customformatter.h Example File

  /****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the Qt Data Visualization 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 CUSTOMFORMATTER_H
  #define CUSTOMFORMATTER_H

  #include <QtDataVisualization/QValue3DAxisFormatter>
  #include <QtCore/QDateTime>
  #include <QtCore/QVector>

  using namespace QtDataVisualization;

  class CustomFormatter : public QValue3DAxisFormatter
  {
      Q_OBJECT

      Q_PROPERTY(QDate originDate READ originDate WRITE setOriginDate NOTIFY originDateChanged)
      Q_PROPERTY(QString selectionFormat READ selectionFormat WRITE setSelectionFormat NOTIFY selectionFormatChanged)
  public:
      explicit CustomFormatter(QObject *parent = 0);
      virtual ~CustomFormatter();

      virtual QValue3DAxisFormatter *createNewInstance() const;
      virtual void populateCopy(QValue3DAxisFormatter &copy) const;
      virtual void recalculate();
      virtual QString stringForValue(qreal value, const QString &format) const;

      QDate originDate() const;
      QString selectionFormat() const;

  public Q_SLOTS:
      void setOriginDate(const QDate &date);
      void setSelectionFormat(const QString &format);

  Q_SIGNALS:
      void originDateChanged(const QDate &date);
      void selectionFormatChanged(const QString &format);

  private:
      Q_DISABLE_COPY(CustomFormatter)

      QDateTime valueToDateTime(qreal value) const;

      QDate m_originDate;
      QString m_selectionFormat;
  };

  #endif