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
|
/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qitemselectionmodel.h"
#include <private/qitemselectionmodel_p.h>
#include <qdebug.h>
#ifndef QT_NO_ITEMVIEWS
QT_BEGIN_NAMESPACE
/*!
\class QItemSelectionRange
\brief The QItemSelectionRange class manages information about a
range of selected items in a model.
\ingroup model-view
A QItemSelectionRange contains information about a range of
selected items in a model. A range of items is a contiguous array
of model items, extending to cover a number of adjacent rows and
columns with a common parent item; this can be visualized as a
two-dimensional block of cells in a table. A selection range has a
top(), left() a bottom(), right() and a parent().
The QItemSelectionRange class is one of the \l{Model/View Classes}
and is part of Qt's \l{Model/View Programming}{model/view framework}.
The model items contained in the selection range can be obtained
using the indexes() function. Use QItemSelectionModel::selectedIndexes()
to get a list of all selected items for a view.
You can determine whether a given model item lies within a
particular range by using the contains() function. Ranges can also
be compared using the overloaded operators for equality and
inequality, and the intersects() function allows you to determine
whether two ranges overlap.
\sa {Model/View Programming}, QAbstractItemModel, QItemSelection,
QItemSelectionModel
*/
/*!
\fn QItemSelectionRange::QItemSelectionRange()
Constructs an empty selection range.
*/
/*!
\fn QItemSelectionRange::QItemSelectionRange(const QItemSelectionRange &other)
Copy constructor. Constructs a new selection range with the same contents
as the \a other range given.
*/
/*!
\fn QItemSelectionRange::QItemSelectionRange(const QModelIndex &topLeft, const QModelIndex &bottomRight)
Constructs a new selection range containing only the index specified
by the \a topLeft and the index \a bottomRight.
*/
/*!
\fn QItemSelectionRange::QItemSelectionRange(const QModelIndex &index)
Constructs a new selection range containing only the model item specified
by the model index \a index.
*/
/*!
\fn int QItemSelectionRange::top() const
Returns the row index corresponding to the uppermost selected row in the
selection range.
*/
/*!
\fn int QItemSelectionRange::left() const
Returns the column index corresponding to the leftmost selected column in the
selection range.
*/
/*!
\fn int QItemSelectionRange::bottom() const
Returns the row index corresponding to the lowermost selected row in the
selection range.
*/
/*!
\fn int QItemSelectionRange::right() const
Returns the column index corresponding to the rightmost selected column in
the selection range.
*/
/*!
\fn int QItemSelectionRange::width() const
Returns the number of selected columns in the selection range.
*/
/*!
\fn int QItemSelectionRange::height() const
Returns the number of selected rows in the selection range.
*/
/*!
\fn const QAbstractItemModel *QItemSelectionRange::model() const
Returns the model that the items in the selection range belong to.
*/
/*!
\fn QModelIndex QItemSelectionRange::topLeft() const
Returns the index for the item located at the top-left corner of
the selection range.
\sa top(), left(), bottomRight()
*/
/*!
\fn QModelIndex QItemSelectionRange::bottomRight() const
Returns the index for the item located at the bottom-right corner
of the selection range.
\sa bottom(), right(), topLeft()
*/
/*!
\fn QModelIndex QItemSelectionRange::parent() const
Returns the parent model item index of the items in the selection range.
*/
/*!
\fn bool QItemSelectionRange::contains(const QModelIndex &index) const
Returns true if the model item specified by the \a index lies within the
range of selected items; otherwise returns false.
*/
/*!
\fn bool QItemSelectionRange::contains(int row, int column,
const QModelIndex &parentIndex) const
\overload
Returns true if the model item specified by (\a row, \a column)
and with \a parentIndex as the parent item lies within the range
of selected items; otherwise returns false.
*/
/*!
\fn bool QItemSelectionRange::intersects(const QItemSelectionRange &other) const
Returns true if this selection range intersects (overlaps with) the \a other
range given; otherwise returns false.
*/
bool QItemSelectionRange::intersects(const QItemSelectionRange &other) const
{
return (isValid() && other.isValid()
&& parent() == other.parent()
&& model() == other.model()
&& ((top() <= other.top() && bottom() >= other.top())
|| (top() >= other.top() && top() <= other.bottom()))
&& ((left() <= other.left() && right() >= other.left())
|| (left() >= other.left() && left() <= other.right())));
}
/*!
\fn QItemSelectionRange QItemSelectionRange::intersect(const QItemSelectionRange &other) const
\obsolete
Use intersected(\a other) instead.
*/
/*!
\fn QItemSelectionRange QItemSelectionRange::intersected(const QItemSelectionRange &other) const
\since 4.2
Returns a new selection range containing only the items that are found in
both the selection range and the \a other selection range.
*/
QItemSelectionRange QItemSelectionRange::intersect(const QItemSelectionRange &other) const
{
if (model() == other.model() && parent() == other.parent()) {
QModelIndex topLeft = model()->index(qMax(top(), other.top()),
qMax(left(), other.left()),
other.parent());
QModelIndex bottomRight = model()->index(qMin(bottom(), other.bottom()),
qMin(right(), other.right()),
other.parent());
return QItemSelectionRange(topLeft, bottomRight);
}
return QItemSelectionRange();
}
/*!
\fn bool QItemSelectionRange::operator==(const QItemSelectionRange &other) const
Returns true if the selection range is exactly the same as the \a other
range given; otherwise returns false.
*/
/*!
\fn bool QItemSelectionRange::operator!=(const QItemSelectionRange &other) const
Returns true if the selection range differs from the \a other range given;
otherwise returns false.
*/
/*!
\fn bool QItemSelectionRange::isValid() const
Returns true if the selection range is valid; otherwise returns false.
*/
/*
\internal
utility function for getting the indexes from a range
it avoid concatenating list and works on one
*/
static void indexesFromRange(const QItemSelectionRange &range, QModelIndexList &result)
{
if (range.isValid() && range.model()) {
for (int column = range.left(); column <= range.right(); ++column) {
for (int row = range.top(); row <= range.bottom(); ++row) {
QModelIndex index = range.model()->index(row, column, range.parent());
Qt::ItemFlags flags = range.model()->flags(index);
if ((flags & Qt::ItemIsSelectable) && (flags & Qt::ItemIsEnabled))
result.append(index);
}
}
}
}
/*!
Returns true if the selection range contains no selectable item
\since 4.7
*/
bool QItemSelectionRange::isEmpty() const
{
if (!isValid() || !model())
return true;
for (int column = left(); column <= right(); ++column) {
for (int row = top(); row <= bottom(); ++row) {
QModelIndex index = model()->index(row, column, parent());
Qt::ItemFlags flags = model()->flags(index);
if ((flags & Qt::ItemIsSelectable) && (flags & Qt::ItemIsEnabled))
return false;
}
}
return true;
}
/*!
Returns the list of model index items stored in the selection.
*/
QModelIndexList QItemSelectionRange::indexes() const
{
QModelIndexList result;
indexesFromRange(*this, result);
return result;
}
/*!
\class QItemSelection
\brief The QItemSelection class manages information about selected items in a model.
\ingroup model-view
A QItemSelection describes the items in a model that have been
selected by the user. A QItemSelection is basically a list of
selection ranges, see QItemSelectionRange. It provides functions for
creating and manipulating selections, and selecting a range of items
from a model.
The QItemSelection class is one of the \l{Model/View Classes}
and is part of Qt's \l{Model/View Programming}{model/view framework}.
An item selection can be constructed and initialized to contain a
range of items from an existing model. The following example constructs
a selection that contains a range of items from the given \c model,
beginning at the \c topLeft, and ending at the \c bottomRight.
\snippet doc/src/snippets/code/src_gui_itemviews_qitemselectionmodel.cpp 0
An empty item selection can be constructed, and later populated as
required. So, if the model is going to be unavailable when we construct
the item selection, we can rewrite the above code in the following way:
\snippet doc/src/snippets/code/src_gui_itemviews_qitemselectionmodel.cpp 1
QItemSelection saves memory, and avoids unnecessary work, by working with
selection ranges rather than recording the model item index for each
item in the selection. Generally, an instance of this class will contain
a list of non-overlapping selection ranges.
Use merge() to merge one item selection into another without making
overlapping ranges. Use split() to split one selection range into
smaller ranges based on a another selection range.
\sa {Model/View Programming}, QItemSelectionModel
*/
/*!
\fn QItemSelection::QItemSelection()
Constructs an empty selection.
*/
/*!
Constructs an item selection that extends from the top-left model item,
specified by the \a topLeft index, to the bottom-right item, specified
by \a bottomRight.
*/
QItemSelection::QItemSelection(const QModelIndex &topLeft, const QModelIndex &bottomRight)
{
select(topLeft, bottomRight);
}
/*!
Adds the items in the range that extends from the top-left model
item, specified by the \a topLeft index, to the bottom-right item,
specified by \a bottomRight to the list.
\note \a topLeft and \a bottomRight must have the same parent.
*/
void QItemSelection::select(const QModelIndex &topLeft, const QModelIndex &bottomRight)
{
if (!topLeft.isValid() || !bottomRight.isValid())
return;
if ((topLeft.model() != bottomRight.model())
|| topLeft.parent() != bottomRight.parent()) {
qWarning("Can't select indexes from different model or with different parents");
return;
}
if (topLeft.row() > bottomRight.row() || topLeft.column() > bottomRight.column()) {
int top = qMin(topLeft.row(), bottomRight.row());
int bottom = qMax(topLeft.row(), bottomRight.row());
int left = qMin(topLeft.column(), bottomRight.column());
int right = qMax(topLeft.column(), bottomRight.column());
QModelIndex tl = topLeft.sibling(top, left);
QModelIndex br = bottomRight.sibling(bottom, right);
append(QItemSelectionRange(tl, br));
return;
}
append(QItemSelectionRange(topLeft, bottomRight));
}
/*!
Returns true if the selection contains the given \a index; otherwise
returns false.
*/
bool QItemSelection::contains(const QModelIndex &index) const
{
if (index.flags() & Qt::ItemIsSelectable) {
QList<QItemSelectionRange>::const_iterator it = begin();
for (; it != end(); ++it)
if ((*it).contains(index))
return true;
}
return false;
}
/*!
Returns a list of model indexes that correspond to the selected items.
*/
QModelIndexList QItemSelection::indexes() const
{
QModelIndexList result;
QList<QItemSelectionRange>::const_iterator it = begin();
for (; it != end(); ++it)
indexesFromRange(*it, result);
return result;
}
/*!
Merges the \a other selection with this QItemSelection using the
\a command given. This method guarantees that no ranges are overlapping.
Note that only QItemSelectionModel::Select,
QItemSelectionModel::Deselect, and QItemSelectionModel::Toggle are
supported.
\sa split()
*/
void QItemSelection::merge(const QItemSelection &other, QItemSelectionModel::SelectionFlags command)
{
if (other.isEmpty() ||
!(command & QItemSelectionModel::Select ||
command & QItemSelectionModel::Deselect ||
command & QItemSelectionModel::Toggle))
return;
QItemSelection newSelection = other;
// Collect intersections
QItemSelection intersections;
QItemSelection::iterator it = newSelection.begin();
while (it != newSelection.end()) {
if (!(*it).isValid()) {
it = newSelection.erase(it);
continue;
}
for (int t = 0; t < count(); ++t) {
if ((*it).intersects(at(t)))
intersections.append(at(t).intersected(*it));
}
++it;
}
// Split the old (and new) ranges using the intersections
for (int i = 0; i < intersections.count(); ++i) { // for each intersection
for (int t = 0; t < count();) { // splitt each old range
if (at(t).intersects(intersections.at(i))) {
split(at(t), intersections.at(i), this);
removeAt(t);
} else {
++t;
}
}
// only split newSelection if Toggle is specified
for (int n = 0; (command & QItemSelectionModel::Toggle) && n < newSelection.count();) {
if (newSelection.at(n).intersects(intersections.at(i))) {
split(newSelection.at(n), intersections.at(i), &newSelection);
newSelection.removeAt(n);
} else {
++n;
}
}
}
// do not add newSelection for Deselect
if (!(command & QItemSelectionModel::Deselect))
operator+=(newSelection);
}
/*!
