summaryrefslogtreecommitdiffstats
path: root/extensions/vertical-workspaces/lib/appDisplay.js
blob: 2ac70b19371b8c8ded9c10b08db740f338215651 (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
/**
 * V-Shell (Vertical Workspaces)
 * appDisplay.js
 *
 * @author     GdH <G-dH@github.com>
 * @copyright  2022 - 2023
 * @license    GPL-3.0
 *
 */

'use strict';

const { Clutter, GLib, GObject, Meta, Shell, St, Graphene, Pango } = imports.gi;

const DND = imports.ui.dnd;
const Main = imports.ui.main;
const AppDisplay = imports.ui.appDisplay;
const IconGrid = imports.ui.iconGrid;

const ExtensionUtils = imports.misc.extensionUtils;
const Me = ExtensionUtils.getCurrentExtension();
const IconGridOverride = Me.imports.lib.iconGrid;
const _Util = Me.imports.lib.util;

const DIALOG_SHADE_NORMAL = Clutter.Color.from_pixel(0x00000022);
const DIALOG_SHADE_HIGHLIGHT = Clutter.Color.from_pixel(0x00000000);

// gettext
const _ = Me.imports.lib.settings._;

let _overrides;

let _appGridLayoutSettings;
let _appDisplayScrollConId;
let _appSystemStateConId;
let _appGridLayoutConId;
let _origAppViewItemAcceptDrop;
let _updateFolderIcons;

let opt;
let shellVersion = _Util.shellVersion;
let _firstRun = true;

function update(reset = false) {
    opt = Me.imports.lib.settings.opt;
    const moduleEnabled = opt.get('appDisplayModule', true);
    reset = reset || !moduleEnabled;

    // don't even touch this module if disabled
    if (_firstRun && reset)
        return;

    _firstRun = false;

    if (_overrides)
        _overrides.removeAll();

    if (reset) {
        _setAppDisplayOrientation(false);
        _updateAppGridProperties(reset);
        _updateAppGridDND(reset);
        _restoreOverviewGroup();
        _overrides = null;
        opt = null;
        return;
    }

    _overrides = new _Util.Overrides();

    if (opt.ORIENTATION === Clutter.Orientation.VERTICAL) {
        _overrides.addOverride('AppDisplayVertical', AppDisplay.AppDisplay.prototype, AppDisplayVertical);
        _overrides.addOverride('BaseAppViewVertical', AppDisplay.BaseAppView.prototype, BaseAppViewVertical);
    }

    // Custom App Grid
    _overrides.addOverride('AppFolderDialog', AppDisplay.AppFolderDialog.prototype, AppFolderDialog);
    if (shellVersion >= 43) {
        // const defined class needs to be touched before real access
        AppDisplay.BaseAppViewGridLayout;
        _overrides.addOverride('BaseAppViewGridLayout', AppDisplay.BaseAppViewGridLayout.prototype, BaseAppViewGridLayout);
    }
    _overrides.addOverride('FolderView', AppDisplay.FolderView.prototype, FolderView);
    _overrides.addOverride('FolderIcon', AppDisplay.FolderIcon.prototype, FolderIcon);
    _overrides.addOverride('AppIcon', AppDisplay.AppIcon.prototype, AppIcon);
    _overrides.addOverride('AppDisplay', AppDisplay.AppDisplay.prototype, AppDisplayCommon);
    _overrides.addOverride('AppViewItem', AppDisplay.AppViewItem.prototype, AppViewItemCommon);
    _overrides.addOverride('BaseAppViewCommon', AppDisplay.BaseAppView.prototype, BaseAppViewCommon);

    _setAppDisplayOrientation(opt.ORIENTATION === Clutter.Orientation.VERTICAL);
    _updateAppGridProperties();
    _updateAppGridDND();
    opt._appGridNeedsRedisplay = true;
}

function _setAppDisplayOrientation(vertical = false) {
    const CLUTTER_ORIENTATION = vertical ? Clutter.Orientation.VERTICAL : Clutter.Orientation.HORIZONTAL;
    const scroll = vertical ? 'vscroll' : 'hscroll';
    // app display to vertical has issues - page indicator not working
    // global appDisplay orientation switch is not built-in
    let appDisplay = Main.overview._overview._controls._appDisplay;
    // following line itself only changes in which axis will operate overshoot detection which switches appDisplay pages while dragging app icon to vertical
    appDisplay._orientation = CLUTTER_ORIENTATION;
    appDisplay._grid.layoutManager._orientation = CLUTTER_ORIENTATION;
    appDisplay._swipeTracker.orientation = CLUTTER_ORIENTATION;
    appDisplay._swipeTracker._reset();
    if (vertical) {
        appDisplay._scrollView.set_policy(St.PolicyType.NEVER, St.PolicyType.EXTERNAL);

        // move and change orientation of page indicators
        // needs corrections in appgrid page calculations, e.g. appDisplay.adaptToSize() fnc,
        // which complicates use of super call inside the function
        const pageIndicators = appDisplay._pageIndicators;
        pageIndicators.vertical = true;
        appDisplay._box.vertical = false;
        pageIndicators.x_expand = false;
        pageIndicators.y_align = Clutter.ActorAlign.CENTER;
        pageIndicators.x_align = Clutter.ActorAlign.START;

        const scrollContainer = appDisplay._scrollView.get_parent();
        if (shellVersion < 43) {
            // remove touch friendly side navigation bars / arrows
            if (appDisplay._hintContainer && appDisplay._hintContainer.get_parent())
                scrollContainer.remove_child(appDisplay._hintContainer);
        } else {
            // moving these bars needs more patching of the appDisplay's code
            // for now we just change bars style to be more like vertically oriented arrows indicating direction to prev/next page
            appDisplay._nextPageIndicator.add_style_class_name('nextPageIndicator');
            appDisplay._prevPageIndicator.add_style_class_name('prevPageIndicator');
        }

        // setting their x_scale to 0 removes the arrows and avoid allocation issues compared to .hide() them
        appDisplay._nextPageArrow.scale_x = 0;
        appDisplay._prevPageArrow.scale_x = 0;
    } else {
        appDisplay._scrollView.set_policy(St.PolicyType.EXTERNAL, St.PolicyType.NEVER);
        if (_appDisplayScrollConId) {
            appDisplay._adjustment.disconnect(_appDisplayScrollConId);
            _appDisplayScrollConId = 0;
        }

        // restore original page indicators
        const pageIndicators = appDisplay._pageIndicators;
        pageIndicators.vertical = false;
        appDisplay._box.vertical = true;
        pageIndicators.x_expand = true;
        pageIndicators.y_align = Clutter.ActorAlign.END;
        pageIndicators.x_align = Clutter.ActorAlign.CENTER;

