Added options to limit outer scroll space #34
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This PR fixes #33
Basically it allows the user to configure two additional boolean options scrollWhenOutsideX and scrollWhenOutsideY to limit which pointer position outside of the scrollable element is permitted to scroll it.
By setting first scrollWhenOutsideX and secondly scrollWhenOutsideY to false, the limitations then look like this
where only dragging in the green zones is able to scroll in the div. This stays in opposition to configuring setting just scrollWhenOutside, where the complete rectangle around the div is permitted to scroll in that div.
This solves the problem of two scrollable divs next to each other while dragging and drag-scrolling between them.
Without the fix, if one drags from 1 to the orange areas in 2, it scrolls both of them because the outside scrollable area of 1 isn't confined to its "natural" axis. With the fix, by specifying eg.
{ scrollWhenOutsideX: false, scrollWhenOutsideY: true }
the div nr. 1 can be only scrolled by dragging to one of the yellow areas.
Note, that I leave the scrollWhenOutside option there for compatiblity reasons and all those 3 are complementary.