diff options
Diffstat (limited to 'generic/tkListbox.c')
| -rw-r--r-- | generic/tkListbox.c | 110 |
1 files changed, 87 insertions, 23 deletions
diff --git a/generic/tkListbox.c b/generic/tkListbox.c index 95f7862..c7effdd 100644 --- a/generic/tkListbox.c +++ b/generic/tkListbox.c @@ -90,14 +90,14 @@ typedef struct { * display. */ int topIndex; /* Index of top-most element visible in * window. */ - int fullLines; /* Number of lines that fit are completely + int fullLines; /* Number of lines that are completely * visible in window. There may be one * additional line at the bottom that is * partially visible. */ int partialLine; /* 0 means that the window holds exactly * fullLines lines. 1 means that there is one * additional line that is partially - * visble. */ + * visible. */ int setGrid; /* Non-zero means pass gridding information to * window manager. */ @@ -114,7 +114,8 @@ typedef struct { int xOffset; /* The left edge of each string in the listbox * is offset to the left by this many pixels * (0 means no offset, positive means there is - * an offset). */ + * an offset). This is x scrolling information + * is not linked to justification. */ /* * Information about what's selected or active, if any. @@ -131,7 +132,7 @@ typedef struct { int active; /* Index of "active" element (the one that has * been selected by keyboard traversal). -1 * means none. */ - int activeStyle; /* style in which to draw the active element. + int activeStyle; /* Style in which to draw the active element. * One of: underline, none, dotbox */ /* @@ -165,6 +166,7 @@ typedef struct { Pixmap gray; /* Pixmap for displaying disabled text. */ int flags; /* Various flag bits: see below for * definitions. */ + Tk_Justify justify; /* Justification. */ } Listbox; /* @@ -197,7 +199,7 @@ typedef struct { * be updated. * GOT_FOCUS: Non-zero means this widget currently has the * input focus. - * MAXWIDTH_IS_STALE: Stored maxWidth may be out-of-date + * MAXWIDTH_IS_STALE: Stored maxWidth may be out-of-date. * LISTBOX_DELETED: This listbox has been effectively destroyed. */ @@ -275,6 +277,8 @@ static const Tk_OptionSpec optionSpecs[] = { {TK_OPTION_PIXELS, "-highlightthickness", "highlightThickness", "HighlightThickness", DEF_LISTBOX_HIGHLIGHT_WIDTH, -1, Tk_Offset(Listbox, highlightWidth), 0, 0, 0}, + {TK_OPTION_JUSTIFY, "-justify", "justify", "Justify", + DEF_LISTBOX_JUSTIFY, -1, Tk_Offset(Listbox, justify), 0, 0, 0}, {TK_OPTION_RELIEF, "-relief", "relief", "Relief", DEF_LISTBOX_RELIEF, -1, Tk_Offset(Listbox, relief), 0, 0, 0}, {TK_OPTION_BORDER, "-selectbackground", "selectBackground", "Foreground", @@ -313,7 +317,7 @@ static const Tk_OptionSpec optionSpecs[] = { /* * The itemAttrOptionSpecs table defines the valid configuration options for - * listbox items + * listbox items. */ static const Tk_OptionSpec itemAttrOptionSpecs[] = { @@ -340,7 +344,7 @@ static const Tk_OptionSpec itemAttrOptionSpecs[] = { }; /* - * The following tables define the listbox widget commands (and sub- commands) + * The following tables define the listbox widget commands (and sub-commands) * and map the indexes into the string tables into enumerated types used to * dispatch the listbox widget command. */ @@ -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 +551,7 @@ Tk_ListboxObjCmd( listPtr->cursor = None; listPtr->state = STATE_NORMAL; listPtr->gray = None; + listPtr->justify = TK_JUSTIFY_LEFT; /* * Keep a hold of the associated tkwin until we destroy the listbox, @@ -613,7 +619,7 @@ ListboxWidgetObjCmd( /* * Parse the command by looking up the second argument in the list of - * valid subcommand names + * valid subcommand names. */ result = Tcl_GetIndexFromObj(interp, objv[1], commandNames, @@ -1076,6 +1082,7 @@ ListboxBboxSubCmd( Listbox *listPtr, /* Information about the listbox */ int index) /* Index of the element to get bbox info on */ { + register Tk_Window tkwin = listPtr->tkwin; int lastVisibleIndex; /* @@ -1111,7 +1118,15 @@ ListboxBboxSubCmd( Tk_GetFontMetrics(listPtr->tkfont, &fm); pixelWidth = Tk_TextWidth(listPtr->tkfont, stringRep, stringLen); - x = listPtr->inset + listPtr->selBorderWidth - listPtr->xOffset; + if (listPtr->justify == TK_JUSTIFY_LEFT) { + x = (listPtr->inset + listPtr->selBorderWidth) - listPtr->xOffset; + } else if (listPtr->justify == TK_JUSTIFY_RIGHT) { + x = Tk_Width(tkwin) - (listPtr->inset + listPtr->selBorderWidth) + - pixelWidth - listPtr->xOffset + GetMaxOffset(listPtr); + } else { + x = (Tk_Width(tkwin) - pixelWidth)/2 + - listPtr->xOffset + GetMaxOffset(listPtr)/2; + } y = ((index - listPtr->topIndex)*listPtr->lineHeight) + listPtr->inset + listPtr->selBorderWidth; results[0] = Tcl_NewIntObj(x); @@ -1837,6 +1852,7 @@ DisplayListbox( * or right edge of the listbox is * off-screen. */ Pixmap pixmap; + int textWidth; listPtr->flags &= ~REDRAW_PENDING; if (listPtr->flags & LISTBOX_DELETED) { @@ -2016,7 +2032,7 @@ DisplayListbox( } else { /* * If there is an item attributes record for this item, draw - * the background box and set the foreground color accordingly + * the background box and set the foreground color accordingly. */ if (entry != NULL) { @@ -2056,12 +2072,24 @@ DisplayListbox( * Draw the actual text of this item. */ + Tcl_ListObjIndex(listPtr->interp, listPtr->listObj, i, &curElement); + stringRep = Tcl_GetStringFromObj(curElement, &stringLen); + textWidth = Tk_TextWidth(listPtr->tkfont, stringRep, stringLen); + 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); - Tk_DrawChars(listPtr->display, pixmap, gc, listPtr->tkfont, + + if (listPtr->justify == TK_JUSTIFY_LEFT) { + x = (listPtr->inset + listPtr->selBorderWidth) - listPtr->xOffset; + } else if (listPtr->justify == TK_JUSTIFY_RIGHT) { + x = Tk_Width(tkwin) - (listPtr->inset + listPtr->selBorderWidth) + - textWidth - listPtr->xOffset + GetMaxOffset(listPtr); + } else { + x = (Tk_Width(tkwin) - textWidth)/2 + - listPtr->xOffset + GetMaxOffset(listPtr)/2; + } + + Tk_DrawChars(listPtr->display, pixmap, gc, listPtr->tkfont, stringRep, stringLen, x, y); /* @@ -2458,7 +2486,7 @@ ListboxDeleteSubCmd( /* * Check width of the element. We only have to check if widthChanged * has not already been set to 1, because we only need one maxWidth - * element to disappear for us to have to recompute the width + * element to disappear for us to have to recompute the width. */ if (widthChanged == 0) { @@ -2735,7 +2763,11 @@ GetListboxIndex( stringRep = Tcl_GetString(indexObj); if (stringRep[0] == '@') { - /* @x,y index */ + + /* + * @x,y index + */ + int y; const char *start; char *end; @@ -2844,9 +2876,7 @@ ChangeListboxOffset( */ offset += listPtr->xScrollUnit / 2; - maxOffset = listPtr->maxWidth - (Tk_Width(listPtr->tkwin) - - 2*listPtr->inset - 2*listPtr->selBorderWidth) - + listPtr->xScrollUnit - 1; + maxOffset = GetMaxOffset(listPtr); if (offset > maxOffset) { offset = maxOffset; } @@ -2887,9 +2917,7 @@ ListboxScanTo( int newTopIndex, newOffset, maxIndex, maxOffset; maxIndex = listPtr->nElements - listPtr->fullLines; - maxOffset = listPtr->maxWidth + (listPtr->xScrollUnit - 1) - - (Tk_Width(listPtr->tkwin) - 2*listPtr->inset - - 2*listPtr->selBorderWidth - listPtr->xScrollUnit); + maxOffset = GetMaxOffset(listPtr); /* * Compute new top line for screen by amplifying the difference between @@ -3465,7 +3493,7 @@ ListboxListVarProc( /* * If the list length has decreased, then we should clean up selection and - * attributes information for elements past the end of the new list + * attributes information for elements past the end of the new list. */ oldLength = listPtr->nElements; @@ -3583,6 +3611,42 @@ MigrateHashEntries( } /* + *---------------------------------------------------------------------- + * + * GetMaxOffset -- + * + * Passing in a listbox pointer, returns the maximum offset for the box, + * i.e. the maximum possible horizontal scrolling value (in pixels). + * + * 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) { + + /* + * Listbox is larger in width than its largest width item. + */ + + maxOffset = 0; + } + maxOffset -= maxOffset % listPtr->xScrollUnit; + + return maxOffset; +} +/* * Local Variables: * mode: c * c-basic-offset: 4 |