5015 lines
149 KiB
C
5015 lines
149 KiB
C
/*
|
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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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* SCCS: @(#) tkTextDisp.c 1.124 97/07/11 18:01:03
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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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/*
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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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Tk_Uid wrapMode; /* How to handle wrap-around for this tag.
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* One of tkTextCharUid, tkTextNoneUid,
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* or tkTextWordUid. */
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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 count; /* Number of characters 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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*/
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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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/*
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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 newCharOffset; /* 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 scanMarkChar; /* Character that was at the left edge of
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* the window when the scan 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
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* 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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/*
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* In TkTextDispChunk structures for character segments, the clientData
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* field points to one of the following structures:
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*/
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typedef struct CharInfo {
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int numChars; /* Number of characters to display. */
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char chars[4]; /* Characters to display. Actual size
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* will be numChars, not 4. THIS MUST BE
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* THE LAST FIELD IN THE STRUCTURE. */
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} CharInfo;
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/*
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* Flag values for TextDInfo structures:
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*
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* DINFO_OUT_OF_DATE: Non-zero means that the DLine structures
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* for this window are partially or completely
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* out of date and need to be recomputed.
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* REDRAW_PENDING: Means that a when-idle handler has been
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* scheduled to update the display.
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* REDRAW_BORDERS: Means window border or pad area has
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* potentially been damaged and must be redrawn.
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* REPICK_NEEDED: 1 means that the widget has been modified
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* in a way that could change the current
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* character (a different character might be
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* under the mouse cursor now). Need to
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* recompute the current character before
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* the next redisplay.
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*/
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#define DINFO_OUT_OF_DATE 1
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#define REDRAW_PENDING 2
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#define REDRAW_BORDERS 4
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#define REPICK_NEEDED 8
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/*
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* The following counters keep statistics about redisplay that can be
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* checked to see how clever this code is at reducing redisplays.
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*/
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static int numRedisplays; /* Number of calls to DisplayText. */
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static int linesRedrawn; /* Number of calls to DisplayDLine. */
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static int numCopies; /* Number of calls to XCopyArea to copy part
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* of the screen. */
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/*
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* Forward declarations for procedures defined later in this file:
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*/
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static void AdjustForTab _ANSI_ARGS_((TkText *textPtr,
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TkTextTabArray *tabArrayPtr, int index,
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TkTextDispChunk *chunkPtr));
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static void CharBboxProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr,
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int index, int y, int lineHeight, int baseline,
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int *xPtr, int *yPtr, int *widthPtr,
|
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int *heightPtr));
|
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static void CharDisplayProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr,
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int x, int y, int height, int baseline,
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Display *display, Drawable dst, int screenY));
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static int CharMeasureProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr,
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int x));
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static void CharUndisplayProc _ANSI_ARGS_((TkText *textPtr,
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TkTextDispChunk *chunkPtr));
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static void DisplayDLine _ANSI_ARGS_((TkText *textPtr,
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DLine *dlPtr, DLine *prevPtr, Pixmap pixmap));
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static void DisplayLineBackground _ANSI_ARGS_((TkText *textPtr,
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DLine *dlPtr, DLine *prevPtr, Pixmap pixmap));
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static void DisplayText _ANSI_ARGS_((ClientData clientData));
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static DLine * FindDLine _ANSI_ARGS_((DLine *dlPtr,
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TkTextIndex *indexPtr));
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static void FreeDLines _ANSI_ARGS_((TkText *textPtr,
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DLine *firstPtr, DLine *lastPtr, int unlink));
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static void FreeStyle _ANSI_ARGS_((TkText *textPtr,
|
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TextStyle *stylePtr));
|
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static TextStyle * GetStyle _ANSI_ARGS_((TkText *textPtr,
|
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TkTextIndex *indexPtr));
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static void GetXView _ANSI_ARGS_((Tcl_Interp *interp,
|
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TkText *textPtr, int report));
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static void GetYView _ANSI_ARGS_((Tcl_Interp *interp,
|
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TkText *textPtr, int report));
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static DLine * LayoutDLine _ANSI_ARGS_((TkText *textPtr,
|
||
TkTextIndex *indexPtr));
|
||
static int MeasureChars _ANSI_ARGS_((Tk_Font tkfont,
|
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CONST char *source, int maxChars, int startX,
|
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int maxX, int tabOrigin, int *nextXPtr));
|
||
static void MeasureUp _ANSI_ARGS_((TkText *textPtr,
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TkTextIndex *srcPtr, int distance,
|
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TkTextIndex *dstPtr));
|
||
static int NextTabStop _ANSI_ARGS_((Tk_Font tkfont, int x,
|
||
int tabOrigin));
|
||
static void UpdateDisplayInfo _ANSI_ARGS_((TkText *textPtr));
|
||
static void ScrollByLines _ANSI_ARGS_((TkText *textPtr,
|
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int offset));
|
||
static int SizeOfTab _ANSI_ARGS_((TkText *textPtr,
|
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TkTextTabArray *tabArrayPtr, int index, int x,
|
||
int maxX));
|
||
static void TextInvalidateRegion _ANSI_ARGS_((TkText *textPtr,
|
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TkRegion region));
|
||
|
||
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/*
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*----------------------------------------------------------------------
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*
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* TkTextCreateDInfo --
|
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*
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* This procedure is called when a new text widget is created.
|
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* Its job is to set up display-related information for the widget.
|
||
*
|
||
* Results:
|
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* None.
|
||
*
|
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* Side effects:
|
||
* A TextDInfo data structure is allocated and initialized and attached
|
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* to textPtr.
|
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*
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*----------------------------------------------------------------------
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*/
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||
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void
|
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TkTextCreateDInfo(textPtr)
|
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TkText *textPtr; /* Overall information for text widget. */
|
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{
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register TextDInfo *dInfoPtr;
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XGCValues gcValues;
|
||
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dInfoPtr = (TextDInfo *) ckalloc(sizeof(TextDInfo));
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Tcl_InitHashTable(&dInfoPtr->styleTable, sizeof(StyleValues)/sizeof(int));
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dInfoPtr->dLinePtr = NULL;
|
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dInfoPtr->copyGC = None;
|
||
gcValues.graphics_exposures = True;
|
||
dInfoPtr->scrollGC = Tk_GetGC(textPtr->tkwin, GCGraphicsExposures,
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&gcValues);
|
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dInfoPtr->topOfEof = 0;
|
||
dInfoPtr->newCharOffset = 0;
|
||
dInfoPtr->curPixelOffset = 0;
|
||
dInfoPtr->maxLength = 0;
|
||
dInfoPtr->xScrollFirst = -1;
|
||
dInfoPtr->xScrollLast = -1;
|
||
dInfoPtr->yScrollFirst = -1;
|
||
dInfoPtr->yScrollLast = -1;
|
||
dInfoPtr->scanMarkChar = 0;
|
||
dInfoPtr->scanMarkX = 0;
|
||
dInfoPtr->scanTotalScroll = 0;
|
||
dInfoPtr->scanMarkY = 0;
|
||
dInfoPtr->dLinesInvalidated = 0;
|
||
dInfoPtr->flags = DINFO_OUT_OF_DATE;
|
||
textPtr->dInfoPtr = dInfoPtr;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* TkTextFreeDInfo --
|
||
*
|
||
* This procedure is called to free up all of the private display
|
||
* information kept by this file for a text widget.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Lots of resources get freed.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
void
|
||
TkTextFreeDInfo(textPtr)
|
||
TkText *textPtr; /* Overall information for text widget. */
|
||
{
|
||
register TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
|
||
/*
|
||
* Be careful to free up styleTable *after* freeing up all the
|
||
* DLines, so that the hash table is still intact to free up the
|
||
* style-related information from the lines. Once the lines are
|
||
* all free then styleTable will be empty.
|
||
*/
|
||
|
||
FreeDLines(textPtr, dInfoPtr->dLinePtr, (DLine *) NULL, 1);
|
||
Tcl_DeleteHashTable(&dInfoPtr->styleTable);
|
||
if (dInfoPtr->copyGC != None) {
|
||
Tk_FreeGC(textPtr->display, dInfoPtr->copyGC);
|
||
}
|
||
Tk_FreeGC(textPtr->display, dInfoPtr->scrollGC);
|
||
if (dInfoPtr->flags & REDRAW_PENDING) {
|
||
Tcl_CancelIdleCall(DisplayText, (ClientData) textPtr);
|
||
}
|
||
ckfree((char *) dInfoPtr);
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* GetStyle --
|
||
*
|
||
* This procedure creates all the information needed to display
|
||
* text at a particular location.
|
||
*
|
||
* Results:
|
||
* The return value is a pointer to a TextStyle structure that
|
||
* corresponds to *sValuePtr.
|
||
*
|
||
* Side effects:
|
||
* A new entry may be created in the style table for the widget.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static TextStyle *
|
||
GetStyle(textPtr, indexPtr)
|
||
TkText *textPtr; /* Overall information about text widget. */
|
||
TkTextIndex *indexPtr; /* The character in the text for which
|
||
* display information is wanted. */
|
||
{
|
||
TkTextTag **tagPtrs;
|
||
register TkTextTag *tagPtr;
|
||
StyleValues styleValues;
|
||
TextStyle *stylePtr;
|
||
Tcl_HashEntry *hPtr;
|
||
int numTags, new, i;
|
||
XGCValues gcValues;
|
||
unsigned long mask;
|
||
|
||
/*
|
||
* The variables below keep track of the highest-priority specification
|
||
* that has occurred for each of the various fields of the StyleValues.
|
||
*/
|
||
|
||
int borderPrio, borderWidthPrio, reliefPrio, bgStipplePrio;
|
||
int fgPrio, fontPrio, fgStipplePrio;
|
||
int underlinePrio, justifyPrio, offsetPrio;
|
||
int lMargin1Prio, lMargin2Prio, rMarginPrio;
|
||
int spacing1Prio, spacing2Prio, spacing3Prio;
|
||
int overstrikePrio, tabPrio, wrapPrio;
|
||
|
||
/*
|
||
* Find out what tags are present for the character, then compute
|
||
* a StyleValues structure corresponding to those tags (scan
|
||
* through all of the tags, saving information for the highest-
|
||
* priority tag).
|
||
*/
|
||
|
||
tagPtrs = TkBTreeGetTags(indexPtr, &numTags);
|
||
borderPrio = borderWidthPrio = reliefPrio = bgStipplePrio = -1;
|
||
fgPrio = fontPrio = fgStipplePrio = -1;
|
||
underlinePrio = justifyPrio = offsetPrio = -1;
|
||
lMargin1Prio = lMargin2Prio = rMarginPrio = -1;
|
||
spacing1Prio = spacing2Prio = spacing3Prio = -1;
|
||
overstrikePrio = tabPrio = wrapPrio = -1;
|
||
memset((VOID *) &styleValues, 0, sizeof(StyleValues));
|
||
styleValues.relief = TK_RELIEF_FLAT;
|
||
styleValues.fgColor = textPtr->fgColor;
|
||
styleValues.tkfont = textPtr->tkfont;
|
||
styleValues.justify = TK_JUSTIFY_LEFT;
|
||
styleValues.spacing1 = textPtr->spacing1;
|
||
styleValues.spacing2 = textPtr->spacing2;
|
||
styleValues.spacing3 = textPtr->spacing3;
|
||
styleValues.tabArrayPtr = textPtr->tabArrayPtr;
|
||
styleValues.wrapMode = textPtr->wrapMode;
|
||
for (i = 0 ; i < numTags; i++) {
|
||
tagPtr = tagPtrs[i];
|
||
|
||
/*
|
||
* On Windows and Mac, we need to skip the selection tag if
|
||
* we don't have focus.
|
||
*/
|
||
|
||
#ifndef ALWAYS_SHOW_SELECTION
|
||
if ((tagPtr == textPtr->selTagPtr) && !(textPtr->flags & GOT_FOCUS)) {
|
||
continue;
|
||
}
|
||
#endif
|
||
|
||
if ((tagPtr->border != NULL) && (tagPtr->priority > borderPrio)) {
|
||
styleValues.border = tagPtr->border;
|
||
borderPrio = tagPtr->priority;
|
||
}
|
||
if ((tagPtr->bdString != NULL)
|
||
&& (tagPtr->priority > borderWidthPrio)) {
|
||
styleValues.borderWidth = tagPtr->borderWidth;
|
||
borderWidthPrio = tagPtr->priority;
|
||
}
|
||
if ((tagPtr->reliefString != NULL)
|
||
&& (tagPtr->priority > reliefPrio)) {
|
||
if (styleValues.border == NULL) {
|
||
styleValues.border = textPtr->border;
|
||
}
|
||
styleValues.relief = tagPtr->relief;
|
||
reliefPrio = tagPtr->priority;
|
||
}
|
||
if ((tagPtr->bgStipple != None)
|
||
&& (tagPtr->priority > bgStipplePrio)) {
|
||
styleValues.bgStipple = tagPtr->bgStipple;
|
||
bgStipplePrio = tagPtr->priority;
|
||
}
|
||
if ((tagPtr->fgColor != None) && (tagPtr->priority > fgPrio)) {
|
||
styleValues.fgColor = tagPtr->fgColor;
|
||
fgPrio = tagPtr->priority;
|
||
}
|
||
if ((tagPtr->tkfont != None) && (tagPtr->priority > fontPrio)) {
|
||
styleValues.tkfont = tagPtr->tkfont;
|
||
fontPrio = tagPtr->priority;
|
||
}
|
||
if ((tagPtr->fgStipple != None)
|
||
&& (tagPtr->priority > fgStipplePrio)) {
|
||
styleValues.fgStipple = tagPtr->fgStipple;
|
||
fgStipplePrio = tagPtr->priority;
|
||
}
|
||
if ((tagPtr->justifyString != NULL)
|
||
&& (tagPtr->priority > justifyPrio)) {
|
||
styleValues.justify = tagPtr->justify;
|
||
justifyPrio = tagPtr->priority;
|
||
}
|
||
if ((tagPtr->lMargin1String != NULL)
|
||
&& (tagPtr->priority > lMargin1Prio)) {
|
||
styleValues.lMargin1 = tagPtr->lMargin1;
|
||
lMargin1Prio = tagPtr->priority;
|
||
}
|
||
if ((tagPtr->lMargin2String != NULL)
|
||
&& (tagPtr->priority > lMargin2Prio)) {
|
||
styleValues.lMargin2 = tagPtr->lMargin2;
|
||
lMargin2Prio = tagPtr->priority;
|
||
}
|
||
if ((tagPtr->offsetString != NULL)
|
||
&& (tagPtr->priority > offsetPrio)) {
|
||
styleValues.offset = tagPtr->offset;
|
||
offsetPrio = tagPtr->priority;
|
||
}
|
||
if ((tagPtr->overstrikeString != NULL)
|
||
&& (tagPtr->priority > overstrikePrio)) {
|
||
styleValues.overstrike = tagPtr->overstrike;
|
||
overstrikePrio = tagPtr->priority;
|
||
}
|
||
if ((tagPtr->rMarginString != NULL)
|
||
&& (tagPtr->priority > rMarginPrio)) {
|
||
styleValues.rMargin = tagPtr->rMargin;
|
||
rMarginPrio = tagPtr->priority;
|
||
}
|
||
if ((tagPtr->spacing1String != NULL)
|
||
&& (tagPtr->priority > spacing1Prio)) {
|
||
styleValues.spacing1 = tagPtr->spacing1;
|
||
spacing1Prio = tagPtr->priority;
|
||
}
|
||
if ((tagPtr->spacing2String != NULL)
|
||
&& (tagPtr->priority > spacing2Prio)) {
|
||
styleValues.spacing2 = tagPtr->spacing2;
|
||
spacing2Prio = tagPtr->priority;
|
||
}
|
||
if ((tagPtr->spacing3String != NULL)
|
||
&& (tagPtr->priority > spacing3Prio)) {
|
||
styleValues.spacing3 = tagPtr->spacing3;
|
||
spacing3Prio = tagPtr->priority;
|
||
}
|
||
if ((tagPtr->tabString != NULL)
|
||
&& (tagPtr->priority > tabPrio)) {
|
||
styleValues.tabArrayPtr = tagPtr->tabArrayPtr;
|
||
tabPrio = tagPtr->priority;
|
||
}
|
||
if ((tagPtr->underlineString != NULL)
|
||
&& (tagPtr->priority > underlinePrio)) {
|
||
styleValues.underline = tagPtr->underline;
|
||
underlinePrio = tagPtr->priority;
|
||
}
|
||
if ((tagPtr->wrapMode != NULL)
|
||
&& (tagPtr->priority > wrapPrio)) {
|
||
styleValues.wrapMode = tagPtr->wrapMode;
|
||
wrapPrio = tagPtr->priority;
|
||
}
|
||
}
|
||
if (tagPtrs != NULL) {
|
||
ckfree((char *) tagPtrs);
|
||
}
|
||
|
||
/*
|
||
* Use an existing style if there's one around that matches.
|
||
*/
|
||
|
||
hPtr = Tcl_CreateHashEntry(&textPtr->dInfoPtr->styleTable,
|
||
(char *) &styleValues, &new);
|
||
if (!new) {
|
||
stylePtr = (TextStyle *) Tcl_GetHashValue(hPtr);
|
||
stylePtr->refCount++;
|
||
return stylePtr;
|
||
}
|
||
|
||
/*
|
||
* No existing style matched. Make a new one.
|
||
*/
|
||
|
||
stylePtr = (TextStyle *) ckalloc(sizeof(TextStyle));
|
||
stylePtr->refCount = 1;
|
||
if (styleValues.border != NULL) {
|
||
gcValues.foreground = Tk_3DBorderColor(styleValues.border)->pixel;
|
||
mask = GCForeground;
|
||
if (styleValues.bgStipple != None) {
|
||
gcValues.stipple = styleValues.bgStipple;
|
||
gcValues.fill_style = FillStippled;
|
||
mask |= GCStipple|GCFillStyle;
|
||
}
|
||
stylePtr->bgGC = Tk_GetGC(textPtr->tkwin, mask, &gcValues);
|
||
} else {
|
||
stylePtr->bgGC = None;
|
||
}
|
||
mask = GCForeground|GCFont;
|
||
gcValues.foreground = styleValues.fgColor->pixel;
|
||
gcValues.font = Tk_FontId(styleValues.tkfont);
|
||
if (styleValues.fgStipple != None) {
|
||
gcValues.stipple = styleValues.fgStipple;
|
||
gcValues.fill_style = FillStippled;
|
||
mask |= GCStipple|GCFillStyle;
|
||
}
|
||
stylePtr->fgGC = Tk_GetGC(textPtr->tkwin, mask, &gcValues);
|
||
stylePtr->sValuePtr = (StyleValues *)
|
||
Tcl_GetHashKey(&textPtr->dInfoPtr->styleTable, hPtr);
|
||
stylePtr->hPtr = hPtr;
|
||
Tcl_SetHashValue(hPtr, stylePtr);
|
||
return stylePtr;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* FreeStyle --
|
||
*
|
||
* This procedure is called when a TextStyle structure is no longer
|
||
* needed. It decrements the reference count and frees up the
|
||
* space for the style structure if the reference count is 0.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The storage and other resources associated with the style
|
||
* are freed up if no-one's still using it.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
FreeStyle(textPtr, stylePtr)
|
||
TkText *textPtr; /* Information about overall widget. */
|
||
register TextStyle *stylePtr; /* Information about style to free. */
|
||
|
||
{
|
||
stylePtr->refCount--;
|
||
if (stylePtr->refCount == 0) {
|
||
if (stylePtr->bgGC != None) {
|
||
Tk_FreeGC(textPtr->display, stylePtr->bgGC);
|
||
}
|
||
Tk_FreeGC(textPtr->display, stylePtr->fgGC);
|
||
Tcl_DeleteHashEntry(stylePtr->hPtr);
|
||
ckfree((char *) stylePtr);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* LayoutDLine --
|
||
*
|
||
* This procedure generates a single DLine structure for a display
|
||
* line whose leftmost character is given by indexPtr.
|
||
*
|
||
* Results:
|
||
* The return value is a pointer to a DLine structure desribing the
|
||
* display line. All fields are filled in and correct except for
|
||
* y and nextPtr.
|
||
*
|
||
* Side effects:
|
||
* Storage is allocated for the new DLine.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static DLine *
|
||
LayoutDLine(textPtr, indexPtr)
|
||
TkText *textPtr; /* Overall information about text widget. */
|
||
TkTextIndex *indexPtr; /* Beginning of display line. May not
|
||
* necessarily point to a character segment. */
|
||
{
|
||
register DLine *dlPtr; /* New display line. */
|
||
TkTextSegment *segPtr; /* Current segment in text. */
|
||
TkTextDispChunk *lastChunkPtr; /* Last chunk allocated so far
|
||
* for line. */
|
||
TkTextDispChunk *chunkPtr; /* Current chunk. */
|
||
TkTextIndex curIndex;
|
||
TkTextDispChunk *breakChunkPtr; /* Chunk containing best word break
|
||
* point, if any. */
|
||
TkTextIndex breakIndex; /* Index of first character in
|
||
* breakChunkPtr. */
|
||
int breakCharOffset; /* Character within breakChunkPtr just
|
||
* to right of best break point. */
|
||
int noCharsYet; /* Non-zero means that no characters
|
||
* have been placed on the line yet. */
|
||
int justify; /* How to justify line: taken from
|
||
* style for first character in line. */
|
||
int jIndent; /* Additional indentation (beyond
|
||
* margins) due to justification. */
|
||
int rMargin; /* Right margin width for line. */
|
||
Tk_Uid wrapMode; /* Wrap mode to use for this line. */
|
||
int x = 0, maxX = 0; /* Initializations needed only to
|
||
* stop compiler warnings. */
|
||
int wholeLine; /* Non-zero means this display line
|
||
* runs to the end of the text line. */
|
||
int tabIndex; /* Index of the current tab stop. */
|
||
int gotTab; /* Non-zero means the current chunk
|
||
* contains a tab. */
|
||
TkTextDispChunk *tabChunkPtr; /* Pointer to the chunk containing
|
||
* the previous tab stop. */
|
||
int maxChars; /* Maximum number of characters to
|
||
* include in this chunk. */
|
||
TkTextTabArray *tabArrayPtr; /* Tab stops for line; taken from
|
||
* style for first character on line. */
|
||
int tabSize; /* Number of pixels consumed by current
|
||
* tab stop. */
|
||
TkTextDispChunk *lastCharChunkPtr; /* Pointer to last chunk in display
|
||
* lines with numChars > 0. Used to
|
||
* drop 0-sized chunks from the end
|
||
* of the line. */
|
||
int offset, ascent, descent, code;
|
||
StyleValues *sValuePtr;
|
||
|
||
/*
|
||
* Create and initialize a new DLine structure.
