File: tkUnixScrlbr.c

package info (click to toggle)
saods9 3.0.3-1
  • links: PTS
  • area: main
  • in suites: sarge
  • size: 86,868 kB
  • ctags: 82,021
  • sloc: ansic: 663,637; tcl: 111,403; cpp: 52,727; sh: 27,784; makefile: 6,177; asm: 3,355; lex: 2,890; ada: 1,637; pascal: 1,621; xml: 1,221; yacc: 883; f90: 84; perl: 82; python: 33; fortran: 17; ruby: 13; sed: 12; php: 11
file content (476 lines) | stat: -rw-r--r-- 13,934 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
/* 
 * tkUnixScrollbar.c --
 *
 *	This file implements the Unix specific portion of the scrollbar
 *	widget.
 *
 * Copyright (c) 1996 by Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tkUnixScrlbr.c,v 1.1.1.1 2004/04/02 22:35:05 joye Exp $
 */

#include "tkScrollbar.h"

/*
 * Minimum slider length, in pixels (designed to make sure that the slider
 * is always easy to grab with the mouse).
 */

#define MIN_SLIDER_LENGTH	5

/*
 * Declaration of Unix specific scrollbar structure.
 */

typedef struct UnixScrollbar {
    TkScrollbar info;		/* Generic scrollbar info. */
    GC troughGC;		/* For drawing trough. */
    GC copyGC;			/* Used for copying from pixmap onto screen. */
} UnixScrollbar;

/*
 * The class procedure table for the scrollbar widget.  All fields except
 * size are left initialized to NULL, which should happen automatically
 * since the variable is declared at this scope.
 */

Tk_ClassProcs tkpScrollbarProcs = {
    sizeof(Tk_ClassProcs)	/* size */
};


/*
 *----------------------------------------------------------------------
 *
 * TkpCreateScrollbar --
 *
 *	Allocate a new TkScrollbar structure.
 *
 * Results:
 *	Returns a newly allocated TkScrollbar structure.
 *
 * Side effects:
 *	Registers an event handler for the widget.
 *
 *----------------------------------------------------------------------
 */

TkScrollbar *
TkpCreateScrollbar(tkwin)
    Tk_Window tkwin;
{
    UnixScrollbar *scrollPtr = (UnixScrollbar *)ckalloc(sizeof(UnixScrollbar));
    scrollPtr->troughGC = None;
    scrollPtr->copyGC = None;

    Tk_CreateEventHandler(tkwin,
	    ExposureMask|StructureNotifyMask|FocusChangeMask,
	    TkScrollbarEventProc, (ClientData) scrollPtr);

    return (TkScrollbar *) scrollPtr;
}

/*
 *--------------------------------------------------------------
 *
 * TkpDisplayScrollbar --
 *
 *	This procedure redraws the contents of a scrollbar window.
 *	It is invoked as a do-when-idle handler, so it only runs
 *	when there's nothing else for the application to do.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Information appears on the screen.
 *
 *--------------------------------------------------------------
 */

void
TkpDisplayScrollbar(clientData)
    ClientData clientData;	/* Information about window. */
{
    register TkScrollbar *scrollPtr = (TkScrollbar *) clientData;
    register Tk_Window tkwin = scrollPtr->tkwin;
    XPoint points[7];
    Tk_3DBorder border;
    int relief, width, elementBorderWidth;
    Pixmap pixmap;

    if ((scrollPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
	goto done;
    }

    if (scrollPtr->vertical) {
	width = Tk_Width(tkwin) - 2*scrollPtr->inset;
    } else {
	width = Tk_Height(tkwin) - 2*scrollPtr->inset;
    }
    elementBorderWidth = scrollPtr->elementBorderWidth;
    if (elementBorderWidth < 0) {
	elementBorderWidth = scrollPtr->borderWidth;
    }

    /*
     * In order to avoid screen flashes, this procedure redraws
     * the scrollbar 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 = Tk_GetPixmap(scrollPtr->display, Tk_WindowId(tkwin),
	    Tk_Width(tkwin), Tk_Height(tkwin), Tk_Depth(tkwin));

    if (scrollPtr->highlightWidth != 0) {
	GC gc;

	if (scrollPtr->flags & GOT_FOCUS) {
	    gc = Tk_GCForColor(scrollPtr->highlightColorPtr, pixmap);
	} else {
	    gc = Tk_GCForColor(scrollPtr->highlightBgColorPtr, pixmap);
	}
	Tk_DrawFocusHighlight(tkwin, gc, scrollPtr->highlightWidth, pixmap);
    }
    Tk_Draw3DRectangle(tkwin, pixmap, scrollPtr->bgBorder,
	    scrollPtr->highlightWidth, scrollPtr->highlightWidth,
	    Tk_Width(tkwin) - 2*scrollPtr->highlightWidth,
	    Tk_Height(tkwin) - 2*scrollPtr->highlightWidth,
	    scrollPtr->borderWidth, scrollPtr->relief);
    XFillRectangle(scrollPtr->display, pixmap,
	    ((UnixScrollbar*)scrollPtr)->troughGC,
	    scrollPtr->inset, scrollPtr->inset,
	    (unsigned) (Tk_Width(tkwin) - 2*scrollPtr->inset),
	    (unsigned) (Tk_Height(tkwin) - 2*scrollPtr->inset));

    /*
     * Draw the top or left arrow.  The coordinates of the polygon
     * points probably seem odd, but they were carefully chosen with
     * respect to X's rules for filling polygons.  These point choices
     * cause the arrows to just fill the narrow dimension of the
     * scrollbar and be properly centered.
     */

    if (scrollPtr->activeField == TOP_ARROW) {
	border = scrollPtr->activeBorder;
	relief = scrollPtr->activeField == TOP_ARROW ? scrollPtr->activeRelief
		: TK_RELIEF_RAISED;
    } else {
	border = scrollPtr->bgBorder;
	relief = TK_RELIEF_RAISED;
    }
    if (scrollPtr->vertical) {
	points[0].x = scrollPtr->inset - 1;
	points[0].y = scrollPtr->arrowLength + scrollPtr->inset - 1;
	points[1].x = width + scrollPtr->inset;
	points[1].y = points[0].y;
	points[2].x = width/2 + scrollPtr->inset;
	points[2].y = scrollPtr->inset - 1;
	Tk_Fill3DPolygon(tkwin, pixmap, border, points, 3,
		elementBorderWidth, relief);
    } else {
	points[0].x = scrollPtr->arrowLength + scrollPtr->inset - 1;
	points[0].y = scrollPtr->inset - 1;
	points[1].x = scrollPtr->inset;
	points[1].y = width/2 + scrollPtr->inset;
	points[2].x = points[0].x;
	points[2].y = width + scrollPtr->inset;
	Tk_Fill3DPolygon(tkwin, pixmap, border, points, 3,
		elementBorderWidth, relief);
    }

    /*
     * Display the bottom or right arrow.
     */

    if (scrollPtr->activeField == BOTTOM_ARROW) {
	border = scrollPtr->activeBorder;
	relief = scrollPtr->activeField == BOTTOM_ARROW
		? scrollPtr->activeRelief : TK_RELIEF_RAISED;
    } else {
	border = scrollPtr->bgBorder;
	relief = TK_RELIEF_RAISED;
    }
    if (scrollPtr->vertical) {
	points[0].x = scrollPtr->inset;
	points[0].y = Tk_Height(tkwin) - scrollPtr->arrowLength
		- scrollPtr->inset + 1;
	points[1].x = width/2 + scrollPtr->inset;
	points[1].y = Tk_Height(tkwin) - scrollPtr->inset;
	points[2].x = width + scrollPtr->inset;
	points[2].y = points[0].y;
	Tk_Fill3DPolygon(tkwin, pixmap, border,
		points, 3, elementBorderWidth, relief);
    } else {
	points[0].x = Tk_Width(tkwin) - scrollPtr->arrowLength
		- scrollPtr->inset + 1;
	points[0].y = scrollPtr->inset - 1;
	points[1].x = points[0].x;
	points[1].y = width + scrollPtr->inset;
	points[2].x = Tk_Width(tkwin) - scrollPtr->inset;
	points[2].y = width/2 + scrollPtr->inset;
	Tk_Fill3DPolygon(tkwin, pixmap, border,
		points, 3, elementBorderWidth, relief);
    }

