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Reference for unit 'InterfaceBase' (#lcl)

TWidgetSet.ScrollWindowEx

Scrolls the content of a window, by a number of pixels.

Declaration

Source position: winapih.inc line 233

public function TWidgetSet.ScrollWindowEx(

hWnd: HWND;

prcScroll: PRect;

prcClip: PRect;

hrgnUpdate: HRGN;

prcUpdate: PRect;

flags: UINT

):Boolean; virtual;

`hWnd`		The window handle.
`dx`		Horizontal distance (positive to scroll right).
`dy`		Vertical distance (positive to scroll down).
`prcScroll`		The part of the window, that is to be scrolled. Nil means the entire client area.
`prcClip`		Pixels falling outside this rectangle are lost. Nil means the entire client area.
`hrgnUpdate`		The invalidated parts of the window are added to this region (can be zero).
`prcUpdate`		Receives the boundary of the invalidated part of the window (can be Nil).
`flags`		Control flags.

False on failure.

The following flags values are defined:

SW_ERASE: When used with SW_INVALIDATE, sends WM_ERASEBKGND messages for the invalidated parts of the window.
SW_INVALIDATE: Invalidates the resulting hrgnUpdate region.
SW_SCROLLCHILDREN: Also scrolls child windows within the scroll rect. Beware: also scrolls parts of the child windows!
SW_SMOOTHSCROLL: set HIWORD of flags to the time for the scrolling operation.

Version 4.0

Generated 2025-05-03