File: gui_at_sb.c

package info (click to toggle)
vim 1:7.1.314-3+lenny2
  • links: PTS, VCS
  • area: main
  • in suites: lenny
  • size: 39,856 kB
  • ctags: 25,430
  • sloc: ansic: 279,681; cpp: 3,229; makefile: 2,958; perl: 1,232; sh: 857; awk: 715; xml: 507; cs: 458; asm: 114; python: 28; csh: 6
file content (1213 lines) | stat: -rw-r--r-- 33,776 bytes parent folder | download | duplicates (2)
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
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
/* vi:set ts=8 sts=4 sw=4: */
/*
 * MODIFIED ATHENA SCROLLBAR (USING ARROWHEADS AT ENDS OF TRAVEL)
 * Modifications Copyright 1992 by Mitch Trachtenberg
 * Rights, permissions, and disclaimer of warranty are as in the DEC and MIT
 * notice below.
 * $XConsortium: Scrollbar.c,v 1.72 94/04/17 20:12:40 kaleb Exp $
 */

/*
 * Modified for Vim by Bill Foster and Bram Moolenaar
 */

/*

Copyright (c) 1987, 1988, 1994	X Consortium

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE X
CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the X Consortium shall not be
used in advertising or otherwise to promote the sale, use or other dealings in
this Software without prior written authorization from the X Consortium.

Copyright 1987, 1988 by Digital Equipment Corporation, Maynard, Massachusetts.

			All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted, provided that
the above copyright notice appear in all copies and that both that copyright
notice and this permission notice appear in supporting documentation, and that
the name of Digital not be used in advertising or publicity pertaining to
distribution of the software without specific, written prior permission.

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL DIGITAL
BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

*/

/* ScrollBar.c */
/* created by weissman, Mon Jul  7 13:20:03 1986 */
/* converted by swick, Thu Aug 27 1987 */

#include <X11/IntrinsicP.h>
#include <X11/StringDefs.h>

#include <X11/Xaw/XawInit.h>
#include "vim.h"
#include "gui_at_sb.h"

#include <X11/Xmu/Drawing.h>

/* Private definitions. */

static char defaultTranslations[] =
    "<Btn1Down>: NotifyScroll()\n\
     <Btn2Down>: MoveThumb() NotifyThumb()\n\
     <Btn3Down>: NotifyScroll()\n\
     <Btn4Down>: ScrollOneLineUp()\n\
     Shift<Btn4Down>: ScrollPageUp()\n\
     <Btn5Down>: ScrollOneLineDown()\n\
     Shift<Btn5Down>: ScrollPageDown()\n\
     <Btn1Motion>: HandleThumb()\n\
     <Btn3Motion>: HandleThumb()\n\
     <Btn2Motion>: MoveThumb() NotifyThumb()\n\
     <BtnUp>: EndScroll()";

static float floatZero = 0.0;

#define Offset(field) XtOffsetOf(ScrollbarRec, field)

static XtResource resources[] =
{
  {XtNlength, XtCLength, XtRDimension, sizeof(Dimension),
       Offset(scrollbar.length), XtRImmediate, (XtPointer) 1},
  {XtNthickness, XtCThickness, XtRDimension, sizeof(Dimension),
       Offset(scrollbar.thickness), XtRImmediate, (XtPointer) 14},
  {XtNorientation, XtCOrientation, XtROrientation, sizeof(XtOrientation),
      Offset(scrollbar.orientation), XtRImmediate, (XtPointer) XtorientVertical},
  {XtNscrollProc, XtCCallback, XtRCallback, sizeof(XtPointer),
       Offset(scrollbar.scrollProc), XtRCallback, NULL},
  {XtNthumbProc, XtCCallback, XtRCallback, sizeof(XtPointer),
       Offset(scrollbar.thumbProc), XtRCallback, NULL},
  {XtNjumpProc, XtCCallback, XtRCallback, sizeof(XtPointer),
       Offset(scrollbar.jumpProc), XtRCallback, NULL},
  {XtNthumb, XtCThumb, XtRBitmap, sizeof(Pixmap),
       Offset(scrollbar.thumb), XtRImmediate, (XtPointer) XtUnspecifiedPixmap},
  {XtNforeground, XtCForeground, XtRPixel, sizeof(Pixel),
       Offset(scrollbar.foreground), XtRString, XtDefaultForeground},
  {XtNshown, XtCShown, XtRFloat, sizeof(float),
       Offset(scrollbar.shown), XtRFloat, (XtPointer)&floatZero},
  {XtNtopOfThumb, XtCTopOfThumb, XtRFloat, sizeof(float),
       Offset(scrollbar.top), XtRFloat, (XtPointer)&floatZero},
  {XtNmaxOfThumb, XtCMaxOfThumb, XtRFloat, sizeof(float),
       Offset(scrollbar.max), XtRFloat, (XtPointer)&floatZero},
  {XtNminimumThumb, XtCMinimumThumb, XtRDimension, sizeof(Dimension),
       Offset(scrollbar.min_thumb), XtRImmediate, (XtPointer) 7},
  {XtNshadowWidth, XtCShadowWidth, XtRDimension, sizeof(Dimension),
       Offset(scrollbar.shadow_width), XtRImmediate, (XtPointer) 1},
  {XtNtopShadowPixel, XtCTopShadowPixel, XtRPixel, sizeof(Pixel),
       Offset(scrollbar.top_shadow_pixel), XtRString, XtDefaultBackground},
  {XtNbottomShadowPixel, XtCBottomShadowPixel, XtRPixel, sizeof(Pixel),
       Offset(scrollbar.bot_shadow_pixel), XtRString, XtDefaultForeground},
  {XtNlimitThumb, XtCLimitThumb, XtRBool, sizeof(Bool),
       Offset(scrollbar.limit_thumb), XtRImmediate, (XtPointer)0}
};
#undef Offset

