+
+ 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));
+}
+
+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;
+}
+
+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;