summaryrefslogtreecommitdiff
path: root/window.c
blob: 1b438b13813537176947f73b7f2df1fbbbad3b05 (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
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
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
/* $Id$ */

#include "stdafx.h"
#include "openttd.h"
#include "debug.h"
#include "functions.h"
#include "map.h"
#include "player.h"
#include "window.h"
#include "gfx.h"
#include "viewport.h"
#include "console.h"
#include "variables.h"
#include "table/sprites.h"
#include "genworld.h"

// delta between mouse cursor and upper left corner of dragged window
static Point _drag_delta;

void HandleButtonClick(Window *w, byte widget)
{
	w->click_state |= (1 << widget);
	w->flags4 |= 5 << WF_TIMEOUT_SHL;
	InvalidateWidget(w, widget);
}


static Window *StartWindowDrag(Window *w);
static Window *StartWindowSizing(Window *w);

static void DispatchLeftClickEvent(Window *w, int x, int y)
{
	WindowEvent e;
	const Widget *wi;

	e.we.click.pt.x = x;
	e.we.click.pt.y = y;
	e.event = WE_CLICK;

	if (w->desc_flags & WDF_DEF_WIDGET) {
		e.we.click.widget = GetWidgetFromPos(w, x, y);
		if (e.we.click.widget < 0) return; /* exit if clicked outside of widgets */

		wi = &w->widget[e.we.click.widget];

		/* don't allow any interaction if the button has been disabled */
		if (HASBIT(w->disabled_state, e.we.click.widget)) return;

		if (wi->type & 0xE0) {
			/* special widget handling for buttons*/
			switch (wi->type) {
			case WWT_IMGBTN  | WWB_PUSHBUTTON: /* WWT_PUSHIMGBTN */
			case WWT_TEXTBTN | WWB_PUSHBUTTON: /* WWT_PUSHTXTBTN */
				HandleButtonClick(w, e.we.click.widget);
				break;
			case WWT_NODISTXTBTN:
				break;
			}
		} else if (wi->type == WWT_SCROLLBAR || wi->type == WWT_SCROLL2BAR || wi->type == WWT_HSCROLLBAR) {
			ScrollbarClickHandler(w, wi, e.we.click.pt.x, e.we.click.pt.y);
		}

		if (w->desc_flags & WDF_STD_BTN) {
			if (e.we.click.widget == 0) { /* 'X' */
				DeleteWindow(w);
				return;
			}

			if (e.we.click.widget == 1) { /* 'Title bar' */
				StartWindowDrag(w); // if not return then w = StartWindowDrag(w); to get correct pointer
				return;
			}
		}

		if (w->desc_flags & WDF_RESIZABLE && wi->type == WWT_RESIZEBOX) {
			StartWindowSizing(w); // if not return then w = StartWindowSizing(w); to get correct pointer
			return;
		}

		if (w->desc_flags & WDF_STICKY_BUTTON && wi->type == WWT_STICKYBOX) {
			w->flags4 ^= WF_STICKY;
			InvalidateWidget(w, e.we.click.widget);
			return;
		}
	}

	w->wndproc(w, &e);
}

static void DispatchRightClickEvent(Window *w, int x, int y)
{
	WindowEvent e;

	/* default tooltips handler? */
	if (w->desc_flags & WDF_STD_TOOLTIPS) {
		e.we.click.widget = GetWidgetFromPos(w, x, y);
		if (e.we.click.widget < 0)
			return; /* exit if clicked outside of widgets */

		if (w->widget[e.we.click.widget].tooltips != 0) {
			GuiShowTooltips(w->widget[e.we.click.widget].tooltips);
			return;
		}
	}

	e.event = WE_RCLICK;
	e.we.click.pt.x = x;
	e.we.click.pt.y = y;
	w->wndproc(w, &e);
}

/** Dispatch the mousewheel-action to the window which will scroll any
 * compatible scrollbars if the mouse is pointed over the bar or its contents
 * @param *w Window
 * @param widget the widget where the scrollwheel was used
 * @param wheel scroll up or down
 */
static void DispatchMouseWheelEvent(Window *w, int widget, int wheel)
{
	const Widget *wi1, *wi2;
	Scrollbar *sb;

	if (widget < 0) return;

	wi1 = &w->widget[widget];
	wi2 = &w->widget[widget + 1];

	/* The listbox can only scroll if scrolling was done on the scrollbar itself,
	 * or on the listbox (and the next item is (must be) the scrollbar)
	 * XXX - should be rewritten as a widget-dependent scroller but that's
	 * not happening until someone rewrites the whole widget-code */
	if ((sb = &w->vscroll,  wi1->type == WWT_SCROLLBAR)  || (sb = &w->vscroll2, wi1->type == WWT_SCROLL2BAR)  ||
			(sb = &w->vscroll2, wi2->type == WWT_SCROLL2BAR) || (sb = &w->vscroll, wi2->type == WWT_SCROLLBAR) ) {

		if (sb->count > sb->cap) {
			int pos = clamp(sb->pos + wheel, 0, sb->count - sb->cap);
			if (pos != sb->pos) {
				sb->pos = pos;
				SetWindowDirty(w);
			}
		}
	}
}


static void DrawOverlappedWindow(Window *w, int left, int top, int right, int bottom);

void DrawOverlappedWindowForAll(int left, int top, int right, int bottom)
{
	Window *w;
	DrawPixelInfo bk;
	_cur_dpi = &bk;

	for (w = _windows; w != _last_window; w++) {
		if (right > w->left &&
				bottom > w->top &&
				left < w->left + w->width &&
				top < w->top + w->height) {
			DrawOverlappedWindow(w, left, top, right, bottom);
		}
	}
}

static void DrawOverlappedWindow(Window *w, int left, int top, int right, int bottom)
{
	const Window *v = w;
	int x;

	while (++v != _last_window) {
		if (right > v->left &&
				bottom > v->top &&
				left < v->left + v->width &&
				top < v->top + v->height) {
			if (left < (x=v->left)) {
				DrawOverlappedWindow(w, left, top, x, bottom);
				DrawOverlappedWindow(w, x, top, right, bottom);
				return;
			}

			if (right > (x=v->left + v->width)) {
				DrawOverlappedWindow(w, left, top, x, bottom);
				DrawOverlappedWindow(w, x, top, right, bottom);
				return;
			}

			if (top < (x=v->top)) {
				DrawOverlappedWindow(w, left, top, right, x);
				DrawOverlappedWindow(w, left, x, right, bottom);
				return;
			}

