AccessibleStates AccessibleStates AccessibleStates AccessibleStates Enum

定义

指定表示辅助性对象的可能状态的值。Specifies values representing possible states for an accessible object.

此枚举有一个 FlagsAttribute 属性,允许按位组合成员值。

public enum class AccessibleStates
[System.Flags]
public enum AccessibleStates
type AccessibleStates = 
Public Enum AccessibleStates
继承
AccessibleStatesAccessibleStatesAccessibleStatesAccessibleStates
属性

字段

AlertHigh AlertHigh AlertHigh AlertHigh 268435456

应该立即传达给用户的重要信息。The important information that should be conveyed to the user immediately. 例如,降低到临界低电平的电池电量指示器将转换为此状态,这种情况下,盲访问实用工具会立即将该信息通知给用户,并且屏幕放大程序会滚动屏幕,以便能够看到电池指示器。For example, a battery-level indicator reaching a critical low level would transition to this state, in which case, a blind access utility would announce this information immediately to the user, and a screen magnification program would scroll the screen so that the battery indicator is in view. 此状态也适用于任何提示或用户在能够继续操作之前必须要先完成的操作。This state is also appropriate for any prompt or operation that must be completed before the user can continue.

AlertLow AlertLow AlertLow AlertLow 67108864

对于用户或许不重要的低优先级信息。The low-priority information that might not be important to the user.

AlertMedium AlertMedium AlertMedium AlertMedium 134217728

不需要立即传达给用户的重要信息。The important information that does not need to be conveyed to the user immediately. 例如,当电池电量指示器即将达到低电平时,它会生成中级警报。For example, when a battery-level indicator is starting to reach a low level, it could generate a medium-level alert. 然后,盲访问实用工具会发出声音,使用户知道有重要信息,而实际并不中断用户的工作。Blind access utilities could then generate a sound to let the user know that important information is available, without actually interrupting the user's work. 用户可以在任何选定时间查询警报信息。Users can then query the alert information any time they choose.

Animated Animated Animated Animated 16384

迅速或经常更改外观的对象。The object that rapidly or constantly changes appearance. 偶尔会动(并非一直在动)的图形应该定义为 GraphicORAnimatedGraphics that are occasionally animated, but not always, should be defined as GraphicORAnimated. 此状态不应用来指示对象的位置正在更改。This state should not be used to indicate that the object's location is changing.

Busy Busy Busy Busy 2048

不能在其当前条件下接受输入的控件。A control that cannot accept input in its current condition.

Checked Checked Checked Checked 16

具有选中的复选框的对象。An object with a selected check box.

Collapsed Collapsed Collapsed Collapsed 1024

对象的隐藏子级,这些子级是大纲或树结构中的项。The hidden children of the object that are items in an outline or tree structure.

Default Default Default Default 256

默认按钮或菜单项。The default button or menu item.

Expanded Expanded Expanded Expanded 512

对象的显示子级,这些子级是大纲或树结构中的项。The displayed children of the object that are items in an outline or tree structure.

ExtSelectable ExtSelectable ExtSelectable ExtSelectable 33554432

改动的选择,其中,选择定位点之间的所有对象(带有键盘焦点的对象)以及此对象都采用定位点对象的选择状态。The altered selection such that all objects between the selection anchor, which is the object with the keyboard focus, and this object take on the anchor object's selection state. 如果没有选择定位点对象,对象就会从所选内容中移除。If the anchor object is not selected, the objects are removed from the selection. 如果选择了定位点对象,所选内容就会扩展至包括此对象以及定位点之间的所有对象。If the anchor object is selected, the selection is extended to include this object and all objects in between. 您可以通过将它与 AddSelectionRemoveSelection 结合使用来设置所选内容状态。You can set the selection state by combining this with AddSelection or RemoveSelection. 此状态不会更改焦点或选择定位点,除非将它与 TakeFocus 结合使用。This state does not change the focus or the selection anchor unless it is combined with TakeFocus.

