public MediaBehaviorWithStateCommand(MediaPlaybackCommandManagerCommandBehavior behavior, Func <bool> onExecuteWithNewState, bool initialState)
{
this.behavior = behavior ?? throw new ArgumentNullException(nameof(behavior));
this.onExecuteWithNewState = onExecuteWithNewState ?? throw new ArgumentNullException(nameof(onExecuteWithNewState));
this.behavior.IsEnabledChanged += this.NextBehavior_IsEnabledChanged;
this.IsEnabled = this.behavior.IsEnabled;
}
private async void NextBehavior_IsEnabledChanged(MediaPlaybackCommandManagerCommandBehavior sender, object args)
{
await this.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
this.IsEnabled = this.behavior.IsEnabled;
this.CanExecuteChanged?.Invoke(this, EventArgs.Empty);
this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(this.IsEnabled)));
});
}
public MediaBehaviorCommand(MediaPlaybackCommandManagerCommandBehavior behavior, Action onExecute)
{
this.behavior = behavior ?? throw new ArgumentNullException(nameof(behavior));
this.onExecute = onExecute ?? throw new ArgumentNullException(nameof(onExecute));
this.behavior.IsEnabledChanged += this.NextBehavior_IsEnabledChanged;
}
private void NextBehavior_IsEnabledChanged(MediaPlaybackCommandManagerCommandBehavior sender, object args)
{
Task.Run(() => this.CanExecuteChanged?.Invoke(this, EventArgs.Empty));
}
//<SnippetIsEnabledChanged>
private void NextBehavior_IsEnabledChanged(MediaPlaybackCommandManagerCommandBehavior sender, object args)
{
MyNextButton.IsEnabled = sender.IsEnabled;
}