			if (bottom > (x=v->top + v->height)) {
				DrawOverlappedWindow(w, left, top, right, x);
				DrawOverlappedWindow(w, left, x, right, bottom);
				return;
			}

			return;
		}
	}

	{
		DrawPixelInfo *dp = _cur_dpi;
		dp->width = right - left;
		dp->height = bottom - top;
		dp->left = left - w->left;
		dp->top = top - w->top;
		dp->pitch = _screen.pitch;
		dp->dst_ptr = _screen.dst_ptr + top * _screen.pitch + left;
		dp->zoom = 0;
		CallWindowEventNP(w, WE_PAINT);
	}
}

void CallWindowEventNP(Window *w, int event)
{
	WindowEvent e;

	e.event = event;
	w->wndproc(w, &e);
}

void SetWindowDirty(const Window *w)
{
	if (w == NULL) return;
	SetDirtyBlocks(w->left, w->top, w->left + w->width, w->top + w->height);
}

void DeleteWindow(Window *w)
{
	WindowClass wc;
	WindowNumber wn;
	Window *v;
	int count;

	if (w == NULL) return;

	if (_thd.place_mode != VHM_NONE &&
			_thd.window_class == w->window_class &&
			_thd.window_number == w->window_number) {
		ResetObjectToPlace();
	}

	wc = w->window_class;
	wn = w->window_number;

	CallWindowEventNP(w, WE_DESTROY);

	w = FindWindowById(wc, wn);

	if (w->viewport != NULL) {
		CLRBIT(_active_viewports, w->viewport - _viewports);
		w->viewport->width = 0;
		w->viewport = NULL;
	}

	SetWindowDirty(w);

	free(w->widget);

	v = --_last_window;
	count = (byte*)v - (byte*)w;
	memmove(w, w + 1, count);
}

Window *FindWindowById(WindowClass cls, WindowNumber number)
{
	Window *w;

	for (w = _windows; w != _last_window; w++) {
		if (w->window_class == cls && w->window_number == number) return w;
	}

	return NULL;
}

void DeleteWindowById(WindowClass cls, WindowNumber number)
{
	DeleteWindow(FindWindowById(cls, number));
}

void DeleteWindowByClass(WindowClass cls)
{
	Window *w;

	for (w = _windows; w != _last_window;) {
		if (w->window_class == cls) {
			DeleteWindow(w);
			w = _windows;
		} else {
			w++;
		}
	}
}


static Window *BringWindowToFront(Window *w);

Window *BringWindowToFrontById(WindowClass cls, WindowNumber number)
{
	Window *w = FindWindowById(cls, number);

	if (w != NULL) {
		w->flags4 |= WF_WHITE_BORDER_MASK;
		SetWindowDirty(w);
		w = BringWindowToFront(w);
	}

	return w;
}

static inline bool IsVitalWindow(const Window *w)
{
	WindowClass wc = w->window_class;
	return (wc == WC_MAIN_TOOLBAR || wc == WC_STATUS_BAR || wc == WC_NEWS_WINDOW || wc == WC_SEND_NETWORK_MSG);
}

/** On clicking on a window, make it the frontmost window of all. However
 * there are certain windows that always need to be on-top; these include
 * - Toolbar, Statusbar (always on)
 * - New window, Chatbar (only if open)
 * @param w window that is put into the foreground
 */
static Window *BringWindowToFront(Window *w)
{
	Window *v;
	Window temp;

	v = _last_window;
	do {
		if (--v < _windows) return w;
	} while (IsVitalWindow(v));

	if (w == v) return w;

	assert(w < v);

	temp = *w;
	memmove(w, w + 1, (v - w) * sizeof(Window));
	*v = temp;

	SetWindowDirty(v);

	return v;
}

/** We have run out of windows, so find a suitable candidate for replacement.
 * Keep all important windows intact. These are
 * - Main window (gamefield), Toolbar, Statusbar (always on)
 * - News window, Chatbar (when on)
 * - Any sticked windows since we wanted to keep these
 * @return w pointer to the window that is going to be deleted
 */
static Window *FindDeletableWindow(void)
{
	Window *w;

	for (w = _windows; w < endof(_windows); w++) {
		if (w->window_class != WC_MAIN_WINDOW && !IsVitalWindow(w) && !(w->flags4 & WF_STICKY)) {
			return w;
		}
	}
	return NULL;
}

/** A window must be freed, and all are marked as important windows. Ease the
 * restriction a bit by allowing to delete sticky windows. Keep important/vital
 * windows intact (Main window, Toolbar, Statusbar, News Window, Chatbar)
 * @see FindDeletableWindow()
 * @return w Pointer to the window that is being deleted
 */
static Window *ForceFindDeletableWindow(void)
{
	Window *w;

	for (w = _windows;; w++) {
		assert(w < _last_window);
		if (w->window_class != WC_MAIN_WINDOW && !IsVitalWindow(w)) return w;
	}
}

bool IsWindowOfPrototype(const Window *w, const Widget *widget)
{
	return (w->original_widget == widget);
}

/* Copies 'widget' to 'w->widget' to allow for resizable windows */
void AssignWidgetToWindow(Window *w, const Widget *widget)
{
	w->original_widget = widget;

	if (widget != NULL) {
		uint index = 1;
		const Widget *wi;

		for (wi = widget; wi->type != WWT_LAST; wi++) index++;

		w->widget = realloc(w->widget, sizeof(*w->widget) * index);
		memcpy(w->widget, widget, sizeof(*w->widget) * index);
	} else {
		w->widget = NULL;
	}
}

/* Open a new window.
 * This function is called from AllocateWindow() or AllocateWindowDesc()
 * See descriptions for those functions for usage
 * See AllocateWindow() for description of arguments.
 * Only addition here is window_number, which is the window_number being assigned to the new window
 */
static Window *LocalAllocateWindow(
							int x, int y, int width, int height,
							WindowProc *proc, WindowClass cls, const Widget *widget, int window_number)
{
	Window *w = _last_window; // last window keeps track of the highest open window

	// We have run out of windows, close one and use that as the place for our new one
	if (w >= endof(_windows)) {
		w = FindDeletableWindow();

		if (w == NULL) w = ForceFindDeletableWindow();