Floating Floating Floating Floating 4096

没有固定到其父对象的边界的对象和不会随父对象一起自动移动的对象。The object that is not fixed to the boundary of its parent object and that does not move automatically along with the parent.

Focusable Focusable Focusable Focusable 1048576

可接收键盘焦点的活动窗口上的对象。The object on the active window that can receive keyboard focus.

Focused Focused Focused Focused 4

具有键盘焦点的对象。An object with the keyboard focus.

HasPopup HasPopup HasPopup HasPopup 1073741824

该对象在调用会显示弹出菜单或窗口。The object displays a pop-up menu or window when invoked.

HotTracked HotTracked HotTracked HotTracked 128

由鼠标热跟踪的对象,意味着其外观突出显示以表示鼠标指针停留在其上。The object hot-tracked by the mouse, meaning its appearance is highlighted to indicate the mouse pointer is located over it.

Indeterminate Indeterminate Indeterminate Indeterminate 32

状态不确定的三态复选框或工具栏按钮。A three-state check box or toolbar button whose state is indeterminate. 复选框既不处于选中状态也不处于未选中状态,而是处于第三种状态或混合状态。The check box is neither checked nor unchecked, and it is in the third or mixed state.

Invisible Invisible Invisible Invisible 32768

没有可视用户界面的对象。An object without a visible user interface.

Linked Linked Linked Linked 4194304

以前没有选择的链接对象。A linked object that has not been previously selected.

Marqueed Marqueed Marqueed Marqueed 8192

具有滚动或移动文本或图形的对象。An object with scrolling or moving text or graphics.

Mixed Mixed Mixed Mixed 32

状态不确定的三态复选框或工具栏按钮。A three-state check box or toolbar button whose state is indeterminate. 复选框既不处于选中状态也不处于未选中状态,而是处于第三种状态或混合状态。The check box is neither checked nor unchecked, and it is in the third or mixed state.

Moveable Moveable Moveable Moveable 262144

可移动对象。A movable object.

MultiSelectable MultiSelectable MultiSelectable MultiSelectable 16777216

接受多个选定项的对象。An object that accepts multiple selected items.

None None None None 0

无状态。No state.

Offscreen Offscreen Offscreen Offscreen 65536

无屏幕表示形式。No on-screen representation. 声音或警报对象,或者从不呈现可视状态的隐藏窗口,都会具有此状态。A sound or alert object would have this state, or a hidden window that is never made visible.

Pressed Pressed Pressed Pressed 8

被按下的对象。A pressed object.

Protected Protected Protected Protected 536870912

有密码保护的编辑控件。A password-protected edit control.

ReadOnly ReadOnly ReadOnly ReadOnly 64

只读对象。A read-only object.

Selectable Selectable Selectable Selectable 2097152

可以接受所选内容的对象。An object that can accept selection.

Selected Selected Selected Selected 2

选定的对象。A selected object.

SelfVoicing SelfVoicing SelfVoicing SelfVoicing 524288

对象或子级可以使用“文字到语音”(TTS)来描述自己。The object or child can use text-to-speech (TTS) to describe itself. 当具有此状态的对象有焦点时,基于语音的辅助功能不会通告信息,因为对象会自动通告有关它自身的信息。A speech-based accessibility aid should not announce information when an object with this state has the focus, because the object automatically announces information about itself.

Sizeable Sizeable Sizeable Sizeable 131072

可调整大小的对象。A sizable object.

Traversed Traversed Traversed Traversed 8388608

以前已选择的链接对象。A linked object that has previously been selected.

Unavailable Unavailable Unavailable Unavailable 1

不可用的对象。An unavailable object.

Valid Valid Valid Valid 1073741823

有效的对象。A valid object. 此属性在 .NET Framework 2.0.NET Framework 2.0 中已被否决。This property is deprecated in .NET Framework 2.0.NET Framework 2.0.

