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stk/Tk/generic/tkListbox.c

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/*
* tkListbox.c --
*
* This module implements listbox widgets for the Tk
* toolkit. A listbox displays a collection of strings,
* one per line, and provides scrolling and selection.
*
* Copyright (c) 1990-1994 The Regents of the University of California.
* Copyright (c) 1994-1997 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: @(#) tkListbox.c 1.120 97/10/29 13:06:59
*/
#include "tkPort.h"
#include "default.h"
#include "tkInt.h"
#ifdef BGLK_CODE
# define STk_stringify_result SCM_stringify_result
# define STk_stringify SCM_stringify
#endif
/*
* One record of the following type is kept for each element
* associated with a listbox widget:
*/
typedef struct Element {
int textLength; /* # non-NULL characters in text. */
int lBearing; /* Distance from first character's
* origin to left edge of character. */
int pixelWidth; /* Total width of element in pixels (including
* left bearing and right bearing). */
int selected; /* 1 means this item is selected, 0 means
* it isn't. */
struct Element *nextPtr; /* Next in list of all elements of this
* listbox, or NULL for last element. */
char text[4]; /* Characters of this element, NULL-
* terminated. The actual space allocated
* here will be as large as needed (> 4,
* most likely). Must be the last field
* of the record. */
} Element;
#define ElementSize(stringLength) \
((unsigned) (sizeof(Element) - 3 + stringLength))
/*
* A data structure of the following type is kept for each listbox
* widget managed by this file:
*/
typedef struct {
Tk_Window tkwin; /* Window that embodies the listbox. NULL
* means that the window has been destroyed
* but the data structures haven't yet been
* cleaned up.*/
Display *display; /* Display containing widget. Used, among
* other things, so that resources can be
* freed even after tkwin has gone away. */
Tcl_Interp *interp; /* Interpreter associated with listbox. */
Tcl_Command widgetCmd; /* Token for listbox's widget command. */
int numElements; /* Total number of elements in this listbox. */
Element *firstPtr; /* First in list of elements (NULL if no
* elements). */
Element *lastPtr; /* Last in list of elements (NULL if no
* elements). */
/*
* Information used when displaying widget:
*/
Tk_3DBorder normalBorder; /* Used for drawing border around whole
* window, plus used for background. */
int borderWidth; /* Width of 3-D border around window. */
int relief; /* 3-D effect: TK_RELIEF_RAISED, etc. */
int highlightWidth; /* Width in pixels of highlight to draw
* around widget when it has the focus.
* <= 0 means don't draw a highlight. */
XColor *highlightBgColorPtr;
/* Color for drawing traversal highlight
* area when highlight is off. */
XColor *highlightColorPtr; /* Color for drawing traversal highlight. */
int inset; /* Total width of all borders, including
* traversal highlight and 3-D border.
* Indicates how much interior stuff must
* be offset from outside edges to leave
* room for borders. */
Tk_Font tkfont; /* Information about text font, or NULL. */
XColor *fgColorPtr; /* Text color in normal mode. */
GC textGC; /* For drawing normal text. */
Tk_3DBorder selBorder; /* Borders and backgrounds for selected
* elements. */
int selBorderWidth; /* Width of border around selection. */
XColor *selFgColorPtr; /* Foreground color for selected elements. */
GC selTextGC; /* For drawing selected text. */
int width; /* Desired width of window, in characters. */
int height; /* Desired height of window, in lines. */
int lineHeight; /* Number of pixels allocated for each line
* in display. */
int topIndex; /* Index of top-most element visible in
* window. */
int fullLines; /* Number of lines that fit 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. */
int setGrid; /* Non-zero means pass gridding information
* to window manager. */
/*
* Information to support horizontal scrolling:
*/
int maxWidth; /* Width (in pixels) of widest string in
* listbox. */
int xScrollUnit; /* Number of pixels in one "unit" for
* horizontal scrolling (window scrolls
* horizontally in increments of this size).
* This is an average character size. */
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). */
/*
* Information about what's selected or active, if any.
*/
Tk_Uid selectMode; /* Selection style: single, browse, multiple,
* or extended. This value isn't used in C
* code, but the Tcl bindings use it. */
int numSelected; /* Number of elements currently selected. */
int selectAnchor; /* Fixed end of selection (i.e. element
* at which selection was started.) */
int exportSelection; /* Non-zero means tie internal listbox
* to X selection. */
int active; /* Index of "active" element (the one that
* has been selected by keyboard traversal).
* -1 means none. */
/*
* Information for scanning:
*/
int scanMarkX; /* X-position at which scan started (e.g.
* button was pressed here). */
int scanMarkY; /* Y-position at which scan started (e.g.
* button was pressed here). */
int scanMarkXOffset; /* Value of "xOffset" field when scan
* started. */
int scanMarkYIndex; /* Index of line that was at top of window
* when scan started. */
/*
* Miscellaneous information:
*/
Tk_Cursor cursor; /* Current cursor for window, or None. */
char *takeFocus; /* Value of -takefocus option; not used in
* the C code, but used by keyboard traversal
* scripts. Malloc'ed, but may be NULL. */
char *yScrollCmd; /* Command prefix for communicating with
* vertical scrollbar. NULL means no command
* to issue. Malloc'ed. */
char *xScrollCmd; /* Command prefix for communicating with
* horizontal scrollbar. NULL means no command
* to issue. Malloc'ed. */
int flags; /* Various flag bits: see below for
* definitions. */
} Listbox;
/*
* Flag bits for listboxes:
*
* REDRAW_PENDING: Non-zero means a DoWhenIdle handler
* has already been queued to redraw
* this window.
* UPDATE_V_SCROLLBAR: Non-zero means vertical scrollbar needs
* to be updated.
* UPDATE_H_SCROLLBAR: Non-zero means horizontal scrollbar needs
* to be updated.
* GOT_FOCUS: Non-zero means this widget currently
* has the input focus.
*/
#define REDRAW_PENDING 1
#define UPDATE_V_SCROLLBAR 2
#define UPDATE_H_SCROLLBAR 4
#define GOT_FOCUS 8
/*
* Information used for argv parsing:
*/
static Tk_ConfigSpec configSpecs[] = {
{TK_CONFIG_BORDER, "-background", "background", "Background",
DEF_LISTBOX_BG_COLOR, Tk_Offset(Listbox, normalBorder),
TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_BORDER, "-background", "background", "Background",
DEF_LISTBOX_BG_MONO, Tk_Offset(Listbox, normalBorder),
TK_CONFIG_MONO_ONLY},
{TK_CONFIG_SYNONYM, "-bd", "borderWidth", (char *) NULL,
(char *) NULL, 0, 0},
{TK_CONFIG_SYNONYM, "-bg", "background", (char *) NULL,
(char *) NULL, 0, 0},
{TK_CONFIG_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
DEF_LISTBOX_BORDER_WIDTH, Tk_Offset(Listbox, borderWidth), 0},
{TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor",
DEF_LISTBOX_CURSOR, Tk_Offset(Listbox, cursor), TK_CONFIG_NULL_OK},
{TK_CONFIG_BOOLEAN, "-exportselection", "exportSelection",
"ExportSelection", DEF_LISTBOX_EXPORT_SELECTION,
Tk_Offset(Listbox, exportSelection), 0},
{TK_CONFIG_SYNONYM, "-fg", "foreground", (char *) NULL,
(char *) NULL, 0, 0},
{TK_CONFIG_FONT, "-font", "font", "Font",
DEF_LISTBOX_FONT, Tk_Offset(Listbox, tkfont), 0},
{TK_CONFIG_COLOR, "-foreground", "foreground", "Foreground",
DEF_LISTBOX_FG, Tk_Offset(Listbox, fgColorPtr), 0},
{TK_CONFIG_INT, "-height", "height", "Height",
DEF_LISTBOX_HEIGHT, Tk_Offset(Listbox, height), 0},
{TK_CONFIG_COLOR, "-highlightbackground", "highlightBackground",
"HighlightBackground", DEF_LISTBOX_HIGHLIGHT_BG,
Tk_Offset(Listbox, highlightBgColorPtr), 0},
