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archie/tk4.2/generic/tkTextDisp.c

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Update tcl/tk for tcl-dp
2024-05-27 16:40:40 +02:00
/*
* tkTextDisp.c --
*
* This module provides facilities to display text widgets. It is
* the only place where information is kept about the screen layout
* of text widgets.
*
* Copyright (c) 1992-1994 The Regents of the University of California.
* Copyright (c) 1994-1995 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* SCCS: @(#) tkTextDisp.c 1.114 96/09/05 09:59:43
*/
#include "tkPort.h"
#include "tkInt.h"
#include "tkText.h"
/*
* The following structure describes how to display a range of characters.
* The information is generated by scanning all of the tags associated
* with the characters and combining that with default information for
* the overall widget. These structures form the hash keys for
* dInfoPtr->styleTable.
*/
typedef struct StyleValues {
Tk_3DBorder border; /* Used for drawing background under text.
* NULL means use widget background. */
int borderWidth; /* Width of 3-D border for background. */
int relief; /* 3-D relief for background. */
Pixmap bgStipple; /* Stipple bitmap for background. None
* means draw solid. */
XColor *fgColor; /* Foreground color for text. */
XFontStruct *fontPtr; /* Font for displaying text. */
Pixmap fgStipple; /* Stipple bitmap for text and other
* foreground stuff. None means draw
* solid.*/
int justify; /* Justification style for text. */
int lMargin1; /* Left margin, in pixels, for first display
* line of each text line. */
int lMargin2; /* Left margin, in pixels, for second and
* later display lines of each text line. */
int offset; /* Offset in pixels of baseline, relative to
* baseline of line. */
int overstrike; /* Non-zero means draw overstrike through
* text. */
int rMargin; /* Right margin, in pixels. */
int spacing1; /* Spacing above first dline in text line. */
int spacing2; /* Spacing between lines of dline. */
int spacing3; /* Spacing below last dline in text line. */
TkTextTabArray *tabArrayPtr;/* Locations and types of tab stops (may
* be NULL). */
int underline; /* Non-zero means draw underline underneath
* text. */
Tk_Uid wrapMode; /* How to handle wrap-around for this tag.
* One of tkTextCharUid, tkTextNoneUid,
* or tkTextWordUid. */
} StyleValues;
/*
* The following structure extends the StyleValues structure above with
* graphics contexts used to actually draw the characters. The entries
* in dInfoPtr->styleTable point to structures of this type.
*/
typedef struct TextStyle {
int refCount; /* Number of times this structure is
* referenced in Chunks. */
GC bgGC; /* Graphics context for background. None
* means use widget background. */
GC fgGC; /* Graphics context for foreground. */
StyleValues *sValuePtr; /* Raw information from which GCs were
* derived. */
Tcl_HashEntry *hPtr; /* Pointer to entry in styleTable. Used
* to delete entry. */
} TextStyle;
/*
* The following macro determines whether two styles have the same
* background so that, for example, no beveled border should be drawn
* between them.
*/
#define SAME_BACKGROUND(s1, s2) \
(((s1)->sValuePtr->border == (s2)->sValuePtr->border) \
&& ((s1)->sValuePtr->borderWidth == (s2)->sValuePtr->borderWidth) \
&& ((s1)->sValuePtr->relief == (s2)->sValuePtr->relief) \
&& ((s1)->sValuePtr->bgStipple == (s2)->sValuePtr->bgStipple))
/*
* The following structure describes one line of the display, which may
* be either part or all of one line of the text.