Splits the selection \a range using the selection \a other range.
Removes all items in \a other from \a range and puts the result in \a result.
This can be compared with the semantics of the \e subtract operation of a set.
\sa merge()
*/
void QItemSelection::split(const QItemSelectionRange &range,
const QItemSelectionRange &other, QItemSelection *result)
{
if (range.parent() != other.parent() || range.model() != other.model())
return;
QModelIndex parent = other.parent();
int top = range.top();
int left = range.left();
int bottom = range.bottom();
int right = range.right();
int other_top = other.top();
int other_left = other.left();
int other_bottom = other.bottom();
int other_right = other.right();
const QAbstractItemModel *model = range.model();
Q_ASSERT(model);
if (other_top > top) {
QModelIndex tl = model->index(top, left, parent);
QModelIndex br = model->index(other_top - 1, right, parent);
result->append(QItemSelectionRange(tl, br));
top = other_top;
}
if (other_bottom < bottom) {
QModelIndex tl = model->index(other_bottom + 1, left, parent);
QModelIndex br = model->index(bottom, right, parent);
result->append(QItemSelectionRange(tl, br));
bottom = other_bottom;
}
if (other_left > left) {
QModelIndex tl = model->index(top, left, parent);
QModelIndex br = model->index(bottom, other_left - 1, parent);
result->append(QItemSelectionRange(tl, br));
left = other_left;
}
if (other_right < right) {
QModelIndex tl = model->index(top, other_right + 1, parent);
QModelIndex br = model->index(bottom, right, parent);
result->append(QItemSelectionRange(tl, br));
right = other_right;
}
}
void QItemSelectionModelPrivate::initModel(QAbstractItemModel *model)
{
this->model = model;
if (model) {
Q_Q(QItemSelectionModel);
QObject::connect(model, SIGNAL(rowsAboutToBeRemoved(QModelIndex,int,int)),
q, SLOT(_q_rowsAboutToBeRemoved(QModelIndex,int,int)));
QObject::connect(model, SIGNAL(columnsAboutToBeRemoved(QModelIndex,int,int)),
q, SLOT(_q_columnsAboutToBeRemoved(QModelIndex,int,int)));
QObject::connect(model, SIGNAL(rowsAboutToBeInserted(QModelIndex,int,int)),
q, SLOT(_q_rowsAboutToBeInserted(QModelIndex,int,int)));
QObject::connect(model, SIGNAL(columnsAboutToBeInserted(QModelIndex,int,int)),
q, SLOT(_q_columnsAboutToBeInserted(QModelIndex,int,int)));
QObject::connect(model, SIGNAL(layoutAboutToBeChanged()),
q, SLOT(_q_layoutAboutToBeChanged()));
QObject::connect(model, SIGNAL(layoutChanged()),
q, SLOT(_q_layoutChanged()));
}
}
/*!
\internal
returns a QItemSelection where all ranges have been expanded to:
Rows: left: 0 and right: columnCount()-1
Columns: top: 0 and bottom: rowCount()-1
*/
QItemSelection QItemSelectionModelPrivate::expandSelection(const QItemSelection &selection,
QItemSelectionModel::SelectionFlags command) const
{
if (selection.isEmpty() && !((command & QItemSelectionModel::Rows) ||
(command & QItemSelectionModel::Columns)))
return selection;
QItemSelection expanded;
if (command & QItemSelectionModel::Rows) {
for (int i = 0; i < selection.count(); ++i) {
QModelIndex parent = selection.at(i).parent();
int colCount = model->columnCount(parent);
QModelIndex tl = model->index(selection.at(i).top(), 0, parent);
QModelIndex br = model->index(selection.at(i).bottom(), colCount - 1, parent);
//we need to merge because the same row could have already been inserted
expanded.merge(QItemSelection(tl, br), QItemSelectionModel::Select);
}
}
if (command & QItemSelectionModel::Columns) {
for (int i = 0; i < selection.count(); ++i) {
QModelIndex parent = selection.at(i).parent();
int rowCount = model->rowCount(parent);
QModelIndex tl = model->index(0, selection.at(i).left(), parent);
QModelIndex br = model->index(rowCount - 1, selection.at(i).right(), parent);
//we need to merge because the same column could have already been inserted
expanded.merge(QItemSelection(tl, br), QItemSelectionModel::Select);
}
}
return expanded;
}
/*!
\internal
*/
void QItemSelectionModelPrivate::_q_rowsAboutToBeRemoved(const QModelIndex &parent,
int start, int end)
{
Q_Q(QItemSelectionModel);
finalize();
// update current index
if (currentIndex.isValid() && parent == currentIndex.parent()
&& currentIndex.row() >= start && currentIndex.row() <= end) {
QModelIndex old = currentIndex;
if (start > 0) // there are rows left above the change
currentIndex = model->index(start - 1, old.column(), parent);
else if (model && end < model->rowCount(parent) - 1) // there are rows left below the change
currentIndex = model->index(end + 1, old.column(), parent);
else // there are no rows left in the table
currentIndex = QModelIndex();
emit q->currentChanged(currentIndex, old);
emit q->currentRowChanged(currentIndex, old);
if (currentIndex.column() != old.column())
emit q->currentColumnChanged(currentIndex, old);
}
QItemSelection deselected;
QItemSelection newParts;
QItemSelection::iterator it = ranges.begin();
while (it != ranges.end()) {
if (it->topLeft().parent() != parent) { // Check parents until reaching root or contained in range
QModelIndex itParent = it->topLeft().parent();
while (itParent.isValid() && itParent.parent() != parent)
itParent = itParent.parent();
if (itParent.isValid() && start <= itParent.row() && itParent.row() <= end) {
deselected.append(*it);
it = ranges.erase(it);
} else {
++it;
}
} else if (start <= it->bottom() && it->bottom() <= end // Full inclusion
&& start <= it->top() && it->top() <= end) {
deselected.append(*it);
it = ranges.erase(it);
} else if (start <= it->top() && it->top() <= end) { // Top intersection
deselected.append(QItemSelectionRange(it->topLeft(), model->index(end, it->left(), it->parent())));
*it = QItemSelectionRange(model->index(end + 1, it->left(), it->parent()), it->bottomRight());
++it;
} else if (start <= it->bottom() && it->bottom() <= end) { // Bottom intersection
deselected.append(QItemSelectionRange(model->index(start, it->right(), it->parent()), it->bottomRight()));
*it = QItemSelectionRange(it->topLeft(), model->index(start - 1, it->right(), it->parent()));
++it;
} else if (it->top() < start && end < it->bottom()) { // Middle intersection
// If the parent contains (1, 2, 3, 4, 5, 6, 7, 8) and [3, 4, 5, 6] is selected,
// and [4, 5] is removed, we need to split [3, 4, 5, 6] into [3], [4, 5] and [6].