		DeleteWindow(w);
		w = _last_window;
	}

	/* XXX - This very strange construction makes sure that the chatbar is always
	 * on top of other windows. Why? It is created as last_window (so, on top).
	 * Any other window will go below toolbar/statusbar/news window, which implicitely
	 * also means it is below the chatbar. Very likely needs heavy improvement
	 * to de-braindeadize */
	if (w != _windows && cls != WC_SEND_NETWORK_MSG) {
		Window *v;

		/* XXX - if not this order (toolbar/statusbar and then news), game would
		 * crash because it will try to copy a negative size for the news-window.
		 * Eg. window was already moved BELOW news (which is below toolbar/statusbar)
		 * and now needs to move below those too. That is a negative move. */
		v = FindWindowById(WC_MAIN_TOOLBAR, 0);
		if (v != NULL) {
			memmove(v+1, v, (byte*)w - (byte*)v);
			w = v;
		}

		v = FindWindowById(WC_STATUS_BAR, 0);
		if (v != NULL) {
			memmove(v+1, v, (byte*)w - (byte*)v);
			w = v;
		}

		v = FindWindowById(WC_NEWS_WINDOW, 0);
		if (v != NULL) {
			memmove(v+1, v, (byte*)w - (byte*)v);
			w = v;
		}
	}

	// Set up window properties
	memset(w, 0, sizeof(Window));
	w->window_class = cls;
	w->flags4 = WF_WHITE_BORDER_MASK; // just opened windows have a white border
	w->caption_color = 0xFF;
	w->left = x;
	w->top = y;
	w->width = width;
	w->height = height;
	w->wndproc = proc;
	AssignWidgetToWindow(w, widget);
	w->resize.width = width;
	w->resize.height = height;
	w->resize.step_width = 1;
	w->resize.step_height = 1;
	w->window_number = window_number;

	_last_window++;

	SetWindowDirty(w);

	CallWindowEventNP(w, WE_CREATE);

	return w;
}

/**
 * Open a new window. If there is no space for a new window, close an open
 * window. Try to avoid stickied windows, but if there is no else, close one of
 * those as well. Then make sure all created windows are below some always-on-top
 * ones. Finally set all variables and call the WE_CREATE event
 * @param x offset in pixels from the left of the screen
 * @param y offset in pixels from the top of the screen
 * @param width width in pixels of the window
 * @param height height in pixels of the window
 * @param *proc @see WindowProc function to call when any messages/updates happen to the window
 * @param cls @see WindowClass class of the window, used for identification and grouping
 * @param *widget @see Widget pointer to the window layout and various elements
 * @return @see Window pointer of the newly created window
 */
Window *AllocateWindow(
							int x, int y, int width, int height,
							WindowProc *proc, WindowClass cls, const Widget *widget)
{
	return LocalAllocateWindow(x, y, width, height, proc, cls, widget, 0);
}

typedef struct SizeRect {
	int left,top,width,height;
} SizeRect;


static SizeRect _awap_r;

static bool IsGoodAutoPlace1(int left, int top)
{
	int right,bottom;
	Window *w;

	_awap_r.left= left;
	_awap_r.top = top;
	right = _awap_r.width + left;
	bottom = _awap_r.height + top;

	if (left < 0 || top < 22 || right > _screen.width || bottom > _screen.height)
		return false;

	// Make sure it is not obscured by any window.
	for (w = _windows; w != _last_window; w++) {
		if (w->window_class == WC_MAIN_WINDOW) continue;

		if (right > w->left &&
				w->left + w->width > left &&
				bottom > w->top &&
				w->top + w->height > top) {
			return false;
		}
	}

	return true;
}

static bool IsGoodAutoPlace2(int left, int top)
{
	int width,height;
	Window *w;

	_awap_r.left= left;
	_awap_r.top = top;
	width = _awap_r.width;
	height = _awap_r.height;

	if (left < -(width>>2) || left > _screen.width - (width>>1))
		return false;
	if (top < 22 || top > _screen.height - (height>>2))
		return false;

	// Make sure it is not obscured by any window.
	for (w = _windows; w != _last_window; w++) {
		if (w->window_class == WC_MAIN_WINDOW) continue;

		if (left + width > w->left &&
				w->left + w->width > left &&
				top + height > w->top &&
				w->top + w->height > top) {
			return false;
		}
	}

	return true;
}

static Point GetAutoPlacePosition(int width, int height)
{
	Window *w;
	Point pt;

	_awap_r.width = width;
	_awap_r.height = height;

	if (IsGoodAutoPlace1(0, 24)) goto ok_pos;

	for (w = _windows; w != _last_window; w++) {
		if (w->window_class == WC_MAIN_WINDOW) continue;

		if (IsGoodAutoPlace1(w->left+w->width+2,w->top)) goto ok_pos;
		if (IsGoodAutoPlace1(w->left-   width-2,w->top)) goto ok_pos;
		if (IsGoodAutoPlace1(w->left,w->top+w->height+2)) goto ok_pos;
		if (IsGoodAutoPlace1(w->left,w->top-   height-2)) goto ok_pos;
		if (IsGoodAutoPlace1(w->left+w->width+2,w->top+w->height-height)) goto ok_pos;
		if (IsGoodAutoPlace1(w->left-   width-2,w->top+w->height-height)) goto ok_pos;
		if (IsGoodAutoPlace1(w->left+w->width-width,w->top+w->height+2)) goto ok_pos;
		if (IsGoodAutoPlace1(w->left+w->width-width,w->top-   height-2)) goto ok_pos;
	}

	for (w = _windows; w != _last_window; w++) {
		if (w->window_class == WC_MAIN_WINDOW) continue;

		if (IsGoodAutoPlace2(w->left+w->width+2,w->top)) goto ok_pos;
		if (IsGoodAutoPlace2(w->left-   width-2,w->top)) goto ok_pos;
		if (IsGoodAutoPlace2(w->left,w->top+w->height+2)) goto ok_pos;
		if (IsGoodAutoPlace2(w->left,w->top-   height-2)) goto ok_pos;
	}