static void ClassInitialize __ARGS((void));
static void Initialize __ARGS((Widget, Widget, ArgList, Cardinal *));
static void Destroy __ARGS((Widget));
static void Realize __ARGS((Widget, Mask *, XSetWindowAttributes *));
static void Resize __ARGS((Widget));
static void Redisplay __ARGS((Widget, XEvent *, Region));
static Boolean SetValues __ARGS((Widget, Widget, Widget, ArgList, Cardinal *));

static void HandleThumb __ARGS((Widget, XEvent *, String *, Cardinal *));
static void MoveThumb __ARGS((Widget, XEvent *, String *, Cardinal *));
static void NotifyThumb __ARGS((Widget, XEvent *, String *, Cardinal *));
static void NotifyScroll __ARGS((Widget, XEvent *, String *, Cardinal *));
static void EndScroll __ARGS((Widget, XEvent *, String *, Cardinal *));
static void ScrollOneLineUp __ARGS((Widget, XEvent *, String *, Cardinal *));
static void ScrollOneLineDown __ARGS((Widget, XEvent *, String *, Cardinal *));
static void ScrollPageUp __ARGS((Widget, XEvent *, String *, Cardinal *));
static void ScrollPageDown __ARGS((Widget, XEvent *, String *, Cardinal *));
static void ScrollSome __ARGS((Widget w, XEvent *event, int call_data));
static void _Xaw3dDrawShadows __ARGS((Widget, XEvent *, Region, int));
static void AllocTopShadowGC __ARGS((Widget));
static void AllocBotShadowGC __ARGS((Widget));

static XtActionsRec actions[] =
{
    {"HandleThumb",	HandleThumb},
    {"MoveThumb",	MoveThumb},
    {"NotifyThumb",	NotifyThumb},
    {"NotifyScroll",	NotifyScroll},
    {"EndScroll",	EndScroll},
    {"ScrollOneLineUp", ScrollOneLineUp},
    {"ScrollOneLineDown", ScrollOneLineDown},
    {"ScrollPageUp",	ScrollPageUp},
    {"ScrollPageDown",	ScrollPageDown}
};


ScrollbarClassRec vim_scrollbarClassRec =
{
  { /* core fields */
    /* superclass	*/  (WidgetClass) &simpleClassRec,
    /* class_name	*/  "Scrollbar",
    /* size		*/  sizeof(ScrollbarRec),
    /* class_initialize	*/  ClassInitialize,
    /* class_part_init	*/  NULL,
    /* class_inited	*/  FALSE,
    /* initialize	*/  Initialize,
    /* initialize_hook	*/  NULL,
    /* realize		*/  Realize,
    /* actions		*/  actions,
    /* num_actions	*/  XtNumber(actions),
    /* resources	*/  resources,
    /* num_resources	*/  XtNumber(resources),
    /* xrm_class	*/  NULLQUARK,
    /* compress_motion	*/  TRUE,
    /* compress_exposure*/  TRUE,
    /* compress_enterleave*/	TRUE,
    /* visible_interest */  FALSE,
    /* destroy		*/  Destroy,
    /* resize		*/  Resize,
    /* expose		*/  Redisplay,
    /* set_values	*/  SetValues,
    /* set_values_hook	*/  NULL,
    /* set_values_almost */ XtInheritSetValuesAlmost,
    /* get_values_hook	*/  NULL,
    /* accept_focus	*/  NULL,
    /* version		*/  XtVersion,
    /* callback_private */  NULL,
    /* tm_table		*/  defaultTranslations,
    /* query_geometry	*/  XtInheritQueryGeometry,
    /* display_accelerator*/	XtInheritDisplayAccelerator,
    /* extension	*/  NULL
  },
  { /* simple fields */
    /* change_sensitive	*/  XtInheritChangeSensitive
  },
  { /* scrollbar fields */
    /* ignore	    */	0
  }
};

WidgetClass vim_scrollbarWidgetClass = (WidgetClass)&vim_scrollbarClassRec;

#define NoButton -1
#define PICKLENGTH(widget, x, y) \
    ((widget->scrollbar.orientation == XtorientHorizontal) ? (x) : (y))
#define AT_MIN(x,y)    ((x) < (y) ? (x) : (y))
#define AT_MAX(x,y)    ((x) > (y) ? (x) : (y))

#define LINE_DELAY	300
#define PAGE_DELAY	300
#define LINE_REPEAT	 50
#define PAGE_REPEAT	250

    static void
ClassInitialize()
{
    XawInitializeWidgetSet();
    XtAddConverter( XtRString, XtROrientation, XmuCvtStringToOrientation,
	    (XtConvertArgList)NULL, (Cardinal)0 );
}

