1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef CONTENT_PUBLIC_BROWSER_BROWSER_ACCESSIBILITY_STATE_H_
6#define CONTENT_PUBLIC_BROWSER_BROWSER_ACCESSIBILITY_STATE_H_
7
8#include "base/callback_forward.h"
9
10#include "content/common/content_export.h"
11
12namespace content {
13
14// The BrowserAccessibilityState class is used to determine if the browser
15// should be customized for users with assistive technology, such as screen
16// readers.
17class CONTENT_EXPORT BrowserAccessibilityState {
18 public:
19  virtual ~BrowserAccessibilityState() { }
20
21  // Returns the singleton instance.
22  static BrowserAccessibilityState* GetInstance();
23
24  // Enables accessibility for all running tabs.
25  virtual void EnableAccessibility() = 0;
26
27  // Disables accessibility for all running tabs. (Only if accessibility is not
28  // required by a command line flag or by a platform requirement.)
29  virtual void DisableAccessibility() = 0;
30
31  // Resets accessibility to the platform default for all running tabs.
32  // This is probably off, but may be on, if --force_renderer_accessibility is
33  // passed, or EditableTextOnly if this is Win7.
34  virtual void ResetAccessibilityMode() = 0;
35
36  // Called when screen reader client is detected.
37  virtual void OnScreenReaderDetected() = 0;
38
39  // Returns true if the browser should be customized for accessibility.
40  virtual bool IsAccessibleBrowser() = 0;
41
42  // Add a callback method that will be called once, a small while after the
43  // browser starts up, when accessibility state histograms are updated.
44  // Use this to register a method to update additional accessibility
45  // histograms.
46  virtual void AddHistogramCallback(base::Closure callback) = 0;
47
48  virtual void UpdateHistogramsForTesting() = 0;
49};
50
51}  // namespace content
52
53#endif  // CONTENT_PUBLIC_BROWSER_BROWSER_ACCESSIBILITY_STATE_H_
54