WM_DRAWITEM

The WM_DRAWITEM message is sent to the owner window of an owner-drawn button, combo box, list box, or menu when a visual aspect of the button, combo box, list box, or menu has changed.

WM_DRAWITEM 
idCtl = (UINT) wParam;             // control identifier 
lpdis = (LPDRAWITEMSTRUCT) lParam; // item-drawing information 
 

Parameters

idCtl

Value of wParam. Specifies the identifier of the control that sent the WM_DRAWITEM message. If the message was sent by a menu, this parameter is zero.

lpdis

Value of lParam. Pointer to a DRAWITEMSTRUCT structure containing information about the item to be drawn and the type of drawing required.

Return Values

If an application processes this message, it should return TRUE.

Default Action

The DefWindowProc function draws the focus rectangle for an owner-drawn list box item.

Remarks

The itemAction member of the DRAWITEMSTRUCT structure specifies the drawing operation that an application should perform.

Before returning from processing this message, an application should ensure that the device context identified by the hDC member of the DRAWITEMSTRUCT structure is in the default state.

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Requires version 1.0 or later.
  Header: Declared in winuser.h.

See Also

Combo Boxes Overview, Combo Box Messages, DefWindowProc, DRAWITEMSTRUCT