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Reference for unit 'InterfaceBase' (#lcl)

TWidgetSet.ExtSelectClipRGN

Combines the passed Region with the current clipping region.

Declaration

Source position: winapih.inc line 101

public function TWidgetSet.ExtSelectClipRGN(

dc: HDC;

rgn: HRGN;

Mode: LongInt

):Integer; virtual;

`rgn`		The region to combine with.
`Mode`		How the regions are combined.

The type of the resulting clipping region.

The Mode can be one of:

RGN_AND: All points which are in both regions.
RGN_COPY: An exact copy of the source region, same as SelectClipRGN.
RGN_DIFF: All points which are in the Clipping Region but but not in the Source. (Clip - RGN).
RGN_OR: All points which are in either the Clip Region or in the Source. (Clip + RGN).
RGN_XOR: All points which are in either the Clip Region or in the Source, but not in both.

Version 4.0

Generated 2025-05-03