Qt Reference Documentation

qcontext2dcanvas.cpp Example File

script/context2d/qcontext2dcanvas.cpp
 /****************************************************************************
 **
 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** You may use this file under the terms of the BSD license as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
 **     the names of its contributors may be used to endorse or promote
 **     products derived from this software without specific prior written
 **     permission.
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include "qcontext2dcanvas.h"

 #include "context2d.h"
 #include "environment.h"
 #include "domimage.h"

 #include <QPainter>
 #include <QPaintEvent>

 QContext2DCanvas::QContext2DCanvas(Context2D *context, Environment *env, QWidget *parent)
     : QWidget(parent), m_context(context), m_env(env)
 {
     QObject::connect(context, SIGNAL(changed(QImage)), this, SLOT(contentsChanged(QImage)));
     setMouseTracking(true);
 }

 QContext2DCanvas::~QContext2DCanvas()
 {
 }

 Context2D *QContext2DCanvas::context() const
 {
     return m_context;
 }

 QScriptValue QContext2DCanvas::getContext(const QString &str)
 {
     if (str != "2d")
         return QScriptValue();
     return m_env->toWrapper(m_context);
 }

 void QContext2DCanvas::contentsChanged(const QImage &image)
 {
     m_image = image;
     update();
 }

 void QContext2DCanvas::paintEvent(QPaintEvent *e)
 {
     QPainter p(this);
 #ifdef Q_WS_S60
 // Draw white rect first since in with some themes the js-file content will produce black-on-black.
     QBrush whiteBgBrush(Qt::white);
     p.fillRect(e->rect(), whiteBgBrush);
 #endif
     p.setClipRect(e->rect());
     p.drawImage(0, 0, m_image);
 }

 void QContext2DCanvas::mouseMoveEvent(QMouseEvent *e)
 {
     m_env->handleEvent(this, e);
 }

 void QContext2DCanvas::mousePressEvent(QMouseEvent *e)
 {
     m_env->handleEvent(this, e);
 }

 void QContext2DCanvas::mouseReleaseEvent(QMouseEvent *e)
 {
     m_env->handleEvent(this, e);
 }

 void QContext2DCanvas::keyPressEvent(QKeyEvent *e)
 {
     m_env->handleEvent(this, e);
 }

 void QContext2DCanvas::keyReleaseEvent(QKeyEvent *e)
 {
     m_env->handleEvent(this, e);
 }

 void QContext2DCanvas::resizeEvent(QResizeEvent *e)
 {
     m_context->setSize(e->size().width(), e->size().height());
 }

 void QContext2DCanvas::resize(int width, int height)
 {
     QWidget::resize(width, height);
 }

 void QContext2DCanvas::reset()
 {
     m_context->reset();
 }

 void QContext2DCanvas::addEventListener(const QString &type, const QScriptValue &listener,
                                         bool useCapture)
 {
     Q_UNUSED(useCapture);
     if (listener.isFunction()) {
         QScriptValue self = m_env->toWrapper(this);
         self.setProperty("on" + type, listener);
     }
 }
X

Thank you for giving your feedback.

Make sure it is related to this specific page. For more general bugs and requests, please use the Qt Bug Tracker.

[0]; s.parentNode.insertBefore(ga, s); })();