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Triggers can also be designed in such a way that the defined <Setter> elements will be applied when multiple conditions are true (similar to building an if statement for multiple conditions). Let s say we want to set the background of a TextBox to Yellow only if it has the active focus and the mouse is hovering within its boundaries. To do so, we can make use of the <MultiTrigger> element to define each condition: <!-- The default style for all text boxes --> <Style TargetType="TextBox"> <Setter Property = "FontSize" Value ="14"/> <Setter Property = "Width" Value = "100"/> <Setter Property = "Height" Value = "30"/>

<Setter Property = "BorderThickness" Value = "5"/> <Setter Property = "BorderBrush" Value = "Red"/> <Setter Property = "FontStyle" Value = "Italic"/> <!-- The following setter will only be applied when the text box is in focus AND the mouse is over the text box. --> <Style.Triggers> <MultiTrigger> <MultiTrigger.Conditions> <Condition Property = "IsFocused" Value = "True"/> <Condition Property = "IsMouseOver" Value = "True"/> </MultiTrigger.Conditions> <Setter Property = "Background" Value = "Yellow"/> </MultiTrigger> </Style.Triggers> </Style>

Unchecking the boxes for Cache pages and Cache blocks is useful when debugging a site, as it allows you to see your changes without having to clear cache to reload elements that have changed. Generally, you will want to enable caching.

Styles can also incorporate triggers that kick off an animation sequence. Here is one final style that, when applied to Button controls, will cause the control to grow and shrink in size when the mouse is inside the button s surface area: <!-- The growing button style! --> <Style x:Key = "GrowingButtonStyle" TargetType="Button"> <Setter Property = "Height" Value = "40"/> <Setter Property = "Width" Value = "100"/> <Style.Triggers> <Trigger Property = "IsMouseOver" Value = "True"> <Trigger.EnterActions> <BeginStoryboard> <Storyboard TargetProperty = "Height"> <DoubleAnimation From = "40" To = "200" Duration = "0:0:2" AutoReverse="True"/> </Storyboard> </BeginStoryboard> </Trigger.EnterActions> </Trigger> </Style.Triggers> </Style> Here, our triggers collection is on the lookout for the IsMouseOver property to return true. When this occurs, we define a <Trigger.EnterActions> element to execute a simple storyboard that forces the button to grow to a Height value of 200 (and then return to a Height of 40) over 2 seconds. If you wish to perform other property changes, you could also define a <Trigger.ExitActions> scope to define any custom actions to take when IsMouseOver is false.

Recall that a style can be applied at runtime as well. This can be helpful if you want to let end users choose how their UI looks and feels, or if you need to enforce a look and feel based on security settings (e.g., the DisableAllButton style) or what have you. During this project, you have defined a number of styles, many of which can apply to Button controls. So, let s retool the UI of our main window to allow the user to pick from some of these styles by selecting names in a ListBox. Based on the user s selection, we will apply the appropriate style. Here is the new (and final) markup for the <Window> element: <Window x:Class="WpfStyles.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="350" Title="A Window with Style!" Width="525" WindowStartupLocation="CenterScreen"> <DockPanel > <StackPanel Orientation="Horizontal" DockPanel.Dock="Top"> <Label Content="Please Pick a Style for this Button" Height="50"/> <ListBox x:Name ="lstStyles" Height ="80" Width ="150" Background="LightBlue" SelectionChanged ="comboStyles_Changed" /> </StackPanel> <Button x:Name="btnStyle" Height="40" Width="100" Content="OK!"/> </DockPanel> </Window> The ListBox control (named lstStyles) will be filled dynamically within the window s constructor like so: public MainWindow() { InitializeComponent(); // Fill the list box with all the Button // styles. lstStyles.Items.Add("GrowingButtonStyle"); lstStyles.Items.Add("TiltButton"); lstStyles.Items.Add("BigGreenButton"); lstStyles.Items.Add("BasicControlStyle"); } The final task is to handle the SelectionChanged event in the related code file. Notice in the following code how we are able to extract the current resource by name, using the inherited TryFindResource() method: private void comboStyles_Changed(object sender, SelectionChangedEventArgs e) { // Get the selected style name from the list box. Style currStyle = (Style) TryFindResource(lstStyles.SelectedValue);

Note Even with page caching disabled, Drupal will still cache user menus, filter content, the theme registry, the database schema, and system variables. These component-level caches cannot be disabled.

if (currStyle != null) { // Set the style of the button type. this.btnStyle.Style = currStyle; } } When you run this application, you can pick from one of these four button styles on the fly. Figure 30-19 shows our completed application.