#define MARGIN(sbw) (sbw)->scrollbar.thickness + (sbw)->scrollbar.shadow_width

    static void
FillArea(sbw, top, bottom, fill, draw_shadow)
    ScrollbarWidget	sbw;
    Position		top, bottom;
    int			fill;
    int			draw_shadow;
{
    int tlen = bottom - top;	/* length of thumb in pixels */
    int sw, margin, floor;
    int lx, ly, lw, lh;

    if (bottom <= 0 || bottom <= top)
	return;
    if ((sw = sbw->scrollbar.shadow_width) < 0)
	sw = 0;
    margin = MARGIN (sbw);
    floor = sbw->scrollbar.length - margin + 2;

    if (sbw->scrollbar.orientation == XtorientHorizontal)
    {
	lx = ((top < margin) ? margin : top);
	ly = sw;
	lw = (((top + tlen) > floor) ? floor - top : tlen);
	lh = sbw->core.height - 2 * sw;
    }
    else
    {
	lx = sw;
	ly = ((top < margin) ? margin : top);
	lw = sbw->core.width - 2 * sw;
	lh = (((top + tlen) > floor) ? floor - top : tlen);
    }
    if (lh <= 0 || lw <= 0)
	return;

    if (draw_shadow)
    {
	if (!(sbw->scrollbar.orientation == XtorientHorizontal))
	{
	    /* Top border */
	    XDrawLine (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
		    sbw->scrollbar.top_shadow_GC,
		    lx, ly, lx + lw - 1, ly);

	    /* Bottom border */
	    XDrawLine (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
		    sbw->scrollbar.bot_shadow_GC,
		    lx, ly + lh - 1, lx + lw - 1, ly + lh - 1);
	}
	else
	{
	    /* Left border */
	    XDrawLine (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
		    sbw->scrollbar.top_shadow_GC,
		    lx, ly, lx, ly + lh - 1);

	    /* Right border */
	    XDrawLine (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
		    sbw->scrollbar.bot_shadow_GC,
		    lx + lw - 1, ly, lx + lw - 1, ly + lh - 1);
	}
	return;
    }

    if (fill)
    {
	XFillRectangle(XtDisplay((Widget) sbw), XtWindow((Widget) sbw),
		sbw->scrollbar.gc,
		lx, ly, (unsigned int) lw, (unsigned int) lh);

	if (!(sbw->scrollbar.orientation == XtorientHorizontal))
	{
	    /* Left border */
	    XDrawLine(XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
		    sbw->scrollbar.top_shadow_GC,
		    lx, ly, lx, ly + lh - 1);

	    /* Right border */
	    XDrawLine(XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
		    sbw->scrollbar.bot_shadow_GC,
		    lx + lw - 1, ly, lx + lw - 1, ly + lh - 1);
	}
	else
	{
	    /* Top border */
	    XDrawLine(XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
		    sbw->scrollbar.top_shadow_GC,
		    lx, ly, lx + lw - 1, ly);

	    /* Bottom border */
	    XDrawLine(XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
		    sbw->scrollbar.bot_shadow_GC,
		    lx, ly + lh - 1, lx + lw - 1, ly + lh - 1);
	}
    }
    else
    {
	XClearArea(XtDisplay((Widget) sbw), XtWindow((Widget) sbw),
		lx, ly, (unsigned int) lw, (unsigned int) lh, FALSE);
    }
}

/* Paint the thumb in the area specified by sbw->top and
   sbw->shown.	The old area is erased.  The painting and
   erasing is done cleverly so that no flickering will occur.
 */

    static void
PaintThumb(sbw)
    ScrollbarWidget sbw;
{
    Position	    oldtop, oldbot, newtop, newbot;
    Dimension	    margin, tzl;

    margin = MARGIN (sbw);
    tzl = sbw->scrollbar.length - 2 * margin;
    newtop = margin + (int)(tzl * sbw->scrollbar.top);
    newbot = newtop + (int)(tzl * sbw->scrollbar.shown) + 1;
    if (newbot < newtop + (int)sbw->scrollbar.min_thumb)
	newbot = newtop + sbw->scrollbar.min_thumb;

    oldtop = sbw->scrollbar.topLoc;
    oldbot = oldtop + sbw->scrollbar.shownLength;
    sbw->scrollbar.topLoc = newtop;
    sbw->scrollbar.shownLength = newbot - newtop;
    if (XtIsRealized ((Widget) sbw))
    {
	if (newtop < oldtop)
	    FillArea(sbw, newtop, AT_MIN(newbot,	oldtop+1),1,0);
	if (newtop > oldtop)
	    FillArea(sbw, oldtop, AT_MIN(newtop,	oldbot	),0,0);
	if (newbot < oldbot)
	    FillArea(sbw, AT_MAX(newbot, oldtop),	oldbot,   0,0);
	if (newbot > oldbot)
	    FillArea(sbw, AT_MAX(newtop, oldbot-1), newbot,  1,0);

