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/****************************************************************************
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**
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** Copyright (C) 2014 Digia Plc
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** All rights reserved.
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** For any questions to Digia, please use contact form at http://qt.io
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**
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** This file is part of the Qt Charts module.
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**
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** Licensees holding valid commercial license for Qt may use this file in
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** accordance with the Qt License Agreement provided with the Software
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** or, alternatively, in accordance with the terms contained in a written
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** agreement between you and Digia.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.io
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**
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****************************************************************************/
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#include "chart.h"
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#include <QtWidgets/QGesture>
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#include <QtWidgets/QGraphicsScene>
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#include <QtWidgets/QGraphicsView>
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Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags)
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: QChart(QChart::ChartTypeCartesian, parent, wFlags)
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{
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// Seems that QGraphicsView (QChartView) does not grab gestures.
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// They can only be grabbed here in the QGraphicsWidget (QChart).
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grabGesture(Qt::PanGesture);
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grabGesture(Qt::PinchGesture);
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}
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Chart::~Chart()
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{
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}
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//![1]
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bool Chart::sceneEvent(QEvent *event)
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{
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if (event->type() == QEvent::Gesture)
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return gestureEvent(static_cast<QGestureEvent *>(event));
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return QChart::event(event);
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}
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bool Chart::gestureEvent(QGestureEvent *event)
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{
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if (QGesture *gesture = event->gesture(Qt::PanGesture)) {
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QPanGesture *pan = static_cast<QPanGesture *>(gesture);
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QChart::scroll(-(pan->delta().x()), pan->delta().y());
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}
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if (QGesture *gesture = event->gesture(Qt::PinchGesture)) {
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QPinchGesture *pinch = static_cast<QPinchGesture *>(gesture);
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if (pinch->changeFlags() & QPinchGesture::ScaleFactorChanged)
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QChart::zoom(pinch->scaleFactor());
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}
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return true;
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}
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//![1]
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