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POListView with nested Expander not collapsing
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  1. POListView with nested Expander not collapsing
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    copied!<p>This question is the same as this other <a href="https://stackoverflow.com/questions/1381336/cant-get-wpf-listview-to-collapse-when-expanders-in-the-listview-collapse">unanswered question</a>.</p> <p>When the <em>Expander</em> is expanded the outer <em>ListView</em> grows to make space for the expanders contents, but when the <em>Expander</em> is then collapsed the view does not force the ListView to resize.</p> <p>Reduced code, with notes after:</p> <pre><code>&lt;!--&lt;StackPanel&gt;--&gt; &lt;ItemsControl&gt; &lt;!-- ParameterGroupView --&gt; &lt;Border BorderBrush="Brown" BorderThickness="1" CornerRadius="4" Padding="4"&gt; &lt;ListView HorizontalContentAlignment="Stretch"&gt; &lt;Expander Header="Expander A" IsExpanded="False"&gt; &lt;ListView HorizontalContentAlignment="Stretch"&gt; &lt;!-- TextView --&gt; &lt;TextBlock &gt;Content A&lt;/TextBlock&gt; &lt;TextBlock &gt;Content B&lt;/TextBlock&gt; &lt;/ListView&gt; &lt;/Expander&gt; &lt;/ListView&gt; &lt;/Border&gt; &lt;/ItemsControl&gt; &lt;!--&lt;/StackPanel&gt;--&gt; </code></pre> <p>I have the <em>ParameterGroupView</em> in a <em>ItemsControl</em> or <em>StackPanel</em> because there is actually many <em>ParameterGroupView</em> entries. Swapping to a <em>StackPanel</em> does not change the behaviour.</p> <p>Removing the <em>Boarder</em> does not affect the behaviour, but having it helps show the behaviour with only a single <em>ParameterGroupView</em>.</p> <p>There can be many <em>Expander</em> sections in the outer <em>ListView</em>, and the <em>Expander</em> can have many entities inside the inner <em>ListView</em>.</p> <p>The outer <em>ListView</em> and <em>Expander</em> is to replace a <em>TreeView</em>, that was used to have a list of collapsible nodes, but the <em>TreeView</em>'s internal use of grids, means the TextView items were squashed horizonatlly, the same as if you remove ether <em>HorizontalContentAlignment="Stretch"</em> attributes.</p> <p>So if there is another way to wrap/wire all this up, I'll be also happy. </p> <p>This is a problem because our <em>TextView</em> blocks are large and there are many <em>Expander</em>s.</p> <p>Edit: <em>TextView</em> is used as the code is data-bound, and thus dynamically put together. So any replacement for ListView would need some form of <em>ItemsSource</em> </p>
 

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