Adds an event handler that runs when a gallery's current item changes.
A gallery's current item changes through playing or certain user interactions.
Notes:
The onCurrentItemChanged()
function is supported by galleries where
the hasCurrentItem
capability is true
.
If you change the gallery's type
to one that doesn't support hasCurrentItem
and you try to use it, your
code may no longer function correctly.
handler(event: GalleryItemChangedEvent): void The name of the function or the function expression to run when the gallery's current item changes.