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{ // Hookup event handlers thisMouseLeftButtonDown += new MouseButtonEventHandler(ButtonDown); thisMouseLeftButtonUp += new MouseButtonEventHandler(ButtonUp); }
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// // Define VisualStateManager states // private const string Normal = "Normal"; private const string Pressed = "Pressed";
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// // Define transitions by calling GoToState // void ButtonDown(object sender, MouseButtonEventA rgs e) { VisualStateManagerGoToState(this, Pressed, true /* transitions */); } void ButtonUp(object sender, MouseButtonEventA rgs e) { VisualStateManagerGoToState(this, Normal, true /* transitions */); } }
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In this example, the transition only applies the state group that tracks normal or pressed state, but the state group that de nes the focus state does not change In particular, if the button had a focus rectangle, it would be unmodi ed by this transition With this de nition of a custom control, you can now create a template and de ne the visual state manager transitions the same way that you did with a built-in Silverlight control:
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<app:SimpleButton Width="100" Height="50" Content="Hello World"> <app:SimpleButtonTemplate> <ControlTemplate> <Grid> <vsm:VisualStateManagerVisualStateGroups> <vsm:VisualStateGroup x:Name="CommonStates"> <vsm:VisualState x:Name="Normal"/> <vsm:VisualState x:Name="Pressed">
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<Storyboard> <ColorA nimation Duration="00:00:00" StoryboardTargetName="ButtonBorderBrush" StoryboardTargetProperty="Color" To="Black" /> </Storyboard> </vsm:VisualState> </vsm:VisualStateGroup> </vsm:VisualStateManagerVisualStateGroups>
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<Border Background="White" BorderThickness="5"> <BorderBorderBrush> <SolidColorBrush x:Name="ButtonBorderBrush" Color="LightGray" /> </BorderBorderBrush> <ContentPresenter HorizontalA lignment="Center" VerticalA lignment="Center" x:Name="contentPresenter" Content="{TemplateBinding Content}" /> </Border> </Grid> </ControlTemplate> </app:SimpleButtonTemplate> </app:SimpleButton>
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The two components to the Silverlight control model include instantiating the elements of the control as de ned by the templates and managing the state transitions with the visual state manager This section describes how these components work under the hood
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Control Instantiation When you instantiate a UserControl element, the XAML is usually parsed immediately and all objects that make up your control are created A Control element derived class keeps some components as XAML strings so that they can be instantiated later In particular, the templates are kept as strings and expanded during the layout system measure pass, and the
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visual state manager keeps the storyboards as strings and instantiates them when you call GoToState for the rst time on that state Control templates use deferred instantiation as a performance optimization In particular, if your layout container decides that there is not enough visual space for all the children to t in the container, there is no reason to apply template expansion to those children that do not t This deferred instantiation is visible to your application because your constructors and events do not re until your control is determined visible by some layout container This optimization bene ts the performance of long lists
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Control templates conceptually copy and paste your XAML for each instance of a control For this reason, you should keep control templates as small as possible to improve your application load times Furthermore, custom control types in your template often instantiate slower than built-in types For frequently expanded templates, you should use mostly built-in types to improve application load times
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The visual state manager defers the instantiation of your storyboards to optimize your application load time In general, your application initially displays most controls in their default state and only requires the additional states later when you interact with the controls To minimize load times, your storyboard animations are only instantiated when you start interacting with those controls
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The Visual State Manager Algorithm The key function in the visual state manager is the implementation of the VisualStateManagerGoToState method When you call GoToState, the visual state manager does the following:
1 Finds the visual state group for the target 2 Does no further work if the target state and the source state are the same
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3 Creates the storyboard for the new state As a performance optimization, Silverlight does not parse storyboard XAML in visual state groups until they are rst used 4 Starts the new animation and stops the old one if there is no custom animation 5 Starts the custom animation and stops the currently playing one if there is a custom animation 6 Fires visual state manager state events for those animations that have completed 7 Sets the current state to the target state You can implement your own VisualStateManager with your own transition rules by deriving from VisualStateManager and setting the VisualStateManagerCustomVisualStateManager property to an instance of your custom class