Improve omnibox accessibility on Windows.

chrome/browser/autocomplete/autocomplete_accessibility.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_ACCESSIBILITY_H_
-#define CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_ACCESSIBILITY_H_
-#pragma once
-
-#include <atlbase.h>
-#include <atlcom.h>
-#include <oleacc.h>
-
-#include "base/basictypes.h"
-#include "base/win/scoped_comptr.h"
-
-class OmniboxViewWin;
-
-////////////////////////////////////////////////////////////////////////////////
-//
-// AutocompleteAccessibility
-//
-// Class implementing the MSAA IAccessible COM interface for
-// OmniboxViewWin, providing accessibility to be used by screen
-// readers and other assistive technology (AT).
-//
-////////////////////////////////////////////////////////////////////////////////
-class ATL_NO_VTABLE AutocompleteAccessibility
-  : public CComObjectRootEx<CComMultiThreadModel>,
-    public IDispatchImpl<IAccessible, &IID_IAccessible, &LIBID_Accessibility> {
- public:
-  BEGIN_COM_MAP(AutocompleteAccessibility)
-    COM_INTERFACE_ENTRY2(IDispatch, IAccessible)
-    COM_INTERFACE_ENTRY(IAccessible)
-  END_COM_MAP()
-
-  AutocompleteAccessibility() {}
-  ~AutocompleteAccessibility() {}
-
-  HRESULT Initialize(const OmniboxViewWin* omnibox_view);
-
-  // Supported IAccessible methods.
-
-  // Retrieves the number of accessible children.
-  STDMETHODIMP get_accChildCount(LONG* child_count);
-
-  // Retrieves an IDispatch interface pointer for the specified child.
-  STDMETHODIMP get_accChild(VARIANT var_child, IDispatch** disp_child);
-
-  // Retrieves the IDispatch interface of the object's parent.
-  STDMETHODIMP get_accParent(IDispatch** disp_parent);
-
-  // Traverses to another UI element and retrieves the object.
-  STDMETHODIMP accNavigate(LONG nav_dir, VARIANT start, VARIANT* end);
-
-  // Retrieves the object that has the keyboard focus.
-  STDMETHODIMP get_accFocus(VARIANT* focus_child);
-
-  // Retrieves the name of the specified object.
-  STDMETHODIMP get_accName(VARIANT var_id, BSTR* name);
-
-  // Retrieves the tooltip description.
-  STDMETHODIMP get_accDescription(VARIANT var_id, BSTR* desc);
-
-  // Returns the current value of the edit box.
-  STDMETHODIMP get_accValue(VARIANT var_id, BSTR* value);
-
-  // Retrieves the current state of the specified object.
-  STDMETHODIMP get_accState(VARIANT var_id, VARIANT* state);
-
-  // Retrieves information describing the role of the specified object.
-  STDMETHODIMP get_accRole(VARIANT var_id, VARIANT* role);
-
-  // Retrieves a string that describes the object's default action.
-  STDMETHODIMP get_accDefaultAction(VARIANT var_id, BSTR* default_action);
-
-  // Retrieves the specified object's current screen location.
-  STDMETHODIMP accLocation(LONG* x_left, LONG* y_top, LONG* width, LONG* height,
-                           VARIANT var_id);
-
-  // Retrieves the child element or child object at a given point on the screen.
-  STDMETHODIMP accHitTest(LONG x_left, LONG y_top, VARIANT* child);
-
-  // Retrieves the specified object's shortcut.
-  STDMETHODIMP get_accKeyboardShortcut(VARIANT var_id, BSTR* access_key);
-
-  // Non-supported IAccessible methods.
-
-  // Out-dated and can be safely said to be very rarely used.
-  STDMETHODIMP accDoDefaultAction(VARIANT var_id);
-
-  // Selections not applicable to views.
-  STDMETHODIMP get_accSelection(VARIANT* selected);
-  STDMETHODIMP accSelect(LONG flags_sel, VARIANT var_id);
-
-  // Help functions not supported.
-  STDMETHODIMP get_accHelp(VARIANT var_id, BSTR* help);
-  STDMETHODIMP get_accHelpTopic(BSTR* help_file, VARIANT var_id,
-                                LONG* topic_id);
-
-  // Deprecated functions, not implemented here.
-  STDMETHODIMP put_accName(VARIANT var_id, BSTR put_name);
-  STDMETHODIMP put_accValue(VARIANT var_id, BSTR put_val);
-
- protected:
-  // A pointer containing the Windows' default IAccessible implementation for
-  // this object. Used where it is acceptable to return default MSAA
-  // information.
-  base::win::ScopedComPtr<IAccessible> default_accessibility_server_;
-
- private:
-  const OmniboxViewWin* omnibox_view_;
-
-  DISALLOW_COPY_AND_ASSIGN(AutocompleteAccessibility);
-};
-
-#endif  // CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_ACCESSIBILITY_H_