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POHow to make add a fade-in/fade-out animation based on ViewModel property value?
 

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  1. POHow to make add a fade-in/fade-out animation based on ViewModel property value?
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    <p>I have a <strong>ViewModel</strong> which exposes the string property <strong>PageToolBarVisible</strong> which can be <strong>true</strong> or <strong>false</strong>:</p> <pre><code>private string _pageToolBarVisible; public string PageToolBarVisible { get { return _pageToolBarVisible; } set { _pageToolBarVisible = value; OnPropertyChanged("PageToolBarVisible"); } } </code></pre> <p>Then on my <strong>View</strong> I have this <strong>DataTrigger</strong> which <strong>displays</strong> or <strong>hides</strong> the toolbar accordingly:</p> <pre><code>&lt;Style x:Key="PageToolBarStyle" TargetType="Border"&gt; &lt;Style.Triggers&gt; &lt;DataTrigger Binding="{Binding PageToolBarVisible}" Value="false"&gt; &lt;Setter Property="Visibility" Value="Collapsed"/&gt; &lt;/DataTrigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; &lt;Border Style="{StaticResource PageToolBarStyle}" DockPanel.Dock="Bottom" Padding="5 5 5 0" Background="#eee"&gt; &lt;Grid Background="#eee"&gt; ... &lt;/Grid&gt; &lt;/Border&gt; </code></pre> <p>How do I now <strong>add an</strong> <strong>animation</strong> so that:</p> <ul> <li>when the ViewModel Property is changed from <strong>true to false</strong>, the <strong>toolbar fades out</strong></li> <li>when the ViewModel Property is changed from <strong>false to true</strong>, the <strong>toolbar fades in</strong></li> </ul> <p>I assume I have to add something like this to my style, but I don't know how or where:</p> <pre><code>&lt;BeginStoryboard&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Storyboard.TargetName="PageToolBar" Storyboard.TargetProperty="(TextBlock.Opacity)" From="0.0" To="1.0" Duration="0:0:3"/&gt; &lt;/Storyboard&gt; &lt;/BeginStoryboard&gt; </code></pre>
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