summaryrefslogtreecommitdiff
path: root/src/newgrf_gui.cpp
blob: cc8413408fae883773de053e3abe22f92f32e246 (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
1693
1694
1695
1696
/* $Id$ */

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file newgrf_gui.cpp GUI to change NewGRF settings. */

#include "stdafx.h"
#include "gui.h"
#include "newgrf.h"
#include "strings_func.h"
#include "window_func.h"
#include "gamelog.h"
#include "settings_type.h"
#include "settings_func.h"
#include "widgets/dropdown_type.h"
#include "network/network.h"
#include "network/network_content.h"
#include "sortlist_type.h"
#include "querystring_gui.h"
#include "core/geometry_func.hpp"
#include "newgrf_text.h"
#include "fileio_func.h"

#include "table/strings.h"
#include "table/sprites.h"

/**
 * Show the first NewGRF error we can find.
 */
void ShowNewGRFError()
{
	/* Do not show errors when entering the main screen */
	if (_game_mode == GM_MENU) return;

	for (const GRFConfig *c = _grfconfig; c != NULL; c = c->next) {
		/* We only want to show fatal errors */
		if (c->error == NULL || c->error->severity != STR_NEWGRF_ERROR_MSG_FATAL) continue;

		SetDParam   (0, c->error->custom_message == NULL ? c->error->message : STR_JUST_RAW_STRING);
		SetDParamStr(1, c->error->custom_message);
		SetDParam   (2, STR_JUST_RAW_STRING);
		SetDParamStr(3, c->filename);
		SetDParam   (4, STR_JUST_RAW_STRING);
		SetDParamStr(5, c->error->data);
		for (uint i = 0; i < c->error->num_params; i++) {
			SetDParam(6 + i, c->error->param_value[i]);
		}
		ShowErrorMessage(STR_NEWGRF_ERROR_FATAL_POPUP, INVALID_STRING_ID, WL_CRITICAL);
		break;
	}
}

static void ShowNewGRFInfo(const GRFConfig *c, uint x, uint y, uint right, uint bottom, bool show_params)
{
	if (c->error != NULL) {
		char message[512];
		SetDParamStr(0, c->error->custom_message); // is skipped by built-in messages
		SetDParam   (1, STR_JUST_RAW_STRING);
		SetDParamStr(2, c->filename);
		SetDParam   (3, STR_JUST_RAW_STRING);
		SetDParamStr(4, c->error->data);
		for (uint i = 0; i < c->error->num_params; i++) {
			SetDParam(5 + i, c->error->param_value[i]);
		}
		GetString(message, c->error->custom_message == NULL ? c->error->message : STR_JUST_RAW_STRING, lastof(message));

		SetDParamStr(0, message);
		y = DrawStringMultiLine(x, right, y, bottom, c->error->severity);
	}

	/* Draw filename or not if it is not known (GRF sent over internet) */
	if (c->filename != NULL) {
		SetDParamStr(0, c->filename);
		y = DrawStringMultiLine(x, right, y, bottom, STR_NEWGRF_SETTINGS_FILENAME);
	}

	/* Prepare and draw GRF ID */
	char buff[256];
	snprintf(buff, lengthof(buff), "%08X", BSWAP32(c->ident.grfid));
	SetDParamStr(0, buff);
	y = DrawStringMultiLine(x, right, y, bottom, STR_NEWGRF_SETTINGS_GRF_ID);

	if ((_settings_client.gui.newgrf_developer_tools || _settings_client.gui.newgrf_show_old_versions) && c->version != 0) {
		SetDParam(0, c->version);
		y = DrawStringMultiLine(x, right, y, bottom, STR_NEWGRF_SETTINGS_VERSION);
	}
	if ((_settings_client.gui.newgrf_developer_tools || _settings_client.gui.newgrf_show_old_versions) && c->min_loadable_version != 0) {
		SetDParam(0, c->min_loadable_version);
		y = DrawStringMultiLine(x, right, y, bottom, STR_NEWGRF_SETTINGS_MIN_VERSION);
	}

	/* Prepare and draw MD5 sum */
	md5sumToString(buff, lastof(buff), c->ident.md5sum);
	SetDParamStr(0, buff);
	y = DrawStringMultiLine(x, right, y, bottom, STR_NEWGRF_SETTINGS_MD5SUM);

	/* Show GRF parameter list */
	if (show_params) {
		if (c->num_params > 0) {
			GRFBuildParamList(buff, c, lastof(buff));
			SetDParam(0, STR_JUST_RAW_STRING);
			SetDParamStr(1, buff);
		} else {
			SetDParam(0, STR_LAND_AREA_INFORMATION_LOCAL_AUTHORITY_NONE);
		}
		y = DrawStringMultiLine(x, right, y, bottom, STR_NEWGRF_SETTINGS_PARAMETER);

		/* Draw the palette of the NewGRF */
		SetDParamStr(0, (c->palette & GRFP_USE_WINDOWS) ? "Windows" : "DOS");
		y = DrawStringMultiLine(x, right, y, bottom, STR_NEWGRF_SETTINGS_PALETTE);
	}

	/* Show flags */
	if (c->status == GCS_NOT_FOUND)       y = DrawStringMultiLine(x, right, y, bottom, STR_NEWGRF_SETTINGS_NOT_FOUND);
	if (c->status == GCS_DISABLED)        y = DrawStringMultiLine(x, right, y, bottom, STR_NEWGRF_SETTINGS_DISABLED);
	if (HasBit(c->flags, GCF_INVALID))    y = DrawStringMultiLine(x, right, y, bottom, STR_NEWGRF_SETTINGS_INCOMPATIBLE);
	if (HasBit(c->flags, GCF_COMPATIBLE)) y = DrawStringMultiLine(x, right, y, bottom, STR_NEWGRF_COMPATIBLE_LOADED);

	/* Draw GRF info if it exists */
	if (!StrEmpty(c->GetDescription())) {
		SetDParam(0, STR_JUST_RAW_STRING);
		SetDParamStr(1, c->GetDescription());
		y = DrawStringMultiLine(x, right, y, bottom, STR_BLACK_STRING);
	} else {
		y = DrawStringMultiLine(x, right, y, bottom, STR_NEWGRF_SETTINGS_NO_INFO);
	}
}


/** Enum referring to the widgets of the NewGRF parameters window */
enum ShowNewGRFParametersWidgets {
	GRFPAR_WIDGET_SHOW_NUMPAR,      ///< #NWID_SELECTION to optionally display #GRFPAR_WIDGET_NUMPAR
	GRFPAR_WIDGET_NUMPAR_DEC,       ///< Button to decrease number of parameters
	GRFPAR_WIDGET_NUMPAR_INC,       ///< Button to increase number of parameters
	GRFPAR_WIDGET_NUMPAR,           ///< Optional number of parameters
	GRFPAR_WIDGET_NUMPAR_TEXT,      ///< Text description
	GRFPAR_WIDGET_BACKGROUND,       ///< Panel to draw the settings on
	GRFPAR_WIDGET_SCROLLBAR,        ///< Scrollbar to scroll through all settings
	GRFPAR_WIDGET_ACCEPT,           ///< Accept button
	GRFPAR_WIDGET_RESET,            ///< Reset button
	GRFPAR_WIDGET_SHOW_DESCRIPTION, ///< #NWID_SELECTION to optionally display parameter descriptions
	GRFPAR_WIDGET_DESCRIPTION,      ///< Multi-line description of a parameter
};

/**
 * Window for setting the parameters of a NewGRF.
 */
struct NewGRFParametersWindow : public Window {
	static GRFParameterInfo dummy_parameter_info; ///< Dummy info in case a newgrf didn't provide info about some parameter.
	GRFConfig *grf_config; ///< Set the parameters of this GRFConfig.
	uint clicked_button;   ///< The row in which a button was clicked or UINT_MAX.
	bool clicked_increase; ///< True if the increase button was clicked, false for the decrease button.
	int timeout;           ///< How long before we unpress the last-pressed button?
	uint clicked_row;      ///< The selected parameter
	int line_height;       ///< Height of a row in the matrix widget.
	Scrollbar *vscroll;
	bool action14present;  ///< True if action14 information is present.

	NewGRFParametersWindow(const WindowDesc *desc, GRFConfig *c) : Window(),
		grf_config(c),
		clicked_button(UINT_MAX),
		timeout(0),
		clicked_row(UINT_MAX)
	{
		this->action14present = (c->num_valid_params != lengthof(c->param) || c->param_info.Length() != 0);

		this->CreateNestedTree(desc);
		this->vscroll = this->GetScrollbar(GRFPAR_WIDGET_SCROLLBAR);
		this->GetWidget<NWidgetStacked>(GRFPAR_WIDGET_SHOW_NUMPAR)->SetDisplayedPlane(this->action14present ? SZSP_HORIZONTAL : 0);
		this->GetWidget<NWidgetStacked>(GRFPAR_WIDGET_SHOW_DESCRIPTION)->SetDisplayedPlane(this->action14present ? 0 : SZSP_HORIZONTAL);
		this->FinishInitNested(desc);  // Initializes 'this->line_height' as side effect.

