A
timeline may come to an end before its parent finishes. Or it may have no
parent. In this case, the timeline enters its so-called ‘fill period’ – the
time between the end of its inherent duration and the end of its parent
timeline. (Or the time at which the UI closes if the timeline has no parent.) |
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There
are two behaviors a timeline can exhibit in its fill period. It can either
deactivate, in which case the property will revert to the value it had before
the animation started. Or it can ‘hold’ – meaning that the animation’s final
value continues to apply. (And if further animations target the same
property, their effects will compose as discussed earlier.) The hold
behaviour is the default. To deactivate at the end of the timeline’s
duration, set the FillBehavior property to Deactivate. |