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Within that, there s a set of properties defined for the Border element, most of which are pretty self-explanatory. Notice that for a background, the Border element uses the ListBoxGradient brush that you defined a moment ago. Within the Border element is a ScrollViewer element. This element is what gives the ListBox a horizontal scroll bar, but not a vertical one. Within the ScrollViewer is another StackPanel element this is where you ll keep the images of the presidents. The IsItemsHost property indicates that this StackPanel will hold other objects (you ll see how this works in a bit), and the Orientation and HorizontalAlignment properties simply orient the StackPanel inside the ScrollViewer. Add the following Style within the Window.Resources element, right after the LinearGradiantBrush:
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<Style x:Key="SpecialListStyle" TargetType="{x:Type ListBox}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type ListBox}" > <Border BorderBrush="Gray" BorderThickness="1" CornerRadius="6" Background="{DynamicResource ListBoxGradient}" > <ScrollViewer VerticalScrollBarVisibility="Disabled" HorizontalScrollBarVisibility="Visible"> <StackPanel IsItemsHost="True" Orientation="Horizontal" HorizontalAlignment="Left" /> </ScrollViewer> </Border> </ControlTemplate> </Setter.Value> </Setter> </Style>
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Triggers and animations
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The style for the ListBox that you just created contains a StackPanel that contains items. The next thing you ll do is define the style for these items. The items, you ll recall, are the images of the presidents that you re displaying. We mentioned that these images will change appearance when the user moves the mouse over them. You saw earlier in the chapter how to interact with the user s mouse movements you ll need to define some triggers. The Triggers will reside in the Style, rather than being attached to a specific instance of a control. This style begins by setting its target type, as the last style did (ListBoxItems), and three properties: MaxHeight, MinHeight, and Opacity. The MaxHeight and MinHeight properties have the same value, which means that the size of the items is fixed, but you ll be able to change that dynamically, as you ll see shortly. The Opacity of a control is defined as a value between 0 and 1:
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19: Windows Presentation Foundation
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<Style x:Key="SpecialListItem" TargetType="{x:Type ListBoxItem}"> <Setter Property="MaxHeight" Value="75" /> <Setter Property="MinHeight" Value="75" /> <Setter Property="Opacity" Value=".75" />
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The style then sets a couple of triggers. As with the triggers you saw earlier in the chapter, these triggers associate an EventTrigger with a RoutedEvent. Specifically, the first trigger uses the MouseEnter event that you saw in an earlier example:
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<EventTrigger RoutedEvent="Mouse.MouseEnter">
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In this case, the event will be kicked off when the mouse enters the object that is associated with this EventTrigger (that object will be the ListBox item), as opposed to targeting a specific control as you did earlier in the chapter. Within that EventTrigger you defined an EventTrigger.Actions element. In this case, the action is BeginStoryBoard, and there is a single, unnamed Storyboard:
<EventTrigger RoutedEvent="Mouse.MouseEnter"> <EventTrigger.Actions> <BeginStoryboard> <Storyboard> <DoubleAnimation Duration="0:0:0.2" Storyboard.TargetProperty="MaxHeight" To="85" /> <DoubleAnimation Duration="0:0:0.2" Storyboard.TargetProperty="Opacity" To="1.0" /> </Storyboard> </BeginStoryboard> </EventTrigger.Actions> </EventTrigger>
The action is inside the storyboard, where you ll find two animations. These are DoubleAnimation elements, because you re changing two properties with double values. These two animations are defined to have a duration of 2/10 of a second. The TargetProperty refers to the property of the object to be animated (that is, the ListBox item) in the first case, the height of the ListBox item, which will be animated to a height of 85 (from a starting point of 75). The second animation will change the opacity from its starting point of .75 to 1 (making it appear to brighten). The other trigger is for the MouseLeave event, and just reverses the effects. Here s the XAML for the entire style; add this to the Windows.Resources section:
<Style x:Key="SpecialListItem" TargetType="{x:Type ListBoxItem}"> <Setter Property="MaxHeight" Value="75" /> <Setter Property="MinHeight" Value="75" /> <Setter Property="Opacity" Value=".75" /> <Style.Triggers> <EventTrigger RoutedEvent="Mouse.MouseEnter"> <EventTrigger.Actions> <BeginStoryboard> <Storyboard> <DoubleAnimation Duration="0:0:0.2"
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