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1/*
2 * tkScale.c --
3 *
4 * This module implements a scale widgets for the Tk toolkit.
5 * A scale displays a slider that can be adjusted to change a
6 * value; it also displays numeric labels and a textual label,
7 * if desired.
8 *
9 * Copyright 1990 Regents of the University of California.
10 * Permission to use, copy, modify, and distribute this
11 * software and its documentation for any purpose and without
12 * fee is hereby granted, provided that the above copyright
13 * notice appear in all copies. The University of California
14 * makes no representations about the suitability of this
15 * software for any purpose. It is provided "as is" without
16 * express or implied warranty.
17 */
18
19#ifndef lint
20static char rcsid[] = "$Header: /user6/ouster/wish/RCS/tkScale.c,v 1.28 92/08/21 11:45:25 ouster Exp $ SPRITE (Berkeley)";
21#endif
22
23#include "tkconfig.h"
24#include "default.h"
25#include "tkint.h"
26
27/*
28 * A data structure of the following type is kept for each scale
29 * widget managed by this file:
30 */
31
32typedef struct {
33 Tk_Window tkwin; /* Window that embodies the scale. NULL
34 * means that the window has been destroyed
35 * but the data structures haven't yet been
36 * cleaned up.*/
37 Tcl_Interp *interp; /* Interpreter associated with scale. */
38 Tk_Uid orientUid; /* Orientation for window ("vertical" or
39 * "horizontal"). */
40 int vertical; /* Non-zero means vertical orientation,
41 * zero means horizontal. */
42 int value; /* Current value of scale. */
43 int fromValue; /* Value corresponding to left or top of
44 * scale. */
45 int toValue; /* Value corresponding to right or bottom
46 * of scale. */
47 int tickInterval; /* Distance between tick marks; 0 means
48 * don't display any tick marks. */
49 char *command; /* Command prefix to use when invoking Tcl
50 * commands because the scale value changed.
51 * NULL means don't invoke commands.
52 * Malloc'ed. */
53 int commandLength; /* Number of non-NULL bytes in command. */
54 char *label; /* Label to display above or to right of
55 * scale; NULL means don't display a
56 * label. Malloc'ed. */
57 int labelLength; /* Number of non-NULL chars. in label. */
58 Tk_Uid state; /* Normal or disabled. Value cannot be
59 * changed when scale is disabled. */
60
61 /*
62 * Information used when displaying widget:
63 */
64
65 int borderWidth; /* Width of 3-D border around window. */
66 Tk_3DBorder bgBorder; /* Used for drawing background. */
67 Tk_3DBorder sliderBorder; /* Used for drawing slider in normal mode. */
68 Tk_3DBorder activeBorder; /* Used for drawing slider when active (i.e.
69 * when mouse is in window). */
70 XFontStruct *fontPtr; /* Information about text font, or NULL. */
71 XColor *textColorPtr; /* Color for drawing text. */
72 GC textGC; /* GC for drawing text in normal mode. */
73 int width; /* Desired narrow dimension of scale,
74 * in pixels. */
75 int length; /* Desired long dimension of scale,
76 * in pixels. */
77 int relief; /* Indicates whether window as a whole is
78 * raised, sunken, or flat. */
79 int offset; /* Zero if relief is TK_RELIEF_FLAT,
80 * borderWidth otherwise. Indicates how
81 * much interior stuff must be offset from
82 * outside edges to leave room for border. */
83 int sliderLength; /* Length of slider, measured in pixels along
84 * long dimension of scale. */
85 int showValue; /* Non-zero means to display the scale value
86 * below or to the left of the slider; zero
87 * means don't display the value. */
88 int tickPixels; /* Number of pixels required for widest tick
89 * mark. 0 means don't display ticks.*/
90 int valuePixels; /* Number of pixels required for value text. */
91 int labelPixels; /* Number of pixels required for label. 0
92 * means don't display label. */
93
94 /*
95 * Miscellaneous information:
96 */
97
98 Cursor cursor; /* Current cursor for window, or None. */
99 int flags; /* Various flags; see below for
100 * definitions. */
101} Scale;
102
103/*
104 * Flag bits for scales:
105 *
106 * REDRAW_SLIDER - 1 means slider (and numerical readout) need
107 * to be redrawn.
108 * REDRAW_OTHER - 1 means other stuff besides slider and value
109 * need to be redrawn.
110 * REDRAW_ALL - 1 means the entire widget needs to be redrawn.
111 * ACTIVE - 1 means the widget is active (the mouse is
112 * in its window).
113 * BUTTON_PRESSED - 1 means a button press is in progress, so
114 * slider should appear depressed and should be
115 * draggable.
116 */
117
118#define REDRAW_SLIDER 1
119#define REDRAW_OTHER 2
120#define REDRAW_ALL 3
121#define ACTIVE 4
122#define BUTTON_PRESSED 8
123
124/*
125 * Space to leave between scale area and text.
126 */
127
128#define SPACING 2
129
130/*
131 * Information used for argv parsing.
