chartview.cpp

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#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) {
        m_isTouching = true;
 
        chart()->setAnimationOptions(QChart::NoAnimation);
    }
    return QChartView::viewportEvent(event);
}
 
void ChartView::mousePressEvent(QMouseEvent *event)
{
    if (m_isTouching)
        return;
 
    if (event->button() == Qt::MiddleButton)
    {
        m_lastMousePos = event->pos();
        event->accept();
    }
 
 
 
    QChartView::mousePressEvent(event);
}
 
void ChartView::mouseMoveEvent(QMouseEvent *event)
{
    if (m_isTouching)
        return;
 
    if (event->buttons() == Qt::MiddleButton)
    {
        auto dPos = event->pos() - m_lastMousePos;
        chart()->scroll(-dPos.x(), dPos.y());
 
        m_lastMousePos = event->pos();
        event->accept();
 
    }
 
    QChartView::mouseMoveEvent(event);
}
 
void ChartView::mouseReleaseEvent(QMouseEvent *event)
{
    if (m_isTouching)
        m_isTouching = false;
 
    chart()->setAnimationOptions(QChart::SeriesAnimations);
 
    QChartView::mouseReleaseEvent(event);
}
 
 
void ChartView::keyPressEvent(QKeyEvent *event)
{
    switch (event->key()) {
    case Qt::Key_Plus:
        chart()->zoomIn();
        break;
    case Qt::Key_Minus:
        chart()->zoomOut();
        break;
    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;
    case Qt::Key_Space:
        chart()->zoomReset();
        break;
    default:
        QGraphicsView::keyPressEvent(event);
        break;
    }
}
 
void ChartView::mouseDoubleClickEvent( QMouseEvent * e )
{
    if ( e->button() == Qt::LeftButton )
    {
        chart()->zoomReset();
    }
 
    QGraphicsView::mouseDoubleClickEvent( e );
}