		this->InvalidateData();
	}

	/**
	 * Get a dummy parameter-info object with default information.
	 * @param nr The param number that should be changed.
	 * @return GRFParameterInfo with dummy information about the given parameter.
	 */
	static GRFParameterInfo *GetDummyParameterInfo(uint nr)
	{
		dummy_parameter_info.param_nr = nr;
		return &dummy_parameter_info;
	}

	virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
	{
		switch (widget) {
			case GRFPAR_WIDGET_NUMPAR_DEC:
			case GRFPAR_WIDGET_NUMPAR_INC: {
				size->width = size->height = FONT_HEIGHT_NORMAL;
				break;
			}

			case GRFPAR_WIDGET_NUMPAR: {
				SetDParam(0, 999);
				Dimension d = GetStringBoundingBox(this->GetWidget<NWidgetCore>(widget)->widget_data);
				d.width += padding.width;
				d.height += padding.height;
				*size = maxdim(*size, d);
				break;
			}

			case GRFPAR_WIDGET_BACKGROUND:
				this->line_height = FONT_HEIGHT_NORMAL + WD_MATRIX_TOP + WD_MATRIX_BOTTOM;

				resize->width = 1;
				resize->height = this->line_height;
				size->height = GB(this->GetWidget<NWidgetCore>(widget)->widget_data, MAT_ROW_START, MAT_ROW_BITS) * this->line_height;
				break;

			case GRFPAR_WIDGET_DESCRIPTION:
				size->height = max<uint>(size->height, FONT_HEIGHT_NORMAL * 4 + WD_TEXTPANEL_TOP + WD_TEXTPANEL_BOTTOM);
				break;
		}
	}

	virtual void SetStringParameters(int widget) const
	{
		switch (widget) {
			case GRFPAR_WIDGET_NUMPAR:
				SetDParam(0, this->vscroll->GetCount());
				break;
		}
	}

	virtual void DrawWidget(const Rect &r, int widget) const
	{
		if (widget == GRFPAR_WIDGET_DESCRIPTION) {
			const GRFParameterInfo *par_info = (this->clicked_row < this->grf_config->param_info.Length()) ? this->grf_config->param_info[this->clicked_row] : NULL;
			if (par_info == NULL) return;
			const char *desc = GetGRFStringFromGRFText(par_info->desc);
			if (desc == NULL) return;
			DrawStringMultiLine(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, r.top + WD_TEXTPANEL_TOP, r.bottom - WD_TEXTPANEL_BOTTOM, desc, TC_BLACK);
			return;
		} else if (widget != GRFPAR_WIDGET_BACKGROUND) {
			return;
		}

		bool rtl = _current_text_dir == TD_RTL;
		uint buttons_left = rtl ? r.right - 23 : r.left + 4;
		uint text_left    = r.left + (rtl ? WD_FRAMERECT_LEFT : 28);
		uint text_right   = r.right - (rtl ? 28 : WD_FRAMERECT_RIGHT);

		int y = r.top;
		for (uint i = this->vscroll->GetPosition(); this->vscroll->IsVisible(i) && i < this->vscroll->GetCount(); i++) {
			GRFParameterInfo *par_info = (i < this->grf_config->param_info.Length()) ? this->grf_config->param_info[i] : NULL;
			if (par_info == NULL) par_info = GetDummyParameterInfo(i);
			uint32 current_value = par_info->GetValue(this->grf_config);
			bool selected = (i == this->clicked_row);

			if (par_info->type == PTYPE_BOOL) {
				DrawFrameRect(buttons_left, y  + 2, buttons_left + 19, y + 10, (current_value != 0) ? COLOUR_GREEN : COLOUR_RED, (current_value != 0) ? FR_LOWERED : FR_NONE);
				SetDParam(2, par_info->GetValue(this->grf_config) == 0 ? STR_CONFIG_SETTING_OFF : STR_CONFIG_SETTING_ON);
			} else if (par_info->type == PTYPE_UINT_ENUM) {
				DrawArrowButtons(buttons_left, y + 2, COLOUR_YELLOW, (this->clicked_button == i) ? 1 + (this->clicked_increase != rtl) : 0, current_value > par_info->min_value, current_value < par_info->max_value);
				SetDParam(2, STR_JUST_INT);
				SetDParam(3, current_value);
				if (par_info->value_names.Contains(current_value)) {
					const char *label = GetGRFStringFromGRFText(par_info->value_names.Find(current_value)->second);
					if (label != NULL) {
						SetDParam(2, STR_JUST_RAW_STRING);
						SetDParamStr(3, label);
					}
				}
			}

			const char *name = GetGRFStringFromGRFText(par_info->name);
			if (name != NULL) {
				SetDParam(0, STR_JUST_RAW_STRING);
				SetDParamStr(1, name);
			} else {
				SetDParam(0, STR_NEWGRF_PARAMETERS_DEFAULT_NAME);
				SetDParam(1, i + 1);
			}

			DrawString(text_left, text_right, y + WD_MATRIX_TOP, STR_NEWGRF_PARAMETERS_SETTING, selected ? TC_WHITE : TC_LIGHT_BLUE);
			y += this->line_height;
		}
	}

	virtual void OnClick(Point pt, int widget, int click_count)
	{
		switch (widget) {
			case GRFPAR_WIDGET_NUMPAR_DEC:
				if (!this->action14present && this->grf_config->num_params > 0) {
					this->grf_config->num_params--;
					this->InvalidateData();
					SetWindowClassesDirty(WC_GAME_OPTIONS); // Is always the newgrf window
				}
				break;

			case GRFPAR_WIDGET_NUMPAR_INC: {
				GRFConfig *c = this->grf_config;
				if (!this->action14present && c->num_params < c->num_valid_params) {
					c->param[c->num_params++] = 0;
					this->InvalidateData();
					SetWindowClassesDirty(WC_GAME_OPTIONS); // Is always the newgrf window
				}
				break;
			}

			case GRFPAR_WIDGET_BACKGROUND: {
				uint num = this->vscroll->GetScrolledRowFromWidget(pt.y, this, GRFPAR_WIDGET_BACKGROUND);
				if (num >= this->vscroll->GetCount()) break;
				if (this->clicked_row != num) {
					DeleteChildWindows(WC_QUERY_STRING);
					this->clicked_row = num;
				}

				const NWidgetBase *wid = this->GetWidget<NWidgetBase>(GRFPAR_WIDGET_BACKGROUND);
				int x = pt.x - wid->pos_x;
				if (_current_text_dir == TD_RTL) x = wid->current_x - x;
				x -= 4;

				GRFParameterInfo *par_info = (num < this->grf_config->param_info.Length()) ? this->grf_config->param_info[num] : NULL;
				if (par_info == NULL) par_info = GetDummyParameterInfo(num);

				/* One of the arrows is clicked */
				if (IsInsideMM(x, 0, 21)) {
					uint32 val = par_info->GetValue(this->grf_config);
					uint32 old_val = val;
					if (par_info->type == PTYPE_BOOL) {
						val = !val;
					} else {
						if (x >= 10) {
							/* Increase button clicked */
							if (val < par_info->max_value) val++;
							this->clicked_increase = true;
						} else {
							/* Decrease button clicked */
							if (val > par_info->min_value) val--;
							this->clicked_increase = false;
						}
					}
					if (val != old_val) {
						par_info->SetValue(this->grf_config, val);

						this->clicked_button = num;
						this->timeout = 5;
						this->SetDirty();
					}
				} else if (par_info->type == PTYPE_UINT_ENUM && click_count >= 2) {
					/* Display a query box so users can enter a custom value. */
					SetDParam(0, this->grf_config->param[num]);
					ShowQueryString(STR_JUST_INT, STR_CONFIG_SETTING_QUERY_CAPTION, 10, this, CS_NUMERAL, QSF_NONE);
				}
				break;
			}

			case GRFPAR_WIDGET_RESET:
				this->grf_config->SetParameterDefaults();
				this->InvalidateData();
				SetWindowClassesDirty(WC_GAME_OPTIONS); // Is always the newgrf window
				break;

			case GRFPAR_WIDGET_ACCEPT:
				delete this;
				break;
		}
	}

	virtual void OnQueryTextFinished(char *str)
	{
		if (StrEmpty(str)) return;
		int32 value = atoi(str);
		GRFParameterInfo *par_info = ((uint)this->clicked_row < this->grf_config->param_info.Length()) ? this->grf_config->param_info[this->clicked_row] : NULL;
		if (par_info == NULL) par_info = GetDummyParameterInfo(this->clicked_row);
		uint32 val = Clamp<uint32>(value, par_info->min_value, par_info->max_value);
		par_info->SetValue(this->grf_config, val);
		this->SetDirty();
	}

	virtual void OnResize()
	{
		NWidgetCore *nwi = this->GetWidget<NWidgetCore>(GRFPAR_WIDGET_BACKGROUND);
		this->vscroll->SetCapacity(nwi->current_y / this->line_height);
		nwi->widget_data = (this->vscroll->GetCapacity() << MAT_ROW_START) + (1 << MAT_COL_START);
	}

	/**
	 * Some data on this window has become invalid.
	 * @param data Information about the changed data.
	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
	 */
	virtual void OnInvalidateData(int data = 0, bool gui_scope = true)
	{
		if (!gui_scope) return;
		if (!this->action14present) {
			this->SetWidgetDisabledState(GRFPAR_WIDGET_NUMPAR_DEC, this->grf_config->num_params == 0);
			this->SetWidgetDisabledState(GRFPAR_WIDGET_NUMPAR_INC, this->grf_config->num_params >= this->grf_config->num_valid_params);
		}

		this->vscroll->SetCount(this->action14present ? this->grf_config->num_valid_params : this->grf_config->num_params);
		if (this->clicked_row != UINT_MAX && this->clicked_row >= this->vscroll->GetCount()) {
			this->clicked_row = UINT_MAX;
			DeleteChildWindows(WC_QUERY_STRING);
		}
	}

	virtual void OnTick()
	{
		if (--this->timeout == 0) {
			this->clicked_button = UINT_MAX;
			this->SetDirty();
		}
	}
};
GRFParameterInfo NewGRFParametersWindow::dummy_parameter_info(0);


