PrimarySelectionPolicy.GetPolicyItems メソッド

[アーティクル]
08/09/2011

主要選択を表すポリシーアイテムを返します。

名前空間: Microsoft.Windows.Design.Policies
アセンブリ: Microsoft.Windows.Design.Interaction (Microsoft.Windows.Design.Interaction.dll 内)

構文

'宣言
Protected Overrides Function GetPolicyItems ( _
    selection As Selection _
) As IEnumerable(Of ModelItem)

protected override IEnumerable<ModelItem> GetPolicyItems(
    Selection selection
)

protected:
virtual IEnumerable<ModelItem^>^ GetPolicyItems(
    Selection^ selection
) override

abstract GetPolicyItems : 
        selection:Selection -> IEnumerable<ModelItem> 
override GetPolicyItems : 
        selection:Selection -> IEnumerable<ModelItem>

protected override function GetPolicyItems(
    selection : Selection
) : IEnumerable<ModelItem>

パラメーター

selection
型: Microsoft.Windows.Design.Interaction.Selection
現在の選択。

戻り値

型: System.Collections.Generic.IEnumerable<ModelItem>
主要選択である単一の要素か、空の列挙体。

例

IsSurrogate プロパティと GetSurrogateItems メソッドを実装して、カスタムサロゲートポリシーを作成する方法を次のコード例に示します。コード全体については、「方法 : サロゲートポリシーを作成する」を参照してください。

' 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;
        }
    }
}