/***************************************************************************
- * Copyright (C) 2005-08 by the Quassel Project *
+ * Copyright (C) 2005-2018 by the Quassel Project *
* devel@quassel-irc.org *
* *
* This program is free software; you can redistribute it and/or modify *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
- * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#include "selectionmodelsynchronizer.h"
-
#include <QAbstractItemModel>
-#include "mappedselectionmodel.h"
#include <QAbstractProxyModel>
#include <QDebug>
SelectionModelSynchronizer::SelectionModelSynchronizer(QAbstractItemModel *parent)
- : QObject(parent),
+ : QObject(parent),
_model(parent),
- _selectionModel(parent)
+ _selectionModel(parent),
+ _changeCurrentEnabled(true),
+ _changeSelectionEnabled(true)
{
- connect(&_selectionModel, SIGNAL(currentChanged(const QModelIndex &, const QModelIndex &)),
- this, SLOT(currentChanged(const QModelIndex &, const QModelIndex &)));
- connect(&_selectionModel, SIGNAL(selectionChanged(const QItemSelection &, const QItemSelection &)),
- this, SLOT(selectionChanged(const QItemSelection &, const QItemSelection &)));
+ connect(&_selectionModel, SIGNAL(currentChanged(const QModelIndex &, const QModelIndex &)),
+ this, SLOT(currentChanged(const QModelIndex &, const QModelIndex &)));
+ connect(&_selectionModel, SIGNAL(selectionChanged(const QItemSelection &, const QItemSelection &)),
+ this, SLOT(selectionChanged(const QItemSelection &, const QItemSelection &)));
}
-bool SelectionModelSynchronizer::checkBaseModel(QItemSelectionModel *selectionModel) {
- if(!selectionModel)
- return false;
-
- const QAbstractItemModel *baseModel = selectionModel->model();
- const QAbstractProxyModel *proxyModel = 0;
- while((proxyModel = qobject_cast<const QAbstractProxyModel *>(baseModel)) != 0) {
- baseModel = proxyModel->sourceModel();
- if(baseModel == model())
- break;
- }
- return baseModel == model();
+
+bool SelectionModelSynchronizer::checkBaseModel(QItemSelectionModel *selectionModel)
+{
+ if (!selectionModel)
+ return false;
+
+ const QAbstractItemModel *baseModel = selectionModel->model();
+ const QAbstractProxyModel *proxyModel = 0;
+ while ((proxyModel = qobject_cast<const QAbstractProxyModel *>(baseModel)) != 0) {
+ baseModel = proxyModel->sourceModel();
+ if (baseModel == model())
+ break;
+ }
+ return baseModel == model();
}
-void SelectionModelSynchronizer::addSelectionModel(QItemSelectionModel *selectionModel) {
- if(!checkBaseModel(selectionModel)) {
- qWarning() << "cannot Syncronize SelectionModel" << selectionModel << "which has a different baseModel()";
- return;
- }
-
- connect(selectionModel, SIGNAL(currentChanged(QModelIndex, QModelIndex)),
- this, SLOT(mappedCurrentChanged(QModelIndex, QModelIndex)));
- connect(selectionModel, SIGNAL(selectionChanged(QItemSelection, QItemSelection)),
- this, SLOT(mappedSelectionChanged(QItemSelection, QItemSelection)));
-
- if(qobject_cast<MappedSelectionModel *>(selectionModel)) {
- connect(this, SIGNAL(setCurrentIndex(QModelIndex, QItemSelectionModel::SelectionFlags)),
- selectionModel, SLOT(mappedSetCurrentIndex(QModelIndex, QItemSelectionModel::SelectionFlags)));
- connect(this, SIGNAL(select(QItemSelection, QItemSelectionModel::SelectionFlags)),
- selectionModel, SLOT(mappedSelect(QItemSelection, QItemSelectionModel::SelectionFlags)));
- } else {
- connect(this, SIGNAL(setCurrentIndex(QModelIndex, QItemSelectionModel::SelectionFlags)),
- selectionModel, SLOT(setCurrentIndex(QModelIndex, QItemSelectionModel::SelectionFlags)));
- connect(this, SIGNAL(select(QItemSelection, QItemSelectionModel::SelectionFlags)),
