;
|
1154 |
dlPtr->byteCount += chunkPtr->numBytes;
|
1155 |
if (chunkPtr->minAscent > ascent) {
|
1156 |
ascent = chunkPtr->minAscent;
|
1157 |
}
|
1158 |
if (chunkPtr->minDescent > descent) {
|
1159 |
descent = chunkPtr->minDescent;
|
1160 |
}
|
1161 |
if (chunkPtr->minHeight > dlPtr->height) {
|
1162 |
dlPtr->height = chunkPtr->minHeight;
|
1163 |
}
|
1164 |
sValuePtr = chunkPtr->stylePtr->sValuePtr;
|
1165 |
if ((sValuePtr->borderWidth > 0)
|
1166 |
&& (sValuePtr->relief != TK_RELIEF_FLAT)) {
|
1167 |
dlPtr->flags |= HAS_3D_BORDER;
|
1168 |
}
|
1169 |
}
|
1170 |
if (dlPtr->height < (ascent + descent)) {
|
1171 |
dlPtr->height = ascent + descent;
|
1172 |
dlPtr->baseline = ascent;
|
1173 |
} else {
|
1174 |
dlPtr->baseline = ascent + (dlPtr->height - ascent - descent)/2;
|
1175 |
}
|
1176 |
sValuePtr = dlPtr->chunkPtr->stylePtr->sValuePtr;
|
1177 |
if (dlPtr->index.byteIndex == 0) {
|
1178 |
dlPtr->spaceAbove = sValuePtr->spacing1;
|
1179 |
} else {
|
1180 |
dlPtr->spaceAbove = sValuePtr->spacing2 - sValuePtr->spacing2/2;
|
1181 |
}
|
1182 |
if (wholeLine) {
|
1183 |
dlPtr->spaceBelow = sValuePtr->spacing3;
|
1184 |
} else {
|
1185 |
dlPtr->spaceBelow = sValuePtr->spacing2/2;
|
1186 |
}
|
1187 |
dlPtr->height += dlPtr->spaceAbove + dlPtr->spaceBelow;
|
1188 |
dlPtr->baseline += dlPtr->spaceAbove;
|
1189 |
|
1190 |
/*
|
1191 |
* Recompute line length: may have changed because of justification.
|
1192 |
*/
|
1193 |
|
1194 |
dlPtr->length = lastChunkPtr->x + lastChunkPtr->width;
|
1195 |
return dlPtr;
|
1196 |
}
|
1197 |
|
1198 |
/*
|
1199 |
*----------------------------------------------------------------------
|
1200 |
*
|
1201 |
* UpdateDisplayInfo --
|
1202 |
*
|
1203 |
* This procedure is invoked to recompute some or all of the
|
1204 |
* DLine structures for a text widget. At the time it is called
|
1205 |
* the DLine structures still left in the widget are guaranteed
|
1206 |
* to be correct except that (a) the y-coordinates aren't
|
1207 |
* necessarily correct, (b) there may be missing structures
|
1208 |
* (the DLine structures get removed as soon as they are potentially
|
1209 |
* out-of-date), and (c) DLine structures that don't start at the
|
1210 |
* beginning of a line may be incorrect if previous information in
|
1211 |
* the same line changed size in a way that moved a line boundary
|
1212 |
* (DLines for any info that changed will have been deleted, but
|
1213 |
* not DLines for unchanged info in the same text line).
|
1214 |
*
|
1215 |
* Results:
|
1216 |
* None.
|
1217 |
*
|
1218 |
* Side effects:
|
1219 |
* Upon return, the DLine information for textPtr correctly reflects
|
1220 |
* the positions where characters will be displayed. However, this
|
1221 |
* procedure doesn't actually bring the display up-to-date.
|
1222 |
*
|
1223 |
*----------------------------------------------------------------------
|
1224 |
*/
|
1225 |
|
1226 |
static void
|
1227 |
UpdateDisplayInfo(textPtr)
|
1228 |
TkText *textPtr; /* Text widget to update. */
|
1229 |
{
|
1230 |
register TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
1231 |
register DLine *dlPtr, *prevPtr;
|
1232 |
TkTextIndex index;
|
1233 |
TkTextLine *lastLinePtr;
|
1234 |
int y, maxY, pixelOffset, maxOffset;
|
1235 |
|
1236 |
if (!(dInfoPtr->flags & DINFO_OUT_OF_DATE)) {
|
1237 |
return;
|
1238 |
}
|
1239 |
dInfoPtr->flags &= ~DINFO_OUT_OF_DATE;
|
1240 |
|
1241 |
/*
|
1242 |
* Delete any DLines that are now above the top of the window.
|
1243 |
*/
|
1244 |
|
1245 |
index = textPtr->topIndex;
|
1246 |
dlPtr = FindDLine(dInfoPtr->dLinePtr, &index);
|
1247 |
if ((dlPtr != NULL) && (dlPtr != dInfoPtr->dLinePtr)) {
|
1248 |
FreeDLines(textPtr, dInfoPtr->dLinePtr, dlPtr, 1);
|
1249 |
}
|
1250 |
|
1251 |
/*
|
1252 |
*--------------------------------------------------------------
|
1253 |
* Scan through the contents of the window from top to bottom,
|
1254 |
* recomputing information for lines that are missing.
|
1255 |
*--------------------------------------------------------------
|
1256 |
*/
|
1257 |
|
1258 |
lastLinePtr = TkBTreeFindLine(textPtr->tree,
|
1259 |
TkBTreeNumLines(textPtr->tree));
|
1260 |
dlPtr = dInfoPtr->dLinePtr;
|
1261 |
prevPtr = NULL;
|
1262 |
y = dInfoPtr->y;
|
1263 |
maxY = dInfoPtr->maxY;
|
1264 |
while (1) {
|
1265 |
register DLine *newPtr;
|
1266 |
|
1267 |
if (index.linePtr == lastLinePtr) {
|
1268 |
break;
|
1269 |
}
|
1270 |
|
1271 |
/*
|
1272 |
* There are three possibilities right now:
|
1273 |
* (a) the next DLine (dlPtr) corresponds exactly to the next
|
1274 |
* information we want to display: just use it as-is.
|
1275 |
* (b) the next DLine corresponds to a different line, or to
|
1276 |
* a segment that will be coming later in the same line:
|
1277 |
* leave this DLine alone in the hopes that we'll be able
|
1278 |
* to use it later, then create a new DLine in front of
|
1279 |
* it.
|
1280 |
* (c) the next DLine corresponds to a segment in the line we
|
1281 |
* want, but it's a segment that has already been processed
|
1282 |
* or will never be processed. Delete the DLine and try
|
1283 |
* again.
|
1284 |
*
|
1285 |
* One other twist on all this. It's possible for 3D borders
|
1286 |
* to interact between lines (see DisplayLineBackground) so if
|
1287 |
* a line is relayed out and has styles with 3D borders, its
|
1288 |
* neighbors have to be redrawn if they have 3D borders too,
|
1289 |
* since the interactions could have changed (the neighbors
|
1290 |
* don't have to be relayed out, just redrawn).
|
1291 |
*/
|
1292 |
|
1293 |
if ((dlPtr == NULL) || (dlPtr->index.linePtr != index.linePtr)) {
|
1294 |
/*
|
1295 |
* Case (b) -- must make new DLine.
|
1296 |
*/
|
1297 |
|
1298 |
makeNewDLine:
|
1299 |
if (tkTextDebug) {
|
1300 |
char string[TK_POS_CHARS];
|
1301 |
|
1302 |
/*
|
1303 |
* Debugging is enabled, so keep a log of all the lines
|
1304 |
* that were re-layed out. The test suite uses this
|
1305 |
* information.
|
1306 |
*/
|
1307 |
|
1308 |
TkTextPrintIndex(&index, string);
|
1309 |
Tcl_SetVar2(textPtr->interp, "tk_textRelayout", (char *) NULL,
|
1310 |
string,
|
1311 |
TCL_GLOBAL_ONLY|TCL_APPEND_VALUE|TCL_LIST_ELEMENT);
|
1312 |
}
|
1313 |
newPtr = LayoutDLine(textPtr, &index);
|
1314 |
if (prevPtr == NULL) {
|
1315 |
dInfoPtr->dLinePtr = newPtr;
|
1316 |
} else {
|
1317 |
prevPtr->nextPtr = newPtr;
|
1318 |
if (prevPtr->flags & HAS_3D_BORDER) {
|
1319 |
prevPtr->oldY = -1;
|
1320 |
}
|
1321 |
}
|
1322 |
newPtr->nextPtr = dlPtr;
|
1323 |
dlPtr = newPtr;
|
1324 |
} else {
|
1325 |
/*
|
1326 |
* DlPtr refers to the line we want. Next check the
|
1327 |
* index within the line.
|
1328 |
*/
|
1329 |
|
1330 |
if (index.byteIndex == dlPtr->index.byteIndex) {
|
1331 |
/*
|
1332 |
* Case (a) -- can use existing display line as-is.
|
1333 |
*/
|
1334 |
|
1335 |
if ((dlPtr->flags & HAS_3D_BORDER) && (prevPtr != NULL)
|
1336 |
&& (prevPtr->flags & (NEW_LAYOUT))) {
|
1337 |
dlPtr->oldY = -1;
|
1338 |
}
|
1339 |
goto lineOK;
|
1340 |
}
|
1341 |
if (index.byteIndex < dlPtr->index.byteIndex) {
|
1342 |
goto makeNewDLine;
|
1343 |
}
|
1344 |
|
1345 |
/*
|
1346 |
* Case (c) -- dlPtr is useless. Discard it and start
|
1347 |
* again with the next display line.
|
1348 |
*/
|
1349 |
|
1350 |
newPtr = dlPtr->nextPtr;
|
1351 |
FreeDLines(textPtr, dlPtr, newPtr, 0);
|
1352 |
dlPtr = newPtr;
|
1353 |
if (prevPtr != NULL) {
|
1354 |
prevPtr->nextPtr = newPtr;
|
1355 |
} else {
|
1356 |
dInfoPtr->dLinePtr = newPtr;
|
1357 |
}
|
1358 |
continue;
|
1359 |
}
|
1360 |
|
1361 |
/*
|
1362 |
* Advance to the start of the next line.
|
1363 |
*/
|
1364 |
|
1365 |
lineOK:
|
1366 |
dlPtr->y = y;
|
1367 |
y += dlPtr->height;
|
1368 |
TkTextIndexForwBytes(&index, dlPtr->byteCount, &index);
|
1369 |
prevPtr = dlPtr;
|
1370 |
dlPtr = dlPtr->nextPtr;
|
1371 |
|
1372 |
/*
|
1373 |
* If we switched text lines, delete any DLines left for the
|
1374 |
* old text line.
|
1375 |
*/
|
1376 |
|
1377 |
if (index.linePtr != prevPtr->index.linePtr) {
|
1378 |
register DLine *nextPtr;
|
1379 |
|
1380 |
nextPtr = dlPtr;
|
1381 |
while ((nextPtr != NULL)
|
1382 |
&& (nextPtr->index.linePtr == prevPtr->index.linePtr)) {
|
1383 |
nextPtr = nextPtr->nextPtr;
|
1384 |
}
|
1385 |
if (nextPtr != dlPtr) {
|
1386 |
FreeDLines(textPtr, dlPtr, nextPtr, 0);
|
1387 |
prevPtr->nextPtr = nextPtr;
|
1388 |
dlPtr = nextPtr;
|
1389 |
}
|
1390 |
}
|
1391 |
|
1392 |
/*
|
1393 |
* It's important to have the following check here rather than in
|
1394 |
* the while statement for the loop, so that there's always at least
|
1395 |
* one DLine generated, regardless of how small the window is. This
|
1396 |
* keeps a lot of other code from breaking.
|
1397 |
*/
|
1398 |
|
1399 |
if (y >= maxY) {
|
1400 |
break;
|
1401 |
}
|
1402 |
}
|
1403 |
|
1404 |
/*
|
1405 |
* Delete any DLine structures that don't fit on the screen.
|
1406 |
*/
|
1407 |
|
1408 |
FreeDLines(textPtr, dlPtr, (DLine *) NULL, 1);
|
1409 |
|
1410 |
/*
|
1411 |
*--------------------------------------------------------------
|
1412 |
* If there is extra space at the bottom of the window (because
|
1413 |
* we've hit the end of the text), then bring in more lines at
|
1414 |
* the top of the window, if there are any, to fill in the view.
|
1415 |
*--------------------------------------------------------------
|
1416 |
*/
|
1417 |
|
1418 |
if (y < maxY) {
|
1419 |
int lineNum, spaceLeft, bytesToCount;
|
1420 |
DLine *lowestPtr;
|
1421 |
|
1422 |
/*
|
1423 |
* Layout an entire text line (potentially > 1 display line),
|
1424 |
* then link in as many display lines as fit without moving
|
1425 |
* the bottom line out of the window. Repeat this until
|
1426 |
* all the extra space has been used up or we've reached the
|
1427 |
* beginning of the text.
|
1428 |
*/
|
1429 |
|
1430 |
spaceLeft = maxY - y;
|
1431 |
lineNum = TkBTreeLineIndex(dInfoPtr->dLinePtr->index.linePtr);
|
1432 |
bytesToCount = dInfoPtr->dLinePtr->index.byteIndex;
|
1433 |
if (bytesToCount == 0) {
|
1434 |
bytesToCount = INT_MAX;
|
1435 |
lineNum--;
|
1436 |
}
|
1437 |
for ( ; (lineNum >= 0) && (spaceLeft > 0); lineNum--) {
|
1438 |
index.linePtr = TkBTreeFindLine(textPtr->tree, lineNum);
|
1439 |
index.byteIndex = 0;
|
1440 |
lowestPtr = NULL;
|
1441 |
|
1442 |
do {
|
1443 |
dlPtr = LayoutDLine(textPtr, &index);
|
1444 |
dlPtr->nextPtr = lowestPtr;
|
1445 |
lowestPtr = dlPtr;
|
1446 |
if (dlPtr->length == 0 && dlPtr->height == 0) { bytesToCount--; break; } /* elide */
|
1447 |
TkTextIndexForwBytes(&index, dlPtr->byteCount, &index);
|
1448 |
bytesToCount -= dlPtr->byteCount;
|
1449 |
} while ((bytesToCount > 0)
|
1450 |
&& (index.linePtr == lowestPtr->index.linePtr));
|
1451 |
|
1452 |
/*
|
1453 |
* Scan through the display lines from the bottom one up to
|
1454 |
* the top one.
|
1455 |
*/
|
1456 |
|
1457 |
while (lowestPtr != NULL) {
|
1458 |
dlPtr = lowestPtr;
|
1459 |
spaceLeft -= dlPtr->height;
|
1460 |
if (spaceLeft < 0) {
|
1461 |
break;
|
1462 |
}
|
1463 |
lowestPtr = dlPtr->nextPtr;
|
1464 |
dlPtr->nextPtr = dInfoPtr->dLinePtr;
|
1465 |
dInfoPtr->dLinePtr = dlPtr;
|
1466 |
if (tkTextDebug) {
|
1467 |
char string[TK_POS_CHARS];
|
1468 |
|
1469 |
TkTextPrintIndex(&dlPtr->index, string);
|
1470 |
Tcl_SetVar2(textPtr->interp, "tk_textRelayout",
|
1471 |
(char *) NULL, string,
|
1472 |
TCL_GLOBAL_ONLY|TCL_APPEND_VALUE|TCL_LIST_ELEMENT);
|
1473 |
}
|
1474 |
}
|
1475 |
FreeDLines(textPtr, lowestPtr, (DLine *) NULL, 0);
|
1476 |
bytesToCount = INT_MAX;
|
1477 |
}
|
1478 |
|
1479 |
/*
|
1480 |
* Now we're all done except that the y-coordinates in all the
|
1481 |
* DLines are wrong and the top index for the text is wrong.
|
1482 |
* Update them.
|
1483 |
*/
|
1484 |
|
1485 |
textPtr->topIndex = dInfoPtr->dLinePtr->index;
|
1486 |
y = dInfoPtr->y;
|
1487 |
for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL;
|
1488 |
dlPtr = dlPtr->nextPtr) {
|
1489 |
if (y > dInfoPtr->maxY) {
|
1490 |
panic("Added too many new lines in UpdateDisplayInfo");
|
1491 |
}
|
1492 |
dlPtr->y = y;
|
1493 |
y += dlPtr->height;
|
1494 |
}
|
1495 |
}
|
1496 |
|
1497 |
/*
|
1498 |
*--------------------------------------------------------------
|
1499 |
* If the old top or bottom line has scrolled elsewhere on the
|
1500 |
* screen, we may not be able to re-use its old contents by
|
1501 |
* copying bits (e.g., a beveled edge that was drawn when it was
|
1502 |
* at the top or bottom won't be drawn when the line is in the
|
1503 |
* middle and its neighbor has a matching background). Similarly,
|
1504 |
* if the new top or bottom line came from somewhere else on the
|
1505 |
* screen, we may not be able to copy the old bits.
|
1506 |
*--------------------------------------------------------------
|
1507 |
*/
|
1508 |
|
1509 |
dlPtr = dInfoPtr->dLinePtr;
|
1510 |
if ((dlPtr->flags & HAS_3D_BORDER) && !(dlPtr->flags & TOP_LINE)) {
|
1511 |
dlPtr->oldY = -1;
|
1512 |
}
|
1513 |
while (1) {
|
1514 |
if ((dlPtr->flags & TOP_LINE) && (dlPtr != dInfoPtr->dLinePtr)
|
1515 |
&& (dlPtr->flags & HAS_3D_BORDER)) {
|
1516 |
dlPtr->oldY = -1;
|
1517 |
}
|
1518 |
if ((dlPtr->flags & BOTTOM_LINE) && (dlPtr->nextPtr != NULL)
|
1519 |
&& (dlPtr->flags & HAS_3D_BORDER)) {
|
1520 |
dlPtr->oldY = -1;
|
1521 |
}
|
1522 |
if (dlPtr->nextPtr == NULL) {
|
1523 |
if ((dlPtr->flags & HAS_3D_BORDER)
|
1524 |
&& !(dlPtr->flags & BOTTOM_LINE)) {
|
1525 |
dlPtr->oldY = -1;
|
1526 |
}
|
1527 |
dlPtr->flags &= ~TOP_LINE;
|
1528 |
dlPtr->flags |= BOTTOM_LINE;
|
1529 |
break;
|
1530 |
}
|
1531 |
dlPtr->flags &= ~(TOP_LINE|BOTTOM_LINE);
|
1532 |
dlPtr = dlPtr->nextPtr;
|
1533 |
}
|
1534 |
dInfoPtr->dLinePtr->flags |= TOP_LINE;
|
1535 |
|
1536 |
/*
|
1537 |
* Arrange for scrollbars to be updated.
|
1538 |
*/
|
1539 |
|
1540 |
textPtr->flags |= UPDATE_SCROLLBARS;
|
1541 |
|
1542 |
/*
|
1543 |
*--------------------------------------------------------------
|
1544 |
* Deal with horizontal scrolling:
|
1545 |
* 1. If there's empty space to the right of the longest line,
|
1546 |
* shift the screen to the right to fill in the empty space.
|
1547 |
* 2. If the desired horizontal scroll position has changed,
|
1548 |
* force a full redisplay of all the lines in the widget.
|
1549 |
* 3. If the wrap mode isn't "none" then re-scroll to the base
|
1550 |
* position.
|
1551 |
*--------------------------------------------------------------
|
1552 |
*/
|
1553 |
|
1554 |
dInfoPtr->maxLength = 0;
|
1555 |
for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL;
|
1556 |
dlPtr = dlPtr->nextPtr) {
|
1557 |
if (dlPtr->length > dInfoPtr->maxLength) {
|
1558 |
dInfoPtr->maxLength = dlPtr->length;
|
1559 |
}
|
1560 |
}
|
1561 |
maxOffset = (dInfoPtr->maxLength - (dInfoPtr->maxX - dInfoPtr->x)
|
1562 |
+ textPtr->charWidth - 1)/textPtr->charWidth;
|
1563 |
if (dInfoPtr->newByteOffset > maxOffset) {
|
1564 |
dInfoPtr->newByteOffset = maxOffset;
|
1565 |
}
|
1566 |
if (dInfoPtr->newByteOffset < 0) {
|
1567 |
dInfoPtr->newByteOffset = 0;
|
1568 |
}
|
1569 |
pixelOffset = dInfoPtr->newByteOffset * textPtr->charWidth;
|
1570 |
if (pixelOffset != dInfoPtr->curPixelOffset) {
|
1571 |
dInfoPtr->curPixelOffset = pixelOffset;
|
1572 |
for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL;
|
1573 |
dlPtr = dlPtr->nextPtr) {
|
1574 |
dlPtr->oldY = -1;
|
1575 |
}
|
1576 |
}
|
1577 |
}
|
1578 |
|
1579 |
/*
|
1580 |
*----------------------------------------------------------------------
|
1581 |
*
|
1582 |
* FreeDLines --
|
1583 |
*
|
1584 |
* This procedure is called to free up all of the resources
|
1585 |
* associated with one or more DLine structures.
|
1586 |
*
|
1587 |
* Results:
|
1588 |
* None.
|
1589 |
*
|
1590 |
* Side effects:
|
1591 |
* Memory gets freed and various other resources are released.
|
1592 |
*
|
1593 |
*----------------------------------------------------------------------
|
1594 |
*/
|
1595 |
|
1596 |
static void
|
1597 |
FreeDLines(textPtr, firstPtr, lastPtr, unlink)
|
1598 |
TkText *textPtr; /* Information about overall text
|
1599 |
* widget. */
|
1600 |
register DLine *firstPtr; /* Pointer to first DLine to free up. */
|
1601 |
DLine *lastPtr; /* Pointer to DLine just after last
|
1602 |
* one to free (NULL means everything
|
1603 |
* starting with firstPtr). */
|
1604 |
int unlink; /* 1 means DLines are currently linked
|
1605 |
* into the list rooted at
|
1606 |
* textPtr->dInfoPtr->dLinePtr and
|
1607 |
* they have to be unlinked. 0 means
|
1608 |
* just free without unlinking. */
|
1609 |
{
|
1610 |
register TkTextDispChunk *chunkPtr, *nextChunkPtr;
|
1611 |
register DLine *nextDLinePtr;
|
1612 |
|
1613 |
if (unlink) {
|
1614 |
if (textPtr->dInfoPtr->dLinePtr == firstPtr) {
|
1615 |
textPtr->dInfoPtr->dLinePtr = lastPtr;
|
1616 |
} else {
|
1617 |
register DLine *prevPtr;
|
1618 |
for (prevPtr = textPtr->dInfoPtr->dLinePtr;
|
1619 |
prevPtr->nextPtr != firstPtr; prevPtr = prevPtr->nextPtr) {
|
1620 |
/* Empty loop body. */
|
1621 |
}
|
1622 |
prevPtr->nextPtr = lastPtr;
|
1623 |
}
|
1624 |
}
|
1625 |
while (firstPtr != lastPtr) {
|
1626 |
nextDLinePtr = firstPtr->nextPtr;
|
1627 |
for (chunkPtr = firstPtr->chunkPtr; chunkPtr != NULL;
|
1628 |
chunkPtr = nextChunkPtr) {
|
1629 |
if (chunkPtr->undisplayProc != NULL) {
|
1630 |
(*chunkPtr->undisplayProc)(textPtr, chunkPtr);
|
1631 |
}
|
1632 |
FreeStyle(textPtr, chunkPtr->stylePtr);
|
1633 |
nextChunkPtr = chunkPtr->nextPtr;
|
1634 |
ckfree((char *) chunkPtr);
|
1635 |
}
|
1636 |
ckfree((char *) firstPtr);
|
1637 |
firstPtr = nextDLinePtr;
|
1638 |
}
|
1639 |
textPtr->dInfoPtr->dLinesInvalidated = 1;
|
1640 |
}
|
1641 |
|
1642 |
/*
|
1643 |
*----------------------------------------------------------------------
|
1644 |
*
|
1645 |
* DisplayDLine --
|
1646 |
*
|
1647 |
* This procedure is invoked to draw a single line on the
|
1648 |
* screen.
