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</Border> </ControlTemplate> </Button.Template> </Button>
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This template is now looking like a candidate for reuse we might want to apply this to lots of different buttons. The usual way to do this is to wrap it in a style.
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A style is an object that defines a set of property values for a particular type of element. Since elements appearances are defined entirely by their properties Template is a property, remember this means a style can define as much of a control s appearance as you like. It could be as simple as just setting some basic properties such as FontFamily and Background, or it could go as far as defining a template along with property values for every property that affects appearance. Example 20-22 sits between these two extremes it puts the template from Example 20-21 into a style, along with settings for a few other properties.
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<UserControl.Resources> <Style x:Key="buttonStyle" TargetType="Button"> <Setter Property="Background" Value="LightBlue" /> <Setter Property="BorderBrush" Value="DarkBlue" /> <Setter Property="BorderThickness" Value="3" /> <Setter Property="FontSize" Value="20" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="Button"> <Border Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" CornerRadius="10"> <ContentPresenter Margin="{TemplateBinding Padding}" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding HorizontalContentAlignment}" /> </Border> </ControlTemplate> </Setter.Value> </Setter>
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</Style> </UserControl.Resources>
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Notice that the style is inside a Resources section remember that all elements have a Resources property, which is a dictionary that can hold useful objects such as styles. We can then apply the style to an element like so:
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<Button Content="OK" Style="{StaticResource buttonStyle}" />
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This will pick up all the properties from the style. Again notice the use of braces in the attribute value this signifies that we re using a markup extension, which is a type that works out at runtime how to set the property s real value. We already saw the TemplateBinding markup extension, and now we re using StaticResource, which looks up an entry in a resource dictionary.
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Unlike the Template property, which is available only on controls, the Style property is defined by FrameworkElement, so it s available on all kinds of elements.
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By the way, an element that uses a style is free to override any of the properties the style sets, as shown in Example 20-23.
<Button Content="OK" Style="{StaticResource buttonStyle}" Background="Yellow" />
Properties set directly on the element override properties from the style. This is why it s important to use TemplateBinding in templates. The style in Example 20-22 sets a default Background color of LightBlue, and the template then picks that up with a TemplateBinding, which means that when Example 20-23 sets the background to yellow, the control template picks up the new color that wouldn t have happened if the light blue background had been baked directly into the template. So the combination of styles, templates, and template bindings makes it possible to create a complete look for a control while retaining the flexibility to change individual aspects of that look on a control-by-control basis. There s one problem with our button style: it s rather static. It doesn t offer any visible response to mouse input. Most controls light up when the mouse cursor moves over them if they are able to respond to input, and the fact that our control doesn t is likely to make users think either that the application has crashed or that the button is merely decorative. We need to fix this.
The Visual State Manager
A control template can include a set of instructions describing how its appearance should change as the control changes its state. These are added with an attachable property called VisualStateGroups, defined by the VisualStateManager class. Example 20-24 shows a modified version of the template that adds this attachable property.
<ControlTemplate TargetType="Button"> <Border x:Name="background" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" CornerRadius="10"> <VisualStateManager.VisualStateGroups> <VisualStateGroup x:Name="CommonStates"> <VisualState x:Name="MouseOver"> <Storyboard> <ColorAnimation Storyboard.TargetName="background" Storyboard.TargetProperty="(Border.Background). (SolidColorBrush.Color)" To="Red" Duration="0:0:0.5" /> </Storyboard> </VisualState> <VisualState x:Name="Normal"> <Storyboard> <ColorAnimation Storyboard.TargetName="background" Storyboard.TargetProperty="(Border.Background). (SolidColorBrush.Color)" Duration="0:0:0.5" /> </Storyboard> </VisualState> </VisualStateGroup> </VisualStateManager.VisualStateGroups> <ContentPresenter Margin="{TemplateBinding Padding}" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding HorizontalContentAlignment}" /> </Border> </ControlTemplate>
This class was originally unique to Silverlight. It was added later to WPF in .NET 4. WPF has an older mechanism called triggers that can also be used to get the same results. Triggers are more complex, but are also more powerful. Silverlight does not currently offer them.
The VisualStateGroups property contains one or more VisualStateGroup elements the groups you can add in here are determined by the control. Button defines two groups: CommonStates and FocusStates. Each group defines some aspect of the control s state that can vary independently of the other groups. For example, FocusStates defines a Focused and an Unfocused state based on whether the button has the keyboard focus. The CommonStates group defines Normal, MouseOver, Pressed, and Disabled states the control can be in only one of those four states at any time, but whether it s focused is independent of whether the mouse cursor is over it, hence the use of different groups. (The groups aren t wholly independent a disabled button cannot acquire the focus, for example. But you see multiple state groups anytime there s at least some degree of independence.) Example 20-24 defines behaviors for when the button enters the MouseOver state and the Normal state, with a VisualState for each. These define the animations to run when the state is entered. In this example, both animations target the Border element s Background. The first animation fades the background to red when the mouse enters, and the second animates it back to its original color when the state returns to normal. (The absence of a To property on the second animation causes the property to animate back to its base value.)
Visual state transitions typically end up being very verbose the only way to modify properties is with animations, even if you want the changes to happen instantaneously, so even a simple change requires a lot of markup. And you will typically want to provide transitions for all of the states. In practice, you would normally create them interactively in Expression Blend, which will add all the necessary Xaml for you.
So far, everything we ve looked at has been strictly about the visible bits, but any real application needs to connect the frontend up to real data. To help with this, WPF and Silverlight offer data binding.
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