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 #include "diagramitem.h"
52 #include "arrow.h"
53
54 #include <QGraphicsScene>
55 #include <QGraphicsSceneContextMenuEvent>
56 #include <QMenu>
57 #include <QPainter>
58
59 //! [0]
DiagramItem(DiagramType diagramType,QMenu * contextMenu,QGraphicsItem * parent)60 DiagramItem::DiagramItem(DiagramType diagramType, QMenu *contextMenu,
61 QGraphicsItem *parent)
62 : QGraphicsPolygonItem(parent), myDiagramType(diagramType)
63 , myContextMenu(contextMenu)
64 {
65 QPainterPath path;
66 switch (myDiagramType) {
67 case StartEnd:
68 path.moveTo(200, 50);
69 path.arcTo(150, 0, 50, 50, 0, 90);
70 path.arcTo(50, 0, 50, 50, 90, 90);
71 path.arcTo(50, 50, 50, 50, 180, 90);
72 path.arcTo(150, 50, 50, 50, 270, 90);
73 path.lineTo(200, 25);
74 myPolygon = path.toFillPolygon();
75 break;
76 case Conditional:
77 myPolygon << QPointF(-100, 0) << QPointF(0, 100)
78 << QPointF(100, 0) << QPointF(0, -100)
79 << QPointF(-100, 0);
80 break;
81 case Step:
82 myPolygon << QPointF(-100, -100) << QPointF(100, -100)
83 << QPointF(100, 100) << QPointF(-100, 100)
84 << QPointF(-100, -100);
85 break;
86 default:
87 myPolygon << QPointF(-120, -80) << QPointF(-70, 80)
88 << QPointF(120, 80) << QPointF(70, -80)
89 << QPointF(-120, -80);
90 break;
91 }
92 setPolygon(myPolygon);
93 setFlag(QGraphicsItem::ItemIsMovable, true);
94 setFlag(QGraphicsItem::ItemIsSelectable, true);
95 setFlag(QGraphicsItem::ItemSendsGeometryChanges, true);
96 }
97 //! [0]
98
99 //! [1]
removeArrow(Arrow * arrow)100 void DiagramItem::removeArrow(Arrow *arrow)
101 {
102 arrows.removeAll(arrow);
103 }
104 //! [1]
105
106 //! [2]
removeArrows()107 void DiagramItem::removeArrows()
108 {
109 // need a copy here since removeArrow() will
110 // modify the arrows container
111 const auto arrowsCopy = arrows;
112 for (Arrow *arrow : arrowsCopy) {
113 arrow->startItem()->removeArrow(arrow);
114 arrow->endItem()->removeArrow(arrow);
115 scene()->removeItem(arrow);
116 delete arrow;
117 }
118 }
119 //! [2]
120
121 //! [3]
addArrow(Arrow * arrow)122 void DiagramItem::addArrow(Arrow *arrow)
123 {
124 arrows.append(arrow);
125 }
126 //! [3]
127
128 //! [4]
image() const129 QPixmap DiagramItem::image() const
130 {
131 QPixmap pixmap(250, 250);
132 pixmap.fill(Qt::transparent);
133 QPainter painter(&pixmap);
134 painter.setPen(QPen(Qt::black, 8));
135 painter.translate(125, 125);
136 painter.drawPolyline(myPolygon);
137
138 return pixmap;
139 }
140 //! [4]
141
142 //! [5]
contextMenuEvent(QGraphicsSceneContextMenuEvent * event)143 void DiagramItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
144 {
145 scene()->clearSelection();
146 setSelected(true);
147 myContextMenu->exec(event->screenPos());
148 }
149 //! [5]
150
151 //! [6]
itemChange(GraphicsItemChange change,const QVariant & value)152 QVariant DiagramItem::itemChange(GraphicsItemChange change, const QVariant &value)
153 {
154 if (change == QGraphicsItem::ItemPositionChange) {
155 for (Arrow *arrow : qAsConst(arrows))
156 arrow->updatePosition();
157 }
158
159 return value;
160 }
161 //! [6]
162