SelectionPolicy 클래스

아티클
08/22/2008

업데이트: 2007년 11월

선택된 모든 항목을 사용할 수 있게 하는 정책입니다.

네임스페이스: Microsoft.Windows.Design.Policies
어셈블리: Microsoft.Windows.Design.Extensibility(Microsoft.Windows.Design.Extensibility.dll)

구문

<RequiresContextItemAttribute(GetType(Selection))> _
<RequiresContextItemAttribute(GetType(Tool))> _
Public Class SelectionPolicy _
    Inherits ItemPolicy

Dim instance As SelectionPolicy

[RequiresContextItemAttribute(typeof(Selection))]
[RequiresContextItemAttribute(typeof(Tool))]
public class SelectionPolicy : ItemPolicy

[RequiresContextItemAttribute(typeof(Selection))]
[RequiresContextItemAttribute(typeof(Tool))]
public ref class SelectionPolicy : public ItemPolicy

public class SelectionPolicy extends ItemPolicy

설명

이 정책에서 파생하여 IsInPolicy 및 GetPolicyItems 메서드를 재정의하면 선택 내용을 필요에 따라 필터링할 수 있습니다.

예제

다음 코드 예제에서는 기본 선택 내용에 대한 사용자 지정 서로게이트 정책을 구현하는 방법을 보여 줍니다. 전체 코드는 방법: 서로게이트 정책 만들기를 참조하십시오.

' The DockPanelPolicy class implements a surrogate policy that
' provides container semantics for a selected item. By using 
' this policy, the DemoDockPanel container control offers 
' additional tasks and adorners on its children. 
Class DockPanelPolicy
    Inherits PrimarySelectionPolicy

    Public Overrides ReadOnly Property IsSurrogate() As Boolean 
        Get
            Return True
        End Get
    End Property

    Public Overrides Function GetSurrogateItems( _
        ByVal item As Microsoft.Windows.Design.Model.ModelItem) _
        As System.Collections.Generic.IEnumerable( _
        Of Microsoft.Windows.Design.Model.ModelItem)

        Dim parent As ModelItem = item.Parent

        Dim e As New System.Collections.Generic.List(Of ModelItem)

        If (parent IsNot Nothing) Then

            e.Add(parent)

        End If

        Return e

    End Function

End Class

// The DockPanelPolicy class implements a surrogate policy that
// provides container semantics for a selected item. By using 
// this policy, the DemoDockPanel container control offers 
// additional tasks and adorners on its children. 
class DockPanelPolicy : PrimarySelectionPolicy 
{
    public override bool IsSurrogate 
    {
        get 
        { 
            return true;
        }
    }

    public override IEnumerable<ModelItem> GetSurrogateItems(ModelItem item) 
    {
        ModelItem parent = item.Parent;

        if (parent != null)
        {
            yield return parent;
        }
    }
}