	{
		int left=0,top=24;

restart:;
		for (w = _windows; w != _last_window; w++) {
			if (w->left == left && w->top == top) {
				left += 5;
				top += 5;
				goto restart;
			}
		}

		pt.x = left;
		pt.y = top;
		return pt;
	}

ok_pos:;
	pt.x = _awap_r.left;
	pt.y = _awap_r.top;
	return pt;
}

static Window *LocalAllocateWindowDesc(const WindowDesc *desc, int window_number)
{
	Point pt;
	Window *w;

	if (desc->parent_cls != WC_MAIN_WINDOW &&
			(w = FindWindowById(desc->parent_cls, _alloc_wnd_parent_num), _alloc_wnd_parent_num=0, w) != NULL &&
			w->left < _screen.width-20 && w->left > -60 && w->top < _screen.height-20) {
		pt.x = w->left + 10;
		if (pt.x > _screen.width + 10 - desc->width)
			pt.x = (_screen.width + 10 - desc->width) - 20;
		pt.y = w->top + 10;
	} else if (desc->cls == WC_BUILD_TOOLBAR) { // open Build Toolbars aligned
		/* Override the position if a toolbar is opened according to the place of the maintoolbar
		 * The main toolbar (WC_MAIN_TOOLBAR) is 640px in width */
		switch (_patches.toolbar_pos) {
			case 1:  pt.x = ((_screen.width + 640) >> 1) - desc->width; break;
			case 2:  pt.x = _screen.width - desc->width; break;
			default: pt.x = 640 - desc->width;
		}
		pt.y = desc->top;
	} else {
		pt.x = desc->left;
		pt.y = desc->top;
		if (pt.x == WDP_AUTO) {
			pt = GetAutoPlacePosition(desc->width, desc->height);
		} else {
			if (pt.x == WDP_CENTER) pt.x = (_screen.width - desc->width) >> 1;
			if (pt.y == WDP_CENTER) {
				pt.y = (_screen.height - desc->height) >> 1;
			} else if (pt.y < 0) {
				pt.y = _screen.height + pt.y; // if y is negative, it's from the bottom of the screen
			}
		}
	}

	w = LocalAllocateWindow(pt.x, pt.y, desc->width, desc->height, desc->proc, desc->cls, desc->widgets, window_number);
	w->desc_flags = desc->flags;
	return w;
}

/**
 * Open a new window.
 * @param *desc The pointer to the WindowDesc to be created
 * @return @see Window pointer of the newly created window
 */
Window *AllocateWindowDesc(const WindowDesc *desc)
{
	return LocalAllocateWindowDesc(desc, 0);
}

/**
 * Open a new window.
 * @param *desc The pointer to the WindowDesc to be created
 * @param window_number the window number of the new window
 * @return @see Window pointer of the newly created window
 */
Window *AllocateWindowDescFront(const WindowDesc *desc, int window_number)
{
	Window *w;

	if (BringWindowToFrontById(desc->cls, window_number)) return NULL;
	w = LocalAllocateWindowDesc(desc, window_number);
	return w;
}

Window *FindWindowFromPt(int x, int y)
{
	Window *w;

	for (w = _last_window; w != _windows;) {
		--w;
		if (IS_INSIDE_1D(x, w->left, w->width) &&
				IS_INSIDE_1D(y, w->top, w->height)) {
			return w;
		}
	}

	return NULL;
}

void InitWindowSystem(void)
{
	IConsoleClose();

	memset(&_windows, 0, sizeof(_windows));
	_last_window = _windows;
	memset(_viewports, 0, sizeof(_viewports));
	_active_viewports = 0;
	_no_scroll = 0;
}

void UnInitWindowSystem(void)
{
	Window *w;
	// delete all malloced widgets
	for (w = _windows; w != _last_window; w++) {
		free(w->widget);
		w->widget = NULL;
	}
}

void ResetWindowSystem(void)
{
	UnInitWindowSystem();
	InitWindowSystem();
	_thd.pos.x = 0;
	_thd.pos.y = 0;
	_thd.new_pos.x = 0;
	_thd.new_pos.y = 0;
}

static void DecreaseWindowCounters(void)
{
	Window *w;


	for (w = _last_window; w != _windows;) {
		--w;
		// Unclick scrollbar buttons if they are pressed.
		if (w->flags4 & (WF_SCROLL_DOWN | WF_SCROLL_UP)) {
			w->flags4 &= ~(WF_SCROLL_DOWN | WF_SCROLL_UP);
			SetWindowDirty(w);
		}
		CallWindowEventNP(w, WE_MOUSELOOP);
	}

	for (w = _last_window; w != _windows;) {
		--w;

		if (w->flags4&WF_TIMEOUT_MASK && !(--w->flags4&WF_TIMEOUT_MASK)) {
			CallWindowEventNP(w, WE_TIMEOUT);
			if (w->desc_flags & WDF_UNCLICK_BUTTONS) UnclickWindowButtons(w);
		}
	}
}

Window *GetCallbackWnd(void)
{
	return FindWindowById(_thd.window_class, _thd.window_number);
}

static void HandlePlacePresize(void)
{
	Window *w;
	WindowEvent e;

	if (_special_mouse_mode != WSM_PRESIZE) return;

	w = GetCallbackWnd();
	if (w == NULL) return;

	e.we.place.pt = GetTileBelowCursor();
	if (e.we.place.pt.x == -1) {
		_thd.selend.x = -1;
		return;
	}
	e.we.place.tile = TileVirtXY(e.we.place.pt.x, e.we.place.pt.y);
	e.event = WE_PLACE_PRESIZE;
	w->wndproc(w, &e);
}

static bool HandleDragDrop(void)
{
	Window *w;
	WindowEvent e;

	if (_special_mouse_mode != WSM_DRAGDROP) return true;

	if (_left_button_down) return false;

	w = GetCallbackWnd();

	ResetObjectToPlace();

	if (w != NULL) {
		// send an event in client coordinates.
		e.event = WE_DRAGDROP;
		e.we.dragdrop.pt.x = _cursor.pos.x - w->left;
		e.we.dragdrop.pt.y = _cursor.pos.y - w->top;
		e.we.dragdrop.widget = GetWidgetFromPos(w, e.we.dragdrop.pt.x, e.we.dragdrop.pt.y);
		w->wndproc(w, &e);
	}
	return false;
}

static bool HandlePopupMenu(void)
{
	Window *w;
	WindowEvent e;

	if (!_popup_menu_active) return true;

	w = FindWindowById(WC_TOOLBAR_MENU, 0);
	if (w == NULL) {
		_popup_menu_active = false;
		return false;
	}

	if (_left_button_down) {
		e.event = WE_POPUPMENU_OVER;
		e.we.popupmenu.pt = _cursor.pos;
	} else {
		_popup_menu_active = false;
		e.event = WE_POPUPMENU_SELECT;
		e.we.popupmenu.pt = _cursor.pos;
	}

	w->wndproc(w, &e);

	return false;
}

static bool HandleMouseOver(void)
{
	Window *w;
	WindowEvent e;
	static Window *last_w = NULL;

	w = FindWindowFromPt(_cursor.pos.x, _cursor.pos.y);

