The following sample code illustrates how to supply a custom selection strategy for nodes. Note: this is not usually necessary. Normally, the selection strategy for nodes is based on the setting of the SelectionType property of the Override object.
Imports Infragistics.Win.UltraWinTree
Public Class Form1
Inherits System.Windows.Forms.Form
Implements Infragistics.Win.ISelectionStrategyFilter
Private nodeSelectionStrategy As MyCustomSelectionStrategy
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
' create the custom selection strategy
Me.nodeSelectionStrategy = New MyCustomSelectionStrategy(Me.ultraTree1)
' Set the tree control's SelectionStrategyFilter
' property to the object that implements the
' ISelectionStrategyFilter interface (in this
' case this form).
Me.ultraTree1.SelectionStrategyFilter = Me
End Sub
Public Function GetSelectionStrategy(ByVal item As Infragistics.Shared.ISelectableItem) As Infragistics.Win.ISelectionStrategy Implements Infragistics.Win.ISelectionStrategyFilter.GetSelectionStrategy
' If the item is a node return the custom strategy
If TypeOf (item) Is UltraTreeNode Then
Return Me.nodeSelectionStrategy
End If
' Return nothing to have the tree provide an appropriate strategy
Return Nothing
End Function
End Class
' Derive a class from one of the selection
' strategies defined in the PLF
Friend Class MyCustomSelectionStrategy
Inherits Infragistics.Win.SelectionStrategyExtended
Public Sub New(ByVal manager As ISelectionManager)
MyBase.New(manager)
End Sub
Public Overloads Overrides Function OnMouseDown(ByVal item As Infragistics.Shared.ISelectableItem, ByRef msginfo As Infragistics.Win.MouseMessageInfo) As Boolean
' do some custom mouse down processing
' ...
Return MyBase.OnMouseDown(item, msginfo)
End Function
End Class
'Declaration
Public Property SelectionStrategyFilter As Infragistics.Win.ISelectionStrategyFilter
using System.Diagnostics;
using Infragistics.Win.UltraWinTree;
public class Form1 : System.Windows.Forms.Form,
Infragistics.Win.ISelectionStrategyFilter
{
private MyCustomSelectionStrategy nodeSelectionStrategy;
private void Form1_Load(object sender, System.EventArgs e)
{
// create the custom selection strategy
this.nodeSelectionStrategy =
new MyCustomSelectionStrategy(this.ultraTree1 );
// Set the tree control’s SelectionStrategyFilter
// property to the object that implements the
// ISelectionStrategyFilter interface (in this
// case the this form).
this.ultraTree1.SelectionStrategyFilter = this;
}
public Infragistics.Win.ISelectionStrategy
GetSelectionStrategy(Infragistics.Shared.ISelectableItem item)
{
// If the item is a node return the custom strategy
if ( item is UltraTreeNode )
return this.nodeSelectionStrategy;
// Return null to have the tree provide an appropriate strategy
return null;
}
}
// Derive a class from one of the selection
// strategies defined in the PLF
internal class MyCustomSelectionStrategy
: SelectionStrategyExtended
{
internal MyCustomSelectionStrategy( ISelectionManager manager )
: base( manager )
{
}
public override bool OnMouseDown(Infragistics.Shared.ISelectableItem item,
ref Infragistics.Win.MouseMessageInfo msginfo)
{
// do some custom mouse down processing
// ...
return base.OnMouseDown( item, ref msginfo );
}
}
'Declaration
Public Property SelectionStrategyFilter As Infragistics.Win.ISelectionStrategyFilter
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
