File indexing completed on 2025-04-20 06:44:16

 /*
     SPDX-FileCopyrightText: 2010 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.net>
     SPDX-FileContributor: Stephen Kelly <stephen@kdab.com>
     SPDX-FileCopyrightText: 2016 Ableton AG <info@ableton.com>
     SPDX-FileContributor: Stephen Kelly <stephen.kelly@ableton.com>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #ifndef KLINKITEMSELECTIONMODEL_H
 #define KLINKITEMSELECTIONMODEL_H
 
 #include <QItemSelectionModel>
 
 #include "kitemmodels_export.h"
 
 #include <memory>
 
 class KLinkItemSelectionModelPrivate;
 
 /**
   @class KLinkItemSelectionModel klinkitemselectionmodel.h KLinkItemSelectionModel
 
   @brief Makes it possible to share a selection in multiple views which do not have the same source model
 
   Although <a href="https://doc.qt.io/qt-5/model-view-programming.html#handling-selections-of-items">multiple views can share the same QItemSelectionModel</a>,
   the views then need to have the same source model.
 
   If there is a proxy model between the model and one of the views, or different proxy models in each, this class makes
   it possible to share the selection between the views.
 
   @image html kproxyitemselectionmodel-simple.png "Sharing a QItemSelectionModel between views on the same model is trivial"
   @image html kproxyitemselectionmodel-error.png "If a proxy model is used, it is no longer possible to share the QItemSelectionModel directly"
   @image html kproxyitemselectionmodel-solution.png "A KLinkItemSelectionModel can be used to map the selection through the proxy model"
 
   @code
     QAbstractItemModel *model = getModel();
 
     QSortFilterProxyModel *proxy = new QSortFilterProxyModel();
     proxy->setSourceModel(model);
 
     QTreeView *view1 = new QTreeView(splitter);
     view1->setModel(model);
 
     KLinkItemSelectionModel *view2SelectionModel = new KLinkItemSelectionModel( proxy, view1->selectionModel());
 
     QTreeView *view2 = new QTreeView(splitter);
     // Note that the QAbstractItemModel passed to KLinkItemSelectionModel must be the same as what is used in the view
     view2->setModel(proxy);
     view2->setSelectionModel( view2SelectionModel );
   @endcode
 
   @image html kproxyitemselectionmodel-complex.png "Arbitrarily complex proxy configurations on the same root model can be used"
 
   @code
     QAbstractItemModel *model = getModel();
 
     QSortFilterProxyModel *proxy1 = new QSortFilterProxyModel();
     proxy1->setSourceModel(model);
     QSortFilterProxyModel *proxy2 = new QSortFilterProxyModel();
     proxy2->setSourceModel(proxy1);
     QSortFilterProxyModel *proxy3 = new QSortFilterProxyModel();
     proxy3->setSourceModel(proxy2);
 
     QTreeView *view1 = new QTreeView(splitter);
     view1->setModel(proxy3);
 
     QSortFilterProxyModel *proxy4 = new QSortFilterProxyModel();
     proxy4->setSourceModel(model);
     QSortFilterProxyModel *proxy5 = new QSortFilterProxyModel();
     proxy5->setSourceModel(proxy4);
 
     KLinkItemSelectionModel *view2SelectionModel = new KLinkItemSelectionModel( proxy5, view1->selectionModel());
 
     QTreeView *view2 = new QTreeView(splitter);
     // Note that the QAbstractItemModel passed to KLinkItemSelectionModel must be the same as what is used in the view
     view2->setModel(proxy5);
     view2->setSelectionModel( view2SelectionModel );
   @endcode
 
   See also <a href="https://commits.kde.org/kitemmodels?path=tests/proxymodeltestapp/proxyitemselectionwidget.cpp">kitemmodels:
   tests/proxymodeltestapp/proxyitemselectionwidget.cpp</a>.
 
   @since 4.5
   @author Stephen Kelly <steveire@gmail.com>
 
 */
 class KITEMMODELS_EXPORT KLinkItemSelectionModel : public QItemSelectionModel
 {
     Q_OBJECT
     Q_PROPERTY(
         QItemSelectionModel *linkedItemSelectionModel READ linkedItemSelectionModel WRITE setLinkedItemSelectionModel NOTIFY linkedItemSelectionModelChanged)
 public:
     /**
       Constructor.
     */
     KLinkItemSelectionModel(QAbstractItemModel *targetModel, QItemSelectionModel *linkedItemSelectionModel, QObject *parent = nullptr);
 
     explicit KLinkItemSelectionModel(QObject *parent = nullptr);
 
     ~KLinkItemSelectionModel() override;
 
     QItemSelectionModel *linkedItemSelectionModel() const;
     void setLinkedItemSelectionModel(QItemSelectionModel *selectionModel);
 
     void select(const QModelIndex &index, QItemSelectionModel::SelectionFlags command) override;
     void select(const QItemSelection &selection, QItemSelectionModel::SelectionFlags command) override;
 
 Q_SIGNALS:
     void linkedItemSelectionModelChanged();
 
 protected:
     std::unique_ptr<KLinkItemSelectionModelPrivate> const d_ptr;
 
 private:
     Q_DECLARE_PRIVATE(KLinkItemSelectionModel)
     Q_PRIVATE_SLOT(d_func(), void sourceSelectionChanged(const QItemSelection &selected, const QItemSelection &deselected))
     Q_PRIVATE_SLOT(d_func(), void sourceCurrentChanged(const QModelIndex &current))
     Q_PRIVATE_SLOT(d_func(), void slotCurrentChanged(const QModelIndex &current))
 };
 
 #endif