	// We changed window, put a MOUSEOVER event to the last window
	if (last_w != NULL && last_w != w) {
		e.event = WE_MOUSEOVER;
		e.we.mouseover.pt.x = -1;
		e.we.mouseover.pt.y = -1;
		if (last_w->wndproc) last_w->wndproc(last_w, &e);
	}
	last_w = w;

	if (w != NULL) {
		// send an event in client coordinates.
		e.event = WE_MOUSEOVER;
		e.we.mouseover.pt.x = _cursor.pos.x - w->left;
		e.we.mouseover.pt.y = _cursor.pos.y - w->top;
		if (w->widget != NULL) {
			e.we.mouseover.widget = GetWidgetFromPos(w, e.we.mouseover.pt.x, e.we.mouseover.pt.y);
		}
		w->wndproc(w, &e);
	}

	// Mouseover never stops execution
	return true;
}


static bool _dragging_window;

static bool HandleWindowDragging(void)
{
	Window *w;
	// Get out immediately if no window is being dragged at all.
	if (!_dragging_window) return true;

	// Otherwise find the window...
	for (w = _windows; w != _last_window; w++) {
		if (w->flags4 & WF_DRAGGING) {
			const Widget *t = &w->widget[1]; // the title bar ... ugh
			const Window *v;
			int x;
			int y;
			int nx;
			int ny;

			// Stop the dragging if the left mouse button was released
			if (!_left_button_down) {
				w->flags4 &= ~WF_DRAGGING;
				break;
			}

			SetWindowDirty(w);

			x = _cursor.pos.x + _drag_delta.x;
			y = _cursor.pos.y + _drag_delta.y;
			nx = x;
			ny = y;

			if (_patches.window_snap_radius != 0) {
				int hsnap = _patches.window_snap_radius;
				int vsnap = _patches.window_snap_radius;
				int delta;

				for (v = _windows; v != _last_window; ++v) {
					if (v == w) continue; // Don't snap at yourself

					if (y + w->height > v->top && y < v->top + v->height) {
						// Your left border <-> other right border
						delta = abs(v->left + v->width - x);
						if (delta <= hsnap) {
							nx = v->left + v->width;
							hsnap = delta;
						}

						// Your right border <-> other left border
						delta = abs(v->left - x - w->width);
						if (delta <= hsnap) {
							nx = v->left - w->width;
							hsnap = delta;
						}
					}

					if (w->top + w->height >= v->top && w->top <= v->top + v->height) {
						// Your left border <-> other left border
						delta = abs(v->left - x);
						if (delta <= hsnap) {
							nx = v->left;
							hsnap = delta;
						}

						// Your right border <-> other right border
						delta = abs(v->left + v->width - x - w->width);
						if (delta <= hsnap) {
							nx = v->left + v->width - w->width;
							hsnap = delta;
						}
					}

					if (x + w->width > v->left && x < v->left + v->width) {
						// Your top border <-> other bottom border
						delta = abs(v->top + v->height - y);
						if (delta <= vsnap) {
							ny = v->top + v->height;
							vsnap = delta;
						}

						// Your bottom border <-> other top border
						delta = abs(v->top - y - w->height);
						if (delta <= vsnap) {
							ny = v->top - w->height;
							vsnap = delta;
						}
					}

					if (w->left + w->width >= v->left && w->left <= v->left + v->width) {
						// Your top border <-> other top border
						delta = abs(v->top - y);
						if (delta <= vsnap) {
							ny = v->top;
							vsnap = delta;
						}

						// Your bottom border <-> other bottom border
						delta = abs(v->top + v->height - y - w->height);
						if (delta <= vsnap) {
							ny = v->top + v->height - w->height;
							vsnap = delta;
						}
					}
				}
			}

			// Make sure the window doesn't leave the screen
			// 13 is the height of the title bar
			nx = clamp(nx, 13 - t->right, _screen.width - 13 - t->left);
			ny = clamp(ny, 0, _screen.height - 13);

			// Make sure the title bar isn't hidden by behind the main tool bar
			v = FindWindowById(WC_MAIN_TOOLBAR, 0);
			if (v != NULL) {
				int v_bottom = v->top + v->height;
				int v_right = v->left + v->width;
				if (ny + t->top >= v->top && ny + t->top < v_bottom) {
					if ((v->left < 13 && nx + t->left < v->left) ||
							(v_right > _screen.width - 13 && nx + t->right > v_right)) {
						ny = v_bottom;
					} else {
						if (nx + t->left > v->left - 13 &&
								nx + t->right < v_right + 13) {
							if (w->top >= v_bottom) {
								ny = v_bottom;
							} else if (w->left < nx) {
								nx = v->left - 13 - t->left;
							} else {
								nx = v_right + 13 - t->right;
							}
						}
					}
				}
			}

			if (w->viewport != NULL) {
				w->viewport->left += nx - w->left;
				w->viewport->top  += ny - w->top;
			}
			w->left = nx;
			w->top  = ny;

			SetWindowDirty(w);
			return false;
		} else if (w->flags4 & WF_SIZING) {
			WindowEvent e;
			int x, y;

			/* Stop the sizing if the left mouse button was released */
			if (!_left_button_down) {
				w->flags4 &= ~WF_SIZING;
				SetWindowDirty(w);
				break;
			}

			x = _cursor.pos.x - _drag_delta.x;
			y = _cursor.pos.y - _drag_delta.y;

			/* X and Y has to go by step.. calculate it.
			 * The cast to int is necessary else x/y are implicitly casted to
			 * unsigned int, which won't work. */
			if (w->resize.step_width > 1) x -= x % (int)w->resize.step_width;

			if (w->resize.step_height > 1) y -= y % (int)w->resize.step_height;

			/* Check if we don't go below the minimum set size */
			if ((int)w->width + x < (int)w->resize.width)
				x = w->resize.width - w->width;
			if ((int)w->height + y < (int)w->resize.height)
				y = w->resize.height - w->height;

			/* Window already on size */
			if (x == 0 && y == 0) return false;

			/* Now find the new cursor pos.. this is NOT _cursor, because
			    we move in steps. */
			_drag_delta.x += x;
			_drag_delta.y += y;

			SetWindowDirty(w);