        // put back touch friendly navigation bars/buttons
        const scrollContainer = appDisplay._scrollView.get_parent();
        if (appDisplay._hintContainer && !appDisplay._hintContainer.get_parent()) {
            scrollContainer.add_child(appDisplay._hintContainer);
            // the hit container covers the entire app grid and added at the top of the stack blocks DND drops
            // so it needs to be pushed below
            scrollContainer.set_child_below_sibling(appDisplay._hintContainer, null);
        }

        appDisplay._nextPageArrow.scale_x = 1;
        appDisplay._prevPageArrow.scale_x = 1;

        appDisplay._nextPageIndicator.remove_style_class_name('nextPageIndicator');
        appDisplay._prevPageIndicator.remove_style_class_name('prevPageIndicator');
    }

    // value for page indicator is calculated from scroll adjustment, horizontal needs to be replaced by vertical
    appDisplay._adjustment = appDisplay._scrollView[scroll].adjustment;

    // no need to connect already connected signal (wasn't removed the original one before)
    if (!vertical) {
        // reset used appDisplay properties
        Main.overview._overview._controls._appDisplay.scale_y = 1;
        Main.overview._overview._controls._appDisplay.scale_x = 1;
        Main.overview._overview._controls._appDisplay.opacity = 255;
        return;
    }

    // update appGrid dot pages indicators
    _appDisplayScrollConId = appDisplay._adjustment.connect('notify::value', adj => {
        const value = adj.value / adj.page_size;
        appDisplay._pageIndicators.setCurrentPosition(value);
    });
}

// Set App Grid columns, rows, icon size, incomplete pages
function _updateAppGridProperties(reset = false) {
    opt._appGridNeedsRedisplay = false;
    // columns, rows, icon size
    const appDisplay = Main.overview._overview._controls._appDisplay;
    appDisplay.visible = true;

    if (reset) {
        appDisplay._grid.layoutManager.fixedIconSize = -1;
        appDisplay._grid.layoutManager.allow_incomplete_pages = true;
        appDisplay._grid.setGridModes();
        if (_appGridLayoutSettings) {
            _appGridLayoutSettings.disconnect(_appGridLayoutConId);
            _appGridLayoutConId = 0;
            _appGridLayoutSettings = null;
        }
        appDisplay._redisplay();

        appDisplay._grid.set_style('');
        _resetAppGrid();
    } else {
        // update grid on layout reset
        if (!_appGridLayoutSettings) {
            _appGridLayoutSettings = ExtensionUtils.getSettings('org.gnome.shell');
            _appGridLayoutConId = _appGridLayoutSettings.connect('changed::app-picker-layout', _resetAppGrid);
        }

        appDisplay._grid.layoutManager.allow_incomplete_pages = opt.APP_GRID_ALLOW_INCOMPLETE_PAGES;
        appDisplay._grid.set_style(`column-spacing: ${opt.APP_GRID_SPACING}px; row-spacing: ${opt.APP_GRID_SPACING}px;`);

        // force redisplay
        appDisplay._grid._currentMode = -1;
        appDisplay._grid.setGridModes();
        appDisplay._grid.layoutManager.fixedIconSize = opt.APP_GRID_ICON_SIZE;
        // appDisplay._folderIcons.forEach(folder => folder._dialog?._updateFolderSize());
        _resetAppGrid();
    }
}

function _updateAppGridDND(reset) {
    if (!reset) {
        if (!_appSystemStateConId && opt.APP_GRID_INCLUDE_DASH >= 3) {
            _appSystemStateConId = Shell.AppSystem.get_default().connect(
                'app-state-changed',
                () => {
                    _updateFolderIcons = true;
                    Main.overview._overview._controls._appDisplay._redisplay();
                }
            );
        }
    } else if (_appSystemStateConId) {
        Shell.AppSystem.get_default().disconnect(_appSystemStateConId);
        _appSystemStateConId = 0;
    }
    if (opt.APP_GRID_ORDER && !reset) {
        if (!_origAppViewItemAcceptDrop)
            _origAppViewItemAcceptDrop = AppDisplay.AppViewItem.prototype.acceptDrop;
        AppDisplay.AppViewItem.prototype.acceptDrop = () => false;
    } else if (_origAppViewItemAcceptDrop) {
        AppDisplay.AppViewItem.prototype.acceptDrop = _origAppViewItemAcceptDrop;
    }
}

function _restoreOverviewGroup() {
    Main.overview.dash.showAppsButton.checked = false;
    Main.layoutManager.overviewGroup.opacity = 255;
    Main.layoutManager.overviewGroup.scale_x = 1;
    Main.layoutManager.overviewGroup.hide();
}

const AppDisplayVertical = {
    // correction of the appGrid size when page indicators were moved from the bottom to the right
    adaptToSize(width, height) {
        const [, indicatorWidth] = this._pageIndicators.get_preferred_width(-1);
        width -= indicatorWidth;

        this._grid.findBestModeForSize(width, height);

        const adaptToSize = AppDisplay.BaseAppView.prototype.adaptToSize.bind(this);
        adaptToSize(width, height);
    },
};

const AppDisplayCommon = {
    _ensureDefaultFolders() {
        // disable creation of default folders if user deleted them
    },

    _redisplay() {
        this._folderIcons.forEach(icon => {
            icon.view._redisplay();
        });

        BaseAppViewCommon._redisplay.bind(this)();
    },

    // apps load adapted for custom sorting and including dash items
    _loadApps() {
        let appIcons = [];
        const runningApps = Shell.AppSystem.get_default().get_running().map(a => a.id);

        this._appInfoList = Shell.AppSystem.get_default().get_installed().filter(appInfo => {
            try {
                appInfo.get_id(); // catch invalid file encodings
            } catch (e) {
                return false;
            }

            const appIsRunning = runningApps.includes(appInfo.get_id());
            const appIsFavorite = this._appFavorites.isFavorite(appInfo.get_id());
            const excludeApp = (opt.APP_GRID_EXCLUDE_RUNNING && appIsRunning) || (opt.APP_GRID_EXCLUDE_FAVORITES && appIsFavorite);

            return this._parentalControlsManager.shouldShowApp(appInfo) && !excludeApp;
        });

        let apps = this._appInfoList.map(app => app.get_id());

        let appSys = Shell.AppSystem.get_default();

        const appsInsideFolders = new Set();
        this._folderIcons = [];
        if (!opt.APP_GRID_ORDER) {
            let folders = this._folderSettings.get_strv('folder-children');
            folders.forEach(id => {
                let path = `${this._folderSettings.path}folders/${id}/`;
                let icon = this._items.get(id);
                if (!icon) {
                    icon = new AppDisplay.FolderIcon(id, path, this);
                    icon.connect('apps-changed', () => {
                        this._redisplay();
                        this._savePages();
                    });
                    icon.connect('notify::pressed', () => {
                        if (icon.pressed)
                            this.updateDragFocus(icon);
                    });
                } else if (_updateFolderIcons && opt.APP_GRID_EXCLUDE_RUNNING) {
                    // if any app changed its running state, update folder icon
                    icon.icon.update();
                }

