qt-everywhere-src-5.14.1/qtcharts/examples/charts/chartinteractions/chartview.cpp

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#include "chartview.h"
#include <QtGui/QMouseEvent>
#include "chart.h"

ChartView::ChartView(Chart *chart, QWidget *parent) :
    QChartView(chart, parent)
{
    m_chart = chart;
}

void ChartView::mousePressEvent(QMouseEvent *event)
{
    m_mousePos = event->pos();
    QChartView::mousePressEvent(event);
}

void ChartView::mouseMoveEvent(QMouseEvent *event)
{
    m_chart->handlePointMove(event->pos());
    QChartView::mouseMoveEvent(event);
}

void ChartView::mouseReleaseEvent(QMouseEvent *event)
{
    if (event->pos() != m_mousePos) {
        m_chart->handlePointMove(event->pos());
        m_chart->setPointClicked(false);
    }
    QChartView::mouseReleaseEvent(event);
}