Control.AccessibilityNotifyClients Methode

Definition

Benachrichtigt Clientanwendungen für die Barrierefreiheit über AccessibleEvents.Notifies the accessibility client applications of AccessibleEvents.

Überlädt

AccessibilityNotifyClients(AccessibleEvents, Int32)

Benachrichtigt die Clientanwendungen für die Barrierefreiheit über die angegebenen AccessibleEvents für das angegebene untergeordnete Steuerelement.Notifies the accessibility client applications of the specified AccessibleEvents for the specified child control.

AccessibilityNotifyClients(AccessibleEvents, Int32, Int32)

Benachrichtigt die Clientanwendungen für die Barrierefreiheit über die angegebenen AccessibleEvents für das angegebene untergeordnete Steuerelement.Notifies the accessibility client applications of the specified AccessibleEvents for the specified child control .

AccessibilityNotifyClients(AccessibleEvents, Int32)

Benachrichtigt die Clientanwendungen für die Barrierefreiheit über die angegebenen AccessibleEvents für das angegebene untergeordnete Steuerelement.Notifies the accessibility client applications of the specified AccessibleEvents for the specified child control.

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);
protected void AccessibilityNotifyClients (System.Windows.Forms.AccessibleEvents accEvent, int childID);
member this.AccessibilityNotifyClients : System.Windows.Forms.AccessibleEvents * int -> unit
Protected Friend Sub AccessibilityNotifyClients (accEvent As AccessibleEvents, childID As Integer)
Protected Sub AccessibilityNotifyClients (accEvent As AccessibleEvents, childID As Integer)

Parameter

accEvent
AccessibleEvents

Die AccessibleEvents-Enumeration, über die die Clientanwendungen für die Barrierefreiheit benachrichtigt werden sollen.The AccessibleEvents to notify the accessibility client applications of.

childID
Int32

Das untergeordnete Control, das über das barrierefreie Ereignis benachrichtigt werden soll.The child Control to notify of the accessible event.

Beispiele

Das folgende Codebeispiel veranschaulicht die Erstellung eines Barrierefreiheits fähigen Diagramm Steuer Elements mithilfe der AccessibleObject-und Control.ControlAccessibleObject Klassen, um Barrierefreie Informationen verfügbar zu machen.The following code example demonstrates the creation of an accessibility-aware chart control, using the AccessibleObject and Control.ControlAccessibleObject classes to expose accessible information. Das-Steuerelement zeichnet zwei Kurven zusammen mit einer Legende.The control plots two curves along with a legend. Die ChartControlAccessibleObject-Klasse, die von ControlAccessibleObjectabgeleitet wird, wird in der CreateAccessibilityInstance-Methode verwendet, um benutzerdefinierte Informationen für das Diagramm Steuerelement bereitzustellen.The ChartControlAccessibleObject class, which derives from ControlAccessibleObject, is used in the CreateAccessibilityInstance method to provide custom accessible information for the chart control. Da die Diagramm Legende kein tatsächliches Control basiertes Steuerelement ist, sondern stattdessen vom Diagramm Steuerelement gezeichnet wird, sind keine integrierten zugänglichen Informationen verfügbar.Since the chart legend is not an actual Control -based control, but instead is drawn by the chart control, it does not any built-in accessible information. Aus diesem Grund überschreibt die ChartControlAccessibleObject Klasse die GetChild-Methode, um die CurveLegendAccessibleObject zurückzugeben, die barrierefreie Informationen für jeden Teil der Legende darstellt.Because of this, the ChartControlAccessibleObject class overrides the GetChild method to return the CurveLegendAccessibleObject that represents accessible information for each part of the legend. Wenn eine barrierefreie Anwendung dieses Steuerelement verwendet, kann das Steuerelement die erforderlichen zugänglichen Informationen bereitstellen.When an accessible-aware application uses this control, the control can provide the necessary accessible information.

In diesem Code Ausschnitt wird das Aufrufen der AccessibilityNotifyClients-Methode veranschaulicht.This code excerpt demonstrates calling the AccessibilityNotifyClients method. Das gesamte Codebeispiel finden Sie in der Übersicht über AccessibleObject-Klasse.See the AccessibleObject class overview for the complete code example.

   // 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 jede AccessibleEvents, über die Client Anwendungen für die Barrierefreiheit benachrichtigt werden sollen, abrufen.You must call the Control.ControlAccessibleObject.NotifyClients method for each AccessibleEvents the accessibility client applications are to be notified of. Die NotifyClients-Methode wird in der Regel aufgerufen, wenn eine Eigenschaft festgelegt wird oder innerhalb eines Ereignis Handlers.The NotifyClients method is typically called when a property is set or from within an event handler. Beispielsweise können Sie die NotifyClients-Methode aufzurufen und innerhalb des Ereignis Handlers für das Control.VisibleChanged Ereignis einen AccessibleEvents Wert von Hide übergeben.For example, you might call the NotifyClients method and pass in an AccessibleEvents value of Hide from within the event handler for the Control.VisibleChanged event.

Siehe auch

AccessibilityNotifyClients(AccessibleEvents, Int32, Int32)

Benachrichtigt die Clientanwendungen für die Barrierefreiheit über die angegebenen AccessibleEvents für das angegebene untergeordnete Steuerelement.Notifies the accessibility client applications of the specified AccessibleEvents for the specified child control .

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

accEvent
AccessibleEvents

Die AccessibleEvents-Enumeration, über die die Clientanwendungen für die Barrierefreiheit benachrichtigt werden sollen.The AccessibleEvents to notify the accessibility client applications of.

objectID
Int32

Der Bezeichner des AccessibleObject.The identifier of the AccessibleObject.

childID
Int32

Das untergeordnete Control, das über das barrierefreie Ereignis benachrichtigt werden soll.The child Control to notify of the accessible event.

Gilt für: