TreeViewEventArgs.Action TreeViewEventArgs.Action TreeViewEventArgs.Action TreeViewEventArgs.Action Property

정의

이벤트를 발생시킨 작업 형식을 가져옵니다.Gets the type of action that raised the event.

public:
 property System::Windows::Forms::TreeViewAction Action { System::Windows::Forms::TreeViewAction get(); };
public System.Windows.Forms.TreeViewAction Action { get; }
member this.Action : System.Windows.Forms.TreeViewAction
Public ReadOnly Property Action As TreeViewAction

속성 값

이벤트를 발생시킨 TreeViewActionThe type of TreeViewAction that raised the event.

예제

다음 예제에서는 사용자 지정 TreeView합니다.The following example illustrates a customized TreeView. 상속 하는 TreeView 클래스를 사용자 지정이 버전에는 보통의 모든 기능 TreeView합니다.By inheriting the TreeView class, this custom version has all the functionality of a normal TreeView. 생성자에서 다양 한 속성 값 변경에 고유한 모양을 제공 합니다.Changing various property values in the constructor provides a unique appearance. 때문에 합니다 ShowPlusMinus 속성이 false로 설정 되어, 사용자 지정된 컨트롤 재정의 OnAfterSelect 메서드 노드를 확장 하 고 클릭할 때 축소할 수 있습니다.Because the ShowPlusMinus property is set to false, the customized control also overrides the OnAfterSelect method so nodes can be expanded and collapsed when they are clicked.

이러한 방식으로 사용자 지정 된 컨트롤을 쉽게 컨트롤 속성을 개별 프로젝트 각각 지정 하지 않고도 일관 된 인터페이스를 제공 하는 조직 전반에 걸쳐 사용할 수 있습니다.A control that is customized in this way can be used throughout an organization, making it easy to provide a consistent interface without requiring the control properties to be specified in each individual project.

public ref class CustomizedTreeView: public TreeView
{
public:
   CustomizedTreeView()
   {

      // Customize the TreeView control by setting various properties.
      BackColor = System::Drawing::Color::CadetBlue;
      FullRowSelect = true;
      HotTracking = true;
      Indent = 34;
      ShowPlusMinus = false;

      // The ShowLines property must be false for the FullRowSelect
      // property to work.
      ShowLines = false;
   }

protected:
   virtual void OnAfterSelect( TreeViewEventArgs^ e ) override
   {
      // Confirm that the user initiated the selection.
      // This prevents the first node from expanding when it is
      // automatically selected during the initialization of
      // the TreeView control.
      if ( e->Action != TreeViewAction::Unknown )
      {
         if ( e->Node->IsExpanded )
         {
            e->Node->Collapse();
         }
         else
         {
            e->Node->Expand();
         }
      }

      
      // Remove the selection. This allows the same node to be
      // clicked twice in succession to toggle the expansion state.
      SelectedNode = nullptr;
   }
};
public class CustomizedTreeView : TreeView
{
    public CustomizedTreeView()
    {
        // Customize the TreeView control by setting various properties.
        BackColor = System.Drawing.Color.CadetBlue;
        FullRowSelect = true;
        HotTracking = true;
        Indent = 34;
        ShowPlusMinus = false;

        // The ShowLines property must be false for the FullRowSelect 
        // property to work.
        ShowLines = false;
    }

    protected override void OnAfterSelect(TreeViewEventArgs e)
    {
        // Confirm that the user initiated the selection.
        // This prevents the first node from expanding when it is
        // automatically selected during the initialization of 
        // the TreeView control.
        if (e.Action != TreeViewAction.Unknown)
        {
            if (e.Node.IsExpanded) 
            {
                e.Node.Collapse();
            }
            else 
            {
                e.Node.Expand();
            }
        }

        // Remove the selection. This allows the same node to be
        // clicked twice in succession to toggle the expansion state.
        SelectedNode = null;
    }

}
Public Class CustomizedTreeView
    Inherits TreeView

    Public Sub New()
        ' Customize the TreeView control by setting various properties.
        BackColor = System.Drawing.Color.CadetBlue
        FullRowSelect = True
        HotTracking = True
        Indent = 34
        ShowPlusMinus = False

        ' The ShowLines property must be false for the FullRowSelect 
        ' property to work.
        ShowLines = False
    End Sub 'New


    Protected Overrides Sub OnAfterSelect(ByVal e As TreeViewEventArgs)
        ' Confirm that the user initiated the selection.
        ' This prevents the first node from expanding when it is
        ' automatically selected during the initialization of 
        ' the TreeView control.
        If e.Action <> TreeViewAction.Unknown Then
            If e.Node.IsExpanded Then
                e.Node.Collapse()
            Else
                e.Node.Expand()
            End If
        End If

        ' Remove the selection. This allows the same node to be
        ' clicked twice in succession to toggle the expansion state.
        SelectedNode = Nothing
    End Sub 'OnAfterSelect

End Class 'CustomizedTreeView 

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