*/
typedef struct DLine {
TkTextIndex index; /* Identifies first character in text
* that is displayed on this line. */
int count; /* Number of characters accounted for by this
* display line, including a trailing space
* or newline that isn't actually displayed. */
int y; /* Y-position at which line is supposed to
* be drawn (topmost pixel of rectangular
* area occupied by line). */
int oldY; /* Y-position at which line currently
* appears on display. -1 means line isn't
* currently visible on display and must be
* redrawn. This is used to move lines by
* scrolling rather than re-drawing. */
int height; /* Height of line, in pixels. */
int baseline; /* Offset of text baseline from y, in
* pixels. */
int spaceAbove; /* How much extra space was added to the
* top of the line because of spacing
* options. This is included in height
* and baseline. */
int spaceBelow; /* How much extra space was added to the
* bottom of the line because of spacing
* options. This is included in height. */
int length; /* Total length of line, in pixels. */
TkTextDispChunk *chunkPtr; /* Pointer to first chunk in list of all
* of those that are displayed on this
* line of the screen. */
struct DLine *nextPtr; /* Next in list of all display lines for
* this window. The list is sorted in
* order from top to bottom. Note: the
* next DLine doesn't always correspond
* to the next line of text: (a) can have
* multiple DLines for one text line, and
* (b) can have gaps where DLine's have been
* deleted because they're out of date. */
int flags; /* Various flag bits: see below for values. */
} DLine;
/*
* Flag bits for DLine structures:
*
* HAS_3D_BORDER - Non-zero means that at least one of the
* chunks in this line has a 3D border, so
* it potentially interacts with 3D borders
* in neighboring lines (see
* DisplayLineBackground).
* NEW_LAYOUT - Non-zero means that the line has been
* re-layed out since the last time the
* display was updated.
* TOP_LINE - Non-zero means that this was the top line
* in the window the last time that the window
* was laid out. This is important because
* a line may be displayed differently if its
* at the top or bottom than if it's in the
* middle (e.g. beveled edges aren't displayed
* for middle lines if the adjacent line has
* a similar background).
* BOTTOM_LINE - Non-zero means that this was the bottom line
* in the window the last time that the window
* was laid out.
*/
#define HAS_3D_BORDER 1
#define NEW_LAYOUT 2
#define TOP_LINE 4
#define BOTTOM_LINE 8
/*
* Overall display information for a text widget:
*/
typedef struct TextDInfo {
Tcl_HashTable styleTable; /* Hash table that maps from StyleValues
* to TextStyles for this widget. */
DLine *dLinePtr; /* First in list of all display lines for
* this widget, in order from top to bottom. */
GC copyGC; /* Graphics context for copying from off-
* screen pixmaps onto screen. */
GC scrollGC; /* Graphics context for copying from one place
* in the window to another (scrolling):
* differs from copyGC in that we need to get
* GraphicsExpose events. */
int x; /* First x-coordinate that may be used for
* actually displaying line information.
* Leaves space for border, etc. */
int y; /* First y-coordinate that may be used for
* actually displaying line information.
* Leaves space for border, etc. */
int maxX; /* First x-coordinate to right of available
* space for displaying lines. */
int maxY; /* First y-coordinate below available
* space for displaying lines. */
int topOfEof; /* Top-most pixel (lowest y-value) that has
* been drawn in the appropriate fashion for
* the portion of the window after the last
* line of the text. This field is used to
* figure out when to redraw part or all of
* the eof field. */
/*
* Information used for scrolling:
*/
int newCharOffset; /* Desired x scroll position, measured as the
* number of average-size characters off-screen
* to the left for a line with no left
* margin. */
int curPixelOffset; /* Actual x scroll position, measured as the
* number of pixels off-screen to the left. */
int maxLength; /* Length in pixels of longest line that's
* visible in window (length may exceed window
* size). If there's no wrapping, this will
* be zero. */
double xScrollFirst, xScrollLast;
/* Most recent values reported to horizontal
* scrollbar; used to eliminate unnecessary
* reports. */
double yScrollFirst, yScrollLast;
/* Most recent values reported to vertical
* scrollbar; used to eliminate unnecessary
* reports. */
/*
* The following information is used to implement scanning:
