Qt 5.7 | Qt Charts | Callout Example | callout.h Example File

Qt 5.7.1 Reference Documentation

# callout.h Example File

callout/callout.h

      /****************************************************************************
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      ** Copyright (C) 2016 The Qt Company Ltd.
      ** Contact: https://www.qt.io/licensing/
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      ** This file is part of the Qt Charts module of the Qt Toolkit.
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      ** $QT_BEGIN_LICENSE:GPL$
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      #ifndef CALLOUT_H
      #define CALLOUT_H

      #include <QtCharts/QChartGlobal>
      #include <QtWidgets/QGraphicsItem>
      #include <QtGui/QFont>

      class QGraphicsSceneMouseEvent;

      QT_CHARTS_BEGIN_NAMESPACE
      class QChart;
      QT_CHARTS_END_NAMESPACE

      QT_CHARTS_USE_NAMESPACE

      class Callout : public QGraphicsItem
      {
      public:
          Callout(QChart *parent);

          void setText(const QString &text);
          void setAnchor(QPointF point);
          void updateGeometry();

          QRectF boundingRect() const;
          void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,QWidget *widget);

      protected:
          void mousePressEvent(QGraphicsSceneMouseEvent *event);
          void mouseMoveEvent(QGraphicsSceneMouseEvent *event);

      private:
          QString m_text;
          QRectF m_textRect;
          QRectF m_rect;
          QPointF m_anchor;
          QFont m_font;
          QChart *m_chart;
      };

      #endif // CALLOUT_H