132 */
133
134
135static Tk_ConfigSpec configSpecs[] = {
136 {TK_CONFIG_BORDER, "-activeforeground", "activeForeground", "Background",
137 DEF_SCALE_ACTIVE_FG_COLOR, Tk_Offset(Scale, activeBorder),
138 TK_CONFIG_COLOR_ONLY},
139 {TK_CONFIG_BORDER, "-activeforeground", "activeForeground", "Background",
140 DEF_SCALE_ACTIVE_FG_MONO, Tk_Offset(Scale, activeBorder),
141 TK_CONFIG_MONO_ONLY},
142 {TK_CONFIG_BORDER, "-background", "background", "Background",
143 DEF_SCALE_BG_COLOR, Tk_Offset(Scale, bgBorder),
144 TK_CONFIG_COLOR_ONLY},
145 {TK_CONFIG_BORDER, "-background", "background", "Background",
146 DEF_SCALE_BG_MONO, Tk_Offset(Scale, bgBorder),
147 TK_CONFIG_MONO_ONLY},
148 {TK_CONFIG_SYNONYM, "-bd", "borderWidth", (char *) NULL,
149 (char *) NULL, 0, 0},
150 {TK_CONFIG_SYNONYM, "-bg", "background", (char *) NULL,
151 (char *) NULL, 0, 0},
152 {TK_CONFIG_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
153 DEF_SCALE_BORDER_WIDTH, Tk_Offset(Scale, borderWidth), 0},
154 {TK_CONFIG_STRING, "-command", "command", "Command",
155 (char *) NULL, Tk_Offset(Scale, command), 0},
156 {TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor",
157 DEF_SCALE_CURSOR, Tk_Offset(Scale, cursor), TK_CONFIG_NULL_OK},
158 {TK_CONFIG_SYNONYM, "-fg", "foreground", (char *) NULL,
159 (char *) NULL, 0, 0},
160 {TK_CONFIG_FONT, "-font", "font", "Font",
161 DEF_SCALE_FONT, Tk_Offset(Scale, fontPtr),
162 0},
163 {TK_CONFIG_COLOR, "-foreground", "foreground", "Foreground",
164 DEF_SCALE_FG_COLOR, Tk_Offset(Scale, textColorPtr),
165 TK_CONFIG_COLOR_ONLY},
166 {TK_CONFIG_COLOR, "-foreground", "foreground", "Foreground",
167 DEF_SCALE_FG_MONO, Tk_Offset(Scale, textColorPtr),
168 TK_CONFIG_MONO_ONLY},
169 {TK_CONFIG_INT, "-from", "from", "From",
170 DEF_SCALE_FROM, Tk_Offset(Scale, fromValue), 0},
171 {TK_CONFIG_STRING, "-label", "label", "Label",
172 DEF_SCALE_LABEL, Tk_Offset(Scale, label), 0},
173 {TK_CONFIG_PIXELS, "-length", "length", "Length",
174 DEF_SCALE_LENGTH, Tk_Offset(Scale, length), 0},
175 {TK_CONFIG_UID, "-orient", "orient", "Orient",
176 DEF_SCALE_ORIENT, Tk_Offset(Scale, orientUid), 0},
177 {TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
178 DEF_SCALE_RELIEF, Tk_Offset(Scale, relief), 0},
179 {TK_CONFIG_BOOLEAN, "-showvalue", "showValue", "ShowValue",
180 DEF_SCALE_SHOW_VALUE, Tk_Offset(Scale, showValue), 0},
181 {TK_CONFIG_BORDER, "-sliderforeground", "sliderForeground", "Background",
182 DEF_SCALE_SLIDER_FG_COLOR, Tk_Offset(Scale, sliderBorder),
183 TK_CONFIG_COLOR_ONLY},
184 {TK_CONFIG_BORDER, "-sliderforeground", "sliderForeground", "Background",
185 DEF_SCALE_SLIDER_FG_MONO, Tk_Offset(Scale, sliderBorder),
186 TK_CONFIG_MONO_ONLY},
187 {TK_CONFIG_PIXELS, "-sliderlength", "sliderLength", "SliderLength",
188 DEF_SCALE_SLIDER_LENGTH, Tk_Offset(Scale, sliderLength), 0},
189 {TK_CONFIG_UID, "-state", "state", "State",
190 DEF_SCALE_STATE, Tk_Offset(Scale, state), 0},
191 {TK_CONFIG_INT, "-tickinterval", "tickInterval", "TickInterval",
192 DEF_SCALE_TICK_INTERVAL, Tk_Offset(Scale, tickInterval), 0},
193 {TK_CONFIG_INT, "-to", "to", "To",
194 DEF_SCALE_TO, Tk_Offset(Scale, toValue), 0},
195 {TK_CONFIG_PIXELS, "-width", "width", "Width",
196 DEF_SCALE_WIDTH, Tk_Offset(Scale, width), 0},
197 {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
198 (char *) NULL, 0, 0}
199};
200
201/*
202 * Forward declarations for procedures defined later in this file:
203 */
204
205static void ComputeScaleGeometry _ANSI_ARGS_((Scale *scalePtr));
206static int ConfigureScale _ANSI_ARGS_((Tcl_Interp *interp,
207 Scale *scalePtr, int argc, char **argv,
208 int flags));
209static void DestroyScale _ANSI_ARGS_((ClientData clientData));
210static void DisplayHorizontalScale _ANSI_ARGS_((
211 ClientData clientData));
212static void DisplayHorizontalValue _ANSI_ARGS_((Scale *scalePtr,
213 int value, int bottom));
214static void DisplayVerticalScale _ANSI_ARGS_((
215 ClientData clientData));
216static void DisplayVerticalValue _ANSI_ARGS_((Scale *scalePtr,
217 int value, int rightEdge));
218static void EventuallyRedrawScale _ANSI_ARGS_((Scale *scalePtr,
219 int what));
220static int PixelToValue _ANSI_ARGS_((Scale *scalePtr, int x,
221 int y));
222static void ScaleEventProc _ANSI_ARGS_((ClientData clientData,
223 XEvent *eventPtr));
224static void ScaleMouseProc _ANSI_ARGS_((ClientData clientData,
225 XEvent *eventPtr));
226static int ScaleWidgetCmd _ANSI_ARGS_((ClientData clientData,
227 Tcl_Interp *interp, int argc, char **argv));
228static void SetScaleValue _ANSI_ARGS_((Scale *scalePtr,
229 int value));
230static int ValueToPixel _ANSI_ARGS_((Scale *scalePtr, int value));
231\f
232/*
233 *--------------------------------------------------------------
234 *
235 * Tk_ScaleCmd --
236 *
237 * This procedure is invoked to process the "scale" Tcl
238 * command. See the user documentation for details on what
239 * it does.
240 *
241 * Results:
242 * A standard Tcl result.
243 *
244 * Side effects:
245 * See the user documentation.
246 *
247 *--------------------------------------------------------------
248 */
249
250int
251Tk_ScaleCmd(clientData, interp, argc, argv)
252 ClientData clientData; /* Main window associated with
253 * interpreter. */
254 Tcl_Interp *interp; /* Current interpreter. */
255 int argc; /* Number of arguments. */
256 char **argv; /* Argument strings. */
257{
258 Tk_Window tkwin = (Tk_Window) clientData;
259 register Scale *scalePtr;
260 Tk_Window new;
261
262 if (argc < 2) {
263 Tcl_AppendResult(interp, "wrong # args: should be \"",
264 argv[0], " pathName ?options?\"", (char *) NULL);
265 return TCL_ERROR;
266 }
267
268 new = Tk_CreateWindowFromPath(interp, tkwin, argv[1], (char *) NULL);
269 if (new == NULL) {
270 return TCL_ERROR;
271 }
272
273 /*
274 * Initialize fields that won't be initialized by ConfigureScale,
275 * or which ConfigureScale expects to have reasonable values
276 * (e.g. resource pointers).
277 */
278
279 scalePtr = (Scale *) ckalloc(sizeof(Scale));
280 scalePtr->tkwin = new;
281 scalePtr->interp = interp;
282 scalePtr->value = 0;
283 scalePtr->command = NULL;
284 scalePtr->label = NULL;
285 scalePtr->state = tkNormalUid;
286 scalePtr->bgBorder = NULL;
287 scalePtr->sliderBorder = NULL;
288 scalePtr->activeBorder = NULL;
289 scalePtr->fontPtr = NULL;
290 scalePtr->textColorPtr = NULL;
291 scalePtr->textGC = None;
292 scalePtr->cursor = None;
293 scalePtr->flags = 0;
294
295 Tk_SetClass(scalePtr->tkwin, "Scale");
296 Tk_CreateEventHandler(scalePtr->tkwin, ExposureMask|StructureNotifyMask,
297 ScaleEventProc, (ClientData) scalePtr);
298 Tk_CreateEventHandler(scalePtr->tkwin, EnterWindowMask|LeaveWindowMask
299 |PointerMotionMask|ButtonPressMask|ButtonReleaseMask,
300 ScaleMouseProc, (ClientData) scalePtr);
301 Tcl_CreateCommand(interp, Tk_PathName(scalePtr->tkwin), ScaleWidgetCmd,
302 (ClientData) scalePtr, (void (*)()) NULL);
303 if (ConfigureScale(interp, scalePtr, argc-2, argv+2, 0) != TCL_OK) {
304 goto error;
305 }
306
307 interp->result = Tk_PathName(scalePtr->tkwin);
308 return TCL_OK;
309
310 error:
311 Tk_DestroyWindow(scalePtr->tkwin);
312 return TCL_ERROR;
313}
314\f
315/*
316 *--------------------------------------------------------------
317 *
318 * ScaleWidgetCmd --
319 *
320 * This procedure is invoked to process the Tcl command
321 * that corresponds to a widget managed by this module.
