AccessibleObject.Parent プロパティとは何？わかりやすく解説 Weblio辞書

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AccessibleObject.Parent プロパティ

ユーザー補助オブジェクトの親を取得します。

名前空間: System.Windows.Forms
アセンブリ: System.Windows.Forms (system.windows.forms.dll 内)
構文

Visual Basic (宣言)

Public Overridable ReadOnly
 Property Parent As AccessibleObject

Visual Basic (使用法)

Dim instance As AccessibleObject
Dim value As AccessibleObject

value = instance.Parent

public virtual AccessibleObject Parent { get;
 }

C++

public:
virtual property AccessibleObject^ Parent {
    AccessibleObject^ get ();
}

/** @property */
public 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

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。

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。

Visual Basic

' 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

// 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:
   ref class CurveLegendAccessibleObject: public
 AccessibleObject
   {
   private:
      CurveLegend^ curveLegend;

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


   private:

      property ChartControlAccessibleObject^ ChartControl 
      {

         // Private property that helps get the reference to the parent
 ChartControl.
         ChartControlAccessibleObject^ get()
         {
            return dynamic_cast<ChartControlAccessibleObject^>(Parent);
         }

      }

   internal:

      property int ID 
      {

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

            }
            return  -1;
         }

      }

   public:

      property Rectangle Bounds 
      {

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

      }

      property String^ Name 
      {

         // Gets or sets the Name for the CurveLegend. This is used by accessibility
 programs.
         virtual String^ get() override
         {
            return curveLegend->Name;
         }

         virtual void set( String^ value )
 override
         {
            curveLegend->Name = value;
         }

      }

      property AccessibleObject^ Parent 
      {

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

      }

      property System::Windows::Forms::AccessibleRole Role 
      {

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

      }

      property AccessibleStates State 
      {

         // Gets the state based on the selection for the CurveLegend.
         // This is used by accessibility programs.
         virtual AccessibleStates get() override
         {
            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.
      virtual AccessibleObject^ Navigate( AccessibleNavigation navdir ) override
      {
         
         // 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.
      virtual void Select( AccessibleSelection selection ) override
      {
         
         // Uses the internal SelectChild helper function that exists
         // on ChartControlAccessibleObject.
         ChartControl->SelectChild( this, selection );
      }

   };

// Inner class CurveLegendAccessibleObject represents accessible 
// information associated with the CurveLegend object.
public static class CurveLegendAccessibleObject
 extends AccessibleObject
{
    private CurveLegend curveLegend;

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

    // Private property that helps get the reference to the parent 
    // ChartControl.
    /** @property 
     */
    private ChartControlAccessibleObject get_ChartControl()
    {
        return (ChartControlAccessibleObject)get_Parent();
    } //get_ChartControl

    // Internal helper function that returns the ID for this CurveLegend.
    /** @property 
     */
    int get_ID()
    {
        for (int i = 0; i < get_ChartControl().GetChildCount();
 i++) {
            if (get_ChartControl().GetChild(i).Equals(this))
 {
                return i;
            }
        }
        return -1;
    } //get_ID

    // Gets the Bounds for the CurveLegend. 
    // This is used by accessibility programs.
    /** @property 
     */
    public Rectangle get_Bounds()
    {
        // The bounds is in screen coordinates.
        Point loc = curveLegend.get_Location();
        return new Rectangle(curveLegend.chart.PointToScreen(loc)
,
            curveLegend.get_Size());
    } //get_Bounds

    // Gets or sets the Name for the CurveLegend. 
    // This is used by accessibility programs.
    /** @property 
     */
    public String get_Name()
    {
        return curveLegend.get_Name();
    } //get_Name

    /** @property 
     */
    public void set_Name(String value)
    {
        curveLegend.set_Name(value);
    } //set_Name

    // Gets the Curve Legend Parent's Accessible object.
    // This is used by accessibility programs.
    /** @property 
     */
    public AccessibleObject get_Parent()
    {
        return curveLegend.chart.get_AccessibilityObject();
    } //get_Parent

    // Gets the role for the CurveLegend. 
    // This is used by accessibility programs.
    /** @property 
     */
    public AccessibleRole get_Role()
    {
        return AccessibleRole.StaticText;
    } //get_Role

    // Gets the state based on the selection for the CurveLegend. 
    // This is used by accessibility programs.
    /** @property 
     */
    public AccessibleStates get_State()
    {
        AccessibleStates state = AccessibleStates.Selectable;
        if (curveLegend.get_Selected()) {
            state = state | AccessibleStates.Selected;
        }
        return state;
    } //get_State

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

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

プラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

関連項目
AccessibleObject クラス
AccessibleObject メンバ
System.Windows.Forms 名前空間
AccessibleObject.Bounds プロパティ
AccessibleObject.DefaultAction プロパティ
AccessibleObject.Description プロパティ
AccessibleObject.Help プロパティ
AccessibleObject.KeyboardShortcut プロパティ
AccessibleObject.Name プロパティ
Role
State
Value

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AccessibleObject.Parent プロパティとは？わかりやすく解説