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.
Points 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.
See Also