static const NWidgetPart _nested_newgrf_parameter_widgets[] = {
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_CLOSEBOX, COLOUR_MAUVE),
		NWidget(WWT_CAPTION, COLOUR_MAUVE), SetDataTip(STR_NEWGRF_PARAMETERS_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
	EndContainer(),
	NWidget(NWID_SELECTION, INVALID_COLOUR, GRFPAR_WIDGET_SHOW_NUMPAR),
		NWidget(WWT_PANEL, COLOUR_MAUVE), SetResize(1, 0), SetFill(1, 0), SetPIP(4, 0, 4),
			NWidget(NWID_HORIZONTAL), SetPIP(4, 0, 4),
				NWidget(WWT_PUSHARROWBTN, COLOUR_YELLOW, GRFPAR_WIDGET_NUMPAR_DEC), SetMinimalSize(12, 12), SetDataTip(AWV_DECREASE, STR_NULL),
				NWidget(WWT_PUSHARROWBTN, COLOUR_YELLOW, GRFPAR_WIDGET_NUMPAR_INC), SetMinimalSize(12, 12), SetDataTip(AWV_INCREASE, STR_NULL),
				NWidget(WWT_TEXT, COLOUR_MAUVE, GRFPAR_WIDGET_NUMPAR), SetResize(1, 0), SetFill(1, 0), SetPadding(0, 0, 0, 4), SetDataTip(STR_NEWGRF_PARAMETERS_NUM_PARAM, STR_NULL),
			EndContainer(),
		EndContainer(),
	EndContainer(),
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_MATRIX, COLOUR_MAUVE, GRFPAR_WIDGET_BACKGROUND), SetMinimalSize(188, 182), SetResize(1, 1), SetFill(1, 0), SetDataTip(0x501, STR_NULL), SetScrollbar(GRFPAR_WIDGET_SCROLLBAR),
		NWidget(NWID_VSCROLLBAR, COLOUR_MAUVE, GRFPAR_WIDGET_SCROLLBAR),
	EndContainer(),
	NWidget(NWID_SELECTION, INVALID_COLOUR, GRFPAR_WIDGET_SHOW_DESCRIPTION),
		NWidget(WWT_PANEL, COLOUR_MAUVE, GRFPAR_WIDGET_DESCRIPTION), SetResize(1, 0), SetFill(1, 0),
		EndContainer(),
	EndContainer(),
	NWidget(NWID_HORIZONTAL),
		NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
			NWidget(WWT_PUSHTXTBTN, COLOUR_MAUVE, GRFPAR_WIDGET_ACCEPT), SetResize(1, 0), SetFill(1, 0), SetDataTip(STR_NEWGRF_PARAMETERS_CLOSE, STR_NULL),
			NWidget(WWT_PUSHTXTBTN, COLOUR_MAUVE, GRFPAR_WIDGET_RESET), SetResize(1, 0), SetFill(1, 0), SetDataTip(STR_NEWGRF_PARAMETERS_RESET, STR_NEWGRF_PARAMETERS_RESET_TOOLTIP),
		EndContainer(),
		NWidget(WWT_RESIZEBOX, COLOUR_MAUVE),
	EndContainer(),
};

/* Window definition for the change grf parameters window */
static const WindowDesc _newgrf_parameters_desc(
	WDP_CENTER, 500, 208,
	WC_GRF_PARAMETERS, WC_NONE,
	WDF_UNCLICK_BUTTONS,
	_nested_newgrf_parameter_widgets, lengthof(_nested_newgrf_parameter_widgets)
);

void OpenGRFParameterWindow(GRFConfig *c)
{
	DeleteWindowByClass(WC_GRF_PARAMETERS);
	new NewGRFParametersWindow(&_newgrf_parameters_desc, c);
}

static GRFPresetList _grf_preset_list;

class DropDownListPresetItem : public DropDownListItem {
public:
	DropDownListPresetItem(int result) : DropDownListItem(result, false) {}

	virtual ~DropDownListPresetItem() {}

	bool Selectable() const
	{
		return true;
	}

	void Draw(int left, int right, int top, int bottom, bool sel, int bg_colour) const
	{
		DrawString(left + 2, right + 2, top, _grf_preset_list[this->result], sel ? TC_WHITE : TC_BLACK);
	}
};

static void NewGRFConfirmationCallback(Window *w, bool confirmed);

/** Names of the manage newgrfs window widgets. */
enum ShowNewGRFStateWidgets {
	SNGRFS_PRESET_LIST,
	SNGRFS_PRESET_SAVE,
	SNGRFS_PRESET_DELETE,
	SNGRFS_ADD,
	SNGRFS_REMOVE,
	SNGRFS_MOVE_UP,
	SNGRFS_MOVE_DOWN,
	SNGRFS_FILTER,
	SNGRFS_FILE_LIST,
	SNGRFS_SCROLLBAR,
	SNGRFS_AVAIL_LIST,
	SNGRFS_SCROLL2BAR,
	SNGRFS_NEWGRF_INFO_TITLE,
	SNGRFS_NEWGRF_INFO,
	SNGRFS_SET_PARAMETERS,
	SNGRFS_TOGGLE_PALETTE,
	SNGRFS_APPLY_CHANGES,
	SNGRFS_RESCAN_FILES,
	SNGRFS_RESCAN_FILES2,
	SNGRFS_CONTENT_DOWNLOAD,
	SNGRFS_CONTENT_DOWNLOAD2,
	SNGRFS_SHOW_REMOVE, ///< Select active list buttons (0 = normal, 1 = simple layout).
	SNGRFS_SHOW_APPLY,  ///< Select display of the buttons below the 'details'.
};

/**
 * Window for showing NewGRF files
 */
struct NewGRFWindow : public QueryStringBaseWindow {
	typedef GUIList<const GRFConfig *> GUIGRFConfigList;

	static const uint EDITBOX_MAX_SIZE   =  50;

	static Listing   last_sorting;   ///< Default sorting of #GUIGRFConfigList.
	static Filtering last_filtering; ///< Default filtering of #GUIGRFConfigList.
	static GUIGRFConfigList::SortFunction   * const sorter_funcs[]; ///< Sort functions of the #GUIGRFConfigList.
	static GUIGRFConfigList::FilterFunction * const filter_funcs[]; ///< Filter functions of the #GUIGRFConfigList.

	GUIGRFConfigList avails;    ///< Available (non-active) grfs.
	const GRFConfig *avail_sel; ///< Currently selected available grf. \c NULL is none is selected.
	int avail_pos;              ///< Index of #avail_sel if existing, else \c -1.

	GRFConfig *actives;         ///< Temporary active grf list to which changes are made.
	GRFConfig *active_sel;      ///< Selected active grf item.

	GRFConfig **orig_list;      ///< List active grfs in the game. Used as initial value, may be updated by the window.
	bool editable;              ///< Is the window editable?
	bool show_params;           ///< Are the grf-parameters shown in the info-panel?
	bool execute;               ///< On pressing 'apply changes' are grf changes applied immediately, or only list is updated.
	int preset;                 ///< Selected preset.

	Scrollbar *vscroll;
	Scrollbar *vscroll2;

	NewGRFWindow(const WindowDesc *desc, bool editable, bool show_params, bool execute, GRFConfig **orig_list) : QueryStringBaseWindow(EDITBOX_MAX_SIZE)
	{
		this->avail_sel   = NULL;
		this->avail_pos   = -1;
		this->active_sel  = NULL;
		this->actives     = NULL;
		this->orig_list   = orig_list;
		this->editable    = editable;
		this->execute     = execute;
		this->show_params = show_params;
		this->preset      = -1;

		CopyGRFConfigList(&this->actives, *orig_list, false);
		GetGRFPresetList(&_grf_preset_list);

		this->CreateNestedTree(desc);
		this->vscroll = this->GetScrollbar(SNGRFS_SCROLLBAR);
		this->vscroll2 = this->GetScrollbar(SNGRFS_SCROLL2BAR);

		this->GetWidget<NWidgetStacked>(SNGRFS_SHOW_REMOVE)->SetDisplayedPlane(this->editable ? 0 : 1);
		this->GetWidget<NWidgetStacked>(SNGRFS_SHOW_APPLY)->SetDisplayedPlane(this->editable ? 0 : SZSP_HORIZONTAL);
		this->FinishInitNested(desc);

		InitializeTextBuffer(&this->text, this->edit_str_buf, this->edit_str_size);
		this->SetFocusedWidget(SNGRFS_FILTER);

		this->avails.SetListing(this->last_sorting);
		this->avails.SetFiltering(this->last_filtering);
		this->avails.SetSortFuncs(this->sorter_funcs);
		this->avails.SetFilterFuncs(this->filter_funcs);
		this->avails.ForceRebuild();

		this->OnInvalidateData(2);
	}

	~NewGRFWindow()
	{
		DeleteWindowByClass(WC_GRF_PARAMETERS);

		if (this->editable && !this->execute) {
			CopyGRFConfigList(this->orig_list, this->actives, true);
			ResetGRFConfig(false);
			ReloadNewGRFData();
		}

		/* Remove the temporary copy of grf-list used in window */
		ClearGRFConfigList(&this->actives);
		_grf_preset_list.Clear();
	}

	virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
	{
		switch (widget) {
			case SNGRFS_FILE_LIST:
				resize->height = max(12, FONT_HEIGHT_NORMAL + 2);
				size->height = max(size->height, WD_FRAMERECT_TOP + 6 * resize->height + WD_FRAMERECT_BOTTOM);
				break;

			case SNGRFS_AVAIL_LIST:
				resize->height = max(12, FONT_HEIGHT_NORMAL + 2);
				size->height = max(size->height, WD_FRAMERECT_TOP + 8 * resize->height + WD_FRAMERECT_BOTTOM);
				break;

			case SNGRFS_NEWGRF_INFO_TITLE: {
				Dimension dim = GetStringBoundingBox(STR_NEWGRF_SETTINGS_INFO_TITLE);
				size->height = max(size->height, dim.height + WD_FRAMETEXT_TOP + WD_FRAMETEXT_BOTTOM);
				size->width  = max(size->width,  dim.width  + WD_FRAMETEXT_LEFT + WD_FRAMETEXT_RIGHT);
				break;
			}

			case SNGRFS_NEWGRF_INFO:
				size->height = max(size->height, WD_FRAMERECT_TOP + 10 * FONT_HEIGHT_NORMAL + WD_FRAMERECT_BOTTOM + padding.height + 2);
				break;

			case SNGRFS_PRESET_LIST: {
				Dimension d = GetStringBoundingBox(STR_NUM_CUSTOM);
				for (uint i = 0; i < _grf_preset_list.Length(); i++) {
					if (_grf_preset_list[i] != NULL) {
						SetDParamStr(0, _grf_preset_list[i]);
						d = maxdim(d, GetStringBoundingBox(STR_JUST_RAW_STRING));
					}
				}
				d.width += padding.width;
				*size = maxdim(d, *size);
				break;
			}

			case SNGRFS_CONTENT_DOWNLOAD:
			case SNGRFS_CONTENT_DOWNLOAD2: {
				Dimension d = GetStringBoundingBox(STR_NEWGRF_SETTINGS_FIND_MISSING_CONTENT_BUTTON);
				*size = maxdim(d, GetStringBoundingBox(STR_INTRO_ONLINE_CONTENT));
				size->width  += padding.width;
				size->height += padding.height;
				break;
			}
		}
	}

	virtual void OnResize()
	{
		this->vscroll->SetCapacityFromWidget(this, SNGRFS_FILE_LIST);
		this->vscroll2->SetCapacityFromWidget(this, SNGRFS_AVAIL_LIST);
	}

	virtual void SetStringParameters(int widget) const
	{
		switch (widget) {
			case SNGRFS_PRESET_LIST:
				if (this->preset == -1) {
					SetDParam(0, STR_NUM_CUSTOM);
				} else {
					SetDParam(0, STR_JUST_RAW_STRING);
					SetDParamStr(1, _grf_preset_list[this->preset]);
				}
				break;
		}
	}

	virtual void OnPaint()
	{
		this->DrawWidgets();
		if (this->editable) this->DrawEditBox(SNGRFS_FILTER);
	}

