summaryrefslogtreecommitdiff
path: root/src/widget.cpp
blob: cd0c68adf7a68493efc8909fcb0ae256eca9aa4b (plain)
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
/* $Id$ */

/** @file widget.cpp */

#include "stdafx.h"
#include "openttd.h"
#include "functions.h"
#include "player.h"
#include "table/sprites.h"
#include "table/strings.h"
#include "window.h"
#include "gfx.h"
#include "viewport.h"

static Point HandleScrollbarHittest(const Scrollbar *sb, int top, int bottom)
{
	Point pt;
	int height, count, pos, cap;

	top += 10;
	bottom -= 9;

	height = (bottom - top);

	pos = sb->pos;
	count = sb->count;
	cap = sb->cap;

	if (count != 0) top += height * pos / count;

	if (cap > count) cap = count;
	if (count != 0) bottom -= (count - pos - cap) * height / count;

	pt.x = top;
	pt.y = bottom - 1;
	return pt;
}

/** Special handling for the scrollbar widget type.
 * Handles the special scrolling buttons and other
 * scrolling.
 * @param w Window on which a scroll was performed.
 * @param wi Pointer to the scrollbar widget.
 * @param x The X coordinate of the mouse click.
 * @param y The Y coordinate of the mouse click. */
void ScrollbarClickHandler(Window *w, const Widget *wi, int x, int y)
{
	int mi, ma, pos;
	Scrollbar *sb;

	switch (wi->type) {
		case WWT_SCROLLBAR: {
			/* vertical scroller */
			w->flags4 &= ~WF_HSCROLL;
			w->flags4 &= ~WF_SCROLL2;
			mi = wi->top;
			ma = wi->bottom;
			pos = y;
			sb = &w->vscroll;
			break;
		}
		case WWT_SCROLL2BAR: {
			/* 2nd vertical scroller */
			w->flags4 &= ~WF_HSCROLL;
			w->flags4 |= WF_SCROLL2;
			mi = wi->top;
			ma = wi->bottom;
			pos = y;
			sb = &w->vscroll2;
			break;
		}
		case  WWT_HSCROLLBAR: {
			/* horizontal scroller */
			w->flags4 &= ~WF_SCROLL2;
			w->flags4 |= WF_HSCROLL;
			mi = wi->left;
			ma = wi->right;
			pos = x;
			sb = &w->hscroll;
			break;
		}
		default: return; //this should never happen
	}
	if (pos <= mi+9) {
		/* Pressing the upper button? */
		w->flags4 |= WF_SCROLL_UP;
		if (_scroller_click_timeout == 0) {
			_scroller_click_timeout = 6;
			if (sb->pos != 0) sb->pos--;
		}
		_left_button_clicked = false;
	} else if (pos >= ma-10) {
		/* Pressing the lower button? */
		w->flags4 |= WF_SCROLL_DOWN;

		if (_scroller_click_timeout == 0) {
			_scroller_click_timeout = 6;
			if ((byte)(sb->pos + sb->cap) < sb->count)
				sb->pos++;
		}
		_left_button_clicked = false;
	} else {
		Point pt = HandleScrollbarHittest(sb, mi, ma);

		if (pos < pt.x) {
			sb->pos = max(sb->pos - sb->cap, 0);
		} else if (pos > pt.y) {
			sb->pos = min(
				sb->pos + sb->cap,
				max(sb->count - sb->cap, 0)
			);
		} else {
			_scrollbar_start_pos = pt.x - mi - 9;
			_scrollbar_size = ma - mi - 23;
			w->flags4 |= WF_SCROLL_MIDDLE;
			_scrolling_scrollbar = true;
			_cursorpos_drag_start = _cursor.pos;
		}
	}

	SetWindowDirty(w);
}

/** Returns the index for the widget located at the given position
 * relative to the window. It includes all widget-corner pixels as well.
 * @param *w Window to look inside
 * @param  x The Window client X coordinate
 * @param  y The Window client y coordinate
 * @return A widget index, or -1 if no widget was found.
 */
int GetWidgetFromPos(const Window *w, int x, int y)
{
	uint index;
	int found_index = -1;