			/* Scroll through all the windows and update the widgets if needed */
			{
				Widget *wi = w->widget;
				bool resize_height = false;
				bool resize_width = false;

				while (wi->type != WWT_LAST) {
					if (wi->resize_flag != RESIZE_NONE) {
						/* Resize this widget */
						if (wi->resize_flag & RESIZE_LEFT) {
							wi->left += x;
							resize_width = true;
						}
						if (wi->resize_flag & RESIZE_RIGHT) {
							wi->right += x;
							resize_width = true;
						}

						if (wi->resize_flag & RESIZE_TOP) {
							wi->top += y;
							resize_height = true;
						}
						if (wi->resize_flag & RESIZE_BOTTOM) {
							wi->bottom += y;
							resize_height = true;
						}
					}
					wi++;
				}

				/* We resized at least 1 widget, so let's rezise the window totally */
				if (resize_width)  w->width  = x + w->width;
				if (resize_height) w->height = y + w->height;
			}

			e.event = WE_RESIZE;
			e.we.sizing.size.x = x + w->width;
			e.we.sizing.size.y = y + w->height;
			e.we.sizing.diff.x = x;
			e.we.sizing.diff.y = y;
			w->wndproc(w, &e);

			SetWindowDirty(w);
			return false;
		}
	}

	_dragging_window = false;
	return false;
}

static Window *StartWindowDrag(Window *w)
{
	w->flags4 |= WF_DRAGGING;
	_dragging_window = true;

	_drag_delta.x = w->left - _cursor.pos.x;
	_drag_delta.y = w->top  - _cursor.pos.y;

	w = BringWindowToFront(w);
	DeleteWindowById(WC_DROPDOWN_MENU, 0);
	return w;
}

static Window *StartWindowSizing(Window *w)
{
	w->flags4 |= WF_SIZING;
	_dragging_window = true;

	_drag_delta.x = _cursor.pos.x;
	_drag_delta.y = _cursor.pos.y;

	w = BringWindowToFront(w);
	DeleteWindowById(WC_DROPDOWN_MENU, 0);
	SetWindowDirty(w);
	return w;
}


static bool HandleScrollbarScrolling(void)
{
	Window *w;
	int i;
	int pos;
	Scrollbar *sb;

	// Get out quickly if no item is being scrolled
	if (!_scrolling_scrollbar) return true;

	// Find the scrolling window
	for (w = _windows; w != _last_window; w++) {
		if (w->flags4 & WF_SCROLL_MIDDLE) {
			// Abort if no button is clicked any more.
			if (!_left_button_down) {
				w->flags4 &= ~WF_SCROLL_MIDDLE;
				SetWindowDirty(w);
				break;
			}

			if (w->flags4 & WF_HSCROLL) {
				sb = &w->hscroll;
				i = _cursor.pos.x - _cursorpos_drag_start.x;
			} else if (w->flags4 & WF_SCROLL2){
				sb = &w->vscroll2;
				i = _cursor.pos.y - _cursorpos_drag_start.y;
			} else {
				sb = &w->vscroll;
				i = _cursor.pos.y - _cursorpos_drag_start.y;
			}

			// Find the item we want to move to and make sure it's inside bounds.
			pos = min(max(0, i + _scrollbar_start_pos) * sb->count / _scrollbar_size, max(0, sb->count - sb->cap));
			if (pos != sb->pos) {
				sb->pos = pos;
				SetWindowDirty(w);
			}
			return false;
		}
	}

	_scrolling_scrollbar = false;
	return false;
}

static bool HandleViewportScroll(void)
{
	WindowEvent e;
	Window *w;

	if (!_scrolling_viewport) return true;

	w = FindWindowFromPt(_cursor.pos.x, _cursor.pos.y);

	if (!_right_button_down || w == NULL) {
		_cursor.fix_at = false;
		_scrolling_viewport = false;
		return true;
	}

	if (_patches.reverse_scroll) {
		e.we.scroll.delta.x = -_cursor.delta.x;
		e.we.scroll.delta.y = -_cursor.delta.y;
	} else {
		e.we.scroll.delta.x = _cursor.delta.x;
		e.we.scroll.delta.y = _cursor.delta.y;
	}

	/* Create a scroll-event and send it to the window */
	e.event = WE_SCROLL;
	w->wndproc(w, &e);

	_cursor.delta.x = 0;
	_cursor.delta.y = 0;
	return false;
}

static Window *MaybeBringWindowToFront(Window *w)
{
	Window *u;

	if (w->window_class == WC_MAIN_WINDOW ||
			IsVitalWindow(w) ||
			w->window_class == WC_TOOLTIPS ||
			w->window_class == WC_DROPDOWN_MENU) {
		return w;
	}

	for (u = w; ++u != _last_window;) {
		if (u->window_class == WC_MAIN_WINDOW ||
				IsVitalWindow(u) ||
				u->window_class == WC_TOOLTIPS ||
				u->window_class == WC_DROPDOWN_MENU) {
			continue;
		}

		if (w->left + w->width <= u->left ||
				u->left + u->width <= w->left ||
				w->top  + w->height <= u->top ||
				u->top + u->height <= w->top) {
			continue;
		}

		return BringWindowToFront(w);
	}

	return w;
}

/** Send a message from one window to another. The receiving window is found by
 * @param w @see Window pointer pointing to the other window
 * @param msg Specifies the message to be sent
 * @param wparam Specifies additional message-specific information
 * @param lparam Specifies additional message-specific information
 */
static void SendWindowMessageW(Window *w, uint msg, uint wparam, uint lparam)
{
	WindowEvent e;

	e.event             = WE_MESSAGE;
	e.we.message.msg    = msg;
	e.we.message.wparam = wparam;
	e.we.message.lparam = lparam;

	w->wndproc(w, &e);
}

/** Send a message from one window to another. The receiving window is found by
 * @param wnd_class @see WindowClass class AND
 * @param wnd_num @see WindowNumber number, mostly 0
 * @param msg Specifies the message to be sent
 * @param wparam Specifies additional message-specific information
 * @param lparam Specifies additional message-specific information
 */
void SendWindowMessage(WindowClass wnd_class, WindowNumber wnd_num, uint msg, uint wparam, uint lparam)
{
	Window *w = FindWindowById(wnd_class, wnd_num);
	if (w != NULL) SendWindowMessageW(w, msg, wparam, lparam);
}

static void HandleKeypress(uint32 key)
{
	Window *w;
	WindowEvent e;
	/* Stores if a window with a textfield for typing is open
	 * If this is the case, keypress events are only passed to windows with text fields and
	 * to thein this main toolbar. */
	bool query_open = false;

