text: /****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of Qt Creator.
  **
  ** 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 as published by the Free Software
  ** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
  ** 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.
  **
  ****************************************************************************/
  
  #pragma once
  
  #include "utils_global.h"
  
  #include <QAbstractButton>
  
  QT_FORWARD_DECLARE_CLASS(QGraphicsOpacityEffect)
  
  namespace Utils {
  class QTCREATOR_UTILS_EXPORT FadingPanel : public QWidget
  {
      Q_OBJECT
  
  public:
      FadingPanel(QWidget *parent = 0)
          : QWidget(parent)
      {}
      virtual void fadeTo(qreal value) = 0;
      virtual void setOpacity(qreal value) = 0;
  };
  
  class QTCREATOR_UTILS_EXPORT FadingWidget : public FadingPanel
  {
      Q_OBJECT
  public:
      FadingWidget(QWidget *parent = 0);
      void fadeTo(qreal value);
      qreal opacity();
      void setOpacity(qreal value);
  protected:
      QGraphicsOpacityEffect *m_opacityEffect;
  };
  
  class QTCREATOR_UTILS_EXPORT DetailsButton : public QAbstractButton
  {
      Q_OBJECT
      Q_PROPERTY(float fader READ fader WRITE setFader)
  
  public:
      DetailsButton(QWidget *parent = 0);
  
      QSize sizeHint() const;
      float fader() { return m_fader; }
      void setFader(float value) { m_fader = value; update(); }
  
  protected:
      void paintEvent(QPaintEvent *e);
      bool event(QEvent *e);
  
  private:
      QPixmap cacheRendering(const QSize &size, bool checked);
      QPixmap m_checkedPixmap;
      QPixmap m_uncheckedPixmap;
      float m_fader;
  };
  } // namespace Utils
  