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Код


void 
CDisableItemComboBox::DrawItem( LPDRAWITEMSTRUCT lpDrawItemStruct )
{
    ASSERT(lpDrawItemStruct->CtlType == ODT_COMBOBOX);
    LPCTSTR lpszText = (LPCTSTR) lpDrawItemStruct->itemData;
    ASSERT(lpszText != NULL);
    CDC dc;
    dc.Attach(lpDrawItemStruct->hDC);
    // Save these value to restore them when done drawing.
    COLORREF crOldTextColor = dc.GetTextColor();
    COLORREF crOldBkColor = dc.GetBkColor();

    //if item is Disabled
    bool enabled = enabledStatus_[lpDrawItemStruct->itemID];
    // If this item is selected, set the background color 
    // and the text color to appropriate values. Erase
    // the rect by filling it with the background color.

    if ((lpDrawItemStruct->itemAction | ODA_SELECT) &&
        (lpDrawItemStruct->itemState  & ODS_SELECTED))
    {
        dc.SetTextColor((enabled)?(::GetSysColor(COLOR_HIGHLIGHTTEXT)):(::GetSysColor(COLOR_GRAYTEXT)));
        dc.SetBkColor(::GetSysColor(COLOR_HIGHLIGHT));
        dc.FillSolidRect(&lpDrawItemStruct->rcItem, ::GetSysColor(COLOR_HIGHLIGHT));
    }
    else
    {
        dc.FillSolidRect(&lpDrawItemStruct->rcItem, crOldBkColor);
        if(!enabled)
            dc.SetTextColor(::GetSysColor(COLOR_GRAYTEXT));
    }

    // Draw the text.
    const RECT &rc=lpDrawItemStruct->rcItem;
    dc.ExtTextOut(rc.left + 2,
                        rc.top + 2,
                        ETO_OPAQUE, &rc,lpszText, strlen(lpszText), NULL);
    // Reset the background color and the text color back to their
    // original values.
    dc.SetTextColor(crOldTextColor);
    dc.SetBkColor(crOldBkColor);

    dc.Detach();
}

Код


void 
CDisableItemComboBox::MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct) 
{
    ASSERT(lpMeasureItemStruct->CtlType == ODT_COMBOBOX);

    if (lpMeasureItemStruct->itemID != (UINT) -1)
    {
        LPCTSTR lpszText = (LPCTSTR) lpMeasureItemStruct->itemData;
        ASSERT(lpszText != NULL);
        CSize   sz;
        CDC*    pDC = GetDC();

        sz = pDC->GetTextExtent(lpszText);

        ReleaseDC(pDC);

        lpMeasureItemStruct->itemHeight = sz.cy;
    }
}