|
1649 |
*
|
1650 |
* Results:
|
1651 |
* None.
|
1652 |
*
|
1653 |
* Side effects:
|
1654 |
* The line given by dlPtr is drawn at its correct position in
|
1655 |
* textPtr's window. Note that this is one *display* line, not
|
1656 |
* one *text* line.
|
1657 |
*
|
1658 |
*----------------------------------------------------------------------
|
1659 |
*/
|
1660 |
|
1661 |
static void
|
1662 |
DisplayDLine(textPtr, dlPtr, prevPtr, pixmap)
|
1663 |
TkText *textPtr; /* Text widget in which to draw line. */
|
1664 |
register DLine *dlPtr; /* Information about line to draw. */
|
1665 |
DLine *prevPtr; /* Line just before one to draw, or NULL
|
1666 |
* if dlPtr is the top line. */
|
1667 |
Pixmap pixmap; /* Pixmap to use for double-buffering.
|
1668 |
* Caller must make sure it's large enough
|
1669 |
* to hold line. */
|
1670 |
{
|
1671 |
register TkTextDispChunk *chunkPtr;
|
1672 |
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
1673 |
Display *display;
|
1674 |
int height, x;
|
1675 |
|
1676 |
if (dlPtr->chunkPtr == NULL) return;
|
1677 |
|
1678 |
/*
|
1679 |
* First, clear the area of the line to the background color for the
|
1680 |
* text widget.
|
1681 |
*/
|
1682 |
|
1683 |
display = Tk_Display(textPtr->tkwin);
|
1684 |
Tk_Fill3DRectangle(textPtr->tkwin, pixmap, textPtr->border, 0, 0,
|
1685 |
Tk_Width(textPtr->tkwin), dlPtr->height, 0, TK_RELIEF_FLAT);
|
1686 |
|
1687 |
/*
|
1688 |
* Next, draw background information for the whole line.
|
1689 |
*/
|
1690 |
|
1691 |
DisplayLineBackground(textPtr, dlPtr, prevPtr, pixmap);
|
1692 |
|
1693 |
/*
|
1694 |
* Make another pass through all of the chunks to redraw the
|
1695 |
* insertion cursor, if it is visible on this line. Must do
|
1696 |
* it here rather than in the foreground pass below because
|
1697 |
* otherwise a wide insertion cursor will obscure the character
|
1698 |
* to its left.
|
1699 |
*/
|
1700 |
|
1701 |
if (textPtr->state == TK_STATE_NORMAL) {
|
1702 |
for (chunkPtr = dlPtr->chunkPtr; (chunkPtr != NULL);
|
1703 |
chunkPtr = chunkPtr->nextPtr) {
|
1704 |
x = chunkPtr->x + dInfoPtr->x - dInfoPtr->curPixelOffset;
|
1705 |
if (chunkPtr->displayProc == TkTextInsertDisplayProc) {
|
1706 |
(*chunkPtr->displayProc)(chunkPtr, x, dlPtr->spaceAbove,
|
1707 |
dlPtr->height - dlPtr->spaceAbove - dlPtr->spaceBelow,
|
1708 |
dlPtr->baseline - dlPtr->spaceAbove, display, pixmap,
|
1709 |
dlPtr->y + dlPtr->spaceAbove);
|
1710 |
}
|
1711 |
}
|
1712 |
}
|
1713 |
|
1714 |
/*
|
1715 |
* Make yet another pass through all of the chunks to redraw all of
|
1716 |
* foreground information. Note: we have to call the displayProc
|
1717 |
* even for chunks that are off-screen. This is needed, for
|
1718 |
* example, so that embedded windows can be unmapped in this case.
|
1719 |
* Conve
|
1720 |
*/
|
1721 |
|
1722 |
for (chunkPtr = dlPtr->chunkPtr; (chunkPtr != NULL);
|
1723 |
chunkPtr = chunkPtr->nextPtr) {
|
1724 |
if (chunkPtr->displayProc == TkTextInsertDisplayProc) {
|
1725 |
/*
|
1726 |
* Already displayed the insertion cursor above. Don't
|
1727 |
* do it again here.
|
1728 |
*/
|
1729 |
|
1730 |
continue;
|
1731 |
}
|
1732 |
x = chunkPtr->x + dInfoPtr->x - dInfoPtr->curPixelOffset;
|
1733 |
if ((x + chunkPtr->width <= 0) || (x >= dInfoPtr->maxX)) {
|
1734 |
/*
|
1735 |
* Note: we have to call the displayProc even for chunks
|
1736 |
* that are off-screen. This is needed, for example, so
|
1737 |
* that embedded windows can be unmapped in this case.
|
1738 |
* Display the chunk at a coordinate that can be clearly
|
1739 |
* identified by the displayProc as being off-screen to
|
1740 |
* the left (the displayProc may not be able to tell if
|
1741 |
* something is off to the right).
|
1742 |
*/
|
1743 |
|
1744 |
if (chunkPtr->displayProc != NULL)
|
1745 |
(*chunkPtr->displayProc)(chunkPtr, -chunkPtr->width,
|
1746 |
dlPtr->spaceAbove,
|
1747 |
dlPtr->height - dlPtr->spaceAbove - dlPtr->spaceBelow,
|
1748 |
dlPtr->baseline - dlPtr->spaceAbove, display, pixmap,
|
1749 |
dlPtr->y + dlPtr->spaceAbove);
|
1750 |
} else {
|
1751 |
/* don't call if elide. This tax ok since not very many visible DLine's in
|
1752 |
an area, but potentially many elide ones */
|
1753 |
if (chunkPtr->displayProc != NULL)
|
1754 |
(*chunkPtr->displayProc)(chunkPtr, x, dlPtr->spaceAbove,
|
1755 |
dlPtr->height - dlPtr->spaceAbove - dlPtr->spaceBelow,
|
1756 |
dlPtr->baseline - dlPtr->spaceAbove, display, pixmap,
|
1757 |
dlPtr->y + dlPtr->spaceAbove);
|
1758 |
}
|
1759 |
if (dInfoPtr->dLinesInvalidated) {
|
1760 |
return;
|
1761 |
}
|
1762 |
}
|
1763 |
|
1764 |
/*
|
1765 |
* Copy the pixmap onto the screen. If this is the last line on
|
1766 |
* the screen then copy a piece of the line, so that it doesn't
|
1767 |
* overflow into the border area. Another special trick: copy the
|
1768 |
* padding area to the left of the line; this is because the
|
1769 |
* insertion cursor sometimes overflows onto that area and we want
|
1770 |
* to get as much of the cursor as possible.
|
1771 |
*/
|
1772 |
|
1773 |
height = dlPtr->height;
|
1774 |
if ((height + dlPtr->y) > dInfoPtr->maxY) {
|
1775 |
height = dInfoPtr->maxY - dlPtr->y;
|
1776 |
}
|
1777 |
XCopyArea(display, pixmap, Tk_WindowId(textPtr->tkwin), dInfoPtr->copyGC,
|
1778 |
dInfoPtr->x, 0, (unsigned) (dInfoPtr->maxX - dInfoPtr->x),
|
1779 |
(unsigned) height, dInfoPtr->x, dlPtr->y);
|
1780 |
linesRedrawn++;
|
1781 |
}
|
1782 |
|
1783 |
/*
|
1784 |
*--------------------------------------------------------------
|
1785 |
*
|
1786 |
* DisplayLineBackground --
|
1787 |
*
|
1788 |
* This procedure is called to fill in the background for
|
1789 |
* a display line. It draws 3D borders cleverly so that
|
1790 |
* adjacent chunks with the same style (whether on the same
|
1791 |
* line or different lines) have a single 3D border around
|
1792 |
* the whole region.
|
1793 |
*
|
1794 |
* Results:
|
1795 |
* There is no return value. Pixmap is filled in with background
|
1796 |
* information for dlPtr.
|
1797 |
*
|
1798 |
* Side effects:
|
1799 |
* None.
|
1800 |
*
|
1801 |
*--------------------------------------------------------------
|
1802 |
*/
|
1803 |
|
1804 |
static void
|
1805 |
DisplayLineBackground(textPtr, dlPtr, prevPtr, pixmap)
|
1806 |
TkText *textPtr; /* Text widget containing line. */
|
1807 |
register DLine *dlPtr; /* Information about line to draw. */
|
1808 |
DLine *prevPtr; /* Line just above dlPtr, or NULL if dlPtr
|
1809 |
* is the top-most line in the window. */
|
1810 |
Pixmap pixmap; /* Pixmap to use for double-buffering.
|
1811 |
* Caller must make sure it's large enough
|
1812 |
* to hold line. Caller must also have
|
1813 |
* filled it with the background color for
|
1814 |
* the widget. */
|
1815 |
{
|
1816 |
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
1817 |
TkTextDispChunk *chunkPtr; /* Pointer to chunk in the current line. */
|
1818 |
TkTextDispChunk *chunkPtr2; /* Pointer to chunk in the line above or
|
1819 |
* below the current one. NULL if we're to
|
1820 |
* the left of or to the right of the chunks
|
1821 |
* in the line. */
|
1822 |
TkTextDispChunk *nextPtr2; /* Next chunk after chunkPtr2 (it's not the
|
1823 |
* same as chunkPtr2->nextPtr in the case
|
1824 |
* where chunkPtr2 is NULL because the line
|
1825 |
* is indented). */
|
1826 |
int leftX; /* The left edge of the region we're
|
1827 |
* currently working on. */
|
1828 |
int leftXIn; /* 1 means beveled edge at leftX slopes right
|
1829 |
* as it goes down, 0 means it slopes left
|
1830 |
* as it goes down. */
|
1831 |
int rightX; /* Right edge of chunkPtr. */
|
1832 |
int rightX2; /* Right edge of chunkPtr2. */
|
1833 |
int matchLeft; /* Does the style of this line match that
|
1834 |
* of its neighbor just to the left of
|
1835 |
* the current x coordinate? */
|
1836 |
int matchRight; /* Does line's style match its neighbor
|
1837 |
* just to the right of the current x-coord? */
|
1838 |
int minX, maxX, xOffset;
|
1839 |
StyleValues *sValuePtr;
|
1840 |
Display *display;
|
1841 |
|
1842 |
|
1843 |
/*
|
1844 |
* Pass 1: scan through dlPtr from left to right. For each range of
|
1845 |
* chunks with the same style, draw the main background for the style
|
1846 |
* plus the vertical parts of the 3D borders (the left and right
|
1847 |
* edges).
|
1848 |
*/
|
1849 |
|
1850 |
display = Tk_Display(textPtr->tkwin);
|
1851 |
minX = dInfoPtr->curPixelOffset;
|
1852 |
xOffset = dInfoPtr->x - minX;
|
1853 |
maxX = minX + dInfoPtr->maxX - dInfoPtr->x;
|
1854 |
chunkPtr = dlPtr->chunkPtr;
|
1855 |
|
1856 |
/*
|
1857 |
* Note A: in the following statement, and a few others later in
|
1858 |
* this file marked with "See Note A above", the right side of the
|
1859 |
* assignment was replaced with 0 on 6/18/97. This has the effect
|
1860 |
* of highlighting the empty space to the left of a line whenever
|
1861 |
* the leftmost character of the line is highlighted. This way,
|
1862 |
* multi-line highlights always line up along their left edges.
|
1863 |
* However, this may look funny in the case where a single word is
|
1864 |
* highlighted. To undo the change, replace "leftX = 0" with "leftX
|
1865 |
* = chunkPtr->x" and "rightX2 = 0" with "rightX2 = nextPtr2->x"
|
1866 |
* here and at all the marked points below. This restores the old
|
1867 |
* behavior where empty space to the left of a line is not
|
1868 |
* highlighted, leaving a ragged left edge for multi-line
|
1869 |
* highlights.
|
1870 |
*/
|
1871 |
|
1872 |
leftX = 0;
|
1873 |
for (; leftX < maxX; chunkPtr = chunkPtr->nextPtr) {
|
1874 |
if ((chunkPtr->nextPtr != NULL)
|
1875 |
&& SAME_BACKGROUND(chunkPtr->nextPtr->stylePtr,
|
1876 |
chunkPtr->stylePtr)) {
|
1877 |
continue;
|
1878 |
}
|
1879 |
sValuePtr = chunkPtr->stylePtr->sValuePtr;
|
1880 |
rightX = chunkPtr->x + chunkPtr->width;
|
1881 |
if ((chunkPtr->nextPtr == NULL) && (rightX < maxX)) {
|
1882 |
rightX = maxX;
|
1883 |
}
|
1884 |
if (chunkPtr->stylePtr->bgGC != None) {
|
1885 |
XFillRectangle(display, pixmap, chunkPtr->stylePtr->bgGC,
|
1886 |
leftX + xOffset, 0, (unsigned int) (rightX - leftX),
|
1887 |
(unsigned int) dlPtr->height);
|
1888 |
if (sValuePtr->relief != TK_RELIEF_FLAT) {
|
1889 |
Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
|
1890 |
leftX + xOffset, 0, sValuePtr->borderWidth,
|
1891 |
dlPtr->height, 1, sValuePtr->relief);
|
1892 |
Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
|
1893 |
rightX - sValuePtr->borderWidth + xOffset,
|
1894 |
0, sValuePtr->borderWidth, dlPtr->height, 0,
|
1895 |
sValuePtr->relief);
|
1896 |
}
|
1897 |
}
|
1898 |
leftX = rightX;
|
1899 |
}
|
1900 |
|
1901 |
/*
|
1902 |
* Pass 2: draw the horizontal bevels along the top of the line. To
|
1903 |
* do this, scan through dlPtr from left to right while simultaneously
|
1904 |
* scanning through the line just above dlPtr. ChunkPtr2 and nextPtr2
|
1905 |
* refer to two adjacent chunks in the line above.
|
1906 |
*/
|
1907 |
|
1908 |
chunkPtr = dlPtr->chunkPtr;
|
1909 |
leftX = 0; /* See Note A above. */
|
1910 |
leftXIn = 1;
|
1911 |
rightX = chunkPtr->x + chunkPtr->width;
|
1912 |
if ((chunkPtr->nextPtr == NULL) && (rightX < maxX)) {
|
1913 |
rightX = maxX;
|
1914 |
}
|
1915 |
chunkPtr2 = NULL;
|
1916 |
if (prevPtr != NULL && prevPtr->chunkPtr != NULL) {
|
1917 |
/*
|
1918 |
* Find the chunk in the previous line that covers leftX.
|
1919 |
*/
|
1920 |
|
1921 |
nextPtr2 = prevPtr->chunkPtr;
|
1922 |
rightX2 = 0; /* See Note A above. */
|
1923 |
while (rightX2 <= leftX) {
|
1924 |
chunkPtr2 = nextPtr2;
|
1925 |
if (chunkPtr2 == NULL) {
|
1926 |
break;
|
1927 |
}
|
1928 |
nextPtr2 = chunkPtr2->nextPtr;
|
1929 |
rightX2 = chunkPtr2->x + chunkPtr2->width;
|
1930 |
if (nextPtr2 == NULL) {
|
1931 |
rightX2 = INT_MAX;
|
1932 |
}
|
1933 |
}
|
1934 |
} else {
|
1935 |
nextPtr2 = NULL;
|
1936 |
rightX2 = INT_MAX;
|
1937 |
}
|
1938 |
|
1939 |
while (leftX < maxX) {
|
1940 |
matchLeft = (chunkPtr2 != NULL)
|
1941 |
&& SAME_BACKGROUND(chunkPtr2->stylePtr, chunkPtr->stylePtr);
|
1942 |
sValuePtr = chunkPtr->stylePtr->sValuePtr;
|
1943 |
if (rightX <= rightX2) {
|
1944 |
/*
|
1945 |
* The chunk in our line is about to end. If its style
|
1946 |
* changes then draw the bevel for the current style.
|
1947 |
*/
|
1948 |
|
1949 |
if ((chunkPtr->nextPtr == NULL)
|
1950 |
|| !SAME_BACKGROUND(chunkPtr->stylePtr,
|
1951 |
chunkPtr->nextPtr->stylePtr)) {
|
1952 |
if (!matchLeft && (sValuePtr->relief != TK_RELIEF_FLAT)) {
|
1953 |
Tk_3DHorizontalBevel(textPtr->tkwin, pixmap,
|
1954 |
sValuePtr->border, leftX + xOffset, 0,
|
1955 |
rightX - leftX, sValuePtr->borderWidth, leftXIn,
|
1956 |
1, 1, sValuePtr->relief);
|
1957 |
}
|
1958 |
leftX = rightX;
|
1959 |
leftXIn = 1;
|
1960 |
|
1961 |
/*
|
1962 |
* If the chunk in the line above is also ending at
|
1963 |
* the same point then advance to the next chunk in
|
1964 |
* that line.
|
1965 |
*/
|
1966 |
|
1967 |
if ((rightX == rightX2) && (chunkPtr2 != NULL)) {
|
1968 |
goto nextChunk2;
|
1969 |
}
|
1970 |
}
|
1971 |
chunkPtr = chunkPtr->nextPtr;
|
1972 |
if (chunkPtr == NULL) {
|
1973 |
break;
|
1974 |
}
|
1975 |
rightX = chunkPtr->x + chunkPtr->width;
|
1976 |
if ((chunkPtr->nextPtr == NULL) && (rightX < maxX)) {
|
1977 |
rightX = maxX;
|
1978 |
}
|
1979 |
continue;
|
1980 |
}
|
1981 |
|
1982 |
/*
|
1983 |
* The chunk in the line above is ending at an x-position where
|
1984 |
* there is no change in the style of the current line. If the
|
1985 |
* style above matches the current line on one side of the change
|
1986 |
* but not on the other, we have to draw an L-shaped piece of
|
1987 |
* bevel.
|
1988 |
*/
|
1989 |
|
1990 |
matchRight = (nextPtr2 != NULL)
|
1991 |
&& SAME_BACKGROUND(nextPtr2->stylePtr, chunkPtr->stylePtr);
|
1992 |
if (matchLeft && !matchRight) {
|
1993 |
if (sValuePtr->relief != TK_RELIEF_FLAT) {
|
1994 |
Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
|
1995 |
rightX2 - sValuePtr->borderWidth + xOffset, 0,
|
1996 |
sValuePtr->borderWidth, sValuePtr->borderWidth, 0,
|
1997 |
sValuePtr->relief);
|
1998 |
}
|
1999 |
leftX = rightX2 - sValuePtr->borderWidth;
|
2000 |
leftXIn = 0;
|
2001 |
} else if (!matchLeft && matchRight
|
2002 |
&& (sValuePtr->relief != TK_RELIEF_FLAT)) {
|
2003 |
Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
|
2004 |
rightX2 + xOffset, 0, sValuePtr->borderWidth,
|
2005 |
sValuePtr->borderWidth, 1, sValuePtr->relief);
|
2006 |
Tk_3DHorizontalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
|
2007 |
leftX + xOffset, 0, rightX2 + sValuePtr->borderWidth -leftX,
|
2008 |
sValuePtr->borderWidth, leftXIn, 0, 1,
|
2009 |
sValuePtr->relief);
|
2010 |
}
|
2011 |
|
2012 |
nextChunk2:
|
2013 |
chunkPtr2 = nextPtr2;
|
2014 |
if (chunkPtr2 == NULL) {
|
2015 |
rightX2 = INT_MAX;
|
2016 |
} else {
|
2017 |
nextPtr2 = chunkPtr2->nextPtr;
|
2018 |
rightX2 = chunkPtr2->x + chunkPtr2->width;
|
2019 |
if (nextPtr2 == NULL) {
|
2020 |
rightX2 = INT_MAX;
|
2021 |
}
|
2022 |
}
|
2023 |
}
|
2024 |
/*
|
2025 |
* Pass 3: draw the horizontal bevels along the bottom of the line.
|
2026 |
* This uses the same approach as pass 2.
|
2027 |
*/
|
2028 |
|
2029 |
chunkPtr = dlPtr->chunkPtr;
|
2030 |
leftX = 0; /* See Note A above. */
|
2031 |
leftXIn = 0;
|
2032 |
rightX = chunkPtr->x + chunkPtr->width;
|
2033 |
if ((chunkPtr->nextPtr == NULL) && (rightX < maxX)) {
|
2034 |
rightX = maxX;
|
2035 |
}
|
2036 |
chunkPtr2 = NULL;
|
2037 |
if (dlPtr->nextPtr != NULL && dlPtr->nextPtr->chunkPtr != NULL) {
|
2038 |
/*
|
2039 |
* Find the chunk in the previous line that covers leftX.
|
2040 |
*/
|
2041 |
|
2042 |
nextPtr2 = dlPtr->nextPtr->chunkPtr;
|
2043 |
rightX2 = 0; /* See Note A above. */
|
2044 |
while (rightX2 <= leftX) {
|
2045 |
chunkPtr2 = nextPtr2;
|
2046 |
if (chunkPtr2 == NULL) {
|
2047 |
break;
|
2048 |
}
|
2049 |
nextPtr2 = chunkPtr2->nextPtr;
|
2050 |
rightX2 = chunkPtr2->x + chunkPtr2->width;
|
2051 |
if (nextPtr2 == NULL) {
|
2052 |
rightX2 = INT_MAX;
|
2053 |
}
|
2054 |
}
|
2055 |
} else {
|
2056 |
nextPtr2 = NULL;
|
2057 |
rightX2 = INT_MAX;
|
2058 |
}
|
2059 |
|
2060 |
while (leftX < maxX) {
|
2061 |
matchLeft = (chunkPtr2 != NULL)
|
2062 |
&& SAME_BACKGROUND(chunkPtr2->stylePtr, chunkPtr->stylePtr);
|
2063 |
sValuePtr = chunkPtr->stylePtr->sValuePtr;
|
2064 |
if (rightX <= rightX2) {
|
2065 |
if ((chunkPtr->nextPtr == NULL)
|
2066 |
|| !SAME_BACKGROUND(chunkPtr->stylePtr,
|
2067 |
chunkPtr->nextPtr->stylePtr)) {
|
2068 |
if (!matchLeft && (sValuePtr->relief != TK_RELIEF_FLAT)) {
|
2069 |
Tk_3DHorizontalBevel(textPtr->tkwin, pixmap,
|
2070 |
sValuePtr->border, leftX + xOffset,
|
2071 |
dlPtr->height - sValuePtr->borderWidth,
|
2072 |
rightX - leftX, sValuePtr->borderWidth, leftXIn,
|
2073 |
0, 0, sValuePtr->relief);
|
2074 |
}
|
2075 |
leftX = rightX;
|
2076 |
leftXIn = 0;
|
2077 |
if ((rightX == rightX2) && (chunkPtr2 != NULL)) {
|
2078 |
goto nextChunk2b;
|
2079 |
}
|
2080 |
}
|
2081 |
chunkPtr = chunkPtr->nextPtr;
|
2082 |
if (chunkPtr == NULL) {
|
2083 |
break;
|
2084 |
}
|
2085 |
rightX = chunkPtr->x + chunkPtr->width;
|
2086 |
if ((chunkPtr->nextPtr == NULL) && (rightX < maxX)) {
|
2087 |
rightX = maxX;
|
2088 |
}
|
2089 |
continue;
|
2090 |
}
|
2091 |
|
2092 |
matchRight = (nextPtr2 != NULL)
|
2093 |
&& SAME_BACKGROUND(nextPtr2->stylePtr, chunkPtr->stylePtr);
|
2094 |
if (matchLeft && !matchRight) {
|
2095 |
if (sValuePtr->relief != TK_RELIEF_FLAT) {
|
2096 |
Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
|
2097 |
rightX2 - sValuePtr->borderWidth + xOffset,
|
2098 |
dlPtr->height - sValuePtr->borderWidth,
|
2099 |
sValuePtr->borderWidth, sValuePtr->borderWidth, 0,
|
2100 |
sValuePtr->relief);
|
2101 |
}
|
2102 |
leftX = rightX2 - sValuePtr->borderWidth;
|
2103 |
leftXIn = 1;
|
2104 |
} else if (!matchLeft && matchRight
|
2105 |
&& (sValuePtr->relief != TK_RELIEF_FLAT)) {
|
2106 |
Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
|
2107 |
rightX2 + xOffset, dlPtr->height - sValuePtr->borderWidth,
|
2108 |
sValuePtr->borderWidth, sValuePtr->borderWidth,
|
2109 |
1, sValuePtr->relief);
|
2110 |
Tk_3DHorizontalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
|
2111 |
leftX + xOffset, dlPtr->height - sValuePtr->borderWidth,
|
2112 |
rightX2 + sValuePtr->borderWidth - leftX,
|
2113 |
sValuePtr->borderWidth, leftXIn, 1, 0, sValuePtr->relief);
|
2114 |
}
|
2115 |
|
2116 |
nextChunk2b:
|
2117 |
chunkPtr2 = nextPtr2;
|
2118 |
if (chunkPtr2 == NULL) {
|
2119 |
rightX2 = INT_MAX;
|
2120 |
} else {
|
2121 |
nextPtr2 = chunkPtr2->nextPtr;
|
2122 |
rightX2 = chunkPtr2->x + chunkPtr2->width;
|
2123 |
if (nextPtr2 == NULL) {
|
2124 |
rightX2 = INT_MAX;
|
2125 |
}
|
2126 |
}
|
2127 |
}
|
2128 |
}
|
2129 |
|
2130 |
/*
|
2131 |
*----------------------------------------------------------------------
|
2132 |
*
|
2133 |
* DisplayText --
|
2134 |
*
|
2135 |
* This procedure is invoked as a when-idle handler to update the
|
2136 |
* display. It only redisplays the parts of the text widget that
|
2137 |
* are out of date.