示例

下面的代码示例演示如何创建可访问感知的图表控件, AccessibleObject并使用和Control.ControlAccessibleObject类公开可访问的信息。The following code example demonstrates the creation of an accessibility-aware chart control, using the AccessibleObject and Control.ControlAccessibleObject classes to expose accessible information. 控件将两条曲线与图例一起绘制。The control plots two curves along with a legend. CreateAccessibilityInstanceChartControlAccessibleObject 派生的类在方法中用于为图表控件提供自定义的可访问信息。ControlAccessibleObjectThe ChartControlAccessibleObject class, which derives from ControlAccessibleObject, is used in the CreateAccessibilityInstance method to provide custom accessible information for the chart control. 因为图表图例不是基于Control的实际控件, 而是由图表控件绘制的, 所以它不包含任何内置的可访问信息。Because the chart legend is not an actual control based on Control, but instead is drawn by the chart control, it does not contain any built-in accessible information. 因此, ChartControlAccessibleObjectCurveLegendAccessibleObjectGetChild重写方法以返回, 该方法表示图例的每个部分的可访问信息。Because of this, the ChartControlAccessibleObject class overrides the GetChild method to return the CurveLegendAccessibleObject that represents accessible information for each part of the legend. 当可访问感知的应用程序使用此控件时, 控件可以提供必需的可访问信息。When an accessible-aware application uses this control, the control can provide the necessary accessible information.

此代码摘录演示了如何AccessibleStates将枚举State与属性一起使用。This code excerpt demonstrates using the AccessibleStates enumeration with the State property. 有关完整的代码示例, 请参阅类概述。AccessibleObjectSee the AccessibleObject class overview for the complete code example.

// Inner class ChartControlAccessibleObject represents accessible information associated with the ChartControl.
// The ChartControlAccessibleObject is returned in the ChartControl::CreateAccessibilityInstance .
ref class ChartControlAccessibleObject: public ControlAccessibleObject
{
private:
   ChartControl^ chartControl;

public:
   ChartControlAccessibleObject( ChartControl^ ctrl )
      : ControlAccessibleObject( ctrl )
   {
      chartControl = ctrl;
   }


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

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

   }

   property AccessibleStates State 
   {

      // Gets the state for the Chart. This is used by accessibility programs.
      virtual AccessibleStates get() override
      {
         return AccessibleStates::ReadOnly;
      }

   }

   // The CurveLegend objects are "child" controls in terms of accessibility so
   // return the number of ChartLengend objects.
   virtual int GetChildCount() override
   {
      return chartControl->Legends->Length;
   }


   // Gets the Accessibility object of the child CurveLegend idetified by index.
   virtual AccessibleObject^ GetChild( int index ) override
   {
      if ( index >= 0 && index < chartControl->Legends->Length )
      {
         return chartControl->Legends[ index ]->AccessibilityObject;
      }

      return nullptr;
   }


internal:

   // Helper function that is used by the CurveLegend's accessibility object
   // to navigate between sibiling controls. Specifically, this function is used in
   // the CurveLegend::CurveLegendAccessibleObject.Navigate function.
   AccessibleObject^ NavigateFromChild( CurveLegend::CurveLegendAccessibleObject^ child, AccessibleNavigation navdir )
   {
      switch ( navdir )
      {
         case AccessibleNavigation::Down:
         case AccessibleNavigation::Next:
            return GetChild( child->ID + 1 );

         case AccessibleNavigation::Up:
         case AccessibleNavigation::Previous:
            return GetChild( child->ID - 1 );
      }
      return nullptr;
   }


   // Helper function that is used by the CurveLegend's accessibility object
   // to select a specific CurveLegend control. Specifically, this function is used
   // in the CurveLegend::CurveLegendAccessibleObject.Select function.
   void SelectChild( CurveLegend::CurveLegendAccessibleObject^ child, AccessibleSelection selection )
   {
      int childID = child->ID;
      