- selectionModel, SLOT(select(QItemSelection, QItemSelectionModel::SelectionFlags)));
- }
+
+void SelectionModelSynchronizer::synchronizeSelectionModel(QItemSelectionModel *selectionModel)
+{
+ if (!checkBaseModel(selectionModel)) {
+ qWarning() << "cannot Synchronize SelectionModel" << selectionModel << "which has a different baseModel()";
+ return;
+ }
+
+ if (_selectionModels.contains(selectionModel)) {
+ selectionModel->setCurrentIndex(mapFromSource(currentIndex(), selectionModel), QItemSelectionModel::Current);
+ selectionModel->select(mapSelectionFromSource(currentSelection(), selectionModel), QItemSelectionModel::ClearAndSelect);
+ return;
+ }
+
+ connect(selectionModel, SIGNAL(currentChanged(QModelIndex, QModelIndex)),
+ this, SLOT(syncedCurrentChanged(QModelIndex, QModelIndex)));
+ connect(selectionModel, SIGNAL(selectionChanged(QItemSelection, QItemSelection)),
+ this, SLOT(syncedSelectionChanged(QItemSelection, QItemSelection)));
+
+ connect(selectionModel, SIGNAL(destroyed(QObject *)), this, SLOT(selectionModelDestroyed(QObject *)));
+
+ _selectionModels << selectionModel;
}
-void SelectionModelSynchronizer::removeSelectionModel(QItemSelectionModel *model) {
- disconnect(model, 0, this, 0);
- disconnect(this, 0, model, 0);
+
+void SelectionModelSynchronizer::removeSelectionModel(QItemSelectionModel *model)
+{
+ disconnect(model, 0, this, 0);
+ disconnect(this, 0, model, 0);
+ selectionModelDestroyed(model);
}
-void SelectionModelSynchronizer::mappedCurrentChanged(const QModelIndex ¤t, const QModelIndex &previous) {
- Q_UNUSED(previous);
- QItemSelectionModel *selectionModel = qobject_cast<QItemSelectionModel *>(sender());
- Q_ASSERT(selectionModel);
- QModelIndex newSourceCurrent = mapToSource(current, selectionModel);
- if(newSourceCurrent.isValid() && newSourceCurrent != currentIndex())
- setCurrentIndex(newSourceCurrent);
+
+void SelectionModelSynchronizer::selectionModelDestroyed(QObject *object)
+{
+ QItemSelectionModel *model = static_cast<QItemSelectionModel *>(object);
+ QSet<QItemSelectionModel *>::iterator iter = _selectionModels.begin();
+ while (iter != _selectionModels.end()) {
+ if (*iter == model) {
+ iter = _selectionModels.erase(iter);
+ }
+ else {
+ ++iter;
+ }
+ }
}
-void SelectionModelSynchronizer::mappedSelectionChanged(const QItemSelection &selected, const QItemSelection &deselected) {
- Q_UNUSED(selected);
- Q_UNUSED(deselected);
- QItemSelectionModel *selectionModel = qobject_cast<QItemSelectionModel *>(sender());
- Q_ASSERT(selectionModel);
- QItemSelection newSourceSelection = mapSelectionToSource(selectionModel->selection(), selectionModel);
- QItemSelection currentContainsSelection = newSourceSelection;
- currentContainsSelection.merge(currentSelection(), QItemSelectionModel::Deselect);
- if(!currentContainsSelection.isEmpty())
- setCurrentSelection(newSourceSelection);
+
+void SelectionModelSynchronizer::syncedCurrentChanged(const QModelIndex ¤t, const QModelIndex &previous)
+{
+ Q_UNUSED(previous);
+
+ if (!_changeCurrentEnabled)
+ return;
+
+ QItemSelectionModel *selectionModel = qobject_cast<QItemSelectionModel *>(sender());
+ Q_ASSERT(selectionModel);
+ QModelIndex newSourceCurrent = mapToSource(current, selectionModel);
+ if (newSourceCurrent.isValid() && newSourceCurrent != currentIndex())
+ setCurrentIndex(newSourceCurrent);
}
-QModelIndex SelectionModelSynchronizer::mapToSource(const QModelIndex &index, QItemSelectionModel *selectionModel) {
- Q_ASSERT(selectionModel);
-
- QModelIndex sourceIndex = index;
- const QAbstractItemModel *baseModel = selectionModel->model();
