SelectItem of CTreeCtrl

[zon_cpp]

Hi! how do i select 3th item of a CTreeCtrl? SelectItem() function needs HTREEITEM of specified item, but i have index of item (for example 3th item) please help me...

Zo.Naderi-Iran

[Zasky]

It's not possible to access nodes by index. You must know the handle of the node. If you don't have records of the node handles, you can parse the tree:

// Start with the root item:
HTREEITEM hRoot = myTree.GetRootItem();

// Get the first child of the root:
HTREEITEM hChild1 = myTree.GetChildItem(hRoot);

// Move through the siblings until you reach the node you want:
HTREEITEM hChild2 = myTree.GetNextSiblingItem(hChild1)
HTREEITEM hChild3 = myTree.GetNextSiblingItem(hChild2)

[Roger Allen]

You could do something like this:

HTREEITEM ItemFromIndex(int index)
{
HTREEITEM item = m_tree.GetRootItem();
while (item != NULL && index > 0)
{
item = NextTreeItem(item);
--index;
}
// if item is not NULL, you now have the HTREEITEM of the given index
return item;
}

HTREEITEM NextTreeItem(HTREEITEM hStartItem)
{
HTREEITEM hItem = hStartItem;
if (m_tree.ItemHasChildren(hItem))
{
// move down to next level
HTREEITEM hChildItem = m_tree.GetChildItem(hItem);
hItem = hChildItem;
}
else
{
bool foundSibling = false;
while (!foundSibling && hItem != NULL)
{
// move along same level
HTREEITEM hSiblingItem = m_tree.GetNextItem(hItem, TVGN_NEXT);
if (hSiblingItem != NULL)
{
hItem = hSiblingItem;
foundSibling = true;
}
else
{
// nothing on same level so move up and try again
hItem = m_tree.GetParentItem(hItem);
}
}
}
return hItem;
}

Som eof this was written from memory, other sections are code pasts, so take with a pinch of salt.

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