	/* Only draw the missing shadows */
	FillArea(sbw, newtop, newbot, 0, 1);
    }
}

    static void
PaintArrows(sbw)
    ScrollbarWidget sbw;
{
    XPoint	point[6];
    Dimension	thickness = sbw->scrollbar.thickness - 1;
    Dimension	size;
    Dimension	off;

    if (XtIsRealized((Widget) sbw))
    {
	if ((int)thickness * 2 > (int)sbw->scrollbar.length)
	{
	    size = sbw->scrollbar.length / 2;
	    off = (int)(thickness - size) / 2;
	}
	else
	{
	    size = thickness;
	    off = 0;
	}
	point[0].x = off + sbw->scrollbar.shadow_width;
	point[0].y = size;
	point[1].x = thickness - off - sbw->scrollbar.shadow_width;
	point[1].y = size;
	point[2].x = thickness / 2;
	point[2].y = sbw->scrollbar.shadow_width;

	point[3].x = off + sbw->scrollbar.shadow_width;
	point[3].y = sbw->scrollbar.length - size;
	point[4].x = thickness - off - sbw->scrollbar.shadow_width;
	point[4].y = sbw->scrollbar.length - size;
	point[5].x = thickness / 2;
	point[5].y = sbw->scrollbar.length - sbw->scrollbar.shadow_width - 1;

	/* horizontal arrows require that x and y coordinates be swapped */
	if (sbw->scrollbar.orientation == XtorientHorizontal)
	{
	    int n;
	    int swap;
	    for (n = 0; n < 6; n++)
	    {
		swap = point[n].x;
		point[n].x = point[n].y;
		point[n].y = swap;
	    }
	}
	/* draw the up/left arrow */
	XFillPolygon (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
		sbw->scrollbar.gc,
		point, 3,
		Convex, CoordModeOrigin);
	XDrawLines (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
		sbw->scrollbar.bot_shadow_GC,
		point, 3,
		CoordModeOrigin);
	XDrawLine (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
		sbw->scrollbar.top_shadow_GC,
		point[0].x, point[0].y,
		point[2].x, point[2].y);
	/* draw the down/right arrow */
	XFillPolygon (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
		sbw->scrollbar.gc,
		point+3, 3,
		Convex, CoordModeOrigin);
	XDrawLine (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
		sbw->scrollbar.top_shadow_GC,
		point[3].x, point[3].y,
		point[4].x, point[4].y);
	XDrawLine (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
		sbw->scrollbar.top_shadow_GC,
		point[3].x, point[3].y,
		point[5].x, point[5].y);
	XDrawLine (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
		sbw->scrollbar.bot_shadow_GC,
		point[4].x, point[4].y,
		point[5].x, point[5].y);
    }
}

    static void
Destroy(w)
    Widget w;
{
    ScrollbarWidget sbw = (ScrollbarWidget) w;
    if (sbw->scrollbar.timer_id != (XtIntervalId) 0)
	XtRemoveTimeOut (sbw->scrollbar.timer_id);
    XtReleaseGC(w, sbw->scrollbar.gc);
    XtReleaseGC(w, sbw->scrollbar.top_shadow_GC);
    XtReleaseGC(w, sbw->scrollbar.bot_shadow_GC);
}

    static void
CreateGC(w)
    Widget w;
{
    ScrollbarWidget	sbw = (ScrollbarWidget) w;
    XGCValues		gcValues;
    XtGCMask		mask;
    unsigned int	depth = 1;

    if (sbw->scrollbar.thumb == XtUnspecifiedPixmap)
    {
	sbw->scrollbar.thumb = XmuCreateStippledPixmap (XtScreen(w),
		    (Pixel) 1, (Pixel) 0, depth);
    }
    else if (sbw->scrollbar.thumb != None)
    {
	Window		root;
	int		x, y;
	unsigned int	width, height, bw;

	if (XGetGeometry (XtDisplay(w), sbw->scrollbar.thumb, &root, &x, &y,
		&width, &height, &bw, &depth) == 0)
	    EMSG(_("Scrollbar Widget: Could not get geometry of thumb pixmap."));
    }

    gcValues.foreground = sbw->scrollbar.foreground;
    gcValues.background = sbw->core.background_pixel;
    mask = GCForeground | GCBackground;

    if (sbw->scrollbar.thumb != None)
    {
	gcValues.fill_style = FillSolid;
	mask |= GCFillStyle;
    }
    /* the creation should be non-caching, because */
    /* we now set and clear clip masks on the gc returned */
    sbw->scrollbar.gc = XtGetGC (w, mask, &gcValues);
}

    static void
SetDimensions(sbw)
    ScrollbarWidget sbw;
{
    if (sbw->scrollbar.orientation == XtorientVertical)
    {
	sbw->scrollbar.length = sbw->core.height;
	sbw->scrollbar.thickness = sbw->core.width;
    }
    else
    {
	sbw->scrollbar.length = sbw->core.width;
	sbw->scrollbar.thickness = sbw->core.height;
    }
}

/* ARGSUSED */
    static void
Initialize(request, new, args, num_args)
    Widget	request;	/* what the client asked for */
    Widget	new;		/* what we're going to give him */
    ArgList	args;
    Cardinal	*num_args;
{
    ScrollbarWidget sbw = (ScrollbarWidget) new;

