mainwidget.h Example File

  /****************************************************************************
  **
  ** 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 MAINWIDGET_H
  #define MAINWIDGET_H

  #include <QtCharts/QChartGlobal>
  #include <QtCharts/QChart>
  #include <QtCharts/QChartView>
  #include <QtWidgets/QWidget>
  #include <QtWidgets/QGraphicsWidget>
  #include <QtWidgets/QGridLayout>
  #include <QtWidgets/QGraphicsGridLayout>
  #include <QtWidgets/QDoubleSpinBox>
  #include <QtWidgets/QGroupBox>
  #include <QtCharts/QBarSeries>

  QT_CHARTS_USE_NAMESPACE

  class MainWidget : public QWidget
  {
      Q_OBJECT
  public:
      explicit MainWidget(QWidget *parent = 0);
      void createSeries();
      void showLegendSpinbox();
      void hideLegendSpinbox();

  public Q_SLOTS:
      void toggleAttached();
      void addBarset();
      void removeBarset();

      void setLegendAlignment();

      void toggleBold();
      void toggleItalic();
      void fontSizeChanged();

      void updateLegendLayout();

  private:
      QChart *m_chart;
      QBarSeries *m_series;

      QChartView *m_chartView;
      QGridLayout *m_mainLayout;
      QGridLayout *m_buttonLayout;
      QGridLayout *m_fontLayout;

      QDoubleSpinBox *m_fontSize;

      // For detached layout
      QGroupBox *m_legendSettings;
      QDoubleSpinBox *m_legendPosX;
      QDoubleSpinBox *m_legendPosY;
      QDoubleSpinBox *m_legendWidth;
      QDoubleSpinBox *m_legendHeight;
  };

  #endif // MAINWIDGET_H