/*
  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.
*/

/*
  osd.h   -  Provides an interface to a plain QWidget, which is independent of KDE (bypassed to X11)
  begin:     Fre Sep 26 2003
  copyright: (C) 2003 by Christian Muehlhaeuser
  email:     chris@chris.de
*/

#ifndef AMAROK_OSD_H
#define AMAROK_OSD_H

#include <kpixmap.h>
#include <qimage.h>
#include <qvaluelist.h>
#include <qwidget.h> //baseclass


class OSDWidget : public QWidget
{
    Q_OBJECT

    public:
        enum Alignment { Left, Middle, Center, Right };

        OSDWidget( QWidget *parent, const char *name = "osd" );

        /** resets the colours to defaults */
        void unsetColors();

      public slots:
        /** calls setText() then show(), after setting image if needed */
        void show( const QString &text, QImage newImage = QImage::QImage() );

        /** reimplemented, shows the OSD */
        virtual void show();

        /**
         * For the sake of somplicity, when these settings are
         * changed they do not take effect until the next time
         * the OSD is shown!
         *
         * To force an update call show();
         */
        void setDuration( int ms ) { m_duration = ms; }
        void setTextColor( const QColor &color ) { setPaletteForegroundColor( color ); }
        void setBackgroundColor(const QColor &color ) { setPaletteBackgroundColor( color ); }
        void setOffset( int y ) { m_y = y; }
        void setAlignment( Alignment alignment ) { m_alignment = alignment; }
        void setImage( const QImage &image ) { m_cover = image; }
        void setScreen( int screen );
        void setText( const QString &text ) { m_text = text; }
        void setDrawShadow( bool b ) { m_drawShadow = b; }
        void setTranslucency( bool b ) { m_translucency = b; }

    protected:
        /** determine new size and position */
        QRect determineMetrics( const uint marginMetric );

        /** render OSD */
        void render( const uint marginMetric, const QSize &size );

        /** reimplemented */
        virtual void mousePressEvent( QMouseEvent* );
        virtual bool event( QEvent* );

        /** distance from screen edge */
        static const int MARGIN = 15;

        int         m_duration;
        QTimer     *m_timer;
        Alignment   m_alignment;
        int         m_screen;
        uint        m_y;
        bool        m_drawShadow;
        bool        m_translucency;
        QString     m_text;
        QImage      m_cover;
        QPixmap     m_scaledCover;
        KPixmap     m_screenshot;
        QPixmap     m_buffer;
};



class OSDPreviewWidget : public OSDWidget
{
    Q_OBJECT

public:
    OSDPreviewWidget( QWidget *parent );

    int screen()    { return m_screen; }
    int alignment() { return m_alignment; }
    int y()         { return m_y; }

public slots:
    void setTextColor( const QColor &color ) { OSDWidget::setTextColor( color ); doUpdate(); }
    void setBackgroundColor(const QColor &color ) { OSDWidget::setBackgroundColor( color ); doUpdate(); }
    void setDrawShadow( bool b ) { OSDWidget::setDrawShadow( b ); doUpdate(); }
    void setFont( const QFont &font ) { OSDWidget::setFont( font ); doUpdate(); }
    void setScreen( int screen ) { OSDWidget::setScreen( screen ); doUpdate(); }

private:
    inline void doUpdate() { if( isShown() ) show(); }

signals:
    void positionChanged();

protected:
    void mousePressEvent( QMouseEvent * );
    void mouseReleaseEvent( QMouseEvent * );
    void mouseMoveEvent( QMouseEvent * );

private:
    bool   m_dragging;
    QPoint m_dragOffset;
};



class MetaBundle;

namespace amaroK
{
    class OSD : public OSDWidget
    {
        Q_OBJECT

    public:
        static OSD *instance()
        {
            static OSD *s_instance = new OSD;
            return s_instance;
        }

        void applySettings();
        void show( const MetaBundle &bundle );

    public slots:
        /**
         * When user pushs global shortcut or uses DCOP OSD is toggle
         * even if it is disabled()
         */
        void forceToggleOSD();

    private:
        OSD() : OSDWidget( 0 ) {}
    };
}

#endif /*AMAROK_OSD_H*/
