ItemCheckStateChanging イベント

シンタックス

Visual Basic

'宣言
 
Public Event ItemCheckStateChanging As ItemCheckStateChangingEventHandler

C#

public event ItemCheckStateChangingEventHandler ItemCheckStateChanging

イベント データ

イベント ハンドラが、このイベントに関連するデータを含む、ItemCheckStateChangingEventArgs 型の引数を受け取りました。次の ItemCheckStateChangingEventArgs プロパティには、このイベントの固有の情報が記載されます。

プロパティ	解説
Cancel System.ComponentModel.CancelEventArgsから継承されます。
Item Infragistics.Win.UltraWinListView.CancelableItemEventArgsから継承されます。
NewValue

使用例

Visual Basic

Imports Infragistics.Win
Imports Infragistics.Win.UltraWinListView

    Private Sub ultraListView1_ItemCheckStateChanging(ByVal sender As Object, ByVal e As Infragistics.Win.UltraWinListView.ItemCheckStateChangingEventArgs) Handles ultraListView1.ItemCheckStateChanging

        Dim listView As UltraListView = CType(sender, UltraListView)

        Try

            '	Disable the ItemCheckStateChanging and ItemCheckStateChanged events,
            '	so that we don't cause infinite recursion by setting the CheckState
            '	property in response to this event.
            listView.EventManager.Disable(UltraListViewEventIds.ItemCheckStateChanging)
            listView.EventManager.Disable(UltraListViewEventIds.ItemCheckStateChanged)

            If listView.ShowGroups AndAlso e.NewValue = CheckState.Checked Then

                Dim group As UltraListViewGroup = e.Item.Group

                '	Iterate the group's Items collection, and uncheck
                '	all other items except for this one
                Dim item As UltraListViewItem
                For Each item In group.Items
                    If Not item Is e.Item Then item.CheckState = CheckState.Unchecked
                Next
            End If

		Finally

            '	Re-enable the ItemCheckStateChanging and ItemCheckStateChanged events
            listView.EventManager.Enable(UltraListViewEventIds.ItemCheckStateChanging)
            listView.EventManager.Enable(UltraListViewEventIds.ItemCheckStateChanged)
        End Try
    End Sub

    Private Sub ultraListView1_ItemCheckStateChanged(ByVal sender As Object, ByVal e As Infragistics.Win.UltraWinListView.ItemCheckStateChangedEventArgs) Handles ultraListView1.ItemCheckStateChanged

        Dim listView As UltraListView = CType(sender, UltraListView)

        '	Activate and select the item that was checked
        e.Item.Activate()
        listView.PerformAction(UltraListViewAction.SelectItem, False, False)
    End Sub

C#

using Infragistics.Win;
using Infragistics.Win.UltraWinListView;
using System.Diagnostics;


		private void ultraListView1_ItemCheckStateChanging(object sender, Infragistics.Win.UltraWinListView.ItemCheckStateChangingEventArgs e)
		{
			UltraListView listView = sender as UltraListView;
			
			try
			{
				//	Disable the ItemCheckStateChanging and ItemCheckStateChanged events,
				//	so that we don't cause infinite recursion by setting the CheckState
				//	property in response to this event.
				listView.EventManager.Disable(UltraListViewEventIds.ItemCheckStateChanging);
				listView.EventManager.Disable(UltraListViewEventIds.ItemCheckStateChanged);

				if ( listView.ShowGroups && e.NewValue == CheckState.Checked )
				{
					UltraListViewGroup group = e.Item.Group;

					//	Iterate the group's Items collection, and uncheck
					//	all other items except for this one
					foreach( UltraListViewItem item in group.Items )
					{
						if ( item != e.Item )
							item.CheckState = CheckState.Unchecked;
					}
				}
			}
			finally
			{
				//	Re-enable the ItemCheckStateChanging and ItemCheckStateChanged events.
				listView.EventManager.Enable(UltraListViewEventIds.ItemCheckStateChanging);
				listView.EventManager.Enable(UltraListViewEventIds.ItemCheckStateChanged);
			}
		}

		private void ultraListView1_ItemCheckStateChanged(object sender, Infragistics.Win.UltraWinListView.ItemCheckStateChangedEventArgs e)
		{
			UltraListView listView = sender as UltraListView;

			//	Activate and select the item that was checked
			e.Item.Activate();
			listView.PerformAction( UltraListViewAction.SelectItem, false, false );
		}