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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Charts module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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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