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 12 namespace 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. 17 class 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. 28 virtual void DisableAccessibility() = 0; 29 30 // Called when screen reader client is detected. 31 virtual void OnScreenReaderDetected() = 0; 32 33 // Returns true if the browser should be customized for accessibility. 34 virtual bool IsAccessibleBrowser() = 0; 35 36 // Add a callback method that will be called once, a small while after the 37 // browser starts up, when accessibility state histograms are updated. 38 // Use this to register a method to update additional accessibility 39 // histograms. 40 virtual void AddHistogramCallback(base::Closure callback) = 0; 41 42 virtual void UpdateHistogramsForTesting() = 0; 43 }; 44 45 } // namespace content 46 47 #endif // CONTENT_PUBLIC_BROWSER_BROWSER_ACCESSIBILITY_STATE_H_ 48
