如何动态添加ObjectAnimationUsingKeyFrames

jozdiy 2010-04-05 07:31:56
我想实现一个点击按钮时触发一个切换图片的功能。图片被包装在xap文件里面了。
代码如下。

<Grid x:Name="LayoutRoot" Background="White" Loaded="LayoutRoot_Loaded">
<Image Margin="82,112,81,124" Grid.Column="1" x:Name="imgTest">
</Image>
<TextBlock Margin="101,60,108,68" Grid.Column="1" Grid.Row="1" Text="TextBlock" TextWrapping="Wrap" d:LayoutOverrides="Width, Height"/>
<Button Click="btnShow_Click" x:Name="btnShow" Width="20" Height="20"></Button>
<StackPanel x:Name="MyPanl">
<StackPanel.Resources>
<Storyboard x:Name="MyStory" >
</Storyboard>
</StackPanel.Resources>
</StackPanel>
</Grid>



C#代码如下

private void LayoutRoot_Loaded(object sender, RoutedEventArgs e)
{
BitmapImage bitmapImages = new BitmapImage();
bitmapImages.UriSource = new Uri("/Test/Te/Dnode.png", UriKind.RelativeOrAbsolute);
imgTest.Source = bitmapImages;


BitmapSource source;
ImageSource im;
var keyFrames = new ObjectAnimationUsingKeyFrames();
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.UriSource = new Uri("/Test/Te/Dnode.png", UriKind.RelativeOrAbsolute);
source = bitmapImage;
im = bitmapImage;

//BitmapSource source = bitmapImage;
//DiscreteObjectKeyFrame keyFrame = new DiscreteObjectKeyFrame();
//keyFrame.Value = bitmapImage;
//keyFrame.KeyTime = TimeSpan.FromSeconds(0.2);
keyFrames.KeyFrames.Add(new DiscreteObjectKeyFrame
{
Value = im,
KeyTime = new TimeSpan(0, 0, 0, 1)
});

bitmapImage = new BitmapImage
{
UriSource = new Uri("/Test/Te/Dnode2.png", UriKind.RelativeOrAbsolute)
};
//source.ClearValue(Image.SourceProperty);
im = bitmapImage;
//source = bitmapImage;
keyFrames.RepeatBehavior = RepeatBehavior.Forever;
keyFrames.KeyFrames.Add(new DiscreteObjectKeyFrame
{
Value = im,
KeyTime = new TimeSpan(0, 0, 0, 1)
});
MyStory.Children.Add(keyFrames);

Storyboard.SetTarget(keyFrames, imgTest);
Storyboard.SetTargetProperty(keyFrames, new PropertyPath(Image.SourceProperty));

}


private void btnShow_Click(object sender, RoutedEventArgs e)
{
MyStory.Begin();
}



有几个问题想问一下。
1.如果我在<Storyboard x:Name="MyStory" >
这里设置了 Storyboard.TargetName和Storyboard.TargetProperty 属性是不是代码中设置就可以不写了。
2.我在xaml代码中这样写

<StackPanel x:Name="MyPanl">
<StackPanel.Resources>
<Storyboard x:Name="MyStory" >
<ObjectAnimationUsingKeyFrames Duration="00:00:00.4"
RepeatBehavior="Forever" Storyboard.TargetName="imag"
Storyboard.TargetProperty="Source">
<DiscreteObjectKeyFrame KeyTime="00:00:00.2" x:Name="Run">
<DiscreteObjectKeyFrame.Value>
<BitmapImage UriSource="/Test/Te/Dnode.png"></BitmapImage>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
<DiscreteObjectKeyFrame KeyTime="00:00:00.2" x:Name="Stop">
<DiscreteObjectKeyFrame.Value>
<BitmapImage UriSource="/Test/Te/Dnode2.png"></BitmapImage>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</StackPanel.Resources>
</StackPanel>

点show的时候可以实现动画。为什么动态添加时不能实现?是不是我的代码有问题。


请各路大神指点一下。快把我搞疯了...


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jozdiy 2010-04-09
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@huo789
谢谢,尽管我现在还是一知半解但还是谢谢你的点拨
huo789 2010-04-07
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代码中存在几个问题
1、没有设置ObjectAnimationUsingKeyFrames 的 Duration
2、KeyTime是关键帧的时间,不能设为一样
3、Value应该设置为BitmapImage,而不是ImageSource

修改后的代码:
//BitmapImage bitmapImages = new BitmapImage();
//bitmapImages.UriSource = new Uri("/Test/Te/Dnode.jpg", UriKind.RelativeOrAbsolute);
//imgTest.Source = bitmapImages;


//BitmapSource source;
//ImageSource im;
var keyFrames = new ObjectAnimationUsingKeyFrames();
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.UriSource = new Uri("/Test/Te/Dnode.png", UriKind.Relative);
//source = bitmapImage;
//im = bitmapImage;

keyFrames.Duration = new Duration(TimeSpan.FromSeconds(3));
keyFrames.RepeatBehavior = RepeatBehavior.Forever;

//BitmapSource source = bitmapImage;
//DiscreteObjectKeyFrame keyFrame = new DiscreteObjectKeyFrame();
//keyFrame.Value = bitmapImage;
//keyFrame.KeyTime = TimeSpan.FromSeconds(0.2);
keyFrames.KeyFrames.Add(new DiscreteObjectKeyFrame
{
Value = bitmapImage,
KeyTime = new TimeSpan(0, 0, 0, 1)
});


BitmapImage bitmapImage2 = new BitmapImage
{
UriSource = new Uri("/Test/Te/Dnode2.png", UriKind.Relative)
};
//source.ClearValue(Image.SourceProperty);
//ImageSource im2 = bitmapImage2;
//source = bitmapImage;

keyFrames.KeyFrames.Add(new DiscreteObjectKeyFrame
{
Value = bitmapImage2,
KeyTime = new TimeSpan(0, 0, 0, 2)
});


MyStory.Children.Add(keyFrames);

Storyboard.SetTarget(keyFrames, imgTest);
Storyboard.SetTargetProperty(keyFrames, new PropertyPath(Image.SourceProperty));
jozdiy 2010-04-07
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我晕。怎么没人呢?是我的问题没有描述清楚吗?

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