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scroll_bar->bubble
scroll_bar ->bubble: length=int, start=int, view=int
The three parameters scroll_bar<-length, scroll_bar<-start and scroll_bar<-view tell the scrollbar which part of the object scrolled is currently in the window:
scroll_bar->length Total size of the object
scroll_bar->start Start of the visible part
scroll_bar->view Size of the visible part

The method scroll_bar->bubble allows the user to change all three parameters with one message. See also scroll_bar->compute.

See also
class scroll_bar
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