如何在QtCharts中启用鼠标弹出功能？

QT += charts

QChartView *chartView = new QChartView(this);
chartView->setRenderHint(QPainter::Antialiasing);
setCentralWidget(chartView);

QChart *chart = new QChart();
chartView->setChart(chart);

chart->setToolTip("This is a tooltip");

void MyChart::mouseMoveEvent(QMouseEvent *event)
{
    QPointF point = chart->mapToValue(event->pos());
    QString tooltip = QString("X: %1, Y: %2").arg(point.x()).arg(point.y());
    chart->setToolTip(tooltip);
}

setMouseTracking(true);