|
2138 |
*
|
2139 |
* Results:
|
2140 |
* None.
|
2141 |
*
|
2142 |
* Side effects:
|
2143 |
* Information is redrawn on the screen.
|
2144 |
*
|
2145 |
*----------------------------------------------------------------------
|
2146 |
*/
|
2147 |
|
2148 |
static void
|
2149 |
DisplayText(clientData)
|
2150 |
ClientData clientData; /* Information about widget. */
|
2151 |
{
|
2152 |
register TkText *textPtr = (TkText *) clientData;
|
2153 |
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
2154 |
Tk_Window tkwin;
|
2155 |
register DLine *dlPtr;
|
2156 |
DLine *prevPtr;
|
2157 |
Pixmap pixmap;
|
2158 |
int maxHeight, borders;
|
2159 |
int bottomY = 0; /* Initialization needed only to stop
|
2160 |
* compiler warnings. */
|
2161 |
Tcl_Interp *interp;
|
2162 |
|
2163 |
if (textPtr->tkwin == NULL) {
|
2164 |
|
2165 |
/*
|
2166 |
* The widget has been deleted. Don't do anything.
|
2167 |
*/
|
2168 |
|
2169 |
return;
|
2170 |
}
|
2171 |
|
2172 |
interp = textPtr->interp;
|
2173 |
Tcl_Preserve((ClientData) interp);
|
2174 |
|
2175 |
if (tkTextDebug) {
|
2176 |
Tcl_SetVar2(interp, "tk_textRelayout", (char *) NULL, "",
|
2177 |
TCL_GLOBAL_ONLY);
|
2178 |
}
|
2179 |
|
2180 |
if (textPtr->tkwin == NULL) {
|
2181 |
|
2182 |
/*
|
2183 |
* The widget has been deleted. Don't do anything.
|
2184 |
*/
|
2185 |
|
2186 |
goto end;
|
2187 |
}
|
2188 |
|
2189 |
if (!Tk_IsMapped(textPtr->tkwin) || (dInfoPtr->maxX <= dInfoPtr->x)
|
2190 |
|| (dInfoPtr->maxY <= dInfoPtr->y)) {
|
2191 |
UpdateDisplayInfo(textPtr);
|
2192 |
dInfoPtr->flags &= ~REDRAW_PENDING;
|
2193 |
goto doScrollbars;
|
2194 |
}
|
2195 |
numRedisplays++;
|
2196 |
if (tkTextDebug) {
|
2197 |
Tcl_SetVar2(interp, "tk_textRedraw", (char *) NULL, "",
|
2198 |
TCL_GLOBAL_ONLY);
|
2199 |
}
|
2200 |
|
2201 |
if (textPtr->tkwin == NULL) {
|
2202 |
|
2203 |
/*
|
2204 |
* The widget has been deleted. Don't do anything.
|
2205 |
*/
|
2206 |
|
2207 |
goto end;
|
2208 |
}
|
2209 |
|
2210 |
/*
|
2211 |
* Choose a new current item if that is needed (this could cause
|
2212 |
* event handlers to be invoked, hence the preserve/release calls
|
2213 |
* and the loop, since the handlers could conceivably necessitate
|
2214 |
* yet another current item calculation). The tkwin check is because
|
2215 |
* the whole window could go away in the Tcl_Release call.
|
2216 |
*/
|
2217 |
|
2218 |
while (dInfoPtr->flags & REPICK_NEEDED) {
|
2219 |
Tcl_Preserve((ClientData) textPtr);
|
2220 |
dInfoPtr->flags &= ~REPICK_NEEDED;
|
2221 |
TkTextPickCurrent(textPtr, &textPtr->pickEvent);
|
2222 |
tkwin = textPtr->tkwin;
|
2223 |
Tcl_Release((ClientData) textPtr);
|
2224 |
if (tkwin == NULL) {
|
2225 |
goto end;
|
2226 |
}
|
2227 |
}
|
2228 |
|
2229 |
/*
|
2230 |
* First recompute what's supposed to be displayed.
|
2231 |
*/
|
2232 |
|
2233 |
UpdateDisplayInfo(textPtr);
|
2234 |
dInfoPtr->dLinesInvalidated = 0;
|
2235 |
|
2236 |
/*
|
2237 |
* See if it's possible to bring some parts of the screen up-to-date
|
2238 |
* by scrolling (copying from other parts of the screen).
|
2239 |
*/
|
2240 |
|
2241 |
for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL; dlPtr = dlPtr->nextPtr) {
|
2242 |
register DLine *dlPtr2;
|
2243 |
int offset, height, y, oldY;
|
2244 |
TkRegion damageRgn;
|
2245 |
|
2246 |
if ((dlPtr->oldY == -1) || (dlPtr->y == dlPtr->oldY)
|
2247 |
|| ((dlPtr->oldY + dlPtr->height) > dInfoPtr->maxY)) {
|
2248 |
continue;
|
2249 |
}
|
2250 |
|
2251 |
/*
|
2252 |
* This line is already drawn somewhere in the window so it only
|
2253 |
* needs to be copied to its new location. See if there's a group
|
2254 |
* of lines that can all be copied together.
|
2255 |
*/
|
2256 |
|
2257 |
offset = dlPtr->y - dlPtr->oldY;
|
2258 |
height = dlPtr->height;
|
2259 |
y = dlPtr->y;
|
2260 |
for (dlPtr2 = dlPtr->nextPtr; dlPtr2 != NULL;
|
2261 |
dlPtr2 = dlPtr2->nextPtr) {
|
2262 |
if ((dlPtr2->oldY == -1)
|
2263 |
|| ((dlPtr2->oldY + offset) != dlPtr2->y)
|
2264 |
|| ((dlPtr2->oldY + dlPtr2->height) > dInfoPtr->maxY)) {
|
2265 |
break;
|
2266 |
}
|
2267 |
height += dlPtr2->height;
|
2268 |
}
|
2269 |
|
2270 |
/*
|
2271 |
* Reduce the height of the area being copied if necessary to
|
2272 |
* avoid overwriting the border area.
|
2273 |
*/
|
2274 |
|
2275 |
if ((y + height) > dInfoPtr->maxY) {
|
2276 |
height = dInfoPtr->maxY -y;
|
2277 |
}
|
2278 |
oldY = dlPtr->oldY;
|
2279 |
|
2280 |
/*
|
2281 |
* Update the lines we are going to scroll to show that they
|
2282 |
* have been copied.
|
2283 |
*/
|
2284 |
|
2285 |
while (1) {
|
2286 |
dlPtr->oldY = dlPtr->y;
|
2287 |
if (dlPtr->nextPtr == dlPtr2) {
|
2288 |
break;
|
2289 |
}
|
2290 |
dlPtr = dlPtr->nextPtr;
|
2291 |
}
|
2292 |
|
2293 |
/*
|
2294 |
* Scan through the lines following the copied ones to see if
|
2295 |
* we are going to overwrite them with the copy operation.
|
2296 |
* If so, mark them for redisplay.
|
2297 |
*/
|
2298 |
|
2299 |
for ( ; dlPtr2 != NULL; dlPtr2 = dlPtr2->nextPtr) {
|
2300 |
if ((dlPtr2->oldY != -1)
|
2301 |
&& ((dlPtr2->oldY + dlPtr2->height) > y)
|
2302 |
&& (dlPtr2->oldY < (y + height))) {
|
2303 |
dlPtr2->oldY = -1;
|
2304 |
}
|
2305 |
}
|
2306 |
|
2307 |
/*
|
2308 |
* Now scroll the lines. This may generate damage which we
|
2309 |
* handle by calling TextInvalidateRegion to mark the display
|
2310 |
* blocks as stale.
|
2311 |
*/
|
2312 |
|
2313 |
damageRgn = TkCreateRegion();
|
2314 |
if (TkScrollWindow(textPtr->tkwin, dInfoPtr->scrollGC,
|
2315 |
dInfoPtr->x, oldY,
|
2316 |
(dInfoPtr->maxX - dInfoPtr->x), height,
|
2317 |
0, y - oldY, damageRgn)) {
|
2318 |
TextInvalidateRegion(textPtr, damageRgn);
|
2319 |
}
|
2320 |
numCopies++;
|
2321 |
TkDestroyRegion(damageRgn);
|
2322 |
}
|
2323 |
|
2324 |
/*
|
2325 |
* Clear the REDRAW_PENDING flag here. This is actually pretty
|
2326 |
* tricky. We want to wait until *after* doing the scrolling,
|
2327 |
* since that could generate more areas to redraw and don't
|
2328 |
* want to reschedule a redisplay for them. On the other hand,
|
2329 |
* we can't wait until after all the redisplaying, because the
|
2330 |
* act of redisplaying could actually generate more redisplays
|
2331 |
* (e.g. in the case of a nested window with event bindings triggered
|
2332 |
* by redisplay).
|
2333 |
*/
|
2334 |
|
2335 |
dInfoPtr->flags &= ~REDRAW_PENDING;
|
2336 |
|
2337 |
/*
|
2338 |
* Redraw the borders if that's needed.
|
2339 |
*/
|
2340 |
|
2341 |
if (dInfoPtr->flags & REDRAW_BORDERS) {
|
2342 |
if (tkTextDebug) {
|
2343 |
Tcl_SetVar2(interp, "tk_textRedraw", (char *) NULL, "borders",
|
2344 |
TCL_GLOBAL_ONLY|TCL_APPEND_VALUE|TCL_LIST_ELEMENT);
|
2345 |
}
|
2346 |
|
2347 |
if (textPtr->tkwin == NULL) {
|
2348 |
|
2349 |
/*
|
2350 |
* The widget has been deleted. Don't do anything.
|
2351 |
*/
|
2352 |
|
2353 |
goto end;
|
2354 |
}
|
2355 |
|
2356 |
Tk_Draw3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin),
|
2357 |
textPtr->border, textPtr->highlightWidth,
|
2358 |
textPtr->highlightWidth,
|
2359 |
Tk_Width(textPtr->tkwin) - 2*textPtr->highlightWidth,
|
2360 |
Tk_Height(textPtr->tkwin) - 2*textPtr->highlightWidth,
|
2361 |
textPtr->borderWidth, textPtr->relief);
|
2362 |
if (textPtr->highlightWidth != 0) {
|
2363 |
GC fgGC, bgGC;
|
2364 |
|
2365 |
bgGC = Tk_GCForColor(textPtr->highlightBgColorPtr,
|
2366 |
Tk_WindowId(textPtr->tkwin));
|
2367 |
if (textPtr->flags & GOT_FOCUS) {
|
2368 |
fgGC = Tk_GCForColor(textPtr->highlightColorPtr,
|
2369 |
Tk_WindowId(textPtr->tkwin));
|
2370 |
TkpDrawHighlightBorder(textPtr->tkwin, fgGC, bgGC,
|
2371 |
textPtr->highlightWidth, Tk_WindowId(textPtr->tkwin));
|
2372 |
} else {
|
2373 |
TkpDrawHighlightBorder(textPtr->tkwin, bgGC, bgGC,
|
2374 |
textPtr->highlightWidth, Tk_WindowId(textPtr->tkwin));
|
2375 |
}
|
2376 |
}
|
2377 |
borders = textPtr->borderWidth + textPtr->highlightWidth;
|
2378 |
if (textPtr->padY > 0) {
|
2379 |
Tk_Fill3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin),
|
2380 |
textPtr->border, borders, borders,
|
2381 |
Tk_Width(textPtr->tkwin) - 2*borders, textPtr->padY,
|
2382 |
0, TK_RELIEF_FLAT);
|
2383 |
Tk_Fill3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin),
|
2384 |
textPtr->border, borders,
|
2385 |
Tk_Height(textPtr->tkwin) - borders - textPtr->padY,
|
2386 |
Tk_Width(textPtr->tkwin) - 2*borders,
|
2387 |
textPtr->padY, 0, TK_RELIEF_FLAT);
|
2388 |
}
|
2389 |
if (textPtr->padX > 0) {
|
2390 |
Tk_Fill3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin),
|
2391 |
textPtr->border, borders, borders + textPtr->padY,
|
2392 |
textPtr->padX,
|
2393 |
Tk_Height(textPtr->tkwin) - 2*borders -2*textPtr->padY,
|
2394 |
0, TK_RELIEF_FLAT);
|
2395 |
Tk_Fill3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin),
|
2396 |
textPtr->border,
|
2397 |
Tk_Width(textPtr->tkwin) - borders - textPtr->padX,
|
2398 |
borders + textPtr->padY, textPtr->padX,
|
2399 |
Tk_Height(textPtr->tkwin) - 2*borders -2*textPtr->padY,
|
2400 |
0, TK_RELIEF_FLAT);
|
2401 |
}
|
2402 |
dInfoPtr->flags &= ~REDRAW_BORDERS;
|
2403 |
}
|
2404 |
|
2405 |
/*
|
2406 |
* Now we have to redraw the lines that couldn't be updated by
|
2407 |
* scrolling. First, compute the height of the largest line and
|
2408 |
* allocate an off-screen pixmap to use for double-buffered
|
2409 |
* displays.
|
2410 |
*/
|
2411 |
|
2412 |
maxHeight = -1;
|
2413 |
for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL;
|
2414 |
dlPtr = dlPtr->nextPtr) {
|
2415 |
if ((dlPtr->height > maxHeight) && (dlPtr->oldY != dlPtr->y)) {
|
2416 |
maxHeight = dlPtr->height;
|
2417 |
}
|
2418 |
bottomY = dlPtr->y + dlPtr->height;
|
2419 |
}
|
2420 |
if (maxHeight > dInfoPtr->maxY) {
|
2421 |
maxHeight = dInfoPtr->maxY;
|
2422 |
}
|
2423 |
if (maxHeight > 0) {
|
2424 |
pixmap = Tk_GetPixmap(Tk_Display(textPtr->tkwin),
|
2425 |
Tk_WindowId(textPtr->tkwin), Tk_Width(textPtr->tkwin),
|
2426 |
maxHeight, Tk_Depth(textPtr->tkwin));
|
2427 |
for (prevPtr = NULL, dlPtr = textPtr->dInfoPtr->dLinePtr;
|
2428 |
(dlPtr != NULL) && (dlPtr->y < dInfoPtr->maxY);
|
2429 |
prevPtr = dlPtr, dlPtr = dlPtr->nextPtr) {
|
2430 |
if (dlPtr->chunkPtr == NULL) continue;
|
2431 |
if (dlPtr->oldY != dlPtr->y) {
|
2432 |
if (tkTextDebug) {
|
2433 |
char string[TK_POS_CHARS];
|
2434 |
TkTextPrintIndex(&dlPtr->index, string);
|
2435 |
Tcl_SetVar2(textPtr->interp, "tk_textRedraw",
|
2436 |
(char *) NULL, string,
|
2437 |
TCL_GLOBAL_ONLY|TCL_APPEND_VALUE|TCL_LIST_ELEMENT);
|
2438 |
}
|
2439 |
DisplayDLine(textPtr, dlPtr, prevPtr, pixmap);
|
2440 |
if (dInfoPtr->dLinesInvalidated) {
|
2441 |
Tk_FreePixmap(Tk_Display(textPtr->tkwin), pixmap);
|
2442 |
return;
|
2443 |
}
|
2444 |
dlPtr->oldY = dlPtr->y;
|
2445 |
dlPtr->flags &= ~NEW_LAYOUT;
|
2446 |
}
|
2447 |
/*prevPtr = dlPtr;*/
|
2448 |
}
|
2449 |
Tk_FreePixmap(Tk_Display(textPtr->tkwin), pixmap);
|
2450 |
}
|
2451 |
|
2452 |
/*
|
2453 |
* See if we need to refresh the part of the window below the
|
2454 |
* last line of text (if there is any such area). Refresh the
|
2455 |
* padding area on the left too, since the insertion cursor might
|
2456 |
* have been displayed there previously).
|
2457 |
*/
|
2458 |
|
2459 |
if (dInfoPtr->topOfEof > dInfoPtr->maxY) {
|
2460 |
dInfoPtr->topOfEof = dInfoPtr->maxY;
|
2461 |
}
|
2462 |
if (bottomY < dInfoPtr->topOfEof) {
|
2463 |
if (tkTextDebug) {
|
2464 |
Tcl_SetVar2(textPtr->interp, "tk_textRedraw",
|
2465 |
(char *) NULL, "eof",
|
2466 |
TCL_GLOBAL_ONLY|TCL_APPEND_VALUE|TCL_LIST_ELEMENT);
|
2467 |
}
|
2468 |
|
2469 |
if (textPtr->tkwin == NULL) {
|
2470 |
|
2471 |
/*
|
2472 |
* The widget has been deleted. Don't do anything.
|
2473 |
*/
|
2474 |
|
2475 |
goto end;
|
2476 |
}
|
2477 |
|
2478 |
Tk_Fill3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin),
|
2479 |
textPtr->border, dInfoPtr->x - textPtr->padX, bottomY,
|
2480 |
dInfoPtr->maxX - (dInfoPtr->x - textPtr->padX),
|
2481 |
dInfoPtr->topOfEof-bottomY, 0, TK_RELIEF_FLAT);
|
2482 |
}
|
2483 |
dInfoPtr->topOfEof = bottomY;
|
2484 |
|
2485 |
doScrollbars:
|
2486 |
|
2487 |
/*
|
2488 |
* Update the vertical scrollbar, if there is one. Note: it's
|
2489 |
* important to clear REDRAW_PENDING here, just in case the
|
2490 |
* scroll procedure does something that requires redisplay.
|
2491 |
*/
|
2492 |
|
2493 |
if (textPtr->flags & UPDATE_SCROLLBARS) {
|
2494 |
textPtr->flags &= ~UPDATE_SCROLLBARS;
|
2495 |
if (textPtr->yScrollCmd != NULL) {
|
2496 |
GetYView(textPtr->interp, textPtr, 1);
|
2497 |
}
|
2498 |
|
2499 |
if (textPtr->tkwin == NULL) {
|
2500 |
|
2501 |
/*
|
2502 |
* The widget has been deleted. Don't do anything.
|
2503 |
*/
|
2504 |
|
2505 |
goto end;
|
2506 |
}
|
2507 |
|
2508 |
/*
|
2509 |
* Update the horizontal scrollbar, if any.
|
2510 |
*/
|
2511 |
|
2512 |
if (textPtr->xScrollCmd != NULL) {
|
2513 |
GetXView(textPtr->interp, textPtr, 1);
|
2514 |
}
|
2515 |
}
|
2516 |
|
2517 |
end:
|
2518 |
Tcl_Release((ClientData) interp);
|
2519 |
}
|
2520 |
|
2521 |
/*
|
2522 |
*----------------------------------------------------------------------
|
2523 |
*
|
2524 |
* TkTextEventuallyRepick --
|
2525 |
*
|
2526 |
* This procedure is invoked whenever something happens that
|
2527 |
* could change the current character or the tags associated
|
2528 |
* with it.
|
2529 |
*
|
2530 |
* Results:
|
2531 |
* None.
|
2532 |
*
|
2533 |
* Side effects:
|
2534 |
* A repick is scheduled as an idle handler.
|
2535 |
*
|
2536 |
*----------------------------------------------------------------------
|
2537 |
*/
|
2538 |
|
2539 |
/* ARGSUSED */
|
2540 |
void
|
2541 |
TkTextEventuallyRepick(textPtr)
|
2542 |
TkText *textPtr; /* Widget record for text widget. */
|
2543 |
{
|
2544 |
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
2545 |
|
2546 |
dInfoPtr->flags |= REPICK_NEEDED;
|
2547 |
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
2548 |
dInfoPtr->flags |= REDRAW_PENDING;
|
2549 |
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
2550 |
}
|
2551 |
}
|
2552 |
|
2553 |
/*
|
2554 |
*----------------------------------------------------------------------
|
2555 |
*
|
2556 |
* TkTextRedrawRegion --
|
2557 |
*
|
2558 |
* This procedure is invoked to schedule a redisplay for a given
|
2559 |
* region of a text widget. The redisplay itself may not occur
|
2560 |
* immediately: it's scheduled as a when-idle handler.
|
2561 |
*
|
2562 |
* Results:
|
2563 |
* None.
|
2564 |
*
|
2565 |
* Side effects:
|
2566 |
* Information will eventually be redrawn on the screen.
|
2567 |
*
|
2568 |
*----------------------------------------------------------------------
|
2569 |
*/
|
2570 |
|
2571 |
/* ARGSUSED */
|
2572 |
void
|
2573 |
TkTextRedrawRegion(textPtr, x, y, width, height)
|
2574 |
TkText *textPtr; /* Widget record for text widget. */
|
2575 |
int x, y; /* Coordinates of upper-left corner of area
|
2576 |
* to be redrawn, in pixels relative to
|
2577 |
* textPtr's window. */
|
2578 |
int width, height; /* Width and height of area to be redrawn. */
|
2579 |
{
|
2580 |
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
2581 |
TkRegion damageRgn = TkCreateRegion();
|
2582 |
XRectangle rect;
|
2583 |
|
2584 |
rect.x = x;
|
2585 |
rect.y = y;
|
2586 |
rect.width = width;
|
2587 |
rect.height = height;
|
2588 |
TkUnionRectWithRegion(&rect, damageRgn, damageRgn);
|
2589 |
|
2590 |
TextInvalidateRegion(textPtr, damageRgn);
|
2591 |
|
2592 |
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
2593 |
dInfoPtr->flags |= REDRAW_PENDING;
|
2594 |
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
2595 |
}
|
2596 |
TkDestroyRegion(damageRgn);
|
2597 |
}
|
2598 |
|
2599 |
/*
|
2600 |
*----------------------------------------------------------------------
|
2601 |
*
|
2602 |
* TextInvalidateRegion --
|
2603 |
*
|
2604 |
* Mark a region of text as invalid.
|
2605 |
*
|
2606 |
* Results:
|
2607 |
* None.
|
2608 |
*
|
2609 |
* Side effects:
|
2610 |
* Updates the display information for the text widget.
