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When you define a custom template, all of the visual cues of the default template are removed as well. For example, the default button template contains markup which informs the control how to look when certain UI events occur, such as when it receives focus, when it is clicked with the mouse, when it is enabled (or disabled), and so on. Users are quite accustomed to these sort of visual cues, as it gives the control somewhat of a tactile response. However, your RoundButtonTemplate does not define any such markup, so the look of the control is identical regardless of the mouse activity. Ideally, your control should look slightly different when clicked (maybe via a color change or drop shadow) to let the user know the visual state has changed. When WPF was first released, the way to add in such visual cues was to add to the template any number of triggers which would typically change values of object properties or start a storyboard animation (or both) when the trigger condition was true. By way of example, update your RoundButtonTemplate with the following markup, which will change the color of the control to blue and the Foreground color to yellow when the mouse is over the surface: <ControlTemplate x:Key="RoundButtonTemplate" TargetType="Button" > <Grid x:Name="controlLayout"> <Ellipse x:Name="buttonSurface" Fill="LightBlue" /> <Label x:Name="buttonCaption" Content="OK!" FontSize="20" FontWeight="Bold" HorizontalAlignment="Center" VerticalAlignment="Center" /> </Grid> <ControlTemplate.Triggers> <Trigger Property = "IsMouseOver" Value = "True">

If you want to completely empty a cache table, pass * as the $cid and set the $wildcard parameter to TRUE. This example clears the entire cache_foo table: cache_clear_all('*', 'cache_foo', TRUE); Clear any expirable entries from the page and block caches (i.e., the cache_page and cache_block tables): cache_clear_all();

<Setter TargetName = "buttonSurface" Property = "Fill" Value = "Blue"/> <Setter TargetName = "buttonCaption" Property = "Foreground" Value = "Yellow"/> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> If you run the program yet again, you should find the color does toggle based on whether or not the mouse is within the Ellipse area. Here is another trigger, which will shrink the size of the Grid (and therefore all child elements) when the control is pressed via the mouse. Add this to your <ControlTemplate.Triggers> collection: <Trigger Property = "IsPressed" Value="True"> <Setter TargetName="controlLayout" Property="RenderTransformOrigin" Value="0.5,0.5"/> <Setter TargetName="controlLayout" Property="RenderTransform"> <Setter.Value> <ScaleTransform ScaleX="0.8" ScaleY="0.8"/> </Setter.Value> </Setter> </Trigger> At this point, you have a custom template with a few visual cues incorporated using WPF triggers. As you will see in the next (and final) example of this chapter, .NET 4.0 introduces an alternative way to incorporate visual cues using the Visual State Manager. Before you get to that point, let s talk about the role of the {TemplateBinding} markup extension and the ContentPresenter class.

Your template can only be applied to Button controls, and therefore it would stand to reason that you could set properties on the <Button> element that will cause the template to render itself in a unique manner. For example, right now, the Fill property of the Ellipse is hard coded to be blue and the Content of the Label is always set to the string value OK . Of course, you might want buttons of different colors and text values, so you might try to define the following buttons in your main window: <StackPanel> <Button x:Name="myButton" Width="100" Height="100" Background="Red" Content="Howdy!" Click="myButton_Click" Template="{StaticResource RoundButtonTemplate}" /> <Button x:Name="myButton2" Width="100" Height="100" Background="LightGreen" Content="Cancel!" Template="{StaticResource RoundButtonTemplate}" /> <Button x:Name="myButton3" Width="100" Height="100" Background="Yellow" Content="Format" Template="{StaticResource RoundButtonTemplate}" /> </StackPanel> However, regardless of the fact that each Button is setting a unique Background and Content value, you still end up with three blue buttons which contain the text OK . The problem is that the properties

of the control using the template (Button) have properties which do not match identically with the items on the template (such as the Fill property of the Ellipse). As well, although the Label does have a Content property, the value defined in the <Button> scope is not automatically routed to the internal child of the template. You can solve these issues by using the {TemplateBinding} markup extension when you build your template. This allows you to capture property settings defined by the control using your template and use them to set values in the template itself. Here is a reworked version of RoundButtonTemplate, which now uses this markup extension to map the Background property of the Button to the Fill property of the Ellipse; it also makes sure the Content of the Button is indeed passed to the Content property of the Label: <ControlTemplate x:Key="RoundButtonTemplate" TargetType="Button"> <Grid x:Name="controlLayout"> <Ellipse x:Name="buttonSurface" Fill="{TemplateBinding Background}"/> <Label x:Name="buttonCaption" Content="{TemplateBinding Content}" FontSize="20" FontWeight="Bold" HorizontalAlignment="Center" VerticalAlignment="Center" /> </Grid> <ControlTemplate.Triggers> ... </ControlTemplate.Triggers> </ControlTemplate> With this update, you can now create buttons of various colors and textual values (Figure 31-13).

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