Question

如果我在可视图层中创建并启动动画，我可以使用StopAnimation来停止动画。但是，当我这样做时，似乎需要一段时间才能停止动画并使用最新值更新属性。那有什么办法吗？在下面的代码中，我等待10毫秒，但这有时只能起作用。

aws ecs list-container-instances --cluster default

Answer 1

您可以使用CompositionScopedBatch来解决此问题。需要注意的一点是，如果您有无限次的迭代次数，我会立即触发Completed事件（我不知道为什么）。这是一个示例：

public sealed partial class MainPage : Page
{
    SpriteVisual MyVisual;
    CompositionScopedBatch ScopedBatch;

    public MainPage()
    {
        this.InitializeComponent();

        PointerReleased += MainPage_PointerReleased;
    }

    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        base.OnNavigatedTo(e);

        var compositor = ElementCompositionPreview.GetElementVisual(this).Compositor;

        MyVisual = compositor.CreateSpriteVisual();

        MyVisual.Size = new Vector2(80, 80);
        MyVisual.Offset = new Vector3(50, 50, 0);
        MyVisual.Brush = compositor.CreateColorBrush(Colors.Green);

        ElementCompositionPreview.SetElementChildVisual(this, MyVisual);

        ScopedBatch = compositor.CreateScopedBatch(CompositionBatchTypes.Animation);

        var animation = compositor.CreateVector3KeyFrameAnimation();
        animation.InsertKeyFrame(1, new Vector3(300, 50, 0));
        animation.Duration = TimeSpan.FromSeconds(3);
        // animation.IterationBehavior = AnimationIterationBehavior.Forever;
        // CompositionScopedBatch.Completed is triggered immediately if Infinite is used.
        // Use many iterations instead.
        animation.IterationBehavior = AnimationIterationBehavior.Count;
        animation.IterationCount = 1000000;

        MyVisual.StartAnimation(nameof(MyVisual.Offset), animation);

        ScopedBatch.Completed += CompositionScopedBatch_Completed;

        ScopedBatch.End();
    }

    private void CompositionScopedBatch_Completed(object sender, CompositionBatchCompletedEventArgs args)
    {
        System.Diagnostics.Debug.WriteLine("Position when batch completed: " + MyVisual.Offset);
    }

    private void MainPage_PointerReleased(object sender, PointerRoutedEventArgs e)
    {
        System.Diagnostics.Debug.WriteLine("Position when animation running: " + MyVisual.Offset);

        MyVisual.StopAnimation(nameof(MyVisual.Offset));
    }
}

如何检测动画停止和属性更新的时间？

1 个答案: