bool IBasicPlaybackController.Previous(bool restart)
{
if (CurrentTrack != null && previous_stack.Count > 0)
{
next_stack.Push(current_track);
}
if (previous_stack.Count > 0)
{
CurrentTrack = previous_stack.Pop();
}
else
{
TrackInfo track = CurrentTrack = QueryTrack(Direction.Previous, restart);
if (track != null)
{
CurrentTrack = track;
}
else
{
return(true);
}
}
QueuePlayTrack();
return(true);
}
bool IBasicPlaybackController.Next(bool restart)
{
TrackInfo tmp_track = CurrentTrack;
if (next_stack.Count > 0)
{
CurrentTrack = next_stack.Pop();
if (tmp_track != null)
{
previous_stack.Push(tmp_track);
}
}
else
{
TrackInfo next_track = QueryTrack(Direction.Next, restart);
if (next_track != null)
{
if (tmp_track != null)
{
previous_stack.Push(tmp_track);
}
}
else
{
return(true);
}
CurrentTrack = next_track;
}
QueuePlayTrack();
return(true);
}
private TrackInfo CalcNextTrack(Direction direction, bool restart)
{
if (direction == Direction.Previous)
{
if (previous_stack.Count > 0)
{
return(previous_stack.Pop());
}
}
else if (direction == Direction.Next)
{
if (next_stack.Count > 0)
{
return(next_stack.Pop());
}
}
return(QueryTrack(direction, restart));
}