|
2611 |
*
|
2612 |
*----------------------------------------------------------------------
|
2613 |
*/
|
2614 |
|
2615 |
static void
|
2616 |
TextInvalidateRegion(textPtr, region)
|
2617 |
TkText *textPtr; /* Widget record for text widget. */
|
2618 |
TkRegion region; /* Region of area to redraw. */
|
2619 |
{
|
2620 |
register DLine *dlPtr;
|
2621 |
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
2622 |
int maxY, inset;
|
2623 |
XRectangle rect;
|
2624 |
|
2625 |
/*
|
2626 |
* Find all lines that overlap the given region and mark them for
|
2627 |
* redisplay.
|
2628 |
*/
|
2629 |
|
2630 |
TkClipBox(region, &rect);
|
2631 |
maxY = rect.y + rect.height;
|
2632 |
for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL;
|
2633 |
dlPtr = dlPtr->nextPtr) {
|
2634 |
if ((dlPtr->oldY != -1) && (TkRectInRegion(region, rect.x, dlPtr->y,
|
2635 |
rect.width, (unsigned int) dlPtr->height) != RectangleOut)) {
|
2636 |
dlPtr->oldY = -1;
|
2637 |
}
|
2638 |
}
|
2639 |
if (dInfoPtr->topOfEof < maxY) {
|
2640 |
dInfoPtr->topOfEof = maxY;
|
2641 |
}
|
2642 |
|
2643 |
/*
|
2644 |
* Schedule the redisplay operation if there isn't one already
|
2645 |
* scheduled.
|
2646 |
*/
|
2647 |
|
2648 |
inset = textPtr->borderWidth + textPtr->highlightWidth;
|
2649 |
if ((rect.x < (inset + textPtr->padX))
|
2650 |
|| (rect.y < (inset + textPtr->padY))
|
2651 |
|| ((int) (rect.x + rect.width) > (Tk_Width(textPtr->tkwin)
|
2652 |
- inset - textPtr->padX))
|
2653 |
|| (maxY > (Tk_Height(textPtr->tkwin) - inset - textPtr->padY))) {
|
2654 |
dInfoPtr->flags |= REDRAW_BORDERS;
|
2655 |
}
|
2656 |
}
|
2657 |
|
2658 |
/*
|
2659 |
*----------------------------------------------------------------------
|
2660 |
*
|
2661 |
* TkTextChanged --
|
2662 |
*
|
2663 |
* This procedure is invoked when info in a text widget is about
|
2664 |
* to be modified in a way that changes how it is displayed (e.g.
|
2665 |
* characters were inserted or deleted, or tag information was
|
2666 |
* changed). This procedure must be called *before* a change is
|
2667 |
* made, so that indexes in the display information are still
|
2668 |
* valid.
|
2669 |
*
|
2670 |
* Results:
|
2671 |
* None.
|
2672 |
*
|
2673 |
* Side effects:
|
2674 |
* The range of character between index1Ptr (inclusive) and
|
2675 |
* index2Ptr (exclusive) will be redisplayed at some point in the
|
2676 |
* future (the actual redisplay is scheduled as a when-idle handler).
|
2677 |
*
|
2678 |
*----------------------------------------------------------------------
|
2679 |
*/
|
2680 |
|
2681 |
void
|
2682 |
TkTextChanged(textPtr, index1Ptr, index2Ptr)
|
2683 |
TkText *textPtr; /* Widget record for text widget. */
|
2684 |
TkTextIndex *index1Ptr; /* Index of first character to redisplay. */
|
2685 |
TkTextIndex *index2Ptr; /* Index of character just after last one
|
2686 |
* to redisplay. */
|
2687 |
{
|
2688 |
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
2689 |
DLine *firstPtr, *lastPtr;
|
2690 |
TkTextIndex rounded;
|
2691 |
|
2692 |
/*
|
2693 |
* Schedule both a redisplay and a recomputation of display information.
|
2694 |
* It's done here rather than the end of the procedure for two reasons:
|
2695 |
*
|
2696 |
* 1. If there are no display lines to update we'll want to return
|
2697 |
* immediately, well before the end of the procedure.
|
2698 |
* 2. It's important to arrange for the redisplay BEFORE calling
|
2699 |
* FreeDLines. The reason for this is subtle and has to do with
|
2700 |
* embedded windows. The chunk delete procedure for an embedded
|
2701 |
* window will schedule an idle handler to unmap the window.
|
2702 |
* However, we want the idle handler for redisplay to be called
|
2703 |
* first, so that it can put the embedded window back on the screen
|
2704 |
* again (if appropriate). This will prevent the window from ever
|
2705 |
* being unmapped, and thereby avoid flashing.
|
2706 |
*/
|
2707 |
|
2708 |
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
2709 |
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
2710 |
}
|
2711 |
dInfoPtr->flags |= REDRAW_PENDING|DINFO_OUT_OF_DATE|REPICK_NEEDED;
|
2712 |
|
2713 |
/*
|
2714 |
* Find the DLines corresponding to index1Ptr and index2Ptr. There
|
2715 |
* is one tricky thing here, which is that we have to relayout in
|
2716 |
* units of whole text lines: round index1Ptr back to the beginning
|
2717 |
* of its text line, and include all the display lines after index2,
|
2718 |
* up to the end of its text line. This is necessary because the
|
2719 |
* indices stored in the display lines will no longer be valid. It's
|
2720 |
* also needed because any edit could change the way lines wrap.
|
2721 |
*/
|
2722 |
|
2723 |
rounded = *index1Ptr;
|
2724 |
rounded.byteIndex = 0;
|
2725 |
firstPtr = FindDLine(dInfoPtr->dLinePtr, &rounded);
|
2726 |
if (firstPtr == NULL) {
|
2727 |
return;
|
2728 |
}
|
2729 |
lastPtr = FindDLine(dInfoPtr->dLinePtr, index2Ptr);
|
2730 |
while ((lastPtr != NULL)
|
2731 |
&& (lastPtr->index.linePtr == index2Ptr->linePtr)) {
|
2732 |
lastPtr = lastPtr->nextPtr;
|
2733 |
}
|
2734 |
|
2735 |
/*
|
2736 |
* Delete all the DLines from firstPtr up to but not including lastPtr.
|
2737 |
*/
|
2738 |
|
2739 |
FreeDLines(textPtr, firstPtr, lastPtr, 1);
|
2740 |
}
|
2741 |
|
2742 |
/*
|
2743 |
*----------------------------------------------------------------------
|
2744 |
*
|
2745 |
* TkTextRedrawTag --
|
2746 |
*
|
2747 |
* This procedure is invoked to request a redraw of all characters
|
2748 |
* in a given range that have a particular tag on or off. It's
|
2749 |
* called, for example, when tag options change.
|
2750 |
*
|
2751 |
* Results:
|
2752 |
* None.
|
2753 |
*
|
2754 |
* Side effects:
|
2755 |
* Information on the screen may be redrawn, and the layout of
|
2756 |
* the screen may change.
|
2757 |
*
|
2758 |
*----------------------------------------------------------------------
|
2759 |
*/
|
2760 |
|
2761 |
void
|
2762 |
TkTextRedrawTag(textPtr, index1Ptr, index2Ptr, tagPtr, withTag)
|
2763 |
TkText *textPtr; /* Widget record for text widget. */
|
2764 |
TkTextIndex *index1Ptr; /* First character in range to consider
|
2765 |
* for redisplay. NULL means start at
|
2766 |
* beginning of text. */
|
2767 |
TkTextIndex *index2Ptr; /* Character just after last one to consider
|
2768 |
* for redisplay. NULL means process all
|
2769 |
* the characters in the text. */
|
2770 |
TkTextTag *tagPtr; /* Information about tag. */
|
2771 |
int withTag; /* 1 means redraw characters that have the
|
2772 |
* tag, 0 means redraw those without. */
|
2773 |
{
|
2774 |
register DLine *dlPtr;
|
2775 |
DLine *endPtr;
|
2776 |
int tagOn;
|
2777 |
TkTextSearch search;
|
2778 |
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
2779 |
TkTextIndex *curIndexPtr;
|
2780 |
TkTextIndex endOfText, *endIndexPtr;
|
2781 |
|
2782 |
/*
|
2783 |
* Round up the starting position if it's before the first line
|
2784 |
* visible on the screen (we only care about what's on the screen).
|
2785 |
*/
|
2786 |
|
2787 |
dlPtr = dInfoPtr->dLinePtr;
|
2788 |
if (dlPtr == NULL) {
|
2789 |
return;
|
2790 |
}
|
2791 |
if ((index1Ptr == NULL) || (TkTextIndexCmp(&dlPtr->index, index1Ptr) > 0)) {
|
2792 |
index1Ptr = &dlPtr->index;
|
2793 |
}
|
2794 |
|
2795 |
/*
|
2796 |
* Set the stopping position if it wasn't specified.
|
2797 |
*/
|
2798 |
|
2799 |
if (index2Ptr == NULL) {
|
2800 |
index2Ptr = TkTextMakeByteIndex(textPtr->tree,
|
2801 |
TkBTreeNumLines(textPtr->tree), 0, &endOfText);
|
2802 |
}
|
2803 |
|
2804 |
/*
|
2805 |
* Initialize a search through all transitions on the tag, starting
|
2806 |
* with the first transition where the tag's current state is different
|
2807 |
* from what it will eventually be.
|
2808 |
*/
|
2809 |
|
2810 |
TkBTreeStartSearch(index1Ptr, index2Ptr, tagPtr, &search);
|
2811 |
/*
|
2812 |
* Make our own curIndex because at this point search.curIndex
|
2813 |
* may not equal index1Ptr->curIndex in the case the first tag toggle
|
2814 |
* comes after index1Ptr (See the use of FindTagStart in TkBTreeStartSearch)
|
2815 |
*/
|
2816 |
curIndexPtr = index1Ptr;
|
2817 |
tagOn = TkBTreeCharTagged(index1Ptr, tagPtr);
|
2818 |
if (tagOn != withTag) {
|
2819 |
if (!TkBTreeNextTag(&search)) {
|
2820 |
return;
|
2821 |
}
|
2822 |
curIndexPtr = &search.curIndex;
|
2823 |
}
|
2824 |
|
2825 |
/*
|
2826 |
* Schedule a redisplay and layout recalculation if they aren't
|
2827 |
* already pending. This has to be done before calling FreeDLines,
|
2828 |
* for the reason given in TkTextChanged.
|
2829 |
*/
|
2830 |
|
2831 |
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
2832 |
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
2833 |
}
|
2834 |
dInfoPtr->flags |= REDRAW_PENDING|DINFO_OUT_OF_DATE|REPICK_NEEDED;
|
2835 |
|
2836 |
/*
|
2837 |
* Each loop through the loop below is for one range of characters
|
2838 |
* where the tag's current state is different than its eventual
|
2839 |
* state. At the top of the loop, search contains information about
|
2840 |
* the first character in the range.
|
2841 |
*/
|
2842 |
|
2843 |
while (1) {
|
2844 |
/*
|
2845 |
* Find the first DLine structure in the range. Note: if the
|
2846 |
* desired character isn't the first in its text line, then look
|
2847 |
* for the character just before it instead. This is needed to
|
2848 |
* handle the case where the first character of a wrapped
|
2849 |
* display line just got smaller, so that it now fits on the
|
2850 |
* line before: need to relayout the line containing the
|
2851 |
* previous character.
|
2852 |
*/
|
2853 |
|
2854 |
if (curIndexPtr->byteIndex == 0) {
|
2855 |
dlPtr = FindDLine(dlPtr, curIndexPtr);
|
2856 |
} else {
|
2857 |
TkTextIndex tmp;
|
2858 |
|
2859 |
tmp = *curIndexPtr;
|
2860 |
tmp.byteIndex -= 1;
|
2861 |
dlPtr = FindDLine(dlPtr, &tmp);
|
2862 |
}
|
2863 |
if (dlPtr == NULL) {
|
2864 |
break;
|
2865 |
}
|
2866 |
|
2867 |
/*
|
2868 |
* Find the first DLine structure that's past the end of the range.
|
2869 |
*/
|
2870 |
|
2871 |
if (!TkBTreeNextTag(&search)) {
|
2872 |
endIndexPtr = index2Ptr;
|
2873 |
} else {
|
2874 |
curIndexPtr = &search.curIndex;
|
2875 |
endIndexPtr = curIndexPtr;
|
2876 |
}
|
2877 |
endPtr = FindDLine(dlPtr, endIndexPtr);
|
2878 |
if ((endPtr != NULL) && (endPtr->index.linePtr == endIndexPtr->linePtr)
|
2879 |
&& (endPtr->index.byteIndex < endIndexPtr->byteIndex)) {
|
2880 |
endPtr = endPtr->nextPtr;
|
2881 |
}
|
2882 |
|
2883 |
/*
|
2884 |
* Delete all of the display lines in the range, so that they'll
|
2885 |
* be re-layed out and redrawn.
|
2886 |
*/
|
2887 |
|
2888 |
FreeDLines(textPtr, dlPtr, endPtr, 1);
|
2889 |
dlPtr = endPtr;
|
2890 |
|
2891 |
/*
|
2892 |
* Find the first text line in the next range.
|
2893 |
*/
|
2894 |
|
2895 |
if (!TkBTreeNextTag(&search)) {
|
2896 |
break;
|
2897 |
}
|
2898 |
}
|
2899 |
}
|
2900 |
|
2901 |
/*
|
2902 |
*----------------------------------------------------------------------
|
2903 |
*
|
2904 |
* TkTextRelayoutWindow --
|
2905 |
*
|
2906 |
* This procedure is called when something has happened that
|
2907 |
* invalidates the whole layout of characters on the screen, such
|
2908 |
* as a change in a configuration option for the overall text
|
2909 |
* widget or a change in the window size. It causes all display
|
2910 |
* information to be recomputed and the window to be redrawn.
|
2911 |
*
|
2912 |
* Results:
|
2913 |
* None.
|
2914 |
*
|
2915 |
* Side effects:
|
2916 |
* All the display information will be recomputed for the window
|
2917 |
* and the window will be redrawn.
|
2918 |
*
|
2919 |
*----------------------------------------------------------------------
|
2920 |
*/
|
2921 |
|
2922 |
void
|
2923 |
TkTextRelayoutWindow(textPtr)
|
2924 |
TkText *textPtr; /* Widget record for text widget. */
|
2925 |
{
|
2926 |
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
2927 |
GC new;
|
2928 |
XGCValues gcValues;
|
2929 |
|
2930 |
/*
|
2931 |
* Schedule the window redisplay. See TkTextChanged for the
|
2932 |
* reason why this has to be done before any calls to FreeDLines.
|
2933 |
*/
|
2934 |
|
2935 |
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
2936 |
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
2937 |
}
|
2938 |
dInfoPtr->flags |= REDRAW_PENDING|REDRAW_BORDERS|DINFO_OUT_OF_DATE
|
2939 |
|REPICK_NEEDED;
|
2940 |
|
2941 |
/*
|
2942 |
* (Re-)create the graphics context for drawing the traversal
|
2943 |
* highlight.
|
2944 |
*/
|
2945 |
|
2946 |
gcValues.graphics_exposures = False;
|
2947 |
new = Tk_GetGC(textPtr->tkwin, GCGraphicsExposures, &gcValues);
|
2948 |
if (dInfoPtr->copyGC != None) {
|
2949 |
Tk_FreeGC(textPtr->display, dInfoPtr->copyGC);
|
2950 |
}
|
2951 |
dInfoPtr->copyGC = new;
|
2952 |
|
2953 |
/*
|
2954 |
* Throw away all the current layout information.
|
2955 |
*/
|
2956 |
|
2957 |
FreeDLines(textPtr, dInfoPtr->dLinePtr, (DLine *) NULL, 1);
|
2958 |
dInfoPtr->dLinePtr = NULL;
|
2959 |
|
2960 |
/*
|
2961 |
* Recompute some overall things for the layout. Even if the
|
2962 |
* window gets very small, pretend that there's at least one
|
2963 |
* pixel of drawing space in it.
|
2964 |
*/
|
2965 |
|
2966 |
if (textPtr->highlightWidth < 0) {
|
2967 |
textPtr->highlightWidth = 0;
|
2968 |
}
|
2969 |
dInfoPtr->x = textPtr->highlightWidth + textPtr->borderWidth
|
2970 |
+ textPtr->padX;
|
2971 |
dInfoPtr->y = textPtr->highlightWidth + textPtr->borderWidth
|
2972 |
+ textPtr->padY;
|
2973 |
dInfoPtr->maxX = Tk_Width(textPtr->tkwin) - textPtr->highlightWidth
|
2974 |
- textPtr->borderWidth - textPtr->padX;
|
2975 |
if (dInfoPtr->maxX <= dInfoPtr->x) {
|
2976 |
dInfoPtr->maxX = dInfoPtr->x + 1;
|
2977 |
}
|
2978 |
dInfoPtr->maxY = Tk_Height(textPtr->tkwin) - textPtr->highlightWidth
|
2979 |
- textPtr->borderWidth - textPtr->padY;
|
2980 |
if (dInfoPtr->maxY <= dInfoPtr->y) {
|
2981 |
dInfoPtr->maxY = dInfoPtr->y + 1;
|
2982 |
}
|
2983 |
dInfoPtr->topOfEof = dInfoPtr->maxY;
|
2984 |
|
2985 |
/*
|
2986 |
* If the upper-left character isn't the first in a line, recompute
|
2987 |
* it. This is necessary because a change in the window's size
|
2988 |
* or options could change the way lines wrap.
|
2989 |
*/
|
2990 |
|
2991 |
if (textPtr->topIndex.byteIndex != 0) {
|
2992 |
MeasureUp(textPtr, &textPtr->topIndex, 0, &textPtr->topIndex);
|
2993 |
}
|
2994 |
|
2995 |
/*
|
2996 |
* Invalidate cached scrollbar positions, so that scrollbars
|
2997 |
* sliders will be udpated.
|
2998 |
*/
|
2999 |
|
3000 |
dInfoPtr->xScrollFirst = dInfoPtr->xScrollLast = -1;
|
3001 |
dInfoPtr->yScrollFirst = dInfoPtr->yScrollLast = -1;
|
3002 |
}
|
3003 |
|
3004 |
/*
|
3005 |
*----------------------------------------------------------------------
|
3006 |
*
|
3007 |
* TkTextSetYView --
|
3008 |
*
|
3009 |
* This procedure is called to specify what lines are to be
|
3010 |
* displayed in a text widget.
|
3011 |
*
|
3012 |
* Results:
|
3013 |
* None.
|
3014 |
*
|
3015 |
* Side effects:
|
3016 |
* The display will (eventually) be updated so that the position
|
3017 |
* given by "indexPtr" is visible on the screen at the position
|
3018 |
* determined by "pickPlace".
|
3019 |
*
|
3020 |
*----------------------------------------------------------------------
|
3021 |
*/
|
3022 |
|
3023 |
void
|
3024 |
TkTextSetYView(textPtr, indexPtr, pickPlace)
|
3025 |
TkText *textPtr; /* Widget record for text widget. */
|
3026 |
TkTextIndex *indexPtr; /* Position that is to appear somewhere
|
3027 |
* in the view. */
|
3028 |
int pickPlace; /* 0 means topLine must appear at top of
|
3029 |
* screen. 1 means we get to pick where it
|
3030 |
* appears: minimize screen motion or else
|
3031 |
* display line at center of screen. */
|
3032 |
{
|
3033 |
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
3034 |
register DLine *dlPtr;
|
3035 |
int bottomY, close, lineIndex;
|
3036 |
TkTextIndex tmpIndex, rounded;
|
3037 |
Tk_FontMetrics fm;
|
3038 |
|
3039 |
/*
|
3040 |
* If the specified position is the extra line at the end of the
|
3041 |
* text, round it back to the last real line.
|
3042 |
*/
|
3043 |
|
3044 |
lineIndex = TkBTreeLineIndex(indexPtr->linePtr);
|
3045 |
if (lineIndex == TkBTreeNumLines(indexPtr->tree)) {
|
3046 |
TkTextIndexBackChars(indexPtr, 1, &rounded);
|
3047 |
indexPtr = &rounded;
|
3048 |
}
|
3049 |
|
3050 |
if (!pickPlace) {
|
3051 |
/*
|
3052 |
* The specified position must go at the top of the screen.
|
3053 |
* Just leave all the DLine's alone: we may be able to reuse
|
3054 |
* some of the information that's currently on the screen
|
3055 |
* without redisplaying it all.
|
3056 |
*/
|
3057 |
|
3058 |
if (indexPtr->byteIndex == 0) {
|
3059 |
textPtr->topIndex = *indexPtr;
|
3060 |
} else {
|
3061 |
MeasureUp(textPtr, indexPtr, 0, &textPtr->topIndex);
|
3062 |
}
|
3063 |
goto scheduleUpdate;
|
3064 |
}
|
3065 |
|
3066 |
/*
|
3067 |
* We have to pick where to display the index. First, bring
|
3068 |
* the display information up to date and see if the index will be
|
3069 |
* completely visible in the current screen configuration. If so
|
3070 |
* then there's nothing to do.
|
3071 |
*/
|
3072 |
|
3073 |
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
|
3074 |
UpdateDisplayInfo(textPtr);
|
3075 |
}
|
3076 |
dlPtr = FindDLine(dInfoPtr->dLinePtr, indexPtr);
|
3077 |
if (dlPtr != NULL) {
|
3078 |
if ((dlPtr->y + dlPtr->height) > dInfoPtr->maxY) {
|
3079 |
/*
|
3080 |
* Part of the line hangs off the bottom of the screen;
|
3081 |
* pretend the whole line is off-screen.
|
3082 |
*/
|
3083 |
|
3084 |
dlPtr = NULL;
|
3085 |
} else if ((dlPtr->index.linePtr == indexPtr->linePtr)
|
3086 |
&& (dlPtr->index.byteIndex <= indexPtr->byteIndex)) {
|
3087 |
return;
|
3088 |
}
|
3089 |
}
|
3090 |
|
3091 |
/*
|
3092 |
* The desired line isn't already on-screen. Figure out what
|
3093 |
* it means to be "close" to the top or bottom of the screen.
|
3094 |
* Close means within 1/3 of the screen height or within three
|
3095 |
* lines, whichever is greater. Add one extra line also, to
|
3096 |
* account for the way MeasureUp rounds.
|
3097 |
*/
|
3098 |
|
3099 |
Tk_GetFontMetrics(textPtr->tkfont, &fm);
|
3100 |
bottomY = (dInfoPtr->y + dInfoPtr->maxY + fm.linespace)/2;
|
3101 |
close = (dInfoPtr->maxY - dInfoPtr->y)/3;
|
3102 |
if (close < 3*fm.linespace) {
|
3103 |
close = 3*fm.linespace;
|
3104 |
}
|
3105 |
close += fm.linespace;
|
3106 |
if (dlPtr != NULL) {
|
3107 |
/*
|
3108 |
* The desired line is above the top of screen. If it is
|
3109 |
* "close" to the top of the window then make it the top
|
3110 |
* line on the screen.
|
3111 |
*/
|
3112 |
|
3113 |
MeasureUp(textPtr, &textPtr->topIndex, close, &tmpIndex);
|
3114 |
if (TkTextIndexCmp(&tmpIndex, indexPtr) <= 0) {
|
3115 |
MeasureUp(textPtr, indexPtr, 0, &textPtr->topIndex);
|
3116 |
goto scheduleUpdate;
|
3117 |
}
|
3118 |
} else {
|
3119 |
/*
|
3120 |
* The desired line is below the bottom of the screen. If it is
|
3121 |
* "close" to the bottom of the screen then position it at the
|
3122 |
* bottom of the screen.
|
3123 |
*/
|
3124 |
|
3125 |
MeasureUp(textPtr, indexPtr, close, &tmpIndex);
|
3126 |
if (FindDLine(dInfoPtr->dLinePtr, &tmpIndex) != NULL) {
|
3127 |
bottomY = dInfoPtr->maxY - dInfoPtr->y;
|
3128 |
}
|
3129 |
}
|
3130 |
|
3131 |
/*
|
3132 |
* Our job now is to arrange the display so that indexPtr appears
|
3133 |
* as low on the screen as possible but with its bottom no lower
|
3134 |
* than bottomY. BottomY is the bottom of the window if the
|
3135 |
* desired line is just below the current screen, otherwise it
|
3136 |
* is a half-line lower than the center of the window.