    CreateGC(new);
    AllocTopShadowGC(new);
    AllocBotShadowGC(new);

    if (sbw->core.width == 0)
	sbw->core.width = (sbw->scrollbar.orientation == XtorientVertical)
	    ? sbw->scrollbar.thickness : sbw->scrollbar.length;

    if (sbw->core.height == 0)
	sbw->core.height = (sbw->scrollbar.orientation == XtorientHorizontal)
	    ? sbw->scrollbar.thickness : sbw->scrollbar.length;

    SetDimensions(sbw);
    sbw->scrollbar.scroll_mode = SMODE_NONE;
    sbw->scrollbar.timer_id = (XtIntervalId)0;
    sbw->scrollbar.topLoc = 0;
    sbw->scrollbar.shownLength = sbw->scrollbar.min_thumb;
}

    static void
Realize(w, valueMask, attributes)
    Widget w;
    Mask *valueMask;
    XSetWindowAttributes *attributes;
{
    /* The Simple widget actually stuffs the value in the valuemask. */
    (*vim_scrollbarWidgetClass->core_class.superclass->core_class.realize)
	(w, valueMask, attributes);
}

/* ARGSUSED */
    static Boolean
SetValues(current, request, desired, args, num_args)
    Widget  current,	    /* what I am */
	    request,	    /* what he wants me to be */
	    desired;	    /* what I will become */
    ArgList args;
    Cardinal *num_args;
{
    ScrollbarWidget	sbw = (ScrollbarWidget) current;
    ScrollbarWidget	dsbw = (ScrollbarWidget) desired;
    Boolean		redraw = FALSE;

/*
 * If these values are outside the acceptable range ignore them...
 */
    if (dsbw->scrollbar.top < 0.0 || dsbw->scrollbar.top > 1.0)
	dsbw->scrollbar.top = sbw->scrollbar.top;

    if (dsbw->scrollbar.shown < 0.0 || dsbw->scrollbar.shown > 1.0)
	dsbw->scrollbar.shown = sbw->scrollbar.shown;

/*
 * Change colors and stuff...
 */
    if (XtIsRealized(desired))
    {
	if (sbw->scrollbar.foreground != dsbw->scrollbar.foreground ||
		sbw->core.background_pixel != dsbw->core.background_pixel ||
		sbw->scrollbar.thumb != dsbw->scrollbar.thumb)
	{
	    XtReleaseGC(desired, sbw->scrollbar.gc);
	    CreateGC (desired);
	    redraw = TRUE;
	}
	if (sbw->scrollbar.top != dsbw->scrollbar.top ||
		sbw->scrollbar.shown != dsbw->scrollbar.shown)
	    redraw = TRUE;
    }
    return redraw;
}

    static void
Resize(w)
    Widget w;
{
    /* ForgetGravity has taken care of background, but thumb may
     * have to move as a result of the new size. */
    SetDimensions ((ScrollbarWidget) w);
    Redisplay(w, (XEvent*) NULL, (Region)NULL);
}


/* ARGSUSED */
    static void
Redisplay(w, event, region)
    Widget w;
    XEvent *event;
    Region region;
{
    ScrollbarWidget sbw = (ScrollbarWidget) w;
    int x, y;
    unsigned int width, height;

    _Xaw3dDrawShadows(w, event, region, FALSE);

    if (sbw->scrollbar.orientation == XtorientHorizontal)
    {
	x = sbw->scrollbar.topLoc;
	y = 1;
	width = sbw->scrollbar.shownLength;
	height = sbw->core.height - 2;
    }
    else
    {
	x = 1;
	y = sbw->scrollbar.topLoc;
	width = sbw->core.width - 2;
	height = sbw->scrollbar.shownLength;
    }
    if (region == NULL ||
	    XRectInRegion (region, x, y, width, height) != RectangleOut)
    {
	/* Forces entire thumb to be painted. */
	sbw->scrollbar.topLoc = -(sbw->scrollbar.length + 1);
	PaintThumb (sbw);
    }
    /* we'd like to be region aware here!!!! */
    PaintArrows(sbw);
}


    static Boolean
CompareEvents(oldEvent, newEvent)
    XEvent *oldEvent, *newEvent;
{
#define Check(field) if (newEvent->field != oldEvent->field) return False;

    Check(xany.display);
    Check(xany.type);
    Check(xany.window);

    switch (newEvent->type)
    {
	case MotionNotify:
	    Check(xmotion.state);
	    break;
	case ButtonPress:
	case ButtonRelease:
	    Check(xbutton.state);
	    Check(xbutton.button);
	    break;
	case KeyPress:
	case KeyRelease:
	    Check(xkey.state);
	    Check(xkey.keycode);
	    break;
	case EnterNotify:
	case LeaveNotify:
	    Check(xcrossing.mode);
	    Check(xcrossing.detail);
	    Check(xcrossing.state);
	    break;
    }
#undef Check

    return True;
}

struct EventData
{
    XEvent *oldEvent;
    int count;
};

    static Bool
PeekNotifyEvent(dpy, event, args)
    Display *dpy;
    XEvent *event;
    char *args;
{
    struct EventData *eventData = (struct EventData*)args;

    return ((++eventData->count == QLength(dpy)) /* since PeekIf blocks */
	|| CompareEvents(event, eventData->oldEvent));
}


    static Boolean
LookAhead(w, event)
    Widget w;
    XEvent *event;
{
    XEvent newEvent;
    struct EventData eventData;

    if (QLength (XtDisplay (w)) == 0)
	return False;

    eventData.count = 0;
    eventData.oldEvent = event;