{TK_CONFIG_COLOR, "-highlightcolor", "highlightColor", "HighlightColor",
DEF_LISTBOX_HIGHLIGHT, Tk_Offset(Listbox, highlightColorPtr), 0},
{TK_CONFIG_PIXELS, "-highlightthickness", "highlightThickness",
"HighlightThickness",
DEF_LISTBOX_HIGHLIGHT_WIDTH, Tk_Offset(Listbox, highlightWidth), 0},
{TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
DEF_LISTBOX_RELIEF, Tk_Offset(Listbox, relief), 0},
{TK_CONFIG_BORDER, "-selectbackground", "selectBackground", "Foreground",
DEF_LISTBOX_SELECT_COLOR, Tk_Offset(Listbox, selBorder),
TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_BORDER, "-selectbackground", "selectBackground", "Foreground",
DEF_LISTBOX_SELECT_MONO, Tk_Offset(Listbox, selBorder),
TK_CONFIG_MONO_ONLY},
{TK_CONFIG_PIXELS, "-selectborderwidth", "selectBorderWidth", "BorderWidth",
DEF_LISTBOX_SELECT_BD, Tk_Offset(Listbox, selBorderWidth), 0},
{TK_CONFIG_COLOR, "-selectforeground", "selectForeground", "Background",
DEF_LISTBOX_SELECT_FG_COLOR, Tk_Offset(Listbox, selFgColorPtr),
TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_COLOR, "-selectforeground", "selectForeground", "Background",
DEF_LISTBOX_SELECT_FG_MONO, Tk_Offset(Listbox, selFgColorPtr),
TK_CONFIG_MONO_ONLY},
{TK_CONFIG_UID, "-selectmode", "selectMode", "SelectMode",
DEF_LISTBOX_SELECT_MODE, Tk_Offset(Listbox, selectMode), 0},
{TK_CONFIG_BOOLEAN, "-setgrid", "setGrid", "SetGrid",
DEF_LISTBOX_SET_GRID, Tk_Offset(Listbox, setGrid), 0},
#ifdef SCM_CODE
{TK_CONFIG_CLOSURE, "-takefocus", "takeFocus", "TakeFocus",
#else
{TK_CONFIG_STRING, "-takefocus", "takeFocus", "TakeFocus",
#endif
DEF_LISTBOX_TAKE_FOCUS, Tk_Offset(Listbox, takeFocus),
TK_CONFIG_NULL_OK},
{TK_CONFIG_INT, "-width", "width", "Width",
DEF_LISTBOX_WIDTH, Tk_Offset(Listbox, width), 0},
#ifdef SCM_CODE
{TK_CONFIG_CLOSURE, "-xscrollcommand", "xScrollCommand", "ScrollCommand",
#else
{TK_CONFIG_STRING, "-xscrollcommand", "xScrollCommand", "ScrollCommand",
#endif
DEF_LISTBOX_SCROLL_COMMAND, Tk_Offset(Listbox, xScrollCmd),
TK_CONFIG_NULL_OK},
#ifdef SCM_CODE
{TK_CONFIG_CLOSURE, "-yscrollcommand", "yScrollCommand", "ScrollCommand",
#else
{TK_CONFIG_STRING, "-yscrollcommand", "yScrollCommand", "ScrollCommand",
#endif
DEF_LISTBOX_SCROLL_COMMAND, Tk_Offset(Listbox, yScrollCmd),
TK_CONFIG_NULL_OK},
{TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
(char *) NULL, 0, 0}
};
/*
* Forward declarations for procedures defined later in this file:
*/
static void ChangeListboxOffset _ANSI_ARGS_((Listbox *listPtr,
int offset));
static void ChangeListboxView _ANSI_ARGS_((Listbox *listPtr,
int index));
static int ConfigureListbox _ANSI_ARGS_((Tcl_Interp *interp,
Listbox *listPtr, int argc, char **argv,
int flags));
static void DeleteEls _ANSI_ARGS_((Listbox *listPtr, int first,
int last));
static void DestroyListbox _ANSI_ARGS_((char *memPtr));
static void DisplayListbox _ANSI_ARGS_((ClientData clientData));
static int GetListboxIndex _ANSI_ARGS_((Tcl_Interp *interp,
Listbox *listPtr, char *string, int endIsSize,
int *indexPtr));
static void InsertEls _ANSI_ARGS_((Listbox *listPtr, int index,
int argc, char **argv));
static void ListboxCmdDeletedProc _ANSI_ARGS_((
ClientData clientData));
static void ListboxComputeGeometry _ANSI_ARGS_((Listbox *listPtr,
int fontChanged, int maxIsStale, int updateGrid));
static void ListboxEventProc _ANSI_ARGS_((ClientData clientData,
XEvent *eventPtr));
static int ListboxFetchSelection _ANSI_ARGS_((
ClientData clientData, int offset, char *buffer,
int maxBytes));
static void ListboxLostSelection _ANSI_ARGS_((
ClientData clientData));
static void ListboxRedrawRange _ANSI_ARGS_((Listbox *listPtr,
int first, int last));
static void ListboxScanTo _ANSI_ARGS_((Listbox *listPtr,
int x, int y));
static void ListboxSelect _ANSI_ARGS_((Listbox *listPtr,
int first, int last, int select));
static void ListboxUpdateHScrollbar _ANSI_ARGS_((Listbox *listPtr));
static void ListboxUpdateVScrollbar _ANSI_ARGS_((Listbox *listPtr));
static int ListboxWidgetCmd _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *interp, int argc, char **argv));
static void ListboxWorldChanged _ANSI_ARGS_((
ClientData instanceData));
static int NearestListboxElement _ANSI_ARGS_((Listbox *listPtr,
int y));
/*
* The structure below defines button class behavior by means of procedures
* that can be invoked from generic window code.
*/
static TkClassProcs listboxClass = {
NULL, /* createProc. */
ListboxWorldChanged, /* geometryProc. */
NULL /* modalProc. */
};
/*
*--------------------------------------------------------------
*
* Tk_ListboxCmd --
*
* This procedure is invoked to process the "listbox" Tcl
* command. See the user documentation for details on what
* it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*--------------------------------------------------------------
*/
int
Tk_ListboxCmd(clientData, interp, argc, argv)
ClientData clientData; /* Main window associated with
* interpreter. */
Tcl_Interp *interp; /* Current interpreter. */
int argc; /* Number of arguments. */
char **argv; /* Argument strings. */
{
register Listbox *listPtr;
Tk_Window new;
Tk_Window tkwin = (Tk_Window) clientData;
if (argc < 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " pathName ?options?\"", (char *) NULL);
return TCL_ERROR;
}
new = Tk_CreateWindowFromPath(interp, tkwin, argv[1], (char *) NULL);
if (new == NULL) {
return TCL_ERROR;
}
/*
* Initialize the fields of the structure that won't be initialized
* by ConfigureListbox, or that ConfigureListbox requires to be
* initialized already (e.g. resource pointers).
*/
listPtr = (Listbox *) ckalloc(sizeof(Listbox));
listPtr->tkwin = new;
listPtr->display = Tk_Display(new);
listPtr->interp = interp;
listPtr->widgetCmd = Tcl_CreateCommand(interp,
Tk_PathName(listPtr->tkwin), ListboxWidgetCmd,
(ClientData) listPtr, ListboxCmdDeletedProc);
listPtr->numElements = 0;
listPtr->firstPtr = NULL;
listPtr->lastPtr = NULL;
listPtr->normalBorder = NULL;
listPtr->borderWidth = 0;
listPtr->relief = TK_RELIEF_RAISED;
listPtr->highlightWidth = 0;
listPtr->highlightBgColorPtr = NULL;
listPtr->highlightColorPtr = NULL;
listPtr->inset = 0;
listPtr->tkfont = NULL;
listPtr->fgColorPtr = NULL;
listPtr->textGC = None;
listPtr->selBorder = NULL;
listPtr->selBorderWidth = 0;
listPtr->selFgColorPtr = None;
listPtr->selTextGC = None;
listPtr->width = 0;
listPtr->height = 0;
listPtr->lineHeight = 0;
listPtr->topIndex = 0;
listPtr->fullLines = 1;
listPtr->partialLine = 0;
listPtr->setGrid = 0;
listPtr->maxWidth = 0;
listPtr->xScrollUnit = 1;
listPtr->xOffset = 0;
listPtr->selectMode = NULL;
listPtr->numSelected = 0;
listPtr->selectAnchor = 0;
listPtr->exportSelection = 1;
listPtr->active = 0;
listPtr->scanMarkX = 0;
listPtr->scanMarkY = 0;
listPtr->scanMarkXOffset = 0;
listPtr->scanMarkYIndex = 0;
listPtr->cursor = None;
listPtr->takeFocus = NULL;
listPtr->xScrollCmd = NULL;
listPtr->yScrollCmd = NULL;
listPtr->flags = 0;
Tk_SetClass(listPtr->tkwin, "Listbox");
TkSetClassProcs(listPtr->tkwin, &listboxClass, (ClientData) listPtr);
Tk_CreateEventHandler(listPtr->tkwin,
ExposureMask|StructureNotifyMask|FocusChangeMask,
ListboxEventProc, (ClientData) listPtr);
Tk_CreateSelHandler(listPtr->tkwin, XA_PRIMARY, XA_STRING,
ListboxFetchSelection, (ClientData) listPtr, XA_STRING);
if (ConfigureListbox(interp, listPtr, argc-2, argv+2, 0) != TCL_OK) {
goto error;
}
#ifdef STk_CODE
STk_sharp_dot_result(interp, Tk_PathName(listPtr->tkwin));
#else
interp->result = Tk_PathName(listPtr->tkwin);
#endif
return TCL_OK;
error:
Tk_DestroyWindow(listPtr->tkwin);
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* ListboxWidgetCmd --
*
* This procedure is invoked to process the Tcl command
* that corresponds to a widget managed by this module.
