VALUE PRECEDENCE in VB.NET

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VALUE PRECEDENCE
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Dependency properties obtain their value from a variety of inputs. What follows is the order the Silverlight property system uses when assigning the runtime values of dependency properties, with the highest precedence listed first:
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Active or hold animations Animations will operate on the base value for the dependency property, determined by evaluating the precedence for other inputs. In order for an animation to have any effect, it must be highest in precedence. Animations may operate on a single dependency property from multiple levels of precedence (for example, an animation defined in the control template and an animation defined locally). The value typically results from the composite of all animations, depending on the type being animated. Local value Local values are specified directly in the markup and are accessed via the CLR property wrappers for the dependency property. Because local values are higher in precedence than styles and templates, they re capable of overriding values such as the font style or foreground color defined in the default style for a control. Templated properties Used specifically for elements created within a control or data template, their value is taken from the template itself. Style setters These are values set in a style in your application via resources defined in or merged into the UserControl or application resource dictionaries. We ll explore styles in chapter 23. Default value This is the value provided or assigned when the dependency property was first created. If no default value was provided, normal CLR defaults typically apply.
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The strict precedence rules allow you to depend on behaviors within Silverlight, such as being able to override elements of a style by setting them as local values from within the element itself. In listing 2.9, the foreground of the button will be red as set in the local value and not black as set in the style. The local value has a higher precedence than the applied style.
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Listing 2.9 Dependency property precedence rules in practice
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<UserControl x:Class="Xaml08.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="400" Height="300">
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XAML basics
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<UserControl.Resources> <Style x:Key="ButtonStyle" TargetType="Button"> <Setter Property="Foreground" Value="Black" /> <Setter Property="FontSize" Value="24" /> </Style> </UserControl.Resources> <Grid x:Name="LayoutRoot"> <Button Content="Local Values at Work" Style="{StaticResource ButtonStyle}" Foreground="Red" /> </Grid> </UserControl>
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The Style tag in UserControl.Resources is a reusable asset that sets some key properties for our button. We ll cover creating dependency properties in chapter 24 when we create our own controls. For the purposes of this chapter, it s sufficient to understand that the majority of the properties you ll refer to in XAML are dependency properties. One type of dependency property that has a slightly odd appearance is an attached property.
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Attached properties
Attached properties are a specialized type of dependency property that is immediately recognizable in markup due to the TypeName.AttachedPropertyName syntax. For example, Canvas.Left is an attached property defined by the Canvas type. What makes attached properties interesting is that they re not defined by the type you use them with; instead, they re defined by another type in a potentially different class hierarchy. Attached properties allow flexibility when defining classes because the classes don t need to take into account every possible scenario in which they ll be used and define properties for those scenarios. Layout is a great example of this. The flexibility of the Silverlight layout system allows you to create new panels that may never have been implemented in other technologies for example, a panel that lays elements out by degrees and levels in a circular or radial fashion versus something like the built-in Canvas that lays elements out by Left and Top positions. Rather than have all elements define Left, Top, Level, and Degrees properties (as well as GridRow and GridColumn properties for grids), we can use attached properties. The buttons in listing 2.10, for example, are contained in panels that have greatly differing layout algorithms, requiring different positioning information. In this case, we ll show a fictional RadialPanel in use.
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