strawberry-audio-player-win.../src/core/mergedproxymodel.h

111 lines
4.2 KiB
C++

/*
* Strawberry Music Player
* This file was part of Clementine.
* Copyright 2010, David Sansome <me@davidsansome.com>
*
* Strawberry is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Strawberry 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Strawberry. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef MERGEDPROXYMODEL_H
#define MERGEDPROXYMODEL_H
#include "config.h"
#include <memory>
#include <QAbstractProxyModel>
std::size_t hash_value(const QModelIndex& index);
class MergedProxyModelPrivate;
class MergedProxyModel : public QAbstractProxyModel {
Q_OBJECT
public:
explicit MergedProxyModel(QObject* parent = nullptr);
~MergedProxyModel();
// Make another model appear as a child of the given item in the source model.
void AddSubModel(const QModelIndex& source_parent, QAbstractItemModel* submodel);
void RemoveSubModel(const QModelIndex& source_parent);
// Find the item in the source model that is the parent of the model
// containing proxy_index. If proxy_index is in the source model, then
// this just returns mapToSource(proxy_index).
QModelIndex FindSourceParent(const QModelIndex& proxy_index) const;
// QAbstractItemModel
QModelIndex index(int row, int column, const QModelIndex& parent) const;
QModelIndex parent(const QModelIndex& child) const;
int rowCount(const QModelIndex& parent) const;
int columnCount(const QModelIndex& parent) const;
QVariant data(const QModelIndex &proxyIndex, int role = Qt::DisplayRole) const;
bool hasChildren(const QModelIndex& parent) const;
QMap<int, QVariant> itemData(const QModelIndex& proxyIndex) const;
Qt::ItemFlags flags(const QModelIndex& index) const;
bool setData(const QModelIndex& index, const QVariant& value, int role);
QStringList mimeTypes() const;
QMimeData* mimeData(const QModelIndexList& indexes) const;
bool dropMimeData(const QMimeData* data, Qt::DropAction action, int row, int column, const QModelIndex& parent);
bool canFetchMore(const QModelIndex& parent) const;
void fetchMore(const QModelIndex& parent);
// QAbstractProxyModel
// Note that these implementations of map{To,From}Source will not always
// give you an index in sourceModel(), you might get an index in one of the
// child models instead.
QModelIndex mapFromSource(const QModelIndex& sourceIndex) const;
QModelIndex mapToSource(const QModelIndex& proxyIndex) const;
void setSourceModel(QAbstractItemModel* sourceModel);
// Convenience functions that call map{To,From}Source multiple times.
QModelIndexList mapFromSource(const QModelIndexList& source_indexes) const;
QModelIndexList mapToSource(const QModelIndexList& proxy_indexes) const;
signals:
void SubModelReset(const QModelIndex& root, QAbstractItemModel* model);
private slots:
void SourceModelReset();
void SubModelReset();
void RowsAboutToBeInserted(const QModelIndex& source_parent, int start, int end);
void RowsInserted(const QModelIndex& source_parent, int start, int end);
void RowsAboutToBeRemoved(const QModelIndex& source_parent, int start, int end);
void RowsRemoved(const QModelIndex& source_parent, int start, int end);
void DataChanged(const QModelIndex& top_left, const QModelIndex& bottom_right);
void LayoutAboutToBeChanged();
void LayoutChanged();
private:
QModelIndex GetActualSourceParent(const QModelIndex& source_parent,
QAbstractItemModel* model) const;
QAbstractItemModel* GetModel(const QModelIndex& source_index) const;
void DeleteAllMappings();
bool IsKnownModel(const QAbstractItemModel* model) const;
QMap<QAbstractItemModel*, QPersistentModelIndex> merge_points_;
QAbstractItemModel* resetting_model_;
QMap<QAbstractItemModel*, QModelIndex> old_merge_points_;
std::unique_ptr<MergedProxyModelPrivate> p_;
};
#endif // MERGEDPROXYMODEL_H