- const QAbstractProxyModel *proxyModel = 0;
- while((proxyModel = qobject_cast<const QAbstractProxyModel *>(baseModel)) != 0) {
- sourceIndex = proxyModel->mapToSource(sourceIndex);
- baseModel = proxyModel->sourceModel();
- if(baseModel == model())
- break;
- }
- return sourceIndex;
+
+void SelectionModelSynchronizer::syncedSelectionChanged(const QItemSelection &selected, const QItemSelection &deselected)
+{
+ Q_UNUSED(selected);
+ Q_UNUSED(deselected);
+
+ if (!_changeSelectionEnabled)
+ return;
+
+ QItemSelectionModel *selectionModel = qobject_cast<QItemSelectionModel *>(sender());
+ Q_ASSERT(selectionModel);
+
+ QItemSelection mappedSelection = selectionModel->selection();
+ QItemSelection currentSelectionMapped = mapSelectionFromSource(currentSelection(), selectionModel);
+
+ QItemSelection checkSelection = currentSelectionMapped;
+ checkSelection.merge(mappedSelection, QItemSelectionModel::Deselect);
+ if (checkSelection.isEmpty()) {
+ // that means the new selection contains the current selection (currentSel - newSel = {})
+ checkSelection = mappedSelection;
+ checkSelection.merge(currentSelectionMapped, QItemSelectionModel::Deselect);
+ if (checkSelection.isEmpty()) {
+ // that means the current selection contains the new selection (newSel - currentSel = {})
+ // -> currentSel == newSel
+ return;
+ }
+ }
+ setCurrentSelection(mapSelectionToSource(mappedSelection, selectionModel));
}
-QItemSelection SelectionModelSynchronizer::mapSelectionToSource(const QItemSelection &selection, QItemSelectionModel *selectionModel) {
- Q_ASSERT(selectionModel);
-
- QItemSelection sourceSelection = selection;
- const QAbstractItemModel *baseModel = selectionModel->model();
- const QAbstractProxyModel *proxyModel = 0;
- while((proxyModel = qobject_cast<const QAbstractProxyModel *>(baseModel)) != 0) {
- sourceSelection = proxyModel->mapSelectionToSource(sourceSelection);
- baseModel = proxyModel->sourceModel();
- if(baseModel == model())
- break;
- }
- return sourceSelection;
+
+QModelIndex SelectionModelSynchronizer::mapFromSource(const QModelIndex &sourceIndex, const QItemSelectionModel *selectionModel)
+{
+ Q_ASSERT(selectionModel);
+
+ QModelIndex mappedIndex = sourceIndex;
+
+ // make a list of all involved proxies, wie have to traverse backwards
+ QList<const QAbstractProxyModel *> proxyModels;
+ const QAbstractItemModel *baseModel = selectionModel->model();
+ const QAbstractProxyModel *proxyModel = 0;
+ while ((proxyModel = qobject_cast<const QAbstractProxyModel *>(baseModel)) != 0) {
+ if (baseModel == model())
+ break;
+ proxyModels << proxyModel;
+ baseModel = proxyModel->sourceModel();
+ }
+
+ // now traverse it;
+ for (int i = proxyModels.count() - 1; i >= 0; i--) {
+ mappedIndex = proxyModels[i]->mapFromSource(mappedIndex);
+ }
+
+ return mappedIndex;
}
-void SelectionModelSynchronizer::setCurrentIndex(const QModelIndex &index) {
- _selectionModel.setCurrentIndex(index, QItemSelectionModel::Current);
+
+QItemSelection SelectionModelSynchronizer::mapSelectionFromSource(const QItemSelection &sourceSelection, const QItemSelectionModel *selectionModel)
+{
+ Q_ASSERT(selectionModel);
+
+ QItemSelection mappedSelection = sourceSelection;
+
+ // make a list of all involved proxies, wie have to traverse backwards
+ QList<const QAbstractProxyModel *> proxyModels;
+ const QAbstractItemModel *baseModel = selectionModel->model();
+ const QAbstractProxyModel *proxyModel = 0;
+ while ((proxyModel = qobject_cast<const QAbstractProxyModel *>(baseModel)) != 0) {
+ if (baseModel == model())
+ break;
+ proxyModels << proxyModel;
+ baseModel = proxyModel->sourceModel();