|
3137 |
*/
|
3138 |
|
3139 |
MeasureUp(textPtr, indexPtr, bottomY, &textPtr->topIndex);
|
3140 |
|
3141 |
scheduleUpdate:
|
3142 |
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
3143 |
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
3144 |
}
|
3145 |
dInfoPtr->flags |= REDRAW_PENDING|DINFO_OUT_OF_DATE|REPICK_NEEDED;
|
3146 |
}
|
3147 |
|
3148 |
/*
|
3149 |
*--------------------------------------------------------------
|
3150 |
*
|
3151 |
* MeasureUp --
|
3152 |
*
|
3153 |
* Given one index, find the index of the first character
|
3154 |
* on the highest display line that would be displayed no more
|
3155 |
* than "distance" pixels above the given index.
|
3156 |
*
|
3157 |
* Results:
|
3158 |
* *dstPtr is filled in with the index of the first character
|
3159 |
* on a display line. The display line is found by measuring
|
3160 |
* up "distance" pixels above the pixel just below an imaginary
|
3161 |
* display line that contains srcPtr. If the display line
|
3162 |
* that covers this coordinate actually extends above the
|
3163 |
* coordinate, then return the index of the next lower line
|
3164 |
* instead (i.e. the returned index will be completely visible
|
3165 |
* at or below the given y-coordinate).
|
3166 |
*
|
3167 |
* Side effects:
|
3168 |
* None.
|
3169 |
*
|
3170 |
*--------------------------------------------------------------
|
3171 |
*/
|
3172 |
|
3173 |
static void
|
3174 |
MeasureUp(textPtr, srcPtr, distance, dstPtr)
|
3175 |
TkText *textPtr; /* Text widget in which to measure. */
|
3176 |
TkTextIndex *srcPtr; /* Index of character from which to start
|
3177 |
* measuring. */
|
3178 |
int distance; /* Vertical distance in pixels measured
|
3179 |
* from the pixel just below the lowest
|
3180 |
* one in srcPtr's line. */
|
3181 |
TkTextIndex *dstPtr; /* Index to fill in with result. */
|
3182 |
{
|
3183 |
int lineNum; /* Number of current line. */
|
3184 |
int bytesToCount; /* Maximum number of bytes to measure in
|
3185 |
* current line. */
|
3186 |
TkTextIndex bestIndex; /* Best candidate seen so far for result. */
|
3187 |
TkTextIndex index;
|
3188 |
DLine *dlPtr, *lowestPtr;
|
3189 |
int noBestYet; /* 1 means bestIndex hasn't been set. */
|
3190 |
|
3191 |
noBestYet = 1;
|
3192 |
bytesToCount = srcPtr->byteIndex + 1;
|
3193 |
index.tree = srcPtr->tree;
|
3194 |
for (lineNum = TkBTreeLineIndex(srcPtr->linePtr); lineNum >= 0;
|
3195 |
lineNum--) {
|
3196 |
/*
|
3197 |
* Layout an entire text line (potentially > 1 display line).
|
3198 |
* For the first line, which contains srcPtr, only layout the
|
3199 |
* part up through srcPtr (bytesToCount is non-infinite to
|
3200 |
* accomplish this). Make a list of all the display lines
|
3201 |
* in backwards order (the lowest DLine on the screen is first
|
3202 |
* in the list).
|
3203 |
*/
|
3204 |
|
3205 |
index.linePtr = TkBTreeFindLine(srcPtr->tree, lineNum);
|
3206 |
index.byteIndex = 0;
|
3207 |
lowestPtr = NULL;
|
3208 |
do {
|
3209 |
dlPtr = LayoutDLine(textPtr, &index);
|
3210 |
dlPtr->nextPtr = lowestPtr;
|
3211 |
lowestPtr = dlPtr;
|
3212 |
TkTextIndexForwBytes(&index, dlPtr->byteCount, &index);
|
3213 |
bytesToCount -= dlPtr->byteCount;
|
3214 |
} while ((bytesToCount > 0) && (index.linePtr == dlPtr->index.linePtr));
|
3215 |
|
3216 |
/*
|
3217 |
* Scan through the display lines to see if we've covered enough
|
3218 |
* vertical distance. If so, save the starting index for the
|
3219 |
* line at the desired location.
|
3220 |
*/
|
3221 |
|
3222 |
for (dlPtr = lowestPtr; dlPtr != NULL; dlPtr = dlPtr->nextPtr) {
|
3223 |
distance -= dlPtr->height;
|
3224 |
if (distance < 0) {
|
3225 |
*dstPtr = (noBestYet) ? dlPtr->index : bestIndex;
|
3226 |
break;
|
3227 |
}
|
3228 |
bestIndex = dlPtr->index;
|
3229 |
noBestYet = 0;
|
3230 |
}
|
3231 |
|
3232 |
/*
|
3233 |
* Discard the display lines, then either return or prepare
|
3234 |
* for the next display line to lay out.
|
3235 |
*/
|
3236 |
|
3237 |
FreeDLines(textPtr, lowestPtr, (DLine *) NULL, 0);
|
3238 |
if (distance < 0) {
|
3239 |
return;
|
3240 |
}
|
3241 |
bytesToCount = INT_MAX; /* Consider all chars. in next line. */
|
3242 |
}
|
3243 |
|
3244 |
/*
|
3245 |
* Ran off the beginning of the text. Return the first character
|
3246 |
* in the text.
|
3247 |
*/
|
3248 |
|
3249 |
TkTextMakeByteIndex(textPtr->tree, 0, 0, dstPtr);
|
3250 |
}
|
3251 |
|
3252 |
/*
|
3253 |
*--------------------------------------------------------------
|
3254 |
*
|
3255 |
* TkTextSeeCmd --
|
3256 |
*
|
3257 |
* This procedure is invoked to process the "see" option for
|
3258 |
* the widget command for text widgets. See the user documentation
|
3259 |
* for details on what it does.
|
3260 |
*
|
3261 |
* Results:
|
3262 |
* A standard Tcl result.
|
3263 |
*
|
3264 |
* Side effects:
|
3265 |
* See the user documentation.
|
3266 |
*
|
3267 |
*--------------------------------------------------------------
|
3268 |
*/
|
3269 |
|
3270 |
int
|
3271 |
TkTextSeeCmd(textPtr, interp, argc, argv)
|
3272 |
TkText *textPtr; /* Information about text widget. */
|
3273 |
Tcl_Interp *interp; /* Current interpreter. */
|
3274 |
int argc; /* Number of arguments. */
|
3275 |
char **argv; /* Argument strings. Someone else has already
|
3276 |
* parsed this command enough to know that
|
3277 |
* argv[1] is "see". */
|
3278 |
{
|
3279 |
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
3280 |
TkTextIndex index;
|
3281 |
int x, y, width, height, lineWidth, byteCount, oneThird, delta;
|
3282 |
DLine *dlPtr;
|
3283 |
TkTextDispChunk *chunkPtr;
|
3284 |
|
3285 |
if (argc != 3) {
|
3286 |
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
3287 |
argv[0], " see index\"", (char *) NULL);
|
3288 |
return TCL_ERROR;
|
3289 |
}
|
3290 |
if (TkTextGetIndex(interp, textPtr, argv[2], &index) != TCL_OK) {
|
3291 |
return TCL_ERROR;
|
3292 |
}
|
3293 |
|
3294 |
/*
|
3295 |
* If the specified position is the extra line at the end of the
|
3296 |
* text, round it back to the last real line.
|
3297 |
*/
|
3298 |
|
3299 |
if (TkBTreeLineIndex(index.linePtr) == TkBTreeNumLines(index.tree)) {
|
3300 |
TkTextIndexBackChars(&index, 1, &index);
|
3301 |
}
|
3302 |
|
3303 |
/*
|
3304 |
* First get the desired position into the vertical range of the window.
|
3305 |
*/
|
3306 |
|
3307 |
TkTextSetYView(textPtr, &index, 1);
|
3308 |
|
3309 |
/*
|
3310 |
* Now make sure that the character is in view horizontally.
|
3311 |
*/
|
3312 |
|
3313 |
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
|
3314 |
UpdateDisplayInfo(textPtr);
|
3315 |
}
|
3316 |
lineWidth = dInfoPtr->maxX - dInfoPtr->x;
|
3317 |
if (dInfoPtr->maxLength < lineWidth) {
|
3318 |
return TCL_OK;
|
3319 |
}
|
3320 |
|
3321 |
/*
|
3322 |
* Find the chunk that contains the desired index.
|
3323 |
*/
|
3324 |
|
3325 |
dlPtr = FindDLine(dInfoPtr->dLinePtr, &index);
|
3326 |
byteCount = index.byteIndex - dlPtr->index.byteIndex;
|
3327 |
for (chunkPtr = dlPtr->chunkPtr; chunkPtr!=NULL ; chunkPtr = chunkPtr->nextPtr) {
|
3328 |
if (byteCount < chunkPtr->numBytes) {
|
3329 |
break;
|
3330 |
}
|
3331 |
byteCount -= chunkPtr->numBytes;
|
3332 |
}
|
3333 |
|
3334 |
/*
|
3335 |
* Call a chunk-specific procedure to find the horizontal range of
|
3336 |
* the character within the chunk.
|
3337 |
*/
|
3338 |
|
3339 |
if (chunkPtr!=NULL) { /* chunkPtr==NULL iff trying to see in elided region */
|
3340 |
(*chunkPtr->bboxProc)(chunkPtr, byteCount, dlPtr->y + dlPtr->spaceAbove,
|
3341 |
dlPtr->height - dlPtr->spaceAbove - dlPtr->spaceBelow,
|
3342 |
dlPtr->baseline - dlPtr->spaceAbove, &x, &y, &width,
|
3343 |
&height);
|
3344 |
delta = x - dInfoPtr->curPixelOffset;
|
3345 |
oneThird = lineWidth/3;
|
3346 |
if (delta < 0) {
|
3347 |
if (delta < -oneThird) {
|
3348 |
dInfoPtr->newByteOffset = (x - lineWidth/2)/textPtr->charWidth;
|
3349 |
} else {
|
3350 |
dInfoPtr->newByteOffset -= ((-delta) + textPtr->charWidth - 1)
|
3351 |
/ textPtr->charWidth;
|
3352 |
}
|
3353 |
} else {
|
3354 |
delta -= (lineWidth - width);
|
3355 |
if (delta > 0) {
|
3356 |
if (delta > oneThird) {
|
3357 |
dInfoPtr->newByteOffset = (x - lineWidth/2)/textPtr->charWidth;
|
3358 |
} else {
|
3359 |
dInfoPtr->newByteOffset += (delta + textPtr->charWidth - 1)
|
3360 |
/ textPtr->charWidth;
|
3361 |
}
|
3362 |
} else {
|
3363 |
return TCL_OK;
|
3364 |
}
|
3365 |
}}
|
3366 |
dInfoPtr->flags |= DINFO_OUT_OF_DATE;
|
3367 |
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
3368 |
dInfoPtr->flags |= REDRAW_PENDING;
|
3369 |
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
3370 |
}
|
3371 |
return TCL_OK;
|
3372 |
}
|
3373 |
|
3374 |
/*
|
3375 |
*--------------------------------------------------------------
|
3376 |
*
|
3377 |
* TkTextXviewCmd --
|
3378 |
*
|
3379 |
* This procedure is invoked to process the "xview" option for
|
3380 |
* the widget command for text widgets. See the user documentation
|
3381 |
* for details on what it does.
|
3382 |
*
|
3383 |
* Results:
|
3384 |
* A standard Tcl result.
|
3385 |
*
|
3386 |
* Side effects:
|
3387 |
* See the user documentation.
|
3388 |
*
|
3389 |
*--------------------------------------------------------------
|
3390 |
*/
|
3391 |
|
3392 |
int
|
3393 |
TkTextXviewCmd(textPtr, interp, argc, argv)
|
3394 |
TkText *textPtr; /* Information about text widget. */
|
3395 |
Tcl_Interp *interp; /* Current interpreter. */
|
3396 |
int argc; /* Number of arguments. */
|
3397 |
char **argv; /* Argument strings. Someone else has already
|
3398 |
* parsed this command enough to know that
|
3399 |
* argv[1] is "xview". */
|
3400 |
{
|
3401 |
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
3402 |
int type, charsPerPage, count, newOffset;
|
3403 |
double fraction;
|
3404 |
|
3405 |
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
|
3406 |
UpdateDisplayInfo(textPtr);
|
3407 |
}
|
3408 |
|
3409 |
if (argc == 2) {
|
3410 |
GetXView(interp, textPtr, 0);
|
3411 |
return TCL_OK;
|
3412 |
}
|
3413 |
|
3414 |
newOffset = dInfoPtr->newByteOffset;
|
3415 |
type = Tk_GetScrollInfo(interp, argc, argv, &fraction, &count);
|
3416 |
switch (type) {
|
3417 |
case TK_SCROLL_ERROR:
|
3418 |
return TCL_ERROR;
|
3419 |
case TK_SCROLL_MOVETO:
|
3420 |
if (fraction > 1.0) {
|
3421 |
fraction = 1.0;
|
3422 |
}
|
3423 |
if (fraction < 0) {
|
3424 |
fraction = 0;
|
3425 |
}
|
3426 |
newOffset = (int) (((fraction * dInfoPtr->maxLength) / textPtr->charWidth)
|
3427 |
+ 0.5);
|
3428 |
break;
|
3429 |
case TK_SCROLL_PAGES:
|
3430 |
charsPerPage = ((dInfoPtr->maxX - dInfoPtr->x) / textPtr->charWidth)
|
3431 |
- 2;
|
3432 |
if (charsPerPage < 1) {
|
3433 |
charsPerPage = 1;
|
3434 |
}
|
3435 |
newOffset += charsPerPage * count;
|
3436 |
break;
|
3437 |
case TK_SCROLL_UNITS:
|
3438 |
newOffset += count;
|
3439 |
break;
|
3440 |
}
|
3441 |
|
3442 |
dInfoPtr->newByteOffset = newOffset;
|
3443 |
dInfoPtr->flags |= DINFO_OUT_OF_DATE;
|
3444 |
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
3445 |
dInfoPtr->flags |= REDRAW_PENDING;
|
3446 |
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
3447 |
}
|
3448 |
return TCL_OK;
|
3449 |
}
|
3450 |
|
3451 |
/*
|
3452 |
*----------------------------------------------------------------------
|
3453 |
*
|
3454 |
* ScrollByLines --
|
3455 |
*
|
3456 |
* This procedure is called to scroll a text widget up or down
|
3457 |
* by a given number of lines.
|
3458 |
*
|
3459 |
* Results:
|
3460 |
* None.
|
3461 |
*
|
3462 |
* Side effects:
|
3463 |
* The view in textPtr's window changes to reflect the value
|
3464 |
* of "offset".
|
3465 |
*
|
3466 |
*----------------------------------------------------------------------
|
3467 |
*/
|
3468 |
|
3469 |
static void
|
3470 |
ScrollByLines(textPtr, offset)
|
3471 |
TkText *textPtr; /* Widget to scroll. */
|
3472 |
int offset; /* Amount by which to scroll, in *screen*
|
3473 |
* lines. Positive means that information
|
3474 |
* later in text becomes visible, negative
|
3475 |
* means that information earlier in the
|
3476 |
* text becomes visible. */
|
3477 |
{
|
3478 |
int i, bytesToCount, lineNum;
|
3479 |
TkTextIndex new, index;
|
3480 |
TkTextLine *lastLinePtr;
|
3481 |
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
3482 |
DLine *dlPtr, *lowestPtr;
|
3483 |
|
3484 |
if (offset < 0) {
|
3485 |
/*
|
3486 |
* Must scroll up (to show earlier information in the text).
|
3487 |
* The code below is similar to that in MeasureUp, except that
|
3488 |
* it counts lines instead of pixels.
|
3489 |
*/
|
3490 |
|
3491 |
bytesToCount = textPtr->topIndex.byteIndex + 1;
|
3492 |
index.tree = textPtr->tree;
|
3493 |
offset--; /* Skip line containing topIndex. */
|
3494 |
for (lineNum = TkBTreeLineIndex(textPtr->topIndex.linePtr);
|
3495 |
lineNum >= 0; lineNum--) {
|
3496 |
index.linePtr = TkBTreeFindLine(textPtr->tree, lineNum);
|
3497 |
index.byteIndex = 0;
|
3498 |
lowestPtr = NULL;
|
3499 |
do {
|
3500 |
dlPtr = LayoutDLine(textPtr, &index);
|
3501 |
dlPtr->nextPtr = lowestPtr;
|
3502 |
lowestPtr = dlPtr;
|
3503 |
TkTextIndexForwBytes(&index, dlPtr->byteCount, &index);
|
3504 |
bytesToCount -= dlPtr->byteCount;
|
3505 |
} while ((bytesToCount > 0)
|
3506 |
&& (index.linePtr == dlPtr->index.linePtr));
|
3507 |
|
3508 |
for (dlPtr = lowestPtr; dlPtr != NULL; dlPtr = dlPtr->nextPtr) {
|
3509 |
offset++;
|
3510 |
if (offset == 0) {
|
3511 |
textPtr->topIndex = dlPtr->index;
|
3512 |
break;
|
3513 |
}
|
3514 |
}
|
3515 |
|
3516 |
/*
|
3517 |
* Discard the display lines, then either return or prepare
|
3518 |
* for the next display line to lay out.
|
3519 |
*/
|
3520 |
|
3521 |
FreeDLines(textPtr, lowestPtr, (DLine *) NULL, 0);
|
3522 |
if (offset >= 0) {
|
3523 |
goto scheduleUpdate;
|
3524 |
}
|
3525 |
bytesToCount = INT_MAX;
|
3526 |
}
|
3527 |
|
3528 |
/*
|
3529 |
* Ran off the beginning of the text. Return the first character
|
3530 |
* in the text.
|
3531 |
*/
|
3532 |
|
3533 |
TkTextMakeByteIndex(textPtr->tree, 0, 0, &textPtr->topIndex);
|
3534 |
} else {
|
3535 |
/*
|
3536 |
* Scrolling down, to show later information in the text.
|
3537 |
* Just count lines from the current top of the window.
|
3538 |
*/
|
3539 |
|
3540 |
lastLinePtr = TkBTreeFindLine(textPtr->tree,
|
3541 |
TkBTreeNumLines(textPtr->tree));
|
3542 |
for (i = 0; i < offset; i++) {
|
3543 |
dlPtr = LayoutDLine(textPtr, &textPtr->topIndex);
|
3544 |
if (dlPtr->length == 0 && dlPtr->height == 0) offset++;
|
3545 |
dlPtr->nextPtr = NULL;
|
3546 |
TkTextIndexForwBytes(&textPtr->topIndex, dlPtr->byteCount, &new);
|
3547 |
FreeDLines(textPtr, dlPtr, (DLine *) NULL, 0);
|
3548 |
if (new.linePtr == lastLinePtr) {
|
3549 |
break;
|
3550 |
}
|
3551 |
textPtr->topIndex = new;
|
3552 |
}
|
3553 |
}
|
3554 |
|
3555 |
scheduleUpdate:
|
3556 |
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
3557 |
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
3558 |
}
|
3559 |
dInfoPtr->flags |= REDRAW_PENDING|DINFO_OUT_OF_DATE|REPICK_NEEDED;
|
3560 |
}
|
3561 |
|
3562 |
/*
|
3563 |
*--------------------------------------------------------------
|
3564 |
*
|
3565 |
* TkTextYviewCmd --
|
3566 |
*
|
3567 |
* This procedure is invoked to process the "yview" option for
|
3568 |
* the widget command for text widgets. See the user documentation
|
3569 |
* for details on what it does.
|
3570 |
*
|
3571 |
* Results:
|
3572 |
* A standard Tcl result.
|
3573 |
*
|
3574 |
* Side effects:
|
3575 |
* See the user documentation.
|
3576 |
*
|
3577 |
*--------------------------------------------------------------
|
3578 |
*/
|
3579 |
|
3580 |
int
|
3581 |
TkTextYviewCmd(textPtr, interp, argc, argv)
|
3582 |
TkText *textPtr; /* Information about text widget. */
|
3583 |
Tcl_Interp *interp; /* Current interpreter. */
|
3584 |
int argc; /* Number of arguments. */
|
3585 |
char **argv; /* Argument strings. Someone else has already
|
3586 |
* parsed this command enough to know that
|
3587 |
* argv[1] is "yview". */
|
3588 |
{
|
3589 |
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
3590 |
int pickPlace, lineNum, type, bytesInLine;
|
3591 |
Tk_FontMetrics fm;
|
3592 |
int pixels, count;
|
3593 |
size_t switchLength;
|
3594 |
double fraction;
|
3595 |
TkTextIndex index, new;
|
3596 |
TkTextLine *lastLinePtr;
|
3597 |
DLine *dlPtr;
|
3598 |
|
3599 |
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
|
3600 |
UpdateDisplayInfo(textPtr);
|
3601 |
}
|
3602 |
|
3603 |
if (argc == 2) {
|
3604 |
GetYView(interp, textPtr, 0);
|
3605 |
return TCL_OK;
|
3606 |
}
|
3607 |
|
3608 |
/*
|
3609 |
* Next, handle the old syntax: "pathName yview ?-pickplace? where"
|
3610 |
*/
|
3611 |
|
3612 |
pickPlace = 0;
|
3613 |
if (argv[2][0] == '-') {
|
3614 |
switchLength = strlen(argv[2]);
|
3615 |
if ((switchLength >= 2)
|
3616 |
&& (strncmp(argv[2], "-pickplace", switchLength) == 0)) {
|
3617 |
pickPlace = 1;
|
3618 |
if (argc != 4) {
|
3619 |
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
3620 |
argv[0], " yview -pickplace lineNum|index\"",
|
3621 |
(char *) NULL);
|
3622 |
return TCL_ERROR;
|
3623 |
}
|
3624 |
}
|
3625 |
}
|
3626 |
if ((argc == 3) || pickPlace) {
|
3627 |
if (Tcl_GetInt(interp, argv[2+pickPlace], &lineNum) == TCL_OK) {
|
3628 |
TkTextMakeByteIndex(textPtr->tree, lineNum, 0, &index);
|
3629 |
TkTextSetYView(textPtr, &index, 0);
|
3630 |
return TCL_OK;
|
3631 |
}
|
3632 |
|
3633 |
/*
|
3634 |
* The argument must be a regular text index.
|
3635 |
*/
|
3636 |
|
3637 |
Tcl_ResetResult(interp);
|
3638 |
if (TkTextGetIndex(interp, textPtr, argv[2+pickPlace],
|
3639 |
&index) != TCL_OK) {
|
3640 |
return TCL_ERROR;
|
3641 |
}
|
3642 |
TkTextSetYView(textPtr, &index, pickPlace);
|
3643 |
return TCL_OK;
|
3644 |
}
|
3645 |
|
3646 |
/*
|
3647 |
* New syntax: dispatch based on argv[2].
|
3648 |
*/
|
3649 |
|
3650 |
type = Tk_GetScrollInfo(interp, argc, argv, &fraction, &count);
|
3651 |
switch (type) {
|
3652 |
case TK_SCROLL_ERROR:
|
3653 |
return TCL_ERROR;
|
3654 |
case TK_SCROLL_MOVETO:
|
3655 |
if (fraction > 1.0) {
|
3656 |
fraction = 1.0;
|
3657 |
}
|
3658 |
if (fraction < 0) {
|
3659 |
fraction = 0;
|
3660 |
}
|
3661 |
fraction *= TkBTreeNumLines(textPtr->tree);
|
3662 |
lineNum = (int) fraction;
|
3663 |
TkTextMakeByteIndex(textPtr->tree, lineNum, 0, &index);
|
3664 |
bytesInLine = TkBTreeBytesInLine(index.linePtr);
|
3665 |
index.byteIndex = (int)((bytesInLine * (fraction-lineNum)) + 0.5);
|
3666 |
if (index.byteIndex >= bytesInLine) {
|
3667 |
TkTextMakeByteIndex(textPtr->tree, lineNum + 1, 0, &index);
|
3668 |
}
|
3669 |
TkTextSetYView(textPtr, &index, 0);
|
3670 |
break;
|
3671 |
case TK_SCROLL_PAGES:
|
3672 |
/*
|
3673 |
* Scroll up or down by screenfuls. Actually, use the
|
3674 |
* window height minus two lines, so that there's some
|
3675 |
* overlap between adjacent pages.
