/// <summary>
/// Stops the property updates worker. You will need to call this method when the platform-specific
/// implementation of the control is disposed or removed.
/// </summary>
private void StopPropertyUpdatesWorker()
{
lock (PropertyUpdatesLock)
{
PropertyUpdatesWorker?.Stop();
PropertyUpdatesWorker = null;
}
}
/// <summary>
/// Stops the property updates worker. You will need to call this method when the platform-specific
/// implementation of the control is disposed or removed.
/// </summary>
private void StopPropertyUpdatesWorker()
{
lock (PropertyUpdatesLock)
{
PropertyUpdatesWorker?.Stop();
PropertyUpdatesWorker = null;
}
// Ensure one last update
UpdateStateProperties();
}
public ObservableQuery(IDataService db)
{
_db = db;
H <ObservableQuery <T> > .Initialize(this);
_timer = NotifyHelper.EventHandlerService.GetTimer();
_timer.Tick += async(a, b) => await _timer_TickAsync(a, b);
_timer.Interval = TimeSpan.FromMilliseconds(300);
Suspender = new Suspender(() => _timer.Stop(), () => _timer.Start());
_token = Suspender.Get();
}
/// <summary>
/// Starts the property updates worker. You will need to call this method in the constructor of
/// the platform-specific MediaElement implementation to continuously pull values from the media state.
/// </summary>
/// <exception cref="KeyNotFoundException">MediaElement does not have minimum set of MediaProperties.</exception>
private void StartPropertyUpdatesWorker()
{
lock (PropertyUpdatesLock)
{
// Check that we are not already started
if (PropertyUpdatesWorker != null)
{
return;
}
// Check that all properties map back to the media state
if (PropertyMapper.MissingPropertyMappings.Count > 0)
{
throw new KeyNotFoundException($"{nameof(MediaElement)} is missing properties exposed by {nameof(IMediaEngineState)}. " +
$"Missing properties are: {string.Join(", ", PropertyMapper.MissingPropertyMappings)}. " +
$"Please add these properties to the {nameof(MediaElement)} class.");
}
// Properties Worker Logic
PropertyUpdatesWorker = Library.GuiContext.CreateTimer(Constants.PropertyUpdatesInterval, UpdateStateProperties);
}
}
