Question

我想旋转以及放大然后缩小TextBlock。我想使用Stroyboard并在代码隐藏文件中编写代码。

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525" Loaded="Window_Loaded_1">
    <Grid>
        <StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center">
            <TextBlock Name="rotatingTextBlock" Text="Hello" RenderTransformOrigin="0.5, 0.5"/>
            <TextBlock Text=" World!"/>
        </StackPanel>
    </Grid>
</Window>

...

private void Window_Loaded_1(object sender, RoutedEventArgs e)
{
    TransformGroup tc = new TransformGroup();
    RotateTransform rotateTransform = new RotateTransform();
    tc.Children.Add(rotateTransform);
    ScaleTransform scaleTransform = new ScaleTransform();
    tc.Children.Add(scaleTransform);

    rotatingTextBlock.RenderTransform = tc;

    Storyboard storyboard = new Storyboard();
    DoubleAnimation rotateAnimation = new DoubleAnimation(0, 360, new Duration(TimeSpan.FromSeconds(2)));
    rotateAnimation.AccelerationRatio = 0.15;
    rotateAnimation.DecelerationRatio = 0.15;
    Storyboard.SetTarget(rotateAnimation, rotateTransform);
    Storyboard.SetTargetProperty(rotateAnimation, new PropertyPath(RotateTransform.AngleProperty));
    storyboard.Children.Add(rotateAnimation);

    DoubleAnimation scaleAnimation = new DoubleAnimation(1, 1.2, new Duration(TimeSpan.FromSeconds(1)));
    scaleAnimation.AccelerationRatio = 0.5;
    scaleAnimation.DecelerationRatio = 0.5;
    scaleAnimation.AutoReverse = true;
    Storyboard.SetTarget(scaleAnimation, scaleTransform);
    Storyboard.SetTargetProperty(scaleAnimation, new PropertyPath(ScaleTransform.ScaleXProperty));
    storyboard.Children.Add(scaleAnimation);

    storyboard.Begin();
}

我的代码不起作用。我错过了什么吗？

Answer 1

根据Storyboard.SetTarget only works on UIElements, but throws no exception，您似乎无法直接定位Transform。如果您使用正确的TextBlock定位PropertyPath，则可以使用

Storyboard storyboard = new Storyboard();
DoubleAnimation rotateAnimation = new DoubleAnimation(0, 360, new Duration(TimeSpan.FromSeconds(2)));
rotateAnimation.AccelerationRatio = 0.15;
rotateAnimation.DecelerationRatio = 0.15;
Storyboard.SetTarget(rotateAnimation, rotatingTextBlock);
Storyboard.SetTargetProperty(rotateAnimation, new PropertyPath("RenderTransform.Children[0].(RotateTransform.Angle)"));
storyboard.Children.Add(rotateAnimation);

DoubleAnimation scaleAnimation = new DoubleAnimation(1, 1.2, new Duration(TimeSpan.FromSeconds(1)));
scaleAnimation.AccelerationRatio = 0.5;
scaleAnimation.DecelerationRatio = 0.5;
scaleAnimation.AutoReverse = true;
Storyboard.SetTarget(scaleAnimation, rotatingTextBlock);
Storyboard.SetTargetProperty(scaleAnimation, new PropertyPath("RenderTransform.Children[1].(ScaleTransform.ScaleX)"));
storyboard.Children.Add(scaleAnimation);

Answer 2

以下作品：

Storyboard storyboard = new Storyboard();
DoubleAnimation rotateAnimation = new DoubleAnimation(0, 360, new Duration(TimeSpan.FromSeconds(2)));
rotateAnimation.AccelerationRatio = 0.15;
rotateAnimation.DecelerationRatio = 0.15;
try { UnregisterName("rotateTransform"); }
catch { }
finally { RegisterName("rotateTransform", rotateTransform); }
Storyboard.SetTargetName(rotateAnimation, "rotateTransform");
Storyboard.SetTargetProperty(rotateAnimation, new PropertyPath(RotateTransform.AngleProperty));
storyboard.Children.Add(rotateAnimation);

DoubleAnimation scaleAnimation = new DoubleAnimation(1, 1.2, new Duration(TimeSpan.FromSeconds(1)));
scaleAnimation.AccelerationRatio = 0.5;
scaleAnimation.DecelerationRatio = 0.5;
scaleAnimation.AutoReverse = true;
try { UnregisterName("scaleTransform"); }
catch { }
finally { RegisterName("scaleTransform", scaleTransform); }
Storyboard.SetTargetName(scaleAnimation, "scaleTransform");
Storyboard.SetTargetProperty(scaleAnimation, new PropertyPath(ScaleTransform.ScaleXProperty));
storyboard.Children.Add(scaleAnimation);

storyboard.Begin(this);

然而，我尝试了LPL的解决方案并且也有效 - 如果LPL的方法适用于任何“抽象”目标，那么我认为我更喜欢它作为解决方案（保存注册名称等）。（问题是我不知道如何将这些属性路径组合在一起！）

故事板不起作用

2 个答案: