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/***************************************************************************
engineobserver.cpp - Observer pattern for engine
-------------------
begin : Mar 14 2003
copyright : (C) 2003 by Frederik Holljen
email : fh@ez.no
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#include "debug.h"
#include "collectiondb.h"
#include "engineobserver.h"
#include "metabundle.h"
#include "podcastbundle.h"
#include <tqptrlist.h>
//////////////////////////////////////////////////////////////////////////////////////////
/// CLASS EngineObserver
//////////////////////////////////////////////////////////////////////////////////////////
EngineObserver::EngineObserver()
: m_subject( 0 )
{}
EngineObserver::EngineObserver( EngineSubject *s )
: m_subject( s )
{
m_subject->attach( this );
}
EngineObserver::~EngineObserver()
{
if ( m_subject )
m_subject->detach( this );
}
//////////////////////////////////////////////////////////////////////////////////////////
/// CLASS EngineSubject
//////////////////////////////////////////////////////////////////////////////////////////
EngineSubject::EngineSubject()
: m_oldEngineState( Engine::Empty )
{}
EngineSubject::~EngineSubject()
{}
void EngineSubject::stateChangedNotify( Engine::State state )
{
DEBUG_BLOCK
TQPtrListIterator<EngineObserver> it( Observers );
EngineObserver *observer;
while( ( observer = it.current() ) != 0 )
{
++it;
observer->engineStateChanged( state, m_oldEngineState );
}
m_oldEngineState = state;
}
void EngineSubject::newMetaDataNotify( const MetaBundle &bundle, bool trackChanged )
{
DEBUG_BLOCK
TQPtrListIterator<EngineObserver> it( Observers );
EngineObserver *observer;
PodcastEpisodeBundle peb;
MetaBundle b( bundle );
if( CollectionDB::instance()->getPodcastEpisodeBundle( bundle.url(), &peb ) )
{
b.setPodcastBundle( peb );
}
while( ( observer = it.current() ) != 0 )
{
++it;
observer->engineNewMetaData( b, trackChanged );
}
}
void EngineSubject::trackEnded( int finalPosition, int trackLength, const TQString &reason )
{
for( TQPtrListIterator<EngineObserver> it( Observers ); *it; ++it )
(*it)->engineTrackEnded( finalPosition, trackLength, reason );
}
void EngineSubject::volumeChangedNotify( int percent )
{
TQPtrListIterator<EngineObserver> it( Observers );
EngineObserver *observer;
while( ( observer = it.current() ) != 0 )
{
++it;
observer->engineVolumeChanged( percent );
}
}
void EngineSubject::trackPositionChangedNotify( long position, bool userSeek )
{
TQPtrListIterator<EngineObserver> it( Observers );
EngineObserver *observer;
while( ( observer = it.current() ) != 0 )
{
++it;
observer->engineTrackPositionChanged( position, userSeek );
}
}
void EngineSubject::trackLengthChangedNotify( long length )
{
TQPtrListIterator<EngineObserver> it( Observers );
EngineObserver *observer;
while( ( observer = it.current() ) != 0 )
{
++it;
observer->engineTrackLengthChanged( length );
}
}
void EngineSubject::attach( EngineObserver *observer )
{
if( !observer || Observers.find( observer ) != -1 )
return;
Observers.append( observer );
}
void EngineSubject::detach( EngineObserver *observer )
{
if( Observers.find( observer ) != -1 ) Observers.remove();
}
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