strawberry-audio-player-windows-mac-linux/src/widgets/volumeslider.h

/***************************************************************************
                       amarokslider.h  -  description
                          -------------------
 begin                : Dec 15 2003
 copyright            : (C) 2003 by Mark Kretschmann
 email                : markey@web.de
 copyright            : (C) 2005 by Gábor Lehel
 email                : illissius@gmail.com
***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef VOLUMESLIDER_H
#define VOLUMESLIDER_H

#include "config.h"

#include <QtGlobal>
#include <QObject>
#include <QWidget>
#include <QList>
#include <QString>
#include <QPixmap>
#include <QColor>
#include <QPalette>
#include <QSlider>

class QTimer;
class QEvent;
class QMouseEvent;
class QPaintEvent;
class QWheelEvent;
class QContextMenuEvent;

class SliderSlider : public QSlider {
  Q_OBJECT

 public:
  explicit SliderSlider(Qt::Orientation, QWidget*, uint max = 0);

  virtual void setValue(int);

  // WARNING non-virtual - and thus only really intended for internal use this is a major flaw in the class presently, however it suits our current needs fine
  int value() const { return adjustValue(QSlider::value()); }

signals:
  // we emit this when the user has specifically changed the slider so connect to it if valueChanged() is too generic Qt also emits valueChanged(int)
  void sliderReleased(int);

 protected:
  virtual void wheelEvent(QWheelEvent*);
  virtual void mouseMoveEvent(QMouseEvent*);
  virtual void mouseReleaseEvent(QMouseEvent*);
  virtual void mousePressEvent(QMouseEvent*);
  virtual void slideEvent(QMouseEvent*);

  bool m_sliding;

  /// we flip the value for vertical sliders
  int adjustValue(int v) const {
    int mp = (minimum() + maximum()) / 2;
    return orientation() == Qt::Vertical ? mp - (v - mp) : v;
  }

 private:
  bool m_outside;
  int m_prevValue;

  SliderSlider(const SliderSlider&);             // undefined
  SliderSlider& operator=(const SliderSlider&);  // undefined
};

class PrettySlider : public SliderSlider {
  Q_OBJECT

 public:
  typedef enum {
    Normal,  // Same behavior as Slider *unless* there's a moodbar
    Pretty
  } SliderMode;

  explicit PrettySlider(Qt::Orientation orientation, SliderMode mode, QWidget* parent, uint max = 0);

 protected:
  virtual void slideEvent(QMouseEvent*);
  virtual void mousePressEvent(QMouseEvent*);

 private:
  PrettySlider(const PrettySlider&);             // undefined
  PrettySlider& operator=(const PrettySlider&);  // undefined

  SliderMode m_mode;
};

class VolumeSlider : public SliderSlider {
  Q_OBJECT

 public:
  explicit VolumeSlider(QWidget *parent, uint max = 0);
  void SetEnabled(const bool enabled);

 protected:
  virtual void paintEvent(QPaintEvent*);
  virtual void enterEvent(QEvent*);
  virtual void leaveEvent(QEvent*);
  virtual void paletteChange(const QPalette&);
  virtual void slideEvent(QMouseEvent*);
  virtual void mousePressEvent(QMouseEvent*);
  virtual void contextMenuEvent(QContextMenuEvent*);
  virtual void wheelEvent(QWheelEvent* e);

 private slots:
  virtual void slotAnimTimer();

 private:
  void generateGradient();
  QPixmap drawVolumePixmap() const;
  void drawVolumeSliderHandle();

  VolumeSlider(const VolumeSlider&);             // undefined
  VolumeSlider& operator=(const VolumeSlider&);  // undefined

  ////////////////////////////////////////////////////////////////
  static const int ANIM_INTERVAL = 18;
  static const int ANIM_MAX = 18;

  bool m_animEnter;
  int m_animCount;
  QTimer* m_animTimer;

  QPixmap m_pixmapInset;
  QPixmap m_pixmapGradient;

  QColor m_previous_theme_text_color;
  QColor m_previous_theme_highlight_color;

  QList<QPixmap> m_handlePixmaps;
};

#endif  // VOLUMESLIDER_H