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archie/tk3.6/tkButton.c

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Intial commit
2024-05-27 16:13:40 +02:00
/*
* tkButton.c --
*
* This module implements a collection of button-like
* widgets for the Tk toolkit. The widgets implemented
* include labels, buttons, check buttons, and radio
* buttons.
*
* 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/tkButton.c,v 1.78 93/07/15 16:39:15 ouster Exp $ SPRITE (Berkeley)";
#endif
#include "default.h"
#include "tkConfig.h"
#include "tkInt.h"
/*
* A data structure of the following type is kept for each
* widget managed by this file:
*/
typedef struct {
Tk_Window tkwin; /* Window that embodies the button. NULL
* means that the window has been destroyed. */
Display *display; /* Display containing widget. Needed to
* free up resources after tkwin is gone. */
Tcl_Interp *interp; /* Interpreter associated with button. */
int type; /* Type of widget: restricts operations
* that may be performed on widget. See
* below for possible values. */
/*
* Information about what's in the button.
*/
char *text; /* Text to display in button (malloc'ed)
* or NULL. */
int textLength; /* # of characters in text. */
char *textVarName; /* Name of variable (malloc'ed) or NULL.
* If non-NULL, button displays the contents
* of this variable. */
Pixmap bitmap; /* Bitmap to display or None. If not None
* then text and textVar are ignored. */
/*
* Information used when displaying widget:
*/
Tk_Uid state; /* State of button for display purposes:
* normal, active, or disabled. */
Tk_3DBorder normalBorder; /* Structure used to draw 3-D
* border and background when window
* isn't active. NULL means no such
* border exists. */
Tk_3DBorder activeBorder; /* Structure used to draw 3-D
* border and background when window
* is active. NULL means no such
* border exists. */
int borderWidth; /* Width of border. */
int relief; /* 3-d effect: TK_RELIEF_RAISED, etc. */
XFontStruct *fontPtr; /* Information about text font, or NULL. */
XColor *normalFg; /* Foreground color in normal mode. */
XColor *activeFg; /* Foreground color in active mode. NULL
* means use normalFg instead. */
XColor *disabledFg; /* Foreground color when disabled. NULL
* means use normalFg with a 50% stipple
* instead. */
GC normalTextGC; /* GC for drawing text in normal mode. Also
* used to copy from off-screen pixmap onto
* screen. */
GC activeTextGC; /* GC for drawing text in active mode (NULL
* means use normalTextGC). */
Pixmap gray; /* Pixmap for displaying disabled text if
* disabledFg is NULL. */
GC disabledGC; /* Used to produce disabled effect. If
* disabledFg isn't NULL, this GC is used to
* draw button text or icon. Otherwise
* text or icon is drawn with normalGC and
* this GC is used to stipple background
* across it. */
int leftBearing; /* Distance from origin of text to its leftmost
* drawn pixel, in pixels (positive measures
* to the right). */
int rightBearing; /* Amount text sticks right from its origin. */
int width, height; /* If > 0, these specify dimensions to request
* for window, in characters for text and in
* pixels for bitmaps. In this case the actual
* size of the text string or bitmap is
* ignored in computing desired window size. */
int padX, padY; /* Extra space around text or bitmap (pixels
* on each side). */
Tk_Anchor anchor; /* Where text/bitmap should be displayed
* inside button region. */
XColor *selectorFg; /* Color for selector. */
GC selectorGC; /* For drawing highlight when this button
* is in selected state. */
int selectorSpace; /* Horizontal space (in pixels) allocated for
* display of selector. */
int selectorDiameter; /* Diameter of selector, in pixels. */
/*
* For check and radio buttons, the fields below are used
* to manage the variable indicating the button's state.
*/
char *selVarName; /* Name of variable used to control selected
* state of button. Malloc'ed (if
* not NULL). */
char *onValue; /* Value to store in variable when
* this button is selected. Malloc'ed (if
* not NULL). */
char *offValue; /* Value to store in variable when this
* button isn't selected. Malloc'ed
* (if not NULL). Valid only for check
* buttons. */
/*
* Miscellaneous information:
*/
Cursor cursor; /* Current cursor for window, or None. */
char *command; /* Command to execute when button is
* invoked; valid for buttons only.
* If not NULL, it's malloc-ed. */
int flags; /* Various flags; see below for
* definitions. */
} Button;
/*
* Possible "type" values for buttons. These are the kinds of
* widgets supported by this file. The ordering of the type
* numbers is significant: greater means more features and is
* used in the code.
*/
#define TYPE_LABEL 0
#define TYPE_BUTTON 1
#define TYPE_CHECK_BUTTON 2
#define TYPE_RADIO_BUTTON 3
/*
* Class names for buttons, indexed by one of the type values above.
*/
static char *classNames[] = {"Label", "Button", "Checkbutton", "Radiobutton"};
/*
* Flag bits for buttons:
*
* REDRAW_PENDING: Non-zero means a DoWhenIdle handler
* has already been queued to redraw
* this window.
* SELECTED: Non-zero means this button is selected,
* so special highlight should be drawn.
