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klinkitemselectionmodel.cpp
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1/*
2 Copyright (C) 2010 Klarälvdalens Datakonsult AB,
3 a KDAB Group company, info@kdab.net,
4 author Stephen Kelly <stephen@kdab.com>
5
6 This library is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Library General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or (at your
9 option) any later version.
10
11 This library is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
14 License for more details.
15
16 You should have received a copy of the GNU Library General Public License
17 along with this library; see the file COPYING.LIB. If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 02110-1301, USA.
20*/
21
22
23#include "klinkitemselectionmodel.h"
24
25#include "kmodelindexproxymapper.h"
26
27#include "kdebug.h"
28
29#include <QItemSelection>
30
31class KLinkItemSelectionModelPrivate
32{
33public:
34 KLinkItemSelectionModelPrivate(KLinkItemSelectionModel *proxySelectionModel, QAbstractItemModel *model,
35 QItemSelectionModel *linkedItemSelectionModel)
36 : q_ptr(proxySelectionModel),
37 m_model(model),
38 m_linkedItemSelectionModel(linkedItemSelectionModel),
39 m_ignoreCurrentChanged(false),
40 m_indexMapper(new KModelIndexProxyMapper(model, linkedItemSelectionModel->model(), proxySelectionModel))
41 {
42 }
43
44 Q_DECLARE_PUBLIC(KLinkItemSelectionModel)
45 KLinkItemSelectionModel * const q_ptr;
46
47
48 bool assertSelectionValid(const QItemSelection &selection) const {
49 foreach(const QItemSelectionRange &range, selection) {
50 if (!range.isValid()) {
51 kDebug() << selection;
52 }
53 Q_ASSERT(range.isValid());
54 }
55 return true;
56 }
57
58 void sourceSelectionChanged(const QItemSelection& selected, const QItemSelection& deselected);
59 void sourceCurrentChanged(const QModelIndex& current);
60 void slotCurrentChanged(const QModelIndex& current);
61
62 QAbstractItemModel * const m_model;
63 QItemSelectionModel * const m_linkedItemSelectionModel;
64 bool m_ignoreCurrentChanged;
65 KModelIndexProxyMapper * const m_indexMapper;
66};
67
68KLinkItemSelectionModel::KLinkItemSelectionModel(QAbstractItemModel *model, QItemSelectionModel *proxySelector, QObject *parent)
69 : QItemSelectionModel(model, parent),
70 d_ptr(new KLinkItemSelectionModelPrivate(this, model, proxySelector))
71{
72 connect(proxySelector, SIGNAL(selectionChanged(QItemSelection,QItemSelection)), SLOT(sourceSelectionChanged(QItemSelection,QItemSelection)));
73 connect(proxySelector, SIGNAL(currentChanged(QModelIndex,QModelIndex)), SLOT(sourceCurrentChanged(QModelIndex)));
74 connect(this, SIGNAL(currentChanged(QModelIndex,QModelIndex)), SLOT(slotCurrentChanged(QModelIndex)));
75}
76
77KLinkItemSelectionModel::~KLinkItemSelectionModel()
78{
79 delete d_ptr;
80}
81
82void KLinkItemSelectionModel::select(const QModelIndex &index, QItemSelectionModel::SelectionFlags command)
83{
84 Q_D(KLinkItemSelectionModel);
85 // When an item is removed, the current index is set to the top index in the model.
86 // That causes a selectionChanged signal with a selection which we do not want.
87 if (d->m_ignoreCurrentChanged) {
88 return;
89 }
90 // Do *not* replace next line with: QItemSelectionModel::select(index, command)
91 //
92 // Doing so would end up calling KLinkItemSelectionModel::select(QItemSelection, QItemSelectionModel::SelectionFlags)
93 //
94 // This is because the code for QItemSelectionModel::select(QModelIndex, QItemSelectionModel::SelectionFlags) looks like this:
95 // {
96 // QItemSelection selection(index, index);
97 // select(selection, command);
98 // }
99 // So it calls KLinkItemSelectionModel overload of
100 // select(QItemSelection, QItemSelectionModel::SelectionFlags)
101 //
102 // When this happens and the selection flags include Toggle, it causes the
103 // selection to be toggled twice.
104 QItemSelectionModel::select(QItemSelection(index, index), command);
105 if (index.isValid())
106 d->m_linkedItemSelectionModel->select(d->m_indexMapper->mapSelectionLeftToRight(QItemSelection(index, index)), command);
107 else {
108 d->m_linkedItemSelectionModel->clearSelection();
109 }
110}
111
112// QAbstractProxyModel::mapSelectionFromSource creates invalid ranges to we filter
113// those out manually in a loop. Hopefully fixed in Qt 4.7.2, so we ifdef it out.
