archie/tk3.6/tkListbox.c

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2024-05-27 16:13:40 +02:00
/*
* 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) 1990-1993 The Regents of the University of California.
* All rights reserved.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#ifndef lint
static char rcsid[] = "$Header: /user6/ouster/wish/RCS/tkListbox.c,v 1.69 93/07/15 16:39:21 ouster Exp $ SPRITE (Berkeley)";
#endif
#include "tkConfig.h"
#include "default.h"
#include "tkInt.h"
/*
* 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). */
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. */
int numElements; /* Total number of elements in this listbox. */
Element *elementPtr; /* First 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. */
XFontStruct *fontPtr; /* 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. */
char *geometry; /* Desired geometry for window. Malloc'ed. */
int lineHeight; /* Number of pixels allocated for each line
* in display. */
int topIndex; /* Index of top-most element visible in
* window. */
int numLines; /* Number of lines (elements) that fit
* in window at one time. */
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, if any.
*/
int selectFirst; /* Index of first selected element (-1 means
* nothing selected. */
int selectLast; /* Index of last selected element. */
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. */
/*
* 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:
*/
Cursor cursor; /* Current cursor for window, or None. */
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 buttons:
*
* 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.
*/
#define REDRAW_PENDING 1
#define UPDATE_V_SCROLLBAR 2
#define UPDATE_H_SCROLLBAR 4
/*
* 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, fontPtr), 0},
{TK_CONFIG_COLOR, "-foreground", "foreground", "Foreground",
DEF_LISTBOX_FG, Tk_Offset(Listbox, fgColorPtr), 0},
{TK_CONFIG_STRING, "-geometry", "geometry", "Geometry",
DEF_LISTBOX_GEOMETRY, Tk_Offset(Listbox, geometry), 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_BOOLEAN, "-setgrid", "setGrid", "SetGrid",
DEF_LISTBOX_SET_GRID, Tk_Offset(Listbox, setGrid), 0},
{TK_CONFIG_STRING, "-xscrollcommand", "xScrollCommand", "ScrollCommand",
DEF_LISTBOX_SCROLL_COMMAND, Tk_Offset(Listbox, xScrollCmd),
TK_CONFIG_NULL_OK},
{TK_CONFIG_STRING, "-yscrollcommand", "yScrollCommand", "ScrollCommand",
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_((ClientData clientData));
static void DisplayListbox _ANSI_ARGS_((ClientData clientData));
static int GetListboxIndex _ANSI_ARGS_((Tcl_Interp *interp,
Listbox *listPtr, char *string, int endAfter,
int *indexPtr));
static void InsertEls _ANSI_ARGS_((Listbox *listPtr, int index,
int argc, char **argv));
static void ListboxComputeWidths _ANSI_ARGS_((Listbox *listPtr,
int fontChanged));
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 ListboxSelectFrom _ANSI_ARGS_((Listbox *listPtr,
int index));
static void ListboxSelectTo _ANSI_ARGS_((Listbox *listPtr,
int index));
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 int NearestListboxElement _ANSI_ARGS_((Listbox *listPtr,
int y));
/*
*--------------------------------------------------------------
*
* 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->numElements = 0;
listPtr->elementPtr = NULL;
listPtr->normalBorder = NULL;
listPtr->borderWidth = 0;
listPtr->relief = TK_RELIEF_RAISED;
listPtr->fontPtr = NULL;
listPtr->fgColorPtr = NULL;
