バージョン

SetEnabled(TreeEventIds,Boolean) メソッド

特定のイベントを有効/無効にします。
シンタックス
'宣言
 
Public Overloads Sub SetEnabled( _
   ByVal eventid As TreeEventIds, _
   ByVal enabled As Boolean _
) 
public void SetEnabled( 
   TreeEventIds eventid,
   bool enabled
)

パラメータ

eventid
イベントを有効/無効に指定する列挙体。
enabled
イベントを有効 (True) または無効 (False) のいずれかに指定するブール値。
解説

イベントを無効にすると、コントロールの内部操作に影響しません。無効にすると、プログラマが入力したコードが発生しないように、コントロールにイベント ハンドラーを呼び出さないように指示するだけです。

たとえば、Click を無効にすると、クリックした時にコントロールが Active Node を変更しないようにします。コントロールがクリックされた時に Click Event が発生しなくなるだけです。

使用例
Imports Infragistics.Win.UltraWinTree

Private Sub button20_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles button20.Click

    If Me.ultraTree1.ActiveNode Is Nothing Then Return

    Dim eventManager As TreeEventManager

    ' Get the tree's event manager.
    ' The event manager is used to temporarily disable events
    ' to prevent them from being raised. This can be very
    ' convenient in a situation where one or more properties
    ' are being set in code and the events they would normally 
    ' raise would cause unnecessary or counter-productive
    ' code to be executed.
    '
    ' Note: All events are enabled by default.
    eventManager = Me.ultraTree1.EventManager

    ' Disable the Before/AfterSelect events
    eventManager.SetEnabled(TreeEventIds.BeforeSelect, False)
    eventManager.SetEnabled(TreeEventIds.AfterSelect, False)

    ' Toggle the selection state of the active node.
    ' Note: This would normally cause the Before/AfterSelect 
    ' events to be raised. However, since the above code 
    ' disabled the events they won't be.
    Me.ultraTree1.ActiveNode.Selected = Not Me.ultraTree1.ActiveNode.Selected()

    ' Re-enable the Before/AfterSelect events
    eventManager.SetEnabled(TreeEventIds.BeforeSelect, True)
    eventManager.SetEnabled(TreeEventIds.AfterSelect, True)

    ' The 'AllEventsEnabled' property lets you enable/disable
    ' all events will a single line of code. If any event is 
    ' disabled the 'AllEventsEnabled' property returns false.
    If Not eventManager.AllEventsEnabled Then
        eventManager.AllEventsEnabled = True
    End If

    ' The event manager also exposes an 'IsEnabled' method
    ' to see if an event is enabled or disbled.
    If Not eventManager.IsEnabled(TreeEventIds.BeforeSelect) Then
        eventManager.SetEnabled(TreeEventIds.BeforeSelect, True)
    End If

    ' The tree event manager also exposes overloaded 
    ' 'IsEnabled' and 'SetEnabled' methods that take an  
    ' event group so that, for example all 'Before' or all
    ' 'After' events can be enabled/disabled. If any event
    ' in the group is disabled the 'IsEnabled' method returns
    ' false.
    If Not eventManager.IsEnabled(EventGroups.BeforeEvents) Then
        eventManager.SetEnabled(EventGroups.BeforeEvents, True)
    End If

    ' The 'InProgress' method will return true if the 
    ' specified event is currently being raised. This
    ' is often helpful in methods that can be called
    ' from various points in an application to determine
    ' what is triggering the call.
    If eventManager.InProgress(TreeEventIds.BeforeSelect) Then
        ' ... 
    End If

    eventManager.SetEnabled(EventGroups.AfterEvents, True)

End Sub
using Infragistics.Win.UltraWinTree;

private void button20_Click(object sender, System.EventArgs e)
{

	if ( this.ultraTree1.ActiveNode == null )
		return;

	// Get the tree's event manager.
	// The event manager is used to temporarily disable events
	// to prevent them from being raised. This can be very
	// convenient in a situation where one or more properties
	// are being set in code and the events they would normally 
	// raise would cause unnecessary or counter-productive
	// code to be executed.
	//
	// Note: All events are enabled by default.
	TreeEventManager eventManager = this.ultraTree1.EventManager;

	// Disable the Before/AfterSelect events
	eventManager.SetEnabled( TreeEventIds.BeforeSelect, false );
	eventManager.SetEnabled( TreeEventIds.AfterSelect, false );

	// Toggle the selection state of the active node.
	// Note: This would normally cause the Before/AfterSelect 
	// events to be raised. However, since the above code 
	// disabled the events they won't be.
	this.ultraTree1.ActiveNode.Selected = 
		!this.ultraTree1.ActiveNode.Selected;

	// Re-enable the Before/AfterSelect events
	eventManager.SetEnabled( TreeEventIds.BeforeSelect, true );
	eventManager.SetEnabled( TreeEventIds.AfterSelect, true );

	// The 'AllEventsEnabled' property lets you enable/disable
	// all events will a single line of code. If any event is 
	// disabled the 'AllEventsEnabled' property returns false.
	if ( !eventManager.AllEventsEnabled )
		eventManager.AllEventsEnabled = true;

	// The event manager also exposes an 'IsEnabled' method
	// to see if an event is enabled or disbled.
	if ( !eventManager.IsEnabled(TreeEventIds.BeforeSelect ) )
		eventManager.SetEnabled(TreeEventIds.BeforeSelect, true );

	// The tree event manager also exposes overloaded 
	// 'IsEnabled' and 'SetEnabled' methods that take an  
	// event group so that, for example all 'Before' or all
	// 'After' events can be enabled/disabled. If any event
	// in the group is disabled the 'IsEnabled' method returns
	// false.
	if ( !eventManager.IsEnabled(EventGroups.BeforeEvents ) )
		eventManager.SetEnabled(EventGroups.BeforeEvents, true );

	eventManager.SetEnabled(EventGroups.AfterEvents, true );

	// The 'InProgress' method will return true if the 
	// specified event is currently being raised. This
	// is often helpful in methods that can be called
	// from various points in an application to determine
	// what is triggering the call.
	if ( eventManager.InProgress( TreeEventIds.BeforeSelect ) )
	{
		// ... 
	}
		
}
参照