|
3676 |
*/
|
3677 |
|
3678 |
Tk_GetFontMetrics(textPtr->tkfont, &fm);
|
3679 |
if (count < 0) {
|
3680 |
pixels = (dInfoPtr->maxY - 2*fm.linespace - dInfoPtr->y)*(-count)
|
3681 |
+ fm.linespace;
|
3682 |
MeasureUp(textPtr, &textPtr->topIndex, pixels, &new);
|
3683 |
if (TkTextIndexCmp(&textPtr->topIndex, &new) == 0) {
|
3684 |
/*
|
3685 |
* A page of scrolling ended up being less than one line.
|
3686 |
* Scroll one line anyway.
|
3687 |
*/
|
3688 |
|
3689 |
count = -1;
|
3690 |
goto scrollByLines;
|
3691 |
}
|
3692 |
textPtr->topIndex = new;
|
3693 |
} else {
|
3694 |
/*
|
3695 |
* Scrolling down by pages. Layout lines starting at the
|
3696 |
* top index and count through the desired vertical distance.
|
3697 |
*/
|
3698 |
|
3699 |
pixels = (dInfoPtr->maxY - 2*fm.linespace - dInfoPtr->y)*count;
|
3700 |
lastLinePtr = TkBTreeFindLine(textPtr->tree,
|
3701 |
TkBTreeNumLines(textPtr->tree));
|
3702 |
do {
|
3703 |
dlPtr = LayoutDLine(textPtr, &textPtr->topIndex);
|
3704 |
dlPtr->nextPtr = NULL;
|
3705 |
TkTextIndexForwBytes(&textPtr->topIndex, dlPtr->byteCount,
|
3706 |
&new);
|
3707 |
pixels -= dlPtr->height;
|
3708 |
FreeDLines(textPtr, dlPtr, (DLine *) NULL, 0);
|
3709 |
if (new.linePtr == lastLinePtr) {
|
3710 |
break;
|
3711 |
}
|
3712 |
textPtr->topIndex = new;
|
3713 |
} while (pixels > 0);
|
3714 |
}
|
3715 |
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
3716 |
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
3717 |
}
|
3718 |
dInfoPtr->flags |= REDRAW_PENDING|DINFO_OUT_OF_DATE|REPICK_NEEDED;
|
3719 |
break;
|
3720 |
case TK_SCROLL_UNITS:
|
3721 |
scrollByLines:
|
3722 |
ScrollByLines(textPtr, count);
|
3723 |
break;
|
3724 |
}
|
3725 |
return TCL_OK;
|
3726 |
}
|
3727 |
|
3728 |
/*
|
3729 |
*--------------------------------------------------------------
|
3730 |
*
|
3731 |
* TkTextScanCmd --
|
3732 |
*
|
3733 |
* This procedure is invoked to process the "scan" option for
|
3734 |
* the widget command for text widgets. See the user documentation
|
3735 |
* for details on what it does.
|
3736 |
*
|
3737 |
* Results:
|
3738 |
* A standard Tcl result.
|
3739 |
*
|
3740 |
* Side effects:
|
3741 |
* See the user documentation.
|
3742 |
*
|
3743 |
*--------------------------------------------------------------
|
3744 |
*/
|
3745 |
|
3746 |
int
|
3747 |
TkTextScanCmd(textPtr, interp, argc, argv)
|
3748 |
register TkText *textPtr; /* Information about text widget. */
|
3749 |
Tcl_Interp *interp; /* Current interpreter. */
|
3750 |
int argc; /* Number of arguments. */
|
3751 |
char **argv; /* Argument strings. Someone else has already
|
3752 |
* parsed this command enough to know that
|
3753 |
* argv[1] is "scan". */
|
3754 |
{
|
3755 |
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
3756 |
TkTextIndex index;
|
3757 |
int c, x, y, totalScroll, newByte, maxByte, gain=10;
|
3758 |
Tk_FontMetrics fm;
|
3759 |
size_t length;
|
3760 |
|
3761 |
if ((argc != 5) && (argc != 6)) {
|
3762 |
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
3763 |
argv[0], " scan mark x y\" or \"",
|
3764 |
argv[0], " scan dragto x y ?gain?\"", (char *) NULL);
|
3765 |
return TCL_ERROR;
|
3766 |
}
|
3767 |
if (Tcl_GetInt(interp, argv[3], &x) != TCL_OK) {
|
3768 |
return TCL_ERROR;
|
3769 |
}
|
3770 |
if (Tcl_GetInt(interp, argv[4], &y) != TCL_OK) {
|
3771 |
return TCL_ERROR;
|
3772 |
}
|
3773 |
if ((argc == 6) && (Tcl_GetInt(interp, argv[5], &gain) != TCL_OK))
|
3774 |
return TCL_ERROR;
|
3775 |
c = argv[2][0];
|
3776 |
length = strlen(argv[2]);
|
3777 |
if ((c == 'd') && (strncmp(argv[2], "dragto", length) == 0)) {
|
3778 |
/*
|
3779 |
* Amplify the difference between the current position and the
|
3780 |
* mark position to compute how much the view should shift, then
|
3781 |
* update the mark position to correspond to the new view. If we
|
3782 |
* run off the edge of the text, reset the mark point so that the
|
3783 |
* current position continues to correspond to the edge of the
|
3784 |
* window. This means that the picture will start dragging as
|
3785 |
* soon as the mouse reverses direction (without this reset, might
|
3786 |
* have to slide mouse a long ways back before the picture starts
|
3787 |
* moving again).
|
3788 |
*/
|
3789 |
|
3790 |
newByte = dInfoPtr->scanMarkIndex + (gain*(dInfoPtr->scanMarkX - x))
|
3791 |
/ (textPtr->charWidth);
|
3792 |
maxByte = 1 + (dInfoPtr->maxLength - (dInfoPtr->maxX - dInfoPtr->x)
|
3793 |
+ textPtr->charWidth - 1)/textPtr->charWidth;
|
3794 |
if (newByte < 0) {
|
3795 |
newByte = 0;
|
3796 |
dInfoPtr->scanMarkIndex = 0;
|
3797 |
dInfoPtr->scanMarkX = x;
|
3798 |
} else if (newByte > maxByte) {
|
3799 |
newByte = maxByte;
|
3800 |
dInfoPtr->scanMarkIndex = maxByte;
|
3801 |
dInfoPtr->scanMarkX = x;
|
3802 |
}
|
3803 |
dInfoPtr->newByteOffset = newByte;
|
3804 |
|
3805 |
Tk_GetFontMetrics(textPtr->tkfont, &fm);
|
3806 |
totalScroll = (gain*(dInfoPtr->scanMarkY - y)) / fm.linespace;
|
3807 |
if (totalScroll != dInfoPtr->scanTotalScroll) {
|
3808 |
index = textPtr->topIndex;
|
3809 |
ScrollByLines(textPtr, totalScroll-dInfoPtr->scanTotalScroll);
|
3810 |
dInfoPtr->scanTotalScroll = totalScroll;
|
3811 |
if ((index.linePtr == textPtr->topIndex.linePtr) &&
|
3812 |
(index.byteIndex == textPtr->topIndex.byteIndex)) {
|
3813 |
dInfoPtr->scanTotalScroll = 0;
|
3814 |
dInfoPtr->scanMarkY = y;
|
3815 |
}
|
3816 |
}
|
3817 |
} else if ((c == 'm') && (strncmp(argv[2], "mark", length) == 0)) {
|
3818 |
dInfoPtr->scanMarkIndex = dInfoPtr->newByteOffset;
|
3819 |
dInfoPtr->scanMarkX = x;
|
3820 |
dInfoPtr->scanTotalScroll = 0;
|
3821 |
dInfoPtr->scanMarkY = y;
|
3822 |
} else {
|
3823 |
Tcl_AppendResult(interp, "bad scan option \"", argv[2],
|
3824 |
"\": must be mark or dragto", (char *) NULL);
|
3825 |
return TCL_ERROR;
|
3826 |
}
|
3827 |
dInfoPtr->flags |= DINFO_OUT_OF_DATE;
|
3828 |
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
3829 |
dInfoPtr->flags |= REDRAW_PENDING;
|
3830 |
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
3831 |
}
|
3832 |
return TCL_OK;
|
3833 |
}
|
3834 |
|
3835 |
/*
|
3836 |
*----------------------------------------------------------------------
|
3837 |
*
|
3838 |
* GetXView --
|
3839 |
*
|
3840 |
* This procedure computes the fractions that indicate what's
|
3841 |
* visible in a text window and, optionally, evaluates a
|
3842 |
* Tcl script to report them to the text's associated scrollbar.
|
3843 |
*
|
3844 |
* Results:
|
3845 |
* If report is zero, then the interp's result is filled in with
|
3846 |
* two real numbers separated by a space, giving the position of
|
3847 |
* the left and right edges of the window as fractions from 0 to
|
3848 |
* 1, where 0 means the left edge of the text and 1 means the right
|
3849 |
* edge. If report is non-zero, then the interp's result isn't modified
|
3850 |
* directly, but instead a script is evaluated in interp to report
|
3851 |
* the new horizontal scroll position to the scrollbar (if the scroll
|
3852 |
* position hasn't changed then no script is invoked).
|
3853 |
*
|
3854 |
* Side effects:
|
3855 |
* None.
|
3856 |
*
|
3857 |
*----------------------------------------------------------------------
|
3858 |
*/
|
3859 |
|
3860 |
static void
|
3861 |
GetXView(interp, textPtr, report)
|
3862 |
Tcl_Interp *interp; /* If "report" is FALSE, string
|
3863 |
* describing visible range gets
|
3864 |
* stored in the interp's result. */
|
3865 |
TkText *textPtr; /* Information about text widget. */
|
3866 |
int report; /* Non-zero means report info to
|
3867 |
* scrollbar if it has changed. */
|
3868 |
{
|
3869 |
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
3870 |
char buffer[TCL_DOUBLE_SPACE * 2];
|
3871 |
double first, last;
|
3872 |
int code;
|
3873 |
|
3874 |
if (dInfoPtr->maxLength > 0) {
|
3875 |
first = ((double) dInfoPtr->curPixelOffset)
|
3876 |
/ dInfoPtr->maxLength;
|
3877 |
last = first + ((double) (dInfoPtr->maxX - dInfoPtr->x))
|
3878 |
/ dInfoPtr->maxLength;
|
3879 |
if (last > 1.0) {
|
3880 |
last = 1.0;
|
3881 |
}
|
3882 |
} else {
|
3883 |
first = 0;
|
3884 |
last = 1.0;
|
3885 |
}
|
3886 |
if (!report) {
|
3887 |
sprintf(buffer, "%g %g", first, last);
|
3888 |
Tcl_SetResult(interp, buffer, TCL_VOLATILE);
|
3889 |
return;
|
3890 |
}
|
3891 |
if ((first == dInfoPtr->xScrollFirst) && (last == dInfoPtr->xScrollLast)) {
|
3892 |
return;
|
3893 |
}
|
3894 |
dInfoPtr->xScrollFirst = first;
|
3895 |
dInfoPtr->xScrollLast = last;
|
3896 |
sprintf(buffer, " %g %g", first, last);
|
3897 |
code = Tcl_VarEval(interp, textPtr->xScrollCmd,
|
3898 |
buffer, (char *) NULL);
|
3899 |
if (code != TCL_OK) {
|
3900 |
Tcl_AddErrorInfo(interp,
|
3901 |
"\n (horizontal scrolling command executed by text)");
|
3902 |
Tcl_BackgroundError(interp);
|
3903 |
}
|
3904 |
}
|
3905 |
|
3906 |
/*
|
3907 |
*----------------------------------------------------------------------
|
3908 |
*
|
3909 |
* GetYView --
|
3910 |
*
|
3911 |
* This procedure computes the fractions that indicate what's
|
3912 |
* visible in a text window and, optionally, evaluates a
|
3913 |
* Tcl script to report them to the text's associated scrollbar.
|
3914 |
*
|
3915 |
* Results:
|
3916 |
* If report is zero, then the interp's result is filled in with
|
3917 |
* two real numbers separated by a space, giving the position of
|
3918 |
* the top and bottom of the window as fractions from 0 to 1, where
|
3919 |
* 0 means the beginning of the text and 1 means the end. If
|
3920 |
* report is non-zero, then the interp's result isn't modified directly,
|
3921 |
* but a script is evaluated in interp to report the new scroll
|
3922 |
* position to the scrollbar (if the scroll position hasn't changed
|
3923 |
* then no script is invoked).
|
3924 |
*
|
3925 |
* Side effects:
|
3926 |
* None.
|
3927 |
*
|
3928 |
*----------------------------------------------------------------------
|
3929 |
*/
|
3930 |
|
3931 |
static void
|
3932 |
GetYView(interp, textPtr, report)
|
3933 |
Tcl_Interp *interp; /* If "report" is FALSE, string
|
3934 |
* describing visible range gets
|
3935 |
* stored in the interp's result. */
|
3936 |
TkText *textPtr; /* Information about text widget. */
|
3937 |
int report; /* Non-zero means report info to
|
3938 |
* scrollbar if it has changed. */
|
3939 |
{
|
3940 |
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
3941 |
char buffer[TCL_DOUBLE_SPACE * 2];
|
3942 |
double first, last;
|
3943 |
DLine *dlPtr;
|
3944 |
int totalLines, code, count;
|
3945 |
|
3946 |
dlPtr = dInfoPtr->dLinePtr;
|
3947 |
totalLines = TkBTreeNumLines(textPtr->tree);
|
3948 |
first = (double) TkBTreeLineIndex(dlPtr->index.linePtr)
|
3949 |
+ (double) dlPtr->index.byteIndex
|
3950 |
/ TkBTreeBytesInLine(dlPtr->index.linePtr);
|
3951 |
first /= totalLines;
|
3952 |
while (1) {
|
3953 |
if ((dlPtr->y + dlPtr->height) > dInfoPtr->maxY) {
|
3954 |
/*
|
3955 |
* The last line is only partially visible, so don't
|
3956 |
* count its characters in what's visible.
|
3957 |
*/
|
3958 |
count = 0;
|
3959 |
break;
|
3960 |
}
|
3961 |
if (dlPtr->nextPtr == NULL) {
|
3962 |
count = dlPtr->byteCount;
|
3963 |
break;
|
3964 |
}
|
3965 |
dlPtr = dlPtr->nextPtr;
|
3966 |
}
|
3967 |
last = ((double) TkBTreeLineIndex(dlPtr->index.linePtr))
|
3968 |
+ ((double) (dlPtr->index.byteIndex + count))
|
3969 |
/ (TkBTreeBytesInLine(dlPtr->index.linePtr));
|
3970 |
last /= totalLines;
|
3971 |
if (!report) {
|
3972 |
sprintf(buffer, "%g %g", first, last);
|
3973 |
Tcl_SetResult(interp, buffer, TCL_VOLATILE);
|
3974 |
return;
|
3975 |
}
|
3976 |
if ((first == dInfoPtr->yScrollFirst) && (last == dInfoPtr->yScrollLast)) {
|
3977 |
return;
|
3978 |
}
|
3979 |
dInfoPtr->yScrollFirst = first;
|
3980 |
dInfoPtr->yScrollLast = last;
|
3981 |
sprintf(buffer, " %g %g", first, last);
|
3982 |
code = Tcl_VarEval(interp, textPtr->yScrollCmd, buffer, (char *) NULL);
|
3983 |
if (code != TCL_OK) {
|
3984 |
Tcl_AddErrorInfo(interp,
|
3985 |
"\n (vertical scrolling command executed by text)");
|
3986 |
Tcl_BackgroundError(interp);
|
3987 |
}
|
3988 |
}
|
3989 |
|
3990 |
/*
|
3991 |
*----------------------------------------------------------------------
|
3992 |
*
|
3993 |
* FindDLine --
|
3994 |
*
|
3995 |
* This procedure is called to find the DLine corresponding to a
|
3996 |
* given text index.
|
3997 |
*
|
3998 |
* Results:
|
3999 |
* The return value is a pointer to the first DLine found in the
|
4000 |
* list headed by dlPtr that displays information at or after the
|
4001 |
* specified position. If there is no such line in the list then
|
4002 |
* NULL is returned.
|
4003 |
*
|
4004 |
* Side effects:
|
4005 |
* None.
|
4006 |
*
|
4007 |
*----------------------------------------------------------------------
|
4008 |
*/
|
4009 |
|
4010 |
static DLine *
|
4011 |
FindDLine(dlPtr, indexPtr)
|
4012 |
register DLine *dlPtr; /* Pointer to first in list of DLines
|
4013 |
* to search. */
|
4014 |
TkTextIndex *indexPtr; /* Index of desired character. */
|
4015 |
{
|
4016 |
TkTextLine *linePtr;
|
4017 |
|
4018 |
if (dlPtr == NULL) {
|
4019 |
return NULL;
|
4020 |
}
|
4021 |
if (TkBTreeLineIndex(indexPtr->linePtr)
|
4022 |
< TkBTreeLineIndex(dlPtr->index.linePtr)) {
|
4023 |
/*
|
4024 |
* The first display line is already past the desired line.
|
4025 |
*/
|
4026 |
return dlPtr;
|
4027 |
}
|
4028 |
|
4029 |
/*
|
4030 |
* Find the first display line that covers the desired text line.
|
4031 |
*/
|
4032 |
|
4033 |
linePtr = dlPtr->index.linePtr;
|
4034 |
while (linePtr != indexPtr->linePtr) {
|
4035 |
while (dlPtr->index.linePtr == linePtr) {
|
4036 |
dlPtr = dlPtr->nextPtr;
|
4037 |
if (dlPtr == NULL) {
|
4038 |
return NULL;
|
4039 |
}
|
4040 |
}
|
4041 |
linePtr = TkBTreeNextLine(linePtr);
|
4042 |
if (linePtr == NULL) {
|
4043 |
panic("FindDLine reached end of text");
|
4044 |
}
|
4045 |
}
|
4046 |
if (indexPtr->linePtr != dlPtr->index.linePtr) {
|
4047 |
return dlPtr;
|
4048 |
}
|
4049 |
|
4050 |
/*
|
4051 |
* Now get to the right position within the text line.
|
4052 |
*/
|
4053 |
|
4054 |
while (indexPtr->byteIndex >= (dlPtr->index.byteIndex + dlPtr->byteCount)) {
|
4055 |
dlPtr = dlPtr->nextPtr;
|
4056 |
if ((dlPtr == NULL) || (dlPtr->index.linePtr != indexPtr->linePtr)) {
|
4057 |
break;
|
4058 |
}
|
4059 |
}
|
4060 |
return dlPtr;
|
4061 |
}
|
4062 |
|
4063 |
/*
|
4064 |
*----------------------------------------------------------------------
|
4065 |
*
|
4066 |
* TkTextPixelIndex --
|
4067 |
*
|
4068 |
* Given an (x,y) coordinate on the screen, find the location of
|
4069 |
* the character closest to that location.
|
4070 |
*
|
4071 |
* Results:
|
4072 |
* The index at *indexPtr is modified to refer to the character
|
4073 |
* on the display that is closest to (x,y).
|
4074 |
*
|
4075 |
* Side effects:
|
4076 |
* None.
|
4077 |
*
|
4078 |
*----------------------------------------------------------------------
|
4079 |
*/
|
4080 |
|
4081 |
void
|
4082 |
TkTextPixelIndex(textPtr, x, y, indexPtr)
|
4083 |
TkText *textPtr; /* Widget record for text widget. */
|
4084 |
int x, y; /* Pixel coordinates of point in widget's
|
4085 |
* window. */
|
4086 |
TkTextIndex *indexPtr; /* This index gets filled in with the
|
4087 |
* index of the character nearest to (x,y). */
|
4088 |
{
|
4089 |
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
4090 |
register DLine *dlPtr, *validdlPtr;
|
4091 |
register TkTextDispChunk *chunkPtr;
|
4092 |
|
4093 |
/*
|
4094 |
* Make sure that all of the layout information about what's
|
4095 |
* displayed where on the screen is up-to-date.
|
4096 |
*/
|
4097 |
|
4098 |
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
|
4099 |
UpdateDisplayInfo(textPtr);
|
4100 |
}
|
4101 |
|
4102 |
/*
|
4103 |
* If the coordinates are above the top of the window, then adjust
|
4104 |
* them to refer to the upper-right corner of the window. If they're
|
4105 |
* off to one side or the other, then adjust to the closest side.
|
4106 |
*/
|
4107 |
|
4108 |
if (y < dInfoPtr->y) {
|
4109 |
y = dInfoPtr->y;
|
4110 |
x = dInfoPtr->x;
|
4111 |
}
|
4112 |
if (x >= dInfoPtr->maxX) {
|
4113 |
x = dInfoPtr->maxX - 1;
|
4114 |
}
|
4115 |
if (x < dInfoPtr->x) {
|
4116 |
x = dInfoPtr->x;
|
4117 |
}
|
4118 |
|
4119 |
/*
|
4120 |
* Find the display line containing the desired y-coordinate.
|
4121 |
*/
|
4122 |
|
4123 |
for (dlPtr = validdlPtr = dInfoPtr->dLinePtr; y >= (dlPtr->y + dlPtr->height);
|
4124 |
dlPtr = dlPtr->nextPtr) {
|
4125 |
if (dlPtr->chunkPtr !=NULL) validdlPtr = dlPtr;
|
4126 |
if (dlPtr->nextPtr == NULL) {
|
4127 |
/*
|
4128 |
* Y-coordinate is off the bottom of the displayed text.
|
4129 |
* Use the last character on the last line.
|
4130 |
*/
|
4131 |
|
4132 |
x = dInfoPtr->maxX - 1;
|
4133 |
break;
|
4134 |
}
|
4135 |
}
|
4136 |
if (dlPtr->chunkPtr == NULL) dlPtr = validdlPtr;
|
4137 |
|
4138 |
|
4139 |
/*
|
4140 |
* Scan through the line's chunks to find the one that contains
|
4141 |
* the desired x-coordinate. Before doing this, translate the
|
4142 |
* x-coordinate from the coordinate system of the window to the
|
4143 |
* coordinate system of the line (to take account of x-scrolling).
|
4144 |
*/
|
4145 |
|
4146 |
*indexPtr = dlPtr->index;
|
4147 |
x = x - dInfoPtr->x + dInfoPtr->curPixelOffset;
|
4148 |
for (chunkPtr = dlPtr->chunkPtr; x >= (chunkPtr->x + chunkPtr->width);
|
4149 |
indexPtr->byteIndex += chunkPtr->numBytes,
|
4150 |
chunkPtr = chunkPtr->nextPtr) {
|
4151 |
if (chunkPtr->nextPtr == NULL) {
|
4152 |
indexPtr->byteIndex += chunkPtr->numBytes;
|
4153 |
TkTextIndexBackChars(indexPtr, 1, indexPtr);
|
4154 |
return;
|
4155 |
}
|
4156 |
}
|
4157 |
|
4158 |
/*
|
4159 |
* If the chunk has more than one byte in it, ask it which
|
4160 |
* character is at the desired location.
|
4161 |
*/
|
4162 |
|
4163 |
if (chunkPtr->numBytes > 1) {
|
4164 |
indexPtr->byteIndex += (*chunkPtr->measureProc)(chunkPtr, x);
|
4165 |
}
|
4166 |
}
|
4167 |
|
4168 |
/*
|
4169 |
*----------------------------------------------------------------------
|
4170 |
*
|
4171 |
* TkTextCharBbox --
|
4172 |
*
|
4173 |
* Given an index, find the bounding box of the screen area
|
4174 |
* occupied by that character.