                // remove empty folder icons
                if (!icon.visible) {
                    icon.destroy();
                    return;
                }

                appIcons.push(icon);
                this._folderIcons.push(icon);

                icon.getAppIds().forEach(appId => appsInsideFolders.add(appId));
            });
        }
        // reset request to update active icon
        _updateFolderIcons = false;

        // Allow dragging of the icon only if the Dash would accept a drop to
        // change favorite-apps. There are no other possible drop targets from
        // the app picker, so there's no other need for a drag to start,
        // at least on single-monitor setups.
        // This also disables drag-to-launch on multi-monitor setups,
        // but we hope that is not used much.
        const isDraggable =
            global.settings.is_writable('favorite-apps') ||
            global.settings.is_writable('app-picker-layout');

        apps.forEach(appId => {
            if (!opt.APP_GRID_ORDER && appsInsideFolders.has(appId))
                return;

            let icon = this._items.get(appId);
            if (!icon) {
                let app = appSys.lookup_app(appId);
                icon = new AppDisplay.AppIcon(app, { isDraggable });
                icon.connect('notify::pressed', () => {
                    if (icon.pressed)
                        this.updateDragFocus(icon);
                });
            }

            appIcons.push(icon);
        });

        // At last, if there's a placeholder available, add it
        if (this._placeholder)
            appIcons.push(this._placeholder);

        return appIcons;
    },

    // support active preview icons
    _onDragBegin(overview, source) {
        if (source._sourceItem)
            source = source._sourceItem;

        this._dragMonitor = {
            dragMotion: this._onDragMotion.bind(this),
        };
        DND.addDragMonitor(this._dragMonitor);
        if (shellVersion < 43)
            this._slideSidePages(AppDisplay.SidePages.PREVIOUS | AppDisplay.SidePages.NEXT | AppDisplay.SidePages.DND);
        else
            this._appGridLayout.showPageIndicators();
        this._dragFocus = null;
        this._swipeTracker.enabled = false;

        // When dragging from a folder dialog, the dragged app icon doesn't
        // exist in AppDisplay. We work around that by adding a placeholder
        // icon that is either destroyed on cancel, or becomes the effective
        // new icon when dropped.
        if (AppDisplay._getViewFromIcon(source) instanceof AppDisplay.FolderView ||
            (opt.APP_GRID_EXCLUDE_FAVORITES && this._appFavorites.isFavorite(source.id)))
            this._ensurePlaceholder(source);
    },

    _ensurePlaceholder(source) {
        if (this._placeholder)
            return;

        if (source._sourceItem)
            source = source._sourceItem;

        const appSys = Shell.AppSystem.get_default();
        const app = appSys.lookup_app(source.id);

        const isDraggable =
            global.settings.is_writable('favorite-apps') ||
            global.settings.is_writable('app-picker-layout');

        this._placeholder = new AppDisplay.AppIcon(app, { isDraggable });
        this._placeholder.connect('notify::pressed', () => {
            if (this._placeholder?.pressed)
                this.updateDragFocus(this._placeholder);
        });
        this._placeholder.scaleAndFade();
        this._redisplay();
    },

    // accept source from active preview
    acceptDrop(source) {
        if (opt.APP_GRID_ORDER)
            return false;
        if (source._sourceItem)
            source = source._sourceItem;

        let dropTarget = null;
        if (shellVersion >= 43) {
            dropTarget = this._dropTarget;
            delete this._dropTarget;
        }

        if (!this._canAccept(source))
            return false;

        if ((shellVersion < 43 && this._dropPage) ||
            (shellVersion >= 43 && (dropTarget === this._prevPageIndicator ||
            dropTarget === this._nextPageIndicator))) {
            let increment;

            if (shellVersion < 43)
                increment = this._dropPage === AppDisplay.SidePages.NEXT ? 1 : -1;
            else
                increment = dropTarget === this._prevPageIndicator ? -1 : 1;

            const { currentPage, nPages } = this._grid;
            const page = Math.min(currentPage + increment, nPages);
            const position = page < nPages ? -1 : 0;

            this._moveItem(source, page, position);
            this.goToPage(page);
        } else if (this._delayedMoveData) {
            // Dropped before the icon was moved
            const { page, position } = this._delayedMoveData;

            try {
                this._moveItem(source, page, position);
            } catch (e) {
                log(`Warning:${e}`);
            }
            this._removeDelayedMove();
        }

        this._savePages();

        let view = AppDisplay._getViewFromIcon(source);
        if (view instanceof AppDisplay.FolderView)
            view.removeApp(source.app);

        if (this._currentDialog)
            this._currentDialog.popdown();

        if (opt.APP_GRID_EXCLUDE_FAVORITES && this._appFavorites.isFavorite(source.id))
            this._appFavorites.removeFavorite(source.id);

        return true;
    },
};

const BaseAppViewVertical = {
    after__init() {
        this._grid.layoutManager._orientation = Clutter.Orientation.VERTICAL;
        this._scrollView.set_policy(St.PolicyType.NEVER, St.PolicyType.EXTERNAL);
        this._orientation = Clutter.Orientation.VERTICAL;
        this._swipeTracker.orientation = Clutter.Orientation.VERTICAL;
        this._swipeTracker._reset();
        this._pageIndicators.vertical = true;
        this._box.vertical = false;
        this._pageIndicators.x_expand = false;
        this._pageIndicators.y_align = Clutter.ActorAlign.CENTER;
        this._pageIndicators.x_align = Clutter.ActorAlign.START;
        this._pageIndicators.set_style('margin-right: 10px;');
        const scrollContainer = this._scrollView.get_parent();
        if (shellVersion < 43) {
            // remove touch friendly side navigation bars / arrows
            if (this._hintContainer && this._hintContainer.get_parent())
                scrollContainer.remove_child(this._hintContainer);
        } else {
            // moving these bars needs more patching of the this's code
            // for now we just change bars style to be more like vertically oriented arrows indicating direction to prev/next page
            this._nextPageIndicator.add_style_class_name('nextPageIndicator');
            this._prevPageIndicator.add_style_class_name('prevPageIndicator');
        }