	/**
	 * Pick the palette for the sprite of the grf to display.
	 * @param c grf to display.
	 * @return Palette for the sprite.
	 */
	FORCEINLINE PaletteID GetPalette(const GRFConfig *c) const
	{
		PaletteID pal;

		/* Pick a colour */
		switch (c->status) {
			case GCS_NOT_FOUND:
			case GCS_DISABLED:
				pal = PALETTE_TO_RED;
				break;
			case GCS_ACTIVATED:
				pal = PALETTE_TO_GREEN;
				break;
			default:
				pal = PALETTE_TO_BLUE;
				break;
		}

		/* Do not show a "not-failure" colour when it actually failed to load */
		if (pal != PALETTE_TO_RED) {
			if (HasBit(c->flags, GCF_STATIC)) {
				pal = PALETTE_TO_GREY;
			} else if (HasBit(c->flags, GCF_COMPATIBLE)) {
				pal = PALETTE_TO_ORANGE;
			}
		}

		return pal;
	}

	virtual void DrawWidget(const Rect &r, int widget) const
	{
		switch (widget) {
			case SNGRFS_FILE_LIST: {
				GfxFillRect(r.left + 1, r.top + 1, r.right - 1, r.bottom - 1, PC_BLACK);

				uint step_height = this->GetWidget<NWidgetBase>(SNGRFS_FILE_LIST)->resize_y;
				uint y = r.top + WD_FRAMERECT_TOP;
				int sprite_offset_y = (step_height - 10) / 2;
				int offset_y = (step_height - FONT_HEIGHT_NORMAL) / 2;

				bool rtl = _current_text_dir == TD_RTL;
				uint text_left    = rtl ? r.left + WD_FRAMERECT_LEFT : r.left + 25;
				uint text_right   = rtl ? r.right - 25 : r.right - WD_FRAMERECT_RIGHT;
				uint square_left  = rtl ? r.right - 15 : r.left + 5;
				uint warning_left = rtl ? r.right - 30 : r.left + 20;

				int i = 0;
				for (const GRFConfig *c = this->actives; c != NULL; c = c->next, i++) {
					if (this->vscroll->IsVisible(i)) {
						const char *text = c->GetName();
						bool h = (this->active_sel == c);
						PaletteID pal = this->GetPalette(c);

						if (h) GfxFillRect(r.left + 1, y, r.right - 1, y + step_height - 1, PC_DARK_BLUE);
						DrawSprite(SPR_SQUARE, pal, square_left, y + sprite_offset_y);
						if (c->error != NULL) DrawSprite(SPR_WARNING_SIGN, 0, warning_left, y + sprite_offset_y);
						uint txtoffset = c->error == NULL ? 0 : 10;
						DrawString(text_left + (rtl ? 0 : txtoffset), text_right - (rtl ? txtoffset : 0), y + offset_y, text, h ? TC_WHITE : TC_ORANGE);
						y += step_height;
					}
				}
				break;
			}

			case SNGRFS_AVAIL_LIST: {
				GfxFillRect(r.left + 1, r.top + 1, r.right - 1, r.bottom - 1, PC_BLACK);

				uint step_height = this->GetWidget<NWidgetBase>(SNGRFS_AVAIL_LIST)->resize_y;
				int offset_y = (step_height - FONT_HEIGHT_NORMAL) / 2;
				uint y = r.top + WD_FRAMERECT_TOP;
				uint min_index = this->vscroll2->GetPosition();
				uint max_index = min(min_index + this->vscroll2->GetCapacity(), this->avails.Length());

				for (uint i = min_index; i < max_index; i++) {
					const GRFConfig *c = this->avails[i];
					bool h = (c == this->avail_sel);
					const char *text = c->GetName();

					if (h) GfxFillRect(r.left + 1, y, r.right - 1, y + step_height - 1, PC_DARK_BLUE);
					DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y + offset_y, text, h ? TC_WHITE : TC_SILVER);
					y += step_height;
				}
				break;
			}

			case SNGRFS_NEWGRF_INFO_TITLE:
				/* Create the nice grayish rectangle at the details top. */
				GfxFillRect(r.left + 1, r.top + 1, r.right - 1, r.bottom - 1, PC_DARK_BLUE);
				DrawString(r.left, r.right, (r.top + r.bottom - FONT_HEIGHT_NORMAL) / 2, STR_NEWGRF_SETTINGS_INFO_TITLE, TC_FROMSTRING, SA_HOR_CENTER);
				break;

			case SNGRFS_NEWGRF_INFO: {
				const GRFConfig *selected = this->active_sel;
				if (selected == NULL) selected = this->avail_sel;
				if (selected != NULL) {
					ShowNewGRFInfo(selected, r.left + WD_FRAMERECT_LEFT, r.top + WD_FRAMERECT_TOP, r.right - WD_FRAMERECT_RIGHT, r.bottom - WD_FRAMERECT_BOTTOM, this->show_params);
				}
				break;
			}
		}
	}

	virtual void OnClick(Point pt, int widget, int click_count)
	{
		switch (widget) {
			case SNGRFS_PRESET_LIST: {
				DropDownList *list = new DropDownList();

				/* Add 'None' option for clearing list */
				list->push_back(new DropDownListStringItem(STR_NONE, -1, false));

				for (uint i = 0; i < _grf_preset_list.Length(); i++) {
					if (_grf_preset_list[i] != NULL) {
						list->push_back(new DropDownListPresetItem(i));
					}
				}

				this->DeleteChildWindows(WC_QUERY_STRING); // Remove the parameter query window
				ShowDropDownList(this, list, this->preset, SNGRFS_PRESET_LIST);
				break;
			}

			case SNGRFS_PRESET_SAVE:
				ShowQueryString(STR_EMPTY, STR_NEWGRF_SETTINGS_PRESET_SAVE_QUERY, 32, this, CS_ALPHANUMERAL, QSF_NONE);
				break;

			case SNGRFS_PRESET_DELETE:
				if (this->preset == -1) return;

				DeleteGRFPresetFromConfig(_grf_preset_list[this->preset]);
				GetGRFPresetList(&_grf_preset_list);
				this->preset = -1;
				this->InvalidateData();
				this->DeleteChildWindows(WC_QUERY_STRING); // Remove the parameter query window
				break;

			case SNGRFS_MOVE_UP: { // Move GRF up
				if (this->active_sel == NULL || !this->editable) break;

				int pos = 0;
				for (GRFConfig **pc = &this->actives; *pc != NULL; pc = &(*pc)->next, pos++) {
					GRFConfig *c = *pc;
					if (c->next == this->active_sel) {
						c->next = this->active_sel->next;
						this->active_sel->next = c;
						*pc = this->active_sel;
						break;
					}
				}
				this->vscroll->ScrollTowards(pos);
				this->preset = -1;
				this->InvalidateData();
				break;
			}

			case SNGRFS_MOVE_DOWN: { // Move GRF down
				if (this->active_sel == NULL || !this->editable) break;

				int pos = 1; // Start at 1 as we swap the selected newgrf with the next one
				for (GRFConfig **pc = &this->actives; *pc != NULL; pc = &(*pc)->next, pos++) {
					GRFConfig *c = *pc;
					if (c == this->active_sel) {
						*pc = c->next;
						c->next = c->next->next;
						(*pc)->next = c;
						break;
					}
				}
				this->vscroll->ScrollTowards(pos);
				this->preset = -1;
				this->InvalidateData();
				break;
			}

			case SNGRFS_FILE_LIST: { // Select an active GRF.
				uint i = this->vscroll->GetScrolledRowFromWidget(pt.y, this, SNGRFS_FILE_LIST);

				GRFConfig *c;
				for (c = this->actives; c != NULL && i > 0; c = c->next, i--) {}

				if (this->active_sel != c) DeleteWindowByClass(WC_GRF_PARAMETERS);
				this->active_sel = c;
				this->avail_sel = NULL;
				this->avail_pos = -1;

				this->InvalidateData();
				if (click_count == 1) break;
				/* FALL THROUGH, with double click. */
			}

			case SNGRFS_REMOVE: { // Remove GRF
				if (this->active_sel == NULL || !this->editable) break;
				DeleteWindowByClass(WC_GRF_PARAMETERS);

				/* Choose the next GRF file to be the selected file. */
				GRFConfig *newsel = this->active_sel->next;
				for (GRFConfig **pc = &this->actives; *pc != NULL; pc = &(*pc)->next) {
					GRFConfig *c = *pc;
					/* If the new selection is empty (i.e. we're deleting the last item
					 * in the list, pick the file just before the selected file */
					if (newsel == NULL && c->next == this->active_sel) newsel = c;

					if (c == this->active_sel) {
						*pc = c->next;
						delete c;
						break;
					}
				}

				this->active_sel = newsel;
				this->preset = -1;
				this->avail_pos = -1;
				this->avail_sel = NULL;
				this->avails.ForceRebuild();
				this->InvalidateData(2);
				break;
			}

			case SNGRFS_AVAIL_LIST: { // Select a non-active GRF.
				uint i = this->vscroll2->GetScrolledRowFromWidget(pt.y, this, SNGRFS_AVAIL_LIST);
				this->active_sel = NULL;
				DeleteWindowByClass(WC_GRF_PARAMETERS);
				if (i < this->avails.Length()) {
					this->avail_sel = this->avails[i];
					this->avail_pos = i;
				}
				this->InvalidateData();
				if (click_count == 1) break;
				/* FALL THROUGH, with double click. */
			}

			case SNGRFS_ADD: {
				if (this->avail_sel == NULL || !this->editable || HasBit(this->avail_sel->flags, GCF_INVALID)) break;

				GRFConfig **list;
				/* Find last entry in the list, checking for duplicate grfid on the way */
				for (list = &this->actives; *list != NULL; list = &(*list)->next) {
					if ((*list)->ident.grfid == this->avail_sel->ident.grfid) {
						ShowErrorMessage(STR_NEWGRF_DUPLICATE_GRFID, INVALID_STRING_ID, WL_INFO);
						return;
					}
				}

				GRFConfig *c = new GRFConfig(*this->avail_sel); // Copy GRF details from scanned list.
				c->SetParameterDefaults();
				*list = c; // Append GRF config to configuration list.