    XPeekIfEvent (XtDisplay (w), &newEvent, PeekNotifyEvent, (char*)&eventData);

    return CompareEvents (event, &newEvent);
}


    static void
ExtractPosition(event, x, y, state)
    XEvent	    *event;
    Position	    *x, *y;	/* RETURN */
    unsigned int    *state;	/* RETURN */
{
    switch (event->type)
    {
	case MotionNotify:
	    *x = event->xmotion.x;
	    *y = event->xmotion.y;
	    if (state != NULL)
		*state = event->xmotion.state;
	    break;
	case ButtonPress:
	case ButtonRelease:
	    *x = event->xbutton.x;
	    *y = event->xbutton.y;
	    if (state != NULL)
		*state = event->xbutton.state;
	    break;
	case KeyPress:
	case KeyRelease:
	    *x = event->xkey.x;
	    *y = event->xkey.y;
	    if (state != NULL)
		*state = event->xkey.state;
	    break;
	case EnterNotify:
	case LeaveNotify:
	    *x = event->xcrossing.x;
	    *y = event->xcrossing.y;
	    if (state != NULL)
		*state = event->xcrossing.state;
	    break;
	default:
	    *x = 0; *y = 0;
	    if (state != NULL)
		*state = 0;
    }
}

    static void
HandleThumb(w, event, params, num_params)
    Widget w;
    XEvent *event;
    String *params;
    Cardinal *num_params;
{
    Position x, y, loc;
    ScrollbarWidget sbw = (ScrollbarWidget) w;

    ExtractPosition(event, &x, &y, (unsigned int *)NULL);
    loc = PICKLENGTH(sbw, x, y);
    /* if the motion event puts the pointer in thumb, call Move and Notify */
    /* also call Move and Notify if we're already in continuous scroll mode */
    if (sbw->scrollbar.scroll_mode == SMODE_CONT ||
	    (loc >= sbw->scrollbar.topLoc &&
	     loc <= sbw->scrollbar.topLoc + (int)sbw->scrollbar.shownLength))
    {
	XtCallActionProc(w, "MoveThumb", event, params, *num_params);
	XtCallActionProc(w, "NotifyThumb", event, params, *num_params);
    }
}

/* ARGSUSED */
    static void
RepeatNotify(client_data, idp)
    XtPointer client_data;
    XtIntervalId *idp;
{
    ScrollbarWidget sbw = (ScrollbarWidget) client_data;
    int		    call_data;
    char	    mode = sbw->scrollbar.scroll_mode;
    unsigned long   rep;

    if (mode == SMODE_NONE || mode == SMODE_CONT)
    {
	sbw->scrollbar.timer_id = (XtIntervalId)0;
	return;
    }

    if (mode == SMODE_LINE_DOWN || mode == SMODE_LINE_UP)
    {
	call_data = ONE_LINE_DATA;
	rep = LINE_REPEAT;
    }
    else
    {
	call_data = ONE_PAGE_DATA;
	rep = PAGE_REPEAT;
    }

    if (mode == SMODE_PAGE_UP || mode == SMODE_LINE_UP)
	call_data = -call_data;

    XtCallCallbacks((Widget)sbw, XtNscrollProc, (XtPointer)call_data);

    sbw->scrollbar.timer_id =
	XtAppAddTimeOut(XtWidgetToApplicationContext((Widget)sbw),
		rep,
		RepeatNotify,
		client_data);
}

/*
 * Same as above, but for floating numbers.
 */
    static float
FloatInRange(num, small, big)
    float num, small, big;
{
    return (num < small) ? small : ((num > big) ? big : num);
}

/* ARGSUSED */
    static void
ScrollOneLineUp(w, event, params, num_params)
    Widget	w;
    XEvent	*event;
    String	*params;
    Cardinal	*num_params;
{
    ScrollSome(w, event, -ONE_LINE_DATA);
}

/* ARGSUSED */
    static void
ScrollOneLineDown(w, event, params, num_params)
    Widget	w;
    XEvent	*event;
    String	*params;
    Cardinal	*num_params;
{
    ScrollSome(w, event, ONE_LINE_DATA);
}

/* ARGSUSED */
    static void
ScrollPageDown(w, event, params, num_params)
    Widget	w;
    XEvent	*event;
    String	*params;
    Cardinal	*num_params;
{
    ScrollSome(w, event, ONE_PAGE_DATA);
}

/* ARGSUSED */
    static void
ScrollPageUp(w, event, params, num_params)
    Widget	w;
    XEvent	*event;
    String	*params;
    Cardinal	*num_params;
{
    ScrollSome(w, event, -ONE_PAGE_DATA);
}

    static void
ScrollSome(w, event, call_data)
    Widget	w;
    XEvent	*event;
    int		call_data;
{
    ScrollbarWidget	sbw = (ScrollbarWidget) w;

    if (sbw->scrollbar.scroll_mode == SMODE_CONT)   /* if scroll continuous */
	return;

    if (LookAhead(w, event))
	return;

    sbw->scrollbar.scroll_mode = SMODE_LINE_UP;
    XtCallCallbacks(w, XtNscrollProc, (XtPointer)call_data);
}

