Scroll Event on a hierarchical tree

Is it possible to intercept a scroll event on a hierarchical
tree item, and how much the tree has been scrolled?
many thanks in advance,
Michele Pantaleo
null

Hello,
I was able to reproduce your issue fast.I was able, also to find a solution to your issue, solution that came after performing several tests.
What i found out:
--the expansion begins from root and ends with the last leaf.That is why the scroll bar stays at the bottom.
--if you click on leaf node and then click expansion(which after the while loop has the following code:
node := Ftree.Find_Tree_Node(htree, '');
Ftree.Set_Tree_Selection(htree, node, Ftree.SELECT_ON);)
it will work to achieve what you want.
Here is the full procedure for the expanded tree that lets the scroll bar at the top:
PROCEDURE explose_tree IS
node ftree.node;
htree ITEM;
state varchar2(30);
state1 varchar2(30);
BEGIN
-- Search the tree identifiant --
htree := Find_Item('block2.tree4');
-- Search the root --
     node := Ftree.Find_Tree_Node(htree, '');
     --Ftree.Set_Tree_Selection(htree, node, Ftree.SELECT_ON);
-- Expand all nodes --
WHILE NOT Ftree.ID_NULL(node) LOOP
state := Ftree.Get_Tree_Node_Property(htree, node, Ftree.NODE_STATE);
IF state = Ftree.COLLAPSED_NODE THEN
Ftree.Set_Tree_Node_Property(htree, node, Ftree.NODE_STATE, Ftree.EXPANDED_NODE);
elsIF state = Ftree.LEAF_NODE then --this is the key that help to solve your problem
     Ftree.Set_Tree_Selection(htree, node, Ftree.SELECT_ON);
END IF;
node := Ftree.Find_Tree_Node(htree, '', ftree.find_NEXT,Ftree.NODE_LABEL,'', node);
END LOOP;
-- Now go the root --
     node := Ftree.Find_Tree_Node(htree, '');
--you need to select the root, otherwise the scroll bar will be at the bottom
Ftree.Set_Tree_Selection(htree, node, Ftree.SELECT_ON);
end;
Regards,
Alex

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Message was edited by:
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Help me for your ideas.
Regards.
Edited by: 794982 on 17 sept. 2010 04:55
Edited by: 794982 on 17 sept. 2010 05:01
Edited by: 794982 on 17 sept. 2010 05:04
Edited by: 794982 on 17 sept. 2010 05:06
Edited by: 794982 on 17 sept. 2010 05:13
Edited by: 794982 on 17 sept. 2010 05:19
Edited by: 794982 on 17 sept. 2010 05:23

Ok Francois Thanks for your response.
Just I pricise i work with oracle forms version 9.0.4.0.19 .
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I don't khnow where is the problem ?
Any other suggestion ? please
Regards.

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