				/* Select next (or previous, if last one) item in the list. */
				int new_pos = this->avail_pos + 1;
				if (new_pos >= (int)this->avails.Length()) new_pos = this->avail_pos - 1;
				this->avail_pos = new_pos;
				if (new_pos >= 0) this->avail_sel = this->avails[new_pos];

				this->avails.ForceRebuild();
				this->InvalidateData(2);
				break;
			}

			case SNGRFS_APPLY_CHANGES: // Apply changes made to GRF list
				if (!this->editable) break;
				if (this->execute) {
					ShowQuery(
						STR_NEWGRF_POPUP_CAUTION_CAPTION,
						STR_NEWGRF_CONFIRMATION_TEXT,
						this,
						NewGRFConfirmationCallback
					);
				} else {
					CopyGRFConfigList(this->orig_list, this->actives, true);
					ResetGRFConfig(false);
					ReloadNewGRFData();
				}
				this->DeleteChildWindows(WC_QUERY_STRING); // Remove the parameter query window
				break;

			case SNGRFS_SET_PARAMETERS: { // Edit parameters
				if (this->active_sel == NULL || !this->editable || !this->show_params) break;

				OpenGRFParameterWindow(this->active_sel);
				break;
			}

			case SNGRFS_TOGGLE_PALETTE:
				if (this->active_sel != NULL || !this->editable) {
					this->active_sel->palette ^= GRFP_USE_MASK;
					this->SetDirty();
				}
				break;

			case SNGRFS_CONTENT_DOWNLOAD:
			case SNGRFS_CONTENT_DOWNLOAD2:
				if (!_network_available) {
					ShowErrorMessage(STR_NETWORK_ERROR_NOTAVAILABLE, INVALID_STRING_ID, WL_ERROR);
				} else {
#if defined(ENABLE_NETWORK)
					this->DeleteChildWindows(WC_QUERY_STRING); // Remove the parameter query window

					/* Only show the things in the current list, or everything when nothing's selected */
					ContentVector cv;
					for (const GRFConfig *c = this->actives; c != NULL; c = c->next) {
						if (c->status != GCS_NOT_FOUND && !HasBit(c->flags, GCF_COMPATIBLE)) continue;

						ContentInfo *ci = new ContentInfo();
						ci->type = CONTENT_TYPE_NEWGRF;
						ci->state = ContentInfo::DOES_NOT_EXIST;
						ttd_strlcpy(ci->name, c->GetName(), lengthof(ci->name));
						ci->unique_id = BSWAP32(c->ident.grfid);
						memcpy(ci->md5sum, HasBit(c->flags, GCF_COMPATIBLE) ? c->original_md5sum : c->ident.md5sum, sizeof(ci->md5sum));
						*cv.Append() = ci;
					}
					ShowNetworkContentListWindow(cv.Length() == 0 ? NULL : &cv, CONTENT_TYPE_NEWGRF);
#endif
				}
				break;

			case SNGRFS_RESCAN_FILES:
			case SNGRFS_RESCAN_FILES2:
				TarScanner::DoScan();
				ScanNewGRFFiles();
				this->avail_sel = NULL;
				this->avail_pos = -1;
				this->avails.ForceRebuild();
				this->InvalidateData(1);
				this->DeleteChildWindows(WC_QUERY_STRING); // Remove the parameter query window
				InvalidateWindowClassesData(WC_SAVELOAD);
				break;
		}
	}

	virtual void OnDropdownSelect(int widget, int index)
	{
		if (!this->editable) return;

		ClearGRFConfigList(&this->actives);
		this->preset = index;

		if (index != -1) {
			GRFConfig *c = LoadGRFPresetFromConfig(_grf_preset_list[index]);

			this->active_sel = NULL;
			this->actives = c;
			this->avails.ForceRebuild();
		}

		DeleteWindowByClass(WC_GRF_PARAMETERS);
		this->active_sel = NULL;
		this->InvalidateData(3);
	}

	virtual void OnQueryTextFinished(char *str)
	{
		if (str == NULL) return;

		SaveGRFPresetToConfig(str, this->actives);
		GetGRFPresetList(&_grf_preset_list);

		/* Switch to this preset */
		for (uint i = 0; i < _grf_preset_list.Length(); i++) {
			if (_grf_preset_list[i] != NULL && strcmp(_grf_preset_list[i], str) == 0) {
				this->preset = i;
				break;
			}
		}

		this->InvalidateData();
	}

	/**
	 * Some data on this window has become invalid.
	 * @param data Information about the changed data.
	 *  - 0: (optionally) build availables, update button status.
	 *  - 1: build availables, Add newly found grfs, update button status.
	 *  - 2: (optionally) build availables, Reset preset, + 3
	 *  - 3: (optionally) build availables, Update active scrollbar, update button status.
	 *  - 4: Force a rebuild of the availables, + 2
	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
	 */
	virtual void OnInvalidateData(int data = 0, bool gui_scope = true)
	{
		if (!gui_scope) return;
		switch (data) {
			default: NOT_REACHED();
			case 0:
				/* Nothing important to do */
				break;

			case 1:
				/* Search the list for items that are now found and mark them as such. */
				for (GRFConfig **l = &this->actives; *l != NULL; l = &(*l)->next) {
					GRFConfig *c = *l;
					bool compatible = HasBit(c->flags, GCF_COMPATIBLE);
					if (c->status != GCS_NOT_FOUND && !compatible) continue;

					const GRFConfig *f = FindGRFConfig(c->ident.grfid, FGCM_EXACT, compatible ? c->original_md5sum : c->ident.md5sum);
					if (f == NULL || HasBit(f->flags, GCF_INVALID)) continue;

					*l = new GRFConfig(*f);
					(*l)->next = c->next;

					if (active_sel == c) active_sel = *l;

					delete c;
				}
				/* FALL THROUGH */
			case 4:
				this->avails.ForceRebuild();
				/* FALL THROUGH */
			case 2:
				this->preset = -1;
				/* FALL THROUGH */
			case 3: {
				int i = 0;
				for (const GRFConfig *c = this->actives; c != NULL; c = c->next, i++) {}

				this->vscroll->SetCapacityFromWidget(this, SNGRFS_FILE_LIST);
				this->vscroll->SetCount(i);

				this->vscroll2->SetCapacityFromWidget(this, SNGRFS_AVAIL_LIST);
				if (this->avail_pos >= 0) this->vscroll2->ScrollTowards(this->avail_pos);
				break;
			}
		}

		this->BuildAvailables();

		this->SetWidgetsDisabledState(!this->editable,
			SNGRFS_PRESET_LIST,
			SNGRFS_APPLY_CHANGES,
			SNGRFS_TOGGLE_PALETTE,
			WIDGET_LIST_END
		);
		this->SetWidgetDisabledState(SNGRFS_ADD, !this->editable || this->avail_sel == NULL || HasBit(this->avail_sel->flags, GCF_INVALID));

		bool disable_all = this->active_sel == NULL || !this->editable;
		this->SetWidgetsDisabledState(disable_all,
			SNGRFS_REMOVE,
			SNGRFS_MOVE_UP,
			SNGRFS_MOVE_DOWN,
			WIDGET_LIST_END
		);
		this->SetWidgetDisabledState(SNGRFS_SET_PARAMETERS, !this->show_params || disable_all);
		this->SetWidgetDisabledState(SNGRFS_TOGGLE_PALETTE, disable_all);

		if (!disable_all) {
			/* All widgets are now enabled, so disable widgets we can't use */
			if (this->active_sel == this->actives)    this->DisableWidget(SNGRFS_MOVE_UP);
			if (this->active_sel->next == NULL)       this->DisableWidget(SNGRFS_MOVE_DOWN);
			if (this->active_sel->IsOpenTTDBaseGRF()) this->DisableWidget(SNGRFS_REMOVE);
		}

		this->SetWidgetDisabledState(SNGRFS_PRESET_DELETE, this->preset == -1);

		bool has_missing = false;
		bool has_compatible = false;
		for (const GRFConfig *c = this->actives; !has_missing && c != NULL; c = c->next) {
			has_missing    |= c->status == GCS_NOT_FOUND;
			has_compatible |= HasBit(c->flags, GCF_COMPATIBLE);
		}
		uint16 widget_data;
		StringID tool_tip;
		if (has_missing || has_compatible) {
			widget_data = STR_NEWGRF_SETTINGS_FIND_MISSING_CONTENT_BUTTON;
			tool_tip    = STR_NEWGRF_SETTINGS_FIND_MISSING_CONTENT_TOOLTIP;
		} else {
			widget_data = STR_INTRO_ONLINE_CONTENT;
			tool_tip    = STR_INTRO_TOOLTIP_ONLINE_CONTENT;
		}
		this->GetWidget<NWidgetCore>(SNGRFS_CONTENT_DOWNLOAD)->widget_data  = widget_data;
		this->GetWidget<NWidgetCore>(SNGRFS_CONTENT_DOWNLOAD)->tool_tip     = tool_tip;
		this->GetWidget<NWidgetCore>(SNGRFS_CONTENT_DOWNLOAD2)->widget_data = widget_data;
		this->GetWidget<NWidgetCore>(SNGRFS_CONTENT_DOWNLOAD2)->tool_tip    = tool_tip;

		this->SetWidgetDisabledState(SNGRFS_PRESET_SAVE, has_missing);
	}

	virtual void OnMouseLoop()
	{
		if (this->editable) this->HandleEditBox(SNGRFS_FILTER);
	}

	virtual EventState OnKeyPress(uint16 key, uint16 keycode)
	{
		if (!this->editable) return ES_NOT_HANDLED;

		switch (keycode) {
			case WKC_UP:
				/* scroll up by one */
				if (this->avail_pos > 0) this->avail_pos--;
				break;

