/// <summary>
/// Finishes pending operations, closes the loaded script, releases resources
/// and resets the runtime context.
/// </summary>
public void CloseScript()
{
if (InternalContext.IsVideoPlaying)
{
_playVideoTaskCancellationContext.SetCloseScript();
}
else
{
CloseScriptCore();
ScriptClosed?.Invoke(this, new EventArgs());
}
}
/// <summary>
/// Starts asynchronous video playback to source and preview Direct3D surfaces beginning at runtime context <see cref="IScriptVideoContext.FrameNumber"/>.
/// </summary>
/// <returns>A <see cref="Task"/> object representing the asynchronous operation.</returns>
public async Task StartVideoPlayback()
{
_playVideoTaskCancellationContext.Reset();
InternalContext.IsVideoPlaying = true;
VideoPlaybackStarted?.Invoke(this, new EventArgs());
IProgress <int> frameChangeProgress = new Progress <int>(OnFrameChanged);
try
{
_ = await Task.Run(() => PlayVideo(frameChangeProgress));
if (!_playVideoTaskCancellationContext.IsCancellationRequested || _playVideoTaskCancellationContext.CancellationReason == PlayVideoTaskCancellationReason.StopRequested)
{
SeekFrame(0);
}
}
catch (Exception ex)
{
// TODO: Is the service method the right place to catch the exception and notify the UI? Could this be handled in the View/ViewModel(s) calling this method?
InternalContext.SystemDialogService.ShowErrorDialog("An exception occurred during video playback", "Script video service", ex);
}
PlayVideoTaskCancellationReason playVideoTaskCancellationReason = _playVideoTaskCancellationContext.CancellationReason;
_playVideoTaskCancellationContext.Reset();
InternalContext.IsVideoPlaying = false;
VideoPlaybackStopped?.Invoke(this, new EventArgs());
if (playVideoTaskCancellationReason == PlayVideoTaskCancellationReason.CloseScriptRequested)
{
CloseScriptCore();
ScriptClosed?.Invoke(this, new EventArgs());
}
}