listPtr->textGC = None;
listPtr->selBorder = NULL;
listPtr->selBorderWidth = 0;
listPtr->selFgColorPtr = None;
listPtr->selTextGC = None;
listPtr->geometry = NULL;
listPtr->lineHeight = 0;
listPtr->topIndex = 0;
listPtr->numLines = 0;
listPtr->setGrid = 0;
listPtr->maxWidth = 0;
listPtr->xScrollUnit = 0;
listPtr->xOffset = 0;
listPtr->selectFirst = -1;
listPtr->selectLast = -1;
listPtr->selectAnchor = 0;
listPtr->exportSelection = 1;
listPtr->scanMarkX = 0;
listPtr->scanMarkY = 0;
listPtr->scanMarkXOffset = 0;
listPtr->scanMarkYIndex = 0;
listPtr->cursor = None;
listPtr->xScrollCmd = NULL;
listPtr->yScrollCmd = NULL;
listPtr->flags = 0;
Tk_SetClass(listPtr->tkwin, "Listbox");
Tk_CreateEventHandler(listPtr->tkwin, ExposureMask|StructureNotifyMask,
ListboxEventProc, (ClientData) listPtr);
Tk_CreateSelHandler(listPtr->tkwin, XA_STRING, ListboxFetchSelection,
(ClientData) listPtr, XA_STRING);
Tcl_CreateCommand(interp, Tk_PathName(listPtr->tkwin), ListboxWidgetCmd,
(ClientData) listPtr, (void (*)()) NULL);
if (ConfigureListbox(interp, listPtr, argc-2, argv+2, 0) != TCL_OK) {
goto error;
}
interp->result = Tk_PathName(listPtr->tkwin);
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;
int length;
char c;
if (argc < 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " option ?arg arg ...?\"", (char *) NULL);
return TCL_ERROR;
}
Tk_Preserve((ClientData) listPtr);
c = argv[1][0];
length = strlen(argv[1]);
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;
char index[20];
if (argc != 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " curselection\"",
(char *) NULL);
goto error;
}
if (listPtr->selectFirst != -1) {
for (i = listPtr->selectFirst; i <= listPtr->selectLast; i++) {
sprintf(index, "%d", i);
Tcl_AppendElement(interp, index);
}
}
} 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 (argc == 3) {
last = first;
} else {
if (GetListboxIndex(interp, listPtr, argv[3], 0, &last) != TCL_OK) {
goto error;
}
}
DeleteEls(listPtr, first, last);
} else if ((c == 'g') && (strncmp(argv[1], "get", length) == 0)) {
int index;
register Element *elPtr;
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " get index\"", (char *) NULL);
goto error;
}
if (GetListboxIndex(interp, listPtr, argv[2], 0, &index) != TCL_OK) {
goto error;
}
if (index < 0) {
index = 0;
}
if (index >= listPtr->numElements) {
index = listPtr->numElements-1;
}
for (elPtr = listPtr->elementPtr; index > 0;
index--, elPtr = elPtr->nextPtr) {
/* Empty loop body. */
}
if (elPtr != NULL) {
interp->result = elPtr->text;
}
} else if ((c == 'i') && (strncmp(argv[1], "insert", length) == 0)) {
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') && (length >= 2)
&& (strncmp(argv[1], "select", length) == 0)) {
int index;
if (argc < 3) {
Tcl_AppendResult(interp, "too few args: should be \"",
argv[0], " select option ?index?\"", (char *) NULL);
goto error;
}
length = strlen(argv[2]);
c = argv[2][0];
if ((c == 'c') && (argv[2] != NULL)
&& (strncmp(argv[2], "clear", length) == 0)) {
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " select clear\"", (char *) NULL);
goto error;
}
if (listPtr->selectFirst != -1) {
ListboxRedrawRange(listPtr, listPtr->selectFirst,
listPtr->selectLast);
listPtr->selectFirst = -1;
}
goto done;
}
if (argc != 4) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " select option index\"", (char *) NULL);
goto error;
}
if ((c == 'a') && (strncmp(argv[2], "adjust", length) == 0)) {
if (GetListboxIndex(interp, listPtr, argv[3], 1, &index)
