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77 lines
2.9 KiB
77 lines
2.9 KiB
/***************************************************************************
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engineobserver.h - Observer pattern for engine
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-------------------
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begin : Mar 14 2003
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copyright : (C) 2003 by Frederik Holljen
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email : fh@ez.no
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#ifndef AMAROK_ENGINEOBSERVER_H
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#define AMAROK_ENGINEOBSERVER_H
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#include "engine_fwd.h"
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class EngineSubject;
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class MetaBundle;
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class TQString;
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/**
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* if you want to observe the engine, inherit from this class and attach yourself to
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* the engine with attach
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* Note that all positional information and times are in milliseconds
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*/
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class EngineObserver
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{
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public:
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EngineObserver();
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EngineObserver( EngineSubject* );
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virtual ~EngineObserver();
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virtual void engineStateChanged( Engine::State /*state*/, Engine::State /*oldState*/ = Engine::Empty ) {}
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virtual void engineNewMetaData( const MetaBundle &/*bundle*/, bool /*trackChanged*/ ) {}
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virtual void engineTrackEnded( int /*finalPosition*/, int /*trackLength*/, const TQString &/*reason*/ ) {}
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virtual void engineVolumeChanged( int /*percent*/ ) {}
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virtual void engineTrackPositionChanged( long /*position*/ , bool /*userSeek*/ ) {}
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virtual void engineTrackLengthChanged( long /*length*/ ) {}
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private:
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EngineSubject *m_subject;
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};
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#include <tqptrlist.h>
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/**
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* Inherited by EngineController.
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* Notify observer functionality is captured in this class.
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*/
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class EngineSubject
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{
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public:
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void attach( EngineObserver *observer );
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void detach( EngineObserver *observer );
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protected:
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EngineSubject();
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virtual ~EngineSubject();
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void stateChangedNotify( Engine::State /*state*/ );
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void newMetaDataNotify( const MetaBundle &/*bundle*/, bool /*trackChanged*/ );
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void trackEnded( int /*finalPosition*/, int /*trackLength*/, const TQString &reason );
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void volumeChangedNotify( int /*percent*/ );
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/* userSeek means the position didn't change due to normal playback */
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void trackPositionChangedNotify( long /*position*/ , bool userSeek=false );
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void trackLengthChangedNotify( long /*length*/ );
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private:
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TQPtrList<EngineObserver> Observers;
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Engine::State m_oldEngineState;
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};
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#endif // AMAROK_ENGINEOBSERVER_H
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