322 * See the user documentation for details on what it does.
323 *
324 * Results:
325 * A standard Tcl result.
326 *
327 * Side effects:
328 * See the user documentation.
329 *
330 *--------------------------------------------------------------
331 */
332
333static int
334ScaleWidgetCmd(clientData, interp, argc, argv)
335 ClientData clientData; /* Information about scale
336 * widget. */
337 Tcl_Interp *interp; /* Current interpreter. */
338 int argc; /* Number of arguments. */
339 char **argv; /* Argument strings. */
340{
341 register Scale *scalePtr = (Scale *) clientData;
342 int result = TCL_OK;
343 int length;
344 char c;
345
346 if (argc < 2) {
347 Tcl_AppendResult(interp, "wrong # args: should be \"",
348 argv[0], " option ?arg arg ...?\"", (char *) NULL);
349 return TCL_ERROR;
350 }
351 Tk_Preserve((ClientData) scalePtr);
352 c = argv[1][0];
353 length = strlen(argv[1]);
354 if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)) {
355 if (argc == 2) {
356 result = Tk_ConfigureInfo(interp, scalePtr->tkwin, configSpecs,
357 (char *) scalePtr, (char *) NULL, 0);
358 } else if (argc == 3) {
359 result = Tk_ConfigureInfo(interp, scalePtr->tkwin, configSpecs,
360 (char *) scalePtr, argv[2], 0);
361 } else {
362 result = ConfigureScale(interp, scalePtr, argc-2, argv+2,
363 TK_CONFIG_ARGV_ONLY);
364 }
365 } else if ((c == 'g') && (strncmp(argv[1], "get", length) == 0)) {
366 if (argc != 2) {
367 Tcl_AppendResult(interp, "wrong # args: should be \"",
368 argv[0], " get\"", (char *) NULL);
369 goto error;
370 }
371 sprintf(interp->result, "%d", scalePtr->value);
372 } else if ((c == 's') && (strncmp(argv[1], "set", length) == 0)) {
373 int value;
374
375 if (argc != 3) {
376 Tcl_AppendResult(interp, "wrong # args: should be \"",
377 argv[0], " set value\"", (char *) NULL);
378 goto error;
379 }
380 if (Tcl_GetInt(interp, argv[2], &value) != TCL_OK) {
381 goto error;
382 }
383 if (scalePtr->state == tkNormalUid) {
384 if ((value < scalePtr->fromValue)
385 ^ (scalePtr->toValue < scalePtr->fromValue)) {
386 value = scalePtr->fromValue;
387 }
388 if ((value > scalePtr->toValue)
389 ^ (scalePtr->toValue < scalePtr->fromValue)) {
390 value = scalePtr->toValue;
391 }
392 SetScaleValue(scalePtr, value);
393 }
394 } else {
395 Tcl_AppendResult(interp, "bad option \"", argv[1],
396 "\": must be configure, get, or set", (char *) NULL);
397 goto error;
398 }
399 Tk_Release((ClientData) scalePtr);
400 return result;
401
402 error:
403 Tk_Release((ClientData) scalePtr);
404 return TCL_ERROR;
405}
406\f
407/*
408 *----------------------------------------------------------------------
409 *
410 * DestroyScale --
411 *
412 * This procedure is invoked by Tk_EventuallyFree or Tk_Release
413 * to clean up the internal structure of a button at a safe time
414 * (when no-one is using it anymore).
415 *
416 * Results:
417 * None.
418 *
419 * Side effects:
420 * Everything associated with the scale is freed up.
421 *
422 *----------------------------------------------------------------------
423 */
424
425static void
426DestroyScale(clientData)
427 ClientData clientData; /* Info about scale widget. */
428{
429 register Scale *scalePtr = (Scale *) clientData;
430
431 if (scalePtr->command != NULL) {
432 ckfree(scalePtr->command);
433 }
434 if (scalePtr->label != NULL) {
435 ckfree(scalePtr->label);
436 }
437 if (scalePtr->bgBorder != NULL) {
438 Tk_Free3DBorder(scalePtr->bgBorder);
439 }
440 if (scalePtr->sliderBorder != NULL) {
441 Tk_Free3DBorder(scalePtr->sliderBorder);
442 }
443 if (scalePtr->activeBorder != NULL) {
444 Tk_Free3DBorder(scalePtr->activeBorder);
445 }
446 if (scalePtr->fontPtr != NULL) {
447 Tk_FreeFontStruct(scalePtr->fontPtr);
448 }
449 if (scalePtr->textColorPtr != NULL) {
450 Tk_FreeColor(scalePtr->textColorPtr);
451 }
452 if (scalePtr->textGC != None) {
453 Tk_FreeGC(scalePtr->textGC);
454 }
455 if (scalePtr->cursor != None) {
456 Tk_FreeCursor(scalePtr->cursor);
457 }
458 ckfree((char *) scalePtr);
459}
460\f
461/*
462 *----------------------------------------------------------------------
463 *
464 * ConfigureScale --
465 *
466 * This procedure is called to process an argv/argc list, plus
467 * the Tk option database, in order to configure (or
468 * reconfigure) a scale widget.
469 *
470 * Results:
471 * The return value is a standard Tcl result. If TCL_ERROR is
472 * returned, then interp->result contains an error message.
473 *
474 * Side effects:
475 * Configuration information, such as colors, border width,
476 * etc. get set for scalePtr; old resources get freed,
477 * if there were any.
478 *
479 *----------------------------------------------------------------------
480 */
481
482static int
483ConfigureScale(interp, scalePtr, argc, argv, flags)
484 Tcl_Interp *interp; /* Used for error reporting. */
485 register Scale *scalePtr; /* Information about widget; may or may
486 * not already have values for some fields. */
487 int argc; /* Number of valid entries in argv. */
488 char **argv; /* Arguments. */
489 int flags; /* Flags to pass to Tk_ConfigureWidget. */
490{
491 XGCValues gcValues;
492 GC newGC;
493 int length;
494
495 if (Tk_ConfigureWidget(interp, scalePtr->tkwin, configSpecs,
496 argc, argv, (char *) scalePtr, flags) != TCL_OK) {
497 return TCL_ERROR;
498 }
499
500 /*
501 * A few options need special processing, such as parsing the
502 * orientation or setting the background from a 3-D border.