!= TCL_OK) {
goto error;
}
if (index < (listPtr->selectFirst + listPtr->selectLast)/2) {
listPtr->selectAnchor = listPtr->selectLast;
} else {
listPtr->selectAnchor = listPtr->selectFirst;
}
ListboxSelectTo(listPtr, index);
} else if ((c == 'f') && (strncmp(argv[2], "from", length) == 0)) {
if (GetListboxIndex(interp, listPtr, argv[3], 0, &index)
!= TCL_OK) {
goto error;
}
ListboxSelectFrom(listPtr, index);
} else if ((c == 't') && (strncmp(argv[2], "to", length) == 0)) {
if (GetListboxIndex(interp, listPtr, argv[3], 1, &index)
!= TCL_OK) {
goto error;
}
ListboxSelectTo(listPtr, index);
} else {
Tcl_AppendResult(interp, "bad select option \"", argv[2],
"\": must be adjust, clear, from, or to", (char *) NULL);
goto error;
}
} else if ((c == 's') && (length >= 2)
&& (strncmp(argv[1], "size", length) == 0)) {
sprintf(interp->result, "%d", listPtr->numElements);
} else if ((c == 'x') && (strncmp(argv[1], "xview", length) == 0)) {
int index;
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " xview index\"", (char *) NULL);
goto error;
}
if (Tcl_GetInt(interp, argv[2], &index) != TCL_OK) {
goto error;
}
ChangeListboxOffset(listPtr, index*listPtr->xScrollUnit);
} else if ((c == 'y') && (strncmp(argv[1], "yview", length) == 0)) {
int index;
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " yview index\"", (char *) NULL);
goto error;
}
if (GetListboxIndex(interp, listPtr, argv[2], 0, &index) != TCL_OK) {
goto error;
}
ChangeListboxView(listPtr, index);
} else {
Tcl_AppendResult(interp, "bad option \"", argv[1],
"\": must be configure, curselection, delete, get, ",
"insert, nearest, scan, select, size, ",
"xview, or yview", (char *) NULL);
goto error;
}
done:
Tk_Release((ClientData) listPtr);
return result;
error:
Tk_Release((ClientData) listPtr);
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* DestroyListbox --
*
* This procedure is invoked by Tk_EventuallyFree or Tk_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(clientData)
ClientData clientData; /* Info about listbox widget. */
{
register Listbox *listPtr = (Listbox *) clientData;
register Element *elPtr, *nextPtr;
/*
* Free up all of the list elements.
*/
for (elPtr = listPtr->elementPtr; 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. */
{
XGCValues gcValues;
GC new;
int width, height, fontHeight, oldExport;
int pixelWidth, pixelHeight;
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 parsing the
* geometry and setting the background from a 3-D border.
*/
Tk_SetBackgroundFromBorder(listPtr->tkwin, listPtr->normalBorder);
gcValues.foreground = listPtr->fgColorPtr->pixel;
gcValues.font = listPtr->fontPtr->fid;
gcValues.graphics_exposures = False;
new = Tk_GetGC(listPtr->tkwin, GCForeground|GCFont|GCGraphicsExposures,
&gcValues);
if (listPtr->textGC != None) {
Tk_FreeGC(listPtr->display, listPtr->textGC);
}
listPtr->textGC = new;
gcValues.foreground = listPtr->selFgColorPtr->pixel;
gcValues.font = listPtr->fontPtr->fid;
new = Tk_GetGC(listPtr->tkwin, GCForeground|GCFont, &gcValues);
if (listPtr->selTextGC != None) {
Tk_FreeGC(listPtr->display, listPtr->selTextGC);
}
listPtr->selTextGC = new;
/*
* Claim the selection if we've suddenly started exporting it.
*/
if (listPtr->exportSelection && (!oldExport)
&& (listPtr->selectFirst !=-1)) {
Tk_OwnSelection(listPtr->tkwin, ListboxLostSelection,
(ClientData) listPtr);
}
/*
* Register the desired geometry for the window, and arrange for
* the window to be redisplayed.