			case WKC_DOWN:
				/* scroll down by one */
				if (this->avail_pos < (int)this->avails.Length() - 1) this->avail_pos++;
				break;

			case WKC_PAGEUP:
				/* scroll up a page */
				this->avail_pos = (this->avail_pos < this->vscroll2->GetCapacity()) ? 0 : this->avail_pos - this->vscroll2->GetCapacity();
				break;

			case WKC_PAGEDOWN:
				/* scroll down a page */
				this->avail_pos = min(this->avail_pos + this->vscroll2->GetCapacity(), (int)this->avails.Length() - 1);
				break;

			case WKC_HOME:
				/* jump to beginning */
				this->avail_pos = 0;
				break;

			case WKC_END:
				/* jump to end */
				this->avail_pos = this->avails.Length() - 1;
				break;

			default: {
				/* Handle editbox input */
				EventState state = ES_NOT_HANDLED;
				if (this->HandleEditBoxKey(SNGRFS_FILTER, key, keycode, state) == HEBR_EDITING) {
					this->OnOSKInput(SNGRFS_FILTER);
				}
				return state;
			}
		}

		if (this->avails.Length() == 0) this->avail_pos = -1;
		if (this->avail_pos >= 0) {
			this->avail_sel = this->avails[this->avail_pos];
			this->vscroll2->ScrollTowards(this->avail_pos);
			this->InvalidateData(0);
		}

		return ES_HANDLED;
	}

	virtual void OnOSKInput(int wid)
	{
		if (!this->editable) return;

		this->avails.SetFilterState(!StrEmpty(this->edit_str_buf));
		this->avails.ForceRebuild();
		this->InvalidateData(0);
	}

private:
	/** Sort grfs by name. */
	static int CDECL NameSorter(const GRFConfig * const *a, const GRFConfig * const *b)
	{
		int i = strnatcmp((*a)->GetName(), (*b)->GetName()); // Sort by name (natural sorting).
		if (i != 0) return i;

		i = (*a)->version - (*b)->version;
		if (i != 0) return i;

		return memcmp((*a)->ident.md5sum, (*b)->ident.md5sum, lengthof((*b)->ident.md5sum));
	}

	/** Filter grfs by tags/name */
	static bool CDECL TagNameFilter(const GRFConfig * const *a, const char *filter_string)
	{
		if (strcasestr((*a)->GetName(), filter_string) != NULL) return true;
		if ((*a)->filename != NULL && strcasestr((*a)->filename, filter_string) != NULL) return true;
		if ((*a)->GetDescription() != NULL && strcasestr((*a)->GetDescription(), filter_string) != NULL) return true;
		return false;
	}

	void BuildAvailables()
	{
		if (!this->avails.NeedRebuild()) return;

		this->avails.Clear();

		for (const GRFConfig *c = _all_grfs; c != NULL; c = c->next) {
			bool found = false;
			for (const GRFConfig *grf = this->actives; grf != NULL && !found; grf = grf->next) found = grf->ident.HasGrfIdentifier(c->ident.grfid, c->ident.md5sum);
			if (found) continue;

			if (_settings_client.gui.newgrf_show_old_versions) {
				*this->avails.Append() = c;
			} else {
				const GRFConfig *best = FindGRFConfig(c->ident.grfid, HasBit(c->flags, GCF_INVALID) ? FGCM_NEWEST : FGCM_NEWEST_VALID);
				/*
				 * If the best version is 0, then all NewGRF with this GRF ID
				 * have version 0, so for backward compatability reasons we
				 * want to show them all.
				 * If we are the best version, then we definitely want to
				 * show that NewGRF!.
				 */
				if (best->version == 0 || best->ident.HasGrfIdentifier(c->ident.grfid, c->ident.md5sum)) {
					*this->avails.Append() = c;
				}
			}
		}

		this->avails.Filter(this->edit_str_buf);
		this->avails.Compact();
		this->avails.RebuildDone();
		this->avails.Sort();

		if (this->avail_sel != NULL) {
			this->avail_pos = this->avails.FindIndex(this->avail_sel);
			if (this->avail_pos < 0) this->avail_sel = NULL;
		}

		this->vscroll2->SetCount(this->avails.Length()); // Update the scrollbar
	}
};

Listing NewGRFWindow::last_sorting     = {false, 0};
Filtering NewGRFWindow::last_filtering = {false, 0};

NewGRFWindow::GUIGRFConfigList::SortFunction * const NewGRFWindow::sorter_funcs[] = {
	&NameSorter,
};

NewGRFWindow::GUIGRFConfigList::FilterFunction * const NewGRFWindow::filter_funcs[] = {
	&TagNameFilter,
};

/**
 * Custom nested widget container for the NewGRF gui.
 * Depending on the space in the gui, it uses either
 * - two column mode, put the #acs and the #avs underneath each other and the #info next to it, or
 * - three column mode, put the #avs, #acs, and #info each in its own column.
 */
class NWidgetNewGRFDisplay : public NWidgetContainer {
public:
	static const uint INTER_LIST_SPACING;      ///< Empty vertical space between both lists in the 2 column mode.
	static const uint INTER_COLUMN_SPACING;    ///< Empty horizontal space between two columns.
	static const uint MAX_EXTRA_INFO_WIDTH;    ///< Maximal additional width given to the panel.
	static const uint MIN_EXTRA_FOR_3_COLUMNS; ///< Minimal additional width needed before switching to 3 columns.

	NWidgetBase *avs; ///< Widget with the available grfs list and buttons.
	NWidgetBase *acs; ///< Widget with the active grfs list and buttons.
	NWidgetBase *inf; ///< Info panel.
	bool editable;    ///< Editable status of the parent NewGRF window (if \c false, drop all widgets that make the window editable).

	NWidgetNewGRFDisplay(NWidgetBase *avs, NWidgetBase *acs, NWidgetBase *inf) : NWidgetContainer(NWID_HORIZONTAL)
	{
		this->avs = avs;
		this->acs = acs;
		this->inf = inf;

		this->Add(this->avs);
		this->Add(this->acs);
		this->Add(this->inf);

		this->editable = true; // Temporary setting, 'real' value is set in SetupSmallestSize().
	}

	virtual void SetupSmallestSize(Window *w, bool init_array)
	{
		/* Copy state flag from the window. */
		assert(dynamic_cast<NewGRFWindow *>(w) != NULL);
		NewGRFWindow *ngw = (NewGRFWindow *)w;
		this->editable = ngw->editable;

		this->avs->SetupSmallestSize(w, init_array);
		this->acs->SetupSmallestSize(w, init_array);
		this->inf->SetupSmallestSize(w, init_array);

		uint min_avs_width = this->avs->smallest_x + this->avs->padding_left + this->avs->padding_right;
		uint min_acs_width = this->acs->smallest_x + this->acs->padding_left + this->acs->padding_right;
		uint min_inf_width = this->inf->smallest_x + this->inf->padding_left + this->inf->padding_right;

		uint min_avs_height = this->avs->smallest_y + this->avs->padding_top + this->avs->padding_bottom;
		uint min_acs_height = this->acs->smallest_y + this->acs->padding_top + this->acs->padding_bottom;
		uint min_inf_height = this->inf->smallest_y + this->inf->padding_top + this->inf->padding_bottom;

		/* Smallest window is in two column mode. */
		this->smallest_x = max(min_avs_width, min_acs_width) + INTER_COLUMN_SPACING + min_inf_width;
		this->smallest_y = max(min_inf_height, min_acs_height + INTER_LIST_SPACING + min_avs_height);

		/* Filling. */
		this->fill_x = LeastCommonMultiple(this->avs->fill_x, this->acs->fill_x);
		if (this->inf->fill_x > 0 && (this->fill_x == 0 || this->fill_x > this->inf->fill_x)) this->fill_x = this->inf->fill_x;

		this->fill_y = this->avs->fill_y;
		if (this->acs->fill_y > 0 && (this->fill_y == 0 || this->fill_y > this->acs->fill_y)) this->fill_y = this->acs->fill_y;
		this->fill_y = LeastCommonMultiple(this->fill_y, this->inf->fill_y);

		/* Resizing. */
		this->resize_x = LeastCommonMultiple(this->avs->resize_x, this->acs->resize_x);
		if (this->inf->resize_x > 0 && (this->resize_x == 0 || this->resize_x > this->inf->resize_x)) this->resize_x = this->inf->resize_x;

		this->resize_y = this->avs->resize_y;
		if (this->acs->resize_y > 0 && (this->resize_y == 0 || this->resize_y > this->acs->resize_y)) this->resize_y = this->acs->resize_y;
		this->resize_y = LeastCommonMultiple(this->resize_y, this->inf->resize_y);
	}

	virtual void AssignSizePosition(SizingType sizing, uint x, uint y, uint given_width, uint given_height, bool rtl)
	{
		this->StoreSizePosition(sizing, x, y, given_width, given_height);

		uint min_avs_width = this->avs->smallest_x + this->avs->padding_left + this->avs->padding_right;
		uint min_acs_width = this->acs->smallest_x + this->acs->padding_left + this->acs->padding_right;
		uint min_inf_width = this->inf->smallest_x + this->inf->padding_left + this->inf->padding_right;

		uint min_list_width = max(min_avs_width, min_acs_width); // Smallest width of the lists such that they have equal width (incl padding).
		uint avs_extra_width = min_list_width - min_avs_width;   // Additional width needed for avs to reach min_list_width.
		uint acs_extra_width = min_list_width - min_acs_width;   // Additional width needed for acs to reach min_list_width.

