DROPEFFECT COleServerItem::DoDragDrop(LPCRECT lpItemRect, CPoint ptOffset,
BOOL bIncludeLink, DWORD dwEffects, LPCRECT lpRectStartDrag)
{
ASSERT(AfxIsValidAddress(lpItemRect, sizeof(RECT)));
ASSERT_VALID(this);
ASSERT_VALID(this);
DROPEFFECT dropEffect = DROPEFFECT_NONE;
COleDataSource *pDataSource = NULL;
TRY
{
// get clipboard data for this item
CSize sizeItem(
lpItemRect->right - lpItemRect->left,
lpItemRect->bottom - lpItemRect->top);
pDataSource = OnGetClipboardData(bIncludeLink, &ptOffset, &sizeItem);
// add DROPEFFECT_LINK if link source is available
LPDATAOBJECT lpDataObject = (LPDATAOBJECT)
pDataSource->GetInterface(&IID_IDataObject);
ASSERT(lpDataObject != NULL);
FORMATETC formatEtc;
formatEtc.cfFormat = (CLIPFORMAT)_oleData.cfLinkSource;
formatEtc.ptd = NULL;
formatEtc.dwAspect = DVASPECT_CONTENT;
formatEtc.lindex = -1;
formatEtc.tymed = (TYMED)-1;
if (lpDataObject->QueryGetData(&formatEtc) == S_OK)
dwEffects |= DROPEFFECT_LINK;
// calculate default sensitivity rectangle
CRect rectDrag;
if (lpRectStartDrag == NULL)
{
rectDrag.SetRect(lpItemRect->left, lpItemRect->top, lpItemRect->left,
lpItemRect->top);
lpRectStartDrag = &rectDrag;
}
// do drag drop operation
dropEffect = pDataSource->DoDragDrop(dwEffects, lpRectStartDrag);
pDataSource->InternalRelease();
}
CATCH_ALL(e)
{
if (pDataSource != NULL)
pDataSource->InternalRelease();
THROW_LAST();
}
END_CATCH_ALL
return dropEffect;
}