*/
if ((sscanf(listPtr->geometry, "%dx%d", &width, &height) != 2)
|| (width <= 0) || (height <= 0)) {
Tcl_AppendResult(interp, "bad geometry \"",
listPtr->geometry, "\"", (char *) NULL);
return TCL_ERROR;
}
fontHeight = listPtr->fontPtr->ascent + listPtr->fontPtr->descent;
listPtr->lineHeight = fontHeight + 1 + 2*listPtr->selBorderWidth;
listPtr->numLines = (Tk_Height(listPtr->tkwin) - 2*listPtr->borderWidth)
/ listPtr->lineHeight;
if (listPtr->numLines < 0) {
listPtr->numLines = 0;
}
ListboxComputeWidths(listPtr, 1);
pixelWidth = width*listPtr->xScrollUnit + 2*listPtr->borderWidth
+ 2*listPtr->selBorderWidth;
pixelHeight = height*listPtr->lineHeight + 2*listPtr->borderWidth;
Tk_GeometryRequest(listPtr->tkwin, pixelWidth, pixelHeight);
Tk_SetInternalBorder(listPtr->tkwin, listPtr->borderWidth);
if (listPtr->setGrid) {
Tk_SetGrid(listPtr->tkwin, width, height, listPtr->xScrollUnit,
listPtr->lineHeight);
}
listPtr->flags |= UPDATE_V_SCROLLBAR|UPDATE_H_SCROLLBAR;
ListboxRedrawRange(listPtr, 0, listPtr->numElements-1);
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* 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, margin;
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 = XCreatePixmap(listPtr->display, Tk_WindowId(tkwin),
Tk_Width(tkwin), Tk_Height(tkwin), Tk_Depth(tkwin));
Tk_Fill3DRectangle(listPtr->display, pixmap, listPtr->normalBorder,
0, 0, Tk_Width(tkwin), Tk_Height(tkwin), listPtr->borderWidth,
listPtr->relief);
/*
* 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->numLines - 1;
if (limit >= listPtr->numElements) {
limit = listPtr->numElements-1;
}
margin = listPtr->selBorderWidth + listPtr->xScrollUnit/2;
for (elPtr = listPtr->elementPtr, i = 0; (elPtr != NULL) && (i <= limit);
elPtr = elPtr->nextPtr, i++) {
if (i < listPtr->topIndex) {
continue;
}
x = listPtr->borderWidth;
y = ((i - listPtr->topIndex) * listPtr->lineHeight)
+ listPtr->borderWidth;
gc = listPtr->textGC;
if ((listPtr->selectFirst >= 0) && (i >= listPtr->selectFirst)
&& (i <= listPtr->selectLast)) {
gc = listPtr->selTextGC;
Tk_Fill3DRectangle(listPtr->display, pixmap,
listPtr->selBorder, x, y,
Tk_Width(tkwin) - 2*listPtr->borderWidth,
listPtr->lineHeight, listPtr->selBorderWidth,
TK_RELIEF_RAISED);
}
y += listPtr->fontPtr->ascent + listPtr->selBorderWidth;
x += margin - elPtr->lBearing - listPtr->xOffset;
XDrawString(listPtr->display, pixmap, gc, x, y,
elPtr->text, 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(listPtr->display, pixmap,
listPtr->normalBorder, 0, 0, Tk_Width(tkwin),
Tk_Height(tkwin), listPtr->borderWidth,
listPtr->relief);
XCopyArea(listPtr->display, pixmap, Tk_WindowId(tkwin),
listPtr->textGC, 0, 0, Tk_Width(tkwin), Tk_Height(tkwin),
0, 0);
XFreePixmap(listPtr->display, pixmap);
}
/*
*----------------------------------------------------------------------
*
* 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, dummy, i, oldMaxWidth;
XCharStruct bbox;
/*
* 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 {
for (prevPtr = listPtr->elementPtr, 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);
XTextExtents(listPtr->fontPtr, newPtr->text, newPtr->textLength,
&dummy, &dummy, &dummy, &bbox);
newPtr->lBearing = bbox.lbearing;
newPtr->pixelWidth = bbox.rbearing - bbox.lbearing;
if (newPtr->pixelWidth > listPtr->maxWidth) {
listPtr->maxWidth = newPtr->pixelWidth;
}
if (prevPtr == NULL) {
newPtr->nextPtr = listPtr->elementPtr;
listPtr->elementPtr = newPtr;
} else {
newPtr->nextPtr = prevPtr->nextPtr;
prevPtr->nextPtr = newPtr;
}
}
listPtr->numElements += argc;
/*
* Update the selection to account for the renumbering that has just
* occurred. Then arrange for the new information to be displayed.
