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POWPF DoubleAnimation does not decrease the value after an animation
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  1. POWPF DoubleAnimation does not decrease the value after an animation
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    copied!<p>Consider the following simple WPF form, we will try to animate border1's Height:</p> <p><img src="https://i.stack.imgur.com/YYlZk.png" alt="alt text"></p> <p>This is the XAML for border1:</p> <pre><code>&lt;Border Margin="3" BorderBrush="Black" BorderThickness="1" Name="border1"&gt; &lt;Border.Style&gt; &lt;Style&gt; &lt;Setter Property="Control.Height" Value="50" /&gt; &lt;Style.Triggers&gt; &lt;DataTrigger Binding="{Binding X}" Value="1"&gt; &lt;DataTrigger.EnterActions&gt; &lt;BeginStoryboard&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Duration="0:0:0.2" Storyboard.TargetProperty="Height" To="100" /&gt; &lt;/Storyboard&gt; &lt;/BeginStoryboard&gt; &lt;/DataTrigger.EnterActions&gt; &lt;/DataTrigger&gt; &lt;DataTrigger Binding="{Binding X}" Value="2"&gt; &lt;DataTrigger.EnterActions&gt; &lt;BeginStoryboard&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Duration="0:0:0.2" Storyboard.TargetProperty="Height" To="200" /&gt; &lt;/Storyboard&gt; &lt;/BeginStoryboard&gt; &lt;/DataTrigger.EnterActions&gt; &lt;/DataTrigger&gt; &lt;DataTrigger Binding="{Binding X}" Value="3"&gt; &lt;DataTrigger.EnterActions&gt; &lt;BeginStoryboard&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Duration="0:0:0.2" Storyboard.TargetProperty="Height" To="300" /&gt; &lt;/Storyboard&gt; &lt;/BeginStoryboard&gt; &lt;/DataTrigger.EnterActions&gt; &lt;/DataTrigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; &lt;/Border.Style&gt; &lt;TextBlock Text="{Binding X}" /&gt; &lt;/Border&gt; </code></pre> <p>X is a normal <code>DependencyProperty</code> and buttons do their work without problem and TextBlock's content inside border1 shows the changed value.</p> <p>Now the <strong>problem</strong> is Height can be only <em>Increased</em>! For example by pressing 1, Height increases to 100, pressing 3 increases it to 300 <strong>but</strong> pressing 2 does not change the height.</p> <p>If I set the initial border1's height to, for example, 400, all buttons can decrease it to 100, 200 or 300 but after this stage no animation can decrease border's height.</p> <p>Am I missing some obvious point regarding WPF animation?</p>
 

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