Advanced MFC Programming

Chapter 5. Common Controls
overridden function shows how to load correct bitmap by examining nIDCtl and lpDrawItemStruct-
>itemData:
void CCCtlDlg::OnDrawItem(int nIDCtl, LPDRAWITEMSTRUCT lpDrawItemStruct)
{
CBitmap bmp;
CBitmap *ptrBmpOld;
CDC *ptrDC;
CDC dcMemory;
CRect rect;
BITMAP bm;
……
if(nIDCtl == IDC_LIST)
{
switch(lpDrawItemStruct->itemData)
{
case LIST_SMILE_1:
{
bmp.LoadBitmap(IDB_BITMAP_SMILE_1);
break;
}
case LIST_SMILE_2:
{
bmp.LoadBitmap(IDB_BITMAP_SMILE_2);
break;
}
case LIST_SMILE_3:
{
bmp.LoadBitmap(IDB_BITMAP_SMILE_3);
break;
}
case LIST_SMILE_4:
{
bmp.LoadBitmap(IDB_BITMAP_SMILE_4);
break;
}
}
}
if(nIDCtl == IDC_COMBO)
{
switch(lpDrawItemStruct->itemData)
{
case COMBO_BUTTON:
{
if(lpDrawItemStruct->itemState & ODS_SELECTED)
{
bmp.LoadBitmap(IDB_BITMAP_BUTTON_SEL);
}
else
{
bmp.LoadBitmap(IDB_BITMAP_BUTTON_UNSEL);
}
break;
}
case COMBO_BIGSMILE:
{
if(lpDrawItemStruct->itemState & ODS_SELECTED)
{
bmp.LoadBitmap(IDB_BITMAP_BIG_SMILE_1);
}
else
{
bmp.LoadBitmap(IDB_BITMAP_BIG_SMILE_2);
}
break;
}
}
}
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