如何对Visibility属性进行动画(XMAL /CS)

更新：2007 年 11 月

对指定 Duration 内的一组 KeyFrames 中的 Object 属性值进行动画处理。

命名空间：  System.Windows.Media.Animation
程序集：  PresentationCore （在 PresentationCore.dll 中）
用于 XAML 的 XMLNS： http://schemas.microsoft.com/winfx/xaml/presentation

参考：

http://social.msdn.microsoft.com/Forums/zh-HK/wpf/thread/7d856f82-d112-4a1c-a457-1aeb1abe861b

http://technet.microsoft.com/zh-cn/office/system.windows.uielement.visibility%28it-it,VS.95%29.aspx

XAML实现:

1. <Border Height="100" Width="80" CornerRadius="11,11,11,11" Margin="5" BorderThickness="2" Background="Brown" IsEnabled="False" Name="Bord11">
2. <Border.Triggers>
3. <EventTrigger RoutedEvent="Border.Loaded" >
4. <EventTrigger.Actions>
5. <BeginStoryboard>
6. <Storyboard>
7. <ObjectAnimationUsingKeyFrames  Storyboard.TargetProperty="Visibility" Duration="0:0:4">
8. <ObjectAnimationUsingKeyFrames.KeyFrames>
9. <DiscreteObjectKeyFrame KeyTime="0:0:1" >
10. <DiscreteObjectKeyFrame.Value>
11. <Visibility>Visible</Visibility>
12. </DiscreteObjectKeyFrame.Value>
13. </DiscreteObjectKeyFrame>
14. <DiscreteObjectKeyFrame KeyTime="0:0:2" >
15. <DiscreteObjectKeyFrame.Value>
16. <Visibility>Hidden</Visibility>
17. </DiscreteObjectKeyFrame.Value>
18. </DiscreteObjectKeyFrame>
19. <DiscreteObjectKeyFrame KeyTime="0:0:3" >
20. <DiscreteObjectKeyFrame.Value>
21. <Visibility>Collapsed</Visibility>
22. </DiscreteObjectKeyFrame.Value>
23. </DiscreteObjectKeyFrame>
24. </ObjectAnimationUsingKeyFrames.KeyFrames>
25. </ObjectAnimationUsingKeyFrames>
26. </Storyboard>
27. </BeginStoryboard>
28. </EventTrigger.Actions>
29. </EventTrigger>
30. </Border.Triggers>
31. <Label Height="39" Name="label1" Width="62">ABCDEFGH</Label>
32. </Border>

<Border Height="100" Width="80" CornerRadius="11,11,11,11" Margin="5" BorderThickness="2" Background="Brown" IsEnabled="False" Name="Bord11">
<Border.Triggers>
<EventTrigger RoutedEvent="Border.Loaded" >
<EventTrigger.Actions>
<BeginStoryboard>
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Duration="0:0:4">
<ObjectAnimationUsingKeyFrames.KeyFrames>
<DiscreteObjectKeyFrame KeyTime="0:0:1" >
<DiscreteObjectKeyFrame.Value>
<Visibility>Visible</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
<DiscreteObjectKeyFrame KeyTime="0:0:2" >
<DiscreteObjectKeyFrame.Value>
<Visibility>Hidden</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
<DiscreteObjectKeyFrame KeyTime="0:0:3" >
<DiscreteObjectKeyFrame.Value>
<Visibility>Collapsed</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>

</ObjectAnimationUsingKeyFrames.KeyFrames>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger.Actions>
</EventTrigger>
</Border.Triggers>
<Label Height="39" Name="label1" Width="62">ABCDEFGH</Label>
</Border>

后台实现：

1. ObjectAnimationUsingKeyFrames animate = new ObjectAnimationUsingKeyFrames();
2. animate.Duration = new TimeSpan(0,0,4);
3. animate.RepeatBehavior = RepeatBehavior.Forever;
4. DiscreteObjectKeyFrame kf1 = new DiscreteObjectKeyFrame(Visibility.Visible, new TimeSpan(0, 0, 1));
5. DiscreteObjectKeyFrame kf2 = new DiscreteObjectKeyFrame(Visibility.Hidden, new TimeSpan(0, 0, 2));
6. DiscreteObjectKeyFrame kf3 = new DiscreteObjectKeyFrame(Visibility.Collapsed, new TimeSpan(0, 0,3));
7. animate.KeyFrames.Add(kf1);
8. animate.KeyFrames.Add(kf2);
9. animate.KeyFrames.Add(kf3);
10. Bord11.BeginAnimation(Border.VisibilityProperty, animate);

ObjectAnimationUsingKeyFrames animate = new ObjectAnimationUsingKeyFrames();
animate.Duration = new TimeSpan(0,0,4);
animate.RepeatBehavior = RepeatBehavior.Forever;
DiscreteObjectKeyFrame kf1 = new DiscreteObjectKeyFrame(Visibility.Visible, new TimeSpan(0, 0, 1));
DiscreteObjectKeyFrame kf2 = new DiscreteObjectKeyFrame(Visibility.Hidden, new TimeSpan(0, 0, 2));
DiscreteObjectKeyFrame kf3 = new DiscreteObjectKeyFrame(Visibility.Collapsed, new TimeSpan(0, 0,3));
animate.KeyFrames.Add(kf1);
animate.KeyFrames.Add(kf2);
animate.KeyFrames.Add(kf3);
Bord11.BeginAnimation(Border.VisibilityProperty, animate);

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