在一个按钮上协调多个IObservable

Question

我有一个在播放/暂停之间交替的按钮.我想看看是否有一个使用反应式扩展的好解决方案,而不是翻转布尔值.这是对我的想法的粗略估计.

var whenPlayClicked = Observable.FromEventPattern<EventArgs>(_playPauseButton, "Click")
    .Take(1)
    .Skip(1)
    .Repeat();

var whenPauseclicked = Observable.FromEventPattern<EventArgs>(_playPauseButton, "Click")
    .Skip(1)
    .Take(1)
    .Repeat();

Answer 1

Rx不提供任何本机运算符来简单地切换布尔值; 但是,您可以编写一个非常优雅的Scan查询来避免闭包.

void UserControl_Loaded(object sender, RoutedEventArgs e)
{
  Observable.FromEventPattern(_playPauseButton, "Click")
            .Scan(false, (play, _) => !play)
            .Subscribe(play => { if (play) Play(); else Pause(); });
}

private void Play()
{
  _playPauseButton.Content = "Pause";
}

private void Pause()
{
  _playPauseButton.Content = "Play";
}