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POWPF ListBox does not realise that its items have changed size
 

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  1. POWPF ListBox does not realise that its items have changed size
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    <p>I have a <code>ListBox</code> that contains a number of <code>User</code> items that are <code>DataTemplate</code>d to appear as <code>UserControl</code>s in the <code>ListBox</code>. Each <code>UserControl</code> can be expanded in size. To start with, the <code>ListBox</code> is big enough to display them all in their unexpanded state. The problem that I have is that when a number of these <code>UserControl</code>s are expanded together, they extend out of the <code>ListBox</code>'s visible area. The <code>ListBox</code> does not recognise this fact and no <code>ScrollBar</code>s appear, even when they are set to <code>Visible</code>.</p> <p>I am using <code>DoubleAnimation</code>s to alter the <code>UserControl</code> heights when the user clicks on a button in each one. Is there something that I have to do, or some setting on the <code>ListBox</code> that must be set to get it to register the size changes of the <code>UserControl</code>s that represent its items and display <code>ScrollBar</code>s when needed?</p> <p>Edit>>></p> <p>I have tracked down the problem to a custom <code>WrapPanel</code> that I am using in the <code>ListBox.ItemsPanel</code>. When I remove it, or replace it with a standard <code>WrapPanel</code>, <code>ScrollBar</code>s appear when required. I got the code for the <code>Panel</code> from a good article about <a href="http://www.switchonthecode.com/tutorials/wpf-tutorial-creating-a-custom-panel-control" rel="nofollow">creating custom WPF panels</a>. Can anyone see what's missing from the code given in the article and why it might stop the <code>ScrollBar</code>s from displaying?</p>
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    1. USSheridan
    1. USSheridan
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    1. COAre you animating Height? In that case, I see no reason that your `ListBox` wouldn't adjust. You are not using RenderTransform, are you?
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      1. USFredrik Hedblad
    2. COI'm unable to reproduce this. Can you add some sample code to your question?
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      1. USFredrik Hedblad
    3. COI am applying a `TranslateTransform` on the `UIElement.RenderTransfrom` property of each of the `Panel.Children` in the `ArrangeOverride` method of the custom `WrapPanel`. Does that make a difference?
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      1. USSheridan
 

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