get-scroll-page

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`get-scroll-page`

Get the current page step size of a scrollbar. The result is undefined if the scrollbar is not active or it is managing.

(send a-wx:canvas get-scroll-page which) -> small integer
which : small integer
The which argument is either wx:const-horizontal or wx:const-vertical, indicating that the page step size of the horizontal or vertical scrollbar should be returned, repsectively.