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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.