*/
#define REDRAW_PENDING 1
#define SELECTED 2
/*
* Mask values used to selectively enable entries in the
* configuration specs:
*/
#define LABEL_MASK TK_CONFIG_USER_BIT
#define BUTTON_MASK TK_CONFIG_USER_BIT << 1
#define CHECK_BUTTON_MASK TK_CONFIG_USER_BIT << 2
#define RADIO_BUTTON_MASK TK_CONFIG_USER_BIT << 3
#define ALL_MASK (LABEL_MASK | BUTTON_MASK \
| CHECK_BUTTON_MASK | RADIO_BUTTON_MASK)
static int configFlags[] = {LABEL_MASK, BUTTON_MASK,
CHECK_BUTTON_MASK, RADIO_BUTTON_MASK};
/*
* Information used for parsing configuration specs:
*/
static Tk_ConfigSpec configSpecs[] = {
{TK_CONFIG_BORDER, "-activebackground", "activeBackground", "Foreground",
DEF_BUTTON_ACTIVE_BG_COLOR, Tk_Offset(Button, activeBorder),
BUTTON_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK
|TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_BORDER, "-activebackground", "activeBackground", "Foreground",
DEF_BUTTON_ACTIVE_BG_MONO, Tk_Offset(Button, activeBorder),
BUTTON_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK
|TK_CONFIG_MONO_ONLY},
{TK_CONFIG_COLOR, "-activeforeground", "activeForeground", "Background",
DEF_BUTTON_ACTIVE_FG_COLOR, Tk_Offset(Button, activeFg),
BUTTON_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK
|TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_COLOR, "-activeforeground", "activeForeground", "Background",
DEF_BUTTON_ACTIVE_FG_MONO, Tk_Offset(Button, activeFg),
BUTTON_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK
|TK_CONFIG_MONO_ONLY},
{TK_CONFIG_ANCHOR, "-anchor", "anchor", "Anchor",
DEF_BUTTON_ANCHOR, Tk_Offset(Button, anchor), ALL_MASK},
{TK_CONFIG_BORDER, "-background", "background", "Background",
DEF_BUTTON_BG_COLOR, Tk_Offset(Button, normalBorder),
ALL_MASK | TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_BORDER, "-background", "background", "Background",
DEF_BUTTON_BG_MONO, Tk_Offset(Button, normalBorder),
ALL_MASK | TK_CONFIG_MONO_ONLY},
{TK_CONFIG_SYNONYM, "-bd", "borderWidth", (char *) NULL,
(char *) NULL, 0, ALL_MASK},
{TK_CONFIG_SYNONYM, "-bg", "background", (char *) NULL,
(char *) NULL, 0, ALL_MASK},
{TK_CONFIG_BITMAP, "-bitmap", "bitmap", "Bitmap",
DEF_BUTTON_BITMAP, Tk_Offset(Button, bitmap),
ALL_MASK|TK_CONFIG_NULL_OK},
{TK_CONFIG_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
DEF_BUTTON_BORDER_WIDTH, Tk_Offset(Button, borderWidth), ALL_MASK},
{TK_CONFIG_STRING, "-command", "command", "Command",
DEF_BUTTON_COMMAND, Tk_Offset(Button, command),
BUTTON_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK|TK_CONFIG_NULL_OK},
{TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor",
DEF_BUTTON_CURSOR, Tk_Offset(Button, cursor),
ALL_MASK|TK_CONFIG_NULL_OK},
{TK_CONFIG_COLOR, "-disabledforeground", "disabledForeground",
"DisabledForeground", DEF_BUTTON_DISABLED_FG_COLOR,
Tk_Offset(Button, disabledFg), BUTTON_MASK|CHECK_BUTTON_MASK
|RADIO_BUTTON_MASK|TK_CONFIG_COLOR_ONLY|TK_CONFIG_NULL_OK},
{TK_CONFIG_COLOR, "-disabledforeground", "disabledForeground",
"DisabledForeground", DEF_BUTTON_DISABLED_FG_MONO,
Tk_Offset(Button, disabledFg), BUTTON_MASK|CHECK_BUTTON_MASK
|RADIO_BUTTON_MASK|TK_CONFIG_MONO_ONLY|TK_CONFIG_NULL_OK},
{TK_CONFIG_SYNONYM, "-fg", "foreground", (char *) NULL,
(char *) NULL, 0, ALL_MASK},
{TK_CONFIG_FONT, "-font", "font", "Font",
DEF_BUTTON_FONT, Tk_Offset(Button, fontPtr),
ALL_MASK},
{TK_CONFIG_COLOR, "-foreground", "foreground", "Foreground",
DEF_BUTTON_FG, Tk_Offset(Button, normalFg), ALL_MASK},
{TK_CONFIG_INT, "-height", "height", "Height",
DEF_BUTTON_HEIGHT, Tk_Offset(Button, height), ALL_MASK},
{TK_CONFIG_STRING, "-offvalue", "offValue", "Value",
DEF_BUTTON_OFF_VALUE, Tk_Offset(Button, offValue),
CHECK_BUTTON_MASK},
{TK_CONFIG_STRING, "-onvalue", "onValue", "Value",
DEF_BUTTON_ON_VALUE, Tk_Offset(Button, onValue),
CHECK_BUTTON_MASK},
{TK_CONFIG_PIXELS, "-padx", "padX", "Pad",
DEF_BUTTON_PADX, Tk_Offset(Button, padX), ALL_MASK},
{TK_CONFIG_PIXELS, "-pady", "padY", "Pad",
DEF_BUTTON_PADY, Tk_Offset(Button, padY), ALL_MASK},
{TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
DEF_BUTTON_RELIEF, Tk_Offset(Button, relief),
BUTTON_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK},
{TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
DEF_LABEL_RELIEF, Tk_Offset(Button, relief), LABEL_MASK},
{TK_CONFIG_COLOR, "-selector", "selector", "Foreground",
DEF_BUTTON_SELECTOR_COLOR, Tk_Offset(Button, selectorFg),
CHECK_BUTTON_MASK|RADIO_BUTTON_MASK|TK_CONFIG_COLOR_ONLY
|TK_CONFIG_NULL_OK},
{TK_CONFIG_COLOR, "-selector", "selector", "Foreground",
DEF_BUTTON_SELECTOR_MONO, Tk_Offset(Button, selectorFg),
CHECK_BUTTON_MASK|RADIO_BUTTON_MASK|TK_CONFIG_MONO_ONLY
|TK_CONFIG_NULL_OK},
{TK_CONFIG_UID, "-state", "state", "State",
DEF_BUTTON_STATE, Tk_Offset(Button, state),
BUTTON_MASK|CHECK_BUTTON_MASK|RADIO_BUTTON_MASK},
{TK_CONFIG_STRING, "-text", "text", "Text",
DEF_BUTTON_TEXT, Tk_Offset(Button, text), ALL_MASK},
{TK_CONFIG_STRING, "-textvariable", "textVariable", "Variable",
DEF_BUTTON_TEXT_VARIABLE, Tk_Offset(Button, textVarName),
ALL_MASK|TK_CONFIG_NULL_OK},
{TK_CONFIG_STRING, "-value", "value", "Value",
DEF_BUTTON_VALUE, Tk_Offset(Button, onValue),
RADIO_BUTTON_MASK|TK_CONFIG_NULL_OK},
{TK_CONFIG_STRING, "-variable", "variable", "Variable",
DEF_RADIOBUTTON_VARIABLE, Tk_Offset(Button, selVarName),