      // Determine which selection action should occur, based on the
      // AccessibleSelection value.
      if ( (selection & AccessibleSelection::TakeSelection) != (AccessibleSelection)0 )
      {
         for ( int i = 0; i < chartControl->Legends->Length; i++ )
         {
            if ( i == childID )
            {
               chartControl->Legends[ i ]->Selected = true;
            }
            else
            {
               chartControl->Legends[ i ]->Selected = false;
            }

         }
         
         // AccessibleSelection->AddSelection means that the CurveLegend will be selected.
         if ( (selection & AccessibleSelection::AddSelection) != (AccessibleSelection)0 )
         {
            chartControl->Legends[ childID ]->Selected = true;
         }
         
         // AccessibleSelection->AddSelection means that the CurveLegend will be unselected.
         if ( (selection & AccessibleSelection::RemoveSelection) != (AccessibleSelection)0 )
         {
            chartControl->Legends[ childID ]->Selected = false;
         }
      }
   }

};

// class ChartControlAccessibleObject
// Inner class ChartControlAccessibleObject represents accessible information associated with the ChartControl.
// The ChartControlAccessibleObject is returned in the ChartControl.CreateAccessibilityInstance override.
public class ChartControlAccessibleObject : ControlAccessibleObject
{
    ChartControl chartControl;

    public ChartControlAccessibleObject(ChartControl ctrl) : base(ctrl) 
    {
        chartControl = ctrl;
    }

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

    // Gets the state for the Chart. This is used by accessibility programs.
    public override AccessibleStates State
    {  
        get {                    
            return AccessibleStates.ReadOnly;
        }
    }

    // The CurveLegend objects are "child" controls in terms of accessibility so 
    // return the number of ChartLengend objects.
    public override int GetChildCount()
    {  
        return chartControl.Legends.Length;
    }

    // Gets the Accessibility object of the child CurveLegend idetified by index.
    public override AccessibleObject GetChild(int index)
    {  
        if (index >= 0 && index < chartControl.Legends.Length) {
            return chartControl.Legends[index].AccessibilityObject;
        }                
        return null;
    }

    // Helper function that is used by the CurveLegend's accessibility object
    // to navigate between sibiling controls. Specifically, this function is used in
    // the CurveLegend.CurveLegendAccessibleObject.Navigate function.
    internal AccessibleObject NavigateFromChild(CurveLegend.CurveLegendAccessibleObject child, 
                                                AccessibleNavigation navdir) 
    {  
        switch(navdir) {
            case AccessibleNavigation.Down:
            case AccessibleNavigation.Next:
                return GetChild(child.ID + 1);
                
            case AccessibleNavigation.Up:
            case AccessibleNavigation.Previous:
                return GetChild(child.ID - 1);                        
        }
        return null;
    }

    // Helper function that is used by the CurveLegend's accessibility object
    // to select a specific CurveLegend control. Specifically, this function is used
    // in the CurveLegend.CurveLegendAccessibleObject.Select function.
    internal void SelectChild(CurveLegend.CurveLegendAccessibleObject child, AccessibleSelection selection) 
    {   
        int childID = child.ID;

        // Determine which selection action should occur, based on the
        // AccessibleSelection value.
        if ((selection & AccessibleSelection.TakeSelection) != 0) {
            for(int i = 0; i < chartControl.Legends.Length; i++) {
                if (i == childID) {
                    chartControl.Legends[i].Selected = true;                        
                } else {
                    chartControl.Legends[i].Selected = false;
                }
            }

            // AccessibleSelection.AddSelection means that the CurveLegend will be selected.
            if ((selection & AccessibleSelection.AddSelection) != 0) {
                chartControl.Legends[childID].Selected = true;                        
            }

