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17.4.2 Positioner Types

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.