Change Visual State and use transitions or not based on Dependency Property
I have one control, that I sometimes want to animate a state transition and sometimes I don't.
At the moment I have something like so:
<Grid>
<Interactivity:Inte开发者_C百科raction.Behaviors>
<ic:DataStateBehavior Binding="{Binding Direction}" Value="Up" TrueState="Up_Direction" />
</Interactivity:Interaction.Behaviors>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="AnimatedStates">
<VisualStateGroup.Transitions>
<VisualTransition x:Name="transition" GeneratedDuration="0:0:1">
<VisualTransition.GeneratedEasingFunction>
<ElasticEase .../>
</VisualTransition.GeneratedEasingFunction>
</VisualTransition>
</VisualStateGroup.Transitions>
<VisualState x:Name="Up_Direction" >
<Storyboard>
<DoubleAnimation Duration="0" To="0" Storyboard.TargetProperty="(UIElement.RenderTransform).(RotateTransform.Angle)"
Storyboard.TargetName="pathArrow" />
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Path x:Name="pathArrow" ...>
<Path.RenderTransform>
<RotateTransform Angle="90" />
</Path.RenderTransform>
</Path>
</Grid>
This works great, but I want to have a UseTransitions dependency property that controls whether that state transitions are animated or not.
I've tried a few things like setting the GeneratedDuration to 0 on the UseTransitions property changed handler, but it seems to get set after the state has already changed, so has no effect.
I also tried the GoToStateAction with a DataTrigger but they only seem to get triggered on a change and the initial value of the DataContext doesn't set the state correctly.
I've thought about having a ValueConverter on the DataStateBehaviour that evaluates the UseTransition property and triggers different states, but that seems like a really ugly solution.
Anyone have an elegant solution?
精彩评论