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POSilverlight: Animate a data-template property / bind to code-behind?
 

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  1. POSilverlight: Animate a data-template property / bind to code-behind?
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    <p>I'm building a Windows Phone 7 app. For it, I'm making a <code>ListBox</code> that has two modes: editing and not-editing. When it's in editing mode, <code>+</code> and <code>-</code> icons are displayed next to the items. When it's in normal modes, the icons are hidden.</p> <p>I'm trying to figure out how to do this. Here is the control:</p> <pre><code> &lt;Grid x:Name="LayoutRoot"&gt; &lt;ListBox x:Name="ContentListBox"&gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;Grid&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="Auto"/&gt; &lt;ColumnDefinition Width="*" /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;Image Source="{Binding Path=IconSource}" Grid.Column="0" Width="96" Height="96" VerticalAlignment="Center" /&gt; &lt;TextBlock Text="{Binding Path=Name}" Grid.Column="1" /&gt; &lt;/Grid&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;/ListBox&gt; &lt;/Grid&gt; </code></pre> <p>Ideally, I'd like to animate the icons first column to slide from <code>Width="0"</code> to <code>Width="Auto"</code>. I looked into Visual States, but was unsure how to use them.</p> <p>For testing purposes, I am now trying to just bind the first column's visibility to some property indicating if we are in editing mode or not. </p> <p>I could set <code>Width</code> of the first column from code-behind, but I'm not sure how to do that.</p> <p>I tried setting <code>Visibility</code> on <code>ColumnDefinition</code>, but it complained that no such element exists. </p> <p>I could set <code>Visibility</code> on each <code>Image</code>. Ideally, I'd like to bind it to a property in the code-behind instead of a property on each item in the list box. I tried this, but was unable to get it to work:</p> <p>Code behind:</p> <pre><code>public bool Editing { get; set; } </code></pre> <p>XAML:</p> <pre><code> &lt;Image Source="{Binding Path=IconSource}" Grid.Column="0" Width="96" Height="96" VerticalAlignment="Center" Visibility="{Binding Path=Editing, Converter={StaticResource visibilityConverter}}" /&gt; </code></pre> <p>What else can I try? Am I doing something wrong? Ideally, I'd like to just use Visual States.</p>
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