Gadget geometry
Factor handbook > UI framework > Building user interfaces

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The gadget class inherits from the rect class, and thus all gadgets have a bounding box:
Rectangles

Word for converting from a child gadget's co-ordinate system to a parent's:
relative-loc ( fromgadget togadget -- loc )

screen-loc ( gadget -- loc )


Hit testing:
pick-up ( point gadget -- child/f )

children-on ( rect gadget -- seq )