|
||
*/
|
||
|
||
dlPtr = (DLine *) ckalloc(sizeof(DLine));
|
||
dlPtr->index = *indexPtr;
|
||
dlPtr->count = 0;
|
||
dlPtr->y = 0;
|
||
dlPtr->oldY = -1;
|
||
dlPtr->height = 0;
|
||
dlPtr->baseline = 0;
|
||
dlPtr->chunkPtr = NULL;
|
||
dlPtr->nextPtr = NULL;
|
||
dlPtr->flags = NEW_LAYOUT;
|
||
|
||
/*
|
||
* Each iteration of the loop below creates one TkTextDispChunk for
|
||
* the new display line. The line will always have at least one
|
||
* chunk (for the newline character at the end, if there's nothing
|
||
* else available).
|
||
*/
|
||
|
||
curIndex = *indexPtr;
|
||
lastChunkPtr = NULL;
|
||
chunkPtr = NULL;
|
||
noCharsYet = 1;
|
||
breakChunkPtr = NULL;
|
||
breakCharOffset = 0;
|
||
justify = TK_JUSTIFY_LEFT;
|
||
tabIndex = -1;
|
||
tabChunkPtr = NULL;
|
||
tabArrayPtr = NULL;
|
||
rMargin = 0;
|
||
wrapMode = tkTextCharUid;
|
||
tabSize = 0;
|
||
lastCharChunkPtr = NULL;
|
||
|
||
/*
|
||
* Find the first segment to consider for the line. Can't call
|
||
* TkTextIndexToSeg for this because it won't return a segment
|
||
* with zero size (such as the insertion cursor's mark).
|
||
*/
|
||
|
||
for (offset = curIndex.charIndex, segPtr = curIndex.linePtr->segPtr;
|
||
(offset > 0) && (offset >= segPtr->size);
|
||
offset -= segPtr->size, segPtr = segPtr->nextPtr) {
|
||
/* Empty loop body. */
|
||
}
|
||
|
||
while (segPtr != NULL) {
|
||
if (segPtr->typePtr->layoutProc == NULL) {
|
||
segPtr = segPtr->nextPtr;
|
||
offset = 0;
|
||
continue;
|
||
}
|
||
if (chunkPtr == NULL) {
|
||
chunkPtr = (TkTextDispChunk *) ckalloc(sizeof(TkTextDispChunk));
|
||
chunkPtr->nextPtr = NULL;
|
||
}
|
||
chunkPtr->stylePtr = GetStyle(textPtr, &curIndex);
|
||
|
||
/*
|
||
* Save style information such as justification and indentation,
|
||
* up until the first character is encountered, then retain that
|
||
* information for the rest of the line.
|
||
*/
|
||
|
||
if (noCharsYet) {
|
||
tabArrayPtr = chunkPtr->stylePtr->sValuePtr->tabArrayPtr;
|
||
justify = chunkPtr->stylePtr->sValuePtr->justify;
|
||
rMargin = chunkPtr->stylePtr->sValuePtr->rMargin;
|
||
wrapMode = chunkPtr->stylePtr->sValuePtr->wrapMode;
|
||
x = ((curIndex.charIndex == 0)
|
||
? chunkPtr->stylePtr->sValuePtr->lMargin1
|
||
: chunkPtr->stylePtr->sValuePtr->lMargin2);
|
||
if (wrapMode == tkTextNoneUid) {
|
||
maxX = INT_MAX;
|
||
} else {
|
||
maxX = textPtr->dInfoPtr->maxX - textPtr->dInfoPtr->x
|
||
- rMargin;
|
||
if (maxX < x) {
|
||
maxX = x;
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
* See if there is a tab in the current chunk; if so, only
|
||
* layout characters up to (and including) the tab.
|
||
*/
|
||
|
||
gotTab = 0;
|
||
maxChars = segPtr->size - offset;
|
||
if (justify == TK_JUSTIFY_LEFT) {
|
||
if (segPtr->typePtr == &tkTextCharType) {
|
||
char *p;
|
||
|
||
for (p = segPtr->body.chars + offset; *p != 0; p++) {
|
||
if (*p == '\t') {
|
||
maxChars = (p + 1 - segPtr->body.chars) - offset;
|
||
gotTab = 1;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
chunkPtr->x = x;
|
||
code = (*segPtr->typePtr->layoutProc)(textPtr, &curIndex, segPtr,
|
||
offset, maxX-tabSize, maxChars, noCharsYet, wrapMode,
|
||
chunkPtr);
|
||
if (code <= 0) {
|
||
FreeStyle(textPtr, chunkPtr->stylePtr);
|
||
if (code < 0) {
|
||
/*
|
||
* This segment doesn't wish to display itself (e.g. most
|
||
* marks).
|
||
*/
|
||
|
||
segPtr = segPtr->nextPtr;
|
||
offset = 0;
|
||
continue;
|
||
}
|
||
|
||
/*
|
||
* No characters from this segment fit in the window: this
|
||
* means we're at the end of the display line.
|
||
*/
|
||
|
||
if (chunkPtr != NULL) {
|
||
ckfree((char *) chunkPtr);
|
||
}
|
||
break;
|
||
}
|
||
if (chunkPtr->numChars > 0) {
|
||
noCharsYet = 0;
|
||
lastCharChunkPtr = chunkPtr;
|
||
}
|
||
if (lastChunkPtr == NULL) {
|
||
dlPtr->chunkPtr = chunkPtr;
|
||
} else {
|
||
lastChunkPtr->nextPtr = chunkPtr;
|
||
}
|
||
lastChunkPtr = chunkPtr;
|
||
x += chunkPtr->width;
|
||
if (chunkPtr->breakIndex > 0) {
|
||
breakCharOffset = chunkPtr->breakIndex;
|
||
breakIndex = curIndex;
|
||
breakChunkPtr = chunkPtr;
|
||
}
|
||
if (chunkPtr->numChars != maxChars) {
|
||
break;
|
||
}
|
||
|
||
/*
|
||
* If we're at a new tab, adjust the layout for all the chunks
|
||
* pertaining to the previous tab. Also adjust the amount of
|
||
* space left in the line to account for space that will be eaten
|
||
* up by the tab.
|
||
*/
|
||
|
||
if (gotTab) {
|
||
if (tabIndex >= 0) {
|
||
AdjustForTab(textPtr, tabArrayPtr, tabIndex, tabChunkPtr);
|
||
x = chunkPtr->x + chunkPtr->width;
|
||
}
|
||
tabIndex++;
|
||
tabChunkPtr = chunkPtr;
|
||
tabSize = SizeOfTab(textPtr, tabArrayPtr, tabIndex, x, maxX);
|
||
if (tabSize >= (maxX - x)) {
|
||
break;
|
||
}
|
||
}
|
||
curIndex.charIndex += chunkPtr->numChars;
|
||
offset += chunkPtr->numChars;
|
||
if (offset >= segPtr->size) {
|
||
offset = 0;
|
||
segPtr = segPtr->nextPtr;
|
||
}
|
||
chunkPtr = NULL;
|
||
}
|
||
if (noCharsYet) {
|
||
panic("LayoutDLine couldn't place any characters on a line");
|
||
}
|
||
wholeLine = (segPtr == NULL);
|
||
|
||
/*
|
||
* We're at the end of the display line. Throw away everything
|
||
* after the most recent word break, if there is one; this may
|
||
* potentially require the last chunk to be layed out again.
|
||
*/
|
||
|
||
if (breakChunkPtr == NULL) {
|
||
/*
|
||
* This code makes sure that we don't accidentally display
|
||
* chunks with no characters at the end of the line (such as
|
||
* the insertion cursor). These chunks belong on the next
|
||
* line. So, throw away everything after the last chunk that
|
||
* has characters in it.
|
||
*/
|
||
|
||
breakChunkPtr = lastCharChunkPtr;
|
||
breakCharOffset = breakChunkPtr->numChars;
|
||
}
|
||
if ((breakChunkPtr != NULL) && ((lastChunkPtr != breakChunkPtr)
|
||
|| (breakCharOffset != lastChunkPtr->numChars))) {
|
||
while (1) {
|
||
chunkPtr = breakChunkPtr->nextPtr;
|
||
if (chunkPtr == NULL) {
|
||
break;
|
||
}
|
||
FreeStyle(textPtr, chunkPtr->stylePtr);
|
||
breakChunkPtr->nextPtr = chunkPtr->nextPtr;
|
||
(*chunkPtr->undisplayProc)(textPtr, chunkPtr);
|
||
ckfree((char *) chunkPtr);
|
||
}
|
||
if (breakCharOffset != breakChunkPtr->numChars) {
|
||
(*breakChunkPtr->undisplayProc)(textPtr, breakChunkPtr);
|
||
segPtr = TkTextIndexToSeg(&breakIndex, &offset);
|
||
(*segPtr->typePtr->layoutProc)(textPtr, &breakIndex,
|
||
segPtr, offset, maxX, breakCharOffset, 0,
|
||
wrapMode, breakChunkPtr);
|
||
}
|
||
lastChunkPtr = breakChunkPtr;
|
||
wholeLine = 0;
|
||
}
|
||
|
||
/*
|
||
* Make tab adjustments for the last tab stop, if there is one.
|
||
*/
|
||
|
||
if ((tabIndex >= 0) && (tabChunkPtr != NULL)) {
|
||
AdjustForTab(textPtr, tabArrayPtr, tabIndex, tabChunkPtr);
|
||
}
|
||
|
||
/*
|
||
* Make one more pass over the line to recompute various things
|
||
* like its height, length, and total number of characters. Also
|
||
* modify the x-locations of chunks to reflect justification.
|
||
* If we're not wrapping, I'm not sure what is the best way to
|
||
* handle left and center justification: should the total length,
|
||
* for purposes of justification, be (a) the window width, (b)
|
||
* the length of the longest line in the window, or (c) the length
|
||
* of the longest line in the text? (c) isn't available, (b) seems
|
||
* weird, since it can change with vertical scrolling, so (a) is
|
||
* what is implemented below.
|
||
*/
|
||
|
||
if (wrapMode == tkTextNoneUid) {
|
||
maxX = textPtr->dInfoPtr->maxX - textPtr->dInfoPtr->x - rMargin;
|
||
}
|
||
dlPtr->length = lastChunkPtr->x + lastChunkPtr->width;
|
||
if (justify == TK_JUSTIFY_LEFT) {
|
||
jIndent = 0;
|
||
} else if (justify == TK_JUSTIFY_RIGHT) {
|
||
jIndent = maxX - dlPtr->length;
|
||
} else {
|
||
jIndent = (maxX - dlPtr->length)/2;
|
||
}
|
||
ascent = descent = 0;
|
||
for (chunkPtr = dlPtr->chunkPtr; chunkPtr != NULL;
|
||
chunkPtr = chunkPtr->nextPtr) {
|
||
chunkPtr->x += jIndent;
|
||
dlPtr->count += chunkPtr->numChars;
|
||
if (chunkPtr->minAscent > ascent) {
|
||
ascent = chunkPtr->minAscent;
|
||
}
|
||
if (chunkPtr->minDescent > descent) {
|
||
descent = chunkPtr->minDescent;
|
||
}
|
||
if (chunkPtr->minHeight > dlPtr->height) {
|
||
dlPtr->height = chunkPtr->minHeight;
|
||
}
|
||
sValuePtr = chunkPtr->stylePtr->sValuePtr;
|
||
if ((sValuePtr->borderWidth > 0)
|
||
&& (sValuePtr->relief != TK_RELIEF_FLAT)) {
|
||
dlPtr->flags |= HAS_3D_BORDER;
|
||
}
|
||
}
|
||
if (dlPtr->height < (ascent + descent)) {
|
||
dlPtr->height = ascent + descent;
|
||
dlPtr->baseline = ascent;
|
||
} else {
|
||
dlPtr->baseline = ascent + (dlPtr->height - ascent - descent)/2;
|
||
}
|
||
sValuePtr = dlPtr->chunkPtr->stylePtr->sValuePtr;
|
||
if (dlPtr->index.charIndex == 0) {
|
||
dlPtr->spaceAbove = sValuePtr->spacing1;
|
||
} else {
|
||
dlPtr->spaceAbove = sValuePtr->spacing2 - sValuePtr->spacing2/2;
|
||
}
|
||
if (wholeLine) {
|
||
dlPtr->spaceBelow = sValuePtr->spacing3;
|
||
} else {
|
||
dlPtr->spaceBelow = sValuePtr->spacing2/2;
|
||
}
|
||
dlPtr->height += dlPtr->spaceAbove + dlPtr->spaceBelow;
|
||
dlPtr->baseline += dlPtr->spaceAbove;
|
||
|
||
/*
|
||
* Recompute line length: may have changed because of justification.
|
||
*/
|
||
|
||
dlPtr->length = lastChunkPtr->x + lastChunkPtr->width;
|
||
return dlPtr;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* UpdateDisplayInfo --
|
||
*
|
||
* This procedure is invoked to recompute some or all of the
|
||
* DLine structures for a text widget. At the time it is called
|
||
* the DLine structures still left in the widget are guaranteed
|
||
* to be correct except that (a) the y-coordinates aren't
|
||
* necessarily correct, (b) there may be missing structures
|
||
* (the DLine structures get removed as soon as they are potentially
|
||
* out-of-date), and (c) DLine structures that don't start at the
|
||
* beginning of a line may be incorrect if previous information in
|
||
* the same line changed size in a way that moved a line boundary
|
||
* (DLines for any info that changed will have been deleted, but
|
||
* not DLines for unchanged info in the same text line).
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Upon return, the DLine information for textPtr correctly reflects
|
||
* the positions where characters will be displayed. However, this
|
||
* procedure doesn't actually bring the display up-to-date.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
UpdateDisplayInfo(textPtr)
|
||
TkText *textPtr; /* Text widget to update. */
|
||
{
|
||
register TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
register DLine *dlPtr, *prevPtr;
|
||
TkTextIndex index;
|
||
TkTextLine *lastLinePtr;
|
||
int y, maxY, pixelOffset, maxOffset;
|
||
|
||
if (!(dInfoPtr->flags & DINFO_OUT_OF_DATE)) {
|
||
return;
|
||
}
|
||
dInfoPtr->flags &= ~DINFO_OUT_OF_DATE;
|
||
|
||
/*
|
||
* Delete any DLines that are now above the top of the window.
|
||
*/
|
||
|
||
index = textPtr->topIndex;
|
||
dlPtr = FindDLine(dInfoPtr->dLinePtr, &index);
|
||
if ((dlPtr != NULL) && (dlPtr != dInfoPtr->dLinePtr)) {
|
||
FreeDLines(textPtr, dInfoPtr->dLinePtr, dlPtr, 1);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
* Scan through the contents of the window from top to bottom,
|
||
* recomputing information for lines that are missing.
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
lastLinePtr = TkBTreeFindLine(textPtr->tree,
|
||
TkBTreeNumLines(textPtr->tree));
|
||
dlPtr = dInfoPtr->dLinePtr;
|
||
prevPtr = NULL;
|
||
y = dInfoPtr->y;
|
||
maxY = dInfoPtr->maxY;
|
||
while (1) {
|
||
register DLine *newPtr;
|
||
|
||
if (index.linePtr == lastLinePtr) {
|
||
break;
|
||
}
|
||
|
||
/*
|
||
* There are three possibilities right now:
|
||
* (a) the next DLine (dlPtr) corresponds exactly to the next
|
||
* information we want to display: just use it as-is.
|
||
* (b) the next DLine corresponds to a different line, or to
|
||
* a segment that will be coming later in the same line:
|
||
* leave this DLine alone in the hopes that we'll be able
|
||
* to use it later, then create a new DLine in front of
|
||
* it.
|
||
* (c) the next DLine corresponds to a segment in the line we
|
||
* want, but it's a segment that has already been processed
|
||
* or will never be processed. Delete the DLine and try
|
||
* again.
|
||
*
|
||
* One other twist on all this. It's possible for 3D borders
|
||
* to interact between lines (see DisplayLineBackground) so if
|
||
* a line is relayed out and has styles with 3D borders, its
|
||
* neighbors have to be redrawn if they have 3D borders too,
|
||
* since the interactions could have changed (the neighbors
|
||
* don't have to be relayed out, just redrawn).
|
||
*/
|
||
|
||
if ((dlPtr == NULL) || (dlPtr->index.linePtr != index.linePtr)) {
|
||
/*
|
||
* Case (b) -- must make new DLine.
|
||
*/
|
||
|
||
makeNewDLine:
|
||
if (tkTextDebug) {
|
||
char string[TK_POS_CHARS];
|
||
|
||
/*
|
||
* Debugging is enabled, so keep a log of all the lines
|
||
* that were re-layed out. The test suite uses this
|
||
* information.
|
||
*/
|
||
|
||
TkTextPrintIndex(&index, string);
|
||
Tcl_SetVar2(textPtr->interp, "tk_textRelayout", (char *) NULL,
|
||
string,
|
||
TCL_GLOBAL_ONLY|TCL_APPEND_VALUE|TCL_LIST_ELEMENT);
|
||
}
|
||
newPtr = LayoutDLine(textPtr, &index);
|
||
if (prevPtr == NULL) {
|
||
dInfoPtr->dLinePtr = newPtr;
|
||
} else {
|
||
prevPtr->nextPtr = newPtr;
|
||
if (prevPtr->flags & HAS_3D_BORDER) {
|
||
prevPtr->oldY = -1;
|
||
}
|
||
}
|
||
newPtr->nextPtr = dlPtr;
|
||
dlPtr = newPtr;
|
||
} else {
|
||
/*
|
||
* DlPtr refers to the line we want. Next check the
|
||
* index within the line.
|
||
*/
|
||
|
||
if (index.charIndex == dlPtr->index.charIndex) {
|
||
/*
|
||
* Case (a) -- can use existing display line as-is.
|
||
*/
|
||
|
||
if ((dlPtr->flags & HAS_3D_BORDER) && (prevPtr != NULL)
|
||
&& (prevPtr->flags & (NEW_LAYOUT))) {
|
||
dlPtr->oldY = -1;
|
||
}
|
||
goto lineOK;
|
||
}
|
||
if (index.charIndex < dlPtr->index.charIndex) {
|
||
goto makeNewDLine;
|
||
}
|
||
|
||
/*
|
||
* Case (c) -- dlPtr is useless. Discard it and start
|
||
* again with the next display line.
|
||
*/
|
||
|
||
newPtr = dlPtr->nextPtr;
|
||
FreeDLines(textPtr, dlPtr, newPtr, 0);
|
||
dlPtr = newPtr;
|
||
if (prevPtr != NULL) {
|
||
prevPtr->nextPtr = newPtr;
|
||
} else {
|
||
dInfoPtr->dLinePtr = newPtr;
|
||
}
|
||
continue;
|
||
}
|
||
|
||
/*
|
||
* Advance to the start of the next line.
|
||
*/
|
||
|
||
lineOK:
|
||
dlPtr->y = y;
|
||
y += dlPtr->height;
|
||
TkTextIndexForwChars(&index, dlPtr->count, &index);
|
||
prevPtr = dlPtr;
|
||
dlPtr = dlPtr->nextPtr;
|
||
|
||
/*
|
||
* If we switched text lines, delete any DLines left for the
|
||
* old text line.
|
||
*/
|
||
|
||
if (index.linePtr != prevPtr->index.linePtr) {
|
||
register DLine *nextPtr;
|
||
|
||
nextPtr = dlPtr;
|
||
while ((nextPtr != NULL)
|
||
&& (nextPtr->index.linePtr == prevPtr->index.linePtr)) {
|
||
nextPtr = nextPtr->nextPtr;
|
||
}
|
||
if (nextPtr != dlPtr) {
|
||
FreeDLines(textPtr, dlPtr, nextPtr, 0);
|
||
prevPtr->nextPtr = nextPtr;
|
||
dlPtr = nextPtr;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* It's important to have the following check here rather than in
|
||
* the while statement for the loop, so that there's always at least
|
||
* one DLine generated, regardless of how small the window is. This
|
||
* keeps a lot of other code from breaking.
|
||
*/
|
||
|
||
if (y >= maxY) {
|
||
break;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Delete any DLine structures that don't fit on the screen.
|
||
*/
|
||
|
||
FreeDLines(textPtr, dlPtr, (DLine *) NULL, 1);
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
* If there is extra space at the bottom of the window (because
|
||
* we've hit the end of the text), then bring in more lines at
|
||
* the top of the window, if there are any, to fill in the view.
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
if (y < maxY) {
|
||
int lineNum, spaceLeft, charsToCount;
|
||
DLine *lowestPtr;
|
||
|
||
/*
|
||
* Layout an entire text line (potentially > 1 display line),
|
||
* then link in as many display lines as fit without moving
|
||
* the bottom line out of the window. Repeat this until
|
||
* all the extra space has been used up or we've reached the
|
||
* beginning of the text.
|
||
*/
|
||
|
||
spaceLeft = maxY - y;
|
||
lineNum = TkBTreeLineIndex(dInfoPtr->dLinePtr->index.linePtr);
|
||
charsToCount = dInfoPtr->dLinePtr->index.charIndex;
|
||
if (charsToCount == 0) {
|
||
charsToCount = INT_MAX;
|
||
lineNum--;
|
||
}
|
||
for ( ; (lineNum >= 0) && (spaceLeft > 0); lineNum--) {
|
||
index.linePtr = TkBTreeFindLine(textPtr->tree, lineNum);
|
||
index.charIndex = 0;
|
||
lowestPtr = NULL;
|
||
do {
|
||
dlPtr = LayoutDLine(textPtr, &index);
|
||
dlPtr->nextPtr = lowestPtr;
|
||
lowestPtr = dlPtr;
|
||
TkTextIndexForwChars(&index, dlPtr->count, &index);
|
||
charsToCount -= dlPtr->count;
|
||
} while ((charsToCount > 0)
|
||
&& (index.linePtr == lowestPtr->index.linePtr));
|
||
|
||
/*
|
||
* Scan through the display lines from the bottom one up to
|
||
* the top one.
|
||
*/
|
||
|
||
while (lowestPtr != NULL) {
|
||
dlPtr = lowestPtr;
|
||
spaceLeft -= dlPtr->height;
|
||
if (spaceLeft < 0) {
|
||
break;
|
||
}
|
||
lowestPtr = dlPtr->nextPtr;
|
||
dlPtr->nextPtr = dInfoPtr->dLinePtr;
|
||
dInfoPtr->dLinePtr = dlPtr;
|
||
if (tkTextDebug) {
|
||
char string[TK_POS_CHARS];
|
||
|
||
TkTextPrintIndex(&dlPtr->index, string);
|
||
Tcl_SetVar2(textPtr->interp, "tk_textRelayout",
|
||
(char *) NULL, string,
|
||
TCL_GLOBAL_ONLY|TCL_APPEND_VALUE|TCL_LIST_ELEMENT);
|
||
}
|
||
}
|
||
FreeDLines(textPtr, lowestPtr, (DLine *) NULL, 0);
|
||
charsToCount = INT_MAX;
|
||
}
|
||
|
||
/*
|
||
* Now we're all done except that the y-coordinates in all the
|
||
* DLines are wrong and the top index for the text is wrong.
|
||
* Update them.
|
||
*/
|
||
|
||
textPtr->topIndex = dInfoPtr->dLinePtr->index;
|
||
y = dInfoPtr->y;
|
||
for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL;
|
||
dlPtr = dlPtr->nextPtr) {
|
||
if (y > dInfoPtr->maxY) {
|
||
panic("Added too many new lines in UpdateDisplayInfo");
|
||
}
|
||
dlPtr->y = y;
|
||
y += dlPtr->height;
|
||
}
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
* If the old top or bottom line has scrolled elsewhere on the
|
||
* screen, we may not be able to re-use its old contents by
|
||
* copying bits (e.g., a beveled edge that was drawn when it was
|
||
* at the top or bottom won't be drawn when the line is in the
|
||
* middle and its neighbor has a matching background). Similarly,
|
||
* if the new top or bottom line came from somewhere else on the
|
||
* screen, we may not be able to copy the old bits.
