windowsforms-devexpress-dot-xtratreelist-dot-treelist-d3a4bab6.md
Gets or sets the index of the top visible node.
Namespace : DevExpress.XtraTreeList
Assembly : DevExpress.XtraTreeList.v25.2.dll
NuGet Packages : DevExpress.Win.Navigation, DevExpress.Win.TreeList
[Browsable(false)]
public int TopVisibleNodeIndex { get; set; }
<Browsable(False)>
Public Property TopVisibleNodeIndex As Integer
| Type | Description |
|---|---|
| Int32 |
An integer value specifying the zero-based index of the top visible node.
|
If the total node height exceeds the TreeList control’s client area, end-users can scroll the control’s contents vertically. You can use the TopVisibleNodeIndex property to obtain the index of the top visible node. Assigning a value to this property results in scrolling to the specified node. Note that if the specified node is hidden within the collapsed group, its closest visible parent becomes the topmost item.
Write a TreeList.TopVisibleNodeIndexChanged event handler to perform specific actions each time the control’s content is vertically scrolled.
The following code snippets (auto-collected from DevExpress Examples) contain references to the TopVisibleNodeIndex property.
Note
The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.
winforms-treelist-save-restore-expanded-state-of-nodes/CS/TreeListViewState.cs#L61
if(topVisibleNode == null) topVisibleNode = TreeList.FocusedNode;
TreeList.TopVisibleNodeIndex = TreeList.GetVisibleIndexByNode(topVisibleNode);
}
winforms-tokenedit-dropdown-with-treelist/CS/TokenEditTest/CustomTokenEditDropDownControl.cs#L62
if(e.Delta > 0) step *= -1;
TreeList.TopVisibleNodeIndex += step;
}
winforms-treelist-save-restore-expanded-state-of-nodes/VB/TreeListViewState.vb#L68
End If
TreeList.TopVisibleNodeIndex = TreeList.GetVisibleIndexByNode(topVisibleNode)
End Try
winforms-tokenedit-dropdown-with-treelist/VB/TokenEditTest/CustomTokenEditDropDownControl.vb#L70
End If
TreeList.TopVisibleNodeIndex += [step]
End Sub
See Also