/// <summary>
/// Sends message to background informing app has resumed
/// Subscribe to MediaPlayer events
/// </summary>
void ForegroundApp_Resuming(object sender, object e)
{
ApplicationSettingsHelper.SaveSettingsValue(ApplicationSettingsConstants.AppState, AppState.Active.ToString());
// Verify the task is running
if (IsMyBackgroundTaskRunning)
{
// If yes, it's safe to reconnect to media play handlers
AddMediaPlayerEventHandlers();
// Send message to background task that app is resumed so it can start sending notifications again
MessageService.SendMessageToBackground(new AppResumedMessage());
UpdateTransportControls(CurrentPlayer.CurrentState);
int trackId = GetCurrentTrackIdAfterAppResume();
CurrentTrack = trackId == 0 ? null : TrackQueue.Single(s => s.InternalID == trackId);
}
else
{
StopButtonVisibility = Visibility.Collapsed;
PlayButtonVisibility = Visibility.Visible;
PlayButtonIsEnabled = true;
}
RefreshBindings();
}
/// <summary>
/// This event is raised when a message is recieved from BackgroundAudioTask
/// </summary>
async void BackgroundMediaPlayer_MessageReceivedFromBackground(object sender, MediaPlayerDataReceivedEventArgs e)
{
TrackChangedMessage trackChangedMessage;
if (MessageService.TryParseMessage(e.Data, out trackChangedMessage))
{
// When foreground app is active change track based on background message
await Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
// If playback stopped then clear the UI
if (trackChangedMessage.InternalMixID == 0)
{
Stop();
RefreshBindings();
return;
}
CurrentTrack = TrackQueue.Single(s => s.InternalID == trackChangedMessage.InternalMixID);
// Ensure track buttons are re-enabled since they are disabled when pressed
foreach (Mix m in TrackQueue.Where(m => m.Playing))
{
m.Playing = false;
}
CurrentTrack.Playing = true;
NextButtonIsEnabled = true;
PreviousButtonIsEnabled = true;
RefreshBindings();
});
return;
}
BackgroundAudioTaskStartedMessage backgroundAudioTaskStartedMessage;
if (MessageService.TryParseMessage(e.Data, out backgroundAudioTaskStartedMessage))
{
// StartBackgroundAudioTask is waiting for this signal to know when the task is up and running
// and ready to receive messages
Debug.WriteLine("BackgroundAudioTask started");
return;
}
UpdateMediaPlayerInfoMessage updateMediaPlayerInfoMessage;
if (MessageService.TryParseMessage(e.Data, out updateMediaPlayerInfoMessage))
{
// StartBackgroundAudioTask is waiting for this signal to know when the task is up and running
// and ready to receive messages
// When foreground app is active change track based on background message
await Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, async() =>
{
if (MainpageViewModel.instance.GetMixesTask != null && MainpageViewModel.instance.GetMixesTask.IsCompleted == false)
{
await MainpageViewModel.instance.GetMixesTask;
}
if (updateMediaPlayerInfoMessage.InternalMixID != 0)
{
if (TrackQueue == null)
{
TrackQueue = MainpageViewModel.instance.Mixes;
}
Mix PlayingTrack = CurrentTrack;
CurrentTrack = TrackQueue.Where(s => s.InternalID == updateMediaPlayerInfoMessage.InternalMixID).FirstOrDefault();
if (CurrentTrack == null)
{
CurrentTrack = PlayingTrack;
}
// Ensure track buttons are re-enabled since they are disabled when pressed
foreach (Mix m in TrackQueue.Where(m => m.Playing))
{
if (m != CurrentTrack)
{
m.Playing = false;
}
}
if (CurrentTrack != null)
{
CurrentTrack.Playing = true;
NextButtonIsEnabled = true;
PreviousButtonIsEnabled = true;
RefreshBindings();
}
}
});
Debug.WriteLine("Updating MediaInfo");
return;
}
}