* See the user documentation for details on what it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*--------------------------------------------------------------
*/
static int
ListboxWidgetCmd(clientData, interp, argc, argv)
ClientData clientData; /* Information about listbox widget. */
Tcl_Interp *interp; /* Current interpreter. */
int argc; /* Number of arguments. */
char **argv; /* Argument strings. */
{
register Listbox *listPtr = (Listbox *) clientData;
int result = TCL_OK;
size_t length;
int c;
Tk_FontMetrics fm;
if (argc < 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " option ?arg arg ...?\"", (char *) NULL);
return TCL_ERROR;
}
Tcl_Preserve((ClientData) listPtr);
c = argv[1][0];
length = strlen(argv[1]);
if ((c == 'a') && (strncmp(argv[1], "activate", length) == 0)) {
int index;
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " activate index\"",
(char *) NULL);
goto error;
}
ListboxRedrawRange(listPtr, listPtr->active, listPtr->active);
if (GetListboxIndex(interp, listPtr, argv[2], 0, &index) != TCL_OK) {
goto error;
}
if (index >= listPtr->numElements) {
index = listPtr->numElements-1;
}
if (index < 0) {
index = 0;
}
listPtr->active = index;
ListboxRedrawRange(listPtr, listPtr->active, listPtr->active);
} else if ((c == 'b') && (strncmp(argv[1], "bbox", length) == 0)) {
int index, x, y, i;
Element *elPtr;
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " bbox index\"", (char *) NULL);
goto error;
}
if (GetListboxIndex(interp, listPtr, argv[2], 0, &index) != TCL_OK) {
goto error;
}
if ((index >= listPtr->numElements) || (index < 0)) {
goto done;
}
for (i = 0, elPtr = listPtr->firstPtr; i < index;
i++, elPtr = elPtr->nextPtr) {
/* Empty loop body. */
}
if ((index >= listPtr->topIndex) && (index < listPtr->numElements)
&& (index < (listPtr->topIndex + listPtr->fullLines
+ listPtr->partialLine))) {
x = listPtr->inset + listPtr->selBorderWidth - listPtr->xOffset;
y = ((index - listPtr->topIndex)*listPtr->lineHeight)
+ listPtr->inset + listPtr->selBorderWidth;
Tk_GetFontMetrics(listPtr->tkfont, &fm);
sprintf(interp->result, "%d %d %d %d", x, y, elPtr->pixelWidth,
fm.linespace);
}
} else if ((c == 'c') && (strncmp(argv[1], "cget", length) == 0)
&& (length >= 2)) {
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " cget option\"",
(char *) NULL);
goto error;
}
result = Tk_ConfigureValue(interp, listPtr->tkwin, configSpecs,
(char *) listPtr, argv[2], 0);
} else if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)
&& (length >= 2)) {
if (argc == 2) {
result = Tk_ConfigureInfo(interp, listPtr->tkwin, configSpecs,
(char *) listPtr, (char *) NULL, 0);
} else if (argc == 3) {
result = Tk_ConfigureInfo(interp, listPtr->tkwin, configSpecs,
(char *) listPtr, argv[2], 0);
} else {
result = ConfigureListbox(interp, listPtr, argc-2, argv+2,
TK_CONFIG_ARGV_ONLY);
}
} else if ((c == 'c') && (strncmp(argv[1], "curselection", length) == 0)
&& (length >= 2)) {
int i, count;
char index[20];
Element *elPtr;
if (argc != 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " curselection\"",
(char *) NULL);
goto error;
}
#ifdef SCM_CODE
Tcl_AppendResult(interp, "(", NULL);
#endif
count = 0;
for (i = 0, elPtr = listPtr->firstPtr; elPtr != NULL;
i++, elPtr = elPtr->nextPtr) {
if (elPtr->selected) {
sprintf(index, "%d", i);
Tcl_AppendElement(interp, index);
count++;
}
}
#ifdef SCM_CODE
Tcl_AppendResult(interp, ")", NULL);
#endif
if (count != listPtr->numSelected) {
panic("ListboxWidgetCmd: selection count incorrect");
}
} else if ((c == 'd') && (strncmp(argv[1], "delete", length) == 0)) {
int first, last;
if ((argc < 3) || (argc > 4)) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " delete firstIndex ?lastIndex?\"",
(char *) NULL);
goto error;
}
if (GetListboxIndex(interp, listPtr, argv[2], 0, &first) != TCL_OK) {
goto error;
}
if (first < listPtr->numElements) {
if (argc == 3) {
last = first;
} else {
if (GetListboxIndex(interp, listPtr, argv[3], 0,
&last) != TCL_OK) {
goto error;
}
if (last >= listPtr->numElements) {
last = listPtr->numElements-1;
}
}
DeleteEls(listPtr, first, last);
}
} else if ((c == 'g') && (strncmp(argv[1], "get", length) == 0)) {
int first, last, i;
Element *elPtr;
if ((argc != 3) && (argc != 4)) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " get first ?last?\"", (char *) NULL);
goto error;
}
if (GetListboxIndex(interp, listPtr, argv[2], 0, &first) != TCL_OK) {
goto error;
}
if ((argc == 4) && (GetListboxIndex(interp, listPtr, argv[3],
0, &last) != TCL_OK)) {
goto error;
}
if (first >= listPtr->numElements) {
goto done;
}
if (last >= listPtr->numElements) {
last = listPtr->numElements-1;
}
for (elPtr = listPtr->firstPtr, i = 0; i < first;
i++, elPtr = elPtr->nextPtr) {
/* Empty loop body. */
}
if (elPtr != NULL) {
#ifdef SCM_CODE
if (argc == 3) {
if (first >= 0) {
STk_stringify_result(interp, elPtr->text);
}
} else {
Tcl_AppendResult(interp, "(", NULL);
for ( ; i <= last; i++, elPtr = elPtr->nextPtr) {
Tcl_AppendResult(interp, " ",
STk_stringify(elPtr->text, 0), NULL);
}
Tcl_AppendResult(interp, ")", NULL);
}
#else
if (argc == 3) {
if (first >= 0) {
interp->result = elPtr->text;
}
} else {
for ( ; i <= last; i++, elPtr = elPtr->nextPtr) {
Tcl_AppendElement(interp, elPtr->text);
}
}
#endif
}
} else if ((c == 'i') && (strncmp(argv[1], "index", length) == 0)
&& (length >= 3)) {
int index;
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " index index\"",
(char *) NULL);
goto error;
}
if (GetListboxIndex(interp, listPtr, argv[2], 1, &index)
!= TCL_OK) {
goto error;
}
sprintf(interp->result, "%d", index);
} else if ((c == 'i') && (strncmp(argv[1], "insert", length) == 0)
&& (length >= 3)) {
int index;
if (argc < 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " insert index ?element element ...?\"",
(char *) NULL);
goto error;
}
if (GetListboxIndex(interp, listPtr, argv[2], 1, &index)
!= TCL_OK) {
goto error;
}
InsertEls(listPtr, index, argc-3, argv+3);
} else if ((c == 'n') && (strncmp(argv[1], "nearest", length) == 0)) {
int index, y;
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " nearest y\"", (char *) NULL);
goto error;
}
if (Tcl_GetInt(interp, argv[2], &y) != TCL_OK) {
goto error;
}
index = NearestListboxElement(listPtr, y);
sprintf(interp->result, "%d", index);
} else if ((c == 's') && (length >= 2)
&& (strncmp(argv[1], "scan", length) == 0)) {
int x, y;
if (argc != 5) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " scan mark|dragto x y\"", (char *) NULL);
goto error;
}
if ((Tcl_GetInt(interp, argv[3], &x) != TCL_OK)
|| (Tcl_GetInt(interp, argv[4], &y) != TCL_OK)) {
goto error;
}
if ((argv[2][0] == 'm')
&& (strncmp(argv[2], "mark", strlen(argv[2])) == 0)) {
listPtr->scanMarkX = x;
listPtr->scanMarkY = y;
listPtr->scanMarkXOffset = listPtr->xOffset;
listPtr->scanMarkYIndex = listPtr->topIndex;
} else if ((argv[2][0] == 'd')
&& (strncmp(argv[2], "dragto", strlen(argv[2])) == 0)) {
ListboxScanTo(listPtr, x, y);
} else {
Tcl_AppendResult(interp, "bad scan option \"", argv[2],
"\": must be mark or dragto", (char *) NULL);
goto error;
}
} else if ((c == 's') && (strncmp(argv[1], "see", length) == 0)
&& (length >= 3)) {
int index, diff;
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " see index\"",
(char *) NULL);
goto error;
}
if (GetListboxIndex(interp, listPtr, argv[2], 0, &index) != TCL_OK) {
goto error;
}
if (index >= listPtr->numElements) {
index = listPtr->numElements-1;
}
if (index < 0) {
index = 0;
}
diff = listPtr->topIndex-index;
if (diff > 0) {
if (diff <= (listPtr->fullLines/3)) {
ChangeListboxView(listPtr, index);
} else {
ChangeListboxView(listPtr, index - (listPtr->fullLines-1)/2);
}
} else {
diff = index - (listPtr->topIndex + listPtr->fullLines - 1);
if (diff > 0) {
if (diff <= (listPtr->fullLines/3)) {
ChangeListboxView(listPtr, listPtr->topIndex + diff);
} else {
ChangeListboxView(listPtr,
index - (listPtr->fullLines-1)/2);
}
}
}
} else if ((c == 's') && (length >= 3)
&& (strncmp(argv[1], "selection", length) == 0)) {