	/* Go through the widgets and check if we find the widget that the coordinate is
	 * inside. */
	for (index = 0; index < w->widget_count; index++) {
		const Widget *wi = &w->widget[index];
		if (wi->type == WWT_EMPTY || wi->type == WWT_FRAME) continue;

		if (x >= wi->left && x <= wi->right && y >= wi->top &&  y <= wi->bottom &&
				!IsWindowWidgetHidden(w, index)) {
			found_index = index;
		}
	}

	return found_index;
}


void DrawFrameRect(int left, int top, int right, int bottom, int ctab, FrameFlags flags)
{
	uint dark         = _colour_gradient[ctab][3];
	uint medium_dark  = _colour_gradient[ctab][5];
	uint medium_light = _colour_gradient[ctab][6];
	uint light        = _colour_gradient[ctab][7];

	if (flags & FR_TRANSPARENT) {
		GfxFillRect(left, top, right, bottom, PALETTE_TO_TRANSPARENT | (1 << USE_COLORTABLE));
	} else {
		uint interior;

		if (flags & FR_LOWERED) {
			GfxFillRect(left,     top,     left,  bottom,     dark);
			GfxFillRect(left + 1, top,     right, top,        dark);
			GfxFillRect(right,    top + 1, right, bottom - 1, light);
			GfxFillRect(left + 1, bottom,  right, bottom,     light);
			interior = (flags & FR_DARKENED ? medium_dark : medium_light);
		} else {
			GfxFillRect(left,     top,    left,      bottom - 1, light);
			GfxFillRect(left + 1, top,    right - 1, top,        light);
			GfxFillRect(right,    top,    right,     bottom - 1, dark);
			GfxFillRect(left,     bottom, right,     bottom,     dark);
			interior = medium_dark;
		}
		if (!(flags & FR_BORDERONLY)) {
			GfxFillRect(left + 1, top + 1, right - 1, bottom - 1, interior);
		}
	}
}


void DrawWindowWidgets(const Window *w)
{
	const DrawPixelInfo* dpi = _cur_dpi;
	Rect r;
	uint i;

	for (i = 0; i < w->widget_count; i++) {
		const Widget *wi = &w->widget[i];
		bool clicked = IsWindowWidgetLowered(w, i);

		if (dpi->left > (r.right=/*w->left + */wi->right) ||
				dpi->left + dpi->width <= (r.left=wi->left/* + w->left*/) ||
				dpi->top > (r.bottom=/*w->top +*/ wi->bottom) ||
				dpi->top + dpi->height <= (r.top = /*w->top +*/ wi->top) ||
				IsWindowWidgetHidden(w, i)) {
			continue;
		}

		switch (wi->type & WWT_MASK) {
		case WWT_IMGBTN:
		case WWT_IMGBTN_2: {
			int img = wi->data;
			assert(img != 0);
			DrawFrameRect(r.left, r.top, r.right, r.bottom, wi->color, (clicked) ? FR_LOWERED : FR_NONE);

			/* show different image when clicked for WWT_IMGBTN_2 */
			if ((wi->type & WWT_MASK) == WWT_IMGBTN_2 && clicked) img++;
			DrawSprite(img, PAL_NONE, r.left + 1 + clicked, r.top + 1 + clicked);
			goto draw_default;
		}

		case WWT_PANEL: {
			assert(wi->data == 0);
			DrawFrameRect(r.left, r.top, r.right, r.bottom, wi->color, (clicked) ? FR_LOWERED : FR_NONE);
			goto draw_default;
		}

		case WWT_TEXTBTN:
		case WWT_TEXTBTN_2: {
			DrawFrameRect(r.left, r.top, r.right, r.bottom, wi->color, (clicked) ? FR_LOWERED : FR_NONE);
			}
		/* fall through */

		case WWT_LABEL: {
			StringID str = wi->data;

			if ((wi->type & WWT_MASK) == WWT_TEXTBTN_2 && clicked) str++;