        // setting their x_scale to 0 removes the arrows and avoid allocation issues compared to .hide() them
        this._nextPageArrow.scale_x = 0;
        this._prevPageArrow.scale_x = 0;

        this._adjustment = this._scrollView.vscroll.adjustment;

        this._adjustment.connect('notify::value', adj => {
            const value = adj.value / adj.page_size;
            this._pageIndicators.setCurrentPosition(value);
        });
    },
    // <= 42 only, this fixes dnd from appDisplay to the workspace thumbnail on the left if appDisplay is on page 1 because of appgrid left overshoot
    _pageForCoords() {
        return AppDisplay.SidePages.NONE;
    },
};

const BaseAppViewCommon = {
    _sortOrderedItemsAlphabetically(icons = null) {
        if (!icons)
            icons = this._orderedItems;
        icons.sort((a, b) => a.name.toLowerCase().localeCompare(b.name.toLowerCase()));
    },

    _setLinearPositions(icons) {
        const { itemsPerPage } = this._grid;
        icons.forEach((icon, i) => {
            const page = Math.floor(i / itemsPerPage);
            const position = i % itemsPerPage;
            try {
                this._moveItem(icon, page, position);
            } catch (e) {
                log(`Warning:${e}`);
            }
        });
    },

    // adds sorting options and option to add favorites and running apps
    _redisplay() {
        let oldApps = this._orderedItems.slice();
        let oldAppIds = oldApps.map(icon => icon.id);

        let newApps = this._loadApps().sort(this._compareItems.bind(this));
        let newAppIds = newApps.map(icon => icon.id);

        let addedApps = newApps.filter(icon => !oldAppIds.includes(icon.id));
        let removedApps = oldApps.filter(icon => !newAppIds.includes(icon.id));

        // Remove old app icons
        removedApps.forEach(icon => {
            this._removeItem(icon);
            icon.destroy();
        });

        // Add new app icons, or move existing ones
        newApps.forEach(icon => {
            const [page, position] = this._getItemPosition(icon);
            if (addedApps.includes(icon)) {
                this._addItem(icon, page, position);
            } else if (page !== -1 && position !== -1) {
                this._moveItem(icon, page, position);
            } else {
                // App is part of a folder
            }
        });

        // sort all alphabetically
        if (opt.APP_GRID_ORDER > 0) {
            // const { itemsPerPage } = this._grid;
            let appIcons = this._orderedItems;
            this._sortOrderedItemsAlphabetically(appIcons);
            // appIcons.sort((a, b) => a.name.toLowerCase().localeCompare(b.name.toLowerCase()));
            // then sort used apps by usage
            if (opt.APP_GRID_ORDER === 2)
                appIcons.sort((a, b) => Shell.AppUsage.get_default().compare(a.app.id, b.app.id));

            // sort favorites first
            if (opt.APP_GRID_DASH_FIRST) {
                const fav = Object.keys(this._appFavorites._favorites);
                appIcons.sort((a, b) => {
                    let aFav = fav.indexOf(a.id);
                    if (aFav < 0)
                        aFav = 999;
                    let bFav = fav.indexOf(b.id);
                    if (bFav < 0)
                        bFav = 999;
                    return bFav < aFav;
                });
            }

            // sort running first
            if (opt.APP_GRID_DASH_FIRST)
                appIcons.sort((a, b) => a.app.get_state() !== Shell.AppState.RUNNING && b.app.get_state() === Shell.AppState.RUNNING);

            this._setLinearPositions(appIcons);

            this._orderedItems = appIcons;
        }

        this.emit('view-loaded');
        if (!opt.APP_GRID_ALLOW_INCOMPLETE_PAGES) {
            for (let i = 0; i < this._grid.nPages; i++)
                this._grid.layoutManager._fillItemVacancies(i);
        }
    },

    _canAccept(source) {
        return opt.APP_GRID_ORDER ? false : source instanceof AppDisplay.AppViewItem;
    },

    // support active preview icons
    acceptDrop(source) {
        if (!this._canAccept(source))
            return false;

        if (source._sourceItem)
            source = source._sourceItem;


        if (this._dropPage) {
            const increment = this._dropPage === AppDisplay.SidePages.NEXT ? 1 : -1;
            const { currentPage, nPages } = this._grid;
            const page = Math.min(currentPage + increment, nPages);
            const position = page < nPages ? -1 : 0;

            this._moveItem(source, page, position);
            this.goToPage(page);
        } else if (this._delayedMoveData) {
            // Dropped before the icon was moved
            const { page, position } = this._delayedMoveData;

            this._moveItem(source, page, position);
            this._removeDelayedMove();
        }

        return true;
    },

    // support active preview icons
    _onDragMotion(dragEvent) {
        if (!(dragEvent.source instanceof AppDisplay.AppViewItem))
            return DND.DragMotionResult.CONTINUE;

        if (dragEvent.source._sourceItem)
            dragEvent.source = dragEvent.source._sourceItem;

        const appIcon = dragEvent.source;

        if (shellVersion < 43) {
            this._dropPage = this._pageForCoords(dragEvent.x, dragEvent.y);
            if (this._dropPage &&
               this._dropPage === AppDisplay.SidePages.PREVIOUS &&
               this._grid.currentPage === 0) {
                delete this._dropPage;
                return DND.DragMotionResult.NO_DROP;
            }
        }

        if (appIcon instanceof AppDisplay.AppViewItem) {
            if (shellVersion < 44) {
                // Handle the drag overshoot. When dragging to above the
                // icon grid, move to the page above; when dragging below,
                // move to the page below.
                this._handleDragOvershoot(dragEvent);
            } else if (!this._dragMaybeSwitchPageImmediately(dragEvent)) {
                // Two ways of switching pages during DND:
                // 1) When "bumping" the cursor against the monitor edge, we switch
                //    page immediately.
                // 2) When hovering over the next-page indicator for a certain time,
                //    we also switch page.

