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PO.NET WPF Window FadeIn and FadeOut Animation
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  1. PO.NET WPF Window FadeIn and FadeOut Animation
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    copied!<p>Below is code snippets of a window FadeIn and FadeOut animation:</p> <pre><code>// Create the fade in storyboard fadeInStoryboard = new Storyboard(); fadeInStoryboard.Completed += new EventHandler(fadeInStoryboard_Completed); DoubleAnimation fadeInAnimation = new DoubleAnimation(0.0, 1.0, new Duration(TimeSpan.FromSeconds(0.30))); Storyboard.SetTarget(fadeInAnimation, this); Storyboard.SetTargetProperty(fadeInAnimation, new PropertyPath(UIElement.OpacityProperty)); fadeInStoryboard.Children.Add(fadeInAnimation); // Create the fade out storyboard fadeOutStoryboard = new Storyboard(); fadeOutStoryboard.Completed += new EventHandler(fadeOutStoryboard_Completed); DoubleAnimation fadeOutAnimation = new DoubleAnimation(1.0, 0.0, new Duration(TimeSpan.FromSeconds(0.30))); Storyboard.SetTarget(fadeOutAnimation, this); Storyboard.SetTargetProperty(fadeOutAnimation, new PropertyPath(UIElement.OpacityProperty)); fadeOutStoryboard.Children.Add(fadeOutAnimation); </code></pre> <p>Below are the helper methods which trigger the animation:</p> <pre><code>/// &lt;summary&gt; /// Fades the window in. /// &lt;/summary&gt; public void FadeIn() { // Begin fade in animation this.Dispatcher.BeginInvoke(new Action(fadeInStoryboard.Begin), DispatcherPriority.Render, null); } /// &lt;summary&gt; /// Fades the window out. /// &lt;/summary&gt; public void FadeOut() { // Begin fade out animation this.Dispatcher.BeginInvoke(new Action(fadeOutStoryboard.Begin), DispatcherPriority.Render, null); } </code></pre> <p>The code works great except for two problems:</p> <ol> <li>On FadeIn() the window starts off with an ugly black background then animates correctly.</li> <li>On FadeOut() animates correctly then the window ends off with an ugly black background.</li> </ol> <p>Why is this happening? How do i make this animation run smoothly without the black background hitch?</p>
 

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