			DrawStringCentered(((r.left + r.right + 1) >> 1) + clicked, ((r.top + r.bottom + 1) >> 1) - 5 + clicked, str, 0);
			goto draw_default;
		}

		case WWT_TEXT: {
			StringID str = wi->data;

			if (str != STR_NULL) DrawStringTruncated(r.left, r.top, str, wi->color, r.right - r.left);
			break;
		}

		case WWT_INSET: {
			StringID str = wi->data;
			DrawFrameRect(r.left, r.top, r.right, r.bottom, wi->color, FR_LOWERED | FR_DARKENED);

			if (str != STR_NULL) DrawStringTruncated(r.left + 2, r.top + 1, str, 0, r.right - r.left - 10);
			goto draw_default;
		}

		case WWT_MATRIX: {
			int c, d, ctr;
			int x, amt1, amt2;
			int color;

			DrawFrameRect(r.left, r.top, r.right, r.bottom, wi->color, (clicked) ? FR_LOWERED : FR_NONE);

			c = GB(wi->data, 0, 8);
			amt1 = (wi->right - wi->left + 1) / c;

			d = GB(wi->data, 8, 8);
			amt2 = (wi->bottom - wi->top + 1) / d;

			color = _colour_gradient[wi->color & 0xF][6];

			x = r.left;
			for (ctr = c; ctr > 1; ctr--) {
				x += amt1;
				GfxFillRect(x, r.top + 1, x, r.bottom - 1, color);
			}

			x = r.top;
			for (ctr = d; ctr > 1; ctr--) {
				x += amt2;
				GfxFillRect(r.left + 1, x, r.right - 1, x, color);
			}

			color = _colour_gradient[wi->color&0xF][4];

			x = r.left - 1;
			for (ctr = c; ctr > 1; ctr--) {
				x += amt1;
				GfxFillRect(x, r.top + 1, x, r.bottom - 1, color);
			}

			x = r.top - 1;
			for (ctr = d; ctr > 1; ctr--) {
				x += amt2;
				GfxFillRect(r.left+1, x, r.right-1, x, color);
			}

			goto draw_default;
		}

		/* vertical scrollbar */
		case WWT_SCROLLBAR: {
			Point pt;
			int c1,c2;

			assert(r.right - r.left == 11); // XXX - to ensure the same sizes are used everywhere!

			/* draw up/down buttons */
			clicked = ((w->flags4 & (WF_SCROLL_UP | WF_HSCROLL | WF_SCROLL2)) == WF_SCROLL_UP);
			DrawFrameRect(r.left, r.top, r.right, r.top + 9, wi->color, (clicked) ? FR_LOWERED : FR_NONE);
			DoDrawString(UPARROW, r.left + 2 + clicked, r.top + clicked, 0x10);

			clicked = (((w->flags4 & (WF_SCROLL_DOWN | WF_HSCROLL | WF_SCROLL2)) == WF_SCROLL_DOWN));
			DrawFrameRect(r.left, r.bottom - 9, r.right, r.bottom, wi->color, (clicked) ? FR_LOWERED : FR_NONE);
			DoDrawString(DOWNARROW, r.left + 2 + clicked, r.bottom - 9 + clicked, 0x10);

			c1 = _colour_gradient[wi->color&0xF][3];
			c2 = _colour_gradient[wi->color&0xF][7];

			/* draw "shaded" background */
			GfxFillRect(r.left, r.top+10, r.right, r.bottom-10, c2);
			GfxFillRect(r.left, r.top+10, r.right, r.bottom-10, c1 | (1 << PALETTE_MODIFIER_GREYOUT));

			/* draw shaded lines */
			GfxFillRect(r.left+2, r.top+10, r.left+2, r.bottom-10, c1);
			GfxFillRect(r.left+3, r.top+10, r.left+3, r.bottom-10, c2);
			GfxFillRect(r.left+7, r.top+10, r.left+7, r.bottom-10, c1);
			GfxFillRect(r.left+8, r.top+10, r.left+8, r.bottom-10, c2);

			pt = HandleScrollbarHittest(&w->vscroll, r.top, r.bottom);
			DrawFrameRect(r.left, pt.x, r.right, pt.y, wi->color, (w->flags4 & (WF_SCROLL_MIDDLE | WF_HSCROLL | WF_SCROLL2)) == WF_SCROLL_MIDDLE ? FR_LOWERED : FR_NONE);
			break;
		}
		case WWT_SCROLL2BAR: {
			Point pt;
			int c1,c2;

			assert(r.right - r.left == 11); // XXX - to ensure the same sizes are used everywhere!

