Control.AccessibilityNotifyClients Control.AccessibilityNotifyClients Control.AccessibilityNotifyClients Control.AccessibilityNotifyClients Method

定义

向具有辅助功能的客户端应用程序通知 AccessibleEventsNotifies the accessibility client applications of AccessibleEvents.

重载

AccessibilityNotifyClients(AccessibleEvents, Int32) AccessibilityNotifyClients(AccessibleEvents, Int32) AccessibilityNotifyClients(AccessibleEvents, Int32) AccessibilityNotifyClients(AccessibleEvents, Int32)

就指定子控件的指定 AccessibleEvents 通知辅助功能客户端应用程序。Notifies the accessibility client applications of the specified AccessibleEvents for the specified child control.

AccessibilityNotifyClients(AccessibleEvents, Int32, Int32) AccessibilityNotifyClients(AccessibleEvents, Int32, Int32) AccessibilityNotifyClients(AccessibleEvents, Int32, Int32) AccessibilityNotifyClients(AccessibleEvents, Int32, Int32)

就指定子控件的指定 AccessibleEvents 通知辅助功能客户端应用程序。Notifies the accessibility client applications of the specified AccessibleEvents for the specified child control .

AccessibilityNotifyClients(AccessibleEvents, Int32) AccessibilityNotifyClients(AccessibleEvents, Int32) AccessibilityNotifyClients(AccessibleEvents, Int32) AccessibilityNotifyClients(AccessibleEvents, Int32)

就指定子控件的指定 AccessibleEvents 通知辅助功能客户端应用程序。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 internal 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)

参数

accEvent
AccessibleEvents AccessibleEvents AccessibleEvents AccessibleEvents

要将其通报给具有辅助功能的客户端应用程序的 AccessibleEventsThe AccessibleEvents to notify the accessibility client applications of.

childID
Int32 Int32 Int32 Int32

就该辅助性事件要通知的子 ControlThe child Control to notify of the accessible event.

示例

下面的代码示例演示如何创建一个具有辅助功能的图表控件,并使用AccessibleObjectControl.ControlAccessibleObject类,以公开访问的信息。The following code example demonstrates the creation of an accessibility-aware chart control, using the AccessibleObject and Control.ControlAccessibleObject classes to expose accessible information. 控件绘制图例以及两条曲线。The control plots two curves along with a legend. ChartControlAccessibleObject类,该类派生自ControlAccessibleObject,在使用CreateAccessibilityInstance方法以提供自定义访问图表控件的信息。The ChartControlAccessibleObject class, which derives from ControlAccessibleObject, is used in the CreateAccessibilityInstance method to provide custom accessible information for the chart control. 因为不是实际图表图例Control-基于控制,但改为绘制由图表控件,它不提供任何内置的可访问信息。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. 因此,ChartControlAccessibleObject类将重写GetChild方法以返回CurveLegendAccessibleObject,它表示每个部分的图例可访问信息。Because of this, the ChartControlAccessibleObject class overrides the GetChild method to return the CurveLegendAccessibleObject that represents accessible information for each part of the legend. 当辅助功能的应用程序使用该控件时,该控件可以提供所需的可访问信息。When an accessible-aware application uses this control, the control can provide the necessary accessible information.

此代码片段演示如何调用AccessibilityNotifyClients方法。This code excerpt demonstrates calling the AccessibilityNotifyClients method. 请参阅AccessibleObject完整的代码示例的类概述。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

注解

必须调用Control.ControlAccessibleObject.NotifyClients方法为每个AccessibleEvents辅助功能客户端应用程序是接收的通知。You must call the Control.ControlAccessibleObject.NotifyClients method for each AccessibleEvents the accessibility client applications are to be notified of. NotifyClients方法通常称为在将属性设置或在事件处理程序。The NotifyClients method is typically called when a property is set or from within an event handler. 例如,可能会调用NotifyClients方法并传入AccessibleEvents的值Hide从事件处理程序中Control.VisibleChanged事件。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.

另请参阅

AccessibilityNotifyClients(AccessibleEvents, Int32, Int32) AccessibilityNotifyClients(AccessibleEvents, Int32, Int32) AccessibilityNotifyClients(AccessibleEvents, Int32, Int32) AccessibilityNotifyClients(AccessibleEvents, Int32, Int32)

就指定子控件的指定 AccessibleEvents 通知辅助功能客户端应用程序。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)

参数

accEvent
AccessibleEvents AccessibleEvents AccessibleEvents AccessibleEvents

要将其通报给具有辅助功能的客户端应用程序的 AccessibleEventsThe AccessibleEvents to notify the accessibility client applications of.

objectID
Int32 Int32 Int32 Int32

AccessibleObject 的标识符。The identifier of the AccessibleObject.

childID
Int32 Int32 Int32 Int32

就该辅助性事件要通知的子 ControlThe child Control to notify of the accessible event.

适用于