Question

我正在尝试创建在打开/关闭时具有动画效果的窗口。到目前为止，我已经成功并在 SO 社区的帮助下提出了使用附加行为的解决方案像这样为我的窗口设置动画：

public class NotificationWindowBehavior : Behavior<Window>
{
//Here I define some properties, which I have omitted for simplicity
  
    protected override void OnAttached()
    {
        base.OnAttached();
        this.AssociatedObject.Loaded += this.OnLoaded;
        this.AssociatedObject.Closing += this.OnClosing;
    }

    protected override void OnDetaching()
    {
        base.OnDetaching();
        this.AssociatedObject.Loaded -= this.OnLoaded;
        this.AssociatedObject.Closing -= this.OnClosing;
    }

    private void OnLoaded(object sender, System.Windows.RoutedEventArgs e)
    {
        FadeInAnimation.Begin(AssociatedObject);

    }
    private void OnClosing(object sender, CancelEventArgs e)
    {
        e.Cancel = true;

        FadeOutAnimation.Completed += eventHandler;
        FadeOutAnimation.Begin(AssociatedObject);

        void eventHandler(object s, EventArgs er)
        {
            FadeOutAnimation.Completed -= eventHandler;
            this.AssociatedObject.Hide();
        }
    }
}

在 xaml 中：

  <Window.Resources>              
    <Storyboard x:Key="FadeInAnimation">
        <DoubleAnimation
            Storyboard.Target="{Binding ElementName=Window}"
            Storyboard.TargetProperty="(Window.Opacity)"
            Duration="0:0:0.3" From="0" To="1">
        </DoubleAnimation>
    </Storyboard>

    <Storyboard x:Key="FadeOutAnimation">
        <DoubleAnimation
            Storyboard.Target="{Binding ElementName=Window}"
            Storyboard.TargetProperty="(Window.Opacity)"
            Duration="0:0:0.3" From="1" To="0">
        </DoubleAnimation>
    </Storyboard>       
</Window.Resources>

<i:Interaction.Behaviors>
    <Behaviors:NotificationWindowBehavior
        FadeInAnimation="{StaticResource FadeInAnimation}"
        FadeOutAnimation ="{StaticResource FadeOutAnimation}"
    </Behaviors:NotificationWindowBehavior>
</i:Interaction.Behaviors>

这很好用，但是如果我想将此窗口创建为仅隐藏而不关闭的可重用窗口，问题是动画仅在第一次创建窗口时才起作用。所以我提出的当前“解决方案”是检查某种 windowService 如果窗口被隐藏，然后简单地重新创建这样的动画：

if(_propertiesWindow.Visibility == Visibility.Hidden)
{
    var fadeInAnimation = new DoubleAnimation(1, new Duration(new TimeSpan(0, 0, 0, 0, 290)));
    Storyboard.SetTarget(fadeInAnimation, _propertiesWindow);
    Storyboard.SetTargetProperty(fadeInAnimation, new PropertyPath(Window.OpacityProperty));
    var fadeInStoryBoard = new Storyboard();
    fadeInStoryBoard.Children.Add(fadeInAnimation);
    fadeInStoryBoard.Begin();
}
_propertiesWindow.Show();

我正在尝试使用 MVVM 方法并避免代码隐藏/将有关 Windows 的知识仅限于一个特定的 windowService。如前所述，这种方法有效，但我认为它有味道并且想听听是否有可能以某种方式重用已在 xaml 中定义的故事板，以便在从隐藏状态打开窗口时可以使用它。或者是否可以有完全不同的方法来解决这个问题？

隐藏后的动画窗口

0 个答案: