rocmemory
为轮子而生
采纳率60%
2016-04-15 09:56

执行动画后再设置Canvas.Left值不起作用

1
已采纳

一个很奇怪的问题,不知道大家遇到过没有:
1、在Canvas中直接设置元素位置,是有效果的,比如 Canvas.SetLeft(box, 50);
2、使用一个StoryBoard或直接BeginAnimation动画改变位置,也是有效果的 (见test1_Click)
3、在使用动画改变元素位置后,再使用Canvas.SetLeft,纹丝不动!!?

XAML代码:

 <Canvas>
    <Border x:Name="box" Width="100" Height="100" Background="Blue" Canvas.Left="150" Canvas.Top="90"/>
    <Button x:Name="test1" Content="test1" Height="27" Canvas.Left="441" Canvas.Top="17" Width="57" Click="test1_Click"/>
    <Button x:Name="test2" Content="test2" Height="27" Canvas.Left="441" Canvas.Top="57" Width="57" Click="test2_Click"/>
</Canvas>

后台代码:

 private void test1_Click(object sender, RoutedEventArgs e)
{

    //((Storyboard)this.Resources["move"]).Begin();

    KeyTime time_layout = KeyTime.FromTimeSpan(TimeSpan.FromMilliseconds(200));

    Storyboard sb = new Storyboard();

    DoubleAnimationUsingKeyFrames da = new DoubleAnimationUsingKeyFrames();
    sb.Children.Add(da);
    Storyboard.SetTarget(da, box);
    Storyboard.SetTargetProperty(da, new PropertyPath("(Canvas.Left)"));

    EasingDoubleKeyFrame kf_left = new EasingDoubleKeyFrame { KeyTime = time_layout, Value = 200 };
    da.KeyFrames.Add(kf_left);

    sb.Begin();

}

private void test2_Click(object sender, RoutedEventArgs e)
{
    Canvas.SetLeft(box, 50);
}
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