*/
int scanMarkChar; /* Character that was at the left edge of
* the window when the scan started. */
int scanMarkX; /* X-position of mouse at time scan started. */
int scanTotalScroll; /* Total scrolling (in screen lines) that has
* occurred since scanMarkY was set. */
int scanMarkY; /* Y-position of mouse at time scan started. */
/*
* Miscellaneous information:
*/
int dLinesInvalidated; /* This value is set to 1 whenever something
* happens that invalidates information in
* DLine structures; if a redisplay
* is in progress, it will see this and
* abort the redisplay. This is needed
* because, for example, an embedded window
* could change its size when it is first
* displayed, invalidating the DLine that
* is currently being displayed. If redisplay
* continues, it will use freed memory and
* could dump core. */
int flags; /* Various flag values: see below for
* definitions. */
} TextDInfo;
/*
* In TkTextDispChunk structures for character segments, the clientData
* field points to one of the following structures:
*/
typedef struct CharInfo {
int numChars; /* Number of characters to display. */
char chars[4]; /* Characters to display. Actual size
* will be numChars, not 4. THIS MUST BE
* THE LAST FIELD IN THE STRUCTURE. */
} CharInfo;
/*
* Flag values for TextDInfo structures:
*
* DINFO_OUT_OF_DATE: Non-zero means that the DLine structures
* for this window are partially or completely
* out of date and need to be recomputed.
* REDRAW_PENDING: Means that a when-idle handler has been
* scheduled to update the display.
* REDRAW_BORDERS: Means window border or pad area has
* potentially been damaged and must be redrawn.
* REPICK_NEEDED: 1 means that the widget has been modified
* in a way that could change the current
* character (a different character might be
* under the mouse cursor now). Need to
* recompute the current character before
* the next redisplay.
*/
#define DINFO_OUT_OF_DATE 1
#define REDRAW_PENDING 2
#define REDRAW_BORDERS 4
#define REPICK_NEEDED 8
/*
* The following counters keep statistics about redisplay that can be
* checked to see how clever this code is at reducing redisplays.
*/
static int numRedisplays; /* Number of calls to DisplayText. */
static int linesRedrawn; /* Number of calls to DisplayDLine. */
static int numCopies; /* Number of calls to XCopyArea to copy part
* of the screen. */
/*
* Forward declarations for procedures defined later in this file:
*/
static void AdjustForTab _ANSI_ARGS_((TkText *textPtr,
TkTextTabArray *tabArrayPtr, int index,
TkTextDispChunk *chunkPtr));
static void CharBboxProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr,
int index, int y, int lineHeight, int baseline,
int *xPtr, int *yPtr, int *widthPtr,
int *heightPtr));
static void CharDisplayProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr,
int x, int y, int height, int baseline,
Display *display, Drawable dst, int screenY));
static int CharMeasureProc _ANSI_ARGS_((TkTextDispChunk *chunkPtr,
int x));
static void CharUndisplayProc _ANSI_ARGS_((TkText *textPtr,
TkTextDispChunk *chunkPtr));
static void DisplayDLine _ANSI_ARGS_((TkText *textPtr,
DLine *dlPtr, DLine *prevPtr, Pixmap pixmap));
static void DisplayLineBackground _ANSI_ARGS_((TkText *textPtr,
DLine *dlPtr, DLine *prevPtr, Pixmap pixmap));
static void DisplayText _ANSI_ARGS_((ClientData clientData));
static DLine * FindDLine _ANSI_ARGS_((DLine *dlPtr,
TkTextIndex *indexPtr));
static void FreeDLines _ANSI_ARGS_((TkText *textPtr,
DLine *firstPtr, DLine *lastPtr, int unlink));
static void FreeStyle _ANSI_ARGS_((TkText *textPtr,
TextStyle *stylePtr));
static TextStyle * GetStyle _ANSI_ARGS_((TkText *textPtr,
TkTextIndex *indexPtr));
static void GetXView _ANSI_ARGS_((Tcl_Interp *interp,
TkText *textPtr, int report));
static void GetYView _ANSI_ARGS_((Tcl_Interp *interp,
TkText *textPtr, int report));
static DLine * LayoutDLine _ANSI_ARGS_((TkText *textPtr,
TkTextIndex *indexPtr));
static void MeasureUp _ANSI_ARGS_((TkText *textPtr,
TkTextIndex *srcPtr, int distance,
TkTextIndex *dstPtr));
static void UpdateDisplayInfo _ANSI_ARGS_((TkText *textPtr));
static void ScrollByLines _ANSI_ARGS_((TkText *textPtr,
int offset));
static int SizeOfTab _ANSI_ARGS_((TkText *textPtr,
TkTextTabArray *tabArrayPtr, int index, int x,
int maxX));
static void TextInvalidateRegion _ANSI_ARGS_((TkText *textPtr,
TkRegion region));
/*
*----------------------------------------------------------------------
*
* TkTextCreateDInfo --
*
* This procedure is called when a new text widget is created.
* Its job is to set up display-related information for the widget.
*
* Results:
* None.
*
* Side effects:
* A TextDInfo data structure is allocated and initialized and attached
* to textPtr.
*
*----------------------------------------------------------------------
*/
void
TkTextCreateDInfo(textPtr)
TkText *textPtr; /* Overall information for text widget. */
{
register TextDInfo *dInfoPtr;
XGCValues gcValues;
dInfoPtr = (TextDInfo *) ckalloc(sizeof(TextDInfo));
Tcl_InitHashTable(&dInfoPtr->styleTable, sizeof(StyleValues)/sizeof(int));
dInfoPtr->dLinePtr = NULL;
dInfoPtr->copyGC = None;
gcValues.graphics_exposures = True;
dInfoPtr->scrollGC = Tk_GetGC(textPtr->tkwin, GCGraphicsExposures,
&gcValues);
dInfoPtr->topOfEof = 0;
dInfoPtr->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.fontPtr = textPtr->fontPtr;
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];
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->fontPtr != None) && (tagPtr->priority > fontPrio)) {
styleValues.fontPtr = tagPtr->fontPtr;
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 = styleValues.fontPtr->fid;
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;
leftX = chunkPtr->x;
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 = chunkPtr->x;
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 = nextPtr2->x;
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 = chunkPtr->x;
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 = nextPtr2->x;
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 - textPtr->padX, oldY,
(dInfoPtr->maxX - (dInfoPtr->x - textPtr->padX)), 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) || (rect.y < inset)
|| ((rect.x + rect.width) > (Tk_Width(textPtr->tkwin) - inset))
|| (maxY > (Tk_Height(textPtr->tkwin) - inset))) {
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, lineHeight;
TkTextIndex tmpIndex, rounded;
/*
* 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.
*/
lineHeight = textPtr->fontPtr->ascent + textPtr->fontPtr->descent;
bottomY = (dInfoPtr->y + dInfoPtr->maxY + lineHeight)/2;
close = (dInfoPtr->maxY - dInfoPtr->y)/3;
if (close < 3*lineHeight) {
close = 3*lineHeight;
}
close += lineHeight;
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 = ((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, lineHeight, charsInLine;
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 = fraction;
TkTextMakeIndex(textPtr->tree, lineNum, 0, &index);
charsInLine = TkBTreeCharsInLine(index.linePtr);
index.charIndex = (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.
