/// <summary>
/// Constructs an event handler for <see cref="IAudioPlayer.TimeChanged"/>.
/// </summary>
/// <param name="action">The action.</param>
private static void AddTimeChangedHandler(this IPlayAudioAction action)
{
async void handler(object obj, PlaybackTimeEventArgs e)
{
string title = null;
if (e.Current != TimeSpan.Zero)
{
var remaining = e.Total.Subtract(e.Current);
title = remaining.TotalSeconds > 0.1f ? remaining.ToString("mm':'ss") : null;
}
try
{
await action.SetTitleAsync(title, TargetType.Both);
}
catch (ObjectDisposedException)
{
// Safely handle the audio player changing.
var audioPlayer = action?.PlaylistController?.AudioPlayer;
if (audioPlayer != null)
{
audioPlayer.TimeChanged -= handler;
}
}
}
action.PlaylistController.AudioPlayer.Disposed += (_, __) => action.PlaylistController.AudioPlayer.TimeChanged -= handler;
action.PlaylistController.AudioPlayer.TimeChanged += handler;
}
/// <summary>
/// Sets the <see cref="IPlaylistController"/> for this instance.
/// </summary>
/// <param name="action">This instance.</param>
/// <param name="settings">The settings.</param>
public static void SetPlaylistController(this IPlayAudioAction action, IPlayAudioSettings settings)
{
// Ensure we have a playlist controller, and that the device is correct.
if (action.PlaylistController == null ||
action.PlaylistController.Action != settings.Action)
{
// Ensure we keep the playlist before disposing.
var playlist = action?.PlaylistController?.Playlist ?? new AudioFileCollection();
action.PlaylistController?.Dispose();
// Create the new controller, and assign its playlist
action.PlaylistController = action.AudioService.GetPlaylistController(settings.PlaybackAudioDeviceId, settings.Action);
action.PlaylistController.Playlist = playlist;
action.AddTimeChangedHandler();
}
else
{
action.PlaylistController.AudioPlayer.Device = AudioDevices.Current.GetDeviceByKey(settings.PlaybackAudioDeviceId);
}
action.PlaylistController.Order = settings.Order;
}