public PropertyChangeNotifier(DependencyObject propertySource, PropertyPath property)
{
propertySource.CheckNotNull(nameof(propertySource));
property.CheckNotNull(nameof(property));
_propertySource = new WeakReference(propertySource);
var binding = new Binding
{
Path = property,
Mode = BindingMode.OneWay,
Source = propertySource
};
BindingOperations.SetBinding(this, ValueProperty, binding);
}
protected static void OnContentChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var p = (MediaPlayerBase)d.CheckNotNull(nameof(d));
if (e.OldValue is PlayerHostBase oldValue)
{
oldValue.MediaLoaded -= p.Player_MediaLoaded;
oldValue.MediaUnloaded -= p.Player_MediaUnloaded;
p._positionChangedNotifier !.ValueChanged -= p.Player_PositionChanged;
p._positionChangedNotifier = null;
}
if (e.NewValue is PlayerHostBase newValue)
{
newValue.MediaLoaded += p.Player_MediaLoaded;
newValue.MediaUnloaded += p.Player_MediaUnloaded;
p._positionChangedNotifier = new PropertyChangeNotifier(newValue, "Position");
p._positionChangedNotifier.ValueChanged += p.Player_PositionChanged;
}
p.OnContentChanged(e);
}
private static void OnPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var notifier = (PropertyChangeNotifier)d.CheckNotNull(nameof(d));
notifier.ValueChanged?.Invoke(notifier.PropertySource, EventArgs.Empty);
}