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
dlPtr = dInfoPtr->dLinePtr;
|
||
if ((dlPtr->flags & HAS_3D_BORDER) && !(dlPtr->flags & TOP_LINE)) {
|
||
dlPtr->oldY = -1;
|
||
}
|
||
while (1) {
|
||
if ((dlPtr->flags & TOP_LINE) && (dlPtr != dInfoPtr->dLinePtr)
|
||
&& (dlPtr->flags & HAS_3D_BORDER)) {
|
||
dlPtr->oldY = -1;
|
||
}
|
||
if ((dlPtr->flags & BOTTOM_LINE) && (dlPtr->nextPtr != NULL)
|
||
&& (dlPtr->flags & HAS_3D_BORDER)) {
|
||
dlPtr->oldY = -1;
|
||
}
|
||
if (dlPtr->nextPtr == NULL) {
|
||
if ((dlPtr->flags & HAS_3D_BORDER)
|
||
&& !(dlPtr->flags & BOTTOM_LINE)) {
|
||
dlPtr->oldY = -1;
|
||
}
|
||
dlPtr->flags &= ~TOP_LINE;
|
||
dlPtr->flags |= BOTTOM_LINE;
|
||
break;
|
||
}
|
||
dlPtr->flags &= ~(TOP_LINE|BOTTOM_LINE);
|
||
dlPtr = dlPtr->nextPtr;
|
||
}
|
||
dInfoPtr->dLinePtr->flags |= TOP_LINE;
|
||
|
||
/*
|
||
* Arrange for scrollbars to be updated.
|
||
*/
|
||
|
||
textPtr->flags |= UPDATE_SCROLLBARS;
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
* Deal with horizontal scrolling:
|
||
* 1. If there's empty space to the right of the longest line,
|
||
* shift the screen to the right to fill in the empty space.
|
||
* 2. If the desired horizontal scroll position has changed,
|
||
* force a full redisplay of all the lines in the widget.
|
||
* 3. If the wrap mode isn't "none" then re-scroll to the base
|
||
* position.
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
dInfoPtr->maxLength = 0;
|
||
for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL;
|
||
dlPtr = dlPtr->nextPtr) {
|
||
if (dlPtr->length > dInfoPtr->maxLength) {
|
||
dInfoPtr->maxLength = dlPtr->length;
|
||
}
|
||
}
|
||
maxOffset = (dInfoPtr->maxLength - (dInfoPtr->maxX - dInfoPtr->x)
|
||
+ textPtr->charWidth - 1)/textPtr->charWidth;
|
||
if (dInfoPtr->newCharOffset > maxOffset) {
|
||
dInfoPtr->newCharOffset = maxOffset;
|
||
}
|
||
if (dInfoPtr->newCharOffset < 0) {
|
||
dInfoPtr->newCharOffset = 0;
|
||
}
|
||
pixelOffset = dInfoPtr->newCharOffset * textPtr->charWidth;
|
||
if (pixelOffset != dInfoPtr->curPixelOffset) {
|
||
dInfoPtr->curPixelOffset = pixelOffset;
|
||
for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL;
|
||
dlPtr = dlPtr->nextPtr) {
|
||
dlPtr->oldY = -1;
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* FreeDLines --
|
||
*
|
||
* This procedure is called to free up all of the resources
|
||
* associated with one or more DLine structures.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Memory gets freed and various other resources are released.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
FreeDLines(textPtr, firstPtr, lastPtr, unlink)
|
||
TkText *textPtr; /* Information about overall text
|
||
* widget. */
|
||
register DLine *firstPtr; /* Pointer to first DLine to free up. */
|
||
DLine *lastPtr; /* Pointer to DLine just after last
|
||
* one to free (NULL means everything
|
||
* starting with firstPtr). */
|
||
int unlink; /* 1 means DLines are currently linked
|
||
* into the list rooted at
|
||
* textPtr->dInfoPtr->dLinePtr and
|
||
* they have to be unlinked. 0 means
|
||
* just free without unlinking. */
|
||
{
|
||
register TkTextDispChunk *chunkPtr, *nextChunkPtr;
|
||
register DLine *nextDLinePtr;
|
||
|
||
if (unlink) {
|
||
if (textPtr->dInfoPtr->dLinePtr == firstPtr) {
|
||
textPtr->dInfoPtr->dLinePtr = lastPtr;
|
||
} else {
|
||
register DLine *prevPtr;
|
||
for (prevPtr = textPtr->dInfoPtr->dLinePtr;
|
||
prevPtr->nextPtr != firstPtr; prevPtr = prevPtr->nextPtr) {
|
||
/* Empty loop body. */
|
||
}
|
||
prevPtr->nextPtr = lastPtr;
|
||
}
|
||
}
|
||
while (firstPtr != lastPtr) {
|
||
nextDLinePtr = firstPtr->nextPtr;
|
||
for (chunkPtr = firstPtr->chunkPtr; chunkPtr != NULL;
|
||
chunkPtr = nextChunkPtr) {
|
||
if (chunkPtr->undisplayProc != NULL) {
|
||
(*chunkPtr->undisplayProc)(textPtr, chunkPtr);
|
||
}
|
||
FreeStyle(textPtr, chunkPtr->stylePtr);
|
||
nextChunkPtr = chunkPtr->nextPtr;
|
||
ckfree((char *) chunkPtr);
|
||
}
|
||
ckfree((char *) firstPtr);
|
||
firstPtr = nextDLinePtr;
|
||
}
|
||
textPtr->dInfoPtr->dLinesInvalidated = 1;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* DisplayDLine --
|
||
*
|
||
* This procedure is invoked to draw a single line on the
|
||
* screen.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The line given by dlPtr is drawn at its correct position in
|
||
* textPtr's window. Note that this is one *display* line, not
|
||
* one *text* line.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
DisplayDLine(textPtr, dlPtr, prevPtr, pixmap)
|
||
TkText *textPtr; /* Text widget in which to draw line. */
|
||
register DLine *dlPtr; /* Information about line to draw. */
|
||
DLine *prevPtr; /* Line just before one to draw, or NULL
|
||
* if dlPtr is the top line. */
|
||
Pixmap pixmap; /* Pixmap to use for double-buffering.
|
||
* Caller must make sure it's large enough
|
||
* to hold line. */
|
||
{
|
||
register TkTextDispChunk *chunkPtr;
|
||
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
Display *display;
|
||
int height, x;
|
||
|
||
/*
|
||
* First, clear the area of the line to the background color for the
|
||
* text widget.
|
||
*/
|
||
|
||
display = Tk_Display(textPtr->tkwin);
|
||
Tk_Fill3DRectangle(textPtr->tkwin, pixmap, textPtr->border, 0, 0,
|
||
Tk_Width(textPtr->tkwin), dlPtr->height, 0, TK_RELIEF_FLAT);
|
||
|
||
/*
|
||
* Next, draw background information for the whole line.
|
||
*/
|
||
|
||
DisplayLineBackground(textPtr, dlPtr, prevPtr, pixmap);
|
||
|
||
/*
|
||
* Make another pass through all of the chunks to redraw the
|
||
* insertion cursor, if it is visible on this line. Must do
|
||
* it here rather than in the foreground pass below because
|
||
* otherwise a wide insertion cursor will obscure the character
|
||
* to its left.
|
||
*/
|
||
|
||
if (textPtr->state == tkNormalUid) {
|
||
for (chunkPtr = dlPtr->chunkPtr; (chunkPtr != NULL);
|
||
chunkPtr = chunkPtr->nextPtr) {
|
||
x = chunkPtr->x + dInfoPtr->x - dInfoPtr->curPixelOffset;
|
||
if (chunkPtr->displayProc == TkTextInsertDisplayProc) {
|
||
(*chunkPtr->displayProc)(chunkPtr, x, dlPtr->spaceAbove,
|
||
dlPtr->height - dlPtr->spaceAbove - dlPtr->spaceBelow,
|
||
dlPtr->baseline - dlPtr->spaceAbove, display, pixmap,
|
||
dlPtr->y + dlPtr->spaceAbove);
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Make yet another pass through all of the chunks to redraw all of
|
||
* foreground information. Note: we have to call the displayProc
|
||
* even for chunks that are off-screen. This is needed, for
|
||
* example, so that embedded windows can be unmapped in this case.
|
||
* Conve
|
||
*/
|
||
|
||
for (chunkPtr = dlPtr->chunkPtr; (chunkPtr != NULL);
|
||
chunkPtr = chunkPtr->nextPtr) {
|
||
if (chunkPtr->displayProc == TkTextInsertDisplayProc) {
|
||
/*
|
||
* Already displayed the insertion cursor above. Don't
|
||
* do it again here.
|
||
*/
|
||
|
||
continue;
|
||
}
|
||
x = chunkPtr->x + dInfoPtr->x - dInfoPtr->curPixelOffset;
|
||
if ((x + chunkPtr->width <= 0) || (x >= dInfoPtr->maxX)) {
|
||
/*
|
||
* Note: we have to call the displayProc even for chunks
|
||
* that are off-screen. This is needed, for example, so
|
||
* that embedded windows can be unmapped in this case.
|
||
* Display the chunk at a coordinate that can be clearly
|
||
* identified by the displayProc as being off-screen to
|
||
* the left (the displayProc may not be able to tell if
|
||
* something is off to the right).
|
||
*/
|
||
|
||
(*chunkPtr->displayProc)(chunkPtr, -chunkPtr->width,
|
||
dlPtr->spaceAbove,
|
||
dlPtr->height - dlPtr->spaceAbove - dlPtr->spaceBelow,
|
||
dlPtr->baseline - dlPtr->spaceAbove, display, pixmap,
|
||
dlPtr->y + dlPtr->spaceAbove);
|
||
} else {
|
||
(*chunkPtr->displayProc)(chunkPtr, x, dlPtr->spaceAbove,
|
||
dlPtr->height - dlPtr->spaceAbove - dlPtr->spaceBelow,
|
||
dlPtr->baseline - dlPtr->spaceAbove, display, pixmap,
|
||
dlPtr->y + dlPtr->spaceAbove);
|
||
}
|
||
if (dInfoPtr->dLinesInvalidated) {
|
||
return;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Copy the pixmap onto the screen. If this is the last line on
|
||
* the screen then copy a piece of the line, so that it doesn't
|
||
* overflow into the border area. Another special trick: copy the
|
||
* padding area to the left of the line; this is because the
|
||
* insertion cursor sometimes overflows onto that area and we want
|
||
* to get as much of the cursor as possible.
|
||
*/
|
||
|
||
height = dlPtr->height;
|
||
if ((height + dlPtr->y) > dInfoPtr->maxY) {
|
||
height = dInfoPtr->maxY - dlPtr->y;
|
||
}
|
||
XCopyArea(display, pixmap, Tk_WindowId(textPtr->tkwin), dInfoPtr->copyGC,
|
||
dInfoPtr->x, 0, (unsigned) (dInfoPtr->maxX - dInfoPtr->x),
|
||
(unsigned) height, dInfoPtr->x, dlPtr->y);
|
||
linesRedrawn++;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* DisplayLineBackground --
|
||
*
|
||
* This procedure is called to fill in the background for
|
||
* a display line. It draws 3D borders cleverly so that
|
||
* adjacent chunks with the same style (whether on the same
|
||
* line or different lines) have a single 3D border around
|
||
* the whole region.
|
||
*
|
||
* Results:
|
||
* There is no return value. Pixmap is filled in with background
|
||
* information for dlPtr.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
DisplayLineBackground(textPtr, dlPtr, prevPtr, pixmap)
|
||
TkText *textPtr; /* Text widget containing line. */
|
||
register DLine *dlPtr; /* Information about line to draw. */
|
||
DLine *prevPtr; /* Line just above dlPtr, or NULL if dlPtr
|
||
* is the top-most line in the window. */
|
||
Pixmap pixmap; /* Pixmap to use for double-buffering.
|
||
* Caller must make sure it's large enough
|
||
* to hold line. Caller must also have
|
||
* filled it with the background color for
|
||
* the widget. */
|
||
{
|
||
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
TkTextDispChunk *chunkPtr; /* Pointer to chunk in the current line. */
|
||
TkTextDispChunk *chunkPtr2; /* Pointer to chunk in the line above or
|
||
* below the current one. NULL if we're to
|
||
* the left of or to the right of the chunks
|
||
* in the line. */
|
||
TkTextDispChunk *nextPtr2; /* Next chunk after chunkPtr2 (it's not the
|
||
* same as chunkPtr2->nextPtr in the case
|
||
* where chunkPtr2 is NULL because the line
|
||
* is indented). */
|
||
int leftX; /* The left edge of the region we're
|
||
* currently working on. */
|
||
int leftXIn; /* 1 means beveled edge at leftX slopes right
|
||
* as it goes down, 0 means it slopes left
|
||
* as it goes down. */
|
||
int rightX; /* Right edge of chunkPtr. */
|
||
int rightX2; /* Right edge of chunkPtr2. */
|
||
int matchLeft; /* Does the style of this line match that
|
||
* of its neighbor just to the left of
|
||
* the current x coordinate? */
|
||
int matchRight; /* Does line's style match its neighbor
|
||
* just to the right of the current x-coord? */
|
||
int minX, maxX, xOffset;
|
||
StyleValues *sValuePtr;
|
||
Display *display;
|
||
|
||
/*
|
||
* Pass 1: scan through dlPtr from left to right. For each range of
|
||
* chunks with the same style, draw the main background for the style
|
||
* plus the vertical parts of the 3D borders (the left and right
|
||
* edges).
|
||
*/
|
||
|
||
display = Tk_Display(textPtr->tkwin);
|
||
minX = dInfoPtr->curPixelOffset;
|
||
xOffset = dInfoPtr->x - minX;
|
||
maxX = minX + dInfoPtr->maxX - dInfoPtr->x;
|
||
chunkPtr = dlPtr->chunkPtr;
|
||
|
||
/*
|
||
* Note A: in the following statement, and a few others later in
|
||
* this file marked with "See Note A above", the right side of the
|
||
* assignment was replaced with 0 on 6/18/97. This has the effect
|
||
* of highlighting the empty space to the left of a line whenever
|
||
* the leftmost character of the line is highlighted. This way,
|
||
* multi-line highlights always line up along their left edges.
|
||
* However, this may look funny in the case where a single word is
|
||
* highlighted. To undo the change, replace "leftX = 0" with "leftX
|
||
* = chunkPtr->x" and "rightX2 = 0" with "rightX2 = nextPtr2->x"
|
||
* here and at all the marked points below. This restores the old
|
||
* behavior where empty space to the left of a line is not
|
||
* highlighted, leaving a ragged left edge for multi-line
|
||
* highlights.
|
||
*/
|
||
|
||
leftX = 0;
|
||
for (; leftX < maxX; chunkPtr = chunkPtr->nextPtr) {
|
||
if ((chunkPtr->nextPtr != NULL)
|
||
&& SAME_BACKGROUND(chunkPtr->nextPtr->stylePtr,
|
||
chunkPtr->stylePtr)) {
|
||
continue;
|
||
}
|
||
sValuePtr = chunkPtr->stylePtr->sValuePtr;
|
||
rightX = chunkPtr->x + chunkPtr->width;
|
||
if ((chunkPtr->nextPtr == NULL) && (rightX < maxX)) {
|
||
rightX = maxX;
|
||
}
|
||
if (chunkPtr->stylePtr->bgGC != None) {
|
||
XFillRectangle(display, pixmap, chunkPtr->stylePtr->bgGC,
|
||
leftX + xOffset, 0, (unsigned int) (rightX - leftX),
|
||
(unsigned int) dlPtr->height);
|
||
if (sValuePtr->relief != TK_RELIEF_FLAT) {
|
||
Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
|
||
leftX + xOffset, 0, sValuePtr->borderWidth,
|
||
dlPtr->height, 1, sValuePtr->relief);
|
||
Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
|
||
rightX - sValuePtr->borderWidth + xOffset,
|
||
0, sValuePtr->borderWidth, dlPtr->height, 0,
|
||
sValuePtr->relief);
|
||
}
|
||
}
|
||
leftX = rightX;
|
||
}
|
||
|
||
/*
|
||
* Pass 2: draw the horizontal bevels along the top of the line. To
|
||
* do this, scan through dlPtr from left to right while simultaneously
|
||
* scanning through the line just above dlPtr. ChunkPtr2 and nextPtr2
|
||
* refer to two adjacent chunks in the line above.
|
||
*/
|
||
|
||
chunkPtr = dlPtr->chunkPtr;
|
||
leftX = 0; /* See Note A above. */
|
||
leftXIn = 1;
|
||
rightX = chunkPtr->x + chunkPtr->width;
|
||
if ((chunkPtr->nextPtr == NULL) && (rightX < maxX)) {
|
||
rightX = maxX;
|
||
}
|
||
chunkPtr2 = NULL;
|
||
if (prevPtr != NULL) {
|
||
/*
|
||
* Find the chunk in the previous line that covers leftX.
|
||
*/
|
||
|
||
nextPtr2 = prevPtr->chunkPtr;
|
||
rightX2 = 0; /* See Note A above. */
|
||
while (rightX2 <= leftX) {
|
||
chunkPtr2 = nextPtr2;
|
||
if (chunkPtr2 == NULL) {
|
||
break;
|
||
}
|
||
nextPtr2 = chunkPtr2->nextPtr;
|
||
rightX2 = chunkPtr2->x + chunkPtr2->width;
|
||
if (nextPtr2 == NULL) {
|
||
rightX2 = INT_MAX;
|
||
}
|
||
}
|
||
} else {
|
||
nextPtr2 = NULL;
|
||
rightX2 = INT_MAX;
|
||
}
|
||
|
||
while (leftX < maxX) {
|
||
matchLeft = (chunkPtr2 != NULL)
|
||
&& SAME_BACKGROUND(chunkPtr2->stylePtr, chunkPtr->stylePtr);
|
||
sValuePtr = chunkPtr->stylePtr->sValuePtr;
|
||
if (rightX <= rightX2) {
|
||
/*
|
||
* The chunk in our line is about to end. If its style
|
||
* changes then draw the bevel for the current style.
|
||
*/
|
||
|
||
if ((chunkPtr->nextPtr == NULL)
|
||
|| !SAME_BACKGROUND(chunkPtr->stylePtr,
|
||
chunkPtr->nextPtr->stylePtr)) {
|
||
if (!matchLeft && (sValuePtr->relief != TK_RELIEF_FLAT)) {
|
||
Tk_3DHorizontalBevel(textPtr->tkwin, pixmap,
|
||
sValuePtr->border, leftX + xOffset, 0,
|
||
rightX - leftX, sValuePtr->borderWidth, leftXIn,
|
||
1, 1, sValuePtr->relief);
|
||
}
|
||
leftX = rightX;
|
||
leftXIn = 1;
|
||
|
||
/*
|
||
* If the chunk in the line above is also ending at
|
||
* the same point then advance to the next chunk in
|
||
* that line.
|
||
*/
|
||
|
||
if ((rightX == rightX2) && (chunkPtr2 != NULL)) {
|
||
goto nextChunk2;
|
||
}
|
||
}
|
||
chunkPtr = chunkPtr->nextPtr;
|
||
if (chunkPtr == NULL) {
|
||
break;
|
||
}
|
||
rightX = chunkPtr->x + chunkPtr->width;
|
||
if ((chunkPtr->nextPtr == NULL) && (rightX < maxX)) {
|
||
rightX = maxX;
|
||
}
|
||
continue;
|
||
}
|
||
|
||
/*
|
||
* The chunk in the line above is ending at an x-position where
|
||
* there is no change in the style of the current line. If the
|
||
* style above matches the current line on one side of the change
|
||
* but not on the other, we have to draw an L-shaped piece of
|
||
* bevel.
|
||
*/
|
||
|
||
matchRight = (nextPtr2 != NULL)
|
||
&& SAME_BACKGROUND(nextPtr2->stylePtr, chunkPtr->stylePtr);
|
||
if (matchLeft && !matchRight) {
|
||
if (sValuePtr->relief != TK_RELIEF_FLAT) {
|
||
Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
|
||
rightX2 - sValuePtr->borderWidth + xOffset, 0,
|
||
sValuePtr->borderWidth, sValuePtr->borderWidth, 0,
|
||
sValuePtr->relief);
|
||
}
|
||
leftX = rightX2 - sValuePtr->borderWidth;
|
||
leftXIn = 0;
|
||
} else if (!matchLeft && matchRight
|
||
&& (sValuePtr->relief != TK_RELIEF_FLAT)) {
|
||
Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
|
||
rightX2 + xOffset, 0, sValuePtr->borderWidth,
|
||
sValuePtr->borderWidth, 1, sValuePtr->relief);
|
||
Tk_3DHorizontalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
|
||
leftX + xOffset, 0, rightX2 + sValuePtr->borderWidth -leftX,
|
||
sValuePtr->borderWidth, leftXIn, 0, 1,
|
||
sValuePtr->relief);
|
||
}
|
||
|
||
nextChunk2:
|
||
chunkPtr2 = nextPtr2;
|
||
if (chunkPtr2 == NULL) {
|
||
rightX2 = INT_MAX;
|
||
} else {
|
||
nextPtr2 = chunkPtr2->nextPtr;
|
||
rightX2 = chunkPtr2->x + chunkPtr2->width;
|
||
if (nextPtr2 == NULL) {
|
||
rightX2 = INT_MAX;
|
||
}
|
||
}
|
||
}
|
||
/*
|
||
* Pass 3: draw the horizontal bevels along the bottom of the line.
