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39
40#ifndef QUNDOSTACK_H
41#define QUNDOSTACK_H
42
43#include <QtWidgets/qtwidgetsglobal.h>
44#include <QtCore/qobject.h>
45#include <QtCore/qstring.h>
46
47QT_REQUIRE_CONFIG(undocommand);
48
49QT_BEGIN_NAMESPACE
50
51class QAction;
52class QUndoCommandPrivate;
53class QUndoStackPrivate;
54
55class Q_WIDGETS_EXPORT QUndoCommand
56{
57 QUndoCommandPrivate *d;
58
59public:
60 explicit QUndoCommand(QUndoCommand *parent = nullptr);
61 explicit QUndoCommand(const QString &text, QUndoCommand *parent = nullptr);
62 virtual ~QUndoCommand();
63
64 virtual void undo();
65 virtual void redo();
66
67 QString text() const;
68 QString actionText() const;
69 void setText(const QString &text);
70
71 bool isObsolete() const;
72 void setObsolete(bool obsolete);
73
74 virtual int id() const;
75 virtual bool mergeWith(const QUndoCommand *other);
76
77 int childCount() const;
78 const QUndoCommand *child(int index) const;
79
80private:
81 Q_DISABLE_COPY(QUndoCommand)
82 friend class QUndoStack;
83};
84
85#if QT_CONFIG(undostack)
86
87class Q_WIDGETS_EXPORT QUndoStack : public QObject
88{
89 Q_OBJECT
90 Q_DECLARE_PRIVATE(QUndoStack)
91 Q_PROPERTY(bool active READ isActive WRITE setActive)
92 Q_PROPERTY(int undoLimit READ undoLimit WRITE setUndoLimit)
93 Q_PROPERTY(bool canUndo READ canUndo NOTIFY canUndoChanged)
94 Q_PROPERTY(bool canRedo READ canRedo NOTIFY canRedoChanged)
95 Q_PROPERTY(QString undoText READ undoText NOTIFY undoTextChanged)
96 Q_PROPERTY(QString redoText READ redoText NOTIFY redoTextChanged)
97 Q_PROPERTY(bool clean READ isClean NOTIFY cleanChanged)
98
99public:
100 explicit QUndoStack(QObject *parent = nullptr);
101 ~QUndoStack();
102 void clear();
103
104 void push(QUndoCommand *cmd);
105
106 bool canUndo() const;
107 bool canRedo() const;
108 QString undoText() const;
109 QString redoText() const;
110
111 int count() const;
112 int index() const;
113 QString text(int idx) const;
114
115#ifndef QT_NO_ACTION
116 QAction *createUndoAction(QObject *parent,
117 const QString &prefix = QString()) const;
118 QAction *createRedoAction(QObject *parent,
119 const QString &prefix = QString()) const;
120#endif // QT_NO_ACTION
121
122 bool isActive() const;
123 bool isClean() const;
124 int cleanIndex() const;
125
126 void beginMacro(const QString &text);
127 void endMacro();
128
129 void setUndoLimit(int limit);
130 int undoLimit() const;
131
132 const QUndoCommand *command(int index) const;
133
134public Q_SLOTS:
135 void setClean();
136 void resetClean();
137 void setIndex(int idx);
138 void undo();
139 void redo();
140 void setActive(bool active = true);
141
142Q_SIGNALS:
143 void indexChanged(int idx);
144 void cleanChanged(bool clean);
145 void canUndoChanged(bool canUndo);
146 void canRedoChanged(bool canRedo);
147 void undoTextChanged(const QString &undoText);
148 void redoTextChanged(const QString &redoText);
149
150private:
151 Q_DISABLE_COPY(QUndoStack)
152 friend class QUndoGroup;
153};
154
155#endif // QT_CONFIG(undostack)
156
157QT_END_NAMESPACE
158
159#endif // QUNDOSTACK_H
160

source code of qtbase/src/widgets/util/qundostack.h