CMenu::DrawItem

Called by the framework when a visual aspect of an owner-drawn menu changes.

virtual void DrawItem(
   LPDRAWITEMSTRUCT lpDrawItemStruct 
);

Parameters

• lpDrawItemStruct
  A pointer to a DRAWITEMSTRUCT structure that contains information about the type of drawing required.

Remarks

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 CTRLTEST 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);
   }
}

Requirements

Header: afxwin.h

See Also

Reference

CMenu Class

Hierarchy Chart

Other Resources

CMenu Members