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50
51#ifndef DOCUMENT_H
52#define DOCUMENT_H
53
54#include <QWidget>
55
56QT_FORWARD_DECLARE_CLASS(QUndoStack)
57QT_FORWARD_DECLARE_CLASS(QTextStream)
58
59class Shape
60{
61public:
62 enum Type { Rectangle, Circle, Triangle };
63
64 explicit Shape(Type type = Rectangle, const QColor &color = Qt::red, const QRect &rect = QRect());
65
66 Type type() const;
67 QString name() const;
68 QRect rect() const;
69 QRect resizeHandle() const;
70 QColor color() const;
71
72 static QString typeToString(Type type);
73 static Type stringToType(const QString &s, bool *ok = nullptr);
74
75 static const QSize minSize;
76
77private:
78 Type m_type;
79 QRect m_rect;
80 QColor m_color;
81 QString m_name;
82
83 friend class Document;
84};
85
86class Document : public QWidget
87{
88 Q_OBJECT
89
90public:
91 Document(QWidget *parent = nullptr);
92
93 QString addShape(const Shape &shape);
94 void deleteShape(const QString &shapeName);
95 Shape shape(const QString &shapeName) const;
96 QString currentShapeName() const;
97
98 void setShapeRect(const QString &shapeName, const QRect &rect);
99 void setShapeColor(const QString &shapeName, const QColor &color);
100
101 bool load(QTextStream &stream);
102 void save(QTextStream &stream);
103
104 QString fileName() const;
105 void setFileName(const QString &fileName);
106
107 QUndoStack *undoStack() const;
108
109signals:
110 void currentShapeChanged(const QString &shapeName);
111
112protected:
113 void paintEvent(QPaintEvent *event) override;
114 void mousePressEvent(QMouseEvent *event) override;
115 void mouseReleaseEvent(QMouseEvent *event) override;
116 void mouseMoveEvent(QMouseEvent *event) override;
117
118private:
119 void setCurrentShape(int index);
120 int indexOf(const QString &shapeName) const;
121 int indexAt(const QPoint &pos) const;
122 QString uniqueName(const QString &name) const;
123
124 QVector<Shape> m_shapeList;
125 QPoint m_mousePressOffset;
126 QString m_fileName;
127 QUndoStack *m_undoStack = nullptr;
128 int m_currentIndex = -1;
129 int m_mousePressIndex = -1;
130 bool m_resizeHandlePressed = false;
131};
132
133#endif // DOCUMENT_H
134

source code of qtbase/examples/widgets/tools/undo/document.h