AccessibleObject.Parent プロパティ

[アーティクル]
03/28/2008

ユーザー補助オブジェクトの親を取得します。

Public Overridable ReadOnly Property Parent As AccessibleObject
[C#]
public virtual AccessibleObject Parent {get;}
[C++]
public: __property virtual AccessibleObject* get_Parent();
[JScript]
public function get Parent() : AccessibleObject;

プロパティ値

ユーザー補助オブジェクトの親を表す AccessibleObject 。親オブジェクトがない場合は null 参照 (Visual Basic では Nothing) 。

解説

継承時の注意: すべてのオブジェクトがこのプロパティをサポートする必要があります。

使用例

[Visual Basic, C#, C++] ユーザー補助情報を公開する AccessibleObject クラスおよび Control.ControlAccessibleObject クラスを使用して、ユーザー補助対応のチャートコントロールを作成する方法の例を次に示します。コントロールは、凡例に沿って 2 つの曲線をプロットします。 ControlAccessibleObject から派生された ChartControlAccessibleObject クラスは、チャートコントロールの独自のユーザー補助情報を提供することを目的として、 CreateAccessibilityInstance メソッドで使用します。チャートの凡例は実際の Control ベースのコントロールではなく、チャートコントロールによって描画されるため、組み込みのユーザー補助情報は含まれていません。このため、 ChartControlAccessibleObject クラスは、 GetChild メソッドをオーバーライドして、凡例の各部分のユーザー補助情報を表す CurveLegendAccessibleObject を返します。ユーザー補助対応のアプリケーションでこのコントロールが使用された場合、このコントロールは必要なユーザー補助情報を提供できます。

[Visual Basic, C#, C++] Parent プロパティをオーバーライドする例を次に示します。コード例全体については、 AccessibleObject クラスの概要を参照してください。

 
' Inner class CurveLegendAccessibleObject represents accessible information 
' associated with the CurveLegend object.
Public Class CurveLegendAccessibleObject
    Inherits AccessibleObject

    Private curveLegend As CurveLegend
    
    Public Sub New(curveLegend As CurveLegend)
        Me.curveLegend = curveLegend
    End Sub 'New
    
    ' Private property that helps get the reference to the parent ChartControl.                
    Private ReadOnly Property ChartControl() As ChartControlAccessibleObject
        Get
            Return CType(Parent, ChartControlAccessibleObject)
        End Get
    End Property

    ' Friend helper function that returns the ID for this CurveLegend.                
    Friend ReadOnly Property ID() As Integer
        Get
            Dim i As Integer
            For i = 0 To (ChartControl.GetChildCount()) - 1
                If ChartControl.GetChild(i) Is Me Then
                    Return i
                End If
            Next i
            Return - 1
        End Get
    End Property
    
    ' Gets the Bounds for the CurveLegend. This is used by accessibility programs.
    Public Overrides ReadOnly Property Bounds() As Rectangle
        Get
            ' The bounds is in screen coordinates.
            Dim loc As Point = curveLegend.Location
            Return New Rectangle(curveLegend.chart.PointToScreen(loc), curveLegend.Size)
        End Get
    End Property

    ' Gets or sets the Name for the CurveLegend. This is used by accessibility programs.                
    Public Overrides Property Name() As String
        Get
            Return curveLegend.Name
        End Get
        Set
            curveLegend.Name = value
        End Set
    End Property
    
    ' Gets the Curve Legend Parent's Accessible object.
    ' This is used by accessibility programs.                
    Public Overrides ReadOnly Property Parent() As AccessibleObject
        Get
            Return curveLegend.chart.AccessibilityObject
        End Get
    End Property
    
    ' Gets the role for the CurveLegend. This is used by accessibility programs.                
    Public Overrides ReadOnly Property Role() As AccessibleRole
        Get
            Return System.Windows.Forms.AccessibleRole.StaticText
        End Get
    End Property

    ' Gets the state based on the selection for the CurveLegend. 
    ' This is used by accessibility programs.                
    Public Overrides ReadOnly Property State() As AccessibleStates
        Get
            Dim stateTemp As AccessibleStates = AccessibleStates.Selectable
            If curveLegend.Selected Then
                stateTemp = stateTemp Or AccessibleStates.Selected
            End If
            Return stateTemp
        End Get
    End Property
    
    ' Navigates through siblings of this CurveLegend. This is used by accessibility programs.                
    Public Overrides Function Navigate(navdir As AccessibleNavigation) As AccessibleObject
        ' Use the Friend NavigateFromChild helper function that exists
        ' on ChartControlAccessibleObject.
        Return ChartControl.NavigateFromChild(Me, navdir)
    End Function
    
    ' Selects or unselects this CurveLegend. This is used by accessibility programs.
    Public Overrides Sub [Select](selection As AccessibleSelection)

        ' Use the internal SelectChild helper function that exists
        ' on ChartControlAccessibleObject.
        ChartControl.SelectChild(Me, selection)
    End Sub

End Class 'CurveLegendAccessibleObject

[C#] 
// Inner class CurveLegendAccessibleObject represents accessible information 
// associated with the CurveLegend object.
public class CurveLegendAccessibleObject : AccessibleObject
{
    private CurveLegend curveLegend;

    public CurveLegendAccessibleObject(CurveLegend curveLegend) : base() 
    {
        this.curveLegend = curveLegend;                    
    }                