503 */
504
505 length = strlen(scalePtr->orientUid);
506 if (strncmp(scalePtr->orientUid, "vertical", length) == 0) {
507 scalePtr->vertical = 1;
508 } else if (strncmp(scalePtr->orientUid, "horizontal", length) == 0) {
509 scalePtr->vertical = 0;
510 } else {
511 Tcl_AppendResult(interp, "bad orientation \"", scalePtr->orientUid,
512 "\": must be vertical or horizontal", (char *) NULL);
513 return TCL_ERROR;
514 }
515
516 if ((scalePtr->state != tkNormalUid)
517 && (scalePtr->state != tkDisabledUid)) {
518 Tcl_AppendResult(interp, "bad state value \"", scalePtr->state,
519 "\": must be normal or disabled", (char *) NULL);
520 scalePtr->state = tkNormalUid;
521 return TCL_ERROR;
522 }
523
524 /*
525 * Make sure that the tick interval has the right sign so that
526 * addition moves from fromValue to toValue.
527 */
528
529 if ((scalePtr->tickInterval < 0)
530 ^ ((scalePtr->toValue - scalePtr->fromValue) < 0)) {
531 scalePtr->tickInterval = -scalePtr->tickInterval;
532 }
533
534 /*
535 * Set the scale value to itself; all this does is to make sure
536 * that the scale's value is within the new acceptable range for
537 * the scale.
538 */
539
540 SetScaleValue(scalePtr, scalePtr->value);
541
542 if (scalePtr->command != NULL) {
543 scalePtr->commandLength = strlen(scalePtr->command);
544 } else {
545 scalePtr->commandLength = 0;
546 }
547
548 if (scalePtr->label != NULL) {
549 scalePtr->labelLength = strlen(scalePtr->label);
550 } else {
551 scalePtr->labelLength = 0;
552 }
553
554 Tk_SetBackgroundFromBorder(scalePtr->tkwin, scalePtr->bgBorder);
555
556 gcValues.font = scalePtr->fontPtr->fid;
557 gcValues.foreground = scalePtr->textColorPtr->pixel;
558 newGC = Tk_GetGC(scalePtr->tkwin, GCForeground|GCFont, &gcValues);
559 if (scalePtr->textGC != None) {
560 Tk_FreeGC(scalePtr->textGC);
561 }
562 scalePtr->textGC = newGC;
563
564 if (scalePtr->relief != TK_RELIEF_FLAT) {
565 scalePtr->offset = scalePtr->borderWidth;
566 } else {
567 scalePtr->offset = 0;
568 }
569
570 /*
571 * Recompute display-related information, and let the geometry
572 * manager know how much space is needed now.
573 */
574
575 ComputeScaleGeometry(scalePtr);
576
577 EventuallyRedrawScale(scalePtr, REDRAW_ALL);
578 return TCL_OK;
579}
580\f
581/*
582 *----------------------------------------------------------------------
583 *
584 * ComputeScaleGeometry --
585 *
586 * This procedure is called to compute various geometrical
587 * information for a scale, such as where various things get
588 * displayed. It's called when the window is reconfigured.
589 *
590 * Results:
591 * None.
592 *
593 * Side effects:
594 * Display-related numbers get changed in *scrollPtr. The
595 * geometry manager gets told about the window's preferred size.
596 *
597 *----------------------------------------------------------------------
598 */
599
600static void
601ComputeScaleGeometry(scalePtr)
602 register Scale *scalePtr; /* Information about widget. */
603{
604 XCharStruct bbox;
605 char valueString[30];
606 int dummy, lineHeight;
607
608 /*
609 * Horizontal scales are simpler than vertical ones because
610 * all sizes are the same (the height of a line of text);
611 * handle them first and then quit.
612 */
613
614 if (!scalePtr->vertical) {
615 lineHeight = scalePtr->fontPtr->ascent + scalePtr->fontPtr->descent;
616 if (scalePtr->tickInterval != 0) {
617 scalePtr->tickPixels = lineHeight;
618 } else {
619 scalePtr->tickPixels = 0;
620 }
621 if (scalePtr->showValue) {
622 scalePtr->valuePixels = lineHeight + SPACING;
623 } else {
624 scalePtr->valuePixels = 0;
625 }
626 if (scalePtr->labelLength != 0) {
627 scalePtr->labelPixels = lineHeight;
628 } else {
629 scalePtr->labelPixels = 0;
630 }
631
632 Tk_GeometryRequest(scalePtr->tkwin,
633 scalePtr->length + 2*scalePtr->offset,
634 scalePtr->tickPixels + scalePtr->valuePixels
635 + scalePtr->width + 2*scalePtr->borderWidth
636 + scalePtr->labelPixels + 2*scalePtr->offset);
637 Tk_SetInternalBorder(scalePtr->tkwin, scalePtr->borderWidth);
638 return;
639 }
640
641 /*
642 * Vertical scale: compute the amount of space needed for tick marks
643 * and current value by formatting strings for the two end points;
644 * use whichever length is longer.
645 */
646
647 sprintf(valueString, "%d", scalePtr->fromValue);
648 XTextExtents(scalePtr->fontPtr, valueString, strlen(valueString),
649 &dummy, &dummy, &dummy, &bbox);
650 scalePtr->tickPixels = bbox.rbearing + bbox.lbearing;
651 sprintf(valueString, "%d", scalePtr->toValue);
652 XTextExtents(scalePtr->fontPtr, valueString, strlen(valueString),
653 &dummy, &dummy, &dummy, &bbox);
654 if (scalePtr->tickPixels < bbox.rbearing + bbox.lbearing) {
655 scalePtr->tickPixels = bbox.rbearing + bbox.lbearing;
656 }
657
658 /*
659 * Pad the value with a bit of extra space for prettier printing.
660 */
661
662 scalePtr->tickPixels += scalePtr->fontPtr->ascent/2;
663 scalePtr->valuePixels = scalePtr->tickPixels;
664 if (scalePtr->tickInterval == 0) {
665 scalePtr->tickPixels = 0;
666 }
667 if (!scalePtr->showValue) {
668 scalePtr->valuePixels = 0;
669 }
670
671 if (scalePtr->labelLength == 0) {
672 scalePtr->labelPixels = 0;
673 } else {
674 XTextExtents(scalePtr->fontPtr, scalePtr->label,
675 scalePtr->labelLength, &dummy, &dummy, &dummy, &bbox);
676 scalePtr->labelPixels = bbox.rbearing + bbox.lbearing
677 + scalePtr->fontPtr->ascent;
678 }
679 Tk_GeometryRequest(scalePtr->tkwin, 4*scalePtr->borderWidth
680 + scalePtr->tickPixels + scalePtr->valuePixels + SPACING
681 + scalePtr->width + scalePtr->labelPixels,
682 scalePtr->length);
683 Tk_SetInternalBorder(scalePtr->tkwin, scalePtr->borderWidth);
684}
685\f
686/*
687 *--------------------------------------------------------------
688 *
689 * DisplayVerticalScale --
690 *
691 * This procedure redraws the contents of a vertical scale
692 * window. It is invoked as a do-when-idle handler, so it only
693 * runs when there's nothing else for the application to do.