			/* draw up/down buttons */
			clicked = ((w->flags4 & (WF_SCROLL_UP | WF_HSCROLL | WF_SCROLL2)) == (WF_SCROLL_UP | WF_SCROLL2));
			DrawFrameRect(r.left, r.top, r.right, r.top + 9, wi->color,  (clicked) ? FR_LOWERED : FR_NONE);
			DoDrawString(UPARROW, r.left + 2 + clicked, r.top + clicked, 0x10);

			clicked = ((w->flags4 & (WF_SCROLL_DOWN | WF_HSCROLL | WF_SCROLL2)) == (WF_SCROLL_DOWN | WF_SCROLL2));
			DrawFrameRect(r.left, r.bottom - 9, r.right, r.bottom, wi->color,  (clicked) ? FR_LOWERED : FR_NONE);
			DoDrawString(DOWNARROW, r.left + 2 + clicked, r.bottom - 9 + clicked, 0x10);

			c1 = _colour_gradient[wi->color&0xF][3];
			c2 = _colour_gradient[wi->color&0xF][7];

			/* draw "shaded" background */
			GfxFillRect(r.left, r.top+10, r.right, r.bottom-10, c2);
			GfxFillRect(r.left, r.top+10, r.right, r.bottom-10, c1 | (1 << PALETTE_MODIFIER_GREYOUT));

			/* draw shaded lines */
			GfxFillRect(r.left+2, r.top+10, r.left+2, r.bottom-10, c1);
			GfxFillRect(r.left+3, r.top+10, r.left+3, r.bottom-10, c2);
			GfxFillRect(r.left+7, r.top+10, r.left+7, r.bottom-10, c1);
			GfxFillRect(r.left+8, r.top+10, r.left+8, r.bottom-10, c2);

			pt = HandleScrollbarHittest(&w->vscroll2, r.top, r.bottom);
			DrawFrameRect(r.left, pt.x, r.right, pt.y, wi->color, (w->flags4 & (WF_SCROLL_MIDDLE | WF_HSCROLL | WF_SCROLL2)) == (WF_SCROLL_MIDDLE | WF_SCROLL2) ? FR_LOWERED : FR_NONE);
			break;
		}

		/* horizontal scrollbar */
		case WWT_HSCROLLBAR: {
			Point pt;
			int c1,c2;

			assert(r.bottom - r.top == 11); // XXX - to ensure the same sizes are used everywhere!

			clicked = ((w->flags4 & (WF_SCROLL_UP | WF_HSCROLL)) == (WF_SCROLL_UP | WF_HSCROLL));
			DrawFrameRect(r.left, r.top, r.left + 9, r.bottom, wi->color, (clicked) ? FR_LOWERED : FR_NONE);
			DrawSprite(SPR_ARROW_LEFT, PAL_NONE, r.left + 1 + clicked, r.top + 1 + clicked);

			clicked = ((w->flags4 & (WF_SCROLL_DOWN | WF_HSCROLL)) == (WF_SCROLL_DOWN | WF_HSCROLL));
			DrawFrameRect(r.right-9, r.top, r.right, r.bottom, wi->color, (clicked) ? FR_LOWERED : FR_NONE);
			DrawSprite(SPR_ARROW_RIGHT, PAL_NONE, r.right - 8 + clicked, r.top + 1 + clicked);

			c1 = _colour_gradient[wi->color&0xF][3];
			c2 = _colour_gradient[wi->color&0xF][7];

			/* draw "shaded" background */
			GfxFillRect(r.left+10, r.top, r.right-10, r.bottom, c2);
			GfxFillRect(r.left+10, r.top, r.right-10, r.bottom, c1 | (1 << PALETTE_MODIFIER_GREYOUT));

