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POBinding and support for rich text formatting
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  1. POBinding and support for rich text formatting
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    copied!<p>Consider the following scenario:</p> <ul> <li><p>I have a <code>ListView</code> that is bound to an <code>ObservableCollection</code> using the <code>DataContext</code>:</p> <pre class="lang-xml prettyprint-override"><code>&lt;ListView ItemsSource="{Binding}"&gt; </code></pre> <p>The <code>class</code> containing the <code>string</code> data uses the <code>DependencyProperty</code> mechanism to keep the displayed content synced with the data collection.</p></li> <li>The <code>ListView</code> has one column that is editable (I followed the tutorial <a href="http://www.switchonthecode.com/tutorials/wpf-tutorial-using-the-listview-part-3-in-place-edit" rel="nofollow">here</a> to achieve this); the <code>ListViewItem</code> is then either a <code>TextBlock</code> or a <code>TextBox</code>. This is done using a <code>DataTemplate</code> and two <code>Style</code> resources.</li> <li>I'd like to format the string displayed in the <code>TextBlock</code> based on a search string. Specifically, I'd like to format the items of the <code>ListView</code> to become bold as the user types in their search query if there is a match (only the characters that match in sequence should be made bold). This only needs to be displayed for the text currently being rendered using the <code>TextBlock</code> (that is, text not currently being edited).</li> </ul> <p>I've considered using an <code>IMultiValueConverter</code> that takes in a reference to the <code>TextBlock</code> that renders the data so that I can format the text appropriately. However, this will destroy the binding that I've set up:</p> <pre class="lang-xml prettyprint-override"><code>&lt;TextBlock.Text&gt; &lt;MultiBinding Converter="{StaticResource searchFormatter}" ConverterParameter="{x:Reference Name=txtSearch}"&gt; &lt;MultiBinding.Bindings&gt; &lt;Binding Path="NameOfBoundDependencyProperty"/&gt; &lt;Binding RelativeSource="{RelativeSource Self}"/&gt; &lt;/MultiBinding.Bindings&gt; &lt;/MultiBinding&gt; &lt;/TextBlock.Text&gt; </code></pre> <p><code>searchFormatter</code> being the <code>IMultiValueConverter</code> and <code>txtSearch</code> being the <code>TextBox</code> containing the search query.</p> <p>I'm still learning WPF so I'm not familiar with the best approach or to what's possible. Is there a way to keep the data bound (so that edits reflect in the collection and the <code>ListView</code>) and still represent the data differently to the user (so that search matches may be bold)? Perhaps it would be cleaner if I manage the binding manually?</p>
 

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