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-rw-r--r--generic/tkTextDisp.c88
1 files changed, 58 insertions, 30 deletions
diff --git a/generic/tkTextDisp.c b/generic/tkTextDisp.c
index 7e6713b..040c907 100644
--- a/generic/tkTextDisp.c
+++ b/generic/tkTextDisp.c
@@ -13,7 +13,7 @@
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
- * RCS: @(#) $Id: tkTextDisp.c,v 1.30 2003/11/15 02:49:36 vincentdarley Exp $
+ * RCS: @(#) $Id: tkTextDisp.c,v 1.31 2003/11/15 12:47:15 vincentdarley Exp $
*/
#include "tkPort.h"
@@ -429,8 +429,8 @@ static void YScrollByLines _ANSI_ARGS_((TkText *textPtr,
static void YScrollByPixels _ANSI_ARGS_((TkText *textPtr,
int offset));
static int SizeOfTab _ANSI_ARGS_((TkText *textPtr,
- TkTextTabArray *tabArrayPtr, int index, int x,
- int maxX));
+ TkTextTabArray *tabArrayPtr, int *indexPtr,
+ int x, int maxX));
static void TextInvalidateRegion _ANSI_ARGS_((TkText *textPtr,
TkRegion region));
static int TextCalculateDisplayLineHeight _ANSI_ARGS_((
@@ -1239,9 +1239,8 @@ LayoutDLine(textPtr, indexPtr)
AdjustForTab(textPtr, tabArrayPtr, tabIndex, tabChunkPtr);
x = chunkPtr->x + chunkPtr->width;
}
- tabIndex++;
tabChunkPtr = chunkPtr;
- tabSize = SizeOfTab(textPtr, tabArrayPtr, tabIndex, x, maxX);
+ tabSize = SizeOfTab(textPtr, tabArrayPtr, &tabIndex, x, maxX);
if ((maxX >= 0) && (tabSize >= maxX - x)) {
break;
}
@@ -6663,10 +6662,14 @@ AdjustForTab(textPtr, tabArrayPtr, index, chunkPtr)
*
* Results:
* The return value is the minimum number of pixels that will
- * be occupied by the index'th tab of tabArrayPtr, assuming that
+ * be occupied by the next 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.
+ * line is maxX. The 'next tab' is determined by a combination
+ * of the current position (x) which it must be equal to or
+ * beyond, and the tab count in indexPtr.
+ *
+ * For numeric tabs, this is a conservative estimate. The return
+ * value is always >= 0.
*
* Side effects:
* None.
@@ -6675,45 +6678,70 @@ AdjustForTab(textPtr, tabArrayPtr, index, chunkPtr)
*/
static int
-SizeOfTab(textPtr, tabArrayPtr, index, x, maxX)
+SizeOfTab(textPtr, tabArrayPtr, indexPtr, 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 *indexPtr; /* Contains index of previous tab
+ * stop, will be updated to
+ * reflect the number of stops
+ * used. */
+ int x; /* Current x-location in line. */
int maxX; /* X-location of pixel just past the
* right edge of the line. */
{
- int tabX, prev, result, spaceWidth;
+ int tabX, prev, result, index, spaceWidth;
TkTextTabAlign alignment;
-
+
if ((tabArrayPtr == NULL) || (tabArrayPtr->numTabs == 0)) {
tabX = NextTabStop(textPtr->tkfont, x, 0);
+ /*
+ * We used up one tab stop.
+ */
+ *indexPtr = (*indexPtr)+1;
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;
+ index = *indexPtr;
+ do {
+ /*
+ * We were given the count before this tabs, so increment it
+ * first.
+ */
+ index++;
+ if (index < tabArrayPtr->numTabs) {
+ tabX = tabArrayPtr->tabs[index].location;
+ alignment = tabArrayPtr->tabs[index].alignment;
} else {
- prev = 0;
+ /*
+ * 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;
}
- 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 this tab stop is before the current x position, then we
+ * must obviously continue until we reach the text tab stop.
+ */
+ } while (tabX < x);
+
+ /*
+ * Inform our caller of how many tab stops we've used up.
+ */
+ *indexPtr = index;
+
if (alignment == CENTER) {
/*
* Be very careful in the arithmetic below, because maxX may