| /**************************************************************************** |
| ** |
| ** 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; |
| } |
| } |