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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the test suite of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "pinchwidget.h"
#include <QPainter>
#include <QImage>
#include <QPixmap>
#include <QPanGesture>
#include <QPinchGesture>
#include <QPushButton>
PinchWidget::PinchWidget(const QImage &image, QWidget *parent)
: QWidget(parent)
{
setMinimumSize(100,100);
this->image = image;
pan = new QPanGesture(this);
connect(pan, SIGNAL(triggered()), this, SLOT(onPanTriggered()));
connect(pan, SIGNAL(finished()), this, SLOT(onPanFinished()));
pinch = new QPinchGesture(this);
connect(pinch, SIGNAL(triggered()), this, SLOT(onPinchTriggered()));
connect(pinch, SIGNAL(finished()), this, SLOT(onPinchFinished()));
}
QSize PinchWidget::sizeHint() const
{
return image.size()*1.5;
}
void PinchWidget::paintEvent(QPaintEvent *)
{
QPainter p(this);
QTransform t = worldTransform * currentPanTransform * currentPinchTransform;
p.setTransform(t);
QPoint center = QPoint(width()/2, height()/2);
QPoint size = QPoint(image.width()/2, image.height()/2);
p.translate(center - size);
p.drawImage(QPoint(0,0), image);
}
void PinchWidget::acceptTouchEvents()
{
setAttribute(Qt::WA_AcceptTouchEvents);
if (QWidget *w = qobject_cast<QPushButton*>(sender()))
w->setEnabled(false);
}
void PinchWidget::onPanTriggered()
{
currentPanTransform = QTransform()
.translate(pan->totalOffset().width(),
pan->totalOffset().height());
update();
}
void PinchWidget::onPanFinished()
{
worldTransform *= currentPanTransform;
currentPanTransform.reset();
update();
}
void PinchWidget::onPinchTriggered()
{
QPoint transformCenter = worldTransform.map(QPoint(width()/2, height()/2));
currentPinchTransform = QTransform()
.translate(transformCenter.x(), transformCenter.y())
.scale(pinch->scaleFactor(), pinch->scaleFactor())
.rotateRadians(pinch->rotationAngle())
.translate(-transformCenter.x(), -transformCenter.y());
update();
}
void PinchWidget::onPinchFinished()
{
worldTransform *= currentPinchTransform;
currentPinchTransform.reset();
update();
}
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