114// http://qt.gitorious.org/qt/qt/merge_requests/2474
115// http://qt.gitorious.org/qt/qt/merge_requests/831
116#if QT_VERSION < 0x040702
117#define RANGE_FIX_HACK
118#endif
119
120#ifdef RANGE_FIX_HACK
121static QItemSelection klink_removeInvalidRanges(const QItemSelection &selection)
122{
123 QItemSelection result;
124 Q_FOREACH(const QItemSelectionRange &range, selection)
125 {
126 if (!range.isValid())
127 continue;
128 result << range;
129 }
130 return result;
131}
132#endif
133
134void KLinkItemSelectionModel::select(const QItemSelection &selection, QItemSelectionModel::SelectionFlags command)
135{
136 Q_D(KLinkItemSelectionModel);
137 d->m_ignoreCurrentChanged = true;
138#ifdef RANGE_FIX_HACK
139 QItemSelection _selection = klink_removeInvalidRanges(selection);
140#else
141 QItemSelection _selection = selection;
142#endif
143 QItemSelectionModel::select(_selection, command);
144 Q_ASSERT(d->assertSelectionValid(_selection));
145 QItemSelection mappedSelection = d->m_indexMapper->mapSelectionLeftToRight(_selection);
146 Q_ASSERT(d->assertSelectionValid(mappedSelection));
147 d->m_linkedItemSelectionModel->select(mappedSelection, command);
148 d->m_ignoreCurrentChanged = false;
149}
150
151void KLinkItemSelectionModelPrivate::slotCurrentChanged(const QModelIndex& current)
152{
153 const QModelIndex mappedCurrent = m_indexMapper->mapLeftToRight(current);
154 if (!mappedCurrent.isValid()) {
155 return;
156 }
157 m_linkedItemSelectionModel->setCurrentIndex(mappedCurrent, QItemSelectionModel::NoUpdate);
158}
159
160void KLinkItemSelectionModelPrivate::sourceSelectionChanged(const QItemSelection& selected, const QItemSelection& deselected)
161{
162 Q_Q(KLinkItemSelectionModel);
163#ifdef RANGE_FIX_HACK
164 QItemSelection _selected = klink_removeInvalidRanges(selected);
165 QItemSelection _deselected = klink_removeInvalidRanges(deselected);
166#else
167 QItemSelection _selected = selected;
168 QItemSelection _deselected = deselected;
169#endif
170 Q_ASSERT(assertSelectionValid(_selected));
171 Q_ASSERT(assertSelectionValid(_deselected));
172 const QItemSelection mappedDeselection = m_indexMapper->mapSelectionRightToLeft(_deselected);
173 const QItemSelection mappedSelection = m_indexMapper->mapSelectionRightToLeft(_selected);
174
175 q->QItemSelectionModel::select(mappedDeselection, QItemSelectionModel::Deselect);
176 q->QItemSelectionModel::select(mappedSelection, QItemSelectionModel::Select);
177}
178
179void KLinkItemSelectionModelPrivate::sourceCurrentChanged(const QModelIndex& current)
180{
181 Q_Q(KLinkItemSelectionModel);
182 const QModelIndex mappedCurrent = m_indexMapper->mapRightToLeft(current);
183 if (!mappedCurrent.isValid()) {
184 return;
185 }
186 q->setCurrentIndex(mappedCurrent, QItemSelectionModel::NoUpdate);
187}
188
189#include "klinkitemselectionmodel.moc"
KLinkItemSelectionModel
Makes it possible to share a selection in multiple views which do not have the same source model.
Definition: klinkitemselectionmodel.h:96
KLinkItemSelectionModel::d_ptr
KLinkItemSelectionModelPrivate *const d_ptr
Definition: klinkitemselectionmodel.h:108
KLinkItemSelectionModel::select
void select(const QModelIndex &index, QItemSelectionModel::SelectionFlags command)
Definition: klinkitemselectionmodel.cpp:82
KLinkItemSelectionModel::KLinkItemSelectionModel
KLinkItemSelectionModel(QAbstractItemModel *targetModel, QItemSelectionModel *linkedItemSelectionModel, QObject *parent=0)
Constructor.
Definition: klinkitemselectionmodel.cpp:68
KLinkItemSelectionModel::~KLinkItemSelectionModel
~KLinkItemSelectionModel()
Definition: klinkitemselectionmodel.cpp:77
KModelIndexProxyMapper
This class facilitates easy mapping of indexes and selections through proxy models.
Definition: kmodelindexproxymapper.h:80
QAbstractItemModel
QItemSelectionModel
QObject
kDebug
#define kDebug
kdebug.h
klink_removeInvalidRanges
static QItemSelection klink_removeInvalidRanges(const QItemSelection &selection)
Definition: klinkitemselectionmodel.cpp:121
klinkitemselectionmodel.h
kmodelindexproxymapper.h
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