RADIO_BUTTON_MASK},
{TK_CONFIG_STRING, "-variable", "variable", "Variable",
DEF_CHECKBUTTON_VARIABLE, Tk_Offset(Button, selVarName),
CHECK_BUTTON_MASK|TK_CONFIG_NULL_OK},
{TK_CONFIG_INT, "-width", "width", "Width",
DEF_BUTTON_WIDTH, Tk_Offset(Button, width), ALL_MASK},
{TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
(char *) NULL, 0, 0}
};
/*
* String to print out in error messages, identifying options for
* widget commands for different types of labels or buttons:
*/
static char *optionStrings[] = {
"configure",
"activate, configure, deactivate, flash, or invoke",
"activate, configure, deactivate, deselect, flash, invoke, select, or toggle",
"activate, configure, deactivate, deselect, flash, invoke, or select"
};
/*
* Forward declarations for procedures defined later in this file:
*/
static void ButtonEventProc _ANSI_ARGS_((ClientData clientData,
XEvent *eventPtr));
static char * ButtonTextVarProc _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *interp, char *name1, char *name2,
int flags));
static char * ButtonVarProc _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *interp, char *name1, char *name2,
int flags));
static int ButtonWidgetCmd _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *interp, int argc, char **argv));
static void ComputeButtonGeometry _ANSI_ARGS_((Button *butPtr));
static int ConfigureButton _ANSI_ARGS_((Tcl_Interp *interp,
Button *butPtr, int argc, char **argv,
int flags));
static void DestroyButton _ANSI_ARGS_((ClientData clientData));
static void DisplayButton _ANSI_ARGS_((ClientData clientData));
static int InvokeButton _ANSI_ARGS_((Button *butPtr));
/*
*--------------------------------------------------------------
*
* Tk_ButtonCmd --
*
* This procedure is invoked to process the "button", "label",
* "radiobutton", and "checkbutton" Tcl commands. See the
* user documentation for details on what it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*--------------------------------------------------------------
*/
int
Tk_ButtonCmd(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 Button *butPtr;
int type;
Tk_Window tkwin = (Tk_Window) clientData;
Tk_Window new;
if (argc < 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " pathName ?options?\"", (char *) NULL);
return TCL_ERROR;
}
switch (argv[0][0]) {
case 'l':
type = TYPE_LABEL;
break;
case 'b':
type = TYPE_BUTTON;
break;
case 'c':
type = TYPE_CHECK_BUTTON;
break;
case 'r':
type = TYPE_RADIO_BUTTON;
break;
default:
sprintf(interp->result,
"unknown button-creation command \"%.50s\"", argv[0]);
return TCL_ERROR;
}
/*
* Create the new window.
*/
new = Tk_CreateWindowFromPath(interp, tkwin, argv[1], (char *) NULL);
if (new == NULL) {
return TCL_ERROR;
}
/*
* Initialize the data structure for the button.
*/
butPtr = (Button *) ckalloc(sizeof(Button));
butPtr->tkwin = new;
butPtr->display = Tk_Display(new);
butPtr->interp = interp;
butPtr->type = type;
butPtr->text = NULL;
butPtr->textLength = 0;
butPtr->textVarName = NULL;
butPtr->bitmap = None;
butPtr->state = tkNormalUid;
butPtr->normalBorder = NULL;
butPtr->activeBorder = NULL;
butPtr->borderWidth = 0;
butPtr->relief = TK_RELIEF_FLAT;
butPtr->fontPtr = NULL;
butPtr->normalFg = NULL;
butPtr->activeFg = NULL;
butPtr->disabledFg = NULL;
butPtr->normalTextGC = None;
butPtr->activeTextGC = None;
butPtr->gray = None;
butPtr->disabledGC = None;
butPtr->leftBearing = 0;
butPtr->rightBearing = 0;
butPtr->width = 0;
butPtr->height = 0;
butPtr->padX = 0;
butPtr->padY = 0;
butPtr->anchor = TK_ANCHOR_CENTER;
butPtr->selectorFg = NULL;
butPtr->selectorGC = None;
butPtr->selectorSpace = 0;
butPtr->selectorDiameter = 0;
butPtr->selVarName = NULL;
butPtr->onValue = NULL;
butPtr->offValue = NULL;
butPtr->cursor = None;
butPtr->command = NULL;
butPtr->flags = 0;
Tk_SetClass(new, classNames[type]);
Tk_CreateEventHandler(butPtr->tkwin, ExposureMask|StructureNotifyMask,
ButtonEventProc, (ClientData) butPtr);
Tcl_CreateCommand(interp, Tk_PathName(butPtr->tkwin), ButtonWidgetCmd,
(ClientData) butPtr, (void (*)()) NULL);
if (ConfigureButton(interp, butPtr, argc-2, argv+2,
configFlags[type]) != TCL_OK) {
Tk_DestroyWindow(butPtr->tkwin);
return TCL_ERROR;
}
interp->result = Tk_PathName(butPtr->tkwin);
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* ButtonWidgetCmd --
*
* 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
ButtonWidgetCmd(clientData, interp, argc, argv)
ClientData clientData; /* Information about button widget. */
Tcl_Interp *interp; /* Current interpreter. */
int argc; /* Number of arguments. */
char **argv; /* Argument strings. */
{
register Button *butPtr = (Button *) clientData;
int result = TCL_OK;
int length;
char c;
if (argc < 2) {
sprintf(interp->result,
"wrong # args: should be \"%.50s option [arg arg ...]\"",
argv[0]);
return TCL_ERROR;
}
Tk_Preserve((ClientData) butPtr);
c = argv[1][0];
length = strlen(argv[1]);
if ((c == 'a') && (strncmp(argv[1], "activate", length) == 0)
&& (butPtr->type != TYPE_LABEL)) {
if (argc > 2) {
sprintf(interp->result,
"wrong # args: should be \"%.50s activate\"",
argv[0]);
goto error;
}
if (butPtr->state != tkDisabledUid) {
butPtr->state = tkActiveUid;
Tk_SetBackgroundFromBorder(butPtr->tkwin, butPtr->activeBorder);
goto redisplay;
}
