49.10 KeyTrigger

The trigger keyframe (KeyTrigger) allows a method on a view to be called when the animation reaches a specified frame position within the animation timeline. This also takes into consideration the direction of the animations. For example, different methods can be called depending on whether the animation is running forward or backward. Consider a button that is to be made visible when the animation moves beyond 20% of the timeline. The KeyTrigger would be implemented within the KeyFrameSet of the Transition element as follows using the onPositiveCross property:

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    <KeyFrameSet>

           <KeyTrigger

               motion:framePosition="20"

               motion:onPositiveCross="show"

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