		/* Use 2 or 3 colmuns? */
		uint min_three_columns = min_avs_width + min_acs_width + min_inf_width + 2 * INTER_COLUMN_SPACING;
		uint min_two_columns   = min_list_width + min_inf_width + INTER_COLUMN_SPACING;
		bool use_three_columns = this->editable && (min_three_columns + MIN_EXTRA_FOR_3_COLUMNS <= given_width);

		/* Info panel is a seperate column in both modes. Compute its width first. */
		uint extra_width, inf_width;
		if (use_three_columns) {
			extra_width = given_width - min_three_columns;
			inf_width = min(MAX_EXTRA_INFO_WIDTH, extra_width / 2);
		} else {
			extra_width = given_width - min_two_columns;
			inf_width = min(MAX_EXTRA_INFO_WIDTH, extra_width / 2);
		}
		inf_width = ComputeMaxSize(this->inf->smallest_x, this->inf->smallest_x + inf_width, this->inf->GetHorizontalStepSize(sizing));
		extra_width -= inf_width - this->inf->smallest_x;

		uint inf_height = ComputeMaxSize(this->inf->smallest_y, given_height, this->inf->GetVerticalStepSize(sizing));

		if (use_three_columns) {
			/* Three column display, first make both lists equally wide, then divide whatever is left between both lists.
			 * Only keep track of what avs gets, all other space goes to acs. */
			uint avs_width = min(avs_extra_width, extra_width);
			extra_width -= avs_width;
			extra_width -= min(acs_extra_width, extra_width);
			avs_width += extra_width / 2;

			avs_width = ComputeMaxSize(this->avs->smallest_x, this->avs->smallest_x + avs_width, this->avs->GetHorizontalStepSize(sizing));

			uint acs_width = given_width - // Remaining space, including horizontal padding.
					inf_width - this->inf->padding_left - this->inf->padding_right -
					avs_width - this->avs->padding_left - this->avs->padding_right - 2 * INTER_COLUMN_SPACING;
			acs_width = ComputeMaxSize(min_acs_width, acs_width, this->acs->GetHorizontalStepSize(sizing)) -
					this->acs->padding_left - this->acs->padding_right;

			uint avs_height = ComputeMaxSize(this->avs->smallest_y, given_height, this->avs->GetVerticalStepSize(sizing));
			uint acs_height = ComputeMaxSize(this->acs->smallest_y, given_height, this->acs->GetVerticalStepSize(sizing));

			/* Assign size and position to the childs. */
			if (rtl) {
				x += this->inf->padding_left;
				this->inf->AssignSizePosition(sizing, x, y + this->inf->padding_top, inf_width, inf_height, rtl);
				x += inf_width + this->inf->padding_right + INTER_COLUMN_SPACING;
			} else {
				x += this->avs->padding_left;
				this->avs->AssignSizePosition(sizing, x, y + this->avs->padding_top, avs_width, avs_height, rtl);
				x += avs_width + this->avs->padding_right + INTER_COLUMN_SPACING;
			}

			x += this->acs->padding_left;
			this->acs->AssignSizePosition(sizing, x, y + this->acs->padding_top, acs_width, acs_height, rtl);
			x += acs_width + this->acs->padding_right + INTER_COLUMN_SPACING;

			if (rtl) {
				x += this->avs->padding_left;
				this->avs->AssignSizePosition(sizing, x, y + this->avs->padding_top, avs_width, avs_height, rtl);
			} else {
				x += this->inf->padding_left;
				this->inf->AssignSizePosition(sizing, x, y + this->inf->padding_top, inf_width, inf_height, rtl);
			}
		} else {
			/* Two columns, all space in extra_width goes to both lists. Since the lists are underneath each other,
			 * the column is min_list_width wide at least. */
			uint avs_width = ComputeMaxSize(this->avs->smallest_x, this->avs->smallest_x + avs_extra_width + extra_width,
					this->avs->GetHorizontalStepSize(sizing));
			uint acs_width = ComputeMaxSize(this->acs->smallest_x, this->acs->smallest_x + acs_extra_width + extra_width,
					this->acs->GetHorizontalStepSize(sizing));

			uint min_avs_height = (!this->editable) ? 0 : this->avs->smallest_y + this->avs->padding_top + this->avs->padding_bottom + INTER_LIST_SPACING;
			uint min_acs_height = this->acs->smallest_y + this->acs->padding_top + this->acs->padding_bottom;
			uint extra_height = given_height - min_acs_height - min_avs_height;

			uint avs_height = ComputeMaxSize(this->avs->smallest_y, this->avs->smallest_y + extra_height / 2, this->avs->GetVerticalStepSize(sizing));
			if (this->editable) extra_height -= avs_height - this->avs->smallest_y;
			uint acs_height = ComputeMaxSize(this->acs->smallest_y, this->acs->smallest_y + extra_height, this->acs->GetVerticalStepSize(sizing));

			/* Assign size and position to the childs. */
			if (rtl) {
				x += this->inf->padding_left;
				this->inf->AssignSizePosition(sizing, x, y + this->inf->padding_top, inf_width, inf_height, rtl);
				x += inf_width + this->inf->padding_right + INTER_COLUMN_SPACING;

				uint ypos = y + this->acs->padding_top;
				this->acs->AssignSizePosition(sizing, x + this->acs->padding_left, ypos, acs_width, acs_height, rtl);
				if (this->editable) {
					ypos += acs_height + this->acs->padding_bottom + INTER_LIST_SPACING + this->avs->padding_top;
					this->avs->AssignSizePosition(sizing, x + this->avs->padding_left, ypos, avs_width, avs_height, rtl);
				} else {
					this->avs->AssignSizePosition(sizing, 0, 0, this->avs->smallest_x, this->avs->smallest_y, rtl);
				}
			} else {
				uint ypos = y + this->acs->padding_top;
				this->acs->AssignSizePosition(sizing, x + this->acs->padding_left, ypos, acs_width, acs_height, rtl);
				if (this->editable) {
					ypos += acs_height + this->acs->padding_bottom + INTER_LIST_SPACING + this->avs->padding_top;
					this->avs->AssignSizePosition(sizing, x + this->avs->padding_left, ypos, avs_width, avs_height, rtl);
				} else {
					this->avs->AssignSizePosition(sizing, 0, 0, this->avs->smallest_x, this->avs->smallest_y, rtl);
				}
				uint dx = this->acs->current_x + this->acs->padding_left + this->acs->padding_right;
				if (this->editable) {
					dx = max(dx, this->avs->current_x + this->avs->padding_left + this->avs->padding_right);
				}
				x += dx + INTER_COLUMN_SPACING + this->inf->padding_left;
				this->inf->AssignSizePosition(sizing, x, y + this->inf->padding_top, inf_width, inf_height, rtl);
			}
		}
	}

	virtual NWidgetCore *GetWidgetFromPos(int x, int y)
	{
		if (!IsInsideBS(x, this->pos_x, this->current_x) || !IsInsideBS(y, this->pos_y, this->current_y)) return NULL;

		NWidgetCore *nw = (this->editable) ? this->avs->GetWidgetFromPos(x, y) : NULL;
		if (nw == NULL) nw = this->acs->GetWidgetFromPos(x, y);
		if (nw == NULL) nw = this->inf->GetWidgetFromPos(x, y);
		return nw;
	}

	virtual void Draw(const Window *w)
	{
		if (this->editable) this->avs->Draw(w);
		this->acs->Draw(w);
		this->inf->Draw(w);
	}
};

const uint NWidgetNewGRFDisplay::INTER_LIST_SPACING      = WD_RESIZEBOX_WIDTH + 1;
const uint NWidgetNewGRFDisplay::INTER_COLUMN_SPACING    = WD_RESIZEBOX_WIDTH;
const uint NWidgetNewGRFDisplay::MAX_EXTRA_INFO_WIDTH    = 150;
const uint NWidgetNewGRFDisplay::MIN_EXTRA_FOR_3_COLUMNS = 50;

static const NWidgetPart _nested_newgrf_actives_widgets[] = {
	/* Left side, presets. */
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_TEXT, COLOUR_MAUVE), SetDataTip(STR_NEWGRF_SETTINGS_SELECT_PRESET, STR_NULL),
				SetPadding(0, WD_FRAMETEXT_RIGHT, 0, 0),
		NWidget(WWT_DROPDOWN, COLOUR_YELLOW, SNGRFS_PRESET_LIST), SetFill(1, 0), SetResize(1, 0),
				SetDataTip(STR_JUST_STRING, STR_NEWGRF_SETTINGS_PRESET_LIST_TOOLTIP),
	EndContainer(),
	NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
		NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, SNGRFS_PRESET_SAVE), SetFill(1, 0), SetResize(1, 0),
				SetDataTip(STR_NEWGRF_SETTINGS_PRESET_SAVE, STR_NEWGRF_SETTINGS_PRESET_SAVE_TOOLTIP),
		NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, SNGRFS_PRESET_DELETE), SetFill(1, 0), SetResize(1, 0),
				SetDataTip(STR_NEWGRF_SETTINGS_PRESET_DELETE, STR_NEWGRF_SETTINGS_PRESET_DELETE_TOOLTIP),
	EndContainer(),

	NWidget(NWID_SPACER), SetMinimalSize(0, WD_RESIZEBOX_WIDTH), SetResize(1, 0), SetFill(1, 0),
	NWidget(WWT_PANEL, COLOUR_MAUVE),
		NWidget(WWT_LABEL, COLOUR_MAUVE), SetDataTip(STR_NEWGRF_SETTINGS_ACTIVE_LIST, STR_NULL),
				SetFill(1, 0), SetResize(1, 0), SetPadding(3, WD_FRAMETEXT_RIGHT, 0, WD_FRAMETEXT_LEFT),
		/* Left side, active grfs. */
		NWidget(NWID_HORIZONTAL), SetPadding(0, 2, 0, 2),
			NWidget(WWT_PANEL, COLOUR_MAUVE),
				NWidget(WWT_INSET, COLOUR_MAUVE, SNGRFS_FILE_LIST), SetMinimalSize(100, 1), SetPadding(2, 2, 2, 2),
						SetFill(1, 1), SetResize(1, 1), SetScrollbar(SNGRFS_SCROLLBAR),
				EndContainer(),
			EndContainer(),
			NWidget(NWID_VSCROLLBAR, COLOUR_MAUVE, SNGRFS_SCROLLBAR),
		EndContainer(),
		/* Buttons. */
		NWidget(NWID_SELECTION, INVALID_COLOUR, SNGRFS_SHOW_REMOVE),
			NWidget(NWID_HORIZONTAL, NC_EQUALSIZE), SetPadding(2, 2, 2, 2), SetPIP(0, WD_RESIZEBOX_WIDTH, 0),
				NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, SNGRFS_REMOVE), SetFill(1, 0), SetResize(1, 0),
						SetDataTip(STR_NEWGRF_SETTINGS_REMOVE, STR_NEWGRF_SETTINGS_REMOVE_TOOLTIP),
				NWidget(NWID_VERTICAL),
					NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, SNGRFS_MOVE_UP), SetFill(1, 0), SetResize(1, 0),
							SetDataTip(STR_NEWGRF_SETTINGS_MOVEUP, STR_NEWGRF_SETTINGS_MOVEUP_TOOLTIP),
					NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, SNGRFS_MOVE_DOWN), SetFill(1, 0), SetResize(1, 0),
							SetDataTip(STR_NEWGRF_SETTINGS_MOVEDOWN, STR_NEWGRF_SETTINGS_MOVEDOWN_TOOLTIP),
				EndContainer(),
			EndContainer(),