|
||
* This uses the same approach as pass 2.
|
||
*/
|
||
|
||
chunkPtr = dlPtr->chunkPtr;
|
||
leftX = 0; /* See Note A above. */
|
||
leftXIn = 0;
|
||
rightX = chunkPtr->x + chunkPtr->width;
|
||
if ((chunkPtr->nextPtr == NULL) && (rightX < maxX)) {
|
||
rightX = maxX;
|
||
}
|
||
chunkPtr2 = NULL;
|
||
if (dlPtr->nextPtr != NULL) {
|
||
/*
|
||
* Find the chunk in the previous line that covers leftX.
|
||
*/
|
||
|
||
nextPtr2 = dlPtr->nextPtr->chunkPtr;
|
||
rightX2 = 0; /* See Note A above. */
|
||
while (rightX2 <= leftX) {
|
||
chunkPtr2 = nextPtr2;
|
||
if (chunkPtr2 == NULL) {
|
||
break;
|
||
}
|
||
nextPtr2 = chunkPtr2->nextPtr;
|
||
rightX2 = chunkPtr2->x + chunkPtr2->width;
|
||
if (nextPtr2 == NULL) {
|
||
rightX2 = INT_MAX;
|
||
}
|
||
}
|
||
} else {
|
||
nextPtr2 = NULL;
|
||
rightX2 = INT_MAX;
|
||
}
|
||
|
||
while (leftX < maxX) {
|
||
matchLeft = (chunkPtr2 != NULL)
|
||
&& SAME_BACKGROUND(chunkPtr2->stylePtr, chunkPtr->stylePtr);
|
||
sValuePtr = chunkPtr->stylePtr->sValuePtr;
|
||
if (rightX <= rightX2) {
|
||
if ((chunkPtr->nextPtr == NULL)
|
||
|| !SAME_BACKGROUND(chunkPtr->stylePtr,
|
||
chunkPtr->nextPtr->stylePtr)) {
|
||
if (!matchLeft && (sValuePtr->relief != TK_RELIEF_FLAT)) {
|
||
Tk_3DHorizontalBevel(textPtr->tkwin, pixmap,
|
||
sValuePtr->border, leftX + xOffset,
|
||
dlPtr->height - sValuePtr->borderWidth,
|
||
rightX - leftX, sValuePtr->borderWidth, leftXIn,
|
||
0, 0, sValuePtr->relief);
|
||
}
|
||
leftX = rightX;
|
||
leftXIn = 0;
|
||
if ((rightX == rightX2) && (chunkPtr2 != NULL)) {
|
||
goto nextChunk2b;
|
||
}
|
||
}
|
||
chunkPtr = chunkPtr->nextPtr;
|
||
if (chunkPtr == NULL) {
|
||
break;
|
||
}
|
||
rightX = chunkPtr->x + chunkPtr->width;
|
||
if ((chunkPtr->nextPtr == NULL) && (rightX < maxX)) {
|
||
rightX = maxX;
|
||
}
|
||
continue;
|
||
}
|
||
|
||
matchRight = (nextPtr2 != NULL)
|
||
&& SAME_BACKGROUND(nextPtr2->stylePtr, chunkPtr->stylePtr);
|
||
if (matchLeft && !matchRight) {
|
||
if (sValuePtr->relief != TK_RELIEF_FLAT) {
|
||
Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
|
||
rightX2 - sValuePtr->borderWidth + xOffset,
|
||
dlPtr->height - sValuePtr->borderWidth,
|
||
sValuePtr->borderWidth, sValuePtr->borderWidth, 0,
|
||
sValuePtr->relief);
|
||
}
|
||
leftX = rightX2 - sValuePtr->borderWidth;
|
||
leftXIn = 1;
|
||
} else if (!matchLeft && matchRight
|
||
&& (sValuePtr->relief != TK_RELIEF_FLAT)) {
|
||
Tk_3DVerticalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
|
||
rightX2 + xOffset, dlPtr->height - sValuePtr->borderWidth,
|
||
sValuePtr->borderWidth, sValuePtr->borderWidth,
|
||
1, sValuePtr->relief);
|
||
Tk_3DHorizontalBevel(textPtr->tkwin, pixmap, sValuePtr->border,
|
||
leftX + xOffset, dlPtr->height - sValuePtr->borderWidth,
|
||
rightX2 + sValuePtr->borderWidth - leftX,
|
||
sValuePtr->borderWidth, leftXIn, 1, 0, sValuePtr->relief);
|
||
}
|
||
|
||
nextChunk2b:
|
||
chunkPtr2 = nextPtr2;
|
||
if (chunkPtr2 == NULL) {
|
||
rightX2 = INT_MAX;
|
||
} else {
|
||
nextPtr2 = chunkPtr2->nextPtr;
|
||
rightX2 = chunkPtr2->x + chunkPtr2->width;
|
||
if (nextPtr2 == NULL) {
|
||
rightX2 = INT_MAX;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* DisplayText --
|
||
*
|
||
* This procedure is invoked as a when-idle handler to update the
|
||
* display. It only redisplays the parts of the text widget that
|
||
* are out of date.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Information is redrawn on the screen.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
DisplayText(clientData)
|
||
ClientData clientData; /* Information about widget. */
|
||
{
|
||
register TkText *textPtr = (TkText *) clientData;
|
||
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
Tk_Window tkwin;
|
||
register DLine *dlPtr;
|
||
DLine *prevPtr;
|
||
Pixmap pixmap;
|
||
int maxHeight, borders;
|
||
int bottomY = 0; /* Initialization needed only to stop
|
||
* compiler warnings. */
|
||
Tcl_Interp *interp;
|
||
|
||
if (textPtr->tkwin == NULL) {
|
||
|
||
/*
|
||
* The widget has been deleted. Don't do anything.
|
||
*/
|
||
|
||
return;
|
||
}
|
||
|
||
interp = textPtr->interp;
|
||
Tcl_Preserve((ClientData) interp);
|
||
|
||
if (tkTextDebug) {
|
||
Tcl_SetVar2(interp, "tk_textRelayout", (char *) NULL, "",
|
||
TCL_GLOBAL_ONLY);
|
||
}
|
||
|
||
if (textPtr->tkwin == NULL) {
|
||
|
||
/*
|
||
* The widget has been deleted. Don't do anything.
|
||
*/
|
||
|
||
goto end;
|
||
}
|
||
|
||
if (!Tk_IsMapped(textPtr->tkwin) || (dInfoPtr->maxX <= dInfoPtr->x)
|
||
|| (dInfoPtr->maxY <= dInfoPtr->y)) {
|
||
UpdateDisplayInfo(textPtr);
|
||
dInfoPtr->flags &= ~REDRAW_PENDING;
|
||
goto doScrollbars;
|
||
}
|
||
numRedisplays++;
|
||
if (tkTextDebug) {
|
||
Tcl_SetVar2(interp, "tk_textRedraw", (char *) NULL, "",
|
||
TCL_GLOBAL_ONLY);
|
||
}
|
||
|
||
if (textPtr->tkwin == NULL) {
|
||
|
||
/*
|
||
* The widget has been deleted. Don't do anything.
|
||
*/
|
||
|
||
goto end;
|
||
}
|
||
|
||
/*
|
||
* Choose a new current item if that is needed (this could cause
|
||
* event handlers to be invoked, hence the preserve/release calls
|
||
* and the loop, since the handlers could conceivably necessitate
|
||
* yet another current item calculation). The tkwin check is because
|
||
* the whole window could go away in the Tcl_Release call.
|
||
*/
|
||
|
||
while (dInfoPtr->flags & REPICK_NEEDED) {
|
||
Tcl_Preserve((ClientData) textPtr);
|
||
dInfoPtr->flags &= ~REPICK_NEEDED;
|
||
TkTextPickCurrent(textPtr, &textPtr->pickEvent);
|
||
tkwin = textPtr->tkwin;
|
||
Tcl_Release((ClientData) textPtr);
|
||
if (tkwin == NULL) {
|
||
goto end;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* First recompute what's supposed to be displayed.
|
||
*/
|
||
|
||
UpdateDisplayInfo(textPtr);
|
||
dInfoPtr->dLinesInvalidated = 0;
|
||
|
||
/*
|
||
* See if it's possible to bring some parts of the screen up-to-date
|
||
* by scrolling (copying from other parts of the screen).
|
||
*/
|
||
|
||
for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL; dlPtr = dlPtr->nextPtr) {
|
||
register DLine *dlPtr2;
|
||
int offset, height, y, oldY;
|
||
TkRegion damageRgn;
|
||
|
||
if ((dlPtr->oldY == -1) || (dlPtr->y == dlPtr->oldY)
|
||
|| ((dlPtr->oldY + dlPtr->height) > dInfoPtr->maxY)) {
|
||
continue;
|
||
}
|
||
|
||
/*
|
||
* This line is already drawn somewhere in the window so it only
|
||
* needs to be copied to its new location. See if there's a group
|
||
* of lines that can all be copied together.
|
||
*/
|
||
|
||
offset = dlPtr->y - dlPtr->oldY;
|
||
height = dlPtr->height;
|
||
y = dlPtr->y;
|
||
for (dlPtr2 = dlPtr->nextPtr; dlPtr2 != NULL;
|
||
dlPtr2 = dlPtr2->nextPtr) {
|
||
if ((dlPtr2->oldY == -1)
|
||
|| ((dlPtr2->oldY + offset) != dlPtr2->y)
|
||
|| ((dlPtr2->oldY + dlPtr2->height) > dInfoPtr->maxY)) {
|
||
break;
|
||
}
|
||
height += dlPtr2->height;
|
||
}
|
||
|
||
/*
|
||
* Reduce the height of the area being copied if necessary to
|
||
* avoid overwriting the border area.
|
||
*/
|
||
|
||
if ((y + height) > dInfoPtr->maxY) {
|
||
height = dInfoPtr->maxY -y;
|
||
}
|
||
oldY = dlPtr->oldY;
|
||
|
||
/*
|
||
* Update the lines we are going to scroll to show that they
|
||
* have been copied.
|
||
*/
|
||
|
||
while (1) {
|
||
dlPtr->oldY = dlPtr->y;
|
||
if (dlPtr->nextPtr == dlPtr2) {
|
||
break;
|
||
}
|
||
dlPtr = dlPtr->nextPtr;
|
||
}
|
||
|
||
/*
|
||
* Scan through the lines following the copied ones to see if
|
||
* we are going to overwrite them with the copy operation.
|
||
* If so, mark them for redisplay.
|
||
*/
|
||
|
||
for ( ; dlPtr2 != NULL; dlPtr2 = dlPtr2->nextPtr) {
|
||
if ((dlPtr2->oldY != -1)
|
||
&& ((dlPtr2->oldY + dlPtr2->height) > y)
|
||
&& (dlPtr2->oldY < (y + height))) {
|
||
dlPtr2->oldY = -1;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Now scroll the lines. This may generate damage which we
|
||
* handle by calling TextInvalidateRegion to mark the display
|
||
* blocks as stale.
|
||
*/
|
||
|
||
damageRgn = TkCreateRegion();
|
||
if (TkScrollWindow(textPtr->tkwin, dInfoPtr->scrollGC,
|
||
dInfoPtr->x, oldY,
|
||
(dInfoPtr->maxX - dInfoPtr->x), height,
|
||
0, y - oldY, damageRgn)) {
|
||
TextInvalidateRegion(textPtr, damageRgn);
|
||
}
|
||
numCopies++;
|
||
TkDestroyRegion(damageRgn);
|
||
}
|
||
|
||
/*
|
||
* Clear the REDRAW_PENDING flag here. This is actually pretty
|
||
* tricky. We want to wait until *after* doing the scrolling,
|
||
* since that could generate more areas to redraw and don't
|
||
* want to reschedule a redisplay for them. On the other hand,
|
||
* we can't wait until after all the redisplaying, because the
|
||
* act of redisplaying could actually generate more redisplays
|
||
* (e.g. in the case of a nested window with event bindings triggered
|
||
* by redisplay).
|
||
*/
|
||
|
||
dInfoPtr->flags &= ~REDRAW_PENDING;
|
||
|
||
/*
|
||
* Redraw the borders if that's needed.
|
||
*/
|
||
|
||
if (dInfoPtr->flags & REDRAW_BORDERS) {
|
||
if (tkTextDebug) {
|
||
Tcl_SetVar2(interp, "tk_textRedraw", (char *) NULL, "borders",
|
||
TCL_GLOBAL_ONLY|TCL_APPEND_VALUE|TCL_LIST_ELEMENT);
|
||
}
|
||
|
||
if (textPtr->tkwin == NULL) {
|
||
|
||
/*
|
||
* The widget has been deleted. Don't do anything.
|
||
*/
|
||
|
||
goto end;
|
||
}
|
||
Tk_Draw3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin),
|
||
textPtr->border, textPtr->highlightWidth,
|
||
textPtr->highlightWidth,
|
||
Tk_Width(textPtr->tkwin) - 2*textPtr->highlightWidth,
|
||
Tk_Height(textPtr->tkwin) - 2*textPtr->highlightWidth,
|
||
textPtr->borderWidth, textPtr->relief);
|
||
if (textPtr->highlightWidth != 0) {
|
||
GC gc;
|
||
|
||
if (textPtr->flags & GOT_FOCUS) {
|
||
gc = Tk_GCForColor(textPtr->highlightColorPtr,
|
||
Tk_WindowId(textPtr->tkwin));
|
||
} else {
|
||
gc = Tk_GCForColor(textPtr->highlightBgColorPtr,
|
||
Tk_WindowId(textPtr->tkwin));
|
||
}
|
||
Tk_DrawFocusHighlight(textPtr->tkwin, gc, textPtr->highlightWidth,
|
||
Tk_WindowId(textPtr->tkwin));
|
||
}
|
||
borders = textPtr->borderWidth + textPtr->highlightWidth;
|
||
if (textPtr->padY > 0) {
|
||
Tk_Fill3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin),
|
||
textPtr->border, borders, borders,
|
||
Tk_Width(textPtr->tkwin) - 2*borders, textPtr->padY,
|
||
0, TK_RELIEF_FLAT);
|
||
Tk_Fill3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin),
|
||
textPtr->border, borders,
|
||
Tk_Height(textPtr->tkwin) - borders - textPtr->padY,
|
||
Tk_Width(textPtr->tkwin) - 2*borders,
|
||
textPtr->padY, 0, TK_RELIEF_FLAT);
|
||
}
|
||
if (textPtr->padX > 0) {
|
||
Tk_Fill3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin),
|
||
textPtr->border, borders, borders + textPtr->padY,
|
||
textPtr->padX,
|
||
Tk_Height(textPtr->tkwin) - 2*borders -2*textPtr->padY,
|
||
0, TK_RELIEF_FLAT);
|
||
Tk_Fill3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin),
|
||
textPtr->border,
|
||
Tk_Width(textPtr->tkwin) - borders - textPtr->padX,
|
||
borders + textPtr->padY, textPtr->padX,
|
||
Tk_Height(textPtr->tkwin) - 2*borders -2*textPtr->padY,
|
||
0, TK_RELIEF_FLAT);
|
||
}
|
||
dInfoPtr->flags &= ~REDRAW_BORDERS;
|
||
}
|
||
|
||
/*
|
||
* Now we have to redraw the lines that couldn't be updated by
|
||
* scrolling. First, compute the height of the largest line and
|
||
* allocate an off-screen pixmap to use for double-buffered
|
||
* displays.
|
||
*/
|
||
|
||
maxHeight = -1;
|
||
for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL;
|
||
dlPtr = dlPtr->nextPtr) {
|
||
if ((dlPtr->height > maxHeight) && (dlPtr->oldY != dlPtr->y)) {
|
||
maxHeight = dlPtr->height;
|
||
}
|
||
bottomY = dlPtr->y + dlPtr->height;
|
||
}
|
||
if (maxHeight > dInfoPtr->maxY) {
|
||
maxHeight = dInfoPtr->maxY;
|
||
}
|
||
if (maxHeight > 0) {
|
||
pixmap = Tk_GetPixmap(Tk_Display(textPtr->tkwin),
|
||
Tk_WindowId(textPtr->tkwin), Tk_Width(textPtr->tkwin),
|
||
maxHeight, Tk_Depth(textPtr->tkwin));
|
||
for (prevPtr = NULL, dlPtr = textPtr->dInfoPtr->dLinePtr;
|
||
(dlPtr != NULL) && (dlPtr->y < dInfoPtr->maxY);
|
||
prevPtr = dlPtr, dlPtr = dlPtr->nextPtr) {
|
||
if (dlPtr->oldY != dlPtr->y) {
|
||
if (tkTextDebug) {
|
||
char string[TK_POS_CHARS];
|
||
TkTextPrintIndex(&dlPtr->index, string);
|
||
Tcl_SetVar2(textPtr->interp, "tk_textRedraw",
|
||
(char *) NULL, string,
|
||
TCL_GLOBAL_ONLY|TCL_APPEND_VALUE|TCL_LIST_ELEMENT);
|
||
}
|
||
DisplayDLine(textPtr, dlPtr, prevPtr, pixmap);
|
||
if (dInfoPtr->dLinesInvalidated) {
|
||
Tk_FreePixmap(Tk_Display(textPtr->tkwin), pixmap);
|
||
return;
|
||
}
|
||
dlPtr->oldY = dlPtr->y;
|
||
dlPtr->flags &= ~NEW_LAYOUT;
|
||
}
|
||
}
|
||
Tk_FreePixmap(Tk_Display(textPtr->tkwin), pixmap);
|
||
}
|
||
|
||
/*
|
||
* See if we need to refresh the part of the window below the
|
||
* last line of text (if there is any such area). Refresh the
|
||
* padding area on the left too, since the insertion cursor might
|
||
* have been displayed there previously).
|
||
*/
|
||
|
||
if (dInfoPtr->topOfEof > dInfoPtr->maxY) {
|
||
dInfoPtr->topOfEof = dInfoPtr->maxY;
|
||
}
|
||
if (bottomY < dInfoPtr->topOfEof) {
|
||
if (tkTextDebug) {
|
||
Tcl_SetVar2(textPtr->interp, "tk_textRedraw",
|
||
(char *) NULL, "eof",
|
||
TCL_GLOBAL_ONLY|TCL_APPEND_VALUE|TCL_LIST_ELEMENT);
|
||
}
|
||
|
||
if (textPtr->tkwin == NULL) {
|
||
|
||
/*
|
||
* The widget has been deleted. Don't do anything.
|
||
*/
|
||
|
||
goto end;
|
||
}
|
||
|
||
Tk_Fill3DRectangle(textPtr->tkwin, Tk_WindowId(textPtr->tkwin),
|
||
textPtr->border, dInfoPtr->x - textPtr->padX, bottomY,
|
||
dInfoPtr->maxX - (dInfoPtr->x - textPtr->padX),
|
||
dInfoPtr->topOfEof-bottomY, 0, TK_RELIEF_FLAT);
|
||
}
|
||
dInfoPtr->topOfEof = bottomY;
|
||
|
||
doScrollbars:
|
||
|
||
/*
|
||
* Update the vertical scrollbar, if there is one. Note: it's
|
||
* important to clear REDRAW_PENDING here, just in case the
|
||
* scroll procedure does something that requires redisplay.
|
||
*/
|
||
|
||
if (textPtr->flags & UPDATE_SCROLLBARS) {
|
||
textPtr->flags &= ~UPDATE_SCROLLBARS;
|
||
if (textPtr->yScrollCmd != NULL) {
|
||
GetYView(textPtr->interp, textPtr, 1);
|
||
}
|
||
|
||
if (textPtr->tkwin == NULL) {
|
||
|
||
/*
|
||
* The widget has been deleted. Don't do anything.
|
||
*/
|
||
|
||
goto end;
|
||
}
|
||
|
||
/*
|
||
* Update the horizontal scrollbar, if any.
|
||
*/
|
||
|
||
if (textPtr->xScrollCmd != NULL) {
|
||
GetXView(textPtr->interp, textPtr, 1);
|
||
}
|
||
}
|
||
|
||
end:
|
||
Tcl_Release((ClientData) interp);
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* TkTextEventuallyRepick --
|
||
*
|
||
* This procedure is invoked whenever something happens that
|
||
* could change the current character or the tags associated
|
||
* with it.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* A repick is scheduled as an idle handler.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
/* ARGSUSED */
|
||
void
|
||
TkTextEventuallyRepick(textPtr)
|
||
TkText *textPtr; /* Widget record for text widget. */
|
||
{
|
||
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
|
||
dInfoPtr->flags |= REPICK_NEEDED;
|
||
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
||
dInfoPtr->flags |= REDRAW_PENDING;
|
||
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* TkTextRedrawRegion --
|
||
*
|
||
* This procedure is invoked to schedule a redisplay for a given
|
||
* region of a text widget. The redisplay itself may not occur
|
||
* immediately: it's scheduled as a when-idle handler.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Information will eventually be redrawn on the screen.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
/* ARGSUSED */
|
||
void
|
||
TkTextRedrawRegion(textPtr, x, y, width, height)
|
||
TkText *textPtr; /* Widget record for text widget. */
|
||
int x, y; /* Coordinates of upper-left corner of area
|
||
* to be redrawn, in pixels relative to
|
||
* textPtr's window. */
|
||
int width, height; /* Width and height of area to be redrawn. */
|
||
{
|
||
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
TkRegion damageRgn = TkCreateRegion();
|
||
XRectangle rect;
|
||
|
||
rect.x = x;
|
||
rect.y = y;
|
||
rect.width = width;
|
||
rect.height = height;
|
||
TkUnionRectWithRegion(&rect, damageRgn, damageRgn);
|
||
|
||
TextInvalidateRegion(textPtr, damageRgn);
|
||
|
||
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
||
dInfoPtr->flags |= REDRAW_PENDING;
|
||
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
||
}
|
||
TkDestroyRegion(damageRgn);
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* TextInvalidateRegion --
|
||
*
|
||
* Mark a region of text as invalid.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Updates the display information for the text widget.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
TextInvalidateRegion(textPtr, region)
|
||
TkText *textPtr; /* Widget record for text widget. */
|
||
TkRegion region; /* Region of area to redraw. */
|
||
{
|
||
register DLine *dlPtr;
|
||
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
int maxY, inset;
|
||
XRectangle rect;
|
||
|
||
/*
|
||
* Find all lines that overlap the given region and mark them for
|
||
* redisplay.
|
||
*/
|
||
|
||
TkClipBox(region, &rect);
|
||
maxY = rect.y + rect.height;
|
||
for (dlPtr = dInfoPtr->dLinePtr; dlPtr != NULL;
|
||
dlPtr = dlPtr->nextPtr) {
|
||
if ((dlPtr->oldY != -1) && (TkRectInRegion(region, rect.x, dlPtr->y,
|
||
rect.width, (unsigned int) dlPtr->height) != RectangleOut)) {
|
||
dlPtr->oldY = -1;
|
||
}
|
||
}
|
||
if (dInfoPtr->topOfEof < maxY) {
|
||
dInfoPtr->topOfEof = maxY;
|
||
}
|
||
|
||
/*
|
||
* Schedule the redisplay operation if there isn't one already
|
||
* scheduled.
|
||
*/
|
||
|
||
inset = textPtr->borderWidth + textPtr->highlightWidth;
|
||
if ((rect.x < (inset + textPtr->padX))
|
||
|| (rect.y < (inset + textPtr->padY))
|
||
|| ((int) (rect.x + rect.width) > (Tk_Width(textPtr->tkwin)
|
||
- inset - textPtr->padX))
|
||
|| (maxY > (Tk_Height(textPtr->tkwin) - inset - textPtr->padY))) {
|
||
dInfoPtr->flags |= REDRAW_BORDERS;
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* TkTextChanged --
|
||
*
|
||
* This procedure is invoked when info in a text widget is about
|
||
* to be modified in a way that changes how it is displayed (e.g.
|
||
* characters were inserted or deleted, or tag information was
|
||
* changed). This procedure must be called *before* a change is
|
||
* made, so that indexes in the display information are still
|
||
* valid.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The range of character between index1Ptr (inclusive) and
|
||
* index2Ptr (exclusive) will be redisplayed at some point in the
|
||
* future (the actual redisplay is scheduled as a when-idle handler).