*/
if (index <= listPtr->selectFirst) {
listPtr->selectFirst += argc;
}
if (index <= listPtr->selectLast) {
listPtr->selectLast += argc;
}
listPtr->flags |= UPDATE_V_SCROLLBAR;
if (listPtr->maxWidth != oldMaxWidth) {
listPtr->flags |= UPDATE_H_SCROLLBAR;
}
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->elementPtr; 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->elementPtr;
listPtr->elementPtr = elPtr->nextPtr;
} else {
elPtr = prevPtr->nextPtr;
prevPtr->nextPtr = elPtr->nextPtr;
}
if (elPtr->pixelWidth == listPtr->maxWidth) {
widthChanged = 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->selectFirst) {
listPtr->selectFirst -= count;
if (listPtr->selectFirst < first) {
listPtr->selectFirst = first;
}
}
if (first <= listPtr->selectLast) {
listPtr->selectLast -= count;
if (listPtr->selectLast < first) {
listPtr->selectLast = first-1;
}
}
if (listPtr->selectLast < listPtr->selectFirst) {
listPtr->selectFirst = -1;
}
if (first <= listPtr->topIndex) {
listPtr->topIndex -= count;
if (listPtr->topIndex < first) {
listPtr->topIndex = first;
}
}
listPtr->flags |= UPDATE_V_SCROLLBAR;
if (widthChanged) {
ListboxComputeWidths(listPtr, 0);
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) {
Tcl_DeleteCommand(listPtr->interp, Tk_PathName(listPtr->tkwin));
listPtr->tkwin = NULL;
if (listPtr->flags & REDRAW_PENDING) {
Tk_CancelIdleCall(DisplayListbox, (ClientData) listPtr);
}
Tk_EventuallyFree((ClientData) listPtr, DestroyListbox);
} else if (eventPtr->type == ConfigureNotify) {
Tk_Preserve((ClientData) listPtr);
listPtr->numLines = (Tk_Height(listPtr->tkwin)
- 2*listPtr->borderWidth) / listPtr->lineHeight;
listPtr->flags |= UPDATE_V_SCROLLBAR|UPDATE_H_SCROLLBAR;
ListboxRedrawRange(listPtr, 0, listPtr->numElements-1);
Tk_Release((ClientData) listPtr);
}
}
/*
*--------------------------------------------------------------
*
* 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, endAfter, indexPtr)
Tcl_Interp *interp; /* For error messages. */
Listbox *listPtr; /* Listbox for which the index is being
* specified. */
char *string; /* Numerical index into listPtr's element
* list, or "end" to refer to last element. */
int endAfter; /* 0 means "end" refers to the index of the
* last element, 1 means it refers to the
* element after the last one. */
int *indexPtr; /* Where to store converted index. */
{
if (string[0] == 'e') {
if (strncmp(string, "end", strlen(string)) != 0) {
badIndex:
Tcl_AppendResult(interp, "bad listbox index \"", string,
"\"", (char *) NULL);
return TCL_ERROR;
}
*indexPtr = listPtr->numElements;
if (!endAfter) {
*indexPtr -= 1;
}
if (listPtr->numElements <= 0) {
*indexPtr = 0;
}
} else {
if (Tcl_GetInt(interp, string, indexPtr) != TCL_OK) {
Tcl_ResetResult(interp);
goto badIndex;
}
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* ChangeListboxView --
*
* Change the view on a listbox widget.