// [4, 5] is appended to deselected, and [3] and [6] remain part of the selection
// in ranges.
const QItemSelectionRange removedRange(model->index(start, it->right(), it->parent()),
model->index(end, it->left(), it->parent()));
deselected.append(removedRange);
QItemSelection::split(*it, removedRange, &newParts);
it = ranges.erase(it);
} else
++it;
}
ranges.append(newParts);
if (!deselected.isEmpty())
emit q->selectionChanged(QItemSelection(), deselected);
}
/*!
\internal
*/
void QItemSelectionModelPrivate::_q_columnsAboutToBeRemoved(const QModelIndex &parent,
int start, int end)
{
Q_Q(QItemSelectionModel);
// update current index
if (currentIndex.isValid() && parent == currentIndex.parent()
&& currentIndex.column() >= start && currentIndex.column() <= end) {
QModelIndex old = currentIndex;
if (start > 0) // there are columns to the left of the change
currentIndex = model->index(old.row(), start - 1, parent);
else if (model && end < model->columnCount() - 1) // there are columns to the right of the change
currentIndex = model->index(old.row(), end + 1, parent);
else // there are no columns left in the table
currentIndex = QModelIndex();
emit q->currentChanged(currentIndex, old);
if (currentIndex.row() != old.row())
emit q->currentRowChanged(currentIndex, old);
emit q->currentColumnChanged(currentIndex, old);
}
// update selections
QModelIndex tl = model->index(0, start, parent);
QModelIndex br = model->index(model->rowCount(parent) - 1, end, parent);
q->select(QItemSelection(tl, br), QItemSelectionModel::Deselect);
finalize();
}
/*!
\internal
Split selection ranges if columns are about to be inserted in the middle.
*/
void QItemSelectionModelPrivate::_q_columnsAboutToBeInserted(const QModelIndex &parent,
int start, int end)
{
Q_UNUSED(end);
finalize();
QList<QItemSelectionRange> split;
QList<QItemSelectionRange>::iterator it = ranges.begin();
for (; it != ranges.end(); ) {
if ((*it).isValid() && (*it).parent() == parent
&& (*it).left() < start && (*it).right() >= start) {
QModelIndex bottomMiddle = model->index((*it).bottom(), start - 1, (*it).parent());
QItemSelectionRange left((*it).topLeft(), bottomMiddle);
QModelIndex topMiddle = model->index((*it).top(), start, (*it).parent());
QItemSelectionRange right(topMiddle, (*it).bottomRight());
it = ranges.erase(it);
split.append(left);
split.append(right);
} else {
++it;
}
}
ranges += split;
}
/*!
\internal
Split selection ranges if rows are about to be inserted in the middle.
*/
void QItemSelectionModelPrivate::_q_rowsAboutToBeInserted(const QModelIndex &parent,
int start, int end)
{
Q_UNUSED(end);
finalize();
QList<QItemSelectionRange> split;
QList<QItemSelectionRange>::iterator it = ranges.begin();
for (; it != ranges.end(); ) {
if ((*it).isValid() && (*it).parent() == parent
&& (*it).top() < start && (*it).bottom() >= start) {
QModelIndex middleRight = model->index(start - 1, (*it).right(), (*it).parent());
QItemSelectionRange top((*it).topLeft(), middleRight);
QModelIndex middleLeft = model->index(start, (*it).left(), (*it).parent());
QItemSelectionRange bottom(middleLeft, (*it).bottomRight());
it = ranges.erase(it);
split.append(top);
split.append(bottom);
} else {
++it;
}
}
ranges += split;
}
/*!
\internal
Split selection into individual (persistent) indexes. This is done in
preparation for the layoutChanged() signal, where the indexes can be
merged again.
*/
void QItemSelectionModelPrivate::_q_layoutAboutToBeChanged()
{
savedPersistentIndexes.clear();
savedPersistentCurrentIndexes.clear();
// optimization for when all indexes are selected
// (only if there is lots of items (1000) because this is not entirely correct)
if (ranges.isEmpty() && currentSelection.count() == 1) {
QItemSelectionRange range = currentSelection.first();
QModelIndex parent = range.parent();
tableRowCount = model->rowCount(parent);
tableColCount = model->columnCount(parent);
if (tableRowCount * tableColCount > 1000
&& range.top() == 0
&& range.left() == 0
&& range.bottom() == tableRowCount - 1
&& range.right() == tableColCount - 1) {
tableSelected = true;
tableParent = parent;
return;
}
}
tableSelected = false;
QModelIndexList indexes = ranges.indexes();
QModelIndexList::const_iterator it;
for (it = indexes.constBegin(); it != indexes.constEnd(); ++it)
savedPersistentIndexes.append(QPersistentModelIndex(*it));
indexes = currentSelection.indexes();
for (it = indexes.constBegin(); it != indexes.constEnd(); ++it)
savedPersistentCurrentIndexes.append(QPersistentModelIndex(*it));
}
/*!
\internal
Merges \a indexes into an item selection made up of ranges.
Assumes that the indexes are sorted.