694 *
695 * Results:
696 * None.
697 *
698 * Side effects:
699 * Information appears on the screen.
700 *
701 *--------------------------------------------------------------
702 */
703
704static void
705DisplayVerticalScale(clientData)
706 ClientData clientData; /* Information about widget. */
707{
708 register Scale *scalePtr = (Scale *) clientData;
709 register Tk_Window tkwin = scalePtr->tkwin;
710 int tickRightEdge, valueRightEdge, labelLeftEdge, scaleLeftEdge;
711 int totalPixels, x, y, width, height, shadowWidth, tickValue;
712 int relief;
713 Tk_3DBorder sliderBorder;
714
715 if ((scalePtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
716 goto done;
717 }
718
719 /*
720 * Scanning from left to right across the window, the window
721 * will contain four columns: ticks, value, scale, and label.
722 * Compute the x-coordinate for each of the columns.
723 */
724
725 totalPixels = scalePtr->tickPixels + scalePtr->valuePixels
726 + 2*scalePtr->borderWidth + scalePtr->width
727 + 2*SPACING + scalePtr->labelPixels;
728 tickRightEdge = (Tk_Width(tkwin) - totalPixels)/2 + scalePtr->tickPixels;
729 valueRightEdge = tickRightEdge + scalePtr->valuePixels;
730 scaleLeftEdge = valueRightEdge + SPACING;
731 labelLeftEdge = scaleLeftEdge + 2*scalePtr->borderWidth
732 + scalePtr->width + scalePtr->fontPtr->ascent/2;
733
734 /*
735 * Display the information from left to right across the window.
736 */
737
738 if (scalePtr->flags & REDRAW_OTHER) {
739 XClearWindow(Tk_Display(tkwin), Tk_WindowId(tkwin));
740
741 /*
742 * Display the tick marks.
743 */
744
745 if (scalePtr->tickPixels != 0) {
746 for (tickValue = scalePtr->fromValue; ;
747 tickValue += scalePtr->tickInterval) {
748 if (scalePtr->toValue > scalePtr->fromValue) {
749 if (tickValue > scalePtr->toValue) {
750 break;
751 }
752 } else {
753 if (tickValue < scalePtr->toValue) {
754 break;
755 }
756 }
757 DisplayVerticalValue(scalePtr, tickValue, tickRightEdge);
758 }
759 }
760 }
761
762 /*
763 * Display the value, if it is desired. If not redisplaying the
764 * entire window, clear the area of the value to get rid of the
765 * old value displayed there.
766 */
767
768 if (scalePtr->showValue) {
769 if (!(scalePtr->flags & REDRAW_OTHER)) {
770 XClearArea(Tk_Display(tkwin), Tk_WindowId(tkwin),
771 valueRightEdge-scalePtr->valuePixels, scalePtr->offset,
772 scalePtr->valuePixels,
773 Tk_Height(tkwin) - 2*scalePtr->offset, False);
774 }
775 DisplayVerticalValue(scalePtr, scalePtr->value, valueRightEdge);
776 }
777
778 /*
779 * Display the scale and the slider. If not redisplaying the
780 * entire window, must clear the trench area to erase the old
781 * slider, but don't need to redraw the border.
782 */
783
784 if (scalePtr->flags & REDRAW_OTHER) {
785 Tk_Draw3DRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin),
786 scalePtr->bgBorder, scaleLeftEdge, scalePtr->offset,
787 scalePtr->width + 2*scalePtr->borderWidth,
788 Tk_Height(tkwin) - 2*scalePtr->offset, scalePtr->borderWidth,
789 TK_RELIEF_SUNKEN);
790 } else {
791 XClearArea(Tk_Display(tkwin), Tk_WindowId(tkwin),
792 scaleLeftEdge + scalePtr->borderWidth,
793 scalePtr->offset + scalePtr->borderWidth,
794 scalePtr->width,
795 Tk_Height(tkwin) - 2*scalePtr->offset
796 - 2*scalePtr->borderWidth, False);
797 }
798 if (scalePtr->flags & ACTIVE) {
799 sliderBorder = scalePtr->activeBorder;
800 } else {
801 sliderBorder = scalePtr->sliderBorder;
802 }
803 width = scalePtr->width;
804 height = scalePtr->sliderLength/2;
805 x = scaleLeftEdge + scalePtr->borderWidth;
806 y = ValueToPixel(scalePtr, scalePtr->value) - height;
807 shadowWidth = scalePtr->borderWidth/2;
808 if (shadowWidth == 0) {
809 shadowWidth = 1;
810 }
811 relief = (scalePtr->flags & BUTTON_PRESSED) ? TK_RELIEF_SUNKEN
812 : TK_RELIEF_RAISED;
813 Tk_Draw3DRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin), sliderBorder,
814 x, y, width, 2*height, shadowWidth, relief);
815 x += shadowWidth;
816 y += shadowWidth;
817 width -= 2*shadowWidth;
818 height -= shadowWidth;
819 Tk_Fill3DRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin), sliderBorder,
820 x, y, width, height, shadowWidth, relief);
821 Tk_Fill3DRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin), sliderBorder,
822 x, y+height, width, height, shadowWidth, relief);
823
824 /*
825 * Draw the label to the right of the scale.
826 */
827
828 if ((scalePtr->flags & REDRAW_OTHER) && (scalePtr->labelPixels != 0)) {
829 XDrawString(Tk_Display(scalePtr->tkwin), Tk_WindowId(scalePtr->tkwin),
830 scalePtr->textGC, labelLeftEdge,
831 scalePtr->offset + (3*scalePtr->fontPtr->ascent)/2,
832 scalePtr->label, scalePtr->labelLength);
833 }
834
835 /*
836 * Draw the window border.
837 */
838
839 if ((scalePtr->flags & REDRAW_OTHER)
840 && (scalePtr->relief != TK_RELIEF_FLAT)) {
841 Tk_Draw3DRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin),
842 scalePtr->bgBorder, 0, 0, Tk_Width(tkwin), Tk_Height(tkwin),
843 scalePtr->borderWidth, scalePtr->relief);
844 }
845
846 done:
847 scalePtr->flags &= ~REDRAW_ALL;
848}
849\f
850/*
851 *----------------------------------------------------------------------
852 *
853 * DisplayVerticalValue --
854 *
855 * This procedure is called to display values (scale readings)
856 * for vertically-oriented scales.
857 *
858 * Results:
859 * None.
860 *
861 * Side effects:
862 * The numerical value corresponding to value is displayed with
863 * its right edge at "rightEdge", and at a vertical position in
864 * the scale that corresponds to "value".