			NWidget(NWID_VERTICAL, NC_EQUALSIZE), SetPadding(2, 2, 2, 2),
				NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, SNGRFS_RESCAN_FILES2), SetFill(1, 0), SetResize(1, 0),
						SetDataTip(STR_NEWGRF_SETTINGS_RESCAN_FILES, STR_NEWGRF_SETTINGS_RESCAN_FILES_TOOLTIP),
				NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, SNGRFS_CONTENT_DOWNLOAD2), SetFill(1, 0), SetResize(1, 0),
						SetDataTip(STR_INTRO_ONLINE_CONTENT, STR_INTRO_TOOLTIP_ONLINE_CONTENT),
			EndContainer(),
		EndContainer(),
	EndContainer(),
};

static const NWidgetPart _nested_newgrf_availables_widgets[] = {
	NWidget(WWT_PANEL, COLOUR_MAUVE),
		NWidget(WWT_LABEL, COLOUR_MAUVE), SetDataTip(STR_NEWGRF_SETTINGS_INACTIVE_LIST, STR_NULL),
				SetFill(1, 0), SetResize(1, 0), SetPadding(3, WD_FRAMETEXT_RIGHT, 0, WD_FRAMETEXT_LEFT),
		/* Left side, available grfs, filter edit box. */
		NWidget(NWID_HORIZONTAL), SetPadding(WD_TEXTPANEL_TOP, 0, WD_TEXTPANEL_BOTTOM, 0),
				SetPIP(WD_FRAMETEXT_LEFT, WD_FRAMETEXT_RIGHT, WD_FRAMETEXT_RIGHT),
			NWidget(WWT_TEXT, COLOUR_MAUVE), SetFill(0, 1), SetDataTip(STR_NEWGRF_FILTER_TITLE, STR_NULL),
			NWidget(WWT_EDITBOX, COLOUR_MAUVE, SNGRFS_FILTER), SetFill(1, 0), SetMinimalSize(50, 12), SetResize(1, 0),
					SetDataTip(STR_LIST_FILTER_OSKTITLE, STR_LIST_FILTER_TOOLTIP),
		EndContainer(),
		/* Left side, available grfs. */
		NWidget(NWID_HORIZONTAL), SetPadding(0, 2, 0, 2),
			NWidget(WWT_PANEL, COLOUR_MAUVE),
				NWidget(WWT_INSET, COLOUR_MAUVE, SNGRFS_AVAIL_LIST), SetMinimalSize(100, 1), SetPadding(2, 2, 2, 2),
						SetFill(1, 1), SetResize(1, 1), SetScrollbar(SNGRFS_SCROLL2BAR),
				EndContainer(),
			EndContainer(),
			NWidget(NWID_VSCROLLBAR, COLOUR_MAUVE, SNGRFS_SCROLL2BAR),
		EndContainer(),
		/* Left side, available grfs, buttons. */
		NWidget(NWID_HORIZONTAL, NC_EQUALSIZE), SetPadding(2, 2, 2, 2), SetPIP(0, WD_RESIZEBOX_WIDTH, 0),
			NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, SNGRFS_ADD), SetFill(1, 0), SetResize(1, 0),
					SetDataTip(STR_NEWGRF_SETTINGS_ADD, STR_NEWGRF_SETTINGS_ADD_FILE_TOOLTIP),
			NWidget(NWID_VERTICAL),
				NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, SNGRFS_RESCAN_FILES), SetFill(1, 0), SetResize(1, 0),
						SetDataTip(STR_NEWGRF_SETTINGS_RESCAN_FILES, STR_NEWGRF_SETTINGS_RESCAN_FILES_TOOLTIP),
				NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, SNGRFS_CONTENT_DOWNLOAD), SetFill(1, 0), SetResize(1, 0),
						SetDataTip(STR_INTRO_ONLINE_CONTENT, STR_INTRO_TOOLTIP_ONLINE_CONTENT),
			EndContainer(),
		EndContainer(),
	EndContainer(),
};

static const NWidgetPart _nested_newgrf_infopanel_widgets[] = {
	/* Right side, info panel. */
	NWidget(WWT_PANEL, COLOUR_MAUVE), SetPadding(0, 0, 2, 0),
		NWidget(WWT_EMPTY, COLOUR_MAUVE, SNGRFS_NEWGRF_INFO_TITLE), SetFill(1, 0), SetResize(1, 0),
		NWidget(WWT_EMPTY, COLOUR_MAUVE, SNGRFS_NEWGRF_INFO), SetFill(1, 1), SetResize(1, 1), SetMinimalSize(150, 100),
	EndContainer(),
	NWidget(NWID_SELECTION, INVALID_COLOUR, SNGRFS_SHOW_APPLY),
		/* Right side, buttons. */
		NWidget(NWID_HORIZONTAL, NC_EQUALSIZE), SetPIP(0, WD_RESIZEBOX_WIDTH, 0),
			NWidget(NWID_VERTICAL),
				NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, SNGRFS_SET_PARAMETERS), SetFill(1, 0), SetResize(1, 0),
						SetDataTip(STR_NEWGRF_SETTINGS_SET_PARAMETERS, STR_NULL),
				NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, SNGRFS_TOGGLE_PALETTE), SetFill(1, 0), SetResize(1, 0),
						SetDataTip(STR_NEWGRF_SETTINGS_TOGGLE_PALETTE, STR_NEWGRF_SETTINGS_TOGGLE_PALETTE_TOOLTIP),
			EndContainer(),
			NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, SNGRFS_APPLY_CHANGES), SetFill(1, 0), SetResize(1, 0),
					SetDataTip(STR_NEWGRF_SETTINGS_APPLY_CHANGES, STR_NULL),
		EndContainer(),
	EndContainer(),
};

/** Construct nested container widget for managing the lists and the info panel of the NewGRF GUI. */
NWidgetBase* NewGRFDisplay(int *biggest_index)
{
	NWidgetBase *avs = MakeNWidgets(_nested_newgrf_availables_widgets, lengthof(_nested_newgrf_availables_widgets), biggest_index, NULL);

	int biggest2;
	NWidgetBase *acs = MakeNWidgets(_nested_newgrf_actives_widgets, lengthof(_nested_newgrf_actives_widgets), &biggest2, NULL);
	*biggest_index = max(*biggest_index, biggest2);

	NWidgetBase *inf = MakeNWidgets(_nested_newgrf_infopanel_widgets, lengthof(_nested_newgrf_infopanel_widgets), &biggest2, NULL);
	*biggest_index = max(*biggest_index, biggest2);

	return new NWidgetNewGRFDisplay(avs, acs, inf);
}

/* Widget definition of the manage newgrfs window */
static const NWidgetPart _nested_newgrf_widgets[] = {
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_CLOSEBOX, COLOUR_MAUVE),
		NWidget(WWT_CAPTION, COLOUR_MAUVE), SetDataTip(STR_NEWGRF_SETTINGS_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
	EndContainer(),
	NWidget(WWT_PANEL, COLOUR_MAUVE),
		NWidgetFunction(NewGRFDisplay), SetPadding(WD_RESIZEBOX_WIDTH, WD_RESIZEBOX_WIDTH, 2, WD_RESIZEBOX_WIDTH),
		/* Resize button. */
		NWidget(NWID_HORIZONTAL),
			NWidget(NWID_SPACER), SetFill(1, 0), SetResize(1, 0),
			NWidget(WWT_RESIZEBOX, COLOUR_MAUVE),
		EndContainer(),
	EndContainer(),
};

/* Window definition of the manage newgrfs window */
static const WindowDesc _newgrf_desc(
	WDP_CENTER, 300, 263,
	WC_GAME_OPTIONS, WC_NONE,
	WDF_UNCLICK_BUTTONS,
	_nested_newgrf_widgets, lengthof(_nested_newgrf_widgets)
);

/**
 * Callback function for the newgrf 'apply changes' confirmation window
 * @param w Window which is calling this callback
 * @param confirmed boolean value, true when yes was clicked, false otherwise
 */
static void NewGRFConfirmationCallback(Window *w, bool confirmed)
{
	if (confirmed) {
		DeleteWindowByClass(WC_GRF_PARAMETERS);
		NewGRFWindow *nw = dynamic_cast<NewGRFWindow*>(w);

		GamelogStartAction(GLAT_GRF);
		GamelogGRFUpdate(_grfconfig, nw->actives); // log GRF changes
		CopyGRFConfigList(nw->orig_list, nw->actives, false);
		ReloadNewGRFData();
		GamelogStopAction();

		/* Show new, updated list */
		GRFConfig *c;
		int i = 0;
		for (c = nw->actives; c != NULL && c != nw->active_sel; c = c->next, i++) {}
		CopyGRFConfigList(&nw->actives, *nw->orig_list, false);
		for (c = nw->actives; c != NULL && i > 0; c = c->next, i--) {}
		nw->active_sel = c;
		nw->avails.ForceRebuild();

		w->InvalidateData();

		ReInitAllWindows();
		DeleteWindowByClass(WC_BUILD_OBJECT);
	}
}



/**
 * Setup the NewGRF gui
 * @param editable allow the user to make changes to the grfconfig in the window
 * @param show_params show information about what parameters are set for the grf files
 * @param exec_changes if changes are made to the list (editable is true), apply these
 *        changes immediately or only update the list
 * @param config pointer to a linked-list of grfconfig's that will be shown
 */
void ShowNewGRFSettings(bool editable, bool show_params, bool exec_changes, GRFConfig **config)
{
	DeleteWindowByClass(WC_GAME_OPTIONS);
	new NewGRFWindow(&_newgrf_desc, editable, show_params, exec_changes, config);
}