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The following types of positioner exist:
FL_NORMAL_POSITIONER
Cross-hair inside a box.
FL_OVERLAY_POSITIONER
Cross-hair inside a transparent box.
FL_INVISIBLE_POSITIONER
Completely invisible positioner, to be used just for the side effect of obtaining a position (typically an object is below below it that otherwise would receive user events).
Note that for exatly positioning a FL_OVERLAY_POSITIONER
or
FL_INVISIBLE_POSITIONER
over another object you have to
take account of the (absolute value of the) border widths of both the
underlying obkject and the positioner.