Control.AccessibilityNotifyClients Methode

protected:
 void AccessibilityNotifyClients(System::Windows::Forms::AccessibleEvents accEvent, int childID);

protected public:
 void AccessibilityNotifyClients(System::Windows::Forms::AccessibleEvents accEvent, int childID);

protected void AccessibilityNotifyClients (System.Windows.Forms.AccessibleEvents accEvent, int childID);

protected internal void AccessibilityNotifyClients (System.Windows.Forms.AccessibleEvents accEvent, int childID);

member this.AccessibilityNotifyClients : System.Windows.Forms.AccessibleEvents * int -> unit

Protected Sub AccessibilityNotifyClients (accEvent As AccessibleEvents, childID As Integer)

Protected Friend Sub AccessibilityNotifyClients (accEvent As AccessibleEvents, childID As Integer)

Parameter

Beispiele

Im folgenden Codebeispiel wird die Erstellung eines barrierefreiheitsfähigen Diagrammsteuerelements veranschaulicht, das die AccessibleObject Klassen und Control.ControlAccessibleObject verwendet, um barrierefreie Informationen verfügbar zu machen. Das Steuerelement zeichnet zwei Kurven zusammen mit einer Legende. Die ChartControlAccessibleObject -Klasse, die von ControlAccessibleObjectabgeleitet wird, wird in der CreateAccessibilityInstance -Methode verwendet, um benutzerdefinierte, zugängliche Informationen für das Diagrammsteuerelement bereitzustellen. Da es sich bei der Diagrammlegende nicht um ein tatsächlich Control basiertes Steuerelement handelt, sondern stattdessen vom Diagrammsteuerelement gezeichnet wird, enthält sie keine integrierten, zugänglichen Informationen. Aus diesem Grund überschreibt die ChartControlAccessibleObject -Klasse die -Methode, um die GetChild zurückzugeben, die CurveLegendAccessibleObject zugängliche Informationen für jeden Teil der Legende darstellt. Wenn eine barrierefreie Anwendung dieses Steuerelement verwendet, kann das Steuerelement die erforderlichen barrierefreien Informationen bereitstellen.

Dieser Codeauszug veranschaulicht das Aufrufen der AccessibilityNotifyClients -Methode. Das vollständige Codebeispiel finden Sie in der AccessibleObject Klassenübersicht.

   // Gets or sets the location for the curve legend.
   Point get()
   {
      return location;
   }

   void set( Point value )
   {
      location = value;
      chart->Invalidate();
      
      // Notifies the chart of the location change. This is used for
      // the accessibility information. AccessibleEvents::LocationChange
      // tells the chart the reason for the notification.
      chart->AccessibilityNotifyClients( AccessibleEvents::LocationChange, (dynamic_cast<CurveLegendAccessibleObject^>(AccessibilityObject))->ID );
   }

}

property String^ Name 
{

   // Gets or sets the Name for the curve legend.
   String^ get()
   {
      return name;
   }

   void set( String^ value )
   {
      if ( name != value )
      {
         name = value;
         chart->Invalidate();
         
         // Notifies the chart of the name change. This is used for
         // the accessibility information. AccessibleEvents::NameChange
         // tells the chart the reason for the notification.
         chart->AccessibilityNotifyClients( AccessibleEvents::NameChange, (dynamic_cast<CurveLegendAccessibleObject^>(AccessibilityObject))->ID );
      }
   }

}

property bool Selected 
{

   // Gets or sets the Selected state for the curve legend.
   bool get()
   {
      return selected;
   }

   void set( bool value )
   {
      if ( selected != value )
      {
         selected = value;
         chart->Invalidate();
         
         // Notifies the chart of the selection value change. This is used for
         // the accessibility information. The AccessibleEvents value depends upon
         // if the selection is true (AccessibleEvents::SelectionAdd) or
         // false (AccessibleEvents::SelectionRemove).
         chart->AccessibilityNotifyClients( selected ? AccessibleEvents::SelectionAdd : AccessibleEvents::SelectionRemove, (dynamic_cast<CurveLegendAccessibleObject^>(AccessibilityObject))->ID );
      }
   }

    // Gets or sets the location for the curve legend.
    public Point Location
    {   
        get {
            return location;
        }
        set {
            location = value;
            chart.Invalidate();

            // Notifies the chart of the location change. This is used for
            // the accessibility information. AccessibleEvents.LocationChange
            // tells the chart the reason for the notification.

