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Diffstat (limited to 'examples/charts/zoomlinechart/chartview.cpp')
-rw-r--r-- | examples/charts/zoomlinechart/chartview.cpp | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/examples/charts/zoomlinechart/chartview.cpp b/examples/charts/zoomlinechart/chartview.cpp new file mode 100644 index 00000000..64369c62 --- /dev/null +++ b/examples/charts/zoomlinechart/chartview.cpp @@ -0,0 +1,100 @@ +/**************************************************************************** +** +** Copyright (C) 2014 Digia Plc +** All rights reserved. +** For any questions to Digia, please use contact form at http://qt.digia.com +** +** This file is part of the Qt Enterprise Charts Add-on. +** +** $QT_BEGIN_LICENSE$ +** Licensees holding valid Qt Enterprise licenses may use this file in +** accordance with the Qt Enterprise License Agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Digia. +** +** If you have questions regarding the use of this file, please use +** contact form at http://qt.digia.com +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "chartview.h" +#include <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; + } +} |