|
4175 |
*
|
4176 |
* Results:
|
4177 |
* Zero is returned if the character is on the screen. -1
|
4178 |
* means the character isn't on the screen. If the return value
|
4179 |
* is 0, then the bounding box of the part of the character that's
|
4180 |
* visible on the screen is returned to *xPtr, *yPtr, *widthPtr,
|
4181 |
* and *heightPtr.
|
4182 |
*
|
4183 |
* Side effects:
|
4184 |
* None.
|
4185 |
*
|
4186 |
*----------------------------------------------------------------------
|
4187 |
*/
|
4188 |
|
4189 |
int
|
4190 |
TkTextCharBbox(textPtr, indexPtr, xPtr, yPtr, widthPtr, heightPtr)
|
4191 |
TkText *textPtr; /* Widget record for text widget. */
|
4192 |
TkTextIndex *indexPtr; /* Index of character whose bounding
|
4193 |
* box is desired. */
|
4194 |
int *xPtr, *yPtr; /* Filled with character's upper-left
|
4195 |
* coordinate. */
|
4196 |
int *widthPtr, *heightPtr; /* Filled in with character's dimensions. */
|
4197 |
{
|
4198 |
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
4199 |
DLine *dlPtr;
|
4200 |
register TkTextDispChunk *chunkPtr;
|
4201 |
int byteIndex;
|
4202 |
|
4203 |
/*
|
4204 |
* Make sure that all of the screen layout information is up to date.
|
4205 |
*/
|
4206 |
|
4207 |
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
|
4208 |
UpdateDisplayInfo(textPtr);
|
4209 |
}
|
4210 |
|
4211 |
/*
|
4212 |
* Find the display line containing the desired index.
|
4213 |
*/
|
4214 |
|
4215 |
dlPtr = FindDLine(dInfoPtr->dLinePtr, indexPtr);
|
4216 |
if ((dlPtr == NULL) || (TkTextIndexCmp(&dlPtr->index, indexPtr) > 0)) {
|
4217 |
return -1;
|
4218 |
}
|
4219 |
|
4220 |
/*
|
4221 |
* Find the chunk within the line that contains the desired
|
4222 |
* index.
|
4223 |
*/
|
4224 |
|
4225 |
byteIndex = indexPtr->byteIndex - dlPtr->index.byteIndex;
|
4226 |
for (chunkPtr = dlPtr->chunkPtr; ; chunkPtr = chunkPtr->nextPtr) {
|
4227 |
if (chunkPtr == NULL) {
|
4228 |
return -1;
|
4229 |
}
|
4230 |
if (byteIndex < chunkPtr->numBytes) {
|
4231 |
break;
|
4232 |
}
|
4233 |
byteIndex -= chunkPtr->numBytes;
|
4234 |
}
|
4235 |
|
4236 |
/*
|
4237 |
* Call a chunk-specific procedure to find the horizontal range of
|
4238 |
* the character within the chunk, then fill in the vertical range.
|
4239 |
* The x-coordinate returned by bboxProc is a coordinate within a
|
4240 |
* line, not a coordinate on the screen. Translate it to reflect
|
4241 |
* horizontal scrolling.
|
4242 |
*/
|
4243 |
|
4244 |
(*chunkPtr->bboxProc)(chunkPtr, byteIndex, dlPtr->y + dlPtr->spaceAbove,
|
4245 |
dlPtr->height - dlPtr->spaceAbove - dlPtr->spaceBelow,
|
4246 |
dlPtr->baseline - dlPtr->spaceAbove, xPtr, yPtr, widthPtr,
|
4247 |
heightPtr);
|
4248 |
*xPtr = *xPtr + dInfoPtr->x - dInfoPtr->curPixelOffset;
|
4249 |
if ((byteIndex == (chunkPtr->numBytes - 1)) && (chunkPtr->nextPtr == NULL)) {
|
4250 |
/*
|
4251 |
* Last character in display line. Give it all the space up to
|
4252 |
* the line.
|
4253 |
*/
|
4254 |
|
4255 |
if (*xPtr > dInfoPtr->maxX) {
|
4256 |
*xPtr = dInfoPtr->maxX;
|
4257 |
}
|
4258 |
*widthPtr = dInfoPtr->maxX - *xPtr;
|
4259 |
}
|
4260 |
if ((*xPtr + *widthPtr) <= dInfoPtr->x) {
|
4261 |
return -1;
|
4262 |
}
|
4263 |
if ((*xPtr + *widthPtr) > dInfoPtr->maxX) {
|
4264 |
*widthPtr = dInfoPtr->maxX - *xPtr;
|
4265 |
if (*widthPtr <= 0) {
|
4266 |
return -1;
|
4267 |
}
|
4268 |
}
|
4269 |
if ((*yPtr + *heightPtr) > dInfoPtr->maxY) {
|
4270 |
*heightPtr = dInfoPtr->maxY - *yPtr;
|
4271 |
if (*heightPtr <= 0) {
|
4272 |
return -1;
|
4273 |
}
|
4274 |
}
|
4275 |
return 0;
|
4276 |
}
|
4277 |
|
4278 |
/*
|
4279 |
*----------------------------------------------------------------------
|
4280 |
*
|
4281 |
* TkTextDLineInfo --
|
4282 |
*
|
4283 |
* Given an index, return information about the display line
|
4284 |
* containing that character.
|
4285 |
*
|
4286 |
* Results:
|
4287 |
* Zero is returned if the character is on the screen. -1
|
4288 |
* means the character isn't on the screen. If the return value
|
4289 |
* is 0, then information is returned in the variables pointed
|
4290 |
* to by xPtr, yPtr, widthPtr, heightPtr, and basePtr.
|
4291 |
*
|
4292 |
* Side effects:
|
4293 |
* None.
|
4294 |
*
|
4295 |
*----------------------------------------------------------------------
|
4296 |
*/
|
4297 |
|
4298 |
int
|
4299 |
TkTextDLineInfo(textPtr, indexPtr, xPtr, yPtr, widthPtr, heightPtr, basePtr)
|
4300 |
TkText *textPtr; /* Widget record for text widget. */
|
4301 |
TkTextIndex *indexPtr; /* Index of character whose bounding
|
4302 |
* box is desired. */
|
4303 |
int *xPtr, *yPtr; /* Filled with line's upper-left
|
4304 |
* coordinate. */
|
4305 |
int *widthPtr, *heightPtr; /* Filled in with line's dimensions. */
|
4306 |
int *basePtr; /* Filled in with the baseline position,
|
4307 |
* measured as an offset down from *yPtr. */
|
4308 |
{
|
4309 |
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
4310 |
DLine *dlPtr;
|
4311 |
int dlx;
|
4312 |
|
4313 |
/*
|
4314 |
* Make sure that all of the screen layout information is up to date.
|
4315 |
*/
|
4316 |
|
4317 |
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
|
4318 |
UpdateDisplayInfo(textPtr);
|
4319 |
}
|
4320 |
|
4321 |
/*
|
4322 |
* Find the display line containing the desired index.
|
4323 |
*/
|
4324 |
|
4325 |
dlPtr = FindDLine(dInfoPtr->dLinePtr, indexPtr);
|
4326 |
if ((dlPtr == NULL) || (TkTextIndexCmp(&dlPtr->index, indexPtr) > 0)) {
|
4327 |
return -1;
|
4328 |
}
|
4329 |
|
4330 |
dlx = (dlPtr->chunkPtr != NULL? dlPtr->chunkPtr->x: 0);
|
4331 |
*xPtr = dInfoPtr->x - dInfoPtr->curPixelOffset + dlx;
|
4332 |
*widthPtr = dlPtr->length - dlx;
|
4333 |
*yPtr = dlPtr->y;
|
4334 |
if ((dlPtr->y + dlPtr->height) > dInfoPtr->maxY) {
|
4335 |
*heightPtr = dInfoPtr->maxY - dlPtr->y;
|
4336 |
} else {
|
4337 |
*heightPtr = dlPtr->height;
|
4338 |
}
|
4339 |
*basePtr = dlPtr->baseline;
|
4340 |
return 0;
|
4341 |
}
|
4342 |
|
4343 |
static void
|
4344 |
ElideBboxProc(chunkPtr, index, y, lineHeight, baseline, xPtr, yPtr,
|
4345 |
widthPtr, heightPtr)
|
4346 |
TkTextDispChunk *chunkPtr; /* Chunk containing desired char. */
|
4347 |
int index; /* Index of desired character within
|
4348 |
* the chunk. */
|
4349 |
int y; /* Topmost pixel in area allocated
|
4350 |
* for this line. */
|
4351 |
int lineHeight; /* Height of line, in pixels. */
|
4352 |
int baseline; /* Location of line's baseline, in
|
4353 |
* pixels measured down from y. */
|
4354 |
int *xPtr, *yPtr; /* Gets filled in with coords of
|
4355 |
* character's upper-left pixel.
|
4356 |
* X-coord is in same coordinate
|
4357 |
* system as chunkPtr->x. */
|
4358 |
int *widthPtr; /* Gets filled in with width of
|
4359 |
* character, in pixels. */
|
4360 |
int *heightPtr; /* Gets filled in with height of
|
4361 |
* character, in pixels. */
|
4362 |
{
|
4363 |
*xPtr = chunkPtr->x;
|
4364 |
*yPtr = y;
|
4365 |
*widthPtr = *heightPtr = 0;
|
4366 |
}
|
4367 |
|
4368 |
|
4369 |
static int
|
4370 |
ElideMeasureProc(chunkPtr, x)
|
4371 |
TkTextDispChunk *chunkPtr; /* Chunk containing desired coord. */
|
4372 |
int x; /* X-coordinate, in same coordinate
|
4373 |
* system as chunkPtr->x. */
|
4374 |
{
|
4375 |
return 0 /*chunkPtr->numBytes - 1*/;
|
4376 |
}
|
4377 |
|
4378 |
/*
|
4379 |
*--------------------------------------------------------------
|
4380 |
*
|
4381 |
* TkTextCharLayoutProc --
|
4382 |
*
|
4383 |
* This procedure is the "layoutProc" for character segments.
|
4384 |
*
|
4385 |
n * Results:
|
4386 |
* If there is something to display for the chunk then a
|
4387 |
* non-zero value is returned and the fields of chunkPtr
|
4388 |
* will be filled in (see the declaration of TkTextDispChunk
|
4389 |
* in tkText.h for details). If zero is returned it means
|
4390 |
* that no characters from this chunk fit in the window.
|
4391 |
* If -1 is returned it means that this segment just doesn't
|
4392 |
* need to be displayed (never happens for text).
|
4393 |
*
|
4394 |
* Side effects:
|
4395 |
* Memory is allocated to hold additional information about
|
4396 |
* the chunk.
|
4397 |
*
|
4398 |
*--------------------------------------------------------------
|
4399 |
*/
|
4400 |
|
4401 |
int
|
4402 |
TkTextCharLayoutProc(textPtr, indexPtr, segPtr, byteOffset, maxX, maxBytes,
|
4403 |
noCharsYet, wrapMode, chunkPtr)
|
4404 |
TkText *textPtr; /* Text widget being layed out. */
|
4405 |
TkTextIndex *indexPtr; /* Index of first character to lay out
|
4406 |
* (corresponds to segPtr and offset). */
|
4407 |
TkTextSegment *segPtr; /* Segment being layed out. */
|
4408 |
int byteOffset; /* Byte offset within segment of first
|
4409 |
* character to consider. */
|
4410 |
int maxX; /* Chunk must not occupy pixels at this
|
4411 |
* position or higher. */
|
4412 |
int maxBytes; /* Chunk must not include more than this
|
4413 |
* many characters. */
|
4414 |
int noCharsYet; /* Non-zero means no characters have been
|
4415 |
* assigned to this display line yet. */
|
4416 |
TkWrapMode wrapMode; /* How to handle line wrapping: TEXT_WRAPMODE_CHAR,
|
4417 |
* TEXT_WRAPMODE_NONE, or TEXT_WRAPMODE_WORD. */
|
4418 |
register TkTextDispChunk *chunkPtr;
|
4419 |
/* Structure to fill in with information
|
4420 |
* about this chunk. The x field has already
|
4421 |
* been set by the caller. */
|
4422 |
{
|
4423 |
Tk_Font tkfont;
|
4424 |
int nextX, bytesThatFit, count;
|
4425 |
CharInfo *ciPtr;
|
4426 |
char *p;
|
4427 |
TkTextSegment *nextPtr;
|
4428 |
Tk_FontMetrics fm;
|
4429 |
|
4430 |
/*
|
4431 |
* Figure out how many characters will fit in the space we've got.
|
4432 |
* Include the next character, even though it won't fit completely,
|
4433 |
* if any of the following is true:
|
4434 |
* (a) the chunk contains no characters and the display line contains
|
4435 |
* no characters yet (i.e. the line isn't wide enough to hold
|
4436 |
* even a single character).
|
4437 |
* (b) at least one pixel of the character is visible, we haven't
|
4438 |
* already exceeded the character limit, and the next character
|
4439 |
* is a white space character.
|
4440 |
*/
|
4441 |
|
4442 |
p = segPtr->body.chars + byteOffset;
|
4443 |
tkfont = chunkPtr->stylePtr->sValuePtr->tkfont;
|
4444 |
bytesThatFit = MeasureChars(tkfont, p, maxBytes, chunkPtr->x, maxX, 0,
|
4445 |
&nextX);
|
4446 |
if (bytesThatFit < maxBytes) {
|
4447 |
if ((bytesThatFit == 0) && noCharsYet) {
|
4448 |
Tcl_UniChar ch;
|
4449 |
|
4450 |
bytesThatFit = MeasureChars(tkfont, p, Tcl_UtfToUniChar(p, &ch),
|
4451 |
chunkPtr->x, -1, 0, &nextX);
|
4452 |
}
|
4453 |
if ((nextX < maxX) && ((p[bytesThatFit] == ' ')
|
4454 |
|| (p[bytesThatFit] == '\t'))) {
|
4455 |
/*
|
4456 |
* Space characters are funny, in that they are considered
|
4457 |
* to fit if there is at least one pixel of space left on the
|
4458 |
* line. Just give the space character whatever space is left.
|
4459 |
*/
|
4460 |
|
4461 |
nextX = maxX;
|
4462 |
bytesThatFit++;
|
4463 |
}
|
4464 |
if (p[bytesThatFit] == '\n') {
|
4465 |
/*
|
4466 |
* A newline character takes up no space, so if the previous
|
4467 |
* character fits then so does the newline.
|
4468 |
*/
|
4469 |
|
4470 |
bytesThatFit++;
|
4471 |
}
|
4472 |
if (bytesThatFit == 0) {
|
4473 |
return 0;
|
4474 |
}
|
4475 |
}
|
4476 |
|
4477 |
Tk_GetFontMetrics(tkfont, &fm);
|
4478 |
|
4479 |
/*
|
4480 |
* Fill in the chunk structure and allocate and initialize a
|
4481 |
* CharInfo structure. If the last character is a newline
|
4482 |
* then don't bother to display it.
|
4483 |
*/
|
4484 |
|
4485 |
chunkPtr->displayProc = CharDisplayProc;
|
4486 |
chunkPtr->undisplayProc = CharUndisplayProc;
|
4487 |
chunkPtr->measureProc = CharMeasureProc;
|
4488 |
chunkPtr->bboxProc = CharBboxProc;
|
4489 |
chunkPtr->numBytes = bytesThatFit;
|
4490 |
chunkPtr->minAscent = fm.ascent + chunkPtr->stylePtr->sValuePtr->offset;
|
4491 |
chunkPtr->minDescent = fm.descent - chunkPtr->stylePtr->sValuePtr->offset;
|
4492 |
chunkPtr->minHeight = 0;
|
4493 |
chunkPtr->width = nextX - chunkPtr->x;
|
4494 |
chunkPtr->breakIndex = -1;
|
4495 |
ciPtr = (CharInfo *) ckalloc((unsigned)
|
4496 |
(sizeof(CharInfo) - 3 + bytesThatFit));
|
4497 |
chunkPtr->clientData = (ClientData) ciPtr;
|
4498 |
ciPtr->numBytes = bytesThatFit;
|
4499 |
strncpy(ciPtr->chars, p, (size_t) bytesThatFit);
|
4500 |
if (p[bytesThatFit - 1] == '\n') {
|
4501 |
ciPtr->numBytes--;
|
4502 |
}
|
4503 |
|
4504 |
/*
|
4505 |
* Compute a break location. If we're in word wrap mode, a
|
4506 |
* break can occur after any space character, or at the end of
|
4507 |
* the chunk if the next segment (ignoring those with zero size)
|
4508 |
* is not a character segment.
|
4509 |
*/
|
4510 |
|
4511 |
if (wrapMode != TEXT_WRAPMODE_WORD) {
|
4512 |
chunkPtr->breakIndex = chunkPtr->numBytes;
|
4513 |
} else {
|
4514 |
for (count = bytesThatFit, p += bytesThatFit - 1; count > 0;
|
4515 |
count--, p--) {
|
4516 |
if (isspace(UCHAR(*p))) {
|
4517 |
chunkPtr->breakIndex = count;
|
4518 |
break;
|
4519 |
}
|
4520 |
}
|
4521 |
if ((bytesThatFit + byteOffset) == segPtr->size) {
|
4522 |
for (nextPtr = segPtr->nextPtr; nextPtr != NULL;
|
4523 |
nextPtr = nextPtr->nextPtr) {
|
4524 |
if (nextPtr->size != 0) {
|
4525 |
if (nextPtr->typePtr != &tkTextCharType) {
|
4526 |
chunkPtr->breakIndex = chunkPtr->numBytes;
|
4527 |
}
|
4528 |
break;
|
4529 |
}
|
4530 |
}
|
4531 |
}
|
4532 |
}
|
4533 |
return 1;
|
4534 |
}
|
4535 |
|
4536 |
/*
|
4537 |
*--------------------------------------------------------------
|
4538 |
*
|
4539 |
* CharDisplayProc --
|
4540 |
*
|
4541 |
* This procedure is called to display a character chunk on
|
4542 |
* the screen or in an off-screen pixmap.
|
4543 |
*
|
4544 |
* Results:
|
4545 |
* None.
|
4546 |
*
|
4547 |
* Side effects:
|
4548 |
* Graphics are drawn.
|
4549 |
*
|
4550 |
*--------------------------------------------------------------
|
4551 |
*/
|
4552 |
|
4553 |
static void
|
4554 |
CharDisplayProc(chunkPtr, x, y, height, baseline, display, dst, screenY)
|
4555 |
TkTextDispChunk *chunkPtr; /* Chunk that is to be drawn. */
|
4556 |
int x; /* X-position in dst at which to
|
4557 |
* draw this chunk (may differ from
|
4558 |
* the x-position in the chunk because
|
4559 |
* of scrolling). */
|
4560 |
int y; /* Y-position at which to draw this
|
4561 |
* chunk in dst. */
|
4562 |
int height; /* Total height of line. */
|
4563 |
int baseline; /* Offset of baseline from y. */
|
4564 |
Display *display; /* Display to use for drawing. */
|
4565 |
Drawable dst; /* Pixmap or window in which to draw
|
4566 |
* chunk. */
|
4567 |
int screenY; /* Y-coordinate in text window that
|
4568 |
* corresponds to y. */
|
4569 |
{
|
4570 |
CharInfo *ciPtr = (CharInfo *) chunkPtr->clientData;
|
4571 |
TextStyle *stylePtr;
|
4572 |
StyleValues *sValuePtr;
|
4573 |
int offsetBytes, offsetX;
|
4574 |
|
4575 |
if ((x + chunkPtr->width) <= 0) {
|
4576 |
/*
|
4577 |
* The chunk is off-screen.
|
4578 |
*/
|
4579 |
|
4580 |
return;
|
4581 |
}
|
4582 |
|
4583 |
stylePtr = chunkPtr->stylePtr;
|
4584 |
sValuePtr = stylePtr->sValuePtr;
|
4585 |
|
4586 |
/*
|
4587 |
* If the text sticks out way to the left of the window, skip
|
4588 |
* over the characters that aren't in the visible part of the
|
4589 |
* window. This is essential if x is very negative (such as
|
4590 |
* less than 32K); otherwise overflow problems will occur
|
4591 |
* in servers that use 16-bit arithmetic, like X.
|
4592 |
*/
|
4593 |
|
4594 |
offsetX = x;
|
4595 |
offsetBytes = 0;
|
4596 |
if (x < 0) {
|
4597 |
offsetBytes = MeasureChars(sValuePtr->tkfont, ciPtr->chars,
|
4598 |
ciPtr->numBytes, x, 0, x - chunkPtr->x, &offsetX);
|
4599 |
}
|
4600 |
|
4601 |
/*
|
4602 |
* Draw the text, underline, and overstrike for this chunk.
|
4603 |
*/
|
4604 |
|
4605 |
if (!sValuePtr->elide && (ciPtr->numBytes > offsetBytes) && (stylePtr->fgGC != None)) {
|
4606 |
int numBytes = ciPtr->numBytes - offsetBytes;
|
4607 |
char *string = ciPtr->chars + offsetBytes;
|
4608 |
|
4609 |
if ((numBytes > 0) && (string[numBytes - 1] == '\t')) {
|
4610 |
numBytes--;
|
4611 |
}
|
4612 |
Tk_DrawChars(display, dst, stylePtr->fgGC, sValuePtr->tkfont, string,
|
4613 |
numBytes, offsetX, y + baseline - sValuePtr->offset);
|
4614 |
if (sValuePtr->underline) {
|
4615 |
Tk_UnderlineChars(display, dst, stylePtr->fgGC, sValuePtr->tkfont,
|
4616 |
ciPtr->chars + offsetBytes, offsetX,
|
4617 |
y + baseline - sValuePtr->offset, 0, numBytes);
|
4618 |
|
4619 |
}
|
4620 |
if (sValuePtr->overstrike) {
|
4621 |
Tk_FontMetrics fm;
|
4622 |
|
4623 |
Tk_GetFontMetrics(sValuePtr->tkfont, &fm);
|
4624 |
Tk_UnderlineChars(display, dst, stylePtr->fgGC, sValuePtr->tkfont,
|
4625 |
ciPtr->chars + offsetBytes, offsetX,
|
4626 |
y + baseline - sValuePtr->offset
|
4627 |
- fm.descent - (fm.ascent * 3) / 10,
|
4628 |
0, numBytes);
|
4629 |
}
|
4630 |
}
|
4631 |
}
|
4632 |
|
4633 |
/*
|
4634 |
*--------------------------------------------------------------
|
4635 |
*
|
4636 |
* CharUndisplayProc --
|
4637 |
*
|
4638 |
* This procedure is called when a character chunk is no
|
4639 |
* longer going to be displayed. It frees up resources
|
4640 |
* that were allocated to display the chunk.
|
4641 |
*
|
4642 |
* Results:
|
4643 |
* None.
|
4644 |
*
|
4645 |
* Side effects:
|
4646 |
* Memory and other resources get freed.
|
4647 |
*
|
4648 |
*--------------------------------------------------------------
|
4649 |
*/
|
4650 |
|
4651 |
static void
|
4652 |
CharUndisplayProc(textPtr, chunkPtr)
|
4653 |
TkText *textPtr; /* Overall information about text
|
4654 |
* widget. */
|
4655 |
TkTextDispChunk *chunkPtr; /* Chunk that is about to be freed. */
|
4656 |
{
|
4657 |
CharInfo *ciPtr = (CharInfo *) chunkPtr->clientData;
|
4658 |
|
4659 |
ckfree((char *) ciPtr);
|
4660 |
}
|
4661 |
|
4662 |
/*
|
4663 |
*--------------------------------------------------------------
|
4664 |
*
|
4665 |
* CharMeasureProc --
|
4666 |
*
|
4667 |
* This procedure is called to determine which character in
|
4668 |
* a character chunk lies over a given x-coordinate.
