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PODataTrigger that doesn't undo itself when condition no longer met
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  1. PODataTrigger that doesn't undo itself when condition no longer met
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    copied!<p>Is there a way to do something like the following?</p> <pre><code>&lt;Style TargetType="{x:Type: TreeViewItem}"&gt; &lt;Style.Triggers&gt; &lt;DataTrigger Binding="~Complex Binding~" Value="True" DoNotUnset="True"&gt; &lt;Setter Property="IsExpanded" Value="True"/&gt; &lt;/DataTrigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; </code></pre> <p>What I basically would like is this to be a "No Undo DataTrigger" if you will. When the Value is no longer "True" I don't want it to set "IsExpanded" back to its previous value.</p> <p>Here is my attempt to do this using enter actions but this also has problems.</p> <pre><code>&lt;Style TargetType="{x:Type: TreeViewItem}"&gt; &lt;Style.Triggers&gt; &lt;DataTrigger Binding="~Complex Binding~" Value="True"&gt; &lt;DataTrigger.EnterActions&gt; &lt;BeginStoryboard&gt; &lt;BeginStoryboard.Storyboard&gt; &lt;Storyboard&gt; &lt;BooleanAnimationUsingKeyFrames Storyboard.TargetProperty="(IsExpanded)" Duration="00:00:01" FillBehavior="Stop"&gt; &lt;BooleanKeyFrameCollection&gt; &lt;DiscreteBooleanKeyFrame KeyTime="00:00:00" Value="True"/&gt; &lt;/BooleanKeyFrameCollection&gt; &lt;/BooleanAnimationUsingKeyFrames&gt; &lt;/Storyboard&gt; &lt;/BeginStoryboard.Storyboard&gt; &lt;/BeginStoryboard&gt; &lt;/DataTrigger.EnterActions&gt; &lt;/DataTrigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; </code></pre> <p>First this is insanely verbose but secondly this only works for the duration of the BooleanAnimationUsingKeyFrames. If I change the FillBehavior to "HoldEnd" then it looks correct but now the user can no longer un-expand the treeviewitem by clicks (though oddly enough they still can by using the keyboard). </p> <p>For those who are wondering: yes I'm trying to expand all items in a tree view by binding because I don't want to build a recursive ItemsGenerator.GetItemContainerFromIndex(i) loop. I'd still like to use a similar "No Undo Datatigger" in other areas of my code.</p>
 

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