*
* 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. */
{
if (index >= listPtr->numElements) {
index = listPtr->numElements-1;
}
if (index < 0) {
index = 0;
}
if (listPtr->topIndex != index) {
listPtr->topIndex = index;
if (!(listPtr->flags & REDRAW_PENDING)) {
Tk_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 + (listPtr->xScrollUnit-1)
- (Tk_Width(listPtr->tkwin) - 2*listPtr->borderWidth
- 2*listPtr->selBorderWidth - listPtr->xScrollUnit);
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;
/*
* 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 >= listPtr->numElements) {
newTopIndex = listPtr->scanMarkYIndex = listPtr->numElements-1;
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 >= listPtr->maxWidth) {
newOffset = listPtr->scanMarkXOffset = listPtr->maxWidth;
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->borderWidth)/listPtr->lineHeight;
if (index >= listPtr->numLines) {
index = listPtr->numLines-1;
}
if (index < 0) {
index = 0;
}
index += listPtr->topIndex;
if (index >= listPtr->numElements) {
index = listPtr->numElements-1;
}
return index;
}
/*
*----------------------------------------------------------------------
*
* ListboxSelectFrom --
*
* Start a new selection in a listbox.
*
* Results:
* None.
*
* Side effects:
* ListPtr claims the selection, and the selection becomes the
* single element given by index.
*
*----------------------------------------------------------------------
*/
static void
ListboxSelectFrom(listPtr, index)
register Listbox *listPtr; /* Information about widget. */
int index; /* Index of element that is to
* become the new selection. */
{
/*
* Make sure the index is within the proper range for the listbox.
*/
if (index <= 0) {
index = 0;
}
if (index >= listPtr->numElements) {
index = listPtr->numElements-1;
}
if (listPtr->selectFirst != -1) {
ListboxRedrawRange(listPtr, listPtr->selectFirst, listPtr->selectLast);
} else if (listPtr->exportSelection) {
Tk_OwnSelection(listPtr->tkwin, ListboxLostSelection,
(ClientData) listPtr);
}
listPtr->selectFirst = listPtr->selectLast = index;
listPtr->selectAnchor = index;
ListboxRedrawRange(listPtr, index, index);
}
/*
*----------------------------------------------------------------------
*
* ListboxSelectTo --
*
* Modify the selection by moving its un-anchored end. This could
* make the selection either larger or smaller.
*
* Results:
* None.
*
* Side effects:
* The selection changes.
*
*----------------------------------------------------------------------
*/
static void
ListboxSelectTo(listPtr, index)
register Listbox *listPtr; /* Information about widget. */
int index; /* Index of element that is to
* become the "other" end of the
* selection. */
{
int newFirst, newLast;
/*
* Make sure the index is within the proper range for the listbox.
*/
if (index <= 0) {
index = 0;
}
if (index >= listPtr->numElements) {
index = listPtr->numElements-1;
}
/*
* We should already own the selection, but grab it if we don't.
*/
if (listPtr->selectFirst == -1) {
ListboxSelectFrom(listPtr, index);
}
if (listPtr->selectAnchor < index) {
newFirst = listPtr->selectAnchor;
newLast = index;
} else {
newFirst = index;
newLast = listPtr->selectAnchor;
}
if ((listPtr->selectFirst == newFirst)
&& (listPtr->selectLast == newLast)) {
return;
}
if (listPtr->selectFirst != newFirst) {
if (listPtr->selectFirst < newFirst) {
ListboxRedrawRange(listPtr, listPtr->selectFirst, newFirst-1);
} else {
ListboxRedrawRange(listPtr, newFirst, listPtr->selectFirst-1);
}
listPtr->selectFirst = newFirst;
}
if (listPtr->selectLast != newLast) {
if (listPtr->selectLast < newLast) {
ListboxRedrawRange(listPtr, listPtr->selectLast+1, newLast);
} else {
ListboxRedrawRange(listPtr, newLast+1, listPtr->selectLast);
}
listPtr->selectLast = newLast;
}
}
/*
*----------------------------------------------------------------------
*
* 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;
char **argv, *selection;
int src, dst, length, count, argc;
if ((listPtr->selectFirst == -1) || !listPtr->exportSelection) {
return -1;
}
/*
* Use Tcl_Merge to format the listbox elements into a suitable
* Tcl list.
