1/****************************************************************************
2**
3** Copyright (C) 2017 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 "qcontext2dcanvas.h"
52
53#include "context2d.h"
54#include "environment.h"
55#include "domimage.h"
56
57#include <QPainter>
58#include <QPaintEvent>
59
60//! [3]
61QContext2DCanvas::QContext2DCanvas(Context2D *context, Environment *env, QWidget *parent)
62 : QWidget(parent), m_context(context), m_env(env)
63{
64 QObject::connect(sender: context, SIGNAL(changed(QImage)), receiver: this, SLOT(contentsChanged(QImage)));
65 setMouseTracking(true);
66}
67//! [3]
68
69QContext2DCanvas::~QContext2DCanvas()
70{
71}
72
73Context2D *QContext2DCanvas::context() const
74{
75 return m_context;
76}
77
78//! [0]
79QScriptValue QContext2DCanvas::getContext(const QString &str)
80{
81 if (str != "2d")
82 return QScriptValue();
83 return m_env->toWrapper(object: m_context);
84}
85//! [0]
86
87//! [1]
88void QContext2DCanvas::contentsChanged(const QImage &image)
89{
90 m_image = image;
91 update();
92}
93
94void QContext2DCanvas::paintEvent(QPaintEvent *e)
95{
96 QPainter p(this);
97 p.setClipRect(e->rect());
98 p.drawImage(x: 0, y: 0, image: m_image);
99}
100//! [1]
101
102//! [2]
103void QContext2DCanvas::mouseMoveEvent(QMouseEvent *e)
104{
105 m_env->handleEvent(canvas: this, e);
106}
107
108void QContext2DCanvas::mousePressEvent(QMouseEvent *e)
109{
110 m_env->handleEvent(canvas: this, e);
111}
112
113void QContext2DCanvas::mouseReleaseEvent(QMouseEvent *e)
114{
115 m_env->handleEvent(canvas: this, e);
116}
117
118void QContext2DCanvas::keyPressEvent(QKeyEvent *e)
119{
120 m_env->handleEvent(canvas: this, e);
121}
122
123void QContext2DCanvas::keyReleaseEvent(QKeyEvent *e)
124{
125 m_env->handleEvent(canvas: this, e);
126}
127//! [2]
128
129void QContext2DCanvas::resizeEvent(QResizeEvent *e)
130{
131 m_context->setSize(width: e->size().width(), height: e->size().height());
132}
133
134void QContext2DCanvas::resize(int width, int height)
135{
136 QWidget::resize(w: width, h: height);
137}
138
139void QContext2DCanvas::reset()
140{
141 m_context->reset();
142}
143
144void QContext2DCanvas::addEventListener(const QString &type, const QScriptValue &listener,
145 bool useCapture)
146{
147 Q_UNUSED(useCapture);
148 if (listener.isFunction()) {
149 QScriptValue self = m_env->toWrapper(object: this);
150 self.setProperty(name: "on" + type, value: listener);
151 }
152}
153

source code of qtscript/examples/script/context2d/qcontext2dcanvas.cpp