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
void
|
||
TkTextChanged(textPtr, index1Ptr, index2Ptr)
|
||
TkText *textPtr; /* Widget record for text widget. */
|
||
TkTextIndex *index1Ptr; /* Index of first character to redisplay. */
|
||
TkTextIndex *index2Ptr; /* Index of character just after last one
|
||
* to redisplay. */
|
||
{
|
||
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
DLine *firstPtr, *lastPtr;
|
||
TkTextIndex rounded;
|
||
|
||
/*
|
||
* Schedule both a redisplay and a recomputation of display information.
|
||
* It's done here rather than the end of the procedure for two reasons:
|
||
*
|
||
* 1. If there are no display lines to update we'll want to return
|
||
* immediately, well before the end of the procedure.
|
||
* 2. It's important to arrange for the redisplay BEFORE calling
|
||
* FreeDLines. The reason for this is subtle and has to do with
|
||
* embedded windows. The chunk delete procedure for an embedded
|
||
* window will schedule an idle handler to unmap the window.
|
||
* However, we want the idle handler for redisplay to be called
|
||
* first, so that it can put the embedded window back on the screen
|
||
* again (if appropriate). This will prevent the window from ever
|
||
* being unmapped, and thereby avoid flashing.
|
||
*/
|
||
|
||
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
||
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
||
}
|
||
dInfoPtr->flags |= REDRAW_PENDING|DINFO_OUT_OF_DATE|REPICK_NEEDED;
|
||
|
||
/*
|
||
* Find the DLines corresponding to index1Ptr and index2Ptr. There
|
||
* is one tricky thing here, which is that we have to relayout in
|
||
* units of whole text lines: round index1Ptr back to the beginning
|
||
* of its text line, and include all the display lines after index2,
|
||
* up to the end of its text line. This is necessary because the
|
||
* indices stored in the display lines will no longer be valid. It's
|
||
* also needed because any edit could change the way lines wrap.
|
||
*/
|
||
|
||
rounded = *index1Ptr;
|
||
rounded.charIndex = 0;
|
||
firstPtr = FindDLine(dInfoPtr->dLinePtr, &rounded);
|
||
if (firstPtr == NULL) {
|
||
return;
|
||
}
|
||
lastPtr = FindDLine(dInfoPtr->dLinePtr, index2Ptr);
|
||
while ((lastPtr != NULL)
|
||
&& (lastPtr->index.linePtr == index2Ptr->linePtr)) {
|
||
lastPtr = lastPtr->nextPtr;
|
||
}
|
||
|
||
/*
|
||
* Delete all the DLines from firstPtr up to but not including lastPtr.
|
||
*/
|
||
|
||
FreeDLines(textPtr, firstPtr, lastPtr, 1);
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* TkTextRedrawTag --
|
||
*
|
||
* This procedure is invoked to request a redraw of all characters
|
||
* in a given range that have a particular tag on or off. It's
|
||
* called, for example, when tag options change.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Information on the screen may be redrawn, and the layout of
|
||
* the screen may change.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
void
|
||
TkTextRedrawTag(textPtr, index1Ptr, index2Ptr, tagPtr, withTag)
|
||
TkText *textPtr; /* Widget record for text widget. */
|
||
TkTextIndex *index1Ptr; /* First character in range to consider
|
||
* for redisplay. NULL means start at
|
||
* beginning of text. */
|
||
TkTextIndex *index2Ptr; /* Character just after last one to consider
|
||
* for redisplay. NULL means process all
|
||
* the characters in the text. */
|
||
TkTextTag *tagPtr; /* Information about tag. */
|
||
int withTag; /* 1 means redraw characters that have the
|
||
* tag, 0 means redraw those without. */
|
||
{
|
||
register DLine *dlPtr;
|
||
DLine *endPtr;
|
||
int tagOn;
|
||
TkTextSearch search;
|
||
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
TkTextIndex *curIndexPtr;
|
||
TkTextIndex endOfText, *endIndexPtr;
|
||
|
||
/*
|
||
* Round up the starting position if it's before the first line
|
||
* visible on the screen (we only care about what's on the screen).
|
||
*/
|
||
|
||
dlPtr = dInfoPtr->dLinePtr;
|
||
if (dlPtr == NULL) {
|
||
return;
|
||
}
|
||
if ((index1Ptr == NULL) || (TkTextIndexCmp(&dlPtr->index, index1Ptr) > 0)) {
|
||
index1Ptr = &dlPtr->index;
|
||
}
|
||
|
||
/*
|
||
* Set the stopping position if it wasn't specified.
|
||
*/
|
||
|
||
if (index2Ptr == NULL) {
|
||
index2Ptr = TkTextMakeIndex(textPtr->tree,
|
||
TkBTreeNumLines(textPtr->tree), 0, &endOfText);
|
||
}
|
||
|
||
/*
|
||
* Initialize a search through all transitions on the tag, starting
|
||
* with the first transition where the tag's current state is different
|
||
* from what it will eventually be.
|
||
*/
|
||
|
||
TkBTreeStartSearch(index1Ptr, index2Ptr, tagPtr, &search);
|
||
/*
|
||
* Make our own curIndex because at this point search.curIndex
|
||
* may not equal index1Ptr->curIndex in the case the first tag toggle
|
||
* comes after index1Ptr (See the use of FindTagStart in TkBTreeStartSearch)
|
||
*/
|
||
curIndexPtr = index1Ptr;
|
||
tagOn = TkBTreeCharTagged(index1Ptr, tagPtr);
|
||
if (tagOn != withTag) {
|
||
if (!TkBTreeNextTag(&search)) {
|
||
return;
|
||
}
|
||
curIndexPtr = &search.curIndex;
|
||
}
|
||
|
||
/*
|
||
* Schedule a redisplay and layout recalculation if they aren't
|
||
* already pending. This has to be done before calling FreeDLines,
|
||
* for the reason given in TkTextChanged.
|
||
*/
|
||
|
||
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
||
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
||
}
|
||
dInfoPtr->flags |= REDRAW_PENDING|DINFO_OUT_OF_DATE|REPICK_NEEDED;
|
||
|
||
/*
|
||
* Each loop through the loop below is for one range of characters
|
||
* where the tag's current state is different than its eventual
|
||
* state. At the top of the loop, search contains information about
|
||
* the first character in the range.
|
||
*/
|
||
|
||
while (1) {
|
||
/*
|
||
* Find the first DLine structure in the range. Note: if the
|
||
* desired character isn't the first in its text line, then look
|
||
* for the character just before it instead. This is needed to
|
||
* handle the case where the first character of a wrapped
|
||
* display line just got smaller, so that it now fits on the
|
||
* line before: need to relayout the line containing the
|
||
* previous character.
|
||
*/
|
||
|
||
if (curIndexPtr->charIndex == 0) {
|
||
dlPtr = FindDLine(dlPtr, curIndexPtr);
|
||
} else {
|
||
TkTextIndex tmp;
|
||
|
||
tmp = *curIndexPtr;
|
||
tmp.charIndex -= 1;
|
||
dlPtr = FindDLine(dlPtr, &tmp);
|
||
}
|
||
if (dlPtr == NULL) {
|
||
break;
|
||
}
|
||
|
||
/*
|
||
* Find the first DLine structure that's past the end of the range.
|
||
*/
|
||
|
||
if (!TkBTreeNextTag(&search)) {
|
||
endIndexPtr = index2Ptr;
|
||
} else {
|
||
curIndexPtr = &search.curIndex;
|
||
endIndexPtr = curIndexPtr;
|
||
}
|
||
endPtr = FindDLine(dlPtr, endIndexPtr);
|
||
if ((endPtr != NULL) && (endPtr->index.linePtr == endIndexPtr->linePtr)
|
||
&& (endPtr->index.charIndex < endIndexPtr->charIndex)) {
|
||
endPtr = endPtr->nextPtr;
|
||
}
|
||
|
||
/*
|
||
* Delete all of the display lines in the range, so that they'll
|
||
* be re-layed out and redrawn.
|
||
*/
|
||
|
||
FreeDLines(textPtr, dlPtr, endPtr, 1);
|
||
dlPtr = endPtr;
|
||
|
||
/*
|
||
* Find the first text line in the next range.
|
||
*/
|
||
|
||
if (!TkBTreeNextTag(&search)) {
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* TkTextRelayoutWindow --
|
||
*
|
||
* This procedure is called when something has happened that
|
||
* invalidates the whole layout of characters on the screen, such
|
||
* as a change in a configuration option for the overall text
|
||
* widget or a change in the window size. It causes all display
|
||
* information to be recomputed and the window to be redrawn.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* All the display information will be recomputed for the window
|
||
* and the window will be redrawn.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
void
|
||
TkTextRelayoutWindow(textPtr)
|
||
TkText *textPtr; /* Widget record for text widget. */
|
||
{
|
||
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
GC new;
|
||
XGCValues gcValues;
|
||
|
||
/*
|
||
* Schedule the window redisplay. See TkTextChanged for the
|
||
* reason why this has to be done before any calls to FreeDLines.
|
||
*/
|
||
|
||
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
||
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
||
}
|
||
dInfoPtr->flags |= REDRAW_PENDING|REDRAW_BORDERS|DINFO_OUT_OF_DATE
|
||
|REPICK_NEEDED;
|
||
|
||
/*
|
||
* (Re-)create the graphics context for drawing the traversal
|
||
* highlight.
|
||
*/
|
||
|
||
gcValues.graphics_exposures = False;
|
||
new = Tk_GetGC(textPtr->tkwin, GCGraphicsExposures, &gcValues);
|
||
if (dInfoPtr->copyGC != None) {
|
||
Tk_FreeGC(textPtr->display, dInfoPtr->copyGC);
|
||
}
|
||
dInfoPtr->copyGC = new;
|
||
|
||
/*
|
||
* Throw away all the current layout information.
|
||
*/
|
||
|
||
FreeDLines(textPtr, dInfoPtr->dLinePtr, (DLine *) NULL, 1);
|
||
dInfoPtr->dLinePtr = NULL;
|
||
|
||
/*
|
||
* Recompute some overall things for the layout. Even if the
|
||
* window gets very small, pretend that there's at least one
|
||
* pixel of drawing space in it.
|
||
*/
|
||
|
||
if (textPtr->highlightWidth < 0) {
|
||
textPtr->highlightWidth = 0;
|
||
}
|
||
dInfoPtr->x = textPtr->highlightWidth + textPtr->borderWidth
|
||
+ textPtr->padX;
|
||
dInfoPtr->y = textPtr->highlightWidth + textPtr->borderWidth
|
||
+ textPtr->padY;
|
||
dInfoPtr->maxX = Tk_Width(textPtr->tkwin) - textPtr->highlightWidth
|
||
- textPtr->borderWidth - textPtr->padX;
|
||
if (dInfoPtr->maxX <= dInfoPtr->x) {
|
||
dInfoPtr->maxX = dInfoPtr->x + 1;
|
||
}
|
||
dInfoPtr->maxY = Tk_Height(textPtr->tkwin) - textPtr->highlightWidth
|
||
- textPtr->borderWidth - textPtr->padY;
|
||
if (dInfoPtr->maxY <= dInfoPtr->y) {
|
||
dInfoPtr->maxY = dInfoPtr->y + 1;
|
||
}
|
||
dInfoPtr->topOfEof = dInfoPtr->maxY;
|
||
|
||
/*
|
||
* If the upper-left character isn't the first in a line, recompute
|
||
* it. This is necessary because a change in the window's size
|
||
* or options could change the way lines wrap.
|
||
*/
|
||
|
||
if (textPtr->topIndex.charIndex != 0) {
|
||
MeasureUp(textPtr, &textPtr->topIndex, 0, &textPtr->topIndex);
|
||
}
|
||
|
||
/*
|
||
* Invalidate cached scrollbar positions, so that scrollbars
|
||
* sliders will be udpated.
|
||
*/
|
||
|
||
dInfoPtr->xScrollFirst = dInfoPtr->xScrollLast = -1;
|
||
dInfoPtr->yScrollFirst = dInfoPtr->yScrollLast = -1;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* TkTextSetYView --
|
||
*
|
||
* This procedure is called to specify what lines are to be
|
||
* displayed in a text widget.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The display will (eventually) be updated so that the position
|
||
* given by "indexPtr" is visible on the screen at the position
|
||
* determined by "pickPlace".
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
void
|
||
TkTextSetYView(textPtr, indexPtr, pickPlace)
|
||
TkText *textPtr; /* Widget record for text widget. */
|
||
TkTextIndex *indexPtr; /* Position that is to appear somewhere
|
||
* in the view. */
|
||
int pickPlace; /* 0 means topLine must appear at top of
|
||
* screen. 1 means we get to pick where it
|
||
* appears: minimize screen motion or else
|
||
* display line at center of screen. */
|
||
{
|
||
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
register DLine *dlPtr;
|
||
int bottomY, close, lineIndex;
|
||
TkTextIndex tmpIndex, rounded;
|
||
Tk_FontMetrics fm;
|
||
|
||
/*
|
||
* If the specified position is the extra line at the end of the
|
||
* text, round it back to the last real line.
|
||
*/
|
||
|
||
lineIndex = TkBTreeLineIndex(indexPtr->linePtr);
|
||
if (lineIndex == TkBTreeNumLines(indexPtr->tree)) {
|
||
TkTextIndexBackChars(indexPtr, 1, &rounded);
|
||
indexPtr = &rounded;
|
||
}
|
||
|
||
if (!pickPlace) {
|
||
/*
|
||
* The specified position must go at the top of the screen.
|
||
* Just leave all the DLine's alone: we may be able to reuse
|
||
* some of the information that's currently on the screen
|
||
* without redisplaying it all.
|
||
*/
|
||
|
||
if (indexPtr->charIndex == 0) {
|
||
textPtr->topIndex = *indexPtr;
|
||
} else {
|
||
MeasureUp(textPtr, indexPtr, 0, &textPtr->topIndex);
|
||
}
|
||
goto scheduleUpdate;
|
||
}
|
||
|
||
/*
|
||
* We have to pick where to display the index. First, bring
|
||
* the display information up to date and see if the index will be
|
||
* completely visible in the current screen configuration. If so
|
||
* then there's nothing to do.
|
||
*/
|
||
|
||
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
|
||
UpdateDisplayInfo(textPtr);
|
||
}
|
||
dlPtr = FindDLine(dInfoPtr->dLinePtr, indexPtr);
|
||
if (dlPtr != NULL) {
|
||
if ((dlPtr->y + dlPtr->height) > dInfoPtr->maxY) {
|
||
/*
|
||
* Part of the line hangs off the bottom of the screen;
|
||
* pretend the whole line is off-screen.
|
||
*/
|
||
|
||
dlPtr = NULL;
|
||
} else if ((dlPtr->index.linePtr == indexPtr->linePtr)
|
||
&& (dlPtr->index.charIndex <= indexPtr->charIndex)) {
|
||
return;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* The desired line isn't already on-screen. Figure out what
|
||
* it means to be "close" to the top or bottom of the screen.
|
||
* Close means within 1/3 of the screen height or within three
|
||
* lines, whichever is greater. Add one extra line also, to
|
||
* account for the way MeasureUp rounds.
|
||
*/
|
||
|
||
Tk_GetFontMetrics(textPtr->tkfont, &fm);
|
||
bottomY = (dInfoPtr->y + dInfoPtr->maxY + fm.linespace)/2;
|
||
close = (dInfoPtr->maxY - dInfoPtr->y)/3;
|
||
if (close < 3*fm.linespace) {
|
||
close = 3*fm.linespace;
|
||
}
|
||
close += fm.linespace;
|
||
if (dlPtr != NULL) {
|
||
/*
|
||
* The desired line is above the top of screen. If it is
|
||
* "close" to the top of the window then make it the top
|
||
* line on the screen.
|
||
*/
|
||
|
||
MeasureUp(textPtr, &textPtr->topIndex, close, &tmpIndex);
|
||
if (TkTextIndexCmp(&tmpIndex, indexPtr) <= 0) {
|
||
MeasureUp(textPtr, indexPtr, 0, &textPtr->topIndex);
|
||
goto scheduleUpdate;
|
||
}
|
||
} else {
|
||
/*
|
||
* The desired line is below the bottom of the screen. If it is
|
||
* "close" to the bottom of the screen then position it at the
|
||
* bottom of the screen.
|
||
*/
|
||
|
||
MeasureUp(textPtr, indexPtr, close, &tmpIndex);
|
||
if (FindDLine(dInfoPtr->dLinePtr, &tmpIndex) != NULL) {
|
||
bottomY = dInfoPtr->maxY - dInfoPtr->y;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Our job now is to arrange the display so that indexPtr appears
|
||
* as low on the screen as possible but with its bottom no lower
|
||
* than bottomY. BottomY is the bottom of the window if the
|
||
* desired line is just below the current screen, otherwise it
|
||
* is a half-line lower than the center of the window.
|
||
*/
|
||
|
||
MeasureUp(textPtr, indexPtr, bottomY, &textPtr->topIndex);
|
||
|
||
scheduleUpdate:
|
||
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
||
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
||
}
|
||
dInfoPtr->flags |= REDRAW_PENDING|DINFO_OUT_OF_DATE|REPICK_NEEDED;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* MeasureUp --
|
||
*
|
||
* Given one index, find the index of the first character
|
||
* on the highest display line that would be displayed no more
|
||
* than "distance" pixels above the given index.
|
||
*
|
||
* Results:
|
||
* *dstPtr is filled in with the index of the first character
|
||
* on a display line. The display line is found by measuring
|
||
* up "distance" pixels above the pixel just below an imaginary
|
||
* display line that contains srcPtr. If the display line
|
||
* that covers this coordinate actually extends above the
|
||
* coordinate, then return the index of the next lower line
|
||
* instead (i.e. the returned index will be completely visible
|
||
* at or below the given y-coordinate).
