* any * wpf控件的动画背景不透明度

Question

I want an effect where I can animate the background opacity of any GroupBox control.
This would give me additional visual notification if something changes - I can flash the control to indicate the new status.

I have

private void ToggleBackgroundFade(Control control)
{
    var duration = new TimeSpan(0, 0, 0, 0, 200);

    var animation = new DoubleAnimation { From = 1.0, To = 0.0, Duration = new Duration(duration) };
    // new brush because old one is frozen
    control.Background = new SolidColorBrush(Color.FromArgb(0xFF, 0xD6, 0xEF, 0xD1));
    control.Background.BeginAnimation(OpacityProperty, animation);
}

private void KickoffFlashingAnimation(Control controlToFade)
{
    controlToFade.Dispatcher.BeginInvoke(new Action(() => 
        ToggleBackgroundFade(controlToFade))
    );
}

and all with style

<Style x:Key="GroupBoxHeader" TargetType="{x:Type GroupBox}">
    ...
    <Setter Property="Background" Value="#00D6EFD1" />
</Style>

so I want to pass any GroupBox to the KickoffFlashingAnimation() method.

It runs fine, with no errors, but the groupbox doesn't change color after initially being set to the light green #ffd6efd1..
Any tips?

Answer 1

嗨，我已经尝试了上面的代码，并且对我来说对Groupbox来说效果很好.Groupbox可能存在问题，即它的所有Content区域都填充了其他控件，这些控件最终隐藏了Background.So，只需对其进行测试，就可以给您的GroupBox内容比控件中的宽度更大，然后尝试通过传递GroupBox的实例来运行上面的动画代码，希望对您有所帮助。