} else if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)) {
if (argc == 2) {
result = Tk_ConfigureInfo(interp, butPtr->tkwin, configSpecs,
(char *) butPtr, (char *) NULL, configFlags[butPtr->type]);
} else if (argc == 3) {
result = Tk_ConfigureInfo(interp, butPtr->tkwin, configSpecs,
(char *) butPtr, argv[2],
configFlags[butPtr->type]);
} else {
result = ConfigureButton(interp, butPtr, argc-2, argv+2,
configFlags[butPtr->type] | TK_CONFIG_ARGV_ONLY);
}
} else if ((c == 'd') && (strncmp(argv[1], "deactivate", length) == 0)
&& (length > 2) && (butPtr->type != TYPE_LABEL)) {
if (argc > 2) {
sprintf(interp->result,
"wrong # args: should be \"%.50s deactivate\"",
argv[0]);
goto error;
}
if (butPtr->state != tkDisabledUid) {
butPtr->state = tkNormalUid;
Tk_SetBackgroundFromBorder(butPtr->tkwin, butPtr->normalBorder);
goto redisplay;
}
} else if ((c == 'd') && (strncmp(argv[1], "deselect", length) == 0)
&& (length > 2) && (butPtr->type >= TYPE_CHECK_BUTTON)) {
if (argc > 2) {
sprintf(interp->result,
"wrong # args: should be \"%.50s deselect\"",
argv[0]);
goto error;
}
if (butPtr->type == TYPE_CHECK_BUTTON) {
Tcl_SetVar(interp, butPtr->selVarName, butPtr->offValue,
TCL_GLOBAL_ONLY);
} else if (butPtr->flags & SELECTED) {
Tcl_SetVar(interp, butPtr->selVarName, "", TCL_GLOBAL_ONLY);
}
} else if ((c == 'f') && (strncmp(argv[1], "flash", length) == 0)
&& (butPtr->type != TYPE_LABEL)) {
int i;
if (argc > 2) {
sprintf(interp->result,
"wrong # args: should be \"%.50s flash\"",
argv[0]);
goto error;
}
if (butPtr->state != tkDisabledUid) {
for (i = 0; i < 4; i++) {
butPtr->state = (butPtr->state == tkNormalUid)
? tkActiveUid : tkNormalUid;
Tk_SetBackgroundFromBorder(butPtr->tkwin,
(butPtr->state == tkActiveUid) ? butPtr->activeBorder
: butPtr->normalBorder);
DisplayButton((ClientData) butPtr);
XFlush(butPtr->display);
Tk_Sleep(50);
}
}
} else if ((c == 'i') && (strncmp(argv[1], "invoke", length) == 0)
&& (butPtr->type > TYPE_LABEL)) {
if (argc > 2) {
sprintf(interp->result,
"wrong # args: should be \"%.50s invoke\"",
argv[0]);
goto error;
}
if (butPtr->state != tkDisabledUid) {
result = InvokeButton(butPtr);
}
} else if ((c == 's') && (strncmp(argv[1], "select", length) == 0)
&& (butPtr->type >= TYPE_CHECK_BUTTON)) {
if (argc > 2) {
sprintf(interp->result,
"wrong # args: should be \"%.50s select\"",
argv[0]);
goto error;
}
Tcl_SetVar(interp, butPtr->selVarName, butPtr->onValue, TCL_GLOBAL_ONLY);
} else if ((c == 't') && (strncmp(argv[1], "toggle", length) == 0)
&& (length >= 2) && (butPtr->type == TYPE_CHECK_BUTTON)) {
if (argc > 2) {
sprintf(interp->result,
"wrong # args: should be \"%.50s select\"",
argv[0]);
goto error;
}
if (butPtr->flags & SELECTED) {
Tcl_SetVar(interp, butPtr->selVarName, butPtr->offValue, TCL_GLOBAL_ONLY);
} else {
Tcl_SetVar(interp, butPtr->selVarName, butPtr->onValue, TCL_GLOBAL_ONLY);
}
} else {
sprintf(interp->result,
"bad option \"%.50s\": must be %s", argv[1],
optionStrings[butPtr->type]);
goto error;
}
Tk_Release((ClientData) butPtr);
return result;
redisplay:
if (Tk_IsMapped(butPtr->tkwin) && !(butPtr->flags & REDRAW_PENDING)) {
Tk_DoWhenIdle(DisplayButton, (ClientData) butPtr);
butPtr->flags |= REDRAW_PENDING;
}
Tk_Release((ClientData) butPtr);
return TCL_OK;
error:
Tk_Release((ClientData) butPtr);
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* DestroyButton --
*
* This procedure is invoked by Tk_EventuallyFree or Tk_Release
* to clean up the internal structure of a button at a safe time
* (when no-one is using it anymore).
*
* Results:
* None.
*
* Side effects:
* Everything associated with the widget is freed up.
*
*----------------------------------------------------------------------
*/
static void
DestroyButton(clientData)
ClientData clientData; /* Info about entry widget. */
{
register Button *butPtr = (Button *) clientData;
/*
* Free up all the stuff that requires special handling, then
* let Tk_FreeOptions handle all the standard option-related
* stuff.
*/
if (butPtr->textVarName != NULL) {
Tcl_UntraceVar(butPtr->interp, butPtr->textVarName,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
ButtonTextVarProc, (ClientData) butPtr);
}
if (butPtr->normalTextGC != None) {
Tk_FreeGC(butPtr->display, butPtr->normalTextGC);
}
if (butPtr->activeTextGC != None) {
Tk_FreeGC(butPtr->display, butPtr->activeTextGC);
}
if (butPtr->gray != None) {
Tk_FreeBitmap(butPtr->display, butPtr->gray);
}
if (butPtr->disabledGC != None) {
Tk_FreeGC(butPtr->display, butPtr->disabledGC);
}
if (butPtr->selectorGC != None) {
Tk_FreeGC(butPtr->display, butPtr->selectorGC);
}
if (butPtr->selVarName != NULL) {
Tcl_UntraceVar(butPtr->interp, butPtr->selVarName,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
ButtonVarProc, (ClientData) butPtr);
}
Tk_FreeOptions(configSpecs, (char *) butPtr, butPtr->display,
configFlags[butPtr->type]);
ckfree((char *) butPtr);
}
/*
*----------------------------------------------------------------------
*
* ConfigureButton --
*
* This procedure is called to process an argv/argc list, plus
* the Tk option database, in order to configure (or
* reconfigure) a button 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 text string, colors, font,
* etc. get set for butPtr; old resources get freed, if there
* were any. The button is redisplayed.
*
*----------------------------------------------------------------------
*/
static int
ConfigureButton(interp, butPtr, argc, argv, flags)
Tcl_Interp *interp; /* Used for error reporting. */
register Button *butPtr; /* 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 newGC;
unsigned long mask;
/*
* Eliminate any existing trace on variables monitored by the button.
*/
if (butPtr->textVarName != NULL) {
Tcl_UntraceVar(interp, butPtr->textVarName,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
ButtonTextVarProc, (ClientData) butPtr);
}
if (butPtr->selVarName != NULL) {
Tcl_UntraceVar(interp, butPtr->selVarName,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
ButtonVarProc, (ClientData) butPtr);
}
if (Tk_ConfigureWidget(interp, butPtr->tkwin, configSpecs,
argc, argv, (char *) butPtr, flags) != TCL_OK) {
return TCL_ERROR;
}
/*
* A few options need special processing, such as setting the
* background from a 3-D border, or filling in complicated
* defaults that couldn't be specified to Tk_ConfigureWidget.
*/
if (butPtr->state == tkActiveUid) {
Tk_SetBackgroundFromBorder(butPtr->tkwin, butPtr->activeBorder);
} else {
Tk_SetBackgroundFromBorder(butPtr->tkwin, butPtr->normalBorder);
if ((butPtr->state != tkNormalUid)
&& (butPtr->state != tkDisabledUid)) {
Tcl_AppendResult(interp, "bad state value \"", butPtr->state,
"\": must be normal, active, or disabled", (char *) NULL);
butPtr->state = tkNormalUid;
return TCL_ERROR;
}
}
gcValues.font = butPtr->fontPtr->fid;
gcValues.foreground = butPtr->normalFg->pixel;
gcValues.background = Tk_3DBorderColor(butPtr->normalBorder)->pixel;
/*
* Note: GraphicsExpose events are disabled in normalTextGC because it's
* used to copy stuff from an off-screen pixmap onto the screen (we know
* that there's no problem with obscured areas).
*/
gcValues.graphics_exposures = False;
newGC = Tk_GetGC(butPtr->tkwin,
GCForeground|GCBackground|GCFont|GCGraphicsExposures, &gcValues);
if (butPtr->normalTextGC != None) {
Tk_FreeGC(butPtr->display, butPtr->normalTextGC);
}
butPtr->normalTextGC = newGC;
if (butPtr->activeFg != NULL) {
gcValues.font = butPtr->fontPtr->fid;
gcValues.foreground = butPtr->activeFg->pixel;
gcValues.background = Tk_3DBorderColor(butPtr->activeBorder)->pixel;
newGC = Tk_GetGC(butPtr->tkwin, GCForeground|GCBackground|GCFont,
&gcValues);
if (butPtr->activeTextGC != None) {
Tk_FreeGC(butPtr->display, butPtr->activeTextGC);
}
butPtr->activeTextGC = newGC;
}
gcValues.font = butPtr->fontPtr->fid;
gcValues.background = Tk_3DBorderColor(butPtr->normalBorder)->pixel;
if (butPtr->disabledFg != NULL) {
gcValues.foreground = butPtr->disabledFg->pixel;
mask = GCForeground|GCBackground|GCFont;
} else {
gcValues.foreground = gcValues.background;
if (butPtr->gray == None) {
butPtr->gray = Tk_GetBitmap(interp, butPtr->tkwin,
Tk_GetUid("gray50"));
if (butPtr->gray == None) {
return TCL_ERROR;
}
}
gcValues.fill_style = FillStippled;
gcValues.stipple = butPtr->gray;
mask = GCForeground|GCFillStyle|GCStipple;
}
newGC = Tk_GetGC(butPtr->tkwin, mask, &gcValues);
if (butPtr->disabledGC != None) {
Tk_FreeGC(butPtr->display, butPtr->disabledGC);
}
butPtr->disabledGC = newGC;
if (butPtr->padX < 0) {
butPtr->padX = 0;
}
if (butPtr->padY < 0) {
butPtr->padY = 0;
}
if (butPtr->type >= TYPE_CHECK_BUTTON) {
char *value;
if (butPtr->selectorFg != NULL) {
gcValues.foreground = butPtr->selectorFg->pixel;
newGC = Tk_GetGC(butPtr->tkwin, GCForeground, &gcValues);
} else {
newGC = None;
}
if (butPtr->selectorGC != None) {
Tk_FreeGC(butPtr->display, butPtr->selectorGC);
}
butPtr->selectorGC = newGC;
if (butPtr->selVarName == NULL) {
butPtr->selVarName = (char *) ckalloc((unsigned)
(strlen(Tk_Name(butPtr->tkwin)) + 1));
strcpy(butPtr->selVarName, Tk_Name(butPtr->tkwin));
}
if (butPtr->onValue == NULL) {
butPtr->onValue = (char *) ckalloc((unsigned)
(strlen(Tk_Name(butPtr->tkwin)) + 1));
strcpy(butPtr->onValue, Tk_Name(butPtr->tkwin));
}
/*
* Select the button if the associated variable has the
* appropriate value, initialize the variable if it doesn't
* exist, then set a trace on the variable to monitor future
* changes to its value.
*/
value = Tcl_GetVar(interp, butPtr->selVarName, TCL_GLOBAL_ONLY);
butPtr->flags &= ~SELECTED;
if (value != NULL) {
if (strcmp(value, butPtr->onValue) == 0) {
butPtr->flags |= SELECTED;
}
} else {
Tcl_SetVar(interp, butPtr->selVarName,
(butPtr->type == TYPE_CHECK_BUTTON) ? butPtr->offValue : "",
TCL_GLOBAL_ONLY);
}
Tcl_TraceVar(interp, butPtr->selVarName,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
ButtonVarProc, (ClientData) butPtr);
}
/*
* If the button is to display the value of a variable, then set up
* a trace on the variable's value, create the variable if it doesn't
* exist, and fetch its current value.
*/
if ((butPtr->bitmap == None) && (butPtr->textVarName != NULL)) {
char *value;
value = Tcl_GetVar(interp, butPtr->textVarName, TCL_GLOBAL_ONLY);
if (value == NULL) {
Tcl_SetVar(interp, butPtr->textVarName, butPtr->text,
TCL_GLOBAL_ONLY);
} else {
if (butPtr->text != NULL) {
ckfree(butPtr->text);
}
butPtr->text = ckalloc((unsigned) (strlen(value) + 1));
strcpy(butPtr->text, value);
}
Tcl_TraceVar(interp, butPtr->textVarName,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
ButtonTextVarProc, (ClientData) butPtr);
}
ComputeButtonGeometry(butPtr);
/*
* Lastly, arrange for the button to be redisplayed.
*/
if (Tk_IsMapped(butPtr->tkwin) && !(butPtr->flags & REDRAW_PENDING)) {
Tk_DoWhenIdle(DisplayButton, (ClientData) butPtr);
butPtr->flags |= REDRAW_PENDING;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* DisplayButton --
*
* This procedure is invoked to display a button widget.
*
* Results:
* None.
*
* Side effects:
* Commands are output to X to display the button in its
* current mode.
*
*----------------------------------------------------------------------
*/
static void
DisplayButton(clientData)
ClientData clientData; /* Information about widget. */
{
register Button *butPtr = (Button *) clientData;
GC gc;
Tk_3DBorder border;
Pixmap pixmap;
int x = 0; /* Initialization only needed to stop
* compiler warning. */
int y;
register Tk_Window tkwin = butPtr->tkwin;
butPtr->flags &= ~REDRAW_PENDING;
if ((butPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
return;
}
if ((butPtr->state == tkDisabledUid) && (butPtr->disabledFg != NULL)) {
gc = butPtr->disabledGC;
border = butPtr->normalBorder;
} else if (butPtr->state == tkActiveUid) {
gc = butPtr->activeTextGC;
border = butPtr->activeBorder;
} else {
gc = butPtr->normalTextGC;
border = butPtr->normalBorder;
}
/*
* In order to avoid screen flashes, this procedure redraws
* the button in a pixmap, then copies the pixmap to the
* screen in a single operation. This means that there's no
* point in time where the on-sreen image has been cleared.
*/
pixmap = XCreatePixmap(butPtr->display, Tk_WindowId(tkwin),
Tk_Width(tkwin), Tk_Height(tkwin), Tk_Depth(tkwin));
Tk_Fill3DRectangle(butPtr->display, pixmap, border,
0, 0, Tk_Width(tkwin), Tk_Height(tkwin), 0, TK_RELIEF_FLAT);
/*
* Display bitmap or text for button.
*/
if (butPtr->bitmap != None) {
unsigned int width, height;
Tk_SizeOfBitmap(butPtr->display, butPtr->bitmap, &width, &height);
switch (butPtr->anchor) {
case TK_ANCHOR_NW: case TK_ANCHOR_W: case TK_ANCHOR_SW:
x = butPtr->borderWidth + butPtr->selectorSpace
+ butPtr->padX + 1;
break;
case TK_ANCHOR_N: case TK_ANCHOR_CENTER: case TK_ANCHOR_S:
x = (Tk_Width(tkwin) + butPtr->selectorSpace - width)/2;
break;
default:
x = Tk_Width(tkwin) - butPtr->borderWidth - butPtr->padX
- width - 1;
break;
}
switch (butPtr->anchor) {
case TK_ANCHOR_NW: case TK_ANCHOR_N: case TK_ANCHOR_NE:
y = butPtr->borderWidth + butPtr->padY + 1;
break;
case TK_ANCHOR_W: case TK_ANCHOR_CENTER: case TK_ANCHOR_E:
y = (Tk_Height(tkwin) - height)/2;
break;
default:
y = Tk_Height(tkwin) - butPtr->borderWidth - butPtr->padY
- height - 1;
break;
}
if (butPtr->relief == TK_RELIEF_RAISED) {
x -= 1;
y -= 1;
} else if (butPtr->relief == TK_RELIEF_SUNKEN) {
x += 1;
y += 1;
}
XCopyPlane(butPtr->display, butPtr->bitmap, pixmap,
gc, 0, 0, width, height, x, y, 1);
y += height/2;
} else {
switch (butPtr->anchor) {
case TK_ANCHOR_NW: case TK_ANCHOR_W: case TK_ANCHOR_SW:
x = butPtr->borderWidth + butPtr->padX + butPtr->selectorSpace
- butPtr->leftBearing + 1;
break;
case TK_ANCHOR_N: case TK_ANCHOR_CENTER: case TK_ANCHOR_S:
x = (Tk_Width(tkwin) + butPtr->selectorSpace
- butPtr->leftBearing - butPtr->rightBearing)/2;
break;
default:
x = Tk_Width(tkwin) - butPtr->borderWidth - butPtr->padX
- butPtr->rightBearing - 1;
break;
}
switch (butPtr->anchor) {
case TK_ANCHOR_NW: case TK_ANCHOR_N: case TK_ANCHOR_NE:
y = butPtr->borderWidth + butPtr->fontPtr->ascent
+ butPtr->padY + 1;
break;
case TK_ANCHOR_W: case TK_ANCHOR_CENTER: case TK_ANCHOR_E:
y = (Tk_Height(tkwin) + butPtr->fontPtr->ascent
- butPtr->fontPtr->descent)/2;
break;
default:
y = Tk_Height(tkwin) - butPtr->borderWidth - butPtr->padY
- butPtr->fontPtr->descent - 1;
break;
}
if (butPtr->relief == TK_RELIEF_RAISED) {
x -= 1;
y -= 1;
} else if (butPtr->relief == TK_RELIEF_SUNKEN) {
x += 1;
y += 1;
}
XDrawString(butPtr->display, pixmap, gc, x, y,
butPtr->text, butPtr->textLength);
y -= (butPtr->fontPtr->ascent - butPtr->fontPtr->descent)/2;
x += butPtr->leftBearing;
}
/*
* Draw the selector for check buttons and radio buttons. At this
* point x and y refer to the top-left corner of the text or bitmap.
