| /**************************************************************************** |
| ** |
| ** 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 |
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| ** |
| ** 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 |
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| ****************************************************************************/ |
| |
| #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] |