*/
static QItemSelection mergeIndexes(const QList<QPersistentModelIndex> &indexes)
{
QItemSelection colSpans;
// merge columns
int i = 0;
while (i < indexes.count()) {
QModelIndex tl = indexes.at(i);
QModelIndex br = tl;
while (++i < indexes.count()) {
QModelIndex next = indexes.at(i);
if ((next.parent() == br.parent())
&& (next.row() == br.row())
&& (next.column() == br.column() + 1))
br = next;
else
break;
}
colSpans.append(QItemSelectionRange(tl, br));
}
// merge rows
QItemSelection rowSpans;
i = 0;
while (i < colSpans.count()) {
QModelIndex tl = colSpans.at(i).topLeft();
QModelIndex br = colSpans.at(i).bottomRight();
QModelIndex prevTl = tl;
while (++i < colSpans.count()) {
QModelIndex nextTl = colSpans.at(i).topLeft();
QModelIndex nextBr = colSpans.at(i).bottomRight();
if (nextTl.parent() != tl.parent())
break; // we can't merge selection ranges from different parents
if ((nextTl.column() == prevTl.column()) && (nextBr.column() == br.column())
&& (nextTl.row() == prevTl.row() + 1) && (nextBr.row() == br.row() + 1)) {
br = nextBr;
prevTl = nextTl;
} else {
break;
}
}
rowSpans.append(QItemSelectionRange(tl, br));
}
return rowSpans;
}
/*!
\internal
Merge the selected indexes into selection ranges again.
*/
void QItemSelectionModelPrivate::_q_layoutChanged()
{
// special case for when all indexes are selected
if (tableSelected && tableColCount == model->columnCount(tableParent)
&& tableRowCount == model->rowCount(tableParent)) {
ranges.clear();
currentSelection.clear();
int bottom = tableRowCount - 1;
int right = tableColCount - 1;
QModelIndex tl = model->index(0, 0, tableParent);
QModelIndex br = model->index(bottom, right, tableParent);
currentSelection << QItemSelectionRange(tl, br);
tableParent = QModelIndex();
tableSelected = false;
return;
}
if (savedPersistentCurrentIndexes.isEmpty() && savedPersistentIndexes.isEmpty()) {
// either the selection was actually empty, or we
// didn't get the layoutAboutToBeChanged() signal
return;
}
// clear the "old" selection
ranges.clear();
currentSelection.clear();
// sort the "new" selection, as preparation for merging
qStableSort(savedPersistentIndexes.begin(), savedPersistentIndexes.end());
qStableSort(savedPersistentCurrentIndexes.begin(), savedPersistentCurrentIndexes.end());
// update the selection by merging the individual indexes
ranges = mergeIndexes(savedPersistentIndexes);
currentSelection = mergeIndexes(savedPersistentCurrentIndexes);
// release the persistent indexes
savedPersistentIndexes.clear();
savedPersistentCurrentIndexes.clear();
}
/*!
\class QItemSelectionModel
\brief The QItemSelectionModel class keeps track of a view's selected items.
\ingroup model-view
A QItemSelectionModel keeps track of the selected items in a view, or
in several views onto the same model. It also keeps track of the
currently selected item in a view.
The QItemSelectionModel class is one of the \l{Model/View Classes}
and is part of Qt's \l{Model/View Programming}{model/view framework}.
The selected items are stored using ranges. Whenever you want to
modify the selected items use select() and provide either a
QItemSelection, or a QModelIndex and a QItemSelectionModel::SelectionFlag.
The QItemSelectionModel takes a two layer approach to selection
management, dealing with both selected items that have been committed
and items that are part of the current selection. The current
selected items are part of the current interactive selection (for
example with rubber-band selection or keyboard-shift selections).
To update the currently selected items, use the bitwise OR of
QItemSelectionModel::Current and any of the other SelectionFlags.
If you omit the QItemSelectionModel::Current command, a new current
selection will be created, and the previous one added to the whole
selection. All functions operate on both layers; for example,
selectedItems() will return items from both layers.
\sa {Model/View Programming}, QAbstractItemModel, {Chart Example}
*/
/*!
Constructs a selection model that operates on the specified item \a model.
*/
QItemSelectionModel::QItemSelectionModel(QAbstractItemModel *model)
: QObject(*new QItemSelectionModelPrivate, model)
{
d_func()->initModel(model);
}
/*!
Constructs a selection model that operates on the specified item \a model with \a parent.
*/
QItemSelectionModel::QItemSelectionModel(QAbstractItemModel *model, QObject *parent)
: QObject(*new QItemSelectionModelPrivate, parent)
{
d_func()->initModel(model);
}
/*!
\internal
*/
QItemSelectionModel::QItemSelectionModel(QItemSelectionModelPrivate &dd, QAbstractItemModel *model)
: QObject(dd, model)
{
dd.initModel(model);
}
/*!
Destroys the selection model.
*/
QItemSelectionModel::~QItemSelectionModel()
{
}
/*!
Selects the model item \a index using the specified \a command, and emits
selectionChanged().
\sa QItemSelectionModel::SelectionFlags
*/
void QItemSelectionModel::select(const QModelIndex &index, QItemSelectionModel::SelectionFlags command)
{
QItemSelection selection(index, index);
select(selection, command);
}
/*!
\fn void QItemSelectionModel::currentChanged(const QModelIndex ¤t, const QModelIndex &previous)
This signal is emitted whenever the current item changes. The \a previous
model item index is replaced by the \a current index as the selection's
current item.
Note that this signal will not be emitted when the item model is reset.
\sa currentIndex() setCurrentIndex() selectionChanged()
*/
/*!
\fn void QItemSelectionModel::currentColumnChanged(const QModelIndex ¤t, const QModelIndex &previous)
This signal is emitted if the \a current item changes and its column is
different to the column of the \a previous current item.
Note that this signal will not be emitted when the item model is reset.
\sa currentChanged() currentRowChanged() currentIndex() setCurrentIndex()
*/
/*!
\fn void QItemSelectionModel::currentRowChanged(const QModelIndex ¤t, const QModelIndex &previous)
This signal is emitted if the \a current item changes and its row is
different to the row of the \a previous current item.
