用于自定义控件的AccessibleObject实现 [英] AccessibleObject implementation for custom controls

问题描述

我有一个非常简单的Windows窗体控件库，在实现可访问性时遇到问题。

I have a very simple controls library for Windows Forms and I am getting problems to implement accessibility.

我有一个非常简单的Form，其成员包含我的库的控件列表，并且我重写了CreateAccessibilityInstance：

I have a very simple Form with a member that contains a list of controls of my library, and I have overriden the CreateAccessibilityInstance:

public partial class Form1 : Form
{
    protected override AccessibleObject CreateAccessibilityInstance()
    {
        return new AccessibleForm(this);
    }

    public MyContainer MyContainer;

    public Form1()
    {
        InitializeComponent();
        MyContainer = new MyContainer();
        MyContainer.Controls.Add(new MyButton());
    }
}

AccessibleForm类如下：

The AccessibleForm class looks like:

public class AccessibleForm: Control.ControlAccessibleObject
{
    private Form1 form1;

    public AccessibleForm(Form1 owner):base(owner)
    {
        this.form1 = owner;
    }

    public override AccessibleObject GetChild(int index)
    {
        return this.form1.MyContainer.Controls[index].AccessibilityObject;
    }

    public override int GetChildCount()
    {
        return this.form1.MyContainer.Controls.Count() ;
    }
}

MyContanier和MyButton类继承自BaseControl，它们非常简单：

MyContanier and MyButton classes inherits from BaseControl, they are very easy:

public class BaseControl : Control
{
    protected override AccessibleObject CreateAccessibilityInstance()
    {
        return new AccessibleObject();
    }
}


public class MyContainer:BaseControl
{
    public List<BaseControl> Controls { get; set; }

    public MyContainer()
    {
        this.Controls = new List<BaseControl>();
    }
}

public class MyButton:BaseControl
{        
}

重点是，当我运行UIVerify工具查看控件是否生成正确的结构时，我看不到它们：

The point is that when I run the UIVerify tool to see if my controls are generating the correct structure I can not see them:

另一点是，如果我以这种方式修改AccessibleForm类的GetChild方法：

Another point is, that if I modify the GetChild method from AccessibleForm class in this way:

public override AccessibleObject GetChild(int index)
{
    return new AccessibleObject();
    ////return this.form1.MyContainer.Controls[index].AccessibilityObject;
}

我可以在UIVerify上看到一个节点：

I can see a node on the UIVerify:

但是修改GetChild方法以返回自定义可访问对象不会显示任何内容。

But modifying the GetChild method to return a custom accessible object it shows me nothing.

为什么我的控件不在树上？

Why are not my controls on the tree?

我不知道自己缺少什么。 p>

I do not know what I am missing.

推荐答案

覆盖AccessibleForm类中的名称，值，作用

Override Name,value,Role in AccessibleForm class

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