*/
lineHeight = textPtr->fontPtr->ascent + textPtr->fontPtr->descent;
if (count < 0) {
pixels = (dInfoPtr->maxY - 2*lineHeight - dInfoPtr->y)*(-count)
+ lineHeight;
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*lineHeight - 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;
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;
totalScroll = (10*(dInfoPtr->scanMarkY - y))
/ (textPtr->fontPtr->ascent + textPtr->fontPtr->descent);
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. */
{
XFontStruct *fontPtr;
int nextX, charsThatFit, count;
CharInfo *ciPtr;
char *p;
TkTextSegment *nextPtr;
/*
* 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;
fontPtr = chunkPtr->stylePtr->sValuePtr->fontPtr;
charsThatFit = TkMeasureChars(fontPtr, p, maxChars, chunkPtr->x,
maxX, 0, TK_IGNORE_TABS, &nextX);
if (charsThatFit < maxChars) {
if ((charsThatFit == 0) && noCharsYet) {
charsThatFit = 1;
TkMeasureChars(fontPtr, p, 1, chunkPtr->x, INT_MAX, 0,
TK_IGNORE_TABS, &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;
}
}
/*
* 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 = fontPtr->ascent
+ chunkPtr->stylePtr->sValuePtr->offset;
chunkPtr->minDescent = fontPtr->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' || p[charsThatFit-1] == '\r') {
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 = TkMeasureChars(sValuePtr->fontPtr, ciPtr->chars,
ciPtr->numChars, x, 0, x - chunkPtr->x, TK_IGNORE_TABS, &offsetX);
}
/*
* Draw the text, underline, and overstrike for this chunk.
*/
if (ciPtr->numChars > offsetChars) {
TkDisplayChars(display, dst, stylePtr->fgGC, sValuePtr->fontPtr,
ciPtr->chars + offsetChars, ciPtr->numChars - offsetChars,
offsetX, y + baseline - sValuePtr->offset, x - chunkPtr->x,
TK_IGNORE_TABS);
if (sValuePtr->underline) {
TkUnderlineChars(display, dst, stylePtr->fgGC,
sValuePtr->fontPtr, ciPtr->chars + offsetChars, offsetX,
y + baseline - sValuePtr->offset, x - chunkPtr->x,
TK_IGNORE_TABS, 0, ciPtr->numChars-offsetChars-1);
}
if (sValuePtr->overstrike) {
TkUnderlineChars(display, dst, stylePtr->fgGC,
sValuePtr->fontPtr, ciPtr->chars + offsetChars, offsetX,
y + baseline - sValuePtr->offset
- sValuePtr->fontPtr->descent
- (sValuePtr->fontPtr->ascent*3)/10,
x - chunkPtr->x, TK_IGNORE_TABS, 0,
ciPtr->numChars-offsetChars-1);
}
}
}
/*
*--------------------------------------------------------------
*
* 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 TkMeasureChars(chunkPtr->stylePtr->sValuePtr->fontPtr,
ciPtr->chars, chunkPtr->numChars-1, chunkPtr->x, x, 0,
TK_IGNORE_TABS, &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;
TkMeasureChars(chunkPtr->stylePtr->sValuePtr->fontPtr,
ciPtr->chars, index, chunkPtr->x, 1000000, 0, TK_IGNORE_TABS,
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 {
TkMeasureChars(chunkPtr->stylePtr->sValuePtr->fontPtr,
ciPtr->chars + index, 1, *xPtr, 1000000, 0, TK_IGNORE_TABS,
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;
TkTextTab *tabPtr;
CharInfo *ciPtr = NULL; /* Initialization needed only to
* prevent compiler warnings. */
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.
*/
TkMeasureChars(textPtr->fontPtr, "\t", 1, x, INT_MAX, 0, 0, &desired);
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);
}
tabPtr = &tabArrayPtr->tabs[index];
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;
TkMeasureChars(decimalChunkPtr->stylePtr->sValuePtr->fontPtr,
ciPtr->chars, decimal, decimalChunkPtr->x, 1000000, 0,
TK_IGNORE_TABS, &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;
TkMeasureChars(textPtr->fontPtr, " ", 1, 0, INT_MAX, 0, 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)) {
TkMeasureChars(textPtr->fontPtr, "\t", 1, x, INT_MAX, 0, 0, &tabX);
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:
TkMeasureChars(textPtr->fontPtr, " ", 1, 0, INT_MAX, 0, 0, &spaceWidth);
if (result < spaceWidth) {
result = spaceWidth;
}
return result;
}
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