view.h Example File

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  #ifndef VIEW_H
  #define VIEW_H
  #include <QtWidgets/QGraphicsView>
  #include <QtCharts/QChartGlobal>

  class QGraphicsScene;
  class QMouseEvent;
  class QResizeEvent;

  QT_CHARTS_BEGIN_NAMESPACE
  class QChart;
  QT_CHARTS_END_NAMESPACE

  class Callout;

  QT_CHARTS_USE_NAMESPACE

  class View: public QGraphicsView
  {
      Q_OBJECT

  public:
      View(QWidget *parent = 0);

  protected:
      void resizeEvent(QResizeEvent *event);
      void mouseMoveEvent(QMouseEvent *event);

  public slots:
      void keepCallout();
      void tooltip(QPointF point, bool state);

  private:
      QGraphicsSimpleTextItem *m_coordX;
      QGraphicsSimpleTextItem *m_coordY;
      QChart *m_chart;
      Callout *m_tooltip;
      QList<Callout *> m_callouts;
  };

  #endif