    /*
     * Display the slider.
     */

    if (scrollPtr->activeField == SLIDER) {
	border = scrollPtr->activeBorder;
	relief = scrollPtr->activeField == SLIDER ? scrollPtr->activeRelief
		: TK_RELIEF_RAISED;
    } else {
	border = scrollPtr->bgBorder;
	relief = TK_RELIEF_RAISED;
    }
    if (scrollPtr->vertical) {
	Tk_Fill3DRectangle(tkwin, pixmap, border,
		scrollPtr->inset, scrollPtr->sliderFirst,
		width, scrollPtr->sliderLast - scrollPtr->sliderFirst,
		elementBorderWidth, relief);
    } else {
	Tk_Fill3DRectangle(tkwin, pixmap, border,
		scrollPtr->sliderFirst, scrollPtr->inset,
		scrollPtr->sliderLast - scrollPtr->sliderFirst, width,
		elementBorderWidth, relief);
    }

    /*
     * Copy the information from the off-screen pixmap onto the screen,
     * then delete the pixmap.
     */

    XCopyArea(scrollPtr->display, pixmap, Tk_WindowId(tkwin),
	    ((UnixScrollbar*)scrollPtr)->copyGC, 0, 0,
	    (unsigned) Tk_Width(tkwin), (unsigned) Tk_Height(tkwin), 0, 0);
    Tk_FreePixmap(scrollPtr->display, pixmap);

    done:
    scrollPtr->flags &= ~REDRAW_PENDING;
}

/*
 *----------------------------------------------------------------------
 *
 * TkpComputeScrollbarGeometry --
 *
 *	After changes in a scrollbar's size or configuration, this
 *	procedure recomputes various geometry information used in
 *	displaying the scrollbar.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The scrollbar will be displayed differently.
 *
 *----------------------------------------------------------------------
 */

extern void
TkpComputeScrollbarGeometry(scrollPtr)
    register TkScrollbar *scrollPtr;	/* Scrollbar whose geometry may
					 * have changed. */
{
    int width, fieldLength;

    if (scrollPtr->highlightWidth < 0) {
	scrollPtr->highlightWidth = 0;
    }
    scrollPtr->inset = scrollPtr->highlightWidth + scrollPtr->borderWidth;
    width = (scrollPtr->vertical) ? Tk_Width(scrollPtr->tkwin)
	    : Tk_Height(scrollPtr->tkwin);
    scrollPtr->arrowLength = width - 2*scrollPtr->inset + 1;
    fieldLength = (scrollPtr->vertical ? Tk_Height(scrollPtr->tkwin)
	    : Tk_Width(scrollPtr->tkwin))
	    - 2*(scrollPtr->arrowLength + scrollPtr->inset);
    if (fieldLength < 0) {
	fieldLength = 0;
    }
    scrollPtr->sliderFirst = fieldLength*scrollPtr->firstFraction;
    scrollPtr->sliderLast = fieldLength*scrollPtr->lastFraction;

    /*
     * Adjust the slider so that some piece of it is always
     * displayed in the scrollbar and so that it has at least
     * a minimal width (so it can be grabbed with the mouse).
     */

    if (scrollPtr->sliderFirst > (fieldLength - 2*scrollPtr->borderWidth)) {
	scrollPtr->sliderFirst = fieldLength - 2*scrollPtr->borderWidth;
    }
    if (scrollPtr->sliderFirst < 0) {
	scrollPtr->sliderFirst = 0;
    }
    if (scrollPtr->sliderLast < (scrollPtr->sliderFirst
	    + MIN_SLIDER_LENGTH)) {
	scrollPtr->sliderLast = scrollPtr->sliderFirst + MIN_SLIDER_LENGTH;
    }
    if (scrollPtr->sliderLast > fieldLength) {
	scrollPtr->sliderLast = fieldLength;
    }
    scrollPtr->sliderFirst += scrollPtr->arrowLength + scrollPtr->inset;
    scrollPtr->sliderLast += scrollPtr->arrowLength + scrollPtr->inset;

