WPF 从代码触发动画

Question

我正在阅读许多类似的问答，但没有得到我正在寻找的答案。所以，我在 Microsoft Bled 中制作 "homework"，我真的很喜欢故事板，我知道如何通过单击按钮触发它们，但是有谁知道如何在 c# 中启动动画，例如在 if 语句中。

感谢您的回答和提前花时间！

Answer 1

您可以通过为其命名并引用该名称以使用 Begin 方法从代码隐藏访问故事板。

<Canvas MouseLeftButtonDown="Handle_MouseDown"
  Background="Gray" Width="600" Height="500">
    <Canvas.Resources>
      <Storyboard x:Name="myStoryboard">
        <PointAnimation
          x:Name="myPointAnimation"
          Storyboard.TargetProperty="Center"
          Storyboard.TargetName="MyAnimatedEllipseGeometry"
          Duration="0:0:2"/>
      </Storyboard>
    </Canvas.Resources>

    <Path Fill="Blue">
      <Path.Data>
        <EllipseGeometry x:Name="MyAnimatedEllipseGeometry"
         Center="200,100" RadiusX="15" RadiusY="15" />
      </Path.Data>
    </Path>

</Canvas>

代码隐藏：

private void Handle_MouseDown(object sender, MouseButtonEventArgs e)
{
    // Retrieve current mouse coordinates.
    double newX = e.GetPosition(null).X;
    double newY = e.GetPosition(null).Y;
    Point myPoint = new Point();
    myPoint.X = newX;
    myPoint.Y = newY;
    myPointAnimation.To = myPoint;
    myStoryboard.Begin();
}

Answer 2

public static class AnimationHelper
{
    private static void AnimateOpacity(DependencyObject target, double from, double to)
    {
        var opacityAnimation = new DoubleAnimation
        {
            From = from,
            To = to,
            Duration = TimeSpan.FromMilliseconds(500)
        };

        Storyboard.SetTarget(opacityAnimation, target);
        Storyboard.SetTargetProperty(opacityAnimation, "Opacity");

        var storyboard = new Storyboard();
        storyboard.Children.Add(opacityAnimation);
        storyboard.Begin();
    }

    /// <summary>
    /// Fades in the given dependency object.
    /// </summary>
    /// <param name="target">The target dependency object to fade in.</param>
    public static void FadeIn(DependencyObject target)
    {
        AnimateOpacity(target, 0, 1);
    }
}

Answer 3

您正在寻找这个 thread。

另一种方式是：

Storyboard sb = this.FindResource("Storyboard1") as Storyboard;
if (sb != null){ BeginStoryboard(sb); }

WPF 从代码触发动画

WPF trigger animation from code

c#

wpf

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