void CPropTree::AddToVisibleList(CPropTreeItem* pItem)
{
if (!pItem)
return;
// check for an empty visible list
if (!m_pVisbleList)
m_pVisbleList = pItem;
else
{
// Add the new item to the end of the list
CPropTreeItem* pNext;
pNext = m_pVisbleList;
while (pNext->GetNextVisible())
pNext = pNext->GetNextVisible();
pNext->SetNextVisible(pItem);
}
pItem->SetNextVisible(NULL);
}
CPropTreeItem* CPropTree::FindItem(const POINT& pt)
{
CPropTreeItem* pItem;
CPoint p = pt;
// convert screen to tree coordinates
p.y += m_Origin.y;
// search the visible list for the item
for (pItem = m_pVisbleList; pItem; pItem = pItem->GetNextVisible())
{
CPoint ipt = pItem->GetLocation();
if (p.y>=ipt.y && p.y<ipt.y + pItem->GetHeight())
return pItem;
}
return NULL;
}