            chart.AccessibilityNotifyClients(AccessibleEvents.LocationChange, 
                ((CurveLegendAccessibleObject)AccessibilityObject).ID);
        }
    }            

    // Gets or sets the Name for the curve legend.
    public string Name
    {   
        get {
            return name;
        }
        set {
            if (name != value) 
            {
                name = value;
                chart.Invalidate();

                // Notifies the chart of the name change. This is used for
                // the accessibility information. AccessibleEvents.NameChange
                // tells the chart the reason for the notification.

                chart.AccessibilityNotifyClients(AccessibleEvents.NameChange, 
                    ((CurveLegendAccessibleObject)AccessibilityObject).ID);
            }
        }
    }

    // Gets or sets the Selected state for the curve legend.
    public bool Selected
    {   
        get {
            return selected;
        }
        set {
            if (selected != value) 
            {
                selected = value;
                chart.Invalidate();

                // Notifies the chart of the selection value change. This is used for
                // the accessibility information. The AccessibleEvents value depends upon
                // if the selection is true (AccessibleEvents.SelectionAdd) or 
                // false (AccessibleEvents.SelectionRemove).
                chart.AccessibilityNotifyClients(
                    selected ? AccessibleEvents.SelectionAdd : AccessibleEvents.SelectionRemove, 
                    ((CurveLegendAccessibleObject)AccessibilityObject).ID);
            }
        }
    }

' Gets or sets the location for the curve legend.            
Public Property Location() As Point
    Get
        Return m_location
    End Get
    Set
        m_location = value
        chart.Invalidate()

        ' Notifies the chart of the location change. This is used for
        ' the accessibility information. AccessibleEvents.LocationChange
        ' tells the chart the reason for the notification.
        chart.ExposeAccessibilityNotifyClients(AccessibleEvents.LocationChange, _
                CType(AccessibilityObject, CurveLegendAccessibleObject).ID)
    End Set
End Property

' Gets or sets the Name for the curve legend.            
Public Property Name() As String
    Get
        Return m_name
    End Get
    Set
        If m_name <> value Then
            m_name = value
            chart.Invalidate()

            ' Notifies the chart of the name change. This is used for
            ' the accessibility information. AccessibleEvents.NameChange
            ' tells the chart the reason for the notification. 
            chart.ExposeAccessibilityNotifyClients(AccessibleEvents.NameChange, _
                    CType(AccessibilityObject, CurveLegendAccessibleObject).ID)
        End If
    End Set
End Property

' Gets or sets the Selected state for the curve legend.            
Public Property Selected() As Boolean
    Get
        Return m_selected
    End Get
    Set
        If m_selected <> value Then
            m_selected = value
            chart.Invalidate()

            ' Notifies the chart of the selection value change. This is used for
            ' the accessibility information. The AccessibleEvents value varies
            ' on whether the selection is true (AccessibleEvents.SelectionAdd) or 
            ' false (AccessibleEvents.SelectionRemove). 
            If m_selected Then
                chart.ExposeAccessibilityNotifyClients(AccessibleEvents.SelectionAdd, _
                        CType(AccessibilityObject, CurveLegendAccessibleObject).ID) 
            Else
                chart.ExposeAccessibilityNotifyClients(AccessibleEvents.SelectionRemove, _
                        CType(AccessibilityObject, CurveLegendAccessibleObject).ID) 
            End If
        End If
    End Set
End Property

Hinweise

Sie müssen die Control.ControlAccessibleObject.NotifyClients -Methode für alle AccessibleEvents Barrierefreiheitsclientanwendungen aufrufen, die benachrichtigt werden sollen. Die NotifyClients -Methode wird in der Regel aufgerufen, wenn eine Eigenschaft festgelegt oder aus einem Ereignishandler stammt. Sie können beispielsweise die NotifyClients -Methode aufrufen und den AccessibleEvents Wert from innerhalb des Hide Ereignishandlers für das Control.VisibleChanged Ereignis übergeben.

Weitere Informationen

• AccessibleEvents
• Controls

protected:
 void AccessibilityNotifyClients(System::Windows::Forms::AccessibleEvents accEvent, int objectID, int childID);

protected void AccessibilityNotifyClients (System.Windows.Forms.AccessibleEvents accEvent, int objectID, int childID);

member this.AccessibilityNotifyClients : System.Windows.Forms.AccessibleEvents * int * int -> unit

Protected Sub AccessibilityNotifyClients (accEvent As AccessibleEvents, objectID As Integer, childID As Integer)

Parameter