	// Setup event
	e.event = WE_KEYPRESS;
	e.we.keypress.ascii = key & 0xFF;
	e.we.keypress.keycode = key >> 16;
	e.we.keypress.cont = true;

	// check if we have a query string window open before allowing hotkeys
	if (FindWindowById(WC_QUERY_STRING,       0) != NULL ||
			FindWindowById(WC_SEND_NETWORK_MSG,   0) != NULL ||
			FindWindowById(WC_GENERATE_LANDSCAPE, 0) != NULL ||
			FindWindowById(WC_CONSOLE,            0) != NULL ||
			FindWindowById(WC_SAVELOAD,           0) != NULL) {
		query_open = true;
	}

	// Call the event, start with the uppermost window.
	for (w = _last_window; w != _windows;) {
		--w;
		// if a query window is open, only call the event for certain window types
		if (query_open &&
				w->window_class != WC_QUERY_STRING &&
				w->window_class != WC_SEND_NETWORK_MSG &&
				w->window_class != WC_GENERATE_LANDSCAPE &&
				w->window_class != WC_CONSOLE &&
				w->window_class != WC_SAVELOAD) {
			continue;
		}
		w->wndproc(w, &e);
		if (!e.we.keypress.cont) break;
	}

	if (e.we.keypress.cont) {
		w = FindWindowById(WC_MAIN_TOOLBAR, 0);
		// When there is no toolbar w is null, check for that
		if (w != NULL) w->wndproc(w, &e);
	}
}

extern void UpdateTileSelection(void);
extern bool VpHandlePlaceSizingDrag(void);

static void MouseLoop(int click, int mousewheel)
{
	int x,y;
	Window *w;
	ViewPort *vp;

	DecreaseWindowCounters();
	HandlePlacePresize();
	UpdateTileSelection();
	if (!VpHandlePlaceSizingDrag())  return;
	if (!HandleDragDrop())           return;
	if (!HandlePopupMenu())          return;
	if (!HandleWindowDragging())     return;
	if (!HandleScrollbarScrolling()) return;
	if (!HandleViewportScroll())     return;
	if (!HandleMouseOver())          return;

	x = _cursor.pos.x;
	y = _cursor.pos.y;

	if (click == 0 && mousewheel == 0) {
		if (_patches.autoscroll && _game_mode != GM_MENU && !IsGeneratingWorld()) {
			w = FindWindowFromPt(x, y);
			if (w == NULL || w->flags4 & WF_DISABLE_VP_SCROLL) return;
			vp = IsPtInWindowViewport(w, x, y);
			if (vp != NULL) {
				x -= vp->left;
				y -= vp->top;
				//here allows scrolling in both x and y axis
#define scrollspeed 3
				if (x - 15 < 0) {
					WP(w, vp_d).scrollpos_x += (x - 15) * scrollspeed << vp->zoom;
				} else if (15 - (vp->width - x) > 0) {
					WP(w, vp_d).scrollpos_x += (15 - (vp->width - x)) * scrollspeed << vp->zoom;
				}
				if (y - 15 < 0) {
					WP(w, vp_d).scrollpos_y += (y - 15) * scrollspeed << vp->zoom;
				} else if (15 - (vp->height - y) > 0) {
					WP(w,vp_d).scrollpos_y += (15 - (vp->height - y)) * scrollspeed << vp->zoom;
				}
#undef scrollspeed
			}
		}
		return;
	}

	w = FindWindowFromPt(x, y);
	if (w == NULL) return;
	w = MaybeBringWindowToFront(w);
	vp = IsPtInWindowViewport(w, x, y);

	/* Don't allow any action in a viewport if either in menu of in generating world */
	if (vp != NULL && (_game_mode == GM_MENU || IsGeneratingWorld())) return;

	if (mousewheel != 0) {
		WindowEvent e;

		/* Send WE_MOUSEWHEEL event to window */
		e.event = WE_MOUSEWHEEL;
		e.we.wheel.wheel = mousewheel;
		w->wndproc(w, &e);

		/* Dispatch a MouseWheelEvent for widgets if it is not a viewport */
		if (vp == NULL) DispatchMouseWheelEvent(w, GetWidgetFromPos(w, x - w->left, y - w->top), mousewheel);
	}

	if (vp != NULL) {
		switch (click) {
			case 1:
				DEBUG(misc, 2) ("cursor: 0x%X (%d)", _cursor.sprite, _cursor.sprite);
				if (_thd.place_mode != 0 &&
						// query button and place sign button work in pause mode
						_cursor.sprite != SPR_CURSOR_QUERY &&
						_cursor.sprite != SPR_CURSOR_SIGN &&
						_pause != 0 &&
						!_cheats.build_in_pause.value) {
					return;
				}

				if (_thd.place_mode == 0) {
					HandleViewportClicked(vp, x, y);
				} else {
					PlaceObject();
				}
				break;

			case 2:
				if (!(w->flags4 & WF_DISABLE_VP_SCROLL)) {
					_scrolling_viewport = true;
					_cursor.fix_at = true;
				}
				break;
		}
	} else {
		switch (click) {
			case 1: DispatchLeftClickEvent(w, x - w->left, y - w->top);  break;
			case 2: DispatchRightClickEvent(w, x - w->left, y - w->top); break;
		}
	}
}

void InputLoop(void)
{
	int click;
	int mousewheel;

	/*
	 * During the generation of the world, there might be
	 * another thread that is currently building for example
	 * a road. To not interfere with those tasks, we should
	 * NOT change the _current_player here.
	 *
	 * This is not necessary either, as the only events that
	 * can be handled are the 'close application' events
	 */
	if (!IsGeneratingWorld()) _current_player = _local_player;

	// Handle pressed keys
	if (_pressed_key != 0) {
		HandleKeypress(_pressed_key);
		_pressed_key = 0;
	}

	// Mouse event?
	click = 0;
	if (_left_button_down && !_left_button_clicked) {
		_left_button_clicked = true;
		click = 1;
	} else if (_right_button_clicked) {
		_right_button_clicked = false;
		click = 2;
	}

	mousewheel = 0;
	if (_cursor.wheel) {
		mousewheel = _cursor.wheel;
		_cursor.wheel = 0;
	}

