CMenu::DrawItem
virtualvoidDrawItem(LPDRAWITEMSTRUCTlpDrawItemStruct**);**
Parameters
lpDrawItemStruct
A pointer to a DRAWITEMSTRUCT structure that contains information about the type of drawing required.
Remarks
Called by the framework when a visual aspect of an owner-drawn menu changes. The itemAction member of the DRAWITEMSTRUCT structure defines the drawing action that is to be performed. Override this member function to implement drawing for an owner-draw CMenu object. The application should restore all graphics device interface (GDI) objects selected for the display context supplied in lpDrawItemStruct before the termination of this member function.
See CWnd::OnDrawItem for a description of the DRAWITEMSTRUCT structure.
Example
The following code is from the MFC sample:
// Override DrawItem() to implement drawing for an owner-draw CMenu object.
// CColorMenu is a CMenu-derived class.
void CColorMenu::DrawItem(LPDRAWITEMSTRUCT lpDIS)
{
CDC* pDC = CDC::FromHandle(lpDIS->hDC);
COLORREF cr = (COLORREF)lpDIS->itemData; // RGB in item data
if (lpDIS->itemAction & ODA_DRAWENTIRE)
{
// Paint the color item in the color requested
CBrush br(cr);
pDC->FillRect(&lpDIS->rcItem, &br);
}
if ((lpDIS->itemState & ODS_SELECTED) &&
(lpDIS->itemAction & (ODA_SELECT | ODA_DRAWENTIRE)))
{
// item has been selected - hilite frame
COLORREF crHilite = RGB(255-GetRValue(cr),
255-GetGValue(cr), 255-GetBValue(cr));
CBrush br(crHilite);
pDC->FrameRect(&lpDIS->rcItem, &br);
}
if (!(lpDIS->itemState & ODS_SELECTED) &&
(lpDIS->itemAction & ODA_SELECT))
{
// Item has been de-selected -- remove frame
CBrush br(cr);
pDC->FrameRect(&lpDIS->rcItem, &br);
}
}