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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd
** All rights reserved.
** For any questions to The Qt Company, please use contact form at http://qt.io
**
** This file is part of the Qt Charts module.
**
** Licensees holding valid commercial license for Qt may use this file in
** accordance with the Qt License Agreement provided with the Software
** or, alternatively, in accordance with the terms contained in a written
** agreement between you and The Qt Company.
**
** If you have questions regarding the use of this file, please use
** contact form at http://qt.io
**
****************************************************************************/
#include "chart.h"
#include <QtWidgets/QGesture>
#include <QtWidgets/QGraphicsScene>
#include <QtWidgets/QGraphicsView>
Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags)
: QChart(QChart::ChartTypeCartesian, parent, wFlags)
{
// Seems that QGraphicsView (QChartView) does not grab gestures.
// They can only be grabbed here in the QGraphicsWidget (QChart).
grabGesture(Qt::PanGesture);
grabGesture(Qt::PinchGesture);
}
Chart::~Chart()
{
}
//![1]
bool Chart::sceneEvent(QEvent *event)
{
if (event->type() == QEvent::Gesture)
return gestureEvent(static_cast<QGestureEvent *>(event));
return QChart::event(event);
}
bool Chart::gestureEvent(QGestureEvent *event)
{
if (QGesture *gesture = event->gesture(Qt::PanGesture)) {
QPanGesture *pan = static_cast<QPanGesture *>(gesture);
QChart::scroll(-(pan->delta().x()), pan->delta().y());
}
if (QGesture *gesture = event->gesture(Qt::PinchGesture)) {
QPinchGesture *pinch = static_cast<QPinchGesture *>(gesture);
if (pinch->changeFlags() & QPinchGesture::ScaleFactorChanged)
QChart::zoom(pinch->scaleFactor());
}
return true;
}
//![1]
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