865 *
866 *----------------------------------------------------------------------
867 */
868
869static void
870DisplayVerticalValue(scalePtr, value, rightEdge)
871 register Scale *scalePtr; /* Information about widget in which to
872 * display value. */
873 int value; /* Y-coordinate of number to display,
874 * specified in application coords, not
875 * in pixels (we'll compute pixels). */
876 int rightEdge; /* X-coordinate of right edge of text,
877 * specified in pixels. */
878{
879 register Tk_Window tkwin = scalePtr->tkwin;
880 int y, dummy, length;
881 char valueString[30];
882 XCharStruct bbox;
883
884 y = ValueToPixel(scalePtr, value) + scalePtr->fontPtr->ascent/2;
885 sprintf(valueString, "%d", value);
886 length = strlen(valueString);
887 XTextExtents(scalePtr->fontPtr, valueString, length,
888 &dummy, &dummy, &dummy, &bbox);
889
890 /*
891 * Adjust the y-coordinate if necessary to keep the text entirely
892 * inside the window.
893 */
894
895 if ((y - bbox.ascent) < scalePtr->offset) {
896 y = scalePtr->offset + bbox.ascent;
897 }
898 if ((y + bbox.descent) > (Tk_Height(tkwin) - scalePtr->offset)) {
899 y = Tk_Height(tkwin) - scalePtr->offset - bbox.descent;
900 }
901 XDrawString(Tk_Display(tkwin), Tk_WindowId(tkwin),
902 scalePtr->textGC, rightEdge - bbox.rbearing,
903 y, valueString, length);
904}
905\f
906/*
907 *--------------------------------------------------------------
908 *
909 * DisplayHorizontalScale --
910 *
911 * This procedure redraws the contents of a horizontal scale
912 * window. It is invoked as a do-when-idle handler, so it only
913 * runs when there's nothing else for the application to do.
914 *
915 * Results:
916 * None.
917 *
918 * Side effects:
919 * Information appears on the screen.
920 *
921 *--------------------------------------------------------------
922 */
923
924static void
925DisplayHorizontalScale(clientData)
926 ClientData clientData; /* Information about widget. */
927{
928 register Scale *scalePtr = (Scale *) clientData;
929 register Tk_Window tkwin = scalePtr->tkwin;
930 int tickBottom, valueBottom, labelBottom, scaleBottom;
931 int totalPixels, x, y, width, height, shadowWidth, tickValue;
932 int relief;
933 Tk_3DBorder sliderBorder;
934
935 if ((scalePtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
936 goto done;
937 }
938
939 /*
940 * Scanning from bottom to top across the window, the window
941 * will contain four rows: ticks, value, scale, and label.
942 * Compute the y-coordinate for each of the rows.
943 */
944
945 totalPixels = scalePtr->tickPixels + scalePtr->valuePixels
946 + 2*scalePtr->borderWidth + scalePtr->width
947 + scalePtr->labelPixels;
948 tickBottom = (Tk_Height(tkwin) + totalPixels)/2 - 1;
949 valueBottom = tickBottom - scalePtr->tickPixels;
950 scaleBottom = valueBottom - scalePtr->valuePixels;
951 labelBottom = scaleBottom - 2*scalePtr->borderWidth - scalePtr->width;
952
953 /*
954 * Display the information from bottom to top across the window.
955 */
956
957 if (scalePtr->flags & REDRAW_OTHER) {
958 XClearWindow(Tk_Display(tkwin), Tk_WindowId(tkwin));
959
960 /*
961 * Display the tick marks.
962 */
963
964 if (scalePtr->tickPixels != 0) {
965 for (tickValue = scalePtr->fromValue; ;
966 tickValue += scalePtr->tickInterval) {
967 if (scalePtr->toValue > scalePtr->fromValue) {
968 if (tickValue > scalePtr->toValue) {
969 break;
970 }
971 } else {
972 if (tickValue < scalePtr->toValue) {
973 break;
974 }
975 }
976 DisplayHorizontalValue(scalePtr, tickValue, tickBottom);
977 }
978 }
979 }
980
981 /*
982 * Display the value, if it is desired. If not redisplaying the
983 * entire window, clear the area of the value to get rid of the
984 * old value displayed there.
985 */
986
987 if (scalePtr->showValue) {
988 if (!(scalePtr->flags & REDRAW_OTHER)) {
989 XClearArea(Tk_Display(tkwin), Tk_WindowId(tkwin),
990 scalePtr->offset, scaleBottom + 1,
991 Tk_Width(tkwin) - 2*scalePtr->offset,
992 valueBottom - scaleBottom, False);
993 }
994 DisplayHorizontalValue(scalePtr, scalePtr->value, valueBottom);
995 }
996
997 /*
998 * Display the scale and the slider. If not redisplaying the
999 * entire window, must clear the trench area to erase the old
1000 * slider, but don't need to redraw the border.
1001 */
1002
1003 y = scaleBottom - 2*scalePtr->borderWidth - scalePtr->width + 1;
1004 if (scalePtr->flags & REDRAW_OTHER) {
1005 Tk_Draw3DRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin),
1006 scalePtr->bgBorder, scalePtr->offset, y,
1007 Tk_Width(tkwin) - 2*scalePtr->offset,
1008 scalePtr->width + 2*scalePtr->borderWidth,
1009 scalePtr->borderWidth, TK_RELIEF_SUNKEN);
1010 } else {
1011 XClearArea(Tk_Display(tkwin), Tk_WindowId(tkwin),
1012 scalePtr->offset + scalePtr->borderWidth,
1013 y + scalePtr->borderWidth,
1014 Tk_Width(tkwin) - 2*scalePtr->offset - 2*scalePtr->borderWidth,
1015 scalePtr->width, False);
1016 }
1017 if (scalePtr->flags & ACTIVE) {
1018 sliderBorder = scalePtr->activeBorder;
1019 } else {
1020 sliderBorder = scalePtr->sliderBorder;
1021 }
1022 width = scalePtr->sliderLength/2;
1023 height = scalePtr->width;
1024 x = ValueToPixel(scalePtr, scalePtr->value) - width;
1025 y += scalePtr->borderWidth;
1026 shadowWidth = scalePtr->borderWidth/2;
1027 if (shadowWidth == 0) {
1028 shadowWidth = 1;
1029 }
1030 relief = (scalePtr->flags & BUTTON_PRESSED) ? TK_RELIEF_SUNKEN
1031 : TK_RELIEF_RAISED;
1032 Tk_Draw3DRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin), sliderBorder,
1033 x, y, 2*width, height, shadowWidth, relief);
1034 x += shadowWidth;
1035 y += shadowWidth;
1036 width -= shadowWidth;
1037 height -= 2*shadowWidth;
1038 Tk_Fill3DRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin), sliderBorder,
1039 x, y, width, height, shadowWidth, relief);
1040 Tk_Fill3DRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin), sliderBorder,
1041 x+width, y, width, height, shadowWidth, relief);
1042
1043 /*
1044 * Draw the label to the top of the scale.
