WM_SIZING

The WM_SIZING message is sent to a window that the user is resizing. By processing this message, an application can monitor the size and position of the drag rectangle and, if needed, change its size or position.

fwSide = wParam;         // edge of window being sized 
lprc = (LPRECT) lParam;  // screen coordinates of drag rectangle 
 

Parameters

fwSide

Value of wParam. Indicates which edge of the window is being sized. This parameter can be a combination of the following values:

Value	Meaning
WMSZ_BOTTOM	Bottom edge
WMSZ_BOTTOMLEFT	Bottom-left corner
WMSZ_BOTTOMRIGHT	Bottom-right corner
WMSZ_LEFT	Left edge
WMSZ_RIGHT	Right edge
WMSZ_TOP	Top edge
WMSZ_TOPLEFT	Top-left corner
WMSZ_TOPRIGHT	Top-right corner

lprc

Address of a RECT structure with the screen coordinates of the drag rectangle. To change the size or position of the drag rectangle, an application must change the members of this structure.

Return Values

• An application should return TRUE if it processes this message.

QuickInfo

  Windows NT: Requires version 4.0 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in winuser.h.

See Also

Windows Overview, Window Messages, RECT, WM_MOVING, WM_SIZE