/* ARGSUSED */
    static void
NotifyScroll(w, event, params, num_params)
    Widget	w;
    XEvent	*event;
    String	*params;
    Cardinal	*num_params;
{
    ScrollbarWidget sbw = (ScrollbarWidget) w;
    Position	    x, y, loc;
    Dimension	    arrow_size;
    unsigned long   delay = 0;
    int		    call_data = 0;
    unsigned int    state;

    if (sbw->scrollbar.scroll_mode == SMODE_CONT)   /* if scroll continuous */
	return;

    if (LookAhead (w, event))
	return;

    ExtractPosition(event, &x, &y, &state);
    loc = PICKLENGTH(sbw, x, y);

    if ((int)sbw->scrollbar.thickness * 2 > (int)sbw->scrollbar.length)
	arrow_size = sbw->scrollbar.length / 2;
    else
	arrow_size = sbw->scrollbar.thickness;

    /*
     * handle CTRL modifier
     */
    if (state & ControlMask)
    {
	if (loc > sbw->scrollbar.topLoc + (Position)sbw->scrollbar.shownLength)
	    call_data = END_PAGE_DATA;
	else
	    call_data = -END_PAGE_DATA;
	sbw->scrollbar.scroll_mode = SMODE_NONE;
    }
    /*
     * handle first arrow zone
     */
    else if (loc < (Position)arrow_size)
    {
	call_data = -ONE_LINE_DATA;
	sbw->scrollbar.scroll_mode = SMODE_LINE_UP;
	delay = LINE_DELAY;
    }

    /*
     * handle last arrow zone
     */
    else if (loc > (Position)(sbw->scrollbar.length - arrow_size))
    {
	call_data = ONE_LINE_DATA;
	sbw->scrollbar.scroll_mode = SMODE_LINE_DOWN;
	delay = LINE_DELAY;
    }

    /*
     * handle zone "above" the thumb
     */
    else if (loc < sbw->scrollbar.topLoc)
    {
	call_data = -ONE_PAGE_DATA;
	sbw->scrollbar.scroll_mode = SMODE_PAGE_UP;
	delay = PAGE_DELAY;
    }

    /*
     * handle zone "below" the thumb
     */
    else if (loc > sbw->scrollbar.topLoc + (Position)sbw->scrollbar.shownLength)
    {
	call_data = ONE_PAGE_DATA;
	sbw->scrollbar.scroll_mode = SMODE_PAGE_DOWN;
	delay = PAGE_DELAY;
    }

    if (call_data)
	XtCallCallbacks(w, XtNscrollProc, (XtPointer)call_data);

    /* establish autoscroll */
    if (delay)
	sbw->scrollbar.timer_id =
	    XtAppAddTimeOut(XtWidgetToApplicationContext(w),
					   delay, RepeatNotify, (XtPointer)w);
}

/* ARGSUSED */
    static void
EndScroll(w, event, params, num_params)
    Widget w;
    XEvent *event;	/* unused */
    String *params;	/* unused */
    Cardinal *num_params;   /* unused */
{
    ScrollbarWidget sbw = (ScrollbarWidget) w;

    sbw->scrollbar.scroll_mode = SMODE_NONE;
    /* no need to remove any autoscroll timeout; it will no-op */
    /* because the scroll_mode is SMODE_NONE */
    /* but be sure to remove timeout in destroy proc */
}

    static float
FractionLoc(sbw, x, y)
    ScrollbarWidget sbw;
    int x, y;
{
    int	    margin;
    float   height, width;

    margin = MARGIN(sbw);
    x -= margin;
    y -= margin;
    height = (float)sbw->core.height - 2 * margin;
    width = (float)sbw->core.width - 2 * margin;
    return PICKLENGTH(sbw, x / width, y / height);
}

/* ARGSUSED */
    static void
MoveThumb(w, event, params, num_params)
    Widget	w;
    XEvent	*event;
    String	*params;	/* unused */
    Cardinal	*num_params;	/* unused */
{
    ScrollbarWidget	sbw = (ScrollbarWidget)w;
    Position		x, y;
    float		top;
    char		old_mode = sbw->scrollbar.scroll_mode;

    sbw->scrollbar.scroll_mode = SMODE_CONT; /* indicate continuous scroll */

    if (LookAhead(w, event))
	return;

    if (!event->xmotion.same_screen)
	return;

    ExtractPosition(event, &x, &y, (unsigned int *)NULL);

    top = FractionLoc(sbw, x, y);

    if (old_mode != SMODE_CONT)		    /* start dragging: set offset */
    {
	if (event->xbutton.button == Button2)
	    sbw->scrollbar.scroll_off = sbw->scrollbar.shown / 2.;
	else
	    sbw->scrollbar.scroll_off = top - sbw->scrollbar.top;
    }

    top -= sbw->scrollbar.scroll_off;
    if (sbw->scrollbar.limit_thumb)
	top = FloatInRange(top, 0.0,
			sbw->scrollbar.max - sbw->scrollbar.shown + 0.000001);
    else
	top = FloatInRange(top, 0.0, sbw->scrollbar.max);

    sbw->scrollbar.top = top;
    PaintThumb(sbw);
    XFlush(XtDisplay(w));   /* re-draw it before Notifying */
}