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
MeasureUp(textPtr, srcPtr, distance, dstPtr)
|
||
TkText *textPtr; /* Text widget in which to measure. */
|
||
TkTextIndex *srcPtr; /* Index of character from which to start
|
||
* measuring. */
|
||
int distance; /* Vertical distance in pixels measured
|
||
* from the pixel just below the lowest
|
||
* one in srcPtr's line. */
|
||
TkTextIndex *dstPtr; /* Index to fill in with result. */
|
||
{
|
||
int lineNum; /* Number of current line. */
|
||
int charsToCount; /* Maximum number of characters to measure
|
||
* in current line. */
|
||
TkTextIndex bestIndex; /* Best candidate seen so far for result. */
|
||
TkTextIndex index;
|
||
DLine *dlPtr, *lowestPtr;
|
||
int noBestYet; /* 1 means bestIndex hasn't been set. */
|
||
|
||
noBestYet = 1;
|
||
charsToCount = srcPtr->charIndex + 1;
|
||
index.tree = srcPtr->tree;
|
||
for (lineNum = TkBTreeLineIndex(srcPtr->linePtr); lineNum >= 0;
|
||
lineNum--) {
|
||
/*
|
||
* Layout an entire text line (potentially > 1 display line).
|
||
* For the first line, which contains srcPtr, only layout the
|
||
* part up through srcPtr (charsToCount is non-infinite to
|
||
* accomplish this). Make a list of all the display lines
|
||
* in backwards order (the lowest DLine on the screen is first
|
||
* in the list).
|
||
*/
|
||
|
||
index.linePtr = TkBTreeFindLine(srcPtr->tree, lineNum);
|
||
index.charIndex = 0;
|
||
lowestPtr = NULL;
|
||
do {
|
||
dlPtr = LayoutDLine(textPtr, &index);
|
||
dlPtr->nextPtr = lowestPtr;
|
||
lowestPtr = dlPtr;
|
||
TkTextIndexForwChars(&index, dlPtr->count, &index);
|
||
charsToCount -= dlPtr->count;
|
||
} while ((charsToCount > 0) && (index.linePtr == dlPtr->index.linePtr));
|
||
|
||
/*
|
||
* Scan through the display lines to see if we've covered enough
|
||
* vertical distance. If so, save the starting index for the
|
||
* line at the desired location.
|
||
*/
|
||
|
||
for (dlPtr = lowestPtr; dlPtr != NULL; dlPtr = dlPtr->nextPtr) {
|
||
distance -= dlPtr->height;
|
||
if (distance < 0) {
|
||
*dstPtr = (noBestYet) ? dlPtr->index : bestIndex;
|
||
break;
|
||
}
|
||
bestIndex = dlPtr->index;
|
||
noBestYet = 0;
|
||
}
|
||
|
||
/*
|
||
* Discard the display lines, then either return or prepare
|
||
* for the next display line to lay out.
|
||
*/
|
||
|
||
FreeDLines(textPtr, lowestPtr, (DLine *) NULL, 0);
|
||
if (distance < 0) {
|
||
return;
|
||
}
|
||
charsToCount = INT_MAX; /* Consider all chars. in next line. */
|
||
}
|
||
|
||
/*
|
||
* Ran off the beginning of the text. Return the first character
|
||
* in the text.
|
||
*/
|
||
|
||
TkTextMakeIndex(textPtr->tree, 0, 0, dstPtr);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* TkTextSeeCmd --
|
||
*
|
||
* This procedure is invoked to process the "see" option for
|
||
* the widget command for text widgets. See the user documentation
|
||
* for details on what it does.
|
||
*
|
||
* Results:
|
||
* A standard Tcl result.
|
||
*
|
||
* Side effects:
|
||
* See the user documentation.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
int
|
||
TkTextSeeCmd(textPtr, interp, argc, argv)
|
||
TkText *textPtr; /* Information about text widget. */
|
||
Tcl_Interp *interp; /* Current interpreter. */
|
||
int argc; /* Number of arguments. */
|
||
char **argv; /* Argument strings. Someone else has already
|
||
* parsed this command enough to know that
|
||
* argv[1] is "see". */
|
||
{
|
||
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
TkTextIndex index;
|
||
int x, y, width, height, lineWidth, charCount, oneThird, delta;
|
||
DLine *dlPtr;
|
||
TkTextDispChunk *chunkPtr;
|
||
|
||
if (argc != 3) {
|
||
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
||
argv[0], " see index\"", (char *) NULL);
|
||
return TCL_ERROR;
|
||
}
|
||
if (TkTextGetIndex(interp, textPtr, argv[2], &index) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
/*
|
||
* If the specified position is the extra line at the end of the
|
||
* text, round it back to the last real line.
|
||
*/
|
||
|
||
if (TkBTreeLineIndex(index.linePtr) == TkBTreeNumLines(index.tree)) {
|
||
TkTextIndexBackChars(&index, 1, &index);
|
||
}
|
||
|
||
/*
|
||
* First get the desired position into the vertical range of the window.
|
||
*/
|
||
|
||
TkTextSetYView(textPtr, &index, 1);
|
||
|
||
/*
|
||
* Now make sure that the character is in view horizontally.
|
||
*/
|
||
|
||
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
|
||
UpdateDisplayInfo(textPtr);
|
||
}
|
||
lineWidth = dInfoPtr->maxX - dInfoPtr->x;
|
||
if (dInfoPtr->maxLength < lineWidth) {
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
* Find the chunk that contains the desired index.
|
||
*/
|
||
|
||
dlPtr = FindDLine(dInfoPtr->dLinePtr, &index);
|
||
charCount = index.charIndex - dlPtr->index.charIndex;
|
||
for (chunkPtr = dlPtr->chunkPtr; ; chunkPtr = chunkPtr->nextPtr) {
|
||
if (charCount < chunkPtr->numChars) {
|
||
break;
|
||
}
|
||
charCount -= chunkPtr->numChars;
|
||
}
|
||
|
||
/*
|
||
* Call a chunk-specific procedure to find the horizontal range of
|
||
* the character within the chunk.
|
||
*/
|
||
|
||
(*chunkPtr->bboxProc)(chunkPtr, charCount, dlPtr->y + dlPtr->spaceAbove,
|
||
dlPtr->height - dlPtr->spaceAbove - dlPtr->spaceBelow,
|
||
dlPtr->baseline - dlPtr->spaceAbove, &x, &y, &width,
|
||
&height);
|
||
delta = x - dInfoPtr->curPixelOffset;
|
||
oneThird = lineWidth/3;
|
||
if (delta < 0) {
|
||
if (delta < -oneThird) {
|
||
dInfoPtr->newCharOffset = (x - lineWidth/2)/textPtr->charWidth;
|
||
} else {
|
||
dInfoPtr->newCharOffset -= ((-delta) + textPtr->charWidth - 1)
|
||
/ textPtr->charWidth;
|
||
}
|
||
} else {
|
||
delta -= (lineWidth - width);
|
||
if (delta > 0) {
|
||
if (delta > oneThird) {
|
||
dInfoPtr->newCharOffset = (x - lineWidth/2)/textPtr->charWidth;
|
||
} else {
|
||
dInfoPtr->newCharOffset += (delta + textPtr->charWidth - 1)
|
||
/ textPtr->charWidth;
|
||
}
|
||
} else {
|
||
return TCL_OK;
|
||
}
|
||
}
|
||
dInfoPtr->flags |= DINFO_OUT_OF_DATE;
|
||
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
||
dInfoPtr->flags |= REDRAW_PENDING;
|
||
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
||
}
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* TkTextXviewCmd --
|
||
*
|
||
* This procedure is invoked to process the "xview" option for
|
||
* the widget command for text widgets. See the user documentation
|
||
* for details on what it does.
|
||
*
|
||
* Results:
|
||
* A standard Tcl result.
|
||
*
|
||
* Side effects:
|
||
* See the user documentation.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
int
|
||
TkTextXviewCmd(textPtr, interp, argc, argv)
|
||
TkText *textPtr; /* Information about text widget. */
|
||
Tcl_Interp *interp; /* Current interpreter. */
|
||
int argc; /* Number of arguments. */
|
||
char **argv; /* Argument strings. Someone else has already
|
||
* parsed this command enough to know that
|
||
* argv[1] is "xview". */
|
||
{
|
||
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
int type, charsPerPage, count, newOffset;
|
||
double fraction;
|
||
|
||
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
|
||
UpdateDisplayInfo(textPtr);
|
||
}
|
||
|
||
if (argc == 2) {
|
||
GetXView(interp, textPtr, 0);
|
||
return TCL_OK;
|
||
}
|
||
|
||
newOffset = dInfoPtr->newCharOffset;
|
||
type = Tk_GetScrollInfo(interp, argc, argv, &fraction, &count);
|
||
switch (type) {
|
||
case TK_SCROLL_ERROR:
|
||
return TCL_ERROR;
|
||
case TK_SCROLL_MOVETO:
|
||
if (fraction > 1.0) {
|
||
fraction = 1.0;
|
||
}
|
||
if (fraction < 0) {
|
||
fraction = 0;
|
||
}
|
||
newOffset = (int) (((fraction * dInfoPtr->maxLength) / textPtr->charWidth)
|
||
+ 0.5);
|
||
break;
|
||
case TK_SCROLL_PAGES:
|
||
charsPerPage = ((dInfoPtr->maxX - dInfoPtr->x) / textPtr->charWidth)
|
||
- 2;
|
||
if (charsPerPage < 1) {
|
||
charsPerPage = 1;
|
||
}
|
||
newOffset += charsPerPage*count;
|
||
break;
|
||
case TK_SCROLL_UNITS:
|
||
newOffset += count;
|
||
break;
|
||
}
|
||
|
||
dInfoPtr->newCharOffset = newOffset;
|
||
dInfoPtr->flags |= DINFO_OUT_OF_DATE;
|
||
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
||
dInfoPtr->flags |= REDRAW_PENDING;
|
||
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
||
}
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* ScrollByLines --
|
||
*
|
||
* This procedure is called to scroll a text widget up or down
|
||
* by a given number of lines.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The view in textPtr's window changes to reflect the value
|
||
* of "offset".
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
ScrollByLines(textPtr, offset)
|
||
TkText *textPtr; /* Widget to scroll. */
|
||
int offset; /* Amount by which to scroll, in *screen*
|
||
* lines. Positive means that information
|
||
* later in text becomes visible, negative
|
||
* means that information earlier in the
|
||
* text becomes visible. */
|
||
{
|
||
int i, charsToCount, lineNum;
|
||
TkTextIndex new, index;
|
||
TkTextLine *lastLinePtr;
|
||
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
DLine *dlPtr, *lowestPtr;
|
||
|
||
if (offset < 0) {
|
||
/*
|
||
* Must scroll up (to show earlier information in the text).
|
||
* The code below is similar to that in MeasureUp, except that
|
||
* it counts lines instead of pixels.
|
||
*/
|
||
|
||
charsToCount = textPtr->topIndex.charIndex + 1;
|
||
index.tree = textPtr->tree;
|
||
offset--; /* Skip line containing topIndex. */
|
||
for (lineNum = TkBTreeLineIndex(textPtr->topIndex.linePtr);
|
||
lineNum >= 0; lineNum--) {
|
||
index.linePtr = TkBTreeFindLine(textPtr->tree, lineNum);
|
||
index.charIndex = 0;
|
||
lowestPtr = NULL;
|
||
do {
|
||
dlPtr = LayoutDLine(textPtr, &index);
|
||
dlPtr->nextPtr = lowestPtr;
|
||
lowestPtr = dlPtr;
|
||
TkTextIndexForwChars(&index, dlPtr->count, &index);
|
||
charsToCount -= dlPtr->count;
|
||
} while ((charsToCount > 0)
|
||
&& (index.linePtr == dlPtr->index.linePtr));
|
||
|
||
for (dlPtr = lowestPtr; dlPtr != NULL; dlPtr = dlPtr->nextPtr) {
|
||
offset++;
|
||
if (offset == 0) {
|
||
textPtr->topIndex = dlPtr->index;
|
||
break;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Discard the display lines, then either return or prepare
|
||
* for the next display line to lay out.
|
||
*/
|
||
|
||
FreeDLines(textPtr, lowestPtr, (DLine *) NULL, 0);
|
||
if (offset >= 0) {
|
||
goto scheduleUpdate;
|
||
}
|
||
charsToCount = INT_MAX;
|
||
}
|
||
|
||
/*
|
||
* Ran off the beginning of the text. Return the first character
|
||
* in the text.
|
||
*/
|
||
|
||
TkTextMakeIndex(textPtr->tree, 0, 0, &textPtr->topIndex);
|
||
} else {
|
||
/*
|
||
* Scrolling down, to show later information in the text.
|
||
* Just count lines from the current top of the window.
|
||
*/
|
||
|
||
lastLinePtr = TkBTreeFindLine(textPtr->tree,
|
||
TkBTreeNumLines(textPtr->tree));
|
||
for (i = 0; i < offset; i++) {
|
||
dlPtr = LayoutDLine(textPtr, &textPtr->topIndex);
|
||
dlPtr->nextPtr = NULL;
|
||
TkTextIndexForwChars(&textPtr->topIndex, dlPtr->count, &new);
|
||
FreeDLines(textPtr, dlPtr, (DLine *) NULL, 0);
|
||
if (new.linePtr == lastLinePtr) {
|
||
break;
|
||
}
|
||
textPtr->topIndex = new;
|
||
}
|
||
}
|
||
|
||
scheduleUpdate:
|
||
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
||
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
||
}
|
||
dInfoPtr->flags |= REDRAW_PENDING|DINFO_OUT_OF_DATE|REPICK_NEEDED;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* TkTextYviewCmd --
|
||
*
|
||
* This procedure is invoked to process the "yview" option for
|
||
* the widget command for text widgets. See the user documentation
|
||
* for details on what it does.
|
||
*
|
||
* Results:
|
||
* A standard Tcl result.
|
||
*
|
||
* Side effects:
|
||
* See the user documentation.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
int
|
||
TkTextYviewCmd(textPtr, interp, argc, argv)
|
||
TkText *textPtr; /* Information about text widget. */
|
||
Tcl_Interp *interp; /* Current interpreter. */
|
||
int argc; /* Number of arguments. */
|
||
char **argv; /* Argument strings. Someone else has already
|
||
* parsed this command enough to know that
|
||
* argv[1] is "yview". */
|
||
{
|
||
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
int pickPlace, lineNum, type, charsInLine;
|
||
Tk_FontMetrics fm;
|
||
int pixels, count;
|
||
size_t switchLength;
|
||
double fraction;
|
||
TkTextIndex index, new;
|
||
TkTextLine *lastLinePtr;
|
||
DLine *dlPtr;
|
||
|
||
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
|
||
UpdateDisplayInfo(textPtr);
|
||
}
|
||
|
||
if (argc == 2) {
|
||
GetYView(interp, textPtr, 0);
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
* Next, handle the old syntax: "pathName yview ?-pickplace? where"
|
||
*/
|
||
|
||
pickPlace = 0;
|
||
if (argv[2][0] == '-') {
|
||
switchLength = strlen(argv[2]);
|
||
if ((switchLength >= 2)
|
||
&& (strncmp(argv[2], "-pickplace", switchLength) == 0)) {
|
||
pickPlace = 1;
|
||
if (argc != 4) {
|
||
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
||
argv[0], " yview -pickplace lineNum|index\"",
|
||
(char *) NULL);
|
||
return TCL_ERROR;
|
||
}
|
||
}
|
||
}
|
||
if ((argc == 3) || pickPlace) {
|
||
if (Tcl_GetInt(interp, argv[2+pickPlace], &lineNum) == TCL_OK) {
|
||
TkTextMakeIndex(textPtr->tree, lineNum, 0, &index);
|
||
TkTextSetYView(textPtr, &index, 0);
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
* The argument must be a regular text index.
|
||
*/
|
||
|
||
Tcl_ResetResult(interp);
|
||
if (TkTextGetIndex(interp, textPtr, argv[2+pickPlace],
|
||
&index) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
TkTextSetYView(textPtr, &index, pickPlace);
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
* New syntax: dispatch based on argv[2].
|
||
*/
|
||
|
||
type = Tk_GetScrollInfo(interp, argc, argv, &fraction, &count);
|
||
switch (type) {
|
||
case TK_SCROLL_ERROR:
|
||
return TCL_ERROR;
|
||
case TK_SCROLL_MOVETO:
|
||
if (fraction > 1.0) {
|
||
fraction = 1.0;
|
||
}
|
||
if (fraction < 0) {
|
||
fraction = 0;
|
||
}
|
||
fraction *= TkBTreeNumLines(textPtr->tree);
|
||
lineNum = (int) fraction;
|
||
TkTextMakeIndex(textPtr->tree, lineNum, 0, &index);
|
||
charsInLine = TkBTreeCharsInLine(index.linePtr);
|
||
index.charIndex = (int)((charsInLine * (fraction-lineNum)) + 0.5);
|
||
if (index.charIndex >= charsInLine) {
|
||
TkTextMakeIndex(textPtr->tree, lineNum+1, 0, &index);
|
||
}
|
||
TkTextSetYView(textPtr, &index, 0);
|
||
break;
|
||
case TK_SCROLL_PAGES:
|
||
/*
|
||
* Scroll up or down by screenfuls. Actually, use the
|
||
* window height minus two lines, so that there's some
|
||
* overlap between adjacent pages.
|
||
*/
|
||
|
||
Tk_GetFontMetrics(textPtr->tkfont, &fm);
|
||
if (count < 0) {
|
||
pixels = (dInfoPtr->maxY - 2*fm.linespace - dInfoPtr->y)*(-count)
|
||
+ fm.linespace;
|
||
MeasureUp(textPtr, &textPtr->topIndex, pixels, &new);
|
||
if (TkTextIndexCmp(&textPtr->topIndex, &new) == 0) {
|
||
/*
|
||
* A page of scrolling ended up being less than one line.
|
||
* Scroll one line anyway.
|
||
*/
|
||
|
||
count = -1;
|
||
goto scrollByLines;
|
||
}
|
||
textPtr->topIndex = new;
|
||
} else {
|
||
/*
|
||
* Scrolling down by pages. Layout lines starting at the
|
||
* top index and count through the desired vertical distance.
|
||
*/
|
||
|
||
pixels = (dInfoPtr->maxY - 2*fm.linespace - dInfoPtr->y)*count;
|
||
lastLinePtr = TkBTreeFindLine(textPtr->tree,
|
||
TkBTreeNumLines(textPtr->tree));
|
||
do {
|
||
dlPtr = LayoutDLine(textPtr, &textPtr->topIndex);
|
||
dlPtr->nextPtr = NULL;
|
||
TkTextIndexForwChars(&textPtr->topIndex, dlPtr->count,
|
||
&new);
|
||
pixels -= dlPtr->height;
|
||
FreeDLines(textPtr, dlPtr, (DLine *) NULL, 0);
|
||
if (new.linePtr == lastLinePtr) {
|
||
break;
|
||
}
|
||
textPtr->topIndex = new;
|
||
} while (pixels > 0);
|
||
}
|
||
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
||
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
||
}
|
||
dInfoPtr->flags |= REDRAW_PENDING|DINFO_OUT_OF_DATE|REPICK_NEEDED;
|
||
break;
|
||
case TK_SCROLL_UNITS:
|
||
scrollByLines:
|
||
ScrollByLines(textPtr, count);
|
||
break;
|
||
}
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* TkTextScanCmd --
|
||
*
|
||
* This procedure is invoked to process the "scan" option for
|
||
* the widget command for text widgets. See the user documentation
|
||
* for details on what it does.
|
||
*
|
||
* Results:
|
||
* A standard Tcl result.
|
||
*
|
||
* Side effects:
|
||
* See the user documentation.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
int
|
||
TkTextScanCmd(textPtr, interp, argc, argv)
|
||
register TkText *textPtr; /* Information about text widget. */
|
||
Tcl_Interp *interp; /* Current interpreter. */
|
||
int argc; /* Number of arguments. */
|
||
char **argv; /* Argument strings. Someone else has already
|
||
* parsed this command enough to know that
|
||
* argv[1] is "scan". */
|
||
{
|
||
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
TkTextIndex index;
|
||
int c, x, y, totalScroll, newChar, maxChar;
|
||
Tk_FontMetrics fm;
|
||
size_t length;
|
||
|
||
if (argc != 5) {
|
||
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
||
argv[0], " scan mark|dragto x y\"", (char *) NULL);
|
||
return TCL_ERROR;
|
||
}
|
||
if (Tcl_GetInt(interp, argv[3], &x) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
if (Tcl_GetInt(interp, argv[4], &y) != TCL_OK) {
|
||
return TCL_ERROR;
|
||
}
|
||
c = argv[2][0];
|
||
length = strlen(argv[2]);
|
||
if ((c == 'd') && (strncmp(argv[2], "dragto", length) == 0)) {
|
||
/*
|
||
* Amplify the difference between the current position and the
|
||
* mark position to compute how much the view should shift, then
|
||
* update the mark position to correspond to the new view. If we
|
||
* run off the edge of the text, reset the mark point so that the
|
||
* current position continues to correspond to the edge of the
|
||
* window. This means that the picture will start dragging as
|
||
* soon as the mouse reverses direction (without this reset, might
|
||
* have to slide mouse a long ways back before the picture starts
|
||
* moving again).
|
||
*/
|
||
|
||
newChar = dInfoPtr->scanMarkChar + (10*(dInfoPtr->scanMarkX - x))
|
||
/ (textPtr->charWidth);
|
||
maxChar = 1 + (dInfoPtr->maxLength - (dInfoPtr->maxX - dInfoPtr->x)
|
||
+ textPtr->charWidth - 1)/textPtr->charWidth;
|
||
if (newChar < 0) {
|
||
dInfoPtr->scanMarkChar = newChar = 0;
|
||
dInfoPtr->scanMarkX = x;
|
||
} else if (newChar > maxChar) {
|
||
dInfoPtr->scanMarkChar = newChar = maxChar;
|
||
dInfoPtr->scanMarkX = x;
|
||
}
|
||
dInfoPtr->newCharOffset = newChar;
|
||
|
||
Tk_GetFontMetrics(textPtr->tkfont, &fm);
|
||
totalScroll = (10*(dInfoPtr->scanMarkY - y)) / fm.linespace;
|
||
if (totalScroll != dInfoPtr->scanTotalScroll) {
|
||
index = textPtr->topIndex;
|
||
ScrollByLines(textPtr, totalScroll-dInfoPtr->scanTotalScroll);
|
||
dInfoPtr->scanTotalScroll = totalScroll;
|
||
if ((index.linePtr == textPtr->topIndex.linePtr) &&
|
||
(index.charIndex == textPtr->topIndex.charIndex)) {
|
||
dInfoPtr->scanTotalScroll = 0;
|
||
dInfoPtr->scanMarkY = y;
|
||
}
|
||
}
|
||
} else if ((c == 'm') && (strncmp(argv[2], "mark", length) == 0)) {
|
||
dInfoPtr->scanMarkChar = dInfoPtr->newCharOffset;
|
||
dInfoPtr->scanMarkX = x;
|
||
dInfoPtr->scanTotalScroll = 0;
|
||
dInfoPtr->scanMarkY = y;
|
||
} else {
|
||
Tcl_AppendResult(interp, "bad scan option \"", argv[2],
|
||
"\": must be mark or dragto", (char *) NULL);
|
||
return TCL_ERROR;
|
||
}
|
||
dInfoPtr->flags |= DINFO_OUT_OF_DATE;
|
||
if (!(dInfoPtr->flags & REDRAW_PENDING)) {
|
||
dInfoPtr->flags |= REDRAW_PENDING;
|
||
Tcl_DoWhenIdle(DisplayText, (ClientData) textPtr);
|
||
}
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* GetXView --
|
||
*
|
||
* This procedure computes the fractions that indicate what's
|
||
* visible in a text window and, optionally, evaluates a
|
||
* Tcl script to report them to the text's associated scrollbar.
|
||
*
|
||
* Results:
|
||
* If report is zero, then interp->result is filled in with
|
||
* two real numbers separated by a space, giving the position of
|
||
* the left and right edges of the window as fractions from 0 to
|
||
* 1, where 0 means the left edge of the text and 1 means the right
|
||
* edge. If report is non-zero, then interp->result isn't modified
|
||
* directly, but instead a script is evaluated in interp to report
|
||
* the new horizontal scroll position to the scrollbar (if the scroll
|
||
* position hasn't changed then no script is invoked).