    // Private property that helps get the reference to the parent ChartControl.
    private ChartControlAccessibleObject ChartControl
    {   
        get {
            return Parent as ChartControlAccessibleObject;
        }
    }

    // Internal helper function that returns the ID for this CurveLegend.
    internal int ID
    {
        get {
            for(int i = 0; i < ChartControl.GetChildCount(); i++) {
                if (ChartControl.GetChild(i) == this) {
                    return i;
                }
            }
            return -1;
        }
    }

    // Gets the Bounds for the CurveLegend. This is used by accessibility programs.
    public override Rectangle Bounds
    {
        get {                        
            // The bounds is in screen coordinates.
            Point loc = curveLegend.Location;
            return new Rectangle(curveLegend.chart.PointToScreen(loc), curveLegend.Size);
        }
    }

    // Gets or sets the Name for the CurveLegend. This is used by accessibility programs.
    public override string Name
    {
        get {
            return curveLegend.Name;
        }
        set {
            curveLegend.Name = value;                        
        }
    }

    // Gets the Curve Legend Parent's Accessible object.
    // This is used by accessibility programs.
    public override AccessibleObject Parent
    {
        get {
            return curveLegend.chart.AccessibilityObject;
        }
    }

    // Gets the role for the CurveLegend. This is used by accessibility programs.
    public override AccessibleRole Role 
    {
        get {
            return AccessibleRole.StaticText;
        }
    }

    // Gets the state based on the selection for the CurveLegend. 
    // This is used by accessibility programs.
    public override AccessibleStates State 
    {
        get {
            AccessibleStates state = AccessibleStates.Selectable;
            if (curveLegend.Selected) 
            {
                state |= AccessibleStates.Selected;
            }
            return state;
        }
    }

    // Navigates through siblings of this CurveLegend. This is used by accessibility programs.
    public override AccessibleObject Navigate(AccessibleNavigation navdir) 
    {
        // Uses the internal NavigateFromChild helper function that exists
        // on ChartControlAccessibleObject.
        return ChartControl.NavigateFromChild(this, navdir);
    }

    // Selects or unselects this CurveLegend. This is used by accessibility programs.
    public override void Select(AccessibleSelection selection) 
    {
        // Uses the internal SelectChild helper function that exists
        // on ChartControlAccessibleObject.
        ChartControl.SelectChild(this, selection);
    }
}

[C++] 
// Inner class CurveLegendAccessibleObject represents accessible information
// associated with the CurveLegend object.
   public:
__gc class CurveLegendAccessibleObject : public AccessibleObject {
private:
   CurveLegend*  curveLegend;

public:
   CurveLegendAccessibleObject(CurveLegend* curveLegend) : AccessibleObject() {
      this->curveLegend = curveLegend;
   }

   // Private property that helps get the reference to the parent ChartControl.
private:
   __property ChartControlAccessibleObject* get_ChartControl() {
      return dynamic_cast<ChartControlAccessibleObject*>(Parent);
   }


   // Internal helper function that returns the ID for this CurveLegend.
public private:
   __property int get_ID() {
      for (int i = 0; i < ChartControl->GetChildCount(); i++) {
         if (ChartControl->GetChild(i) == this) {
            return i;
         }
      }
      return -1;
   }

   // Gets the Bounds for the CurveLegend. This is used by accessibility programs.
public:
   __property Rectangle get_Bounds() {
      // The bounds is in screen coordinates.
      Point loc = curveLegend->Location;
      return Rectangle(curveLegend->chart->PointToScreen(loc), curveLegend->Size);
   }

   // Gets or sets the Name for the CurveLegend. This is used by accessibility programs.
   __property String* get_Name() {
      return curveLegend->Name;
   }
   __property void set_Name(String* value) {
      curveLegend->Name = value;
   }

   // Gets the Curve Legend Parent's Accessible object.
   // This is used by accessibility programs.
   __property AccessibleObject* get_Parent() {
      return curveLegend->chart->AccessibilityObject;
   }

   // Gets the role for the CurveLegend. This is used by accessibility programs.
   __property System::Windows::Forms::AccessibleRole get_Role() {
      return AccessibleRole::StaticText;
   }

   // Gets the state based on the selection for the CurveLegend.
   // This is used by accessibility programs.
   __property AccessibleStates get_State() {
      AccessibleStates state = AccessibleStates::Selectable;
      if (curveLegend->Selected) {
         state = static_cast<AccessibleStates>( state | AccessibleStates::Selected );
      }
      return state;
   }

   // Navigates through siblings of this CurveLegend. This is used by accessibility programs.
   AccessibleObject* Navigate(AccessibleNavigation navdir) {
      // Uses the internal NavigateFromChild helper function that exists
      // on ChartControlAccessibleObject.
      return ChartControl->NavigateFromChild(this, navdir);
   }

   // Selects or unselects this CurveLegend. This is used by accessibility programs.
   void Select(AccessibleSelection selection) {
      // Uses the internal SelectChild helper function that exists
      // on ChartControlAccessibleObject.
      ChartControl->SelectChild(this, selection);
   }
}; // class CurveLgendAccessibleObject

[JScript] JScript のサンプルはありません。Visual Basic、C#、および C++ のサンプルを表示するには、このページの左上隅にある言語のフィルタボタンをクリックします。

必要条件

プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ

参照

次の方法で共有

AccessibleObject.Parent プロパティ

プロパティ値

解説

使用例

必要条件

参照

その他のリソース