Selection in Windows Forms Tree Navigator

29 Apr 20213 minutes to read

The selected item of the current hierarchy level is get/set through SelectedItem property.

The following code examples allow you to set the SelectedItem.

C#

//To set the selected item in the Tree navigator.

this.treeNavigator1.SelectedItem = treeMenuItem3;

VB.NET

‘To set the selected item in the Tree navigator.

Me.treeNavigator1.SelectedItem = treeMenuItem3

SelectionChanging Event

This event is triggered before the selection of the tree menu item changes.

Event Data

SelectionStateChangingEventArgs contains the following members that provide information specific to this event.

Members	Description
NewValue	This property returns the newly selected item.
OldValue	This property returns the previously selected item.
Extended	This property returns true when the selected item is expanded.
Cancel	This property enables you to avoid particular item from Selection.

C#

void treeNavigator1_SelectionChanging(TreeNavigator sender, SelectionStateChangingEventArgs args)
   {
       args.Cancel = true;
       TreeMenuItem item = args.NewValue;
        TreeMenuItem OldItem = args.OldValue;
       bool temp = args.Expanded;
   }

VB.NET

Private Sub treeNavigator1_SelectionChanging(sender As TreeNavigator, args As SelectionStateChangingEventArgs)
        args.Cancel = True
        Dim item As TreeMenuItem = args.NewValue
        Dim OldItem As TreeMenuItem = args.OldValue
        Dim temp As Boolean = args.Expanded
End Sub

SelectionChanged Event

This event is triggered after the selection of the tree menu item changes.

Event Data

SelectionStateChangedEventArgs contains the following members that provide information specific to this event.

Members	Description
SelectedItem	This property returns the currently selected item.
Expanded	This property returns true when the selected item is expanded.
</table> C# void treeNavigator1_SelectionChanged(TreeNavigator sender, SelectionStateChangedEventArgs e) { TreeMenuItem menu = e.SelectedItem; bool temp = e.Expanded; } VB.NET Private Sub treeNavigator1_SelectionChanged(sender As TreeNavigator, e As SelectionStateChangedEventArgs) Dim menu As TreeMenuItem = e.SelectedItem Dim temp As Boolean = e.Expanded End Sub ## Selection in Windows Forms Tree Navigator Scrolling can be customized by using Touch scroll. When you mouse over or touch near scroll bar area, the scroll bar will be visible and by default, the scroll will not be visible. This can be enabled by setting UseTouchScrollBehavior property to true. The following code examples allow you to enable touch scroll. C# this.treeNavigator1.UseTouchScrollBehavior = true; VB.NET Me.treeNavigator1.UseTouchScrollBehavior = True