1045 */
1046
1047 if ((scalePtr->flags & REDRAW_OTHER) && (scalePtr->labelPixels != 0)) {
1048 XDrawString(Tk_Display(scalePtr->tkwin), Tk_WindowId(scalePtr->tkwin),
1049 scalePtr->textGC, scalePtr->offset + scalePtr->fontPtr->ascent/2,
1050 labelBottom - scalePtr->fontPtr->descent,
1051 scalePtr->label, scalePtr->labelLength);
1052 }
1053
1054 /*
1055 * Draw the window border.
1056 */
1057
1058 if ((scalePtr->flags & REDRAW_OTHER)
1059 && (scalePtr->relief != TK_RELIEF_FLAT)) {
1060 Tk_Draw3DRectangle(Tk_Display(tkwin), Tk_WindowId(tkwin),
1061 scalePtr->bgBorder, 0, 0, Tk_Width(tkwin), Tk_Height(tkwin),
1062 scalePtr->borderWidth, scalePtr->relief);
1063 }
1064
1065 done:
1066 scalePtr->flags &= ~REDRAW_ALL;
1067}
1068\f
1069/*
1070 *----------------------------------------------------------------------
1071 *
1072 * DisplayHorizontalValue --
1073 *
1074 * This procedure is called to display values (scale readings)
1075 * for horizontally-oriented scales.
1076 *
1077 * Results:
1078 * None.
1079 *
1080 * Side effects:
1081 * The numerical value corresponding to value is displayed with
1082 * its bottom edge at "bottom", and at a horizontal position in
1083 * the scale that corresponds to "value".
1084 *
1085 *----------------------------------------------------------------------
1086 */
1087
1088static void
1089DisplayHorizontalValue(scalePtr, value, bottom)
1090 register Scale *scalePtr; /* Information about widget in which to
1091 * display value. */
1092 int value; /* Y-coordinate of number to display,
1093 * specified in application coords, not
1094 * in pixels (we'll compute pixels). */
1095 int bottom; /* Y-coordinate of bottom edge of text,
1096 * specified in pixels. */
1097{
1098 register Tk_Window tkwin = scalePtr->tkwin;
1099 int x, y, dummy, length;
1100 char valueString[30];
1101 XCharStruct bbox;
1102
1103 x = ValueToPixel(scalePtr, value);
1104 y = bottom - scalePtr->fontPtr->descent;
1105 sprintf(valueString, "%d", value);
1106 length = strlen(valueString);
1107 XTextExtents(scalePtr->fontPtr, valueString, length,
1108 &dummy, &dummy, &dummy, &bbox);
1109
1110 /*
1111 * Adjust the x-coordinate if necessary to keep the text entirely
1112 * inside the window.
1113 */
1114
1115 x -= (bbox.lbearing + bbox.rbearing)/2;
1116 if ((x - bbox.lbearing) < scalePtr->offset) {
1117 x = scalePtr->offset + bbox.lbearing;
1118 }
1119 if ((y + bbox.rbearing) > (Tk_Width(tkwin) - scalePtr->offset)) {
1120 x = Tk_Width(tkwin) - scalePtr->offset - bbox.rbearing;
1121 }
1122 XDrawString(Tk_Display(tkwin), Tk_WindowId(tkwin),
1123 scalePtr->textGC, x, y, valueString, length);
1124}
1125\f
1126/*
1127 *----------------------------------------------------------------------
1128 *
1129 * PixelToValue --
1130 *
1131 * Given a pixel within a scale window, return the scale
1132 * reading corresponding to that pixel.
1133 *
1134 * Results:
1135 * An integer scale reading.
1136 *
1137 * Side effects:
1138 * None.
1139 *
1140 *----------------------------------------------------------------------
1141 */
1142
1143static int
1144PixelToValue(scalePtr, x, y)
1145 register Scale *scalePtr; /* Information about widget. */
1146 int x, y; /* Coordinates of point within
1147 * window. */
1148{
1149 int value, pixelRange;
1150
1151 if (scalePtr->vertical) {
1152 pixelRange = Tk_Height(scalePtr->tkwin) - scalePtr->sliderLength
1153 - 2*scalePtr->offset - 2*scalePtr->borderWidth;
1154 value = y;
1155 } else {
1156 pixelRange = Tk_Width(scalePtr->tkwin) - scalePtr->sliderLength
1157 - 2*scalePtr->offset - 2*scalePtr->borderWidth;
1158 value = x;
1159 }
1160
1161 if (pixelRange <= 0) {
1162 /*
1163 * Not enough room for the slider to actually slide: just return
1164 * the scale's current value.
1165 */
1166
1167 return scalePtr->value;
1168 }
1169 value -= scalePtr->sliderLength/2 + scalePtr->offset
1170 + scalePtr->borderWidth;
1171 if (value < 0) {
1172 value = 0;
1173 }
1174 if (value > pixelRange) {
1175 value = pixelRange;
1176 }
1177 if (scalePtr->toValue > scalePtr->fromValue) {
1178 value = scalePtr->fromValue +
1179 ((value * (scalePtr->toValue - scalePtr->fromValue))
1180 + pixelRange/2)/pixelRange;
1181 } else {
1182 value = scalePtr->toValue +
1183 (((pixelRange - value)
1184 * (scalePtr->fromValue - scalePtr->toValue))
1185 + pixelRange/2)/pixelRange;
1186 }
1187 return value;
1188}
1189\f
1190/*
1191 *----------------------------------------------------------------------
1192 *
1193 * ValueToPixel --
1194 *
1195 * Given a reading of the scale, return the x-coordinate or
1196 * y-coordinate corresponding to that reading, depending on
1197 * whether the scale is vertical or horizontal, respectively.
1198 *
1199 * Results:
1200 * An integer value giving the pixel location corresponding
1201 * to reading. The value is restricted to lie within the
1202 * defined range for the scale.
1203 *
1204 * Side effects:
1205 * None.
1206 *
1207 *----------------------------------------------------------------------
1208 */
1209
1210static int
1211ValueToPixel(scalePtr, value)
1212 register Scale *scalePtr; /* Information about widget. */
1213 int value; /* Reading of the widget. */
1214{
1215 int y, pixelRange, valueRange;
1216
1217 valueRange = scalePtr->toValue - scalePtr->fromValue;
1218 pixelRange = (scalePtr->vertical ? Tk_Height(scalePtr->tkwin)
1219 : Tk_Width(scalePtr->tkwin)) - scalePtr->sliderLength
1220 - 2*scalePtr->offset - 2*scalePtr->borderWidth;
1221 y = ((value - scalePtr->fromValue) * pixelRange
1222 + valueRange/2) / valueRange;
1223 if (y < 0) {
1224 y = 0;
1225 } else if (y > pixelRange) {
1226 y = pixelRange;
1227 }
1228 y += scalePtr->sliderLength/2 + scalePtr->offset + scalePtr->borderWidth;
1229 return y;
1230}
1231\f
1232/*
1233 *--------------------------------------------------------------
1234 *
1235 * ScaleEventProc --
1236 *
1237 * This procedure is invoked by the Tk dispatcher for various
1238 * events on scales.
1239 *
1240 * Results:
1241 * None.