+ }
+
+ // now traverse it;
+ for (int i = proxyModels.count() - 1; i >= 0; i--) {
+ mappedSelection = proxyModels[i]->mapSelectionFromSource(mappedSelection);
+ }
+ return mappedSelection;
}
-void SelectionModelSynchronizer::setCurrentSelection(const QItemSelection &selection) {
- _selectionModel.select(selection, QItemSelectionModel::Rows | QItemSelectionModel::ClearAndSelect);
+
+
+QModelIndex SelectionModelSynchronizer::mapToSource(const QModelIndex &index, QItemSelectionModel *selectionModel)
+{
+ Q_ASSERT(selectionModel);
+
+ QModelIndex sourceIndex = index;
+ const QAbstractItemModel *baseModel = selectionModel->model();
+ const QAbstractProxyModel *proxyModel = 0;
+ while ((proxyModel = qobject_cast<const QAbstractProxyModel *>(baseModel)) != 0) {
+ sourceIndex = proxyModel->mapToSource(sourceIndex);
+ baseModel = proxyModel->sourceModel();
+ if (baseModel == model())
+ break;
+ }
+ return sourceIndex;
}
-void SelectionModelSynchronizer::currentChanged(const QModelIndex ¤t, const QModelIndex &previous) {
- Q_UNUSED(previous);
- emit setCurrentIndex(current, QItemSelectionModel::Current);
+
+QItemSelection SelectionModelSynchronizer::mapSelectionToSource(const QItemSelection &selection, QItemSelectionModel *selectionModel)
+{
+ Q_ASSERT(selectionModel);
+
+ QItemSelection sourceSelection = selection;
+ const QAbstractItemModel *baseModel = selectionModel->model();
+ const QAbstractProxyModel *proxyModel = 0;
+ while ((proxyModel = qobject_cast<const QAbstractProxyModel *>(baseModel)) != 0) {
+ sourceSelection = proxyModel->mapSelectionToSource(sourceSelection);
+ baseModel = proxyModel->sourceModel();
+ if (baseModel == model())
+ break;
+ }
+ return sourceSelection;
}
-void SelectionModelSynchronizer::selectionChanged(const QItemSelection &selected, const QItemSelection &deselected) {
- Q_UNUSED(selected);
- Q_UNUSED(deselected);
- emit select(_selectionModel.selection(), QItemSelectionModel::ClearAndSelect);
+
+void SelectionModelSynchronizer::setCurrentIndex(const QModelIndex &index)
+{
+ _selectionModel.setCurrentIndex(index, QItemSelectionModel::Current);
+}
+
+
+void SelectionModelSynchronizer::setCurrentSelection(const QItemSelection &selection)
+{
+ _selectionModel.select(selection, QItemSelectionModel::ClearAndSelect);
+}
+
+
+void SelectionModelSynchronizer::currentChanged(const QModelIndex ¤t, const QModelIndex &previous)
+{
+ Q_UNUSED(previous);
+
+ _changeCurrentEnabled = false;
+ QSet<QItemSelectionModel *>::iterator iter = _selectionModels.begin();
+ while (iter != _selectionModels.end()) {
+ (*iter)->setCurrentIndex(mapFromSource(current, (*iter)), QItemSelectionModel::Current);
+ ++iter;
+ }
+ _changeCurrentEnabled = true;
+
+ // Trigger a dataChanged() signal from the base model to update all proxy models (e.g. filters).
+ // Since signals are protected, we have to use invokeMethod for faking signal emission.
+ if (previous.isValid()) {
+ QMetaObject::invokeMethod(model(), "dataChanged", Qt::DirectConnection,
+ Q_ARG(QModelIndex, previous), Q_ARG(QModelIndex, previous));
+ }
+}
+
+
+void SelectionModelSynchronizer::selectionChanged(const QItemSelection &selected, const QItemSelection &deselected)
+{
+ Q_UNUSED(selected);
+ Q_UNUSED(deselected);
+
+ _changeSelectionEnabled = false;
+ QSet<QItemSelectionModel *>::iterator iter = _selectionModels.begin();
+ while (iter != _selectionModels.end()) {
+ (*iter)->select(mapSelectionFromSource(currentSelection(), (*iter)), QItemSelectionModel::ClearAndSelect);
+ ++iter;
+ }
+ _changeSelectionEnabled = true;
}
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