Note that this signal will not be emitted when the item model is reset.
\sa currentChanged() currentColumnChanged() currentIndex() setCurrentIndex()
*/
/*!
\fn void QItemSelectionModel::selectionChanged(const QItemSelection &selected, const QItemSelection &deselected)
This signal is emitted whenever the selection changes. The change in the
selection is represented as an item selection of \a deselected items and
an item selection of \a selected items.
Note the that the current index changes independently from the selection.
Also note that this signal will not be emitted when the item model is reset.
\sa select() currentChanged()
*/
/*!
\enum QItemSelectionModel::SelectionFlag
This enum describes the way the selection model will be updated.
\value NoUpdate No selection will be made.
\value Clear The complete selection will be cleared.
\value Select All specified indexes will be selected.
\value Deselect All specified indexes will be deselected.
\value Toggle All specified indexes will be selected or
deselected depending on their current state.
\value Current The current selection will be updated.
\value Rows All indexes will be expanded to span rows.
\value Columns All indexes will be expanded to span columns.
\value SelectCurrent A combination of Select and Current, provided for
convenience.
\value ToggleCurrent A combination of Toggle and Current, provided for
convenience.
\value ClearAndSelect A combination of Clear and Select, provided for
convenience.
*/
/*!
Selects the item \a selection using the specified \a command, and emits
selectionChanged().
\sa QItemSelectionModel::SelectionFlag
*/
void QItemSelectionModel::select(const QItemSelection &selection, QItemSelectionModel::SelectionFlags command)
{
Q_D(QItemSelectionModel);
if (command == NoUpdate)
return;
// store old selection
QItemSelection sel = selection;
// If d->ranges is non-empty when the source model is reset the persistent indexes
// it contains will be invalid. We can't clear them in a modelReset slot because that might already
// be too late if another model observer is connected to the same modelReset slot and is invoked first
// it might call select() on this selection model before any such QItemSelectionModelPrivate::_q_modelReset() slot
// is invoked, so it would not be cleared yet. We clear it invalid ranges in it here.
QItemSelection::iterator it = d->ranges.begin();
while (it != d->ranges.end()) {
if (!it->isValid())
it = d->ranges.erase(it);
else
++it;
}
QItemSelection old = d->ranges;
old.merge(d->currentSelection, d->currentCommand);
// expand selection according to SelectionBehavior
if (command & Rows || command & Columns)
sel = d->expandSelection(sel, command);
// clear ranges and currentSelection
if (command & Clear) {
d->ranges.clear();
d->currentSelection.clear();
}
// merge and clear currentSelection if Current was not set (ie. start new currentSelection)
if (!(command & Current))
d->finalize();
// update currentSelection
if (command & Toggle || command & Select || command & Deselect) {
d->currentCommand = command;
d->currentSelection = sel;
}
// generate new selection, compare with old and emit selectionChanged()
QItemSelection newSelection = d->ranges;
newSelection.merge(d->currentSelection, d->currentCommand);
emitSelectionChanged(newSelection, old);
}
/*!
Clears the selection model. Emits selectionChanged() and currentChanged().
*/
void QItemSelectionModel::clear()
{
Q_D(QItemSelectionModel);
clearSelection();
QModelIndex previous = d->currentIndex;
d->currentIndex = QModelIndex();
if (previous.isValid()) {
emit currentChanged(d->currentIndex, previous);
emit currentRowChanged(d->currentIndex, previous);
emit currentColumnChanged(d->currentIndex, previous);
}
}
/*!
Clears the selection model. Does not emit any signals.
*/
void QItemSelectionModel::reset()
{
bool block = blockSignals(true);
clear();
blockSignals(block);
}
/*!
\since 4.2
Clears the selection in the selection model. Emits selectionChanged().
*/
void QItemSelectionModel::clearSelection()
{
Q_D(QItemSelectionModel);
if (d->ranges.count() == 0 && d->currentSelection.count() == 0)
return;
select(QItemSelection(), Clear);
}
/*!
Sets the model item \a index to be the current item, and emits
currentChanged(). The current item is used for keyboard navigation and
focus indication; it is independent of any selected items, although a
selected item can also be the current item.
Depending on the specified \a command, the \a index can also become part
of the current selection.
\sa select()
*/
void QItemSelectionModel::setCurrentIndex(const QModelIndex &index, QItemSelectionModel::SelectionFlags command)
{
Q_D(QItemSelectionModel);
if (index == d->currentIndex) {
if (command != NoUpdate)
select(index, command); // select item
return;
}
QPersistentModelIndex previous = d->currentIndex;
d->currentIndex = index; // set current before emitting selection changed below
if (command != NoUpdate)
select(d->currentIndex, command); // select item
emit currentChanged(d->currentIndex, previous);
if (d->currentIndex.row() != previous.row() ||
d->currentIndex.parent() != previous.parent())
emit currentRowChanged(d->currentIndex, previous);
if (d->currentIndex.column() != previous.column() ||
d->currentIndex.parent() != previous.parent())
emit currentColumnChanged(d->currentIndex, previous);
}
/*!
Returns the model item index for the current item, or an invalid index
if there is no current item.
*/
QModelIndex QItemSelectionModel::currentIndex() const
{
return static_cast<QModelIndex>(d_func()->currentIndex);
}
/*!
Returns true if the given model item \a index is selected.
*/
bool QItemSelectionModel::isSelected(const QModelIndex &index) const
{
Q_D(const QItemSelectionModel);
if (d->model != index.model() || !index.isValid())
return false;
bool selected = false;
// search model ranges
QList<QItemSelectionRange>::const_iterator it = d->ranges.begin();
for (; it != d->ranges.end(); ++it) {
if ((*it).isValid() && (*it).contains(index)) {
selected = true;
break;
}
}
// check currentSelection
if (d->currentSelection.count()) {
if ((d->currentCommand & Deselect) && selected)
selected = !d->currentSelection.contains(index);
else if (d->currentCommand & Toggle)
selected ^= d->currentSelection.contains(index);
else if ((d->currentCommand & Select) && !selected)
selected = d->currentSelection.contains(index);
}
if (selected) {
Qt::ItemFlags flags = d->model->flags(index);
return (flags & Qt::ItemIsSelectable);
}
return false;
}
/*!
