120 lines
4.6 KiB
C++
120 lines
4.6 KiB
C++
/*
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* Strawberry Music Player
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* This file was part of Clementine.
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* Copyright 2010, David Sansome <me@davidsansome.com>
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* Copyright 2019-2021, Jonas Kvinge <jonas@jkvinge.net>
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*
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* Strawberry is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Strawberry is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Strawberry. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef MERGEDPROXYMODEL_H
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#define MERGEDPROXYMODEL_H
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#include "config.h"
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#include <cstddef>
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#include <QObject>
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#include <QAbstractItemModel>
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#include <QAbstractProxyModel>
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#include <QMap>
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#include <QHash>
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#include <QVariant>
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#include <QString>
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#include <QStringList>
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#include "core/scoped_ptr.h"
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class QMimeData;
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std::size_t hash_value(const QModelIndex &idx);
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class MergedProxyModelPrivate;
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class MergedProxyModel : public QAbstractProxyModel {
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Q_OBJECT
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public:
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explicit MergedProxyModel(QObject *parent = nullptr);
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~MergedProxyModel() override;
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// Make another model appear as a child of the given item in the source model.
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void AddSubModel(const QModelIndex &source_parent, QAbstractItemModel *submodel);
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void RemoveSubModel(const QModelIndex &source_parent);
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// Find the item in the source model that is the parent of the model containing proxy_index.
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// If proxy_index is in the source model, then this just returns mapToSource(proxy_index).
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QModelIndex FindSourceParent(const QModelIndex &proxy_index) const;
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// QAbstractItemModel
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QModelIndex index(int row, int column, const QModelIndex &parent) const override;
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QModelIndex parent(const QModelIndex &child) const override;
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int rowCount(const QModelIndex &parent) const override;
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int columnCount(const QModelIndex &parent) const override;
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QVariant data(const QModelIndex &proxy_index, int role = Qt::DisplayRole) const override;
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bool hasChildren(const QModelIndex &parent) const override;
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QMap<int, QVariant> itemData(const QModelIndex &proxy_index) const override;
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Qt::ItemFlags flags(const QModelIndex &idx) const override;
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bool setData(const QModelIndex &idx, const QVariant &value, int role) override;
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QStringList mimeTypes() const override;
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QMimeData *mimeData(const QModelIndexList &indexes) const override;
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bool dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent) override;
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bool canFetchMore(const QModelIndex &parent) const override;
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void fetchMore(const QModelIndex &parent) override;
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// QAbstractProxyModel
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// Note that these implementations of map{To,From}Source will not always give you an index in sourceModel(),
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// you might get an index in one of the child models instead.
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QModelIndex mapFromSource(const QModelIndex &source_index) const override;
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QModelIndex mapToSource(const QModelIndex &proxy_index) const override;
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void setSourceModel(QAbstractItemModel *source_model) override;
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// Convenience functions that call map{To,From}Source multiple times.
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QModelIndexList mapFromSource(const QModelIndexList &source_indexes) const;
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QModelIndexList mapToSource(const QModelIndexList &proxy_indexes) const;
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signals:
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void SubModelReset(const QModelIndex root, QAbstractItemModel *model);
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private slots:
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void SourceModelReset();
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void SubModelAboutToBeReset();
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void SubModelResetSlot();
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void RowsAboutToBeInserted(const QModelIndex &source_parent, int start, int end);
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void RowsInserted(const QModelIndex &source_parent, int start, int end);
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void RowsAboutToBeRemoved(const QModelIndex &source_parent, int start, int end);
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void RowsRemoved(const QModelIndex &source_parent, int start, int end);
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void DataChanged(const QModelIndex &top_left, const QModelIndex &bottom_right);
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void LayoutAboutToBeChanged();
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void LayoutChanged();
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private:
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QModelIndex GetActualSourceParent(const QModelIndex &source_parent, QAbstractItemModel *model) const;
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QAbstractItemModel *GetModel(const QModelIndex &source_index) const;
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void DeleteAllMappings();
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bool IsKnownModel(const QAbstractItemModel *model) const;
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QHash<QAbstractItemModel*, QPersistentModelIndex> merge_points_;
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QAbstractItemModel *resetting_model_;
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QHash<QAbstractItemModel*, QModelIndex> old_merge_points_;
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ScopedPtr<MergedProxyModelPrivate> p_;
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};
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#endif // MERGEDPROXYMODEL_H
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