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User:HimanshiKalra/BlenderDocs
Documentation for reference
View2D is a way of describing viewport in 2D.
Commonly used with ARegion (area region or active region).
Used for view panning and scrolling purposes.
The scrolling operations are present in view2D_ops.c file.
Similar to other operations like subdivide in Edit Mode.
Scroll by a length of one "page" happens when we click on an empty space outside the size of the scrollbar. The scrollbar moves down by a fixed amount called a page.
Lukas Tonne worked on a similar Edge Panning structure.