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/*
    Copyright (c) 2010 Stephen Kelly <steveire@gmail.com>

    This library is free software; you can redistribute it and/or modify it
    under the terms of the GNU Library General Public License as published by
    the Free Software Foundation; either version 2 of the License, or (at your
    option) any later version.

    This library is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
    License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to the
    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301, USA.
*/
#ifndef KCHECKABLEPROXYMODEL_H
#define KCHECKABLEPROXYMODEL_H

#include "kitemmodels_export.h"

#include <QtCore/QItemSelection>
#include <QtCore/QIdentityProxyModel>

class KCheckableProxyModelPrivate;

/**
 * @class KCheckableProxyModel kcheckableproxymodel.h KCheckableProxyModel
 *
 * @brief Adds a checkable capability to a source model
 *
 * Items is standard Qt views such as QTreeView and QListView can have a
 * checkable capability and draw checkboxes. Adding such a capability
 * requires specific implementations of the data() and flags() virtual methods.
 * This class implements those methods generically so that it is not necessary to
 * implement them in your model.
 *
 * This can be combined with a KSelectionProxyModel showing the items currently selected
 *
 * @code
 *
 *   QItemSelectionModel *checkModel = new QItemSelectionModel(rootModel, this);
 *   KCheckableProxyModel *checkable = new KCheckableProxyModel(this);
 *   checkable->setSourceModel(rootModel);
 *   checkable->setSelectionModel(checkModel);
 *
 *   QTreeView *tree1 = new QTreeView(vSplitter);
 *   tree1->setModel(checkable);
 *   tree1->expandAll();
 *
 *   KSelectionProxyModel *selectionProxy = new KSelectionProxyModel(checkModel, this);
 *   selectionProxy->setFilterBehavior(KSelectionProxyModel::ExactSelection);
 *   selectionProxy->setSourceModel(rootModel);
 *
 *   QTreeView *tree2 = new QTreeView(vSplitter);
 *   tree2->setModel(selectionProxy);
 * @endcode
 *
 * @image html kcheckableproxymodel.png "A KCheckableProxyModel and KSelectionProxyModel showing checked items"
 *
 * @since 4.6
 * @author Stephen Kelly <steveire@gmail.com>
 */
class KITEMMODELS_EXPORT KCheckableProxyModel : public QIdentityProxyModel
{
    Q_OBJECT
public:
    KCheckableProxyModel(QObject *parent = nullptr);
    ~KCheckableProxyModel();

    void setSelectionModel(QItemSelectionModel *itemSelectionModel);
    QItemSelectionModel *selectionModel() const;

    /* reimp */ Qt::ItemFlags flags(const QModelIndex &index) const Q_DECL_OVERRIDE;

    /* reimp */ QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const Q_DECL_OVERRIDE;

    /* reimp */ bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole) Q_DECL_OVERRIDE;

    /* reimp */ void setSourceModel(QAbstractItemModel *sourceModel) Q_DECL_OVERRIDE;

protected:
    virtual bool select(const QItemSelection &selection, QItemSelectionModel::SelectionFlags command);

private:
    Q_DECLARE_PRIVATE(KCheckableProxyModel)
    KCheckableProxyModelPrivate *const d_ptr;

    Q_PRIVATE_SLOT(d_func(), void selectionChanged(const QItemSelection &, const QItemSelection &))
};

#endif