int first, last;
if ((argc != 4) && (argc != 5)) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " selection option index ?index?\"",
(char *) NULL);
goto error;
}
if (GetListboxIndex(interp, listPtr, argv[3], 0, &first) != TCL_OK) {
goto error;
}
if (argc == 5) {
if (GetListboxIndex(interp, listPtr, argv[4], 0, &last) != TCL_OK) {
goto error;
}
} else {
last = first;
}
length = strlen(argv[2]);
c = argv[2][0];
if ((c == 'a') && (strncmp(argv[2], "anchor", length) == 0)) {
if (argc != 4) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " selection anchor index\"", (char *) NULL);
goto error;
}
if (first >= listPtr->numElements) {
first = listPtr->numElements-1;
}
if (first < 0) {
first = 0;
}
listPtr->selectAnchor = first;
} else if ((c == 'c') && (strncmp(argv[2], "clear", length) == 0)) {
ListboxSelect(listPtr, first, last, 0);
} else if ((c == 'i') && (strncmp(argv[2], "includes", length) == 0)) {
int i;
Element *elPtr;
if (argc != 4) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " selection includes index\"", (char *) NULL);
goto error;
}
if ((first < 0) || (first >= listPtr->numElements)) {
interp->result = "0";
goto done;
}
for (elPtr = listPtr->firstPtr, i = 0; i < first;
i++, elPtr = elPtr->nextPtr) {
/* Empty loop body. */
}
#ifdef SCM_CODE
interp->result = (elPtr->selected) ? "#t" : "#f";
#else
if (elPtr->selected) {
interp->result = "1";
} else {
interp->result = "0";
}
#endif
} else if ((c == 's') && (strncmp(argv[2], "set", length) == 0)) {
ListboxSelect(listPtr, first, last, 1);
} else {
Tcl_AppendResult(interp, "bad selection option \"", argv[2],
"\": must be anchor, clear, includes, or set",
(char *) NULL);
goto error;
}
} else if ((c == 's') && (length >= 2)
&& (strncmp(argv[1], "size", length) == 0)) {
if (argc != 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " size\"", (char *) NULL);
goto error;
}
sprintf(interp->result, "%d", listPtr->numElements);
} else if ((c == 'x') && (strncmp(argv[1], "xview", length) == 0)) {
int index, count, type, windowWidth, windowUnits;
int offset = 0; /* Initialized to stop gcc warnings. */
double fraction, fraction2;
windowWidth = Tk_Width(listPtr->tkwin)
- 2*(listPtr->inset + listPtr->selBorderWidth);
if (argc == 2) {
if (listPtr->maxWidth == 0) {
interp->result = "0 1";
} else {
fraction = listPtr->xOffset/((double) listPtr->maxWidth);
fraction2 = (listPtr->xOffset + windowWidth)
/((double) listPtr->maxWidth);
if (fraction2 > 1.0) {
fraction2 = 1.0;
}
sprintf(interp->result, "%g %g", fraction, fraction2);
}
} else if (argc == 3) {
if (Tcl_GetInt(interp, argv[2], &index) != TCL_OK) {
goto error;
}
ChangeListboxOffset(listPtr, index*listPtr->xScrollUnit);
} else {
type = Tk_GetScrollInfo(interp, argc, argv, &fraction, &count);
switch (type) {
case TK_SCROLL_ERROR:
goto error;
case TK_SCROLL_MOVETO:
offset = (int) (fraction*listPtr->maxWidth + 0.5);
break;
case TK_SCROLL_PAGES:
windowUnits = windowWidth/listPtr->xScrollUnit;
if (windowUnits > 2) {
offset = listPtr->xOffset
+ count*listPtr->xScrollUnit*(windowUnits-2);
} else {
offset = listPtr->xOffset + count*listPtr->xScrollUnit;
}
break;
case TK_SCROLL_UNITS:
offset = listPtr->xOffset + count*listPtr->xScrollUnit;
break;
}
ChangeListboxOffset(listPtr, offset);
}
} else if ((c == 'y') && (strncmp(argv[1], "yview", length) == 0)) {
int index, count, type;
double fraction, fraction2;
if (argc == 2) {
if (listPtr->numElements == 0) {
interp->result = "0 1";
} else {
fraction = listPtr->topIndex/((double) listPtr->numElements);
fraction2 = (listPtr->topIndex+listPtr->fullLines)
/((double) listPtr->numElements);
if (fraction2 > 1.0) {
fraction2 = 1.0;
}
sprintf(interp->result, "%g %g", fraction, fraction2);
}
} else if (argc == 3) {
if (GetListboxIndex(interp, listPtr, argv[2], 0, &index)
!= TCL_OK) {
goto error;
}
ChangeListboxView(listPtr, index);
} else {
type = Tk_GetScrollInfo(interp, argc, argv, &fraction, &count);
switch (type) {
case TK_SCROLL_ERROR:
goto error;
case TK_SCROLL_MOVETO:
index = (int) (listPtr->numElements*fraction + 0.5);
break;
case TK_SCROLL_PAGES:
if (listPtr->fullLines > 2) {
index = listPtr->topIndex
+ count*(listPtr->fullLines-2);
} else {
index = listPtr->topIndex + count;
}
break;
case TK_SCROLL_UNITS:
index = listPtr->topIndex + count;
break;
}
ChangeListboxView(listPtr, index);
}
} else {
Tcl_AppendResult(interp, "bad option \"", argv[1],
"\": must be activate, bbox, cget, configure, ",
"curselection, delete, get, index, insert, nearest, ",
"scan, see, selection, size, ",
"xview, or yview", (char *) NULL);
goto error;
}
done:
Tcl_Release((ClientData) listPtr);
return result;
error:
Tcl_Release((ClientData) listPtr);
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* DestroyListbox --
*
* This procedure is invoked by Tcl_EventuallyFree or Tcl_Release
* to clean up the internal structure of a listbox at a safe time
* (when no-one is using it anymore).
*
* Results:
* None.
*
* Side effects:
* Everything associated with the listbox is freed up.
*
*----------------------------------------------------------------------
*/
static void
DestroyListbox(memPtr)
char *memPtr; /* Info about listbox widget. */
{
register Listbox *listPtr = (Listbox *) memPtr;
register Element *elPtr, *nextPtr;
/*
* Free up all of the list elements.
*/
for (elPtr = listPtr->firstPtr; elPtr != NULL; ) {
nextPtr = elPtr->nextPtr;
ckfree((char *) elPtr);
elPtr = nextPtr;
}
/*
* Free up all the stuff that requires special handling, then
* let Tk_FreeOptions handle all the standard option-related
* stuff.
*/
if (listPtr->textGC != None) {
Tk_FreeGC(listPtr->display, listPtr->textGC);
}
if (listPtr->selTextGC != None) {
Tk_FreeGC(listPtr->display, listPtr->selTextGC);
}
Tk_FreeOptions(configSpecs, (char *) listPtr, listPtr->display, 0);
ckfree((char *) listPtr);
}
/*
*----------------------------------------------------------------------
*
* ConfigureListbox --
*
* This procedure is called to process an argv/argc list, plus
* the Tk option database, in order to configure (or reconfigure)
* a listbox widget.
*
* Results:
* The return value is a standard Tcl result. If TCL_ERROR is
* returned, then interp->result contains an error message.
*
* Side effects:
* Configuration information, such as colors, border width,
* etc. get set for listPtr; old resources get freed,
* if there were any.
*
*----------------------------------------------------------------------
*/
static int
ConfigureListbox(interp, listPtr, argc, argv, flags)
Tcl_Interp *interp; /* Used for error reporting. */
register Listbox *listPtr; /* Information about widget; may or may
* not already have values for some fields. */
int argc; /* Number of valid entries in argv. */
char **argv; /* Arguments. */
int flags; /* Flags to pass to Tk_ConfigureWidget. */
{
int oldExport;
oldExport = listPtr->exportSelection;
if (Tk_ConfigureWidget(interp, listPtr->tkwin, configSpecs,
argc, argv, (char *) listPtr, flags) != TCL_OK) {
return TCL_ERROR;
}
/*
* A few options need special processing, such as setting the
* background from a 3-D border.
*/
Tk_SetBackgroundFromBorder(listPtr->tkwin, listPtr->normalBorder);
if (listPtr->highlightWidth < 0) {
listPtr->highlightWidth = 0;
}
listPtr->inset = listPtr->highlightWidth + listPtr->borderWidth;
/*
* Claim the selection if we've suddenly started exporting it and
* there is a selection to export.
*/
if (listPtr->exportSelection && !oldExport
&& (listPtr->numSelected != 0)) {
Tk_OwnSelection(listPtr->tkwin, XA_PRIMARY, ListboxLostSelection,
(ClientData) listPtr);
}
ListboxWorldChanged((ClientData) listPtr);
return TCL_OK;
}
/*
*---------------------------------------------------------------------------
*
* ListboxWorldChanged --
*
* This procedure is called when the world has changed in some
* way and the widget needs to recompute all its graphics contexts
* and determine its new geometry.
*
* Results:
* None.
*
* Side effects:
* Listbox will be relayed out and redisplayed.
