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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QQmlTreeModelToTableModel_H
#define QQmlTreeModelToTableModel_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "qtqmlmodelsglobal_p.h"
#include <QtCore/qset.h>
#include <QtCore/qpointer.h>
#include <QtCore/qabstractitemmodel.h>
#include <QtCore/qitemselectionmodel.h>
QT_BEGIN_NAMESPACE
class QAbstractItemModel;
class Q_QMLMODELS_EXPORT QQmlTreeModelToTableModel : public QAbstractItemModel
{
Q_OBJECT
Q_PROPERTY(QAbstractItemModel *model READ model WRITE setModel NOTIFY modelChanged FINAL)
Q_PROPERTY(QModelIndex rootIndex READ rootIndex WRITE setRootIndex RESET resetRootIndex NOTIFY rootIndexChanged FINAL)
struct TreeItem;
public:
explicit QQmlTreeModelToTableModel(QObject *parent = nullptr);
QAbstractItemModel *model() const;
QModelIndex rootIndex() const;
void setRootIndex(const QModelIndex &idx);
void resetRootIndex();
QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const override;
QModelIndex parent(const QModelIndex &child) const override;
int rowCount(const QModelIndex &parent = QModelIndex()) const override;
int columnCount(const QModelIndex &parent = QModelIndex()) const override;
enum {
DepthRole = Qt::UserRole - 5,
ExpandedRole,
HasChildrenRole,
HasSiblingRole,
ModelIndexRole
};
QHash<int, QByteArray> roleNames() const override;
QVariant data(const QModelIndex &, int role) const override;
bool setData(const QModelIndex &index, const QVariant &value, int role) override;
QVariant headerData(int section, Qt::Orientation orientation, int role) const override;
Qt::ItemFlags flags(const QModelIndex &index) const override;
void clearModelData();
bool isVisible(const QModelIndex &index);
bool childrenVisible(const QModelIndex &index);
QModelIndex mapToModel(const QModelIndex &index) const;
QModelIndex mapFromModel(const QModelIndex &index) const;
QModelIndex mapToModel(int row) const;
Q_INVOKABLE QItemSelection selectionForRowRange(const QModelIndex &fromIndex, const QModelIndex &toIndex) const;
void showModelTopLevelItems(bool doInsertRows = true);
void showModelChildItems(const TreeItem &parent, int start, int end, bool doInsertRows = true, bool doExpandPendingRows = true);
int itemIndex(const QModelIndex &index) const;
void expandPendingRows(bool doInsertRows = true);
int lastChildIndex(const QModelIndex &index) const;
void removeVisibleRows(int startIndex, int endIndex, bool doRemoveRows = true);
void dump() const;
bool testConsistency(bool dumpOnFail = false) const;
using QAbstractItemModel::hasChildren;
Q_SIGNALS:
void modelChanged(QAbstractItemModel *model);
void rootIndexChanged();
void expanded(const QModelIndex &index);
void collapsed(const QModelIndex &index);
public Q_SLOTS:
void expand(const QModelIndex &);
void collapse(const QModelIndex &);
void setModel(QAbstractItemModel *model);
bool isExpanded(const QModelIndex &) const;
bool isExpanded(int row) const;
bool hasChildren(int row) const;
bool hasSiblings(int row) const;
int depthAtRow(int row) const;
void expandRow(int n);
void expandRecursively(int row, int depth);
void collapseRow(int n);
void collapseRecursively(int row);
private Q_SLOTS:
void modelHasBeenDestroyed();
void modelHasBeenReset();
void modelDataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles);
void modelLayoutAboutToBeChanged(const QList<QPersistentModelIndex> &parents, QAbstractItemModel::LayoutChangeHint hint);
void modelLayoutChanged(const QList<QPersistentModelIndex> &parents, QAbstractItemModel::LayoutChangeHint hint);
void modelRowsAboutToBeInserted(const QModelIndex & parent, int start, int end);
void modelRowsAboutToBeMoved(const QModelIndex & sourceParent, int sourceStart, int sourceEnd, const QModelIndex & destinationParent, int destinationRow);
void modelRowsAboutToBeRemoved(const QModelIndex & parent, int start, int end);
void modelRowsInserted(const QModelIndex & parent, int start, int end);
void modelRowsMoved(const QModelIndex & sourceParent, int sourceStart, int sourceEnd, const QModelIndex & destinationParent, int destinationRow);
void modelRowsRemoved(const QModelIndex & parent, int start, int end);
void modelColumnsAboutToBeInserted(const QModelIndex & parent, int start, int end);
void modelColumnsAboutToBeRemoved(const QModelIndex & parent, int start, int end);
void modelColumnsInserted(const QModelIndex & parent, int start, int end);
void modelColumnsRemoved(const QModelIndex & parent, int start, int end);
private:
struct TreeItem {
QPersistentModelIndex index;
int depth;
bool expanded;
explicit TreeItem(const QModelIndex &idx = QModelIndex(), int d = 0, int e = false)
: index(idx), depth(d), expanded(e)
{ }
inline bool operator== (const TreeItem &other) const
{
return this->index == other.index;
}
};
struct DataChangedParams {
QModelIndex topLeft;
QModelIndex bottomRight;
QVector<int> roles;
};
struct SignalFreezer {
SignalFreezer(QQmlTreeModelToTableModel *parent) : m_parent(parent) {
m_parent->enableSignalAggregation();
}
~SignalFreezer() { m_parent->disableSignalAggregation(); }
private:
QQmlTreeModelToTableModel *m_parent;
};
void enableSignalAggregation();
void disableSignalAggregation();
bool isAggregatingSignals() const { return m_signalAggregatorStack > 0; }
void queueDataChanged(const QModelIndex &topLeft,
const QModelIndex &bottomRight,
const QVector<int> &roles);
void emitQueuedSignals();
void connectToModel();
QPointer<QAbstractItemModel> m_model = nullptr;
QPersistentModelIndex m_rootIndex;
QList<TreeItem> m_items;
QSet<QPersistentModelIndex> m_expandedItems;
QList<TreeItem> m_itemsToExpand;
mutable int m_lastItemIndex = 0;
bool m_visibleRowsMoved = false;
bool m_modelLayoutChanged = false;
int m_signalAggregatorStack = 0;
QVector<DataChangedParams> m_queuedDataChanged;
std::array<QMetaObject::Connection, 15> m_connections;
int m_column = 0;
};
QT_END_NAMESPACE
#endif // QQmlTreeModelToTableModel_H
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