*/
argc = listPtr->selectLast - listPtr->selectFirst + 1;
argv = (char **) ckalloc((unsigned) (argc*sizeof(char *)));
for (src = 0, dst = 0, elPtr = listPtr->elementPtr; ;
src++, elPtr = elPtr->nextPtr) {
if (src < listPtr->selectFirst) {
continue;
}
if (src > listPtr->selectLast) {
break;
}
argv[dst] = elPtr->text;
dst++;
}
selection = Tcl_Merge(argc, argv);
/*
* Copy the requested portion of the selection to the buffer.
*/
length = strlen(selection);
count = length - offset;
if (count <= 0) {
count = 0;
goto done;
}
if (count > maxBytes) {
count = maxBytes;
}
memcpy((VOID *) buffer, (VOID *) (selection + offset), count);
done:
buffer[count] = '\0';
ckfree(selection);
ckfree((char *) argv);
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->selectFirst >= 0) && listPtr->exportSelection) {
ListboxRedrawRange(listPtr, listPtr->selectFirst, listPtr->selectLast);
listPtr->selectFirst = -1;
}
}
/*
*----------------------------------------------------------------------
*
* 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;
}
Tk_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[60];
int result, last;
if (listPtr->yScrollCmd == NULL) {
return;
}
last = listPtr->topIndex + listPtr->numLines - 1;
if (last >= listPtr->numElements) {
last = listPtr->numElements-1;
}
if (last < listPtr->topIndex) {
last = listPtr->topIndex;
}
sprintf(string, " %d %d %d %d", listPtr->numElements, listPtr->numLines,
listPtr->topIndex, last);
result = Tcl_VarEval(listPtr->interp, listPtr->yScrollCmd, string,
(char *) NULL);
if (result != TCL_OK) {
Tcl_AddErrorInfo(listPtr->interp,
"\n (vertical scrolling command executed by listbox)");
Tk_BackgroundError(listPtr->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, totalUnits, windowUnits, first, last;
if (listPtr->xScrollCmd == NULL) {
return;
}
totalUnits = 1 + (listPtr->maxWidth-1)/listPtr->xScrollUnit;
windowUnits = 1 + (Tk_Width(listPtr->tkwin)
- 2*(listPtr->borderWidth + listPtr->selBorderWidth)-1)
/listPtr->xScrollUnit;
first = listPtr->xOffset/listPtr->xScrollUnit;
last = first + windowUnits - 1;
if (last < first) {
last = first;
}
sprintf(string, " %d %d %d %d", totalUnits, windowUnits, first, last);
result = Tcl_VarEval(listPtr->interp, listPtr->xScrollCmd, string,
(char *) NULL);
if (result != TCL_OK) {
Tcl_AddErrorInfo(listPtr->interp,
"\n (horizontal scrolling command executed by listbox)");
Tk_BackgroundError(listPtr->interp);
}
}
/*
*----------------------------------------------------------------------
*
* ListboxComputeWidths --
*
* This procedure is invoked to completely recompute width
* information used for displaying listboxes and for horizontal
* scrolling.
*
* Results:
* None.
*
* Side effects:
* If "fontChanged" is non-zero then the widths of the individual
* elements are all recomputed. In addition, listPtr->maxWidth is
* recomputed.
*
*----------------------------------------------------------------------
*/
static void
ListboxComputeWidths(listPtr, fontChanged)
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. */
{
register Element *elPtr;
int dummy;
XCharStruct bbox;
listPtr->xScrollUnit = XTextWidth(listPtr->fontPtr, "0", 1);
listPtr->maxWidth = 0;
for (elPtr = listPtr->elementPtr; elPtr != NULL; elPtr = elPtr->nextPtr) {
if (fontChanged) {
XTextExtents(listPtr->fontPtr, elPtr->text, elPtr->textLength,
&dummy, &dummy, &dummy, &bbox);
elPtr->lBearing = bbox.lbearing;
elPtr->pixelWidth = bbox.rbearing - bbox.lbearing;
}
if (elPtr->pixelWidth > listPtr->maxWidth) {
listPtr->maxWidth = elPtr->pixelWidth;
}
}
}