	MouseLoop(click, mousewheel);
}


static int _we4_timer;

void UpdateWindows(void)
{
	Window *w;
	int t;

	t = _we4_timer + 1;
	if (t >= 100) {
		for (w = _last_window; w != _windows;) {
			w--;
			CallWindowEventNP(w, WE_4);
		}
		t = 0;
	}
	_we4_timer = t;

	for (w = _last_window; w != _windows;) {
		w--;
		if (w->flags4 & WF_WHITE_BORDER_MASK) {
			w->flags4 -= WF_WHITE_BORDER_ONE;
			if (!(w->flags4 & WF_WHITE_BORDER_MASK)) {
				SetWindowDirty(w);
			}
		}
	}

	DrawDirtyBlocks();

	for (w = _windows; w != _last_window; w++) {
		if (w->viewport != NULL) UpdateViewportPosition(w);
	}
	DrawTextMessage();
	// Redraw mouse cursor in case it was hidden
	DrawMouseCursor();
}


int GetMenuItemIndex(const Window *w, int x, int y)
{
	if ((x -= w->left) >= 0 && x < w->width && (y -= w->top + 1) >= 0) {
		y /= 10;

		if (y < WP(w, const menu_d).item_count &&
				!HASBIT(WP(w, const menu_d).disabled_items, y)) {
			return y;
		}
	}
	return -1;
}

void InvalidateWindow(WindowClass cls, WindowNumber number)
{
	const Window *w;

	for (w = _windows; w != _last_window; w++) {
		if (w->window_class == cls && w->window_number == number) SetWindowDirty(w);
	}
}

void InvalidateWidget(const Window *w, byte widget_index)
{
	const Widget *wi = &w->widget[widget_index];

	/* Don't redraw the window if the widget is invisible or of no-type */
	if (wi->type == WWT_EMPTY || HASBIT(w->hidden_state, widget_index)) return;

	SetDirtyBlocks(w->left + wi->left, w->top + wi->top, w->left + wi->right + 1, w->top + wi->bottom + 1);
}

void InvalidateWindowWidget(WindowClass cls, WindowNumber number, byte widget_index)
{
	const Window *w;

	for (w = _windows; w != _last_window; w++) {
		if (w->window_class == cls && w->window_number == number) {
			InvalidateWidget(w, widget_index);
		}
	}
}

void InvalidateWindowClasses(WindowClass cls)
{
	const Window *w;

	for (w = _windows; w != _last_window; w++) {
		if (w->window_class == cls) SetWindowDirty(w);
	}
}


void CallWindowTickEvent(void)
{
	Window *w;

	for (w = _last_window; w != _windows;) {
		--w;
		CallWindowEventNP(w, WE_TICK);
	}
}

void DeleteNonVitalWindows(void)
{
	Window *w;

	for (w = _windows; w != _last_window;) {
		if (w->window_class != WC_MAIN_WINDOW &&
				w->window_class != WC_SELECT_GAME &&
				w->window_class != WC_MAIN_TOOLBAR &&
				w->window_class != WC_STATUS_BAR &&
				w->window_class != WC_TOOLBAR_MENU &&
				w->window_class != WC_TOOLTIPS &&
				(w->flags4 & WF_STICKY) == 0) { // do not delete windows which are 'pinned'
			DeleteWindow(w);
			w = _windows;
		} else {
			w++;
		}
	}
}

/* It is possible that a stickied window gets to a position where the
 * 'close' button is outside the gaming area. You cannot close it then; except
 * with this function. It closes all windows calling the standard function,
 * then, does a little hacked loop of closing all stickied windows. Note
 * that standard windows (status bar, etc.) are not stickied, so these aren't affected */
void DeleteAllNonVitalWindows(void)
{
	Window *w;

	// Delete every window except for stickied ones
	DeleteNonVitalWindows();
	// Delete all sticked windows
	for (w = _windows; w != _last_window;) {
		if (w->flags4 & WF_STICKY) {
			DeleteWindow(w);
			w = _windows;
		} else {
			w++;
		}
	}
}

/* Delete all always on-top windows to get an empty screen */
void HideVitalWindows(void)
{
	DeleteWindowById(WC_MAIN_TOOLBAR, 0);
	DeleteWindowById(WC_STATUS_BAR, 0);
}

int PositionMainToolbar(Window *w)
{
	DEBUG(misc, 1) ("Repositioning Main Toolbar...");

	if (w == NULL || w->window_class != WC_MAIN_TOOLBAR) {
		w = FindWindowById(WC_MAIN_TOOLBAR, 0);
	}

	switch (_patches.toolbar_pos) {
		case 1:  w->left = (_screen.width - w->width) >> 1; break;
		case 2:  w->left = _screen.width - w->width; break;
		default: w->left = 0;
	}
	SetDirtyBlocks(0, 0, _screen.width, w->height); // invalidate the whole top part
	return w->left;
}

void RelocateAllWindows(int neww, int newh)
{
	Window *w;

	for (w = _windows; w != _last_window; w++) {
		int left, top;

		if (w->window_class == WC_MAIN_WINDOW) {
			ViewPort *vp = w->viewport;
			vp->width = w->width = neww;
			vp->height = w->height = newh;
			vp->virtual_width = neww << vp->zoom;
			vp->virtual_height = newh << vp->zoom;
			continue; // don't modify top,left
		}

		IConsoleResize();

		switch (w->window_class) {
			case WC_MAIN_TOOLBAR:
				top = w->top;
				left = PositionMainToolbar(w); // changes toolbar orientation
				break;

			case WC_SELECT_GAME:
			case WC_GAME_OPTIONS:
			case WC_NETWORK_WINDOW:
				top = (newh - w->height) >> 1;
				left = (neww - w->width) >> 1;
				break;

			case WC_NEWS_WINDOW:
				top = newh - w->height;
				left = (neww - w->width) >> 1;
				break;

			case WC_STATUS_BAR:
				top = newh - w->height;
				left = (neww - w->width) >> 1;
				break;

			case WC_SEND_NETWORK_MSG:
				top = (newh - 26); // 26 = height of status bar + height of chat bar
				left = (neww - w->width) >> 1;
				break;

			default:
				left = w->left;
				if (left + (w->width >> 1) >= neww) left = neww - w->width;
				top = w->top;
				if (top + (w->height >> 1) >= newh) top = newh - w->height;
				break;
		}

		if (w->viewport != NULL) {
			w->viewport->left += left - w->left;
			w->viewport->top += top - w->top;
		}

		w->left = left;
		w->top = top;
	}
}