chartview.cpp
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CppLexer
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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 "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; | ||||
} | ||||
} | ||||