1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the examples of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:BSD$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** BSD License Usage
18** Alternatively, you may use this file under the terms of the BSD license
19** as follows:
20**
21** "Redistribution and use in source and binary forms, with or without
22** modification, are permitted provided that the following conditions are
23** met:
24** * Redistributions of source code must retain the above copyright
25** notice, this list of conditions and the following disclaimer.
26** * Redistributions in binary form must reproduce the above copyright
27** notice, this list of conditions and the following disclaimer in
28** the documentation and/or other materials provided with the
29** distribution.
30** * Neither the name of The Qt Company Ltd nor the names of its
31** contributors may be used to endorse or promote products derived
32** from this software without specific prior written permission.
33**
34**
35** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
36** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
37** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
38** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
39** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
42** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
43** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
44** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
45** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
46**
47** $QT_END_LICENSE$
48**
49****************************************************************************/
50
51#ifndef DIAGRAMSCENE_H
52#define DIAGRAMSCENE_H
53
54#include "diagramitem.h"
55#include "diagramtextitem.h"
56
57#include <QGraphicsScene>
58
59QT_BEGIN_NAMESPACE
60class QGraphicsSceneMouseEvent;
61class QMenu;
62class QPointF;
63class QGraphicsLineItem;
64class QFont;
65class QGraphicsTextItem;
66class QColor;
67QT_END_NAMESPACE
68
69//! [0]
70class DiagramScene : public QGraphicsScene
71{
72 Q_OBJECT
73
74public:
75 enum Mode { InsertItem, InsertLine, InsertText, MoveItem };
76
77 explicit DiagramScene(QMenu *itemMenu, QObject *parent = nullptr);
78 QFont font() const { return myFont; }
79 QColor textColor() const { return myTextColor; }
80 QColor itemColor() const { return myItemColor; }
81 QColor lineColor() const { return myLineColor; }
82 void setLineColor(const QColor &color);
83 void setTextColor(const QColor &color);
84 void setItemColor(const QColor &color);
85 void setFont(const QFont &font);
86
87public slots:
88 void setMode(Mode mode);
89 void setItemType(DiagramItem::DiagramType type);
90 void editorLostFocus(DiagramTextItem *item);
91
92signals:
93 void itemInserted(DiagramItem *item);
94 void textInserted(QGraphicsTextItem *item);
95 void itemSelected(QGraphicsItem *item);
96
97protected:
98 void mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent) override;
99 void mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent) override;
100 void mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent) override;
101
102private:
103 bool isItemChange(int type) const;
104
105 DiagramItem::DiagramType myItemType;
106 QMenu *myItemMenu;
107 Mode myMode;
108 bool leftButtonDown;
109 QPointF startPoint;
110 QGraphicsLineItem *line;
111 QFont myFont;
112 DiagramTextItem *textItem;
113 QColor myTextColor;
114 QColor myItemColor;
115 QColor myLineColor;
116};
117//! [0]
118
119#endif // DIAGRAMSCENE_H
120

source code of qtbase/examples/widgets/graphicsview/diagramscene/diagramscene.h