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The state animations are the most interesting part of the control template. They re the ingredients that provide the flipping behavior. They re also the details that are most likely to be changed if a developer creates a custom template for the FlipPanel. To define state groups, you must add the VisualStateManager.VisualStateGroups element in the root element of your control template, as shown here: <ControlTemplate TargetType="{x:Type local:FlipPanel}"> <Grid> <VisualStateManager.VisualStateGroups> ... </VisualStateManager.VisualStateGroups> ... </Grid> </ControlTemplate>

This layout panel holds both the visuals for your control and the VisualStateManager, which is invisible. The VisualStateManager defines storyboards with the animations that the control can use at the appropriate time to alter its appearance.

You are now ready to test the solution: 1. Press F5 to start the website. You will be presented with the screen shown in Figure 15-11.

WPF and Silverlight make extensive use of the Command design pattern. Figure 3 9 shows the classes and interfaces involved in a typical Command pattern scenario.

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Inside the VisualStateGroups element, you can create the state groups using appropriately named VisualStateGroup elements. Inside each VisualStateGroup, you add a VisualState element for each visual state. In the case of the FlipPanel, there is one group that contains two visual states: <VisualStateManager.VisualStateGroups> <VisualStateGroup x:Name="ViewStates"> <VisualState x:Name="Normal"> ... </VisualState> </VisualStateGroup> <VisualStateGroup x:Name="FocusStates"> <VisualState x:Name="Flipped"> ... </VisualState> </VisualStateGroup> </VisualStateManager.VisualStateGroups> Each state corresponds to a storyboard with one or more animations. If these storyboards exist, they re triggered at the appropriate times. (If they don t, the control should degrade gracefully, without raising an error.)

In the default control template, the animations use a simple fade to change from one content region to the other and use a rotation to flip the ToggleButton arrow around to point in the other direction. Here s the markup that takes care of both tasks: <VisualState x:Name="Normal"> <Storyboard> <DoubleAnimation Storyboard.TargetName="BackContent" Storyboard.TargetProperty="Opacity" To="0" Duration="0" ></DoubleAnimation> </Storyboard> </VisualState> <VisualState x:Name="Flipped"> <Storyboard> <DoubleAnimation Storyboard.TargetName="FlipButtonTransform" Storyboard.TargetProperty="Angle" To="90" Duration="0"></DoubleAnimation> <DoubleAnimation Storyboard.TargetName="FrontContent" Storyboard.TargetProperty="Opacity" To="0" Duration="0"></DoubleAnimation> </Storyboard> </VisualState> You ll notice that the visual states set the animation duration to 0, which means the animation applies its effect instantaneously. This might seem a little odd after all, don t you need a more gradual change to notice the animated effect In fact, this design is perfectly correct, because visual states are meant to indicate how the control looks while it s in the appropriate state. For example, a flipped panel simply shows its background content while in the flipped state. The flipping process is a transition that happens just before the FlipControl enters the flipped state, not part of the state itself. (This distinction between states and transitions is important, because some controls do have animations that run during a state. For example, think of the button example from 17 that featured the pulsing background color while the mouse hovers over it.)

A transition is an animation that starts from the current state and ends at the new state. One of the advantages of the transition model is that you don t need to create the storyboard for this animation. For example, if you add the markup shown here, WPF creates a 0.7-second animation to change the opacity of the FlipPanel, creating the pleasant fade effect you want: <VisualStateGroup x:Name="ViewStates"> <VisualStateGroup.Transitions> <VisualTransition GeneratedDuration="0:0:0.7"></VisualTransition> </VisualStateGroup.Transitions> <VisualState x:Name="Normal"> ... </VisualState> <VisualState x:Name="Flipped"> ... </VisualState> </VisualStateGroup>

Figure 15-11. Entering the ZIP code 2. Enter a U.S. ZIP code in the text box, and click the Next button.

Transitions apply to state groups When you define a transition, you must add it to the VisualStateGroupTransitions collection This example uses the simplest sort of transition: a default transition, which applies to all the state changes for that group A default transition is convenient, but it s a one-size-fits-all solution that s not always suitable For example, you may want the FlipPanel to transition at different speeds depending on which state its entering To set this up, you need to define multiple transitions, and you need to set the To property to specify when the transition will come into effect For example, if you have these transitions <VisualStateGroupTransitions> <VisualTransition To="Flipped" GeneratedDuration="0:0:05" /> <VisualTransition To="Normal" GeneratedDuration="0:0:01" /> </VisualStateGroupTransitions> the FlipPanel will switch to the Flipped state in 05 seconds, and it will enter the Normal state in 01 seconds.

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