c# - 将新创建的对象传递给多个 Storyboard

Question

我有以下设置。

    <Window.Resources>

    <Storyboard x:Key="Storyboard1">
        <DoubleAnimationUsingPath 
            Duration="0:0:2" 
            Source="X" 
            Completed="Timeline_OnCompleted"
            Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(TranslateTransform.X)" >
            <DoubleAnimationUsingPath.PathGeometry>
                <PathGeometry Figures="M42.473003,3.8059855 L281.428,3.8059855"/>
            </DoubleAnimationUsingPath.PathGeometry>
        </DoubleAnimationUsingPath>
        <DoubleAnimationUsingPath Duration="0:0:2" Source="Y" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(TranslateTransform.Y)">
            <DoubleAnimationUsingPath.PathGeometry>
                <PathGeometry Figures="M42.473003,3.8059855 L281.428,3.8059855"/>
            </DoubleAnimationUsingPath.PathGeometry>
        </DoubleAnimationUsingPath>
    </Storyboard>

    <Storyboard x:Key="Storyboard2">
        <DoubleAnimationUsingPath Duration="0:0:2" Source="X" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(TranslateTransform.X)" >
            <DoubleAnimationUsingPath.PathGeometry>
                <PathGeometry Figures="M286.789,2.116 L420.289,-184.884 L306.789,-240.384"/>
            </DoubleAnimationUsingPath.PathGeometry>
        </DoubleAnimationUsingPath>
        <DoubleAnimationUsingPath Duration="0:0:2" Source="Y" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(TranslateTransform.Y)">
            <DoubleAnimationUsingPath.PathGeometry>
                <PathGeometry Figures="M286.789,2.116 L420.289,-184.884 L306.789,-240.384"/>
            </DoubleAnimationUsingPath.PathGeometry>
        </DoubleAnimationUsingPath>
    </Storyboard>

</Window.Resources>


<Grid>
    <Canvas x:Name="Animation_Path" Canvas.Left="3.409" Canvas.Top="53.412" Margin="155.184,649.19,0,0" RenderTransformOrigin="0.5,0.5"/>


    <Button Content="Start" HorizontalAlignment="Left" Margin="588,252,0,0" VerticalAlignment="Top" Width="75" Click="Button_Click_5"/>


</Grid>

及其背后的代码。

        private void Button_Click_5(object sender, RoutedEventArgs e)
    {
        ObjectToMove move = new ObjectToMove();
        Animation_Path.Children.Add(move);

        var sb1 = FindResource("Storyboard1") as Storyboard;
        sb1.Begin(move);
    }

我得到了这个工作。但是如何在第一个完成后将新创建的对象传递给第二个 storyboard2 ..？如果可能的话，我更喜欢在代码中这样做。

Answer 1

据我了解，您可以为此使用 Completed 事件。让我们尝试一下，使用多个 Storyboard序列。

附言。欢迎任何关于将事件处理程序转换为等待格式的评论。

using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

private void Button_Click_5(object sender, RoutedEventArgs e)
{
    var move1 = new ObjectToMove();
    Animation_Path.Children.Add(move1);

    var storyBoardsToRun = new[] {"Storyboard1", "Storyboard2"};

    storyBoardsToRun 
        .Select(sbName => FindResource(sbName) as Storyboard)
        .ToList()
        .ForEach(async sb => await sb.BeginAsync(move1));
}

public static class StoryBoardExtensions
{
    public static Task BeginAsync(this Storyboard sb, FrameworkContentElement element)
    {
        var source = new TaskCompletionSource<object>();
        sb.Completed += delegate
        {
            source.SetResult(null);
        };
        sb.Begin(element);
        return source.Task;
    }
}