*
*---------------------------------------------------------------------------
*/
static void
ListboxWorldChanged(instanceData)
ClientData instanceData; /* Information about widget. */
{
XGCValues gcValues;
GC gc;
unsigned long mask;
Listbox *listPtr;
listPtr = (Listbox *) instanceData;
gcValues.foreground = listPtr->fgColorPtr->pixel;
gcValues.font = Tk_FontId(listPtr->tkfont);
gcValues.graphics_exposures = False;
mask = GCForeground | GCFont | GCGraphicsExposures;
gc = Tk_GetGC(listPtr->tkwin, mask, &gcValues);
if (listPtr->textGC != None) {
Tk_FreeGC(listPtr->display, listPtr->textGC);
}
listPtr->textGC = gc;
gcValues.foreground = listPtr->selFgColorPtr->pixel;
gcValues.font = Tk_FontId(listPtr->tkfont);
mask = GCForeground | GCFont;
gc = Tk_GetGC(listPtr->tkwin, mask, &gcValues);
if (listPtr->selTextGC != None) {
Tk_FreeGC(listPtr->display, listPtr->selTextGC);
}
listPtr->selTextGC = gc;
/*
* Register the desired geometry for the window and arrange for
* the window to be redisplayed.
*/
ListboxComputeGeometry(listPtr, 1, 1, 1);
listPtr->flags |= UPDATE_V_SCROLLBAR|UPDATE_H_SCROLLBAR;
ListboxRedrawRange(listPtr, 0, listPtr->numElements-1);
}
/*
*--------------------------------------------------------------
*
* DisplayListbox --
*
* This procedure redraws the contents of a listbox window.
*
* Results:
* None.
*
* Side effects:
* Information appears on the screen.
*
*--------------------------------------------------------------
*/
static void
DisplayListbox(clientData)
ClientData clientData; /* Information about window. */
{
register Listbox *listPtr = (Listbox *) clientData;
register Tk_Window tkwin = listPtr->tkwin;
register Element *elPtr;
GC gc;
int i, limit, x, y, width, prevSelected;
Tk_FontMetrics fm;
int left, right; /* Non-zero values here indicate
* that the left or right edge of
* the listbox is off-screen. */
Pixmap pixmap;
listPtr->flags &= ~REDRAW_PENDING;
if (listPtr->flags & UPDATE_V_SCROLLBAR) {
ListboxUpdateVScrollbar(listPtr);
}
if (listPtr->flags & UPDATE_H_SCROLLBAR) {
ListboxUpdateHScrollbar(listPtr);
}
listPtr->flags &= ~(REDRAW_PENDING|UPDATE_V_SCROLLBAR|UPDATE_H_SCROLLBAR);
if ((listPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
return;
}
/*
* Redrawing is done in a temporary pixmap that is allocated
* here and freed at the end of the procedure. All drawing is
* done to the pixmap, and the pixmap is copied to the screen
* at the end of the procedure. This provides the smoothest
* possible visual effects (no flashing on the screen).
*/
pixmap = Tk_GetPixmap(listPtr->display, Tk_WindowId(tkwin),
Tk_Width(tkwin), Tk_Height(tkwin), Tk_Depth(tkwin));
Tk_Fill3DRectangle(tkwin, pixmap, listPtr->normalBorder, 0, 0,
Tk_Width(tkwin), Tk_Height(tkwin), 0, TK_RELIEF_FLAT);
/*
* Iterate through all of the elements of the listbox, displaying each
* in turn. Selected elements use a different GC and have a raised
* background.
*/
limit = listPtr->topIndex + listPtr->fullLines + listPtr->partialLine - 1;
if (limit >= listPtr->numElements) {
limit = listPtr->numElements-1;
}
left = right = 0;
if (listPtr->xOffset > 0) {
left = listPtr->selBorderWidth+1;
}
if ((listPtr->maxWidth - listPtr->xOffset) > (Tk_Width(listPtr->tkwin)
- 2*(listPtr->inset + listPtr->selBorderWidth))) {
right = listPtr->selBorderWidth+1;
}
prevSelected = 0;
for (elPtr = listPtr->firstPtr, i = 0; (elPtr != NULL) && (i <= limit);
prevSelected = elPtr->selected, elPtr = elPtr->nextPtr, i++) {
if (i < listPtr->topIndex) {
continue;
}
x = listPtr->inset;
y = ((i - listPtr->topIndex) * listPtr->lineHeight)
+ listPtr->inset;
gc = listPtr->textGC;
if (elPtr->selected) {
gc = listPtr->selTextGC;
width = Tk_Width(tkwin) - 2*listPtr->inset;
Tk_Fill3DRectangle(tkwin, pixmap, listPtr->selBorder, x, y,
width, listPtr->lineHeight, 0, TK_RELIEF_FLAT);
/*
* Draw beveled edges around the selection, if there are visible
* edges next to this element. Special considerations:
* 1. The left and right bevels may not be visible if horizontal
* scrolling is enabled (the "left" and "right" variables
* are zero to indicate that the corresponding bevel is
* visible).
* 2. Top and bottom bevels are only drawn if this is the
* first or last seleted item.
* 3. If the left or right bevel isn't visible, then the "left"
* and "right" variables, computed above, have non-zero values
* that extend the top and bottom bevels so that the mitered
* corners are off-screen.
*/
if (left == 0) {
Tk_3DVerticalBevel(tkwin, pixmap, listPtr->selBorder,
x, y, listPtr->selBorderWidth, listPtr->lineHeight,
1, TK_RELIEF_RAISED);
}
if (right == 0) {
Tk_3DVerticalBevel(tkwin, pixmap, listPtr->selBorder,
x + width - listPtr->selBorderWidth, y,
listPtr->selBorderWidth, listPtr->lineHeight,
0, TK_RELIEF_RAISED);
}
if (!prevSelected) {
Tk_3DHorizontalBevel(tkwin, pixmap, listPtr->selBorder,
x-left, y, width+left+right, listPtr->selBorderWidth,
1, 1, 1, TK_RELIEF_RAISED);
}
if ((elPtr->nextPtr == NULL) || !elPtr->nextPtr->selected) {
Tk_3DHorizontalBevel(tkwin, pixmap, listPtr->selBorder, x-left,
y + listPtr->lineHeight - listPtr->selBorderWidth,
width+left+right, listPtr->selBorderWidth, 0, 0, 0,
TK_RELIEF_RAISED);
}
}
Tk_GetFontMetrics(listPtr->tkfont, &fm);
y += fm.ascent + listPtr->selBorderWidth;
x = listPtr->inset + listPtr->selBorderWidth - elPtr->lBearing
- listPtr->xOffset;
Tk_DrawChars(listPtr->display, pixmap, gc, listPtr->tkfont,
elPtr->text, elPtr->textLength, x, y);
/*
* If this is the active element, underline it.
*/
if ((i == listPtr->active) && (listPtr->flags & GOT_FOCUS)) {
Tk_UnderlineChars(listPtr->display, pixmap, gc, listPtr->tkfont,
elPtr->text, x, y, 0, elPtr->textLength);
}
}
/*
* Redraw the border for the listbox to make sure that it's on top
* of any of the text of the listbox entries.
*/
Tk_Draw3DRectangle(tkwin, pixmap, listPtr->normalBorder,
listPtr->highlightWidth, listPtr->highlightWidth,
Tk_Width(tkwin) - 2*listPtr->highlightWidth,
Tk_Height(tkwin) - 2*listPtr->highlightWidth,
listPtr->borderWidth, listPtr->relief);
if (listPtr->highlightWidth > 0) {
GC gc;
if (listPtr->flags & GOT_FOCUS) {
gc = Tk_GCForColor(listPtr->highlightColorPtr, pixmap);
} else {
gc = Tk_GCForColor(listPtr->highlightBgColorPtr, pixmap);
}
Tk_DrawFocusHighlight(tkwin, gc, listPtr->highlightWidth, pixmap);
}
XCopyArea(listPtr->display, pixmap, Tk_WindowId(tkwin),
listPtr->textGC, 0, 0, (unsigned) Tk_Width(tkwin),
(unsigned) Tk_Height(tkwin), 0, 0);
Tk_FreePixmap(listPtr->display, pixmap);
}
/*
*----------------------------------------------------------------------
*
* ListboxComputeGeometry --
*
* This procedure is invoked to recompute geometry information
* such as the sizes of the elements and the overall dimensions
* desired for the listbox.
*
* Results:
* None.
*
* Side effects:
* Geometry information is updated and a new requested size is
* registered for the widget. Internal border and gridding
* information is also set.
*
*----------------------------------------------------------------------
*/
static void
ListboxComputeGeometry(listPtr, fontChanged, maxIsStale, updateGrid)
Listbox *listPtr; /* Listbox whose geometry is to be
* recomputed. */
int fontChanged; /* Non-zero means the font may have changed
* so per-element width information also
* has to be computed. */
int maxIsStale; /* Non-zero means the "maxWidth" field may
* no longer be up-to-date and must
* be recomputed. If fontChanged is 1 then
* this must be 1. */
int updateGrid; /* Non-zero means call Tk_SetGrid or
* Tk_UnsetGrid to update gridding for
* the window. */
{
register Element *elPtr;
int width, height, pixelWidth, pixelHeight;
Tk_FontMetrics fm;
if (fontChanged || maxIsStale) {
listPtr->xScrollUnit = Tk_TextWidth(listPtr->tkfont, "0", 1);
if (listPtr->xScrollUnit == 0) {
listPtr->xScrollUnit = 1;
}
listPtr->maxWidth = 0;
for (elPtr = listPtr->firstPtr; elPtr != NULL; elPtr = elPtr->nextPtr) {
if (fontChanged) {
elPtr->pixelWidth = Tk_TextWidth(listPtr->tkfont,
elPtr->text, elPtr->textLength);
elPtr->lBearing = 0;
}
if (elPtr->pixelWidth > listPtr->maxWidth) {
listPtr->maxWidth = elPtr->pixelWidth;
}
}
}
Tk_GetFontMetrics(listPtr->tkfont, &fm);
listPtr->lineHeight = fm.linespace + 1 + 2*listPtr->selBorderWidth;
width = listPtr->width;
if (width <= 0) {
width = (listPtr->maxWidth + listPtr->xScrollUnit - 1)
/listPtr->xScrollUnit;
if (width < 1) {
width = 1;
}
}
pixelWidth = width*listPtr->xScrollUnit + 2*listPtr->inset
+ 2*listPtr->selBorderWidth;
height = listPtr->height;
if (listPtr->height <= 0) {
height = listPtr->numElements;
if (height < 1) {
height = 1;
}
}
pixelHeight = height*listPtr->lineHeight + 2*listPtr->inset;
Tk_GeometryRequest(listPtr->tkwin, pixelWidth, pixelHeight);
Tk_SetInternalBorder(listPtr->tkwin, listPtr->inset);
if (updateGrid) {
if (listPtr->setGrid) {
Tk_SetGrid(listPtr->tkwin, width, height, listPtr->xScrollUnit,
listPtr->lineHeight);
} else {
Tk_UnsetGrid(listPtr->tkwin);
}
}
}
/*
*----------------------------------------------------------------------
*
* InsertEls --
*
* Add new elements to a listbox widget.
*
* Results:
* None.
*
* Side effects:
* New information gets added to listPtr; it will be redisplayed
* soon, but not immediately.
*
*----------------------------------------------------------------------
*/
static void
InsertEls(listPtr, index, argc, argv)
register Listbox *listPtr; /* Listbox that is to get the new
* elements. */
int index; /* Add the new elements before this
* element. */
int argc; /* Number of new elements to add. */
char **argv; /* New elements (one per entry). */
{
register Element *prevPtr, *newPtr;
int length, i, oldMaxWidth;
/*
* Find the element before which the new ones will be inserted.
*/
if (index <= 0) {
index = 0;
}
if (index > listPtr->numElements) {
index = listPtr->numElements;
}
if (index == 0) {
prevPtr = NULL;
} else if (index == listPtr->numElements) {
prevPtr = listPtr->lastPtr;
} else {
for (prevPtr = listPtr->firstPtr, i = index - 1; i > 0; i--) {
prevPtr = prevPtr->nextPtr;
}
}
/*
* For each new element, create a record, initialize it, and link
* it into the list of elements.
*/
oldMaxWidth = listPtr->maxWidth;
for (i = argc ; i > 0; i--, argv++, prevPtr = newPtr) {
length = strlen(*argv);
newPtr = (Element *) ckalloc(ElementSize(length));
newPtr->textLength = length;
strcpy(newPtr->text, *argv);
newPtr->pixelWidth = Tk_TextWidth(listPtr->tkfont, newPtr->text,
newPtr->textLength);
newPtr->lBearing = 0;
if (newPtr->pixelWidth > listPtr->maxWidth) {
listPtr->maxWidth = newPtr->pixelWidth;
}
newPtr->selected = 0;
if (prevPtr == NULL) {
newPtr->nextPtr = listPtr->firstPtr;
listPtr->firstPtr = newPtr;
} else {
newPtr->nextPtr = prevPtr->nextPtr;
prevPtr->nextPtr = newPtr;
}
}
if ((prevPtr != NULL) && (prevPtr->nextPtr == NULL)) {
listPtr->lastPtr = prevPtr;
}
listPtr->numElements += argc;
/*
* Update the selection and other indexes to account for the
* renumbering that has just occurred. Then arrange for the new
* information to be displayed.
*/
if (index <= listPtr->selectAnchor) {
listPtr->selectAnchor += argc;
}
if (index < listPtr->topIndex) {
listPtr->topIndex += argc;
}
if (index <= listPtr->active) {
listPtr->active += argc;
if ((listPtr->active >= listPtr->numElements)
&& (listPtr->numElements > 0)) {
listPtr->active = listPtr->numElements-1;
}
}
listPtr->flags |= UPDATE_V_SCROLLBAR;
if (listPtr->maxWidth != oldMaxWidth) {
listPtr->flags |= UPDATE_H_SCROLLBAR;
}
ListboxComputeGeometry(listPtr, 0, 0, 0);
ListboxRedrawRange(listPtr, index, listPtr->numElements-1);
}
/*
*----------------------------------------------------------------------
*
* DeleteEls --
*
* Remove one or more elements from a listbox widget.
*
* Results:
* None.
*
* Side effects:
* Memory gets freed, the listbox gets modified and (eventually)
* redisplayed.
*
*----------------------------------------------------------------------
*/
static void
DeleteEls(listPtr, first, last)
register Listbox *listPtr; /* Listbox widget to modify. */
int first; /* Index of first element to delete. */
int last; /* Index of last element to delete. */
{
register Element *prevPtr, *elPtr;
int count, i, widthChanged;
/*
* Adjust the range to fit within the existing elements of the
* listbox, and make sure there's something to delete.
*/
if (first < 0) {
first = 0;
}
if (last >= listPtr->numElements) {
last = listPtr->numElements-1;
}
count = last + 1 - first;
if (count <= 0) {
return;
}
/*
* Find the element just before the ones to delete.
*/
if (first == 0) {
prevPtr = NULL;
} else {
for (i = first-1, prevPtr = listPtr->firstPtr; i > 0; i--) {
prevPtr = prevPtr->nextPtr;
}
}
/*
* Delete the requested number of elements.
*/
widthChanged = 0;
for (i = count; i > 0; i--) {
if (prevPtr == NULL) {
elPtr = listPtr->firstPtr;
listPtr->firstPtr = elPtr->nextPtr;
if (listPtr->firstPtr == NULL) {
listPtr->lastPtr = NULL;
}
} else {
elPtr = prevPtr->nextPtr;
prevPtr->nextPtr = elPtr->nextPtr;
if (prevPtr->nextPtr == NULL) {
listPtr->lastPtr = prevPtr;
}
}
if (elPtr->pixelWidth == listPtr->maxWidth) {
widthChanged = 1;
}
if (elPtr->selected) {
listPtr->numSelected -= 1;
}
ckfree((char *) elPtr);
}
listPtr->numElements -= count;
/*
* Update the selection and viewing information to reflect the change
* in the element numbering, and redisplay to slide information up over
* the elements that were deleted.
*/
if (first <= listPtr->selectAnchor) {
listPtr->selectAnchor -= count;
if (listPtr->selectAnchor < first) {
listPtr->selectAnchor = first;
}
}
if (first <= listPtr->topIndex) {
listPtr->topIndex -= count;
if (listPtr->topIndex < first) {
listPtr->topIndex = first;
}
}
if (listPtr->topIndex > (listPtr->numElements - listPtr->fullLines)) {
listPtr->topIndex = listPtr->numElements - listPtr->fullLines;
if (listPtr->topIndex < 0) {
listPtr->topIndex = 0;
}
}
if (listPtr->active > last) {
listPtr->active -= count;
} else if (listPtr->active >= first) {
listPtr->active = first;
if ((listPtr->active >= listPtr->numElements)
&& (listPtr->numElements > 0)) {
listPtr->active = listPtr->numElements-1;
}
}
listPtr->flags |= UPDATE_V_SCROLLBAR;
ListboxComputeGeometry(listPtr, 0, widthChanged, 0);
if (widthChanged) {
listPtr->flags |= UPDATE_H_SCROLLBAR;
}
ListboxRedrawRange(listPtr, first, listPtr->numElements-1);
}
/*
*--------------------------------------------------------------
*
* ListboxEventProc --
*
* This procedure is invoked by the Tk dispatcher for various
* events on listboxes.
*
* Results:
* None.
*
* Side effects:
* When the window gets deleted, internal structures get
* cleaned up. When it gets exposed, it is redisplayed.
*
*--------------------------------------------------------------
*/
static void
ListboxEventProc(clientData, eventPtr)
ClientData clientData; /* Information about window. */
XEvent *eventPtr; /* Information about event. */
{
Listbox *listPtr = (Listbox *) clientData;
if (eventPtr->type == Expose) {
ListboxRedrawRange(listPtr,
NearestListboxElement(listPtr, eventPtr->xexpose.y),
NearestListboxElement(listPtr, eventPtr->xexpose.y
+ eventPtr->xexpose.height));
} else if (eventPtr->type == DestroyNotify) {
if (listPtr->tkwin != NULL) {
if (listPtr->setGrid) {
Tk_UnsetGrid(listPtr->tkwin);
}
listPtr->tkwin = NULL;
Tcl_DeleteCommandFromToken(listPtr->interp, listPtr->widgetCmd);
}
if (listPtr->flags & REDRAW_PENDING) {
Tcl_CancelIdleCall(DisplayListbox, (ClientData) listPtr);
}
Tcl_EventuallyFree((ClientData) listPtr, DestroyListbox);
} else if (eventPtr->type == ConfigureNotify) {
int vertSpace;
vertSpace = Tk_Height(listPtr->tkwin) - 2*listPtr->inset;
listPtr->fullLines = vertSpace / listPtr->lineHeight;
if ((listPtr->fullLines*listPtr->lineHeight) < vertSpace) {
listPtr->partialLine = 1;
} else {
listPtr->partialLine = 0;
}
listPtr->flags |= UPDATE_V_SCROLLBAR|UPDATE_H_SCROLLBAR;
ChangeListboxView(listPtr, listPtr->topIndex);
ChangeListboxOffset(listPtr, listPtr->xOffset);
/*
* Redraw the whole listbox. It's hard to tell what needs
* to be redrawn (e.g. if the listbox has shrunk then we
* may only need to redraw the borders), so just redraw
* everything for safety.