			/* draw shaded lines */
			GfxFillRect(r.left+10, r.top+2, r.right-10, r.top+2, c1);
			GfxFillRect(r.left+10, r.top+3, r.right-10, r.top+3, c2);
			GfxFillRect(r.left+10, r.top+7, r.right-10, r.top+7, c1);
			GfxFillRect(r.left+10, r.top+8, r.right-10, r.top+8, c2);

			/* draw actual scrollbar */
			pt = HandleScrollbarHittest(&w->hscroll, r.left, r.right);
			DrawFrameRect(pt.x, r.top, pt.y, r.bottom, wi->color, (w->flags4 & (WF_SCROLL_MIDDLE | WF_HSCROLL)) == (WF_SCROLL_MIDDLE | WF_HSCROLL) ? FR_LOWERED : FR_NONE);

			break;
		}

		case WWT_FRAME: {
			int c1,c2;
			int x2 = r.left; // by default the left side is the left side of the widget

			if (wi->data != 0) x2 = DrawString(r.left + 6, r.top, wi->data, 0);

			c1 = _colour_gradient[wi->color][3];
			c2 = _colour_gradient[wi->color][7];

			/*Line from upper left corner to start of text */
			GfxFillRect(r.left, r.top+4, r.left+4,r.top+4, c1);
			GfxFillRect(r.left+1, r.top+5, r.left+4,r.top+5, c2);

			/* Line from end of text to upper right corner */
			GfxFillRect(x2, r.top+4, r.right-1,r.top+4,c1);
			GfxFillRect(x2, r.top+5, r.right-2,r.top+5,c2);

			/* Line from upper left corner to bottom left corner */
			GfxFillRect(r.left, r.top+5, r.left, r.bottom-1, c1);
			GfxFillRect(r.left+1, r.top+6, r.left+1, r.bottom-2, c2);

			/*Line from upper right corner to bottom right corner */
			GfxFillRect(r.right-1, r.top+5, r.right-1, r.bottom-2, c1);
			GfxFillRect(r.right, r.top+4, r.right, r.bottom-1, c2);

			GfxFillRect(r.left+1, r.bottom-1, r.right-1, r.bottom-1, c1);
			GfxFillRect(r.left, r.bottom, r.right, r.bottom, c2);

			goto draw_default;
		}

		case WWT_STICKYBOX: {
			assert(r.right - r.left == 11); // XXX - to ensure the same sizes are used everywhere!

			clicked = !!(w->flags4 & WF_STICKY);
			DrawFrameRect(r.left, r.top, r.right, r.bottom, wi->color, (clicked) ? FR_LOWERED : FR_NONE);
			DrawSprite((clicked) ? SPR_PIN_UP : SPR_PIN_DOWN, PAL_NONE, r.left + 2 + clicked, r.top + 3 + clicked);
			break;
		}

		case WWT_RESIZEBOX: {
			assert(r.right - r.left == 11); // XXX - to ensure the same sizes are used everywhere!

			clicked = !!(w->flags4 & WF_SIZING);
			DrawFrameRect(r.left, r.top, r.right, r.bottom, wi->color, (clicked) ? FR_LOWERED : FR_NONE);
			DrawSprite(SPR_WINDOW_RESIZE, PAL_NONE, r.left + 3 + clicked, r.top + 3 + clicked);
			break;
		}

		case WWT_CLOSEBOX: {
			assert(r.right - r.left == 10); // ensure the same sizes are used everywhere

			DrawFrameRect(r.left, r.top, r.right, r.bottom, wi->color, FR_NONE);
			DrawString(r.left + 2, r.top + 2, STR_00C5, 0);
			break;
		}

		case WWT_CAPTION: {
			assert(r.bottom - r.top == 13); // XXX - to ensure the same sizes are used everywhere!
			DrawFrameRect(r.left, r.top, r.right, r.bottom, wi->color, FR_BORDERONLY);
			DrawFrameRect(r.left+1, r.top+1, r.right-1, r.bottom-1, wi->color, (w->caption_color == 0xFF) ? FR_LOWERED | FR_DARKENED : FR_LOWERED | FR_DARKENED | FR_BORDERONLY);

			if (w->caption_color != 0xFF) {
				GfxFillRect(r.left+2, r.top+2, r.right-2, r.bottom-2, _colour_gradient[_player_colors[w->caption_color]][4]);
			}

