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

117 lines
4.5 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 <cstddef>
#include <QObject>
#include <QAbstractItemModel>
#include <QAbstractProxyModel>
#include <QMap>
#include <QVariant>
#include <QString>
#include <QStringList>
class QMimeData;
std::size_t hash_value(const QModelIndex &index);
class MergedProxyModelPrivate;
class MergedProxyModel : public QAbstractProxyModel {
Q_OBJECT
public:
explicit MergedProxyModel(QObject *parent = nullptr);
~MergedProxyModel() override;
// 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 override;
QModelIndex parent(const QModelIndex &child) const override;
int rowCount(const QModelIndex &parent) const override;
int columnCount(const QModelIndex &parent) const override;
QVariant data(const QModelIndex &proxy_index, int role = Qt::DisplayRole) const override;
bool hasChildren(const QModelIndex &parent) const override;
QMap<int, QVariant> itemData(const QModelIndex &proxy_index) const override;
Qt::ItemFlags flags(const QModelIndex &index) const override;
bool setData(const QModelIndex &index, const QVariant &value, int role) override;
QStringList mimeTypes() const override;
QMimeData *mimeData(const QModelIndexList &indexes) const override;
bool dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent) override;
bool canFetchMore(const QModelIndex &parent) const override;
void fetchMore(const QModelIndex &parent) override;
// 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 &source_index) const override;
QModelIndex mapToSource(const QModelIndex &proxy_index) const override;
void setSourceModel(QAbstractItemModel *source_model) override;
// 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