Qt 5.8 | Qt Charts | Callout Example | callout.h Example File

Qt 5.8.0 Reference Documentation

# callout.h Example File

callout/callout.h

      /****************************************************************************
      **
      ** Copyright (C) 2016 The Qt Company Ltd.
      ** Contact: https://www.qt.io/licensing/
      **
      ** This file is part of the Qt Charts module of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:GPL$
      ** Commercial License Usage
      ** Licensees holding valid commercial Qt licenses may use this file in
      ** accordance with the commercial license agreement provided with the
      ** Software or, alternatively, in accordance with the terms contained in
      ** a written agreement between you and The Qt Company. For licensing terms
      ** and conditions see https://www.qt.io/terms-conditions. For further
      ** information use the contact form at https://www.qt.io/contact-us.
      **
      ** GNU General Public License Usage
      ** Alternatively, this file may be used under the terms of the GNU
      ** General Public License version 3 or (at your option) any later version
      ** approved by the KDE Free Qt Foundation. The licenses are as published by
      ** the Free Software Foundation and appearing in the file LICENSE.GPL3
      ** included in the packaging of this file. Please review the following
      ** information to ensure the GNU General Public License requirements will
      ** be met: https://www.gnu.org/licenses/gpl-3.0.html.
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      #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