			DrawStringCenteredTruncated(r.left + 2, r.right - 2, r.top+2, wi->data, 0x84);
draw_default:;
			if (IsWindowWidgetDisabled(w, i)) {
				GfxFillRect(r.left+1, r.top+1, r.right-1, r.bottom-1, _colour_gradient[wi->color&0xF][2] | (1 << PALETTE_MODIFIER_GREYOUT));
			}
		}
		}
	}


	if (w->flags4 & WF_WHITE_BORDER_MASK) {
		//DrawFrameRect(w->left, w->top, w->left + w->width-1, w->top+w->height-1, 0xF, 0x10);
		DrawFrameRect(0, 0, w->width-1, w->height-1, 0xF, FR_BORDERONLY);
	}

}

static const Widget _dropdown_menu_widgets[] = {
{      WWT_PANEL,   RESIZE_NONE,     0,     0, 0,     0, 0, 0x0, STR_NULL},
{  WWT_SCROLLBAR,   RESIZE_NONE,     0,     0, 0,     0, 0, 0x0, STR_0190_SCROLL_BAR_SCROLLS_LIST},
{   WIDGETS_END},
};

static int GetDropdownItem(const Window *w)
{
	byte item, counter;
	int y;

	if (GetWidgetFromPos(w, _cursor.pos.x - w->left, _cursor.pos.y - w->top) < 0)
		return -1;

	y = _cursor.pos.y - w->top - 2 + w->vscroll.pos * 10;

	if (y < 0)
		return - 1;

	item = y / 10;
	if (item >= WP(w,dropdown_d).num_items || (HASBIT(WP(w,dropdown_d).disabled_state, item) && !HASBIT(WP(w,dropdown_d).hidden_state, item)) || WP(w,dropdown_d).items[item] == 0)
		return - 1;

	/* Skip hidden items -- +1 for each hidden item before the clicked item. */
	for (counter = 0; item >= counter; ++counter)
		if (HASBIT(WP(w,dropdown_d).hidden_state, counter)) item++;

	return item;
}

static void DropdownMenuWndProc(Window *w, WindowEvent *e)
{
	int item;

	switch (e->event) {
		case WE_PAINT: {
			int x,y,i,sel;
			int width, height;

			DrawWindowWidgets(w);

			x = 1;
			y = 2 - w->vscroll.pos * 10;

			sel    = WP(w,dropdown_d).selected_index;
			width  = w->widget[0].right - 3;
			height = w->widget[0].bottom - 3;

			for (i = 0; WP(w,dropdown_d).items[i] != INVALID_STRING_ID; i++, sel--) {
				if (HASBIT(WP(w,dropdown_d).hidden_state, i)) continue;

				if (y >= 0 && y <= height) {
					if (WP(w,dropdown_d).items[i] != STR_NULL) {
						if (sel == 0) GfxFillRect(x + 1, y, x + width, y + 9, 0);
						DrawStringTruncated(x + 2, y, WP(w,dropdown_d).items[i], sel == 0 ? 12 : 16, x + width);

						if (HASBIT(WP(w,dropdown_d).disabled_state, i)) {
							GfxFillRect(x, y, x + width, y + 9,
								(1 << PALETTE_MODIFIER_GREYOUT) | _colour_gradient[_dropdown_menu_widgets[0].color][5]
							);
						}
					} else {
						int c1 = _colour_gradient[_dropdown_menu_widgets[0].color][3];
						int c2 = _colour_gradient[_dropdown_menu_widgets[0].color][7];