*/
if ((butPtr->type == TYPE_CHECK_BUTTON) && (butPtr->selectorGC != None)) {
int dim;
dim = butPtr->selectorDiameter;
x -= butPtr->selectorSpace;
y -= dim/2;
Tk_Draw3DRectangle(butPtr->display, pixmap, border, x, y,
dim, dim, butPtr->borderWidth, TK_RELIEF_SUNKEN);
x += butPtr->borderWidth;
y += butPtr->borderWidth;
dim -= 2*butPtr->borderWidth;
if (dim > 0) {
if (butPtr->flags & SELECTED) {
XFillRectangle(butPtr->display, pixmap, butPtr->selectorGC,
x, y, (unsigned int) dim, (unsigned int) dim);
} else {
Tk_Fill3DRectangle(butPtr->display, pixmap,
butPtr->normalBorder, x, y, dim, dim,
butPtr->borderWidth, TK_RELIEF_FLAT);
}
}
} else if ((butPtr->type == TYPE_RADIO_BUTTON)
&& (butPtr->selectorGC != None)) {
XPoint points[4];
int radius;
radius = butPtr->selectorDiameter/2;
points[0].x = x - butPtr->selectorSpace;
points[0].y = y;
points[1].x = points[0].x + radius;
points[1].y = points[0].y + radius;
points[2].x = points[1].x + radius;
points[2].y = points[0].y;
points[3].x = points[1].x;
points[3].y = points[0].y - radius;
if (butPtr->flags & SELECTED) {
XFillPolygon(butPtr->display, pixmap, butPtr->selectorGC,
points, 4, Convex, CoordModeOrigin);
} else {
Tk_Fill3DPolygon(butPtr->display, pixmap, butPtr->normalBorder,
points, 4, butPtr->borderWidth, TK_RELIEF_FLAT);
}
Tk_Draw3DPolygon(butPtr->display, pixmap, border,
points, 4, butPtr->borderWidth, TK_RELIEF_RAISED);
}
/*
* If the button is disabled with a stipple rather than a special
* foreground color, generate the stippled effect.
*/
if ((butPtr->state == tkDisabledUid) && (butPtr->disabledFg == NULL)) {
XFillRectangle(butPtr->display, pixmap, butPtr->disabledGC,
butPtr->borderWidth, butPtr->borderWidth,
(unsigned) (Tk_Width(tkwin) - 2*butPtr->borderWidth),
(unsigned) (Tk_Height(tkwin) - 2*butPtr->borderWidth));
}
/*
* Draw the border last. This way, if the button's contents
* overflow onto the border they'll be covered up by the border.
*/
if (butPtr->relief != TK_RELIEF_FLAT) {
Tk_Draw3DRectangle(butPtr->display, pixmap, border,0, 0,
Tk_Width(tkwin), Tk_Height(tkwin), butPtr->borderWidth,
butPtr->relief);
}
/*
* Copy the information from the off-screen pixmap onto the screen,
* then delete the pixmap.
*/
XCopyArea(butPtr->display, pixmap, Tk_WindowId(tkwin),
butPtr->normalTextGC, 0, 0, Tk_Width(tkwin), Tk_Height(tkwin), 0, 0);
XFreePixmap(butPtr->display, pixmap);
}
/*
*--------------------------------------------------------------
*
* ButtonEventProc --
*
* This procedure is invoked by the Tk dispatcher for various
* events on buttons.
*
* Results:
* None.
*
* Side effects:
* When the window gets deleted, internal structures get
* cleaned up. When it gets exposed, it is redisplayed.
*
*--------------------------------------------------------------
*/
static void
ButtonEventProc(clientData, eventPtr)
ClientData clientData; /* Information about window. */
XEvent *eventPtr; /* Information about event. */
{
Button *butPtr = (Button *) clientData;
if ((eventPtr->type == Expose) && (eventPtr->xexpose.count == 0)) {
if ((butPtr->tkwin != NULL) && !(butPtr->flags & REDRAW_PENDING)) {
Tk_DoWhenIdle(DisplayButton, (ClientData) butPtr);
butPtr->flags |= REDRAW_PENDING;
}
} else if (eventPtr->type == DestroyNotify) {
Tcl_DeleteCommand(butPtr->interp, Tk_PathName(butPtr->tkwin));
butPtr->tkwin = NULL;
if (butPtr->flags & REDRAW_PENDING) {
Tk_CancelIdleCall(DisplayButton, (ClientData) butPtr);
}
Tk_EventuallyFree((ClientData) butPtr, DestroyButton);
}
}
/*
*----------------------------------------------------------------------
*
* ComputeButtonGeometry --
*
* After changes in a button's text or bitmap, this procedure
* recomputes the button's geometry and passes this information
* along to the geometry manager for the window.
*
* Results:
* None.
*
* Side effects:
* The button's window may change size.
*
*----------------------------------------------------------------------
*/
static void
ComputeButtonGeometry(butPtr)
register Button *butPtr; /* Button whose geometry may have changed. */
{
XCharStruct bbox;
int dummy;
unsigned int width, height;
butPtr->selectorSpace = 0;
if (butPtr->bitmap != None) {
Tk_SizeOfBitmap(butPtr->display, butPtr->bitmap, &width, &height);
if (butPtr->width > 0) {
width = butPtr->width;
}
if (butPtr->height > 0) {
height = butPtr->height;
}
if ((butPtr->type >= TYPE_CHECK_BUTTON)
&& (butPtr->selectorGC != None)) {
butPtr->selectorSpace = height;
if (butPtr->type == TYPE_CHECK_BUTTON) {
butPtr->selectorDiameter = (65*height)/100;
} else {
butPtr->selectorDiameter = (75*height)/100;
}
}
} else {
butPtr->textLength = strlen(butPtr->text);
XTextExtents(butPtr->fontPtr, butPtr->text, butPtr->textLength,
&dummy, &dummy, &dummy, &bbox);
butPtr->leftBearing = bbox.lbearing;
butPtr->rightBearing = bbox.rbearing;
width = bbox.rbearing - bbox.lbearing;
height = butPtr->fontPtr->ascent + butPtr->fontPtr->descent;
if (butPtr->width > 0) {
width = butPtr->width * XTextWidth(butPtr->fontPtr, "0", 1);
}
if (butPtr->height > 0) {
height *= butPtr->height;
}
if ((butPtr->type >= TYPE_CHECK_BUTTON)
&& (butPtr->selectorGC != None)) {
butPtr->selectorDiameter = butPtr->fontPtr->ascent
+ butPtr->fontPtr->descent;
if (butPtr->type == TYPE_CHECK_BUTTON) {
butPtr->selectorDiameter = (80*butPtr->selectorDiameter)/100;
}
butPtr->selectorSpace = butPtr->selectorDiameter
+ XTextWidth(butPtr->fontPtr, "0", 1);
}
}
/*
* When issuing the geometry request, add extra space for the selector,
* if any, and for the border and padding, plus two extra pixels so the
* display can be offset by 1 pixel in either direction for the raised
* or lowered effect.
