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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 "chartview.h"
#include <QtGui/QMouseEvent>
ChartView::ChartView(QChart *chart, QWidget *parent) :
QChartView(chart, parent),
m_isTouching(false)
{
setRubberBand(QChartView::RectangleRubberBand);
}
bool ChartView::viewportEvent(QEvent *event)
{
if (event->type() == QEvent::TouchBegin) {
// By default touch events are converted to mouse events. So
// after this event we will get a mouse event also but we want
// to handle touch events as gestures only. So we need this safeguard
// to block mouse events that are actually generated from touch.
m_isTouching = true;
// Turn off animations when handling gestures they
// will only slow us down.
chart()->setAnimationOptions(QChart::NoAnimation);
}
return QChartView::viewportEvent(event);
}
void ChartView::mousePressEvent(QMouseEvent *event)
{
if (m_isTouching)
return;
QChartView::mousePressEvent(event);
}
void ChartView::mouseMoveEvent(QMouseEvent *event)
{
if (m_isTouching)
return;
QChartView::mouseMoveEvent(event);
}
void ChartView::mouseReleaseEvent(QMouseEvent *event)
{
if (m_isTouching)
m_isTouching = false;
// Because we disabled animations when touch event was detected
// we must put them back on.
chart()->setAnimationOptions(QChart::SeriesAnimations);
QChartView::mouseReleaseEvent(event);
}
//![1]
void ChartView::keyPressEvent(QKeyEvent *event)
{
switch (event->key()) {
case Qt::Key_Plus:
chart()->zoomIn();
break;
case Qt::Key_Minus:
chart()->zoomOut();
break;
//![1]
case Qt::Key_Left:
chart()->scroll(-10, 0);
break;
case Qt::Key_Right:
chart()->scroll(10, 0);
break;
case Qt::Key_Up:
chart()->scroll(0, 10);
break;
case Qt::Key_Down:
chart()->scroll(0, -10);
break;
default:
QGraphicsView::keyPressEvent(event);
break;
}
}
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