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Reference for unit 'InterfaceBase' (#lcl)

TWidgetSet.SetBkMode

Sets the background mix mode (transparency) of an device context.

Declaration

Source position: winapih.inc line 240

public function TWidgetSet.SetBkMode(

DC: HDC;

bkMode: Integer

):Integer; virtual;

`DC`		The device context.
`bkMode`		The new background mode.

The previous background mode, zero on failure.

The background mode specifies the handling of non-solid painting objects, like text, hatched brushes or dotted pens.

OPAQUE mode fills the affected painting area with the background color before painting the foreground.
TRANSPARENT mode leaves the background unchanged.

Version 4.0

Generated 2025-05-03