1242 *
1243 * Side effects:
1244 * When the window gets deleted, internal structures get
1245 * cleaned up. When it gets exposed, it is redisplayed.
1246 *
1247 *--------------------------------------------------------------
1248 */
1249
1250static void
1251ScaleEventProc(clientData, eventPtr)
1252 ClientData clientData; /* Information about window. */
1253 XEvent *eventPtr; /* Information about event. */
1254{
1255 Scale *scalePtr = (Scale *) clientData;
1256
1257 if ((eventPtr->type == Expose) && (eventPtr->xexpose.count == 0)) {
1258 EventuallyRedrawScale(scalePtr, REDRAW_ALL);
1259 } else if (eventPtr->type == DestroyNotify) {
1260 Tcl_DeleteCommand(scalePtr->interp, Tk_PathName(scalePtr->tkwin));
1261 scalePtr->tkwin = NULL;
1262 if (scalePtr->flags & REDRAW_ALL) {
1263 if (scalePtr->vertical) {
1264 Tk_CancelIdleCall(DisplayVerticalScale, (ClientData) scalePtr);
1265 } else {
1266 Tk_CancelIdleCall(DisplayHorizontalScale,
1267 (ClientData) scalePtr);
1268 }
1269 }
1270 Tk_EventuallyFree((ClientData) scalePtr, DestroyScale);
1271 } else if (eventPtr->type == ConfigureNotify) {
1272 ComputeScaleGeometry(scalePtr);
1273 }
1274}
1275\f
1276/*
1277 *--------------------------------------------------------------
1278 *
1279 * ScaleMouseProc --
1280 *
1281 * This procedure is called back by Tk in response to
1282 * mouse events such as window entry, window exit, mouse
1283 * motion, and button presses.
1284 *
1285 * Results:
1286 * None.
1287 *
1288 * Side effects:
1289 * This procedure implements the "feel" of the scale by
1290 * issuing commands in response to button presses and mouse
1291 * motion.
1292 *
1293 *--------------------------------------------------------------
1294 */
1295
1296static void
1297ScaleMouseProc(clientData, eventPtr)
1298 ClientData clientData; /* Information about window. */
1299 register XEvent *eventPtr; /* Information about event. */
1300{
1301 register Scale *scalePtr = (Scale *) clientData;
1302
1303 if (scalePtr->state != tkNormalUid) {
1304 return;
1305 }
1306
1307 Tk_Preserve((ClientData) scalePtr);
1308 if (eventPtr->type == EnterNotify) {
1309 scalePtr->flags |= ACTIVE;
1310 EventuallyRedrawScale(scalePtr, REDRAW_SLIDER);
1311 } else if (eventPtr->type == LeaveNotify) {
1312 scalePtr->flags &= ~ACTIVE;
1313 EventuallyRedrawScale(scalePtr, REDRAW_SLIDER);
1314 } else if ((eventPtr->type == MotionNotify)
1315 && (scalePtr->flags & BUTTON_PRESSED)) {
1316 SetScaleValue(scalePtr, PixelToValue(scalePtr,
1317 eventPtr->xmotion.x, eventPtr->xmotion.y));
1318 } else if ((eventPtr->type == ButtonPress)
1319/* && (eventPtr->xbutton.button == Button1) */
1320 && (eventPtr->xbutton.state == 0)) {
1321 scalePtr->flags |= BUTTON_PRESSED;
1322 SetScaleValue(scalePtr, PixelToValue(scalePtr,
1323 eventPtr->xbutton.x, eventPtr->xbutton.y));
1324 EventuallyRedrawScale(scalePtr, REDRAW_SLIDER);
1325 } else if ((eventPtr->type == ButtonRelease)
1326/* && (eventPtr->xbutton.button == Button1) */
1327 && (scalePtr->flags & BUTTON_PRESSED)) {
1328 scalePtr->flags &= ~BUTTON_PRESSED;
1329 EventuallyRedrawScale(scalePtr, REDRAW_SLIDER);
1330 }
1331 Tk_Release((ClientData) scalePtr);
1332}
1333\f
1334/*
1335 *--------------------------------------------------------------
1336 *
1337 * SetScaleValue --
1338 *
1339 * This procedure changes the value of a scale and invokes
1340 * a Tcl command to reflect the current position of a scale
1341 *
1342 * Results:
1343 * None.
1344 *
1345 * Side effects:
1346 * A Tcl command is invoked, and an additional error-processing
1347 * command may also be invoked. The scale's slider is redrawn.
1348 *
1349 *--------------------------------------------------------------
1350 */
1351
1352static void
1353SetScaleValue(scalePtr, value)
1354 register Scale *scalePtr; /* Info about widget. */
1355 int value; /* New value for scale. Gets
1356 * adjusted if it's off the scale. */
1357{
1358 int result;
1359 char string[20];
1360
1361 if ((value < scalePtr->fromValue)
1362 ^ (scalePtr->toValue < scalePtr->fromValue)) {
1363 value = scalePtr->fromValue;
1364 }
1365 if ((value > scalePtr->toValue)
1366 ^ (scalePtr->toValue < scalePtr->fromValue)) {
1367 value = scalePtr->toValue;
1368 }
1369 if (value == scalePtr->value) {
1370 return;
1371 }
1372 scalePtr->value = value;
1373 EventuallyRedrawScale(scalePtr, REDRAW_SLIDER);
1374
1375 sprintf(string, " %d", scalePtr->value);
1376 result = Tcl_VarEval(scalePtr->interp, scalePtr->command, string,
1377 (char *) NULL);
1378 if (result != TCL_OK) {
1379 TkBindError(scalePtr->interp);
1380 }
1381}
1382\f
1383/*
1384 *--------------------------------------------------------------
1385 *
1386 * EventuallyRedrawScale --
1387 *
1388 * Arrange for part or all of a scale widget to redrawn at
1389 * the next convenient time in the future.
1390 *
1391 * Results:
1392 * None.
1393 *
1394 * Side effects:
1395 * If "what" is REDRAW_SLIDER then just the slider and the
1396 * value readout will be redrawn; if "what" is REDRAW_ALL
1397 * then the entire widget will be redrawn.
1398 *
1399 *--------------------------------------------------------------
1400 */
1401
1402static void
1403EventuallyRedrawScale(scalePtr, what)
1404 register Scale *scalePtr; /* Information about widget. */
1405 int what; /* What to redraw: REDRAW_SLIDER
1406 * or REDRAW_ALL. */
1407{
1408 if ((what == 0) || (scalePtr->tkwin == NULL)
1409 || !Tk_IsMapped(scalePtr->tkwin)) {
1410 return;
1411 }
1412 if ((scalePtr->flags & REDRAW_ALL) == 0) {
1413 if (scalePtr->vertical) {
1414 Tk_DoWhenIdle(DisplayVerticalScale, (ClientData) scalePtr);
1415 } else {
1416 Tk_DoWhenIdle(DisplayHorizontalScale, (ClientData) scalePtr);
1417 }
1418 }
1419 scalePtr->flags |= what;
1420}
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