/* ARGSUSED */
    static void
NotifyThumb(w, event, params, num_params)
    Widget	w;
    XEvent	*event;
    String	*params;	/* unused */
    Cardinal	*num_params;	/* unused */
{
    ScrollbarWidget sbw = (ScrollbarWidget)w;

    if (LookAhead(w, event))
	return;

    /* thumbProc is not pretty, but is necessary for backwards
       compatibility on those architectures for which it work{s,ed};
       the intent is to pass a (truncated) float by value. */
    XtCallCallbacks(w, XtNthumbProc, *(XtPointer*)&sbw->scrollbar.top);
    XtCallCallbacks(w, XtNjumpProc, (XtPointer)&sbw->scrollbar.top);
}

/* ARGSUSED */
    static void
AllocTopShadowGC(w)
    Widget w;
{
    ScrollbarWidget sbw = (ScrollbarWidget) w;
    XtGCMask	    valuemask;
    XGCValues	    myXGCV;

    valuemask = GCForeground;
    myXGCV.foreground = sbw->scrollbar.top_shadow_pixel;
    sbw->scrollbar.top_shadow_GC = XtGetGC(w, valuemask, &myXGCV);
}

/* ARGSUSED */
    static void
AllocBotShadowGC(w)
    Widget w;
{
    ScrollbarWidget sbw = (ScrollbarWidget) w;
    XtGCMask	    valuemask;
    XGCValues	    myXGCV;

    valuemask = GCForeground;
    myXGCV.foreground = sbw->scrollbar.bot_shadow_pixel;
    sbw->scrollbar.bot_shadow_GC = XtGetGC(w, valuemask, &myXGCV);
}

/* ARGSUSED */
    static void
_Xaw3dDrawShadows(gw, event, region, out)
    Widget  gw;
    XEvent  *event;
    Region  region;
    int	    out;
{
    XPoint  pt[6];
    ScrollbarWidget sbw = (ScrollbarWidget) gw;
    Dimension	s = sbw->scrollbar.shadow_width;
    /*
     * draw the shadows using the core part width and height,
     * and the scrollbar part shadow_width.
     *
     *	no point to do anything if the shadow_width is 0 or the
     *	widget has not been realized.
     */
    if (s > 0 && XtIsRealized(gw))
    {
	Dimension   h = sbw->core.height;
	Dimension   w = sbw->core.width;
	Dimension   wms = w - s;
	Dimension   hms = h - s;
	Display	    *dpy = XtDisplay (gw);
	Window	    win = XtWindow (gw);
	GC	top, bot;

	if (out)
	{
	    top = sbw->scrollbar.top_shadow_GC;
	    bot = sbw->scrollbar.bot_shadow_GC;
	}
	else
	{
	    top = sbw->scrollbar.bot_shadow_GC;
	    bot = sbw->scrollbar.top_shadow_GC;
	}

	/* top-left shadow */
	if ((region == NULL) ||
		(XRectInRegion (region, 0, 0, w, s) != RectangleOut) ||
		(XRectInRegion (region, 0, 0, s, h) != RectangleOut))
	{
	    pt[0].x = 0;    pt[0].y = h;
	    pt[1].x =	    pt[1].y = 0;
	    pt[2].x = w;    pt[2].y = 0;
	    pt[3].x = wms;  pt[3].y = s;
	    pt[4].x =	    pt[4].y = s;
	    pt[5].x = s;    pt[5].y = hms;
	    XFillPolygon (dpy, win, top, pt, 6, Complex, CoordModeOrigin);
	}

	/* bottom-right shadow */
	if ((region == NULL) ||
		(XRectInRegion (region, 0, hms, w, s) != RectangleOut) ||
		(XRectInRegion (region, wms, 0, s, h) != RectangleOut))
	{
	    pt[0].x = 0;    pt[0].y = h;
	    pt[1].x = w;    pt[1].y = h;
	    pt[2].x = w;    pt[2].y = 0;
	    pt[3].x = wms;  pt[3].y = s;
	    pt[4].x = wms;  pt[4].y = hms;
	    pt[5].x = s;    pt[5].y = hms;
	    XFillPolygon (dpy, win, bot, pt, 6, Complex, CoordModeOrigin);
	}
    }
}


/*
 * Set the scroll bar to the given location.
 */
    void
vim_XawScrollbarSetThumb(w, top, shown, max)
    Widget w;
    double top, shown, max;
{
    ScrollbarWidget sbw = (ScrollbarWidget) w;

    if (sbw->scrollbar.scroll_mode == SMODE_CONT) /* if still thumbing */
	return;

    sbw->scrollbar.max = (max > 1.0) ? 1.0 :
		(max >= 0.0) ? max : sbw->scrollbar.max;

    sbw->scrollbar.top = (top > sbw->scrollbar.max) ? sbw->scrollbar.max :
		(top >= 0.0) ? top : sbw->scrollbar.top;

    sbw->scrollbar.shown = (shown > 1.0) ? 1.0 :
		(shown >= 0.0) ? shown : sbw->scrollbar.shown;

    PaintThumb(sbw);
}