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/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd
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** All rights reserved.
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** For any questions to The Qt Company, 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 The Qt Company.
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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 "chartview.h"
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#include <QtGui/QMouseEvent>
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ChartView::ChartView(QChart *chart, QWidget *parent) :
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QChartView(chart, parent),
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m_isTouching(false)
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{
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setRubberBand(QChartView::RectangleRubberBand);
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}
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bool ChartView::viewportEvent(QEvent *event)
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{
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if (event->type() == QEvent::TouchBegin) {
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// By default touch events are converted to mouse events. So
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// after this event we will get a mouse event also but we want
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// to handle touch events as gestures only. So we need this safeguard
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// to block mouse events that are actually generated from touch.
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m_isTouching = true;
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// Turn off animations when handling gestures they
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// will only slow us down.
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chart()->setAnimationOptions(QChart::NoAnimation);
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}
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return QChartView::viewportEvent(event);
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}
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void ChartView::mousePressEvent(QMouseEvent *event)
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{
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if (m_isTouching)
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return;
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QChartView::mousePressEvent(event);
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}
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void ChartView::mouseMoveEvent(QMouseEvent *event)
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{
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if (m_isTouching)
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return;
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QChartView::mouseMoveEvent(event);
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}
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void ChartView::mouseReleaseEvent(QMouseEvent *event)
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{
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if (m_isTouching)
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m_isTouching = false;
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// Because we disabled animations when touch event was detected
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// we must put them back on.
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chart()->setAnimationOptions(QChart::SeriesAnimations);
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QChartView::mouseReleaseEvent(event);
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}
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//![1]
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void ChartView::keyPressEvent(QKeyEvent *event)
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{
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switch (event->key()) {
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case Qt::Key_Plus:
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chart()->zoomIn();
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break;
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case Qt::Key_Minus:
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chart()->zoomOut();
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break;
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//![1]
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case Qt::Key_Left:
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chart()->scroll(-10, 0);
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break;
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case Qt::Key_Right:
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chart()->scroll(10, 0);
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break;
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case Qt::Key_Up:
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chart()->scroll(0, 10);
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break;
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case Qt::Key_Down:
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chart()->scroll(0, -10);
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break;
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default:
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QGraphicsView::keyPressEvent(event);
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break;
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}
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}
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