*/
ListboxRedrawRange(listPtr, 0, listPtr->numElements-1);
} else if (eventPtr->type == FocusIn) {
if (eventPtr->xfocus.detail != NotifyInferior) {
listPtr->flags |= GOT_FOCUS;
ListboxRedrawRange(listPtr, 0, listPtr->numElements-1);
}
} else if (eventPtr->type == FocusOut) {
if (eventPtr->xfocus.detail != NotifyInferior) {
listPtr->flags &= ~GOT_FOCUS;
ListboxRedrawRange(listPtr, 0, listPtr->numElements-1);
}
}
}
/*
*----------------------------------------------------------------------
*
* ListboxCmdDeletedProc --
*
* This procedure is invoked when a widget command is deleted. If
* the widget isn't already in the process of being destroyed,
* this command destroys it.
*
* Results:
* None.
*
* Side effects:
* The widget is destroyed.
*
*----------------------------------------------------------------------
*/
static void
ListboxCmdDeletedProc(clientData)
ClientData clientData; /* Pointer to widget record for widget. */
{
Listbox *listPtr = (Listbox *) clientData;
Tk_Window tkwin = listPtr->tkwin;
/*
* This procedure could be invoked either because the window was
* destroyed and the command was then deleted (in which case tkwin
* is NULL) or because the command was deleted, and then this procedure
* destroys the widget.
*/
if (tkwin != NULL) {
if (listPtr->setGrid) {
Tk_UnsetGrid(listPtr->tkwin);
}
listPtr->tkwin = NULL;
Tk_DestroyWindow(tkwin);
}
}
/*
*--------------------------------------------------------------
*
* GetListboxIndex --
*
* Parse an index into a listbox and return either its value
* or an error.
*
* Results:
* A standard Tcl result. If all went well, then *indexPtr is
* filled in with the index (into listPtr) corresponding to
* string. Otherwise an error message is left in interp->result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static int
GetListboxIndex(interp, listPtr, string, endIsSize, indexPtr)
Tcl_Interp *interp; /* For error messages. */
Listbox *listPtr; /* Listbox for which the index is being
* specified. */
char *string; /* Specifies an element in the listbox. */
int endIsSize; /* If 1, "end" refers to the number of
* entries in the listbox. If 0, "end"
* refers to 1 less than the number of
* entries. */
int *indexPtr; /* Where to store converted index. */
{
int c;
size_t length;
length = strlen(string);
c = string[0];
if ((c == 'a') && (strncmp(string, "active", length) == 0)
&& (length >= 2)) {
*indexPtr = listPtr->active;
} else if ((c == 'a') && (strncmp(string, "anchor", length) == 0)
&& (length >= 2)) {
*indexPtr = listPtr->selectAnchor;
} else if ((c == 'e') && (strncmp(string, "end", length) == 0)) {
if (endIsSize) {
*indexPtr = listPtr->numElements;
} else {
*indexPtr = listPtr->numElements - 1;
}
} else if (c == '@') {
int y;
char *p, *end;
p = string+1;
strtol(p, &end, 0);
if ((end == p) || (*end != ',')) {
goto badIndex;
}
p = end+1;
y = strtol(p, &end, 0);
if ((end == p) || (*end != 0)) {
goto badIndex;
}
*indexPtr = NearestListboxElement(listPtr, y);
} else {
if (Tcl_GetInt(interp, string, indexPtr) != TCL_OK) {
Tcl_ResetResult(interp);
goto badIndex;
}
}
return TCL_OK;
badIndex:
Tcl_AppendResult(interp, "bad listbox index \"", string,
"\": must be active, anchor, end, @x,y, or a number",
(char *) NULL);
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* ChangeListboxView --
*
* Change the view on a listbox widget so that a given element
* is displayed at the top.
*
* Results:
* None.
*
* Side effects:
* What's displayed on the screen is changed. If there is a
* scrollbar associated with this widget, then the scrollbar
* is instructed to change its display too.
*
*----------------------------------------------------------------------
*/
static void
ChangeListboxView(listPtr, index)
register Listbox *listPtr; /* Information about widget. */
int index; /* Index of element in listPtr
* that should now appear at the
* top of the listbox. */
{
if (index >= (listPtr->numElements - listPtr->fullLines)) {
index = listPtr->numElements - listPtr->fullLines;
}
if (index < 0) {
index = 0;
}
if (listPtr->topIndex != index) {
listPtr->topIndex = index;
if (!(listPtr->flags & REDRAW_PENDING)) {
Tcl_DoWhenIdle(DisplayListbox, (ClientData) listPtr);
listPtr->flags |= REDRAW_PENDING;
}
listPtr->flags |= UPDATE_V_SCROLLBAR;
}
}
/*
*----------------------------------------------------------------------
*
* ChangListboxOffset --
*
* Change the horizontal offset for a listbox.
*
* Results:
* None.
*
* Side effects:
* The listbox may be redrawn to reflect its new horizontal
* offset.
*
*----------------------------------------------------------------------
*/
static void
ChangeListboxOffset(listPtr, offset)
register Listbox *listPtr; /* Information about widget. */
int offset; /* Desired new "xOffset" for
* listbox. */
{
int maxOffset;
/*
* Make sure that the new offset is within the allowable range, and
* round it off to an even multiple of xScrollUnit.
*/
maxOffset = listPtr->maxWidth - (Tk_Width(listPtr->tkwin) -
2*listPtr->inset - 2*listPtr->selBorderWidth)
+ listPtr->xScrollUnit - 1;
if (offset > maxOffset) {
offset = maxOffset;
}
if (offset < 0) {
offset = 0;
}
offset -= offset % listPtr->xScrollUnit;
if (offset != listPtr->xOffset) {
listPtr->xOffset = offset;
listPtr->flags |= UPDATE_H_SCROLLBAR;
ListboxRedrawRange(listPtr, 0, listPtr->numElements);
}
}
/*
*----------------------------------------------------------------------
*
* ListboxScanTo --
*
* Given a point (presumably of the curent mouse location)
* drag the view in the window to implement the scan operation.
*
* Results:
* None.
*
* Side effects:
* The view in the window may change.
*
*----------------------------------------------------------------------
*/
static void
ListboxScanTo(listPtr, x, y)
register Listbox *listPtr; /* Information about widget. */
int x; /* X-coordinate to use for scan
* operation. */
int y; /* Y-coordinate to use for scan
* operation. */
{
int newTopIndex, newOffset, maxIndex, maxOffset;
maxIndex = listPtr->numElements - listPtr->fullLines;
maxOffset = listPtr->maxWidth + (listPtr->xScrollUnit - 1)
- (Tk_Width(listPtr->tkwin) - 2*listPtr->inset
- 2*listPtr->selBorderWidth - listPtr->xScrollUnit);
/*
* Compute new top line for screen by amplifying the difference
* between the current position and the place where the scan
* started (the "mark" position). If we run off the top or bottom
* of the list, then 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).
*/
newTopIndex = listPtr->scanMarkYIndex
- (10*(y - listPtr->scanMarkY))/listPtr->lineHeight;
if (newTopIndex > maxIndex) {
newTopIndex = listPtr->scanMarkYIndex = maxIndex;
listPtr->scanMarkY = y;
} else if (newTopIndex < 0) {
newTopIndex = listPtr->scanMarkYIndex = 0;
listPtr->scanMarkY = y;
}
ChangeListboxView(listPtr, newTopIndex);
/*
* Compute new left edge for display in a similar fashion by amplifying
* the difference between the current position and the place where the
* scan started.
*/
newOffset = listPtr->scanMarkXOffset - (10*(x - listPtr->scanMarkX));
if (newOffset > maxOffset) {
newOffset = listPtr->scanMarkXOffset = maxOffset;
listPtr->scanMarkX = x;
} else if (newOffset < 0) {
newOffset = listPtr->scanMarkXOffset = 0;
listPtr->scanMarkX = x;
}
ChangeListboxOffset(listPtr, newOffset);
}
/*
*----------------------------------------------------------------------
*
* NearestListboxElement --
*
* Given a y-coordinate inside a listbox, compute the index of
* the element under that y-coordinate (or closest to that
* y-coordinate).