                const { targetActor } = dragEvent;

                if (targetActor === this._prevPageIndicator ||
                            targetActor === this._nextPageIndicator)
                    this._maybeSetupDragPageSwitchInitialTimeout(dragEvent);
                else
                    this._resetDragPageSwitch();
            }
        }

        this._maybeMoveItem(dragEvent);

        return DND.DragMotionResult.CONTINUE;
    },

    // adjustable page width for GS <= 42
    adaptToSize(width, height, isFolder = false) {
        let box = new Clutter.ActorBox({
            x2: width,
            y2: height,
        });
        box = this.get_theme_node().get_content_box(box);
        box = this._scrollView.get_theme_node().get_content_box(box);
        box = this._grid.get_theme_node().get_content_box(box);

        const availWidth = box.get_width();
        const availHeight = box.get_height();

        let pageWidth, pageHeight;

        pageHeight = availHeight;
        pageWidth = Math.ceil(availWidth * (isFolder ? 1 : opt.APP_GRID_PAGE_WIDTH_SCALE));
        // subtract space for navigation arrows in horizontal mode
        pageWidth -= opt.ORIENTATION ? 0 : 128;

        this._grid.layout_manager.pagePadding.left =
                Math.floor(availWidth * 0.02);
        this._grid.layout_manager.pagePadding.right =
                Math.ceil(availWidth * 0.02);

        this._grid.adaptToSize(pageWidth, pageHeight);

        const leftPadding = Math.floor(
            (availWidth - this._grid.layout_manager.pageWidth) / 2);
        const rightPadding = Math.ceil(
            (availWidth - this._grid.layout_manager.pageWidth) / 2);
        const topPadding = Math.floor(
            (availHeight - this._grid.layout_manager.pageHeight) / 2);
        const bottomPadding = Math.ceil(
            (availHeight - this._grid.layout_manager.pageHeight) / 2);

        this._scrollView.content_padding = new Clutter.Margin({
            left: leftPadding,
            right: rightPadding,
            top: topPadding,
            bottom: bottomPadding,
        });

        this._availWidth = availWidth;
        this._availHeight = availHeight;

        this._pageIndicatorOffset = leftPadding;
        this._pageArrowOffset = Math.max(
            leftPadding - 80, 0); // 80 is AppDisplay.PAGE_PREVIEW_MAX_ARROW_OFFSET
    },
};

const BaseAppViewGridLayout = {
    _getIndicatorsWidth(box) {
        const [width, height] = box.get_size();
        const arrows = [
            this._nextPageArrow,
            this._previousPageArrow,
        ];

        const minArrowsWidth = arrows.reduce(
            (previousWidth, accessory) => {
                const [min] = accessory.get_preferred_width(height);
                return Math.max(previousWidth, min);
            }, 0);

        const idealIndicatorWidth = (width * 0.1/* PAGE_PREVIEW_RATIO*/) / 2;

        return Math.max(idealIndicatorWidth, minArrowsWidth);
    },
};

const FolderIcon = {
    after__init() {
        /* // If folder preview icons are clickable,
        // disable opening the folder with primary mouse button and enable the secondary one
         const buttonMask = opt.APP_GRID_ACTIVE_PREVIEW
            ? St.ButtonMask.TWO | St.ButtonMask.THREE
            : St.ButtonMask.ONE | St.ButtonMask.TWO;
        this.button_mask = buttonMask;*/
        this.button_mask = St.ButtonMask.ONE | St.ButtonMask.TWO;

        // build the folders now to avoid node errors when dragging active folder preview icons
        if (this.visible && opt.APP_GRID_ACTIVE_PREVIEW)
            this._ensureFolderDialog();
    },

    open() {
        this._ensureFolderDialog();
        if (this._dialog._designCapacity !== this.view._orderedItems.length)
            this._dialog._updateFolderSize();

        this.view._scrollView.vscroll.adjustment.value = 0;
        this._dialog.popup();
    },
};

const FolderView = {
    _createGrid() {
        let grid;
        if (shellVersion < 43)
            grid = new FolderGrid();
        else
            grid = new FolderGrid43();

        // IconGrid algorithm for adaptive icon size
        // counts with different default(max) size for folders
        grid.layoutManager._isFolder = true;
        return grid;
    },

    createFolderIcon(size) {
        const layout = new Clutter.GridLayout({
            row_homogeneous: true,
            column_homogeneous: true,
        });

        let icon = new St.Widget({
            layout_manager: layout,
            x_align: Clutter.ActorAlign.CENTER,
            style: `width: ${size}px; height: ${size}px;`,
        });

        const numItems = this._orderedItems.length;
        // decide what number of icons switch to 3x3 grid
        // APP_GRID_FOLDER_ICON_GRID: 3 -> more than 4
        //                          : 4 -> more than 8
        const threshold = opt.APP_GRID_FOLDER_ICON_GRID % 3 ? 8 : 4;
        const gridSize = opt.APP_GRID_FOLDER_ICON_GRID > 2 && numItems > threshold ? 3 : 2;
        const FOLDER_SUBICON_FRACTION = gridSize === 2 ? 0.4 : 0.27;

        let subSize = Math.floor(FOLDER_SUBICON_FRACTION * size);
        let rtl = icon.get_text_direction() === Clutter.TextDirection.RTL;
        for (let i = 0; i < gridSize * gridSize; i++) {
            const style = `width: ${subSize}px; height: ${subSize}px;`;
            let bin = new St.Bin({ style, reactive: true });
            bin.pivot_point = new Graphene.Point({ x: 0.5, y: 0.5 });
            if (i < numItems) {
                if (!opt.APP_GRID_ACTIVE_PREVIEW) {
                    bin.child = this._orderedItems[i].app.create_icon_texture(subSize);
                } else {
                    const app = this._orderedItems[i].app;
                    const child = new ActiveFolderIcon(app);
                    child._sourceItem = this._orderedItems[i];
                    child._sourceFolder = this;
                    child.icon.style_class = '';
                    child.icon.set_style('margin: 0; padding: 0;');
                    child.icon.setIconSize(subSize);

                    bin.child = child;

                    bin.connect('enter-event', () => {
                        bin.ease({
                            duration: 100,
                            scale_x: 1.14,
                            scale_y: 1.14,
                            mode: Clutter.AnimationMode.EASE_OUT_QUAD,
                        });
                    });
                    bin.connect('leave-event', () => {
                        bin.ease({
                            duration: 100,
                            scale_x: 1,
                            scale_y: 1,
                            mode: Clutter.AnimationMode.EASE_OUT_QUAD,
                        });
                    });
                }
            }

            layout.attach(bin, rtl ? (i + 1) % gridSize : i % gridSize, Math.floor(i / gridSize), 1, 1);
        }

        // if folder content changed, update folder size
        if (this._dialog && this._dialog._designCapacity !== this._orderedItems.length)
            this._dialog._updateFolderSize();

        return icon;
    },

    // this just overrides _redisplay() for GS < 44
    _redisplay() {
        // super._redisplay(); - super doesn't work in my overrides
        AppDisplay.BaseAppView.prototype._redisplay.bind(this)();
    },