						GfxFillRect(x + 1, y + 3, x + w->width - 5, y + 3, c1);
						GfxFillRect(x + 1, y + 4, x + w->width - 5, y + 4, c2);
					}
				}
				y += 10;
			}
		} break;

		case WE_CLICK: {
			if (e->we.click.widget != 0) break;
			item = GetDropdownItem(w);
			if (item >= 0) {
				WP(w,dropdown_d).click_delay = 4;
				WP(w,dropdown_d).selected_index = item;
				SetWindowDirty(w);
			}
		} break;

		case WE_MOUSELOOP: {
			Window *w2 = FindWindowById(WP(w,dropdown_d).parent_wnd_class, WP(w,dropdown_d).parent_wnd_num);
			if (w2 == NULL) {
				DeleteWindow(w);
				return;
			}

			if (WP(w,dropdown_d).click_delay != 0 && --WP(w,dropdown_d).click_delay == 0) {
				WindowEvent e;
				e.event = WE_DROPDOWN_SELECT;
				e.we.dropdown.button = WP(w,dropdown_d).parent_button;
				e.we.dropdown.index  = WP(w,dropdown_d).selected_index;
				w2->wndproc(w2, &e);
				DeleteWindow(w);
				return;
			}

			if (WP(w,dropdown_d).drag_mode) {
				item = GetDropdownItem(w);

				if (!_left_button_clicked) {
					WP(w,dropdown_d).drag_mode = false;
					if (item < 0) return;
					WP(w,dropdown_d).click_delay = 2;
				} else {
					if (item < 0) return;
				}

				WP(w,dropdown_d).selected_index = item;
				SetWindowDirty(w);
			}
		} break;

		case WE_DESTROY: {
			Window *w2 = FindWindowById(WP(w,dropdown_d).parent_wnd_class, WP(w,dropdown_d).parent_wnd_num);
			if (w2 != NULL) {
				RaiseWindowWidget(w2, WP(w,dropdown_d).parent_button);
				InvalidateWidget(w2, WP(w,dropdown_d).parent_button);
			}
		} break;
	}
}

void ShowDropDownMenu(Window *w, const StringID *strings, int selected, int button, uint32 disabled_mask, uint32 hidden_mask)
{
	int i;
	const Widget *wi;
	Window *w2;
	const Window *w3;
	bool is_dropdown_menu_shown = IsWindowWidgetLowered(w, button);
	int top, height;
	int screen_top, screen_bottom;
	bool scroll = false;

	DeleteWindowById(WC_DROPDOWN_MENU, 0);

	if (is_dropdown_menu_shown) return;

	LowerWindowWidget(w, button);

	InvalidateWidget(w, button);

	for (i = 0; strings[i] != INVALID_STRING_ID; i++) {}
	if (i == 0) return;

	wi = &w->widget[button];

	if (hidden_mask != 0) {
		uint j;

		for (j = 0; strings[j] != INVALID_STRING_ID; j++) {
			if (HASBIT(hidden_mask, j)) i--;
		}
	}

	/* The preferred position is just below the dropdown calling widget */
	top = w->top + wi->bottom + 2;
	height = i * 10 + 4;

	w3 = FindWindowById(WC_STATUS_BAR, 0);
	screen_bottom = w3 == NULL ? _screen.height : w3->top;

	/* Check if the dropdown will fully fit below the widget */
	if (top + height >= screen_bottom) {
		w3 = FindWindowById(WC_MAIN_TOOLBAR, 0);
		screen_top = w3 == NULL ? 0 : w3->top + w3->height;

		/* If not, check if it will fit above the widget */
		if (w->top + wi->top - height - 1 > screen_top) {
			top = w->top + wi->top - height - 1;
		} else {
			/* ... and lastly if it won't, enable the scroll bar and fit the
			 * list in below the widget */
			int rows = (screen_bottom - 4 - top) / 10;
			height = rows * 10 + 4;
			scroll = true;
		}
	}

	w2 = AllocateWindow(
		w->left + wi[-1].left + 1,
		top,
		wi->right - wi[-1].left + 1,
		height,
		DropdownMenuWndProc,
		WC_DROPDOWN_MENU,
		_dropdown_menu_widgets);

	w2->widget[0].color = wi->color;
	w2->widget[0].right = wi->right - wi[-1].left;
	w2->widget[0].bottom = height - 1;

