Scrollin a TreeView - Xtreme Visual Basic Talk

05-23-2003, 10:14 AM

NeoGioZ

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Join Date: Oct 2001

Location: Florida

Posts: 115

Scrollin a TreeView

I have a TreeView control that will refresh it self every 30 seconds. The problem is that after the user has scrolled, say, half way down the TreeView and the TreeView refreshes (i.e. TreeView.Nodes.Clear and repopulate) the TreeView goes back to the top. I know how to keep the same structure that the user was looking at and record the top Node being displayed at the time. What I don't know how to do is make the TreeView scroll down. I thought about using the SendMessage API to tell the tree view to scroll down and keep testing the top noded but I think that could get a little messy. Any ideas?

Thanks in Advance

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NeoGioZ

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05-23-2003, 10:48 AM

DrPunk

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Location: Never where I want to be

Posts: 1,272

You should be able to call the EnsureVisible method of the selected node.

Code:

Treeview1.SelectedItem.EnsureVisible

' Or to be really careful
If Not Treeview1.SelectedItem is Nothing Then
    Treeview1.SelectedItem.EnsureVisible
End if

05-23-2003, 12:03 PM

NeoGioZ

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Join Date: Oct 2001

Location: Florida

Posts: 115

EnsureVisible

Thanks for your reply.

EnsureVisible will not work because all it does is make sure that if the Current Node is a child that it will expand all the necesary parents to ensure that the Current Node is visisble.

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NeoGioZ

"I wish I was a neutron bomb, for once I could go off" -- Pearl Jam

05-23-2003, 12:28 PM

DrPunk

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Location: Never where I want to be

Posts: 1,272

Quote:
Originally Posted by NeoGioZ
Thanks for your reply.

EnsureVisible will not work because all it does is make sure that if the Current Node is a child that it will expand all the necesary parents to ensure that the Current Node is visisble.

Are you sure?

This code works on my PC, in that it adds 100 children to a root, and makes sure child66 is visible in the list. Make the treeview tiny.

Code:

Dim i As Long

TreeView.Nodes.Clear

TreeView1.Nodes.Add , , "Top", "Top"

For i = 1 To 100
    TreeView1.Nodes.Add "Top", tvwChild, "Child" & i, "Child" & i
Next
    
TreeView1.Nodes("Child66").Selected = True
TreeView1.SelectedItem.EnsureVisible
    
TreeView1.SetFocus

If it really doesn't work for you then what release of the Windows Common Controls are you using? It should have a "(SP?)" after the name of the component.

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