|
4669 |
*
|
4670 |
* Results:
|
4671 |
* The return value is the index *within the chunk* of the
|
4672 |
* character that covers the position given by "x".
|
4673 |
*
|
4674 |
* Side effects:
|
4675 |
* None.
|
4676 |
*
|
4677 |
*--------------------------------------------------------------
|
4678 |
*/
|
4679 |
|
4680 |
static int
|
4681 |
CharMeasureProc(chunkPtr, x)
|
4682 |
TkTextDispChunk *chunkPtr; /* Chunk containing desired coord. */
|
4683 |
int x; /* X-coordinate, in same coordinate
|
4684 |
* system as chunkPtr->x. */
|
4685 |
{
|
4686 |
CharInfo *ciPtr = (CharInfo *) chunkPtr->clientData;
|
4687 |
int endX;
|
4688 |
|
4689 |
return MeasureChars(chunkPtr->stylePtr->sValuePtr->tkfont, ciPtr->chars,
|
4690 |
chunkPtr->numBytes - 1, chunkPtr->x, x, 0, &endX);
|
4691 |
/* CHAR OFFSET */
|
4692 |
}
|
4693 |
|
4694 |
/*
|
4695 |
*--------------------------------------------------------------
|
4696 |
*
|
4697 |
* CharBboxProc --
|
4698 |
*
|
4699 |
* This procedure is called to compute the bounding box of
|
4700 |
* the area occupied by a single character.
|
4701 |
*
|
4702 |
* Results:
|
4703 |
* There is no return value. *xPtr and *yPtr are filled in
|
4704 |
* with the coordinates of the upper left corner of the
|
4705 |
* character, and *widthPtr and *heightPtr are filled in with
|
4706 |
* the dimensions of the character in pixels. Note: not all
|
4707 |
* of the returned bbox is necessarily visible on the screen
|
4708 |
* (the rightmost part might be off-screen to the right,
|
4709 |
* and the bottommost part might be off-screen to the bottom).
|
4710 |
*
|
4711 |
* Side effects:
|
4712 |
* None.
|
4713 |
*
|
4714 |
*--------------------------------------------------------------
|
4715 |
*/
|
4716 |
|
4717 |
static void
|
4718 |
CharBboxProc(chunkPtr, byteIndex, y, lineHeight, baseline, xPtr, yPtr,
|
4719 |
widthPtr, heightPtr)
|
4720 |
TkTextDispChunk *chunkPtr; /* Chunk containing desired char. */
|
4721 |
int byteIndex; /* Byte offset of desired character
|
4722 |
* within the chunk. */
|
4723 |
int y; /* Topmost pixel in area allocated
|
4724 |
* for this line. */
|
4725 |
int lineHeight; /* Height of line, in pixels. */
|
4726 |
int baseline; /* Location of line's baseline, in
|
4727 |
* pixels measured down from y. */
|
4728 |
int *xPtr, *yPtr; /* Gets filled in with coords of
|
4729 |
* character's upper-left pixel.
|
4730 |
* X-coord is in same coordinate
|
4731 |
* system as chunkPtr->x. */
|
4732 |
int *widthPtr; /* Gets filled in with width of
|
4733 |
* character, in pixels. */
|
4734 |
int *heightPtr; /* Gets filled in with height of
|
4735 |
* character, in pixels. */
|
4736 |
{
|
4737 |
CharInfo *ciPtr = (CharInfo *) chunkPtr->clientData;
|
4738 |
int maxX;
|
4739 |
|
4740 |
maxX = chunkPtr->width + chunkPtr->x;
|
4741 |
MeasureChars(chunkPtr->stylePtr->sValuePtr->tkfont, ciPtr->chars,
|
4742 |
byteIndex, chunkPtr->x, -1, 0, xPtr);
|
4743 |
|
4744 |
if (byteIndex == ciPtr->numBytes) {
|
4745 |
/*
|
4746 |
* This situation only happens if the last character in a line
|
4747 |
* is a space character, in which case it absorbs all of the
|
4748 |
* extra space in the line (see TkTextCharLayoutProc).
|
4749 |
*/
|
4750 |
|
4751 |
*widthPtr = maxX - *xPtr;
|
4752 |
} else if ((ciPtr->chars[byteIndex] == '\t')
|
4753 |
&& (byteIndex == ciPtr->numBytes - 1)) {
|
4754 |
/*
|
4755 |
* The desired character is a tab character that terminates a
|
4756 |
* chunk; give it all the space left in the chunk.
|
4757 |
*/
|
4758 |
|
4759 |
*widthPtr = maxX - *xPtr;
|
4760 |
} else {
|
4761 |
MeasureChars(chunkPtr->stylePtr->sValuePtr->tkfont,
|
4762 |
ciPtr->chars + byteIndex, 1, *xPtr, -1, 0, widthPtr);
|
4763 |
if (*widthPtr > maxX) {
|
4764 |
*widthPtr = maxX - *xPtr;
|
4765 |
} else {
|
4766 |
*widthPtr -= *xPtr;
|
4767 |
}
|
4768 |
}
|
4769 |
*yPtr = y + baseline - chunkPtr->minAscent;
|
4770 |
*heightPtr = chunkPtr->minAscent + chunkPtr->minDescent;
|
4771 |
}
|
4772 |
|
4773 |
/*
|
4774 |
*----------------------------------------------------------------------
|
4775 |
*
|
4776 |
* AdjustForTab --
|
4777 |
*
|
4778 |
* This procedure is called to move a series of chunks right
|
4779 |
* in order to align them with a tab stop.
|
4780 |
*
|
4781 |
* Results:
|
4782 |
* None.
|
4783 |
*
|
4784 |
* Side effects:
|
4785 |
* The width of chunkPtr gets adjusted so that it absorbs the
|
4786 |
* extra space due to the tab. The x locations in all the chunks
|
4787 |
* after chunkPtr are adjusted rightward to align with the tab
|
4788 |
* stop given by tabArrayPtr and index.
|
4789 |
*
|
4790 |
*----------------------------------------------------------------------
|
4791 |
*/
|
4792 |
|
4793 |
static void
|
4794 |
AdjustForTab(textPtr, tabArrayPtr, index, chunkPtr)
|
4795 |
TkText *textPtr; /* Information about the text widget as
|
4796 |
* a whole. */
|
4797 |
TkTextTabArray *tabArrayPtr; /* Information about the tab stops
|
4798 |
* that apply to this line. May be
|
4799 |
* NULL to indicate default tabbing
|
4800 |
* (every 8 chars). */
|
4801 |
int index; /* Index of current tab stop. */
|
4802 |
TkTextDispChunk *chunkPtr; /* Chunk whose last character is
|
4803 |
* the tab; the following chunks
|
4804 |
* contain information to be shifted
|
4805 |
* right. */
|
4806 |
|
4807 |
{
|
4808 |
int x, desired, delta, width, decimal, i, gotDigit;
|
4809 |
TkTextDispChunk *chunkPtr2, *decimalChunkPtr;
|
4810 |
CharInfo *ciPtr;
|
4811 |
int tabX, prev, spaceWidth;
|
4812 |
char *p;
|
4813 |
TkTextTabAlign alignment;
|
4814 |
|
4815 |
if (chunkPtr->nextPtr == NULL) {
|
4816 |
/*
|
4817 |
* Nothing after the actual tab; just return.
|
4818 |
*/
|
4819 |
|
4820 |
return;
|
4821 |
}
|
4822 |
|
4823 |
/*
|
4824 |
* If no tab information has been given, do the usual thing:
|
4825 |
* round up to the next boundary of 8 average-sized characters.
|
4826 |
*/
|
4827 |
|
4828 |
x = chunkPtr->nextPtr->x;
|
4829 |
if ((tabArrayPtr == NULL) || (tabArrayPtr->numTabs == 0)) {
|
4830 |
/*
|
4831 |
* No tab information has been given, so use the default
|
4832 |
* interpretation of tabs.
|
4833 |
*/
|
4834 |
|
4835 |
desired = NextTabStop(textPtr->tkfont, x, 0);
|
4836 |
goto update;
|
4837 |
}
|
4838 |
|
4839 |
if (index < tabArrayPtr->numTabs) {
|
4840 |
alignment = tabArrayPtr->tabs[index].alignment;
|
4841 |
tabX = tabArrayPtr->tabs[index].location;
|
4842 |
} else {
|
4843 |
/*
|
4844 |
* Ran out of tab stops; compute a tab position by extrapolating
|
4845 |
* from the last two tab positions.
|
4846 |
*/
|
4847 |
|
4848 |
if (tabArrayPtr->numTabs > 1) {
|
4849 |
prev = tabArrayPtr->tabs[tabArrayPtr->numTabs-2].location;
|
4850 |
} else {
|
4851 |
prev = 0;
|
4852 |
}
|
4853 |
alignment = tabArrayPtr->tabs[tabArrayPtr->numTabs-1].alignment;
|
4854 |
tabX = tabArrayPtr->tabs[tabArrayPtr->numTabs-1].location
|
4855 |
+ (index + 1 - tabArrayPtr->numTabs)
|
4856 |
* (tabArrayPtr->tabs[tabArrayPtr->numTabs-1].location - prev);
|
4857 |
}
|
4858 |
|
4859 |
if (alignment == LEFT) {
|
4860 |
desired = tabX;
|
4861 |
goto update;
|
4862 |
}
|
4863 |
|
4864 |
if ((alignment == CENTER) || (alignment == RIGHT)) {
|
4865 |
/*
|
4866 |
* Compute the width of all the information in the tab group,
|
4867 |
* then use it to pick a desired location.
|
4868 |
*/
|
4869 |
|
4870 |
width = 0;
|
4871 |
for (chunkPtr2 = chunkPtr->nextPtr; chunkPtr2 != NULL;
|
4872 |
chunkPtr2 = chunkPtr2->nextPtr) {
|
4873 |
width += chunkPtr2->width;
|
4874 |
}
|
4875 |
if (alignment == CENTER) {
|
4876 |
desired = tabX - width/2;
|
4877 |
} else {
|
4878 |
desired = tabX - width;
|
4879 |
}
|
4880 |
goto update;
|
4881 |
}
|
4882 |
|
4883 |
/*
|
4884 |
* Must be numeric alignment. Search through the text to be
|
4885 |
* tabbed, looking for the last , or . before the first character
|
4886 |
* that isn't a number, comma, period, or sign.
|
4887 |
*/
|
4888 |
|
4889 |
decimalChunkPtr = NULL;
|
4890 |
decimal = gotDigit = 0;
|
4891 |
for (chunkPtr2 = chunkPtr->nextPtr; chunkPtr2 != NULL;
|
4892 |
chunkPtr2 = chunkPtr2->nextPtr) {
|
4893 |
if (chunkPtr2->displayProc != CharDisplayProc) {
|
4894 |
continue;
|
4895 |
}
|
4896 |
ciPtr = (CharInfo *) chunkPtr2->clientData;
|
4897 |
for (p = ciPtr->chars, i = 0; i < ciPtr->numBytes; p++, i++) {
|
4898 |
if (isdigit(UCHAR(*p))) {
|
4899 |
gotDigit = 1;
|
4900 |
} else if ((*p == '.') || (*p == ',')) {
|
4901 |
decimal = p-ciPtr->chars;
|
4902 |
decimalChunkPtr = chunkPtr2;
|
4903 |
} else if (gotDigit) {
|
4904 |
if (decimalChunkPtr == NULL) {
|
4905 |
decimal = p-ciPtr->chars;
|
4906 |
decimalChunkPtr = chunkPtr2;
|
4907 |
}
|
4908 |
goto endOfNumber;
|
4909 |
}
|
4910 |
}
|
4911 |
}
|
4912 |
endOfNumber:
|
4913 |
if (decimalChunkPtr != NULL) {
|
4914 |
int curX;
|
4915 |
|
4916 |
ciPtr = (CharInfo *) decimalChunkPtr->clientData;
|
4917 |
MeasureChars(decimalChunkPtr->stylePtr->sValuePtr->tkfont,
|
4918 |
ciPtr->chars, decimal, decimalChunkPtr->x, -1, 0, &curX);
|
4919 |
desired = tabX - (curX - x);
|
4920 |
goto update;
|
4921 |
} else {
|
4922 |
/*
|
4923 |
* There wasn't a decimal point. Right justify the text.
|
4924 |
*/
|
4925 |
|
4926 |
width = 0;
|
4927 |
for (chunkPtr2 = chunkPtr->nextPtr; chunkPtr2 != NULL;
|
4928 |
chunkPtr2 = chunkPtr2->nextPtr) {
|
4929 |
width += chunkPtr2->width;
|
4930 |
}
|
4931 |
desired = tabX - width;
|
4932 |
}
|
4933 |
|
4934 |
/*
|
4935 |
* Shift all of the chunks to the right so that the left edge is
|
4936 |
* at the desired location, then expand the chunk containing the
|
4937 |
* tab. Be sure that the tab occupies at least the width of a
|
4938 |
* space character.
|
4939 |
*/
|
4940 |
|
4941 |
update:
|
4942 |
delta = desired - x;
|
4943 |
MeasureChars(textPtr->tkfont, " ", 1, 0, -1, 0, &spaceWidth);
|
4944 |
if (delta < spaceWidth) {
|
4945 |
delta = spaceWidth;
|
4946 |
}
|
4947 |
for (chunkPtr2 = chunkPtr->nextPtr; chunkPtr2 != NULL;
|
4948 |
chunkPtr2 = chunkPtr2->nextPtr) {
|
4949 |
chunkPtr2->x += delta;
|
4950 |
}
|
4951 |
chunkPtr->width += delta;
|
4952 |
}
|
4953 |
|
4954 |
/*
|
4955 |
*----------------------------------------------------------------------
|
4956 |
*
|
4957 |
* SizeOfTab --
|
4958 |
*
|
4959 |
* This returns an estimate of the amount of white space that will
|
4960 |
* be consumed by a tab.
|
4961 |
*
|
4962 |
* Results:
|
4963 |
* The return value is the minimum number of pixels that will
|
4964 |
* be occupied by the index'th tab of tabArrayPtr, assuming that
|
4965 |
* the current position on the line is x and the end of the
|
4966 |
* line is maxX. For numeric tabs, this is a conservative
|
4967 |
* estimate. The return value is always >= 0.
|
4968 |
*
|
4969 |
* Side effects:
|
4970 |
* None.
|
4971 |
*
|
4972 |
*----------------------------------------------------------------------
|
4973 |
*/
|
4974 |
|
4975 |
static int
|
4976 |
SizeOfTab(textPtr, tabArrayPtr, index, x, maxX)
|
4977 |
TkText *textPtr; /* Information about the text widget as
|
4978 |
* a whole. */
|
4979 |
TkTextTabArray *tabArrayPtr; /* Information about the tab stops
|
4980 |
* that apply to this line. NULL
|
4981 |
* means use default tabbing (every
|
4982 |
* 8 chars.) */
|
4983 |
int index; /* Index of current tab stop. */
|
4984 |
int x; /* Current x-location in line. Only
|
4985 |
* used if tabArrayPtr == NULL. */
|
4986 |
int maxX; /* X-location of pixel just past the
|
4987 |
* right edge of the line. */
|
4988 |
{
|
4989 |
int tabX, prev, result, spaceWidth;
|
4990 |
TkTextTabAlign alignment;
|
4991 |
|
4992 |
if ((tabArrayPtr == NULL) || (tabArrayPtr->numTabs == 0)) {
|
4993 |
tabX = NextTabStop(textPtr->tkfont, x, 0);
|
4994 |
return tabX - x;
|
4995 |
}
|
4996 |
if (index < tabArrayPtr->numTabs) {
|
4997 |
tabX = tabArrayPtr->tabs[index].location;
|
4998 |
alignment = tabArrayPtr->tabs[index].alignment;
|
4999 |
} else {
|
5000 |
/*
|
5001 |
* Ran out of tab stops; compute a tab position by extrapolating
|
5002 |
* from the last two tab positions.
|
5003 |
*/
|
5004 |
|
5005 |
if (tabArrayPtr->numTabs > 1) {
|
5006 |
prev = tabArrayPtr->tabs[tabArrayPtr->numTabs-2].location;
|
5007 |
} else {
|
5008 |
prev = 0;
|
5009 |
}
|
5010 |
tabX = tabArrayPtr->tabs[tabArrayPtr->numTabs-1].location
|
5011 |
+ (index + 1 - tabArrayPtr->numTabs)
|
5012 |
* (tabArrayPtr->tabs[tabArrayPtr->numTabs-1].location - prev);
|
5013 |
alignment = tabArrayPtr->tabs[tabArrayPtr->numTabs-1].alignment;
|
5014 |
}
|
5015 |
if (alignment == CENTER) {
|
5016 |
/*
|
5017 |
* Be very careful in the arithmetic below, because maxX may
|
5018 |
* be the largest positive number: watch out for integer
|
5019 |
* overflow.
|
5020 |
*/
|
5021 |
|
5022 |
if ((maxX-tabX) < (tabX - x)) {
|
5023 |
result = (maxX - x) - 2*(maxX - tabX);
|
5024 |
} else {
|
5025 |
result = 0;
|
5026 |
}
|
5027 |
goto done;
|
5028 |
}
|
5029 |
if (alignment == RIGHT) {
|
5030 |
result = 0;
|
5031 |
goto done;
|
5032 |
}
|
5033 |
|
5034 |
/*
|
5035 |
* Note: this treats NUMERIC alignment the same as LEFT
|
5036 |
* alignment, which is somewhat conservative. However, it's
|
5037 |
* pretty tricky at this point to figure out exactly where
|
5038 |
* the damn decimal point will be.
|
5039 |
*/
|
5040 |
|
5041 |
if (tabX > x) {
|
5042 |
result = tabX - x;
|
5043 |
} else {
|
5044 |
result = 0;
|
5045 |
}
|
5046 |
|
5047 |
done:
|
5048 |
MeasureChars(textPtr->tkfont, " ", 1, 0, -1, 0, &spaceWidth);
|
5049 |
if (result < spaceWidth) {
|
5050 |
result = spaceWidth;
|
5051 |
}
|
5052 |
return result;
|
5053 |
}
|
5054 |
|
5055 |
/*
|
5056 |
*---------------------------------------------------------------------------
|
5057 |
*
|
5058 |
* NextTabStop --
|
5059 |
*
|
5060 |
* Given the current position, determine where the next default
|
5061 |
* tab stop would be located. This procedure is called when the
|
5062 |
* current chunk in the text has no tabs defined and so the default
|
5063 |
* tab spacing for the font should be used.
|
5064 |
*
|
5065 |
* Results:
|
5066 |
* The location in pixels of the next tab stop.
|
5067 |
*
|
5068 |
* Side effects:
|
5069 |
* None.
|
5070 |
*
|
5071 |
*---------------------------------------------------------------------------
|
5072 |
*/
|
5073 |
|
5074 |
static int
|
5075 |
NextTabStop(tkfont, x, tabOrigin)
|
5076 |
Tk_Font tkfont; /* Font in which chunk that contains tab
|
5077 |
* stop will be drawn. */
|
5078 |
int x; /* X-position in pixels where last
|
5079 |
* character was drawn. The next tab stop
|
5080 |
* occurs somewhere after this location. */
|
5081 |
int tabOrigin; /* The origin for tab stops. May be
|
5082 |
* non-zero if text has been scrolled. */
|
5083 |
{
|
5084 |
int tabWidth, rem;
|
5085 |
|
5086 |
tabWidth = Tk_TextWidth(tkfont, "0", 1) * 8;
|
5087 |
if (tabWidth == 0) {
|
5088 |
tabWidth = 1;
|
5089 |
}
|
5090 |
|
5091 |
x += tabWidth;
|
5092 |
rem = (x - tabOrigin) % tabWidth;
|
5093 |
if (rem < 0) {
|
5094 |
rem += tabWidth;
|
5095 |
}
|
5096 |
x -= rem;
|
5097 |
return x;
|
5098 |
}
|
5099 |
|
5100 |
/*
|
5101 |
*---------------------------------------------------------------------------
|
5102 |
*
|
5103 |
* MeasureChars --
|
5104 |
*
|
5105 |
* Determine the number of characters from the string that will fit
|
5106 |
* in the given horizontal span. The measurement is done under the
|
5107 |
* assumption that Tk_DrawTextLayout will be used to actually display
|
5108 |
* the characters.
|
5109 |
*
|
5110 |
* If tabs are encountered in the string, they will be expanded
|
5111 |
* to the next tab stop, unless the TK_IGNORE_TABS flag is specified.
|
5112 |
*
|
5113 |
* If a newline is encountered in the string, the line will be
|
5114 |
* broken at that point, unless the TK_NEWSLINES_NOT_SPECIAL flag
|
5115 |
* is specified.
|
5116 |
*
|
5117 |
* Results:
|
5118 |
* The return value is the number of bytes from source
|
5119 |
* that fit in the span given by startX and maxX. *nextXPtr
|
5120 |
* is filled in with the x-coordinate at which the first
|
5121 |
* character that didn't fit would be drawn, if it were to
|
5122 |
* be drawn.
|
5123 |
*
|
5124 |
* Side effects:
|
5125 |
* None.
|
5126 |
*
|
5127 |
*--------------------------------------------------------------
|
5128 |
*/
|
5129 |
|
5130 |
static int
|
5131 |
MeasureChars(tkfont, source, maxBytes, startX, maxX, tabOrigin, nextXPtr)
|
5132 |
Tk_Font tkfont; /* Font in which to draw characters. */
|
5133 |
CONST char *source; /* Characters to be displayed. Need not
|
5134 |
* be NULL-terminated. */
|
5135 |
int maxBytes; /* Maximum # of bytes to consider from
|
5136 |
* source. */
|
5137 |
int startX; /* X-position at which first character will
|
5138 |
* be drawn. */
|
5139 |
int maxX; /* Don't consider any character that would
|
5140 |
* cross this x-position. */
|
5141 |
int tabOrigin; /* X-location that serves as "origin" for
|
5142 |
* tab stops. */
|
5143 |
int *nextXPtr; /* Return x-position of terminating
|
5144 |
* character here. */
|
5145 |
{
|
5146 |
int curX, width, ch;
|
5147 |
CONST char *special, *end, *start;
|
5148 |
|
5149 |
ch = 0; /* lint. */
|
5150 |
curX = startX;
|
5151 |
special = source;
|
5152 |
end = source + maxBytes;
|
5153 |
for (start = source; start < end; ) {
|
5154 |
if (start >= special) {
|
5155 |
/*
|
5156 |
* Find the next special character in the string.
|
5157 |
*/
|
5158 |
|
5159 |
for (special = start; special < end; special++) {
|
5160 |
ch = *special;
|
5161 |
if ((ch == '\t') || (ch == '\n')) {
|
5162 |
break;
|
5163 |
}
|
5164 |
}
|
5165 |
}
|
5166 |
|
5167 |
/*
|
5168 |
* Special points at the next special character (or the end of the
|
5169 |
* string). Process characters between start and special.
|
5170 |
*/
|
5171 |
|
5172 |
if ((maxX >= 0) && (curX >= maxX)) {
|
5173 |
break;
|
5174 |
}
|
5175 |
start += Tk_MeasureChars(tkfont, start, special - start, maxX - curX,
|
5176 |
0, &width);
|
5177 |
curX += width;
|
5178 |
if (start < special) {
|
5179 |
/*
|
5180 |
* No more chars fit in line.
|
5181 |
*/
|
5182 |
|
5183 |
break;
|
5184 |
}
|
5185 |
if (special < end) {
|
5186 |
if (ch == '\t') {
|
5187 |
start++;
|
5188 |
} else {
|
5189 |
break;
|
5190 |
}
|
5191 |
}
|
5192 |
}
|
5193 |
|
5194 |
*nextXPtr = curX;
|
5195 |
return start - source;
|
5196 |
}
|
5197 |
|
5198 |
/* End of tktextdisp.c */
|