*/
width += 2*butPtr->padX;
height += 2*butPtr->padY;
Tk_GeometryRequest(butPtr->tkwin, (int) (width + butPtr->selectorSpace
+ 2*butPtr->borderWidth + 2),
(int) (height + 2*butPtr->borderWidth + 2));
Tk_SetInternalBorder(butPtr->tkwin, butPtr->borderWidth);
}
/*
*----------------------------------------------------------------------
*
* InvokeButton --
*
* This procedure is called to carry out the actions associated
* with a button, such as invoking a Tcl command or setting a
* variable. This procedure is invoked, for example, when the
* button is invoked via the mouse.
*
* Results:
* A standard Tcl return value. Information is also left in
* interp->result.
*
* Side effects:
* Depends on the button and its associated command.
*
*----------------------------------------------------------------------
*/
static int
InvokeButton(butPtr)
register Button *butPtr; /* Information about button. */
{
if (butPtr->type == TYPE_CHECK_BUTTON) {
if (butPtr->flags & SELECTED) {
Tcl_SetVar(butPtr->interp, butPtr->selVarName, butPtr->offValue,
TCL_GLOBAL_ONLY);
} else {
Tcl_SetVar(butPtr->interp, butPtr->selVarName, butPtr->onValue,
TCL_GLOBAL_ONLY);
}
} else if (butPtr->type == TYPE_RADIO_BUTTON) {
Tcl_SetVar(butPtr->interp, butPtr->selVarName, butPtr->onValue,
TCL_GLOBAL_ONLY);
}
if ((butPtr->type != TYPE_LABEL) && (butPtr->command != NULL)) {
return TkCopyAndGlobalEval(butPtr->interp, butPtr->command);
}
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* ButtonVarProc --
*
* This procedure is invoked when someone changes the
* state variable associated with a radio button. Depending
* on the new value of the button's variable, the button
* may be selected or deselected.
*
* Results:
* NULL is always returned.
*
* Side effects:
* The button may become selected or deselected.
*
*--------------------------------------------------------------
*/
/* ARGSUSED */
static char *
ButtonVarProc(clientData, interp, name1, name2, flags)
ClientData clientData; /* Information about button. */
Tcl_Interp *interp; /* Interpreter containing variable. */
char *name1; /* Name of variable. */
char *name2; /* Second part of variable name. */
int flags; /* Information about what happened. */
{
register Button *butPtr = (Button *) clientData;
char *value;
/*
* If the variable is being unset, then just re-establish the
* trace unless the whole interpreter is going away.
*/
if (flags & TCL_TRACE_UNSETS) {
butPtr->flags &= ~SELECTED;
if ((flags & TCL_TRACE_DESTROYED) && !(flags & TCL_INTERP_DESTROYED)) {
Tcl_TraceVar2(interp, name1, name2,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
ButtonVarProc, clientData);
}
goto redisplay;
}
/*
* Use the value of the variable to update the selected status of
* the button.
*/
value = Tcl_GetVar2(interp, name1, name2, flags & TCL_GLOBAL_ONLY);
if (strcmp(value, butPtr->onValue) == 0) {
if (butPtr->flags & SELECTED) {
return (char *) NULL;
}
butPtr->flags |= SELECTED;
} else if (butPtr->flags & SELECTED) {
butPtr->flags &= ~SELECTED;
} else {
return (char *) NULL;
}
redisplay:
if ((butPtr->tkwin != NULL) && Tk_IsMapped(butPtr->tkwin)
&& !(butPtr->flags & REDRAW_PENDING)) {
Tk_DoWhenIdle(DisplayButton, (ClientData) butPtr);
butPtr->flags |= REDRAW_PENDING;
}
return (char *) NULL;
}
/*
*--------------------------------------------------------------
*
* ButtonTextVarProc --
*
* This procedure is invoked when someone changes the variable
* whose contents are to be displayed in a button.
*
* Results:
* NULL is always returned.
*
* Side effects:
* The text displayed in the button will change to match the
* variable.
*
*--------------------------------------------------------------
*/
/* ARGSUSED */
static char *
ButtonTextVarProc(clientData, interp, name1, name2, flags)
ClientData clientData; /* Information about button. */
Tcl_Interp *interp; /* Interpreter containing variable. */
char *name1; /* Name of variable. */
char *name2; /* Second part of variable name. */
int flags; /* Information about what happened. */
{
register Button *butPtr = (Button *) clientData;
char *value;
/*
* If the variable is unset, then immediately recreate it unless
* the whole interpreter is going away.
*/
if (flags & TCL_TRACE_UNSETS) {
if ((flags & TCL_TRACE_DESTROYED) && !(flags & TCL_INTERP_DESTROYED)) {
Tcl_SetVar2(interp, name1, name2, butPtr->text,
flags & TCL_GLOBAL_ONLY);
Tcl_TraceVar2(interp, name1, name2,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
ButtonTextVarProc, clientData);
}
return (char *) NULL;
}
value = Tcl_GetVar2(interp, name1, name2, flags & TCL_GLOBAL_ONLY);
if (value == NULL) {
value = "";
}
if (butPtr->text != NULL) {
ckfree(butPtr->text);
}
butPtr->text = ckalloc((unsigned) (strlen(value) + 1));
strcpy(butPtr->text, value);
ComputeButtonGeometry(butPtr);
if ((butPtr->tkwin != NULL) && Tk_IsMapped(butPtr->tkwin)
&& !(butPtr->flags & REDRAW_PENDING)) {
Tk_DoWhenIdle(DisplayButton, (ClientData) butPtr);
butPtr->flags |= REDRAW_PENDING;
}
return (char *) NULL;
}
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