wpf WPF中图像的淡入淡出
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Fade In-Out for image in WPF
提问by Behzad Ashrafian
How can i implement FadeIn and then FadeOut image when i change image source like slide show. my images load from local and web and count of that is varaible. Thankyou
当我更改幻灯片放映等图像源时，如何实现 FadeIn 然后 FadeOut 图像。我的图像从本地和网络加载，并且数量是可变的。谢谢
回答by Clemens
You could write an extension method that fades out the image by animating its Opacityproperty to 0, then sets the Sourceproperty and finally animates the opacity back to 1.
您可以编写一个扩展方法，通过将其Opacity属性设置为 0来淡出图像，然后设置该Source属性，最后将不透明度设置为 1。
public static void ChangeSource(
this Image image, ImageSource source, TimeSpan fadeOutTime, TimeSpan fadeInTime)
{
var fadeInAnimation = new DoubleAnimation(1d, fadeInTime);
if (image.Source != null)
{
var fadeOutAnimation = new DoubleAnimation(0d, fadeOutTime);
fadeOutAnimation.Completed += (o, e) =>
{
image.Source = source;
image.BeginAnimation(Image.OpacityProperty, fadeInAnimation);
};
image.BeginAnimation(Image.OpacityProperty, fadeOutAnimation);
}
else
{
image.Opacity = 0d;
image.Source = source;
image.BeginAnimation(Image.OpacityProperty, fadeInAnimation);
}
}