Returns true if all items are selected in the \a row with the given
\a parent.
Note that this function is usually faster than calling isSelected()
on all items in the same row and that unselectable items are
ignored.
*/
bool QItemSelectionModel::isRowSelected(int row, const QModelIndex &parent) const
{
Q_D(const QItemSelectionModel);
if (parent.isValid() && d->model != parent.model())
return false;
// return false if row exist in currentSelection (Deselect)
if (d->currentCommand & Deselect && d->currentSelection.count()) {
for (int i=0; i<d->currentSelection.count(); ++i) {
if (d->currentSelection.at(i).parent() == parent &&
row >= d->currentSelection.at(i).top() &&
row <= d->currentSelection.at(i).bottom())
return false;
}
}
// return false if ranges in both currentSelection and ranges
// intersect and have the same row contained
if (d->currentCommand & Toggle && d->currentSelection.count()) {
for (int i=0; i<d->currentSelection.count(); ++i)
if (d->currentSelection.at(i).top() <= row &&
d->currentSelection.at(i).bottom() >= row)
for (int j=0; j<d->ranges.count(); ++j)
if (d->ranges.at(j).top() <= row && d->ranges.at(j).bottom() >= row
&& d->currentSelection.at(i).intersected(d->ranges.at(j)).isValid())
return false;
}
// add ranges and currentSelection and check through them all
QList<QItemSelectionRange>::const_iterator it;
QList<QItemSelectionRange> joined = d->ranges;
if (d->currentSelection.count())
joined += d->currentSelection;
int colCount = d->model->columnCount(parent);
for (int column = 0; column < colCount; ++column) {
for (it = joined.constBegin(); it != joined.constEnd(); ++it) {
if ((*it).contains(row, column, parent)) {
bool selectable = false;
for (int i = column; !selectable && i <= (*it).right(); ++i) {
Qt::ItemFlags flags = d->model->index(row, i, parent).flags();
selectable = flags & Qt::ItemIsSelectable;
}
if (selectable){
column = qMax(column, (*it).right());
break;
}
}
}
if (it == joined.constEnd())
return false;
}
return colCount > 0; // no columns means no selected items
}
/*!
Returns true if all items are selected in the \a column with the given
\a parent.
Note that this function is usually faster than calling isSelected()
on all items in the same column and that unselectable items are
ignored.
*/
bool QItemSelectionModel::isColumnSelected(int column, const QModelIndex &parent) const
{
Q_D(const QItemSelectionModel);
if (parent.isValid() && d->model != parent.model())
return false;
// return false if column exist in currentSelection (Deselect)
if (d->currentCommand & Deselect && d->currentSelection.count()) {
for (int i = 0; i < d->currentSelection.count(); ++i) {
if (d->currentSelection.at(i).parent() == parent &&
column >= d->currentSelection.at(i).left() &&
column <= d->currentSelection.at(i).right())
return false;
}
}
// return false if ranges in both currentSelection and the selection model
// intersect and have the same column contained
if (d->currentCommand & Toggle && d->currentSelection.count()) {
for (int i = 0; i < d->currentSelection.count(); ++i) {
if (d->currentSelection.at(i).left() <= column &&
d->currentSelection.at(i).right() >= column) {
for (int j = 0; j < d->ranges.count(); ++j) {
if (d->ranges.at(j).left() <= column && d->ranges.at(j).right() >= column
&& d->currentSelection.at(i).intersected(d->ranges.at(j)).isValid()) {
return false;
}
}
}
}
}
// add ranges and currentSelection and check through them all
QList<QItemSelectionRange>::const_iterator it;
QList<QItemSelectionRange> joined = d->ranges;
if (d->currentSelection.count())
joined += d->currentSelection;
int rowCount = d->model->rowCount(parent);
for (int row = 0; row < rowCount; ++row) {
for (it = joined.constBegin(); it != joined.constEnd(); ++it) {
if ((*it).contains(row, column, parent)) {
Qt::ItemFlags flags = d->model->index(row, column, parent).flags();
if ((flags & Qt::ItemIsSelectable) && (flags & Qt::ItemIsEnabled)) {
row = qMax(row, (*it).bottom());
break;
}
}
}
if (it == joined.constEnd())
return false;
}
return rowCount > 0; // no rows means no selected items
}
/*!
Returns true if there are any items selected in the \a row with the given
\a parent.
*/
bool QItemSelectionModel::rowIntersectsSelection(int row, const QModelIndex &parent) const
{
Q_D(const QItemSelectionModel);
if (parent.isValid() && d->model != parent.model())
return false;
QItemSelection sel = d->ranges;
sel.merge(d->currentSelection, d->currentCommand);
for (int i = 0; i < sel.count(); ++i) {
int top = sel.at(i).top();
int bottom = sel.at(i).bottom();
int left = sel.at(i).left();
int right = sel.at(i).right();
if (top <= row && bottom >= row) {
for (int j = left; j <= right; j++) {
const Qt::ItemFlags flags = d->model->index(row, j, parent).flags();
if ((flags & Qt::ItemIsSelectable) && (flags & Qt::ItemIsEnabled))
return true;
}
}
}
return false;
}
/*!
Returns true if there are any items selected in the \a column with the given
\a parent.
*/
bool QItemSelectionModel::columnIntersectsSelection(int column, const QModelIndex &parent) const
{
Q_D(const QItemSelectionModel);
if (parent.isValid() && d->model != parent.model())
return false;
QItemSelection sel = d->ranges;
sel.merge(d->currentSelection, d->currentCommand);
for (int i = 0; i < sel.count(); ++i) {
int left = sel.at(i).left();
int right = sel.at(i).right();
int top = sel.at(i).top();
int bottom = sel.at(i).bottom();
if (left <= column && right >= column) {
for (int j = top; j <= bottom; j++) {
const Qt::ItemFlags flags = d->model->index(j, column, parent).flags();
if ((flags & Qt::ItemIsSelectable) && (flags & Qt::ItemIsEnabled))
return true;
}
}
}
return false;
}
/*!