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
GetXView(interp, textPtr, report)
|
||
Tcl_Interp *interp; /* If "report" is FALSE, string
|
||
* describing visible range gets
|
||
* stored in interp->result. */
|
||
TkText *textPtr; /* Information about text widget. */
|
||
int report; /* Non-zero means report info to
|
||
* scrollbar if it has changed. */
|
||
{
|
||
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
char buffer[200];
|
||
double first, last;
|
||
int code;
|
||
|
||
if (dInfoPtr->maxLength > 0) {
|
||
first = ((double) dInfoPtr->curPixelOffset)
|
||
/ dInfoPtr->maxLength;
|
||
last = first + ((double) (dInfoPtr->maxX - dInfoPtr->x))
|
||
/ dInfoPtr->maxLength;
|
||
if (last > 1.0) {
|
||
last = 1.0;
|
||
}
|
||
} else {
|
||
first = 0;
|
||
last = 1.0;
|
||
}
|
||
if (!report) {
|
||
sprintf(interp->result, "%g %g", first, last);
|
||
return;
|
||
}
|
||
if ((first == dInfoPtr->xScrollFirst) && (last == dInfoPtr->xScrollLast)) {
|
||
return;
|
||
}
|
||
dInfoPtr->xScrollFirst = first;
|
||
dInfoPtr->xScrollLast = last;
|
||
sprintf(buffer, " %g %g", first, last);
|
||
code = Tcl_VarEval(interp, textPtr->xScrollCmd,
|
||
buffer, (char *) NULL);
|
||
if (code != TCL_OK) {
|
||
Tcl_AddErrorInfo(interp,
|
||
"\n (horizontal scrolling command executed by text)");
|
||
Tcl_BackgroundError(interp);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* GetYView --
|
||
*
|
||
* This procedure computes the fractions that indicate what's
|
||
* visible in a text window and, optionally, evaluates a
|
||
* Tcl script to report them to the text's associated scrollbar.
|
||
*
|
||
* Results:
|
||
* If report is zero, then interp->result is filled in with
|
||
* two real numbers separated by a space, giving the position of
|
||
* the top and bottom of the window as fractions from 0 to 1, where
|
||
* 0 means the beginning of the text and 1 means the end. If
|
||
* report is non-zero, then interp->result isn't modified directly,
|
||
* but a script is evaluated in interp to report the new scroll
|
||
* position to the scrollbar (if the scroll position hasn't changed
|
||
* then no script is invoked).
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
GetYView(interp, textPtr, report)
|
||
Tcl_Interp *interp; /* If "report" is FALSE, string
|
||
* describing visible range gets
|
||
* stored in interp->result. */
|
||
TkText *textPtr; /* Information about text widget. */
|
||
int report; /* Non-zero means report info to
|
||
* scrollbar if it has changed. */
|
||
{
|
||
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
char buffer[200];
|
||
double first, last;
|
||
DLine *dlPtr;
|
||
int totalLines, code, count;
|
||
|
||
dlPtr = dInfoPtr->dLinePtr;
|
||
totalLines = TkBTreeNumLines(textPtr->tree);
|
||
first = ((double) TkBTreeLineIndex(dlPtr->index.linePtr))
|
||
+ ((double) dlPtr->index.charIndex)
|
||
/ (TkBTreeCharsInLine(dlPtr->index.linePtr));
|
||
first /= totalLines;
|
||
while (1) {
|
||
if ((dlPtr->y + dlPtr->height) > dInfoPtr->maxY) {
|
||
/*
|
||
* The last line is only partially visible, so don't
|
||
* count its characters in what's visible.
|
||
*/
|
||
count = 0;
|
||
break;
|
||
}
|
||
if (dlPtr->nextPtr == NULL) {
|
||
count = dlPtr->count;
|
||
break;
|
||
}
|
||
dlPtr = dlPtr->nextPtr;
|
||
}
|
||
last = ((double) TkBTreeLineIndex(dlPtr->index.linePtr))
|
||
+ ((double) (dlPtr->index.charIndex + count))
|
||
/ (TkBTreeCharsInLine(dlPtr->index.linePtr));
|
||
last /= totalLines;
|
||
if (!report) {
|
||
sprintf(interp->result, "%g %g", first, last);
|
||
return;
|
||
}
|
||
if ((first == dInfoPtr->yScrollFirst) && (last == dInfoPtr->yScrollLast)) {
|
||
return;
|
||
}
|
||
dInfoPtr->yScrollFirst = first;
|
||
dInfoPtr->yScrollLast = last;
|
||
sprintf(buffer, " %g %g", first, last);
|
||
code = Tcl_VarEval(interp, textPtr->yScrollCmd,
|
||
buffer, (char *) NULL);
|
||
if (code != TCL_OK) {
|
||
Tcl_AddErrorInfo(interp,
|
||
"\n (vertical scrolling command executed by text)");
|
||
Tcl_BackgroundError(interp);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* FindDLine --
|
||
*
|
||
* This procedure is called to find the DLine corresponding to a
|
||
* given text index.
|
||
*
|
||
* Results:
|
||
* The return value is a pointer to the first DLine found in the
|
||
* list headed by dlPtr that displays information at or after the
|
||
* specified position. If there is no such line in the list then
|
||
* NULL is returned.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static DLine *
|
||
FindDLine(dlPtr, indexPtr)
|
||
register DLine *dlPtr; /* Pointer to first in list of DLines
|
||
* to search. */
|
||
TkTextIndex *indexPtr; /* Index of desired character. */
|
||
{
|
||
TkTextLine *linePtr;
|
||
|
||
if (dlPtr == NULL) {
|
||
return NULL;
|
||
}
|
||
if (TkBTreeLineIndex(indexPtr->linePtr)
|
||
< TkBTreeLineIndex(dlPtr->index.linePtr)) {
|
||
/*
|
||
* The first display line is already past the desired line.
|
||
*/
|
||
return dlPtr;
|
||
}
|
||
|
||
/*
|
||
* Find the first display line that covers the desired text line.
|
||
*/
|
||
|
||
linePtr = dlPtr->index.linePtr;
|
||
while (linePtr != indexPtr->linePtr) {
|
||
while (dlPtr->index.linePtr == linePtr) {
|
||
dlPtr = dlPtr->nextPtr;
|
||
if (dlPtr == NULL) {
|
||
return NULL;
|
||
}
|
||
}
|
||
linePtr = TkBTreeNextLine(linePtr);
|
||
if (linePtr == NULL) {
|
||
panic("FindDLine reached end of text");
|
||
}
|
||
}
|
||
if (indexPtr->linePtr != dlPtr->index.linePtr) {
|
||
return dlPtr;
|
||
}
|
||
|
||
/*
|
||
* Now get to the right position within the text line.
|
||
*/
|
||
|
||
while (indexPtr->charIndex >= (dlPtr->index.charIndex + dlPtr->count)) {
|
||
dlPtr = dlPtr->nextPtr;
|
||
if ((dlPtr == NULL) || (dlPtr->index.linePtr != indexPtr->linePtr)) {
|
||
break;
|
||
}
|
||
}
|
||
return dlPtr;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* TkTextPixelIndex --
|
||
*
|
||
* Given an (x,y) coordinate on the screen, find the location of
|
||
* the character closest to that location.
|
||
*
|
||
* Results:
|
||
* The index at *indexPtr is modified to refer to the character
|
||
* on the display that is closest to (x,y).
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
void
|
||
TkTextPixelIndex(textPtr, x, y, indexPtr)
|
||
TkText *textPtr; /* Widget record for text widget. */
|
||
int x, y; /* Pixel coordinates of point in widget's
|
||
* window. */
|
||
TkTextIndex *indexPtr; /* This index gets filled in with the
|
||
* index of the character nearest to (x,y). */
|
||
{
|
||
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
register DLine *dlPtr;
|
||
register TkTextDispChunk *chunkPtr;
|
||
|
||
/*
|
||
* Make sure that all of the layout information about what's
|
||
* displayed where on the screen is up-to-date.
|
||
*/
|
||
|
||
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
|
||
UpdateDisplayInfo(textPtr);
|
||
}
|
||
|
||
/*
|
||
* If the coordinates are above the top of the window, then adjust
|
||
* them to refer to the upper-right corner of the window. If they're
|
||
* off to one side or the other, then adjust to the closest side.
|
||
*/
|
||
|
||
if (y < dInfoPtr->y) {
|
||
y = dInfoPtr->y;
|
||
x = dInfoPtr->x;
|
||
}
|
||
if (x >= dInfoPtr->maxX) {
|
||
x = dInfoPtr->maxX - 1;
|
||
}
|
||
if (x < dInfoPtr->x) {
|
||
x = dInfoPtr->x;
|
||
}
|
||
|
||
/*
|
||
* Find the display line containing the desired y-coordinate.
|
||
*/
|
||
|
||
for (dlPtr = dInfoPtr->dLinePtr; y >= (dlPtr->y + dlPtr->height);
|
||
dlPtr = dlPtr->nextPtr) {
|
||
if (dlPtr->nextPtr == NULL) {
|
||
/*
|
||
* Y-coordinate is off the bottom of the displayed text.
|
||
* Use the last character on the last line.
|
||
*/
|
||
|
||
x = dInfoPtr->maxX - 1;
|
||
break;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Scan through the line's chunks to find the one that contains
|
||
* the desired x-coordinate. Before doing this, translate the
|
||
* x-coordinate from the coordinate system of the window to the
|
||
* coordinate system of the line (to take account of x-scrolling).
|
||
*/
|
||
|
||
*indexPtr = dlPtr->index;
|
||
x = x - dInfoPtr->x + dInfoPtr->curPixelOffset;
|
||
for (chunkPtr = dlPtr->chunkPtr; x >= (chunkPtr->x + chunkPtr->width);
|
||
indexPtr->charIndex += chunkPtr->numChars,
|
||
chunkPtr = chunkPtr->nextPtr) {
|
||
if (chunkPtr->nextPtr == NULL) {
|
||
indexPtr->charIndex += chunkPtr->numChars - 1;
|
||
return;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* If the chunk has more than one character in it, ask it which
|
||
* character is at the desired location.
|
||
*/
|
||
|
||
if (chunkPtr->numChars > 1) {
|
||
indexPtr->charIndex += (*chunkPtr->measureProc)(chunkPtr, x);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* TkTextCharBbox --
|
||
*
|
||
* Given an index, find the bounding box of the screen area
|
||
* occupied by that character.
|
||
*
|
||
* Results:
|
||
* Zero is returned if the character is on the screen. -1
|
||
* means the character isn't on the screen. If the return value
|
||
* is 0, then the bounding box of the part of the character that's
|
||
* visible on the screen is returned to *xPtr, *yPtr, *widthPtr,
|
||
* and *heightPtr.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
int
|
||
TkTextCharBbox(textPtr, indexPtr, xPtr, yPtr, widthPtr, heightPtr)
|
||
TkText *textPtr; /* Widget record for text widget. */
|
||
TkTextIndex *indexPtr; /* Index of character whose bounding
|
||
* box is desired. */
|
||
int *xPtr, *yPtr; /* Filled with character's upper-left
|
||
* coordinate. */
|
||
int *widthPtr, *heightPtr; /* Filled in with character's dimensions. */
|
||
{
|
||
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
DLine *dlPtr;
|
||
register TkTextDispChunk *chunkPtr;
|
||
int index;
|
||
|
||
/*
|
||
* Make sure that all of the screen layout information is up to date.
|
||
*/
|
||
|
||
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
|
||
UpdateDisplayInfo(textPtr);
|
||
}
|
||
|
||
/*
|
||
* Find the display line containing the desired index.
|
||
*/
|
||
|
||
dlPtr = FindDLine(dInfoPtr->dLinePtr, indexPtr);
|
||
if ((dlPtr == NULL) || (TkTextIndexCmp(&dlPtr->index, indexPtr) > 0)) {
|
||
return -1;
|
||
}
|
||
|
||
/*
|
||
* Find the chunk within the line that contains the desired
|
||
* index.
|
||
*/
|
||
|
||
index = indexPtr->charIndex - dlPtr->index.charIndex;
|
||
for (chunkPtr = dlPtr->chunkPtr; ; chunkPtr = chunkPtr->nextPtr) {
|
||
if (chunkPtr == NULL) {
|
||
return -1;
|
||
}
|
||
if (index < chunkPtr->numChars) {
|
||
break;
|
||
}
|
||
index -= chunkPtr->numChars;
|
||
}
|
||
|
||
/*
|
||
* Call a chunk-specific procedure to find the horizontal range of
|
||
* the character within the chunk, then fill in the vertical range.
|
||
* The x-coordinate returned by bboxProc is a coordinate within a
|
||
* line, not a coordinate on the screen. Translate it to reflect
|
||
* horizontal scrolling.
|
||
*/
|
||
|
||
(*chunkPtr->bboxProc)(chunkPtr, index, dlPtr->y + dlPtr->spaceAbove,
|
||
dlPtr->height - dlPtr->spaceAbove - dlPtr->spaceBelow,
|
||
dlPtr->baseline - dlPtr->spaceAbove, xPtr, yPtr, widthPtr,
|
||
heightPtr);
|
||
*xPtr = *xPtr + dInfoPtr->x - dInfoPtr->curPixelOffset;
|
||
if ((index == (chunkPtr->numChars-1)) && (chunkPtr->nextPtr == NULL)) {
|
||
/*
|
||
* Last character in display line. Give it all the space up to
|
||
* the line.
|
||
*/
|
||
|
||
if (*xPtr > dInfoPtr->maxX) {
|
||
*xPtr = dInfoPtr->maxX;
|
||
}
|
||
*widthPtr = dInfoPtr->maxX - *xPtr;
|
||
}
|
||
if ((*xPtr + *widthPtr) <= dInfoPtr->x) {
|
||
return -1;
|
||
}
|
||
if ((*xPtr + *widthPtr) > dInfoPtr->maxX) {
|
||
*widthPtr = dInfoPtr->maxX - *xPtr;
|
||
if (*widthPtr <= 0) {
|
||
return -1;
|
||
}
|
||
}
|
||
if ((*yPtr + *heightPtr) > dInfoPtr->maxY) {
|
||
*heightPtr = dInfoPtr->maxY - *yPtr;
|
||
if (*heightPtr <= 0) {
|
||
return -1;
|
||
}
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* TkTextDLineInfo --
|
||
*
|
||
* Given an index, return information about the display line
|
||
* containing that character.
|
||
*
|
||
* Results:
|
||
* Zero is returned if the character is on the screen. -1
|
||
* means the character isn't on the screen. If the return value
|
||
* is 0, then information is returned in the variables pointed
|
||
* to by xPtr, yPtr, widthPtr, heightPtr, and basePtr.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
int
|
||
TkTextDLineInfo(textPtr, indexPtr, xPtr, yPtr, widthPtr, heightPtr, basePtr)
|
||
TkText *textPtr; /* Widget record for text widget. */
|
||
TkTextIndex *indexPtr; /* Index of character whose bounding
|
||
* box is desired. */
|
||
int *xPtr, *yPtr; /* Filled with line's upper-left
|
||
* coordinate. */
|
||
int *widthPtr, *heightPtr; /* Filled in with line's dimensions. */
|
||
int *basePtr; /* Filled in with the baseline position,
|
||
* measured as an offset down from *yPtr. */
|
||
{
|
||
TextDInfo *dInfoPtr = textPtr->dInfoPtr;
|
||
DLine *dlPtr;
|
||
|
||
/*
|
||
* Make sure that all of the screen layout information is up to date.
|
||
*/
|
||
|
||
if (dInfoPtr->flags & DINFO_OUT_OF_DATE) {
|
||
UpdateDisplayInfo(textPtr);
|
||
}
|
||
|
||
/*
|
||
* Find the display line containing the desired index.
|
||
*/
|
||
|
||
dlPtr = FindDLine(dInfoPtr->dLinePtr, indexPtr);
|
||
if ((dlPtr == NULL) || (TkTextIndexCmp(&dlPtr->index, indexPtr) > 0)) {
|
||
return -1;
|
||
}
|
||
|
||
*xPtr = dInfoPtr->x - dInfoPtr->curPixelOffset + dlPtr->chunkPtr->x;
|
||
*widthPtr = dlPtr->length - dlPtr->chunkPtr->x;
|
||
*yPtr = dlPtr->y;
|
||
if ((dlPtr->y + dlPtr->height) > dInfoPtr->maxY) {
|
||
*heightPtr = dInfoPtr->maxY - dlPtr->y;
|
||
} else {
|
||
*heightPtr = dlPtr->height;
|
||
}
|
||
*basePtr = dlPtr->baseline;
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* TkTextCharLayoutProc --
|
||
*
|
||
* This procedure is the "layoutProc" for character segments.
|
||
*
|
||
* Results:
|
||
* If there is something to display for the chunk then a
|
||
* non-zero value is returned and the fields of chunkPtr
|
||
* will be filled in (see the declaration of TkTextDispChunk
|
||
* in tkText.h for details). If zero is returned it means
|
||
* that no characters from this chunk fit in the window.
|
||
* If -1 is returned it means that this segment just doesn't
|
||
* need to be displayed (never happens for text).
|
||
*
|
||
* Side effects:
|
||
* Memory is allocated to hold additional information about
|
||
* the chunk.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
int
|
||
TkTextCharLayoutProc(textPtr, indexPtr, segPtr, offset, maxX, maxChars,
|
||
noCharsYet, wrapMode, chunkPtr)
|
||
TkText *textPtr; /* Text widget being layed out. */
|
||
TkTextIndex *indexPtr; /* Index of first character to lay out
|
||
* (corresponds to segPtr and offset). */
|
||
TkTextSegment *segPtr; /* Segment being layed out. */
|
||
int offset; /* Offset within segment of first character
|
||
* to consider. */
|
||
int maxX; /* Chunk must not occupy pixels at this
|
||
* position or higher. */
|
||
int maxChars; /* Chunk must not include more than this
|
||
* many characters. */
|
||
int noCharsYet; /* Non-zero means no characters have been
|
||
* assigned to this display line yet. */
|
||
Tk_Uid wrapMode; /* How to handle line wrapping: tkTextCharUid,
|
||
* tkTextNoneUid, or tkTextWordUid. */
|
||
register TkTextDispChunk *chunkPtr;
|
||
/* Structure to fill in with information
|
||
* about this chunk. The x field has already
|
||
* been set by the caller. */
|
||
{
|
||
Tk_Font tkfont;
|
||
int nextX, charsThatFit, count;
|
||
CharInfo *ciPtr;
|
||
char *p;
|
||
TkTextSegment *nextPtr;
|
||
Tk_FontMetrics fm;
|
||
|
||
/*
|
||
* Figure out how many characters will fit in the space we've got.
|
||
* Include the next character, even though it won't fit completely,
|
||
* if any of the following is true:
|
||
* (a) the chunk contains no characters and the display line contains
|
||
* no characters yet (i.e. the line isn't wide enough to hold
|
||
* even a single character).
|
||
* (b) at least one pixel of the character is visible, we haven't
|
||
* already exceeded the character limit, and the next character
|
||
* is a white space character.
|
||
*/
|
||
|
||
p = segPtr->body.chars + offset;
|
||
tkfont = chunkPtr->stylePtr->sValuePtr->tkfont;
|
||
charsThatFit = MeasureChars(tkfont, p, maxChars, chunkPtr->x, maxX, 0,
|
||
&nextX);
|
||
if (charsThatFit < maxChars) {
|
||
if ((charsThatFit == 0) && noCharsYet) {
|
||
charsThatFit = 1;
|
||
MeasureChars(tkfont, p, 1, chunkPtr->x, INT_MAX, 0, &nextX);
|
||
}
|
||
if ((nextX < maxX) && ((p[charsThatFit] == ' ')
|
||
|| (p[charsThatFit] == '\t'))) {
|
||
/*
|
||
* Space characters are funny, in that they are considered
|
||
* to fit if there is at least one pixel of space left on the
|
||
* line. Just give the space character whatever space is left.
|
||
*/
|
||
|
||
nextX = maxX;
|
||
charsThatFit++;
|
||
}
|
||
if (p[charsThatFit] == '\n') {
|
||
/*
|
||
* A newline character takes up no space, so if the previous
|
||
* character fits then so does the newline.
|
||
*/
|
||
|
||
charsThatFit++;
|
||
}
|
||
if (charsThatFit == 0) {
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
Tk_GetFontMetrics(tkfont, &fm);
|
||
|
||
/*
|
||
* Fill in the chunk structure and allocate and initialize a
|
||
* CharInfo structure. If the last character is a newline
|
||
* then don't bother to display it.
|
||
*/
|
||
|
||
chunkPtr->displayProc = CharDisplayProc;
|
||
chunkPtr->undisplayProc = CharUndisplayProc;
|
||
chunkPtr->measureProc = CharMeasureProc;
|
||
chunkPtr->bboxProc = CharBboxProc;
|
||
chunkPtr->numChars = charsThatFit;
|
||
chunkPtr->minAscent = fm.ascent + chunkPtr->stylePtr->sValuePtr->offset;
|
||
chunkPtr->minDescent = fm.descent - chunkPtr->stylePtr->sValuePtr->offset;
|
||
chunkPtr->minHeight = 0;
|
||
chunkPtr->width = nextX - chunkPtr->x;
|
||
chunkPtr->breakIndex = -1;
|
||
ciPtr = (CharInfo *) ckalloc((unsigned)
|
||
(sizeof(CharInfo) - 3 + charsThatFit));
|
||
chunkPtr->clientData = (ClientData) ciPtr;
|
||
ciPtr->numChars = charsThatFit;
|
||
strncpy(ciPtr->chars, p, (size_t) charsThatFit);
|
||
if (p[charsThatFit-1] == '\n') {
|
||
ciPtr->numChars--;
|
||
}
|
||
|
||
/*
|
||
* Compute a break location. If we're in word wrap mode, a
|
||
* break can occur after any space character, or at the end of
|
||
* the chunk if the next segment (ignoring those with zero size)
|
||
* is not a character segment.