            // AccessibleSelection.AddSelection means that the CurveLegend will be unselected.
            if ((selection & AccessibleSelection.RemoveSelection) != 0) {
                chartControl.Legends[childID].Selected = false;                        
            }
        }            
    }
}
' Inner Class ChartControlAccessibleObject represents accessible information 
' associated with the ChartControl.
' The ChartControlAccessibleObject is returned in the         ' ChartControl.CreateAccessibilityInstance override.
Public Class ChartControlAccessibleObject
    Inherits Control.ControlAccessibleObject

    Private chartControl As ChartControl
    
    Public Sub New(ctrl As ChartControl)
        MyBase.New(ctrl)
        chartControl = ctrl
    End Sub
    
    ' Get the role for the Chart. This is used by accessibility programs.            
    Public Overrides ReadOnly Property Role() As AccessibleRole
        Get
            Return System.Windows.Forms.AccessibleRole.Chart
        End Get
    End Property
    
    ' Get the state for the Chart. This is used by accessibility programs.            
    Public Overrides ReadOnly Property State() As AccessibleStates
        Get
            Return AccessibleStates.ReadOnly
        End Get
    End Property                        
    
    ' The CurveLegend objects are "child" controls in terms of accessibility so 
    ' return the number of ChartLengend objects.            
    Public Overrides Function GetChildCount() As Integer
        Return chartControl.Legends.Length
    End Function 
    
    ' Get the Accessibility object of the child CurveLegend idetified by index.
    Public Overrides Function GetChild(index As Integer) As AccessibleObject
        If index >= 0 And index < chartControl.Legends.Length Then
            Return chartControl.Legends(index).AccessibilityObject
        End If
        Return Nothing
    End Function 
    
    ' Helper function that is used by the CurveLegend's accessibility object
    ' to navigate between sibiling controls. Specifically, this function is used in
    ' the CurveLegend.CurveLegendAccessibleObject.Navigate function.
    Friend Function NavigateFromChild(child As CurveLegend.CurveLegendAccessibleObject, _
                                    navdir As AccessibleNavigation) As AccessibleObject
        Select Case navdir
            Case AccessibleNavigation.Down, AccessibleNavigation.Next
                    Return GetChild(child.ID + 1)
            
            Case AccessibleNavigation.Up, AccessibleNavigation.Previous
                    Return GetChild(child.ID - 1)
        End Select
        Return Nothing
    End Function            

    ' Helper function that is used by the CurveLegend's accessibility object
    ' to select a specific CurveLegend control. Specifically, this function is used 
    ' in the CurveLegend.CurveLegendAccessibleObject.Select function.            
    Friend Sub SelectChild(child As CurveLegend.CurveLegendAccessibleObject, selection As AccessibleSelection)
        Dim childID As Integer = child.ID
        
        ' Determine which selection action should occur, based on the
        ' AccessibleSelection value.
        If (selection And AccessibleSelection.TakeSelection) <> 0 Then
            Dim i As Integer
            For i = 0 To chartControl.Legends.Length - 1
                If i = childID Then
                    chartControl.Legends(i).Selected = True
                Else
                    chartControl.Legends(i).Selected = False
                End If
            Next i
            
            ' AccessibleSelection.AddSelection means that the CurveLegend will be selected.
            If (selection And AccessibleSelection.AddSelection) <> 0 Then
                chartControl.Legends(childID).Selected = True
            End If

            ' AccessibleSelection.AddSelection means that the CurveLegend will be unselected.                    
            If (selection And AccessibleSelection.RemoveSelection) <> 0 Then
                chartControl.Legends(childID).Selected = False
            End If
        End If
    End Sub
End Class 'ChartControlAccessibleObject

注解

可访问对象可与一个或多个这些状态关联。An accessible object can be associated with one or more of these states.

有关辅助功能应用程序的详细信息, 请参阅 Microsoft Developer Network (MSDN) 库http://msdn.microsoft.com/library中的 "microsoft Active Accessibility"。For more information about the accessibility application, see "Microsoft Active Accessibility" in the Microsoft Developer Network (MSDN) library at http://msdn.microsoft.com/library.

适用于

另请参阅