    /*
     * Register the desired geometry for the window (leave enough space
     * for the two arrows plus a minimum-size slider, plus border around
     * the whole window, if any).  Then arrange for the window to be
     * redisplayed.
     */

    if (scrollPtr->vertical) {
	Tk_GeometryRequest(scrollPtr->tkwin,
		scrollPtr->width + 2*scrollPtr->inset,
		2*(scrollPtr->arrowLength + scrollPtr->borderWidth
		+ scrollPtr->inset));
    } else {
	Tk_GeometryRequest(scrollPtr->tkwin,
		2*(scrollPtr->arrowLength + scrollPtr->borderWidth
		+ scrollPtr->inset), scrollPtr->width + 2*scrollPtr->inset);
    }
    Tk_SetInternalBorder(scrollPtr->tkwin, scrollPtr->inset);
}

/*
 *----------------------------------------------------------------------
 *
 * TkpDestroyScrollbar --
 *
 *	Free data structures associated with the scrollbar control.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Frees the GCs associated with the scrollbar.
 *
 *----------------------------------------------------------------------
 */

void
TkpDestroyScrollbar(scrollPtr)
    TkScrollbar *scrollPtr;
{
    UnixScrollbar *unixScrollPtr = (UnixScrollbar *)scrollPtr;

    if (unixScrollPtr->troughGC != None) {
	Tk_FreeGC(scrollPtr->display, unixScrollPtr->troughGC);
    }
    if (unixScrollPtr->copyGC != None) {
	Tk_FreeGC(scrollPtr->display, unixScrollPtr->copyGC);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TkpConfigureScrollbar --
 *
 *	This procedure is called after the generic code has finished
 *	processing configuration options, in order to configure
 *	platform specific options.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Configuration info may get changed.
 *
 *----------------------------------------------------------------------
 */

void
TkpConfigureScrollbar(scrollPtr)
    register TkScrollbar *scrollPtr;	/* Information about widget;  may or
					 * may not already have values for
					 * some fields. */
{
    XGCValues gcValues;
    GC new;
    UnixScrollbar *unixScrollPtr = (UnixScrollbar *) scrollPtr;

    Tk_SetBackgroundFromBorder(scrollPtr->tkwin, scrollPtr->bgBorder);

    gcValues.foreground = scrollPtr->troughColorPtr->pixel;
    new = Tk_GetGC(scrollPtr->tkwin, GCForeground, &gcValues);
    if (unixScrollPtr->troughGC != None) {
	Tk_FreeGC(scrollPtr->display, unixScrollPtr->troughGC);
    }
    unixScrollPtr->troughGC = new;
    if (unixScrollPtr->copyGC == None) {
	gcValues.graphics_exposures = False;
	unixScrollPtr->copyGC = Tk_GetGC(scrollPtr->tkwin, GCGraphicsExposures,
	    &gcValues);
    }
}

/*
 *--------------------------------------------------------------
 *
 * TkpScrollbarPosition --
 *
 *	Determine the scrollbar element corresponding to a
 *	given position.
 *
 * Results:
 *	One of TOP_ARROW, TOP_GAP, etc., indicating which element
 *	of the scrollbar covers the position given by (x, y).  If
 *	(x,y) is outside the scrollbar entirely, then OUTSIDE is
 *	returned.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

int
TkpScrollbarPosition(scrollPtr, x, y)
    register TkScrollbar *scrollPtr;	/* Scrollbar widget record. */
    int x, y;				/* Coordinates within scrollPtr's
					 * window. */
{
    int length, width, tmp;

    if (scrollPtr->vertical) {
	length = Tk_Height(scrollPtr->tkwin);
	width = Tk_Width(scrollPtr->tkwin);
    } else {
	tmp = x;
	x = y;
	y = tmp;
	length = Tk_Width(scrollPtr->tkwin);
	width = Tk_Height(scrollPtr->tkwin);
    }

    if ((x < scrollPtr->inset) || (x >= (width - scrollPtr->inset))
	    || (y < scrollPtr->inset) || (y >= (length - scrollPtr->inset))) {
	return OUTSIDE;
    }

    /*
     * All of the calculations in this procedure mirror those in
     * TkpDisplayScrollbar.  Be sure to keep the two consistent.
     */

    if (y < (scrollPtr->inset + scrollPtr->arrowLength)) {
	return TOP_ARROW;
    }
    if (y < scrollPtr->sliderFirst) {
	return TOP_GAP;
    }
    if (y < scrollPtr->sliderLast) {
	return SLIDER;
    }
    if (y >= (length - (scrollPtr->arrowLength + scrollPtr->inset))) {
	return BOTTOM_ARROW;
    }
    return BOTTOM_GAP;
}