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// Copyright (C) 2020 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 QUNDOSTACK_H
#define QUNDOSTACK_H
#include <QtGui/qtguiglobal.h>
#include <QtCore/qobject.h>
#include <QtCore/qstring.h>
QT_REQUIRE_CONFIG(undocommand);
QT_BEGIN_NAMESPACE
class QAction;
class QUndoCommandPrivate;
class QUndoStackPrivate;
class Q_GUI_EXPORT QUndoCommand
{
QUndoCommandPrivate *d;
public:
explicit QUndoCommand(QUndoCommand *parent = nullptr);
explicit QUndoCommand(const QString &text, QUndoCommand *parent = nullptr);
virtual ~QUndoCommand();
virtual void undo();
virtual void redo();
QString text() const;
QString actionText() const;
void setText(const QString &text);
bool isObsolete() const;
void setObsolete(bool obsolete);
virtual int id() const;
virtual bool mergeWith(const QUndoCommand *other);
int childCount() const;
const QUndoCommand *child(int index) const;
private:
Q_DISABLE_COPY(QUndoCommand)
friend class QUndoStack;
};
#if QT_CONFIG(undostack)
class Q_GUI_EXPORT QUndoStack : public QObject
{
Q_OBJECT
Q_DECLARE_PRIVATE(QUndoStack)
Q_PROPERTY(bool active READ isActive WRITE setActive)
Q_PROPERTY(int undoLimit READ undoLimit WRITE setUndoLimit)
Q_PROPERTY(bool canUndo READ canUndo NOTIFY canUndoChanged)
Q_PROPERTY(bool canRedo READ canRedo NOTIFY canRedoChanged)
Q_PROPERTY(QString undoText READ undoText NOTIFY undoTextChanged)
Q_PROPERTY(QString redoText READ redoText NOTIFY redoTextChanged)
Q_PROPERTY(bool clean READ isClean NOTIFY cleanChanged)
public:
explicit QUndoStack(QObject *parent = nullptr);
~QUndoStack();
void clear();
void push(QUndoCommand *cmd);
bool canUndo() const;
bool canRedo() const;
QString undoText() const;
QString redoText() const;
int count() const;
int index() const;
QString text(int idx) const;
#ifndef QT_NO_ACTION
QAction *createUndoAction(QObject *parent, const QString &prefix = QString()) const;
QAction *createRedoAction(QObject *parent, const QString &prefix = QString()) const;
#endif // QT_NO_ACTION
bool isActive() const;
bool isClean() const;
int cleanIndex() const;
void beginMacro(const QString &text);
void endMacro();
void setUndoLimit(int limit);
int undoLimit() const;
const QUndoCommand *command(int index) const;
public Q_SLOTS:
void setClean();
void resetClean();
void setIndex(int idx);
void undo();
void redo();
void setActive(bool active = true);
Q_SIGNALS:
void indexChanged(int idx);
void cleanChanged(bool clean);
void canUndoChanged(bool canUndo);
void canRedoChanged(bool canRedo);
void undoTextChanged(const QString &undoText);
void redoTextChanged(const QString &redoText);
private:
Q_DISABLE_COPY(QUndoStack)
friend class QUndoGroup;
};
#endif // QT_CONFIG(undostack)
QT_END_NAMESPACE
#endif // QUNDOSTACK_H
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