	SetWindowWidgetHiddenState(w2, 1, !scroll);

	if (scroll) {
		/* We're scrolling, so enable the scroll bar and shrink the list by
		 * the scrollbar's width */
		w2->widget[1].color  = wi->color;
		w2->widget[1].right  = w2->widget[0].right;
		w2->widget[1].left   = w2->widget[1].right - 11;
		w2->widget[1].bottom = height - 1;
		w2->widget[0].right -= 12;

		w2->vscroll.cap   = (height - 4) / 10;
		w2->vscroll.count = i;
	}

	w2->desc_flags = WDF_DEF_WIDGET;
	w2->flags4 &= ~WF_WHITE_BORDER_MASK;

	WP(w2,dropdown_d).disabled_state = disabled_mask;
	WP(w2,dropdown_d).hidden_state = hidden_mask;

	WP(w2,dropdown_d).parent_wnd_class = w->window_class;
	WP(w2,dropdown_d).parent_wnd_num = w->window_number;
	WP(w2,dropdown_d).parent_button = button;

	WP(w2,dropdown_d).num_items = i;
	WP(w2,dropdown_d).selected_index = selected;
	WP(w2,dropdown_d).items = strings;

	WP(w2,dropdown_d).click_delay = 0;
	WP(w2,dropdown_d).drag_mode = true;
}


static void ResizeWidgets(Window *w, byte a, byte b)
{
	int16 offset = w->widget[a].left;
	int16 length = w->widget[b].right - offset;

	w->widget[a].right  = (length / 2) + offset;

	w->widget[b].left  = w->widget[a].right + 1;
}

static void ResizeWidgets(Window *w, byte a, byte b, byte c)
{
	int16 offset = w->widget[a].left;
	int16 length = w->widget[c].right - offset;

	w->widget[a].right = length / 3;
	w->widget[b].right = w->widget[a].right * 2;

	w->widget[a].right += offset;
	w->widget[b].right += offset;

	/* Now the right side of the buttons are set. We will now set the left sides next to them */
	w->widget[b].left  = w->widget[a].right + 1;
	w->widget[c].left  = w->widget[b].right + 1;
}

/** Evenly distribute some widgets when resizing horizontally (often a button row)
 *  When only two arguments are given, the widgets are presumed to be on a line and only the ends are given
 * @param w Window to modify
 * @param left The leftmost widget to resize
 * @param right The rightmost widget to resize. Since right side of it is used, remember to set it to RESIZE_RIGHT
 */
void ResizeButtons(Window *w, byte left, byte right)
{
	int16 num_widgets = right - left + 1;

	if (num_widgets < 2) NOT_REACHED();

	switch (num_widgets) {
		case 2: ResizeWidgets(w, left, right); break;
		case 3: ResizeWidgets(w, left, left + 1, right); break;
		default: {
			/* Looks like we got more than 3 widgets to resize
			 * Now we will find the middle of the space desinated for the widgets
			 * and place half of the widgets on each side of it and call recursively.
			 * Eventually we will get down to blocks of 2-3 widgets and we got code to handle those cases */
			int16 offset = w->widget[left].left;
			int16 length = w->widget[right].right - offset;
			byte widget = ((num_widgets - 1)/ 2) + left; // rightmost widget of the left side

			/* Now we need to find the middle of the widgets.
			 * It will not always be the middle because if we got an uneven number of widgets,
			 *   we will need it to be 2/5, 3/7 and so on
			 * To get this, we multiply with num_widgets/num_widgets. Since we calculate in int, we will get:
			 *
			 *    num_widgets/2 (rounding down)
			 *   ---------------
			 *     num_widgets
			 *
			 * as multiplier to length. We just multiply before divide to that we stay in the int area though */
			int16 middle = ((length * num_widgets) / (2 * num_widgets)) + offset;

			/* Set left and right on the widgets, that's next to our "middle" */
			w->widget[widget].right = middle;
			w->widget[widget + 1].left = w->widget[widget].right + 1;
			/* Now resize the left and right of the middle */
			ResizeButtons(w, left, widget);
			ResizeButtons(w, widget + 1, right);
		}
	}
}