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POWhy does Style not work proper on Popup in WPF?
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  1. POWhy does Style not work proper on Popup in WPF?
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    copied!<p>I am not sure if i do not use the correct way, so I try to describe my case here. Please help to point out the detail.</p> <p>The purpose of mine is to customize the WPF <code>Popup</code> class and implement a specific popup panel. I use the CustomControl to implement this as below:</p> <p>Here is the <code>Generic.xaml</code> </p> <pre><code>&lt;ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:WpfApplication3"&gt; &lt;Style TargetType="{x:Type local:CCPopup}"&gt; &lt;Setter Property="AllowsTransparency" Value="True" /&gt; &lt;Setter Property="StaysOpen" Value="False" /&gt; &lt;Setter Property="Placement" Value="Center" /&gt; &lt;Setter Property="Child"&gt; &lt;Setter.Value&gt; &lt;Border Background="Red" Width="30" Height="30" /&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/ResourceDictionary&gt; </code></pre> <p>and the following is the code, which only register the meta style information:</p> <pre><code>public class CCPopup : Popup { static CCPopup() { DefaultStyleKeyProperty.OverrideMetadata(typeof(CCPopup), new FrameworkPropertyMetadata(typeof(CCPopup))); } } </code></pre> <p>The problems I met until now can be summarized as below:</p> <p>1) I try to write:</p> <pre><code>&lt;ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:WpfApplication3"&gt; &lt;Style TargetType="{x:Type local:CCPopup}" BasedOn="{StaticResource {x:Type Popup}}"&gt; &lt;Setter Property="AllowsTransparency" Value="True"/&gt; &lt;Setter Property="StaysOpen" Value="False" /&gt; &lt;Setter Property="Placement" Value="Center" /&gt; &lt;Setter Property="Child"&gt; &lt;Setter.Value&gt; &lt;Border Background="Red" Width="30" Height="30" /&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/ResourceDictionary&gt; </code></pre> <p>But this does not works, and I got the error <code>{x:Type Popup}</code> could not be resolved. Why?</p> <p>About my MainWindow.xaml: I only add <code>&lt;CCPopup x:Key="popup" /&gt;</code> in its resource and create a button, when I click the button, I bind the popup's <code>PlacementTarget</code> to this button and set popup's <code>IsOpen</code> property to true in code. </p> <p>2) When I create a instance of CCPopup in the code, such as <code>CCPopup p = new CCPopup()</code>, some of the Style does not works, such as <code>AllowsTransparency</code> and <code>StaysOpen</code>, will not be set to the value I give in the xaml Style. But when I create a instance from xaml <code>&lt;CCPopup x:Key="popup" /&gt;</code> and refer to it from resource in code, the style works correctly. Can you point out where I made a mistake ?</p> <p>3) Just curious about why <code>Popup</code> class do not have <code>Template</code> property?</p> <p>Thanks for your help.</p>
 

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