You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
104 lines
2.9 KiB
104 lines
2.9 KiB
/***************************************************************************
|
|
copyright : (C) 2004 by Scott Wheeler
|
|
email : wheeler@kde.org
|
|
***************************************************************************/
|
|
|
|
/***************************************************************************
|
|
* *
|
|
* 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 PLAYLISTINTERFACE_H
|
|
#define PLAYLISTINTERFACE_H
|
|
|
|
#include "filehandle.h"
|
|
|
|
|
|
class PlaylistObserver;
|
|
|
|
/**
|
|
* An interface implemented by PlaylistInterface to make it possible to watch
|
|
* for changes in the PlaylistInterface. This is a semi-standard observer
|
|
* pattern from i.e. Design Patterns.
|
|
*/
|
|
|
|
class Watched
|
|
{
|
|
public:
|
|
void addObserver(PlaylistObserver *observer);
|
|
void removeObserver(PlaylistObserver *observer);
|
|
|
|
/**
|
|
* This is triggered when the currently playing item has been changed.
|
|
*/
|
|
virtual void currentChanged();
|
|
|
|
/**
|
|
* This is triggered when the data in the playlist -- i.e. the tag content
|
|
* changes.
|
|
*/
|
|
virtual void dataChanged();
|
|
|
|
protected:
|
|
virtual ~Watched();
|
|
|
|
private:
|
|
TQValueList<PlaylistObserver *> m_observers;
|
|
};
|
|
|
|
/**
|
|
* This is a simple interface that should be used by things that implement a
|
|
* playlist-like API.
|
|
*/
|
|
|
|
class PlaylistInterface : public Watched
|
|
{
|
|
public:
|
|
virtual TQString name() const = 0;
|
|
virtual FileHandle currentFile() const = 0;
|
|
virtual int time() const = 0;
|
|
virtual int count() const = 0;
|
|
|
|
virtual void playNext() = 0;
|
|
virtual void playPrevious() = 0;
|
|
virtual void playNextAlbum() = 0;
|
|
virtual void stop() = 0;
|
|
|
|
virtual bool playing() const = 0;
|
|
};
|
|
|
|
class PlaylistObserver
|
|
{
|
|
public:
|
|
virtual ~PlaylistObserver();
|
|
|
|
/**
|
|
* This method must be implemented in concrete implementations; it should
|
|
* define what action should be taken in the observer when the currently
|
|
* playing item changes.
|
|
*/
|
|
virtual void updateCurrent() = 0;
|
|
|
|
/**
|
|
* This method must be implemented in concrete implementations; it should
|
|
* define what action should be taken when the data of the PlaylistItems in
|
|
* the playlist changes.
|
|
*/
|
|
virtual void updateData() = 0;
|
|
|
|
void clearWatched() { m_playlist = 0; }
|
|
|
|
protected:
|
|
PlaylistObserver(PlaylistInterface *playlist);
|
|
const PlaylistInterface *playlist() const;
|
|
|
|
private:
|
|
PlaylistInterface *m_playlist;
|
|
};
|
|
|
|
#endif
|