    _loadApps() {
        this._apps = [];
        const excludedApps = this._folder.get_strv('excluded-apps');
        const appSys = Shell.AppSystem.get_default();
        const addAppId = appId => {
            if (excludedApps.includes(appId))
                return;

            if (opt.APP_GRID_EXCLUDE_FAVORITES && this._appFavorites.isFavorite(appId))
                return;

            const app = appSys.lookup_app(appId);
            if (!app)
                return;

            if (opt.APP_GRID_EXCLUDE_RUNNING) {
                const runningApps = Shell.AppSystem.get_default().get_running().map(a => a.id);
                if (runningApps.includes(appId))
                    return;
            }

            if (!this._parentalControlsManager.shouldShowApp(app.get_app_info()))
                return;

            if (this._apps.indexOf(app) !== -1)
                return;

            this._apps.push(app);
        };

        const folderApps = this._folder.get_strv('apps');
        folderApps.forEach(addAppId);

        const folderCategories = this._folder.get_strv('categories');
        const appInfos = this._parentView.getAppInfos();
        appInfos.forEach(appInfo => {
            let appCategories = AppDisplay._getCategories(appInfo);
            if (!AppDisplay._listsIntersect(folderCategories, appCategories))
                return;

            addAppId(appInfo.get_id());
        });

        let items = [];
        this._apps.forEach(app => {
            let icon = this._items.get(app.get_id());
            if (!icon)
                icon = new AppDisplay.AppIcon(app);

            items.push(icon);
        });
        this._appIds = this._apps.map(app => app.get_id());
        return items;
    },

    // 42 only - don't apply appGrid scale on folders
    adaptToSize(width, height) {
        if (!opt.ORIENTATION) {
            const [, indicatorHeight] = this._pageIndicators.get_preferred_height(-1);
            height -= indicatorHeight;
        }
        BaseAppViewCommon.adaptToSize.bind(this)(width, height, true);
    },
};

// folder columns and rows
const FolderGrid = GObject.registerClass(
class FolderGrid extends IconGrid.IconGrid {
    _init() {
        super._init({
            allow_incomplete_pages: false,
            // For adaptive size (0), set the numbers high enough to fit all the icons
            // to avoid splitting the icons to pages
            columns_per_page: opt.APP_GRID_FOLDER_COLUMNS ? opt.APP_GRID_FOLDER_COLUMNS : 20,
            rows_per_page: opt.APP_GRID_FOLDER_ROWS ? opt.APP_GRID_FOLDER_ROWS : 20,
            page_halign: Clutter.ActorAlign.CENTER,
            page_valign: Clutter.ActorAlign.CENTER,
        });

        // if (!opt.APP_GRID_FOLDER_DEFAULT)
        const spacing = opt.APP_GRID_SPACING;
        this.set_style(`column-spacing: ${spacing}px; row-spacing: ${spacing}px;`);
        this.layout_manager.fixedIconSize = opt.APP_GRID_FOLDER_ICON_SIZE;
    }

    adaptToSize(width, height) {
        this.layout_manager.adaptToSize(width, height);
    }
});


let FolderGrid43;
// first reference to constant defined using const in other module returns undefined, the AppGrid const will remain empty and unused
const AppGrid = AppDisplay.AppGrid;
if (AppDisplay.AppGrid) {
    FolderGrid43 = GObject.registerClass(
    class FolderGrid43 extends AppDisplay.AppGrid {
        _init() {
            super._init({
                allow_incomplete_pages: false,
                columns_per_page: opt.APP_GRID_FOLDER_COLUMNS ? opt.APP_GRID_FOLDER_COLUMNS : 20,
                rows_per_page: opt.APP_GRID_FOLDER_ROWS ? opt.APP_GRID_FOLDER_ROWS : 20,
                page_halign: Clutter.ActorAlign.CENTER,
                page_valign: Clutter.ActorAlign.CENTER,
            });

            const spacing = opt.APP_GRID_SPACING;
            this.set_style(`column-spacing: ${spacing}px; row-spacing: ${spacing}px;`);
            this.layout_manager.fixedIconSize = opt.APP_GRID_FOLDER_ICON_SIZE;

            this.setGridModes([
                {
                    columns: opt.APP_GRID_FOLDER_COLUMNS ? opt.APP_GRID_FOLDER_COLUMNS : 3,
                    rows: opt.APP_GRID_FOLDER_ROWS ? opt.APP_GRID_FOLDER_ROWS : 3,
                },
            ]);
        }

        adaptToSize(width, height) {
            this.layout_manager.adaptToSize(width, height);
        }
    });
}

const FOLDER_DIALOG_ANIMATION_TIME = 200; // AppDisplay.FOLDER_DIALOG_ANIMATION_TIME
const AppFolderDialog = {
    // injection to _init()
    after__init() {
        // delegate this dialog to the FolderIcon._view
        // so its _createFolderIcon function can update the dialog if folder content changed
        this._view._dialog = this;

        // right click into the folder popup should close it
        this.child.reactive = true;
        const clickAction = new Clutter.ClickAction();
        clickAction.connect('clicked', act => {
            if (act.get_button() === Clutter.BUTTON_PRIMARY)
                return Clutter.EVENT_STOP;
            const [x, y] = clickAction.get_coords();
            const actor = global.stage.get_actor_at_pos(Clutter.PickMode.ALL, x, y);
            // if it's not entry for editing folder title
            if (actor !== this._entry)
                this.popdown();
            return Clutter.EVENT_STOP;
        });

        this.child.add_action(clickAction);
    },

    popup() {
        if (this._isOpen)
            return;

        /* if (!this._correctSize) {
            // update folder with the precise app item size when the dialog is realized
            GLib.idle_add(0, () => this._updateFolderSize(true));
            this._correctSize = true;
        }*/

        this._isOpen = this._grabHelper.grab({
            actor: this,
            onUngrab: () => this.popdown(),
        });

        if (!this._isOpen)
            return;

        this.get_parent().set_child_above_sibling(this, null);

        this._needsZoomAndFade = true;
        this.show();

        this.emit('open-state-changed', true);
    },

    _updateFolderSize() {
        // adapt folder size according to the settings and number of icons
        const view = this._view;
        view._grid.layoutManager.fixedIconSize = opt.APP_GRID_FOLDER_ICON_SIZE;
        view._grid.set_style(`column-spacing: ${opt.APP_GRID_SPACING}px; row-spacing: ${opt.APP_GRID_SPACING}px;`);

        const { scaleFactor } = St.ThemeContext.get_for_stage(global.stage);
        const dialogMargin = 30;
        const nItems = view._orderedItems.length;
        let columns = opt.APP_GRID_FOLDER_COLUMNS;
        let rows = opt.APP_GRID_FOLDER_ROWS;
        let spacing = opt.APP_GRID_SPACING;
        const monitor = global.display.get_monitor_geometry(global.display.get_primary_monitor());

        if (!columns && !rows) {
            columns = Math.ceil(Math.sqrt(nItems));
            rows = columns;
            if (columns * (columns - 1) >= nItems) {
                rows = columns - 1;
            } else if ((columns + 1) * (columns - 1) >= nItems) {
                rows = columns - 1;
                columns += 1;
            }
        } else if (!columns && rows) {
            columns = Math.ceil(nItems / rows);
        } else if (columns && !rows) {
            rows = Math.ceil(nItems / columns);
        }

        const iconSize = opt.APP_GRID_FOLDER_ICON_SIZE < 0 ? opt.APP_GRID_FOLDER_ICON_SIZE_DEFAULT : opt.APP_GRID_FOLDER_ICON_SIZE;
        let itemSize = iconSize + 53; // icon padding
        // first run sets the grid before we can read the real icon size
        // so we estimate the size from default properties
        // and correct it in the second run
        if (this._notFirstRun) {
            const [firstItem] = view._grid.layoutManager._container;
            firstItem.icon.setIconSize(iconSize);
            const [firstItemWidth] = firstItem.get_preferred_size();
            const realSize = firstItemWidth / scaleFactor;
            if (realSize > iconSize)
                itemSize = realSize;
        } else {
            this._needsUpdateSize = true;
            this._notFirstRun = true;
        }


        let width = columns * (itemSize + spacing) + /* padding for nav arrows*/64;
        width = Math.round(width + (opt.ORIENTATION || !opt.APP_GRID_FOLDER_COLUMNS ? 100 : 160/* space for navigation arrows*/));
        let height = rows * (itemSize + spacing) + /* header*/75 + /* padding*/100;

        // folder must fit the primary monitor
        // reduce columns/rows if needed and count with the scaled values
        while (width * scaleFactor > monitor.width - 2 * dialogMargin) {
            width -= itemSize + spacing;
            columns -= 1;
        }
        while (height * scaleFactor > monitor.height - 2 * dialogMargin) {
            height -= itemSize + spacing;
            rows -= 1;
        }
        width = Math.max(540, width);

        const layoutManager = view._grid.layoutManager;
        layoutManager.rows_per_page = rows;
        layoutManager.columns_per_page = columns;

        // this line is required by GS 43
        view._grid.setGridModes([{ columns, rows }]);

        this.child.set_style(`
            width: ${width}px;
            height: ${height}px;
            padding: 30px;
        `);

        view._redisplay();

        // store original item count
        this._designCapacity = nItems;
    },

    _zoomAndFadeIn() {
        let [sourceX, sourceY] =
            this._source.get_transformed_position();
        let [dialogX, dialogY] =
            this.child.get_transformed_position();

        const sourceCenterX = sourceX + this._source.width / 2;
        const sourceCenterY = sourceY + this._source.height / 2;

        // this. covers the whole screen
        let dialogTargetX = dialogX;
        let dialogTargetY = dialogY;
        if (!opt.APP_GRID_FOLDER_CENTER) {
            const appDisplay = this._source._parentView;

            dialogTargetX = Math.round(sourceCenterX - this.child.width / 2);
            dialogTargetY = Math.round(sourceCenterY - this.child.height / 2);

            // keep the dialog in appDisplay area if possible
            dialogTargetX = Math.clamp(
                dialogTargetX,
                this.x + appDisplay.x,
                this.x + appDisplay.x + appDisplay.width - this.child.width
            );

            dialogTargetY = Math.clamp(
                dialogTargetY,
                this.y + appDisplay.y,
                this.y + appDisplay.y + appDisplay.height - this.child.height
            );
            // or at least in the monitor area
            const monitor = global.display.get_monitor_geometry(global.display.get_primary_monitor());
            dialogTargetX = Math.clamp(
                dialogTargetX,
                this.x + monitor.x,
                this.x + monitor.x + monitor.width - this.child.width
            );

            dialogTargetY = Math.clamp(
                dialogTargetY,
                this.y + monitor.y,
                this.y + monitor.y + monitor.height - this.child.height
            );
        }
        const dialogOffsetX = -dialogX + dialogTargetX;
        const dialogOffsetY = -dialogY + dialogTargetY;

        this.child.set({
            translation_x: sourceX - dialogX,
            translation_y: sourceY - dialogY,
            scale_x: this._source.width / this.child.width,
            scale_y: this._source.height / this.child.height,
            opacity: 0,
        });

        this.ease({
            background_color: DIALOG_SHADE_NORMAL,
            duration: FOLDER_DIALOG_ANIMATION_TIME,
            mode: Clutter.AnimationMode.EASE_OUT_QUAD,
        });

        this.child.ease({
            translation_x: dialogOffsetX,
            translation_y: dialogOffsetY,
            scale_x: 1,
            scale_y: 1,
            opacity: 255,
            duration: FOLDER_DIALOG_ANIMATION_TIME,
            mode: Clutter.AnimationMode.EASE_OUT_QUAD,
            onComplete: () => {
                // if the folder grid was build with the estimated icon item size because the real size wasn't available
                // rebuild it with the real size now, after the folder was realized
                if (this._needsUpdateSize) {
                    this._updateFolderSize();
                    this._view._redisplay();
                    this._needsUpdateSize = false;
                }
            },
        });

        this._needsZoomAndFade = false;

        if (this._sourceMappedId === 0) {
            this._sourceMappedId = this._source.connect(
                'notify::mapped', this._zoomAndFadeOut.bind(this));
        }
    },

    _zoomAndFadeOut() {
        if (!this._isOpen)
            return;

        if (!this._source.mapped) {
            this.hide();
            return;
        }

        let [sourceX, sourceY] =
            this._source.get_transformed_position();
        let [dialogX, dialogY] =
            this.child.get_transformed_position();

        this.ease({
            background_color: Clutter.Color.from_pixel(0x00000000),
            duration: FOLDER_DIALOG_ANIMATION_TIME,
            mode: Clutter.AnimationMode.EASE_OUT_QUAD,
        });

        this.child.ease({
            translation_x: sourceX - dialogX + this.child.translation_x,
            translation_y: sourceY - dialogY + this.child.translation_y,
            scale_x: this._source.width / this.child.width,
            scale_y: this._source.height / this.child.height,
            opacity: 0,
            duration: FOLDER_DIALOG_ANIMATION_TIME,
            mode: Clutter.AnimationMode.EASE_OUT_QUAD,
            onComplete: () => {
                this.child.set({
                    translation_x: 0,
                    translation_y: 0,
                    scale_x: 1,
                    scale_y: 1,
                    opacity: 255,
                });
                this.hide();

                this._popdownCallbacks.forEach(func => func());
                this._popdownCallbacks = [];
            },
        });

        this._needsZoomAndFade = false;
    },

    _setLighterBackground(lighter) {
        const backgroundColor = lighter
            ? DIALOG_SHADE_HIGHLIGHT
            : DIALOG_SHADE_NORMAL;

        this.ease({
            backgroundColor,
            duration: FOLDER_DIALOG_ANIMATION_TIME,
            mode: Clutter.AnimationMode.EASE_OUT_QUAD,
        });
    },
};

// just make app grid to update all invalid positions that may be result of grid/icon size change
function _updateIconPositions() {
    const appDisplay = Main.overview._overview._controls._appDisplay;
    const icons = [...appDisplay._orderedItems];
    for (let i = 0; i < icons.length; i++)
        appDisplay._moveItem(icons[i], -1, -1);
}

function _removeIcons() {
    const appDisplay = Main.overview._overview._controls._appDisplay;
    const icons = [...appDisplay._orderedItems];
    for (let i = 0; i < icons.length; i++) {
        const icon = icons[i];
        if (icon._dialog)
            Main.layoutManager.overviewGroup.remove_child(icon._dialog);
        appDisplay._removeItem(icon);
        icon.destroy();
    }
    appDisplay._folderIcons = [];
}

function _resetAppGrid(settings) {
    const appDisplay = Main.overview._overview._controls._appDisplay;
    // reset the grid only if called directly without args or if all folders where removed by using reset button in Settings window
    // otherwise this function is called every time a user moves icon to another position as a settings callback
    if (settings) {
        const currentValue = JSON.stringify(global.settings.get_value('app-picker-layout').deep_unpack());
        const emptyValue = JSON.stringify([]);
        const customLayout = currentValue !== emptyValue;
        // appDisplay._customLayout = customLayout;
        if (customLayout)
            return;
        else
            opt._appGridNeedsRedisplay = true;
    }

    // force update icon size using adaptToSize(). the page size cannot be the same as the current one
    appDisplay._grid.layoutManager._pageWidth += 1;
    appDisplay._grid.layoutManager.adaptToSize(appDisplay._grid.layoutManager._pageWidth - 1, appDisplay._grid.layoutManager._pageHeight);
    _removeIcons();
    appDisplay._redisplay();
    // force appDisplay to move all icons to proper positions and update all properties
    GLib.idle_add(0, () => {
        _updateIconPositions();
        if (appDisplay._sortOrderedItemsAlphabetically) {
            appDisplay._sortOrderedItemsAlphabetically();
            appDisplay._grid.layoutManager._pageWidth += 1;
            appDisplay._grid.layoutManager.adaptToSize(appDisplay._grid.layoutManager._pageWidth - 1, appDisplay._grid.layoutManager._pageHeight);
            appDisplay._setLinearPositions(appDisplay._orderedItems);
        } else {
            appDisplay._removeItem(appDisplay._orderedItems[0]);
            appDisplay._redisplay();
        }

        appDisplay._redisplay();
    });
}

function _getWindowApp(metaWin) {
    const tracker = Shell.WindowTracker.get_default();
    return tracker.get_window_app(metaWin);
}

function _getAppLastUsedWindow(app) {
    let recentWin;
    global.display.get_tab_list(Meta.TabList.NORMAL_ALL, null).forEach(metaWin => {
        const winApp = _getWindowApp(metaWin);
        if (!recentWin && winApp === app)
            recentWin = metaWin;
    });
    return recentWin;
}

function _getAppRecentWorkspace(app) {
    const recentWin = _getAppLastUsedWindow(app);
    if (recentWin)
        return recentWin.get_workspace();

    return null;
}

const AppIcon = {
    after__init() {
        // update the app label behavior
        this._updateMultiline();
    },

    // avoid accepting by placeholder when dragging active preview
    // and also by icon if alphabet or usage sorting are used
    _canAccept(source) {
        if (source._sourceItem)
            source = source._sourceItem;
        let view = AppDisplay._getViewFromIcon(source);

        return source !== this &&
               (source instanceof this.constructor) &&
               (view instanceof AppDisplay.AppDisplay &&
                !opt.APP_GRID_ORDER);
    },
};

const AppViewItemCommon = {
    _updateMultiline() {
        const { label } = this.icon;
        if (label)
            label.opacity = 255;
        if (!this._expandTitleOnHover || !this.icon.label)
            return;

        const { clutterText } = label;

        const isHighlighted = this.has_key_focus() || this.hover || this._forcedHighlight;

        if (opt.APP_GRID_NAMES_MODE === 2 && this._expandTitleOnHover) { // !_expandTitleOnHover indicates search result icon
            label.opacity = isHighlighted || !this.app ? 255 : 0;
        }
        if (isHighlighted)
            this.get_parent()?.set_child_above_sibling(this, null);

        if (!opt.APP_GRID_NAMES_MODE) {
            const layout = clutterText.get_layout();
            if (!layout.is_wrapped() && !layout.is_ellipsized())
                return;
        }

        label.remove_transition('allocation');

        const id = label.connect('notify::allocation', () => {
            label.restore_easing_state();
            label.disconnect(id);
        });

        const expand = opt.APP_GRID_NAMES_MODE === 1 || this._forcedHighlight || this.hover || this.has_key_focus();

        label.save_easing_state();
        label.set_easing_duration(expand
            ? AppDisplay.APP_ICON_TITLE_EXPAND_TIME
            : AppDisplay.APP_ICON_TITLE_COLLAPSE_TIME);
        clutterText.set({
            line_wrap: expand,
            line_wrap_mode: expand ? Pango.WrapMode.WORD_CHAR : Pango.WrapMode.NONE,
            ellipsize: expand ? Pango.EllipsizeMode.NONE : Pango.EllipsizeMode.END,
        });
    },

    // support active preview icons
    acceptDrop(source, _actor, x) {
        if (opt.APP_GRID_ORDER)
            return DND.DragMotionResult.NO_DROP;

        this._setHoveringByDnd(false);

        if (!this._canAccept(source))
            return false;

        if (this._withinLeeways(x))
            return false;

        // added - remove app from the source folder after dnd to other folder
        if (source._sourceItem) {
            const app = source._sourceItem.app;
            source._sourceFolder.removeApp(app);
        }

        return true;
    },

};

const ActiveFolderIcon = GObject.registerClass(
class ActiveFolderIcon extends AppDisplay.AppIcon {
    _init(app) {
        super._init(app, {
            setSizeManually: true,
            showLabel: false,
        });
    }

    handleDragOver() {
        return DND.DragMotionResult.CONTINUE;
    }

    acceptDrop() {
        return false;
    }

    _onDragEnd() {
        this._dragging = false;
        this.undoScaleAndFade();
        Main.overview.endItemDrag(this._sourceItem.icon);
    }
});