动画打破绑定 [英] Animation breaks binding

问题描述

我有一个 ComboBox ，其 Opacity 属性具有以下绑定：

I have a ComboBox whose Opacity property has the following binding:

Opacity="{Binding ElementName=stackPanel, Path=IsMouseOver, Converter={StaticResource mouseOverConverter}}"

基本上，如果 IsMouseOver 属性为true，则 ComboBox 的不透明度为1，否则为0.4。

Basically, if the IsMouseOver property is true, the ComboBox has an Opacity of 1, otherwise 0.4.

现在我将此动画应用于 ComboBox ：

Now I apply this animation to the ComboBox:

private void AnimateComboBox()
{
  DoubleAnimation da = new DoubleAnimation();
  da.From = 0.4;
  da.To = 1;
  da.Duration = TimeSpan.FromSeconds(0.8);
  da.AutoReverse = true;

  ComboClassList.BeginAnimation(ComboBox.OpacityProperty, da);  
}

效果很好，但随后绑定 ComboBox 不再起作用。当我将鼠标移到 StackPanel 上时，不透明度不会改变。为什么动画会破坏我的束缚？ Snoop说，绑定仍然存在，只是在Snoop中以红色突出显示。

That works well, but afterwards the binding of the ComboBox doesn't work anymore. The Opacity doesn't change when I move my mouse over the StackPanel. Why does the animation break my binding? Snoop says, the binding still exists, altough it's highlighted red in Snoop.

推荐答案

默认情况下，动画保留最终属性值。要更改此设置，请将其 FillBehavior 属性设置为 Stop ：

The animation is by default holding the final property value. To change that, set its FillBehavior property to Stop:

var animation = new DoubleAnimation
{
    From = 0.4,
    To = 1,
    Duration = TimeSpan.FromSeconds(0.8),
    AutoReverse = true,
    FillBehavior = FillBehavior.Stop
};

动画结束时，属性将重新设置为绑定提供的值。

When the animation ends, the property will be set back to the value provided by the binding.

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