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-rw-r--r--generic/tkListbox.c108
1 files changed, 104 insertions, 4 deletions
diff --git a/generic/tkListbox.c b/generic/tkListbox.c
index 1843bbb..f16218b 100644
--- a/generic/tkListbox.c
+++ b/generic/tkListbox.c
@@ -165,6 +165,8 @@ typedef struct {
Pixmap gray; /* Pixmap for displaying disabled text. */
int flags; /* Various flag bits: see below for
* definitions. */
+ Tk_Justify justify; /* Justification */
+ int oldMaxOffset; /* Used in scrolling for right/center justification */
} Listbox;
/*
@@ -308,6 +310,8 @@ static const Tk_OptionSpec optionSpecs[] = {
{TK_OPTION_STRING, "-listvariable", "listVariable", "Variable",
DEF_LISTBOX_LIST_VARIABLE, -1, Tk_Offset(Listbox, listVarName),
TK_OPTION_NULL_OK, 0, 0},
+ {TK_OPTION_JUSTIFY, "-justify", "justify", "Justify",
+ DEF_LISTBOX_JUSTIFY, -1, Tk_Offset(Listbox, justify), 0, 0, 0},
{TK_OPTION_END, NULL, NULL, NULL, NULL, 0, -1, 0, 0, 0}
};
@@ -436,6 +440,7 @@ static char * ListboxListVarProc(ClientData clientData,
const char *name2, int flags);
static void MigrateHashEntries(Tcl_HashTable *table,
int first, int last, int offset);
+static int GetMaxOffset(Listbox *listPtr);
/*
* The structure below defines button class behavior by means of procedures
@@ -546,6 +551,8 @@ Tk_ListboxObjCmd(
listPtr->cursor = None;
listPtr->state = STATE_NORMAL;
listPtr->gray = None;
+ listPtr->justify = TK_JUSTIFY_LEFT;
+ listPtr->oldMaxOffset = 0;
/*
* Keep a hold of the associated tkwin until we destroy the listbox,
@@ -572,6 +579,13 @@ Tk_ListboxObjCmd(
return TCL_ERROR;
}
+ if (listPtr->justify == TK_JUSTIFY_RIGHT) {
+ listPtr->xOffset = GetMaxOffset(listPtr);
+ } else if (listPtr->justify == TK_JUSTIFY_CENTER) {
+ listPtr->xOffset = GetMaxOffset(listPtr) / 2;
+ listPtr->xOffset -= listPtr->xOffset % listPtr->xScrollUnit;
+ }
+
Tcl_SetObjResult(interp, TkNewWindowObj(listPtr->tkwin));
return TCL_OK;
}
@@ -1111,7 +1125,7 @@ ListboxBboxSubCmd(
Tk_GetFontMetrics(listPtr->tkfont, &fm);
pixelWidth = Tk_TextWidth(listPtr->tkfont, stringRep, stringLen);
- x = listPtr->inset + listPtr->selBorderWidth - listPtr->xOffset;
+ x = listPtr->inset + listPtr->selBorderWidth - listPtr->xOffset;
y = ((index - listPtr->topIndex)*listPtr->lineHeight)
+ listPtr->inset + listPtr->selBorderWidth;
results[0] = Tcl_NewIntObj(x);
@@ -1838,6 +1852,7 @@ DisplayListbox(
* or right edge of the listbox is
* off-screen. */
Pixmap pixmap;
+ int totalLength, height;
listPtr->flags &= ~REDRAW_PENDING;
if (listPtr->flags & LISTBOX_DELETED) {
@@ -2056,12 +2071,22 @@ DisplayListbox(
/*
* Draw the actual text of this item.
*/
+ Tcl_ListObjIndex(listPtr->interp, listPtr->listObj, i, &curElement);
+ stringRep = Tcl_GetStringFromObj(curElement, &stringLen);
+ Tk_ComputeTextLayout(listPtr->tkfont,
+ stringRep, stringLen, 0,
+ listPtr->justify, TK_IGNORE_NEWLINES, &totalLength, &height);
Tk_GetFontMetrics(listPtr->tkfont, &fm);
y += fm.ascent + listPtr->selBorderWidth;
- x = listPtr->inset + listPtr->selBorderWidth - listPtr->xOffset;
- Tcl_ListObjIndex(listPtr->interp, listPtr->listObj, i, &curElement);
- stringRep = Tcl_GetStringFromObj(curElement, &stringLen);
+
+ if (listPtr->justify == TK_JUSTIFY_LEFT) {
+ x = listPtr->inset + listPtr->selBorderWidth - listPtr->xOffset;
+ } else if (listPtr->justify == TK_JUSTIFY_RIGHT) {
+ x = width - totalLength - listPtr->inset - listPtr->selBorderWidth - listPtr->xOffset + GetMaxOffset(listPtr) - 1;
+ } else {
+ x = (width + GetMaxOffset(listPtr))/2 - totalLength/2 - listPtr->xOffset;
+ }
Tk_DrawChars(listPtr->display, pixmap, gc, listPtr->tkfont,
stringRep, stringLen, x, y);
@@ -2582,6 +2607,7 @@ ListboxEventProc(
ClientData clientData, /* Information about window. */
XEvent *eventPtr) /* Information about event. */
{
+ int tmpOffset, tmpOffset2, maxOffset;
Listbox *listPtr = clientData;
if (eventPtr->type == Expose) {
@@ -2613,6 +2639,53 @@ ListboxEventProc(
}
listPtr->flags |= UPDATE_V_SCROLLBAR|UPDATE_H_SCROLLBAR;
ChangeListboxView(listPtr, listPtr->topIndex);
+ if (listPtr->justify == TK_JUSTIFY_RIGHT) {
+ maxOffset = GetMaxOffset(listPtr);
+ if (maxOffset != listPtr->oldMaxOffset && listPtr->oldMaxOffset > 0) { // window has shrunk
+ if (maxOffset > listPtr->oldMaxOffset) {
+ tmpOffset = maxOffset - listPtr->oldMaxOffset;
+ } else {
+ tmpOffset = listPtr->oldMaxOffset - maxOffset;
+ }
+ tmpOffset -= tmpOffset % listPtr->xScrollUnit;
+ if ((tmpOffset + listPtr->xOffset) > maxOffset) {
+ tmpOffset = maxOffset - listPtr->xOffset;
+ }
+ if (tmpOffset < 0) {
+ tmpOffset = 0;
+ }
+ listPtr->xOffset += tmpOffset;
+ } else {
+ listPtr->xOffset = maxOffset;
+ }
+ listPtr->oldMaxOffset = maxOffset;
+ } else if (listPtr->justify == TK_JUSTIFY_CENTER) {
+ maxOffset = GetMaxOffset(listPtr);
+ if (maxOffset != listPtr->oldMaxOffset && listPtr->oldMaxOffset > 0) { // window has shrunk
+ tmpOffset2 = maxOffset / 2;
+ if (maxOffset > listPtr->oldMaxOffset) {
+ tmpOffset = maxOffset/2 - listPtr->oldMaxOffset/2;
+ } else {
+ tmpOffset = listPtr->oldMaxOffset/2 - maxOffset/2;
+ }
+ tmpOffset -= tmpOffset % listPtr->xScrollUnit;
+ if ((tmpOffset + listPtr->xOffset) > maxOffset) {
+ tmpOffset = maxOffset - listPtr->xOffset;
+ }
+ if (tmpOffset < 0) {
+ tmpOffset = 0;
+ }
+ if (listPtr->xOffset < tmpOffset2) {
+ listPtr->xOffset += tmpOffset;
+ } else {
+ listPtr->xOffset -= tmpOffset;
+ }
+ } else {
+ listPtr->xOffset = maxOffset/2;
+ listPtr->xOffset -= listPtr->xOffset % listPtr->xScrollUnit;
+ }
+ listPtr->oldMaxOffset = maxOffset;
+ }
ChangeListboxOffset(listPtr, listPtr->xOffset);
/*
@@ -3584,6 +3657,33 @@ MigrateHashEntries(
}
/*
+ *----------------------------------------------------------------------
+ *
+ * GetMaxOffset --
+ *
+ * Passing in a listbox pointer, returns the maximum offset for the box
+ *
+ * Results:
+ * Listbox's maxOffset
+ *
+ * Side effects:
+ * None
+ *
+ *----------------------------------------------------------------------
+*/
+static int GetMaxOffset(register Listbox *listPtr)
+{
+ int maxOffset;
+
+ maxOffset = listPtr->maxWidth - (Tk_Width(listPtr->tkwin) - 2*listPtr->inset - 2*listPtr->selBorderWidth) + listPtr->xScrollUnit - 1;
+ if (maxOffset < 0) {
+ maxOffset = 0;
+ }
+ maxOffset -= maxOffset % listPtr->xScrollUnit;
+
+ return maxOffset;
+}
+/*
* Local Variables:
* mode: c
* c-basic-offset: 4
generated by cgit v0.12 at 2024-11-16 00:07:04 (GMT)