*
* Results:
* The return value is an index of an element of listPtr. If
* listPtr has no elements, then 0 is always returned.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
NearestListboxElement(listPtr, y)
register Listbox *listPtr; /* Information about widget. */
int y; /* Y-coordinate in listPtr's window. */
{
int index;
index = (y - listPtr->inset)/listPtr->lineHeight;
if (index >= (listPtr->fullLines + listPtr->partialLine)) {
index = listPtr->fullLines + listPtr->partialLine - 1;
}
if (index < 0) {
index = 0;
}
index += listPtr->topIndex;
if (index >= listPtr->numElements) {
index = listPtr->numElements-1;
}
return index;
}
/*
*----------------------------------------------------------------------
*
* ListboxSelect --
*
* Select or deselect one or more elements in a listbox..
*
* Results:
* None.
*
* Side effects:
* All of the elements in the range between first and last are
* marked as either selected or deselected, depending on the
* "select" argument. Any items whose state changes are redisplayed.
* The selection is claimed from X when the number of selected
* elements changes from zero to non-zero.
*
*----------------------------------------------------------------------
*/
static void
ListboxSelect(listPtr, first, last, select)
register Listbox *listPtr; /* Information about widget. */
int first; /* Index of first element to
* select or deselect. */
int last; /* Index of last element to
* select or deselect. */
int select; /* 1 means select items, 0 means
* deselect them. */
{
int i, firstRedisplay, increment, oldCount;
Element *elPtr;
if (last < first) {
i = first;
first = last;
last = i;
}
if ((last < 0) || (first >= listPtr->numElements)) {
return;
}
if (first < 0) {
first = 0;
}
if (last >= listPtr->numElements) {
last = listPtr->numElements - 1;
}
oldCount = listPtr->numSelected;
firstRedisplay = -1;
increment = select ? 1 : -1;
for (i = 0, elPtr = listPtr->firstPtr; i < first;
i++, elPtr = elPtr->nextPtr) {
/* Empty loop body. */
}
for ( ; i <= last; i++, elPtr = elPtr->nextPtr) {
if (elPtr->selected == select) {
continue;
}
listPtr->numSelected += increment;
elPtr->selected = select;
if (firstRedisplay < 0) {
firstRedisplay = i;
}
}
if (firstRedisplay >= 0) {
ListboxRedrawRange(listPtr, first, last);
}
if ((oldCount == 0) && (listPtr->numSelected > 0)
&& (listPtr->exportSelection)) {
Tk_OwnSelection(listPtr->tkwin, XA_PRIMARY, ListboxLostSelection,
(ClientData) listPtr);
}
}
/*
*----------------------------------------------------------------------
*
* ListboxFetchSelection --
*
* This procedure is called back by Tk when the selection is
* requested by someone. It returns part or all of the selection
* in a buffer provided by the caller.
*
* Results:
* The return value is the number of non-NULL bytes stored
* at buffer. Buffer is filled (or partially filled) with a
* NULL-terminated string containing part or all of the selection,
* as given by offset and maxBytes. The selection is returned
* as a Tcl list with one list element for each element in the
* listbox.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
ListboxFetchSelection(clientData, offset, buffer, maxBytes)
ClientData clientData; /* Information about listbox widget. */
int offset; /* Offset within selection of first
* byte to be returned. */
char *buffer; /* Location in which to place
* selection. */
int maxBytes; /* Maximum number of bytes to place
* at buffer, not including terminating
* NULL character. */
{
register Listbox *listPtr = (Listbox *) clientData;
register Element *elPtr;
Tcl_DString selection;
int length, count, needNewline;
if (!listPtr->exportSelection) {
return -1;
}
/*
* Use a dynamic string to accumulate the contents of the selection.
*/
needNewline = 0;
Tcl_DStringInit(&selection);
for (elPtr = listPtr->firstPtr; elPtr != NULL; elPtr = elPtr->nextPtr) {
if (elPtr->selected) {
if (needNewline) {
Tcl_DStringAppend(&selection, "\n", 1);
}
Tcl_DStringAppend(&selection, elPtr->text, elPtr->textLength);
needNewline = 1;
}
}
length = Tcl_DStringLength(&selection);
if (length == 0) {
return -1;
}
/*
* Copy the requested portion of the selection to the buffer.
*/
count = length - offset;
if (count <= 0) {
count = 0;
} else {
if (count > maxBytes) {
count = maxBytes;
}
memcpy((VOID *) buffer,
(VOID *) (Tcl_DStringValue(&selection) + offset),
(size_t) count);
}
buffer[count] = '\0';
Tcl_DStringFree(&selection);
return count;
}
/*
*----------------------------------------------------------------------
*
* ListboxLostSelection --
*
* This procedure is called back by Tk when the selection is
* grabbed away from a listbox widget.
*
* Results:
* None.
*
* Side effects:
* The existing selection is unhighlighted, and the window is
* marked as not containing a selection.
*
*----------------------------------------------------------------------
*/
static void
ListboxLostSelection(clientData)
ClientData clientData; /* Information about listbox widget. */
{
register Listbox *listPtr = (Listbox *) clientData;
if ((listPtr->exportSelection) && (listPtr->numElements > 0)) {
ListboxSelect(listPtr, 0, listPtr->numElements-1, 0);
}
}
/*
*----------------------------------------------------------------------
*
* ListboxRedrawRange --
*
* Ensure that a given range of elements is eventually redrawn on
* the display (if those elements in fact appear on the display).
*
* Results:
* None.
*
* Side effects:
* Information gets redisplayed.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
static void
ListboxRedrawRange(listPtr, first, last)
register Listbox *listPtr; /* Information about widget. */
int first; /* Index of first element in list
* that needs to be redrawn. */
int last; /* Index of last element in list
* that needs to be redrawn. May
* be less than first;
* these just bracket a range. */
{
if ((listPtr->tkwin == NULL) || !Tk_IsMapped(listPtr->tkwin)
|| (listPtr->flags & REDRAW_PENDING)) {
return;
}
Tcl_DoWhenIdle(DisplayListbox, (ClientData) listPtr);
listPtr->flags |= REDRAW_PENDING;
}
/*
*----------------------------------------------------------------------
*
* ListboxUpdateVScrollbar --
*
* This procedure is invoked whenever information has changed in
* a listbox in a way that would invalidate a vertical scrollbar
* display. If there is an associated scrollbar, then this command
* updates it by invoking a Tcl command.
*
* Results:
* None.
*
* Side effects:
* A Tcl command is invoked, and an additional command may be
* invoked to process errors in the command.
*
*----------------------------------------------------------------------
*/
static void
ListboxUpdateVScrollbar(listPtr)
register Listbox *listPtr; /* Information about widget. */
{
char string[100];
double first, last;
int result;
Tcl_Interp *interp;
if (listPtr->yScrollCmd == NULL) {
return;
}
if (listPtr->numElements == 0) {
first = 0.0;
last = 1.0;
} else {
first = listPtr->topIndex/((double) listPtr->numElements);
last = (listPtr->topIndex+listPtr->fullLines)
/((double) listPtr->numElements);
if (last > 1.0) {
last = 1.0;
}
}
sprintf(string, " %g %g", first, last);
/*
* We must hold onto the interpreter from the listPtr because the data
* at listPtr might be freed as a result of the Tcl_VarEval.
*/
interp = listPtr->interp;
Tcl_Preserve((ClientData) interp);
result = Tcl_VarEval(interp, listPtr->yScrollCmd, string,
(char *) NULL);
if (result != TCL_OK) {
Tcl_AddErrorInfo(interp,
"\n (vertical scrolling command executed by listbox)");
Tcl_BackgroundError(interp);
}
Tcl_Release((ClientData) interp);
}
/*
*----------------------------------------------------------------------
*
* ListboxUpdateHScrollbar --
*
* This procedure is invoked whenever information has changed in
* a listbox in a way that would invalidate a horizontal scrollbar
* display. If there is an associated horizontal scrollbar, then
* this command updates it by invoking a Tcl command.
*
* Results:
* None.
*
* Side effects:
* A Tcl command is invoked, and an additional command may be
* invoked to process errors in the command.
*
*----------------------------------------------------------------------
*/
static void
ListboxUpdateHScrollbar(listPtr)
register Listbox *listPtr; /* Information about widget. */
{
char string[60];
int result, windowWidth;
double first, last;
Tcl_Interp *interp;
if (listPtr->xScrollCmd == NULL) {
return;
}
windowWidth = Tk_Width(listPtr->tkwin) - 2*(listPtr->inset
+ listPtr->selBorderWidth);
if (listPtr->maxWidth == 0) {
first = 0;
last = 1.0;
} else {
first = listPtr->xOffset/((double) listPtr->maxWidth);
last = (listPtr->xOffset + windowWidth)
/((double) listPtr->maxWidth);
if (last > 1.0) {
last = 1.0;
}
}
sprintf(string, " %g %g", first, last);
/*
* We must hold onto the interpreter because the data referred to at
* listPtr might be freed as a result of the call to Tcl_VarEval.
*/
interp = listPtr->interp;
Tcl_Preserve((ClientData) interp);
result = Tcl_VarEval(interp, listPtr->xScrollCmd, string,
(char *) NULL);
if (result != TCL_OK) {
Tcl_AddErrorInfo(interp,
"\n (horizontal scrolling command executed by listbox)");
Tcl_BackgroundError(interp);
}
Tcl_Release((ClientData) interp);
}
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