chart.cpp
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| 2.5 KiB
| text/x-c
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CppLexer
winter
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r0 | /**************************************************************************** | ||
** | ||||
** 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] | ||||