|
||
*/
|
||
|
||
if (wrapMode != tkTextWordUid) {
|
||
chunkPtr->breakIndex = chunkPtr->numChars;
|
||
} else {
|
||
for (count = charsThatFit, p += charsThatFit-1; count > 0;
|
||
count--, p--) {
|
||
if (isspace(UCHAR(*p))) {
|
||
chunkPtr->breakIndex = count;
|
||
break;
|
||
}
|
||
}
|
||
if ((charsThatFit+offset) == segPtr->size) {
|
||
for (nextPtr = segPtr->nextPtr; nextPtr != NULL;
|
||
nextPtr = nextPtr->nextPtr) {
|
||
if (nextPtr->size != 0) {
|
||
if (nextPtr->typePtr != &tkTextCharType) {
|
||
chunkPtr->breakIndex = chunkPtr->numChars;
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* CharDisplayProc --
|
||
*
|
||
* This procedure is called to display a character chunk on
|
||
* the screen or in an off-screen pixmap.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Graphics are drawn.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
CharDisplayProc(chunkPtr, x, y, height, baseline, display, dst, screenY)
|
||
TkTextDispChunk *chunkPtr; /* Chunk that is to be drawn. */
|
||
int x; /* X-position in dst at which to
|
||
* draw this chunk (may differ from
|
||
* the x-position in the chunk because
|
||
* of scrolling). */
|
||
int y; /* Y-position at which to draw this
|
||
* chunk in dst. */
|
||
int height; /* Total height of line. */
|
||
int baseline; /* Offset of baseline from y. */
|
||
Display *display; /* Display to use for drawing. */
|
||
Drawable dst; /* Pixmap or window in which to draw
|
||
* chunk. */
|
||
int screenY; /* Y-coordinate in text window that
|
||
* corresponds to y. */
|
||
{
|
||
CharInfo *ciPtr = (CharInfo *) chunkPtr->clientData;
|
||
TextStyle *stylePtr;
|
||
StyleValues *sValuePtr;
|
||
int offsetChars, offsetX;
|
||
|
||
if ((x + chunkPtr->width) <= 0) {
|
||
/*
|
||
* The chunk is off-screen.
|
||
*/
|
||
|
||
return;
|
||
}
|
||
|
||
stylePtr = chunkPtr->stylePtr;
|
||
sValuePtr = stylePtr->sValuePtr;
|
||
|
||
/*
|
||
* If the text sticks out way to the left of the window, skip
|
||
* over the characters that aren't in the visible part of the
|
||
* window. This is essential if x is very negative (such as
|
||
* less than 32K); otherwise overflow problems will occur
|
||
* in servers that use 16-bit arithmetic, like X.
|
||
*/
|
||
|
||
offsetX = x;
|
||
offsetChars = 0;
|
||
if (x < 0) {
|
||
offsetChars = MeasureChars(sValuePtr->tkfont, ciPtr->chars,
|
||
ciPtr->numChars, x, 0, x - chunkPtr->x, &offsetX);
|
||
}
|
||
|
||
/*
|
||
* Draw the text, underline, and overstrike for this chunk.
|
||
*/
|
||
|
||
if (ciPtr->numChars > offsetChars) {
|
||
int numChars = ciPtr->numChars - offsetChars;
|
||
char *string = ciPtr->chars + offsetChars;
|
||
|
||
if ((numChars > 0) && (string[numChars - 1] == '\t')) {
|
||
numChars--;
|
||
}
|
||
Tk_DrawChars(display, dst, stylePtr->fgGC, sValuePtr->tkfont, string,
|
||
numChars, offsetX, y + baseline - sValuePtr->offset);
|
||
if (sValuePtr->underline) {
|
||
Tk_UnderlineChars(display, dst, stylePtr->fgGC, sValuePtr->tkfont,
|
||
ciPtr->chars + offsetChars, offsetX,
|
||
y + baseline - sValuePtr->offset,
|
||
0, numChars);
|
||
|
||
}
|
||
if (sValuePtr->overstrike) {
|
||
Tk_FontMetrics fm;
|
||
|
||
Tk_GetFontMetrics(sValuePtr->tkfont, &fm);
|
||
Tk_UnderlineChars(display, dst, stylePtr->fgGC, sValuePtr->tkfont,
|
||
ciPtr->chars + offsetChars, offsetX,
|
||
y + baseline - sValuePtr->offset
|
||
- fm.descent - (fm.ascent * 3) / 10,
|
||
0, numChars);
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* CharUndisplayProc --
|
||
*
|
||
* This procedure is called when a character chunk is no
|
||
* longer going to be displayed. It frees up resources
|
||
* that were allocated to display the chunk.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Memory and other resources get freed.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
CharUndisplayProc(textPtr, chunkPtr)
|
||
TkText *textPtr; /* Overall information about text
|
||
* widget. */
|
||
TkTextDispChunk *chunkPtr; /* Chunk that is about to be freed. */
|
||
{
|
||
CharInfo *ciPtr = (CharInfo *) chunkPtr->clientData;
|
||
|
||
ckfree((char *) ciPtr);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* CharMeasureProc --
|
||
*
|
||
* This procedure is called to determine which character in
|
||
* a character chunk lies over a given x-coordinate.
|
||
*
|
||
* Results:
|
||
* The return value is the index *within the chunk* of the
|
||
* character that covers the position given by "x".
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
CharMeasureProc(chunkPtr, x)
|
||
TkTextDispChunk *chunkPtr; /* Chunk containing desired coord. */
|
||
int x; /* X-coordinate, in same coordinate
|
||
* system as chunkPtr->x. */
|
||
{
|
||
CharInfo *ciPtr = (CharInfo *) chunkPtr->clientData;
|
||
int endX;
|
||
|
||
return MeasureChars(chunkPtr->stylePtr->sValuePtr->tkfont, ciPtr->chars,
|
||
chunkPtr->numChars-1, chunkPtr->x, x, 0, &endX);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* CharBboxProc --
|
||
*
|
||
* This procedure is called to compute the bounding box of
|
||
* the area occupied by a single character.
|
||
*
|
||
* Results:
|
||
* There is no return value. *xPtr and *yPtr are filled in
|
||
* with the coordinates of the upper left corner of the
|
||
* character, and *widthPtr and *heightPtr are filled in with
|
||
* the dimensions of the character in pixels. Note: not all
|
||
* of the returned bbox is necessarily visible on the screen
|
||
* (the rightmost part might be off-screen to the right,
|
||
* and the bottommost part might be off-screen to the bottom).
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
CharBboxProc(chunkPtr, index, y, lineHeight, baseline, xPtr, yPtr,
|
||
widthPtr, heightPtr)
|
||
TkTextDispChunk *chunkPtr; /* Chunk containing desired char. */
|
||
int index; /* Index of desired character within
|
||
* the chunk. */
|
||
int y; /* Topmost pixel in area allocated
|
||
* for this line. */
|
||
int lineHeight; /* Height of line, in pixels. */
|
||
int baseline; /* Location of line's baseline, in
|
||
* pixels measured down from y. */
|
||
int *xPtr, *yPtr; /* Gets filled in with coords of
|
||
* character's upper-left pixel.
|
||
* X-coord is in same coordinate
|
||
* system as chunkPtr->x. */
|
||
int *widthPtr; /* Gets filled in with width of
|
||
* character, in pixels. */
|
||
int *heightPtr; /* Gets filled in with height of
|
||
* character, in pixels. */
|
||
{
|
||
CharInfo *ciPtr = (CharInfo *) chunkPtr->clientData;
|
||
int maxX;
|
||
|
||
maxX = chunkPtr->width + chunkPtr->x;
|
||
MeasureChars(chunkPtr->stylePtr->sValuePtr->tkfont, ciPtr->chars, index,
|
||
chunkPtr->x, 1000000, 0, xPtr);
|
||
|
||
if (index == ciPtr->numChars) {
|
||
/*
|
||
* This situation only happens if the last character in a line
|
||
* is a space character, in which case it absorbs all of the
|
||
* extra space in the line (see TkTextCharLayoutProc).
|
||
*/
|
||
|
||
*widthPtr = maxX - *xPtr;
|
||
} else if ((ciPtr->chars[index] == '\t')
|
||
&& (index == (ciPtr->numChars-1))) {
|
||
/*
|
||
* The desired character is a tab character that terminates a
|
||
* chunk; give it all the space left in the chunk.
|
||
*/
|
||
|
||
*widthPtr = maxX - *xPtr;
|
||
} else {
|
||
MeasureChars(chunkPtr->stylePtr->sValuePtr->tkfont,
|
||
ciPtr->chars + index, 1, *xPtr, 1000000, 0, widthPtr);
|
||
if (*widthPtr > maxX) {
|
||
*widthPtr = maxX - *xPtr;
|
||
} else {
|
||
*widthPtr -= *xPtr;
|
||
}
|
||
}
|
||
*yPtr = y + baseline - chunkPtr->minAscent;
|
||
*heightPtr = chunkPtr->minAscent + chunkPtr->minDescent;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* AdjustForTab --
|
||
*
|
||
* This procedure is called to move a series of chunks right
|
||
* in order to align them with a tab stop.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* The width of chunkPtr gets adjusted so that it absorbs the
|
||
* extra space due to the tab. The x locations in all the chunks
|
||
* after chunkPtr are adjusted rightward to align with the tab
|
||
* stop given by tabArrayPtr and index.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
AdjustForTab(textPtr, tabArrayPtr, index, chunkPtr)
|
||
TkText *textPtr; /* Information about the text widget as
|
||
* a whole. */
|
||
TkTextTabArray *tabArrayPtr; /* Information about the tab stops
|
||
* that apply to this line. May be
|
||
* NULL to indicate default tabbing
|
||
* (every 8 chars). */
|
||
int index; /* Index of current tab stop. */
|
||
TkTextDispChunk *chunkPtr; /* Chunk whose last character is
|
||
* the tab; the following chunks
|
||
* contain information to be shifted
|
||
* right. */
|
||
|
||
{
|
||
int x, desired, delta, width, decimal, i, gotDigit;
|
||
TkTextDispChunk *chunkPtr2, *decimalChunkPtr;
|
||
CharInfo *ciPtr;
|
||
int tabX, prev, spaceWidth;
|
||
char *p;
|
||
TkTextTabAlign alignment;
|
||
|
||
if (chunkPtr->nextPtr == NULL) {
|
||
/*
|
||
* Nothing after the actual tab; just return.
|
||
*/
|
||
|
||
return;
|
||
}
|
||
|
||
/*
|
||
* If no tab information has been given, do the usual thing:
|
||
* round up to the next boundary of 8 average-sized characters.
|
||
*/
|
||
|
||
x = chunkPtr->nextPtr->x;
|
||
if ((tabArrayPtr == NULL) || (tabArrayPtr->numTabs == 0)) {
|
||
/*
|
||
* No tab information has been given, so use the default
|
||
* interpretation of tabs.
|
||
*/
|
||
|
||
desired = NextTabStop(textPtr->tkfont, x, 0);
|
||
goto update;
|
||
}
|
||
|
||
if (index < tabArrayPtr->numTabs) {
|
||
alignment = tabArrayPtr->tabs[index].alignment;
|
||
tabX = tabArrayPtr->tabs[index].location;
|
||
} else {
|
||
/*
|
||
* Ran out of tab stops; compute a tab position by extrapolating
|
||
* from the last two tab positions.
|
||
*/
|
||
|
||
if (tabArrayPtr->numTabs > 1) {
|
||
prev = tabArrayPtr->tabs[tabArrayPtr->numTabs-2].location;
|
||
} else {
|
||
prev = 0;
|
||
}
|
||
alignment = tabArrayPtr->tabs[tabArrayPtr->numTabs-1].alignment;
|
||
tabX = tabArrayPtr->tabs[tabArrayPtr->numTabs-1].location
|
||
+ (index + 1 - tabArrayPtr->numTabs)
|
||
* (tabArrayPtr->tabs[tabArrayPtr->numTabs-1].location - prev);
|
||
}
|
||
|
||
if (alignment == LEFT) {
|
||
desired = tabX;
|
||
goto update;
|
||
}
|
||
|
||
if ((alignment == CENTER) || (alignment == RIGHT)) {
|
||
/*
|
||
* Compute the width of all the information in the tab group,
|
||
* then use it to pick a desired location.
|
||
*/
|
||
|
||
width = 0;
|
||
for (chunkPtr2 = chunkPtr->nextPtr; chunkPtr2 != NULL;
|
||
chunkPtr2 = chunkPtr2->nextPtr) {
|
||
width += chunkPtr2->width;
|
||
}
|
||
if (alignment == CENTER) {
|
||
desired = tabX - width/2;
|
||
} else {
|
||
desired = tabX - width;
|
||
}
|
||
goto update;
|
||
}
|
||
|
||
/*
|
||
* Must be numeric alignment. Search through the text to be
|
||
* tabbed, looking for the last , or . before the first character
|
||
* that isn't a number, comma, period, or sign.
|
||
*/
|
||
|
||
decimalChunkPtr = NULL;
|
||
decimal = gotDigit = 0;
|
||
for (chunkPtr2 = chunkPtr->nextPtr; chunkPtr2 != NULL;
|
||
chunkPtr2 = chunkPtr2->nextPtr) {
|
||
if (chunkPtr2->displayProc != CharDisplayProc) {
|
||
continue;
|
||
}
|
||
ciPtr = (CharInfo *) chunkPtr2->clientData;
|
||
for (p = ciPtr->chars, i = 0; i < ciPtr->numChars; p++, i++) {
|
||
if (isdigit(UCHAR(*p))) {
|
||
gotDigit = 1;
|
||
} else if ((*p == '.') || (*p == ',')) {
|
||
decimal = p-ciPtr->chars;
|
||
decimalChunkPtr = chunkPtr2;
|
||
} else if (gotDigit) {
|
||
if (decimalChunkPtr == NULL) {
|
||
decimal = p-ciPtr->chars;
|
||
decimalChunkPtr = chunkPtr2;
|
||
}
|
||
goto endOfNumber;
|
||
}
|
||
}
|
||
}
|
||
endOfNumber:
|
||
if (decimalChunkPtr != NULL) {
|
||
int curX;
|
||
|
||
ciPtr = (CharInfo *) decimalChunkPtr->clientData;
|
||
MeasureChars(decimalChunkPtr->stylePtr->sValuePtr->tkfont,
|
||
ciPtr->chars, decimal, decimalChunkPtr->x, 1000000, 0, &curX);
|
||
desired = tabX - (curX - x);
|
||
goto update;
|
||
} else {
|
||
/*
|
||
* There wasn't a decimal point. Right justify the text.
|
||
*/
|
||
|
||
width = 0;
|
||
for (chunkPtr2 = chunkPtr->nextPtr; chunkPtr2 != NULL;
|
||
chunkPtr2 = chunkPtr2->nextPtr) {
|
||
width += chunkPtr2->width;
|
||
}
|
||
desired = tabX - width;
|
||
}
|
||
|
||
/*
|
||
* Shift all of the chunks to the right so that the left edge is
|
||
* at the desired location, then expand the chunk containing the
|
||
* tab. Be sure that the tab occupies at least the width of a
|
||
* space character.
|
||
*/
|
||
|
||
update:
|
||
delta = desired - x;
|
||
MeasureChars(textPtr->tkfont, " ", 1, 0, INT_MAX, 0, &spaceWidth);
|
||
if (delta < spaceWidth) {
|
||
delta = spaceWidth;
|
||
}
|
||
for (chunkPtr2 = chunkPtr->nextPtr; chunkPtr2 != NULL;
|
||
chunkPtr2 = chunkPtr2->nextPtr) {
|
||
chunkPtr2->x += delta;
|
||
}
|
||
chunkPtr->width += delta;
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* SizeOfTab --
|
||
*
|
||
* This returns an estimate of the amount of white space that will
|
||
* be consumed by a tab.
|
||
*
|
||
* Results:
|
||
* The return value is the minimum number of pixels that will
|
||
* be occupied by the index'th tab of tabArrayPtr, assuming that
|
||
* the current position on the line is x and the end of the
|
||
* line is maxX. For numeric tabs, this is a conservative
|
||
* estimate. The return value is always >= 0.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
SizeOfTab(textPtr, tabArrayPtr, index, x, maxX)
|
||
TkText *textPtr; /* Information about the text widget as
|
||
* a whole. */
|
||
TkTextTabArray *tabArrayPtr; /* Information about the tab stops
|
||
* that apply to this line. NULL
|
||
* means use default tabbing (every
|
||
* 8 chars.) */
|
||
int index; /* Index of current tab stop. */
|
||
int x; /* Current x-location in line. Only
|
||
* used if tabArrayPtr == NULL. */
|
||
int maxX; /* X-location of pixel just past the
|
||
* right edge of the line. */
|
||
{
|
||
int tabX, prev, result, spaceWidth;
|
||
TkTextTabAlign alignment;
|
||
|
||
if ((tabArrayPtr == NULL) || (tabArrayPtr->numTabs == 0)) {
|
||
tabX = NextTabStop(textPtr->tkfont, x, 0);
|
||
return tabX - x;
|
||
}
|
||
if (index < tabArrayPtr->numTabs) {
|
||
tabX = tabArrayPtr->tabs[index].location;
|
||
alignment = tabArrayPtr->tabs[index].alignment;
|
||
} else {
|
||
/*
|
||
* Ran out of tab stops; compute a tab position by extrapolating
|
||
* from the last two tab positions.
|
||
*/
|
||
|
||
if (tabArrayPtr->numTabs > 1) {
|
||
prev = tabArrayPtr->tabs[tabArrayPtr->numTabs-2].location;
|
||
} else {
|
||
prev = 0;
|
||
}
|
||
tabX = tabArrayPtr->tabs[tabArrayPtr->numTabs-1].location
|
||
+ (index + 1 - tabArrayPtr->numTabs)
|
||
* (tabArrayPtr->tabs[tabArrayPtr->numTabs-1].location - prev);
|
||
alignment = tabArrayPtr->tabs[tabArrayPtr->numTabs-1].alignment;
|
||
}
|
||
if (alignment == CENTER) {
|
||
/*
|
||
* Be very careful in the arithmetic below, because maxX may
|
||
* be the largest positive number: watch out for integer
|
||
* overflow.
|
||
*/
|
||
|
||
if ((maxX-tabX) < (tabX - x)) {
|
||
result = (maxX - x) - 2*(maxX - tabX);
|
||
} else {
|
||
result = 0;
|
||
}
|
||
goto done;
|
||
}
|
||
if (alignment == RIGHT) {
|
||
result = 0;
|
||
goto done;
|
||
}
|
||
|
||
/*
|
||
* Note: this treats NUMERIC alignment the same as LEFT
|
||
* alignment, which is somewhat conservative. However, it's
|
||
* pretty tricky at this point to figure out exactly where
|
||
* the damn decimal point will be.
|
||
*/
|
||
|
||
if (tabX > x) {
|
||
result = tabX - x;
|
||
} else {
|
||
result = 0;
|
||
}
|
||
|
||
done:
|
||
MeasureChars(textPtr->tkfont, " ", 1, 0, INT_MAX, 0, &spaceWidth);
|
||
if (result < spaceWidth) {
|
||
result = spaceWidth;
|
||
}
|
||
return result;
|
||
}
|
||
|
||
/*
|
||
*---------------------------------------------------------------------------
|
||
*
|
||
* NextTabStop --
|
||
*
|
||
* Given the current position, determine where the next default
|
||
* tab stop would be located. This procedure is called when the
|
||
* current chunk in the text has no tabs defined and so the default
|
||
* tab spacing for the font should be used.
|
||
*
|
||
* Results:
|
||
* The location in pixels of the next tab stop.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*---------------------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
NextTabStop(tkfont, x, tabOrigin)
|
||
Tk_Font tkfont; /* Font in which chunk that contains tab
|
||
* stop will be drawn. */
|
||
int x; /* X-position in pixels where last
|
||
* character was drawn. The next tab stop
|
||
* occurs somewhere after this location. */
|
||
int tabOrigin; /* The origin for tab stops. May be
|
||
* non-zero if text has been scrolled. */
|
||
{
|
||
int tabWidth, rem;
|
||
|
||
tabWidth = Tk_TextWidth(tkfont, "0", 1) * 8;
|
||
if (tabWidth == 0) {
|
||
tabWidth = 1;
|
||
}
|
||
|
||
x += tabWidth;
|
||
rem = (x - tabOrigin) % tabWidth;
|
||
if (rem < 0) {
|
||
rem += tabWidth;
|
||
}
|
||
x -= rem;
|
||
return x;
|
||
}
|
||
|
||
/*
|
||
*---------------------------------------------------------------------------
|
||
*
|
||
* MeasureChars --
|
||
*
|
||
* Determine the number of characters from the string that will fit
|
||
* in the given horizontal span. The measurement is done under the
|
||
* assumption that Tk_DisplayChars will be used to actually display
|
||
* the characters.
|
||
*
|
||
* If tabs are encountered in the string, they will be expanded
|
||
* to the next tab stop, unless the TK_IGNORE_TABS flag is specified.
|
||
*
|
||
* If a newline is encountered in the string, the line will be
|
||
* broken at that point, unless the TK_NEWSLINES_NOT_SPECIAL flag
|
||
* is specified.
|
||
*
|
||
* Results:
|
||
* The return value is the number of characters from source
|
||
* that fit in the span given by startX and maxX. *nextXPtr
|
||
* is filled in with the x-coordinate at which the first
|
||
* character that didn't fit would be drawn, if it were to
|
||
* be drawn.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
MeasureChars(tkfont, source, maxChars, startX, maxX, tabOrigin, nextXPtr)
|
||
Tk_Font tkfont; /* Font in which to draw characters. */
|
||
CONST char *source; /* Characters to be displayed. Need not
|
||
* be NULL-terminated. */
|
||
int maxChars; /* Maximum # of characters to consider from
|
||
* source. */
|
||
int startX; /* X-position at which first character will
|
||
* be drawn. */
|
||
int maxX; /* Don't consider any character that would
|
||
* cross this x-position. */
|
||
int tabOrigin; /* X-location that serves as "origin" for
|
||
* tab stops. */
|
||
int *nextXPtr; /* Return x-position of terminating
|
||
* character here. */
|
||
{
|
||
int curX, width, ch;
|
||
CONST char *special, *end, *start;
|
||
|
||
ch = 0; /* lint. */
|
||
curX = startX;
|
||
special = source;
|
||
end = source + maxChars;
|
||
for (start = source; start < end; ) {
|
||
if (start >= special) {
|
||
/*
|
||
* Find the next special character in the string.
|
||
*/
|
||
|
||
for (special = start; special < end; special++) {
|
||
ch = *special;
|
||
if ((ch == '\t') || (ch == '\n')) {
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Special points at the next special character (or the end of the
|
||
* string). Process characters between start and special.
|
||
*/
|
||
|
||
if (curX >= maxX) {
|
||
break;
|
||
}
|
||
start += Tk_MeasureChars(tkfont, start, special - start, maxX - curX,
|
||
0, &width);
|
||
curX += width;
|
||
if (start < special) {
|
||
/*
|
||
* No more chars fit in line.
|
||
*/
|
||
|
||
break;
|
||
}
|
||
if (special < end) {
|
||
if (ch == '\t') {
|
||
start++;
|
||
} else {
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
*nextXPtr = curX;
|
||
return start - source;
|
||
}
|