/// <summary>
/// Start playing, from the start of the track, if: (1) there is a queued track to play and (2) the player is in the hard-stopped state at the moment
/// </summary>
public void StartPlayingIfAppropriate()
{
if (this.PlayQueue.Count == 0 || !ToccataModel.MediaPlayerHasNoSource())
{
return;
}
ToccataModel.Play(this.PlayQueue[0].storage); // start playing the track that is at the top of the queue.
}
/// <summary>
/// Starts or restarts playback.
/// </summary>
public void Play()
{
if (ToccataModel.MediaPlayerHasNoSource()) // if the player has been hard-stopeed, then ...
{
if (this.PlayQueue.Count <= 0)
{
return;
}
ToccataModel.Play(this.PlayQueue[0].storage); // ... play the top track on the queue
}
else
{
ToccataModel.Play(); // ... else play whatever is currently assigned as the player's source.
}
}
//private DispatcherTimer _dtimer = null;
private async void ThrottledPlaybackStateChanged(MediaPlayer player)
{
if (_playbackStateChangePending)
{
// A change has already been noted, and the 'state changed' handler will get called anyway some time within the next 100ms
return;
}
else
{
_playbackStateChangePending = true;
await Task.Delay(100); // allow 100ms for subsequent state changes to come in
_playbackStateChangePending = false;
//
// Now adjust the appearance of the Pause/Play button as needed, and kick off playback of the next track in the queue, if there is one.
//
if (player.PlaybackSession == null) // error - never started
{
}
else if (player.PlaybackSession.PlaybackState == MediaPlaybackState.Paused)
{
bool trackFinished = false; //at the end of a track?
if (player.PlaybackSession.Position != TimeSpan.Zero && player.PlaybackSession.Position.Add(TimeSpan.FromSeconds(1)) >= player.PlaybackSession.NaturalDuration)
{
// Position is not at the start of the media, and is equal/near to the duration of the player's media,
// This means we are at the end of a track
trackFinished = true;
}
MainPage.SetPlayButtonAppearance(false); // Set the Play button to display a "play" label, and do 'play' when tapped.
if (trackFinished) // paused, and at the end of a track
{
MainPage.SetNowPlaying(""); // "***FINISHED: " + player.PlaybackSession.PlaybackState.ToString() + " " + player.PlaybackSession.Position.TotalSeconds.ToString() + "/" + player.PlaybackSession.NaturalDuration.TotalSeconds.ToString()); // set the text label at the bottom of the slider to blank.
if (PlayQueue.Count > 0) // (this is just defensive coding, it should always be true)
{
PlayQueue.RemoveAt(0); // We've finished this track, so remove it from the top of the play queue.
}
if (PlayQueue.Count > 0) // if there is now a track at the top of the queue ...
{
ToccataModel.Play(this.PlayQueue[0].storage); // ... start playing it.
}
else
{
ToccataModel.Stop(); // ... otherwise, we should hard-stop the player, leaving it ready to play something, when something is queued up.
}
}
else // paused but not finished the track - e.g. because the user tapped the Pause button.
{
// MainPage.SetNowPlaying("***PAUSED: " + player.PlaybackSession.PlaybackState.ToString()+" "+ player.PlaybackSession.Position.TotalSeconds.ToString()+"/"+ player.PlaybackSession.NaturalDuration.TotalSeconds.ToString());
}
}
else // playing, buffering, opening, none, or whatever
{
if (player.PlaybackSession.PlaybackState == MediaPlaybackState.Playing)
{
MainPage.SetPlayButtonAppearance(true); // Set the Play button to display a "pause" label, and do 'pause' when tapped.
}
else // could be 'buffering', 'opening' or 'none' - anyhow, it's a state in which the media is not (yet) playing.
{
MainPage.SetPlayButtonAppearance(false); // Set the Play button to display a "play" label, and do 'play' when tapped.
}
if (PlayQueue.Count > 0) // (this is just defensive coding, it should always be true)
{
MainPage.SetNowPlaying(PlayQueue[0].DisplayName + " (" + PlayQueue[0].storage.Path + ")");
}
}
}
}