\since 4.2
Returns true if the selection model contains any selection ranges;
otherwise returns false.
*/
bool QItemSelectionModel::hasSelection() const
{
Q_D(const QItemSelectionModel);
if (d->currentCommand & (Toggle | Deselect)) {
QItemSelection sel = d->ranges;
sel.merge(d->currentSelection, d->currentCommand);
return !sel.isEmpty();
} else {
return !(d->ranges.isEmpty() && d->currentSelection.isEmpty());
}
}
/*!
Returns a list of all selected model item indexes. The list contains no
duplicates, and is not sorted.
*/
QModelIndexList QItemSelectionModel::selectedIndexes() const
{
Q_D(const QItemSelectionModel);
QItemSelection selected = d->ranges;
selected.merge(d->currentSelection, d->currentCommand);
return selected.indexes();
}
/*!
\since 4.2
Returns the indexes in the given \a column for the rows where all columns are selected.
\sa selectedIndexes(), selectedColumns()
*/
QModelIndexList QItemSelectionModel::selectedRows(int column) const
{
QModelIndexList indexes;
//the QSet contains pairs of parent modelIndex
//and row number
QSet< QPair<QModelIndex, int> > rowsSeen;
const QItemSelection ranges = selection();
for (int i = 0; i < ranges.count(); ++i) {
const QItemSelectionRange &range = ranges.at(i);
QModelIndex parent = range.parent();
for (int row = range.top(); row <= range.bottom(); row++) {
QPair<QModelIndex, int> rowDef = qMakePair(parent, row);
if (!rowsSeen.contains(rowDef)) {
rowsSeen << rowDef;
if (isRowSelected(row, parent)) {
indexes.append(model()->index(row, column, parent));
}
}
}
}
return indexes;
}
/*!
\since 4.2
Returns the indexes in the given \a row for columns where all rows are selected.
\sa selectedIndexes(), selectedRows()
*/
QModelIndexList QItemSelectionModel::selectedColumns(int row) const
{
QModelIndexList indexes;
//the QSet contains pairs of parent modelIndex
//and column number
QSet< QPair<QModelIndex, int> > columnsSeen;
const QItemSelection ranges = selection();
for (int i = 0; i < ranges.count(); ++i) {
const QItemSelectionRange &range = ranges.at(i);
QModelIndex parent = range.parent();
for (int column = range.left(); column <= range.right(); column++) {
QPair<QModelIndex, int> columnDef = qMakePair(parent, column);
if (!columnsSeen.contains(columnDef)) {
columnsSeen << columnDef;
if (isColumnSelected(column, parent)) {
indexes.append(model()->index(row, column, parent));
}
}
}
}
return indexes;
}
/*!
Returns the selection ranges stored in the selection model.
*/
const QItemSelection QItemSelectionModel::selection() const
{
Q_D(const QItemSelectionModel);
QItemSelection selected = d->ranges;
selected.merge(d->currentSelection, d->currentCommand);
int i = 0;
// make sure we have no invalid ranges
// ### should probably be handled more generic somewhere else
while (i<selected.count()) {
if (selected.at(i).isValid())
++i;
else
(selected.removeAt(i));
}
return selected;
}
/*!
Returns the item model operated on by the selection model.
*/
const QAbstractItemModel *QItemSelectionModel::model() const
{
return d_func()->model;
}
/*!
Compares the two selections \a newSelection and \a oldSelection
and emits selectionChanged() with the deselected and selected items.
*/
void QItemSelectionModel::emitSelectionChanged(const QItemSelection &newSelection,
const QItemSelection &oldSelection)
{
// if both selections are empty or equal we return
if ((oldSelection.isEmpty() && newSelection.isEmpty()) ||
oldSelection == newSelection)
return;
// if either selection is empty we do not need to compare
if (oldSelection.isEmpty() || newSelection.isEmpty()) {
emit selectionChanged(newSelection, oldSelection);
return;
}
QItemSelection deselected = oldSelection;
QItemSelection selected = newSelection;
// remove equal ranges
bool advance;
for (int o = 0; o < deselected.count(); ++o) {
advance = true;
for (int s = 0; s < selected.count() && o < deselected.count();) {
if (deselected.at(o) == selected.at(s)) {
deselected.removeAt(o);
selected.removeAt(s);
advance = false;
} else {
++s;
}
}
if (advance)
++o;
}
// find intersections
QItemSelection intersections;
for (int o = 0; o < deselected.count(); ++o) {
for (int s = 0; s < selected.count(); ++s) {
if (deselected.at(o).intersects(selected.at(s)))
intersections.append(deselected.at(o).intersected(selected.at(s)));
}
}
// compare remaining ranges with intersections and split them to find deselected and selected
for (int i = 0; i < intersections.count(); ++i) {
// split deselected
for (int o = 0; o < deselected.count();) {
if (deselected.at(o).intersects(intersections.at(i))) {
QItemSelection::split(deselected.at(o), intersections.at(i), &deselected);
deselected.removeAt(o);
} else {
++o;
}
}
// split selected
for (int s = 0; s < selected.count();) {
if (selected.at(s).intersects(intersections.at(i))) {
QItemSelection::split(selected.at(s), intersections.at(i), &selected);
selected.removeAt(s);
} else {
++s;
}
}
}
if (!selected.isEmpty() || !deselected.isEmpty())
emit selectionChanged(selected, deselected);
}
#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug dbg, const QItemSelectionRange &range)
{
#ifndef Q_BROKEN_DEBUG_STREAM
dbg.nospace() << "QItemSelectionRange(" << range.topLeft()
<< ',' << range.bottomRight() << ')';
return dbg.space();
#else
qWarning("This compiler doesn't support streaming QItemSelectionRange to QDebug");
return dbg;
Q_UNUSED(range);
#endif
}
#endif
QT_END_NAMESPACE
#include "moc_qitemselectionmodel.cpp"
#endif // QT_NO_ITEMVIEWS
|