browser_accessibility_state_impl.h | Explore in Territory

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_STATE_IMPL_H_
#define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_STATE_IMPL_H_

#include <memory>
#include <vector>

#include "base/time/time.h"
#include "components/metrics/metrics_provider.h"
#include "content/browser/accessibility/scoped_mode_collection.h"
#include "content/common/content_export.h"
#include "content/public/browser/browser_accessibility_state.h"
#include "content/public/browser/render_widget_host.h"
#include "ui/accessibility/ax_mode.h"
#include "ui/accessibility/platform/ax_platform.h"

namespace content {

struct FocusedNodeDetails;

// The BrowserAccessibilityState class is used to determine if Chrome should be
// customized for users with assistive technology, such as screen readers. We
// modify the behavior of certain user interfaces to provide a better experience
// for screen reader users. The way we detect a screen reader program is
// different for each platform.
//
// Screen Reader Detection
// (1) On Windows, many screen reader detection mechanisms will give false
//     positives, such as relying on the SPI_GETSCREENREADER system parameter.
//     In Chrome, we attempt to dynamically detect a MSAA client screen reader
//     by calling NotifyWinEvent in NativeWidgetWin with a custom ID and wait
//     to see if the ID is requested by a subsequent call to WM_GETOBJECT.
// (2) On macOS, we dynamically detect if VoiceOver is running by Key-Value
//     Observing changes to the "voiceOverEnabled" property in NSWorkspace. We
//     also monitor the undocumented accessibility attribute
//     @"AXEnhancedUserInterface", which is set by other assistive
//     technologies.
class CONTENT_EXPORT BrowserAccessibilityStateImpl
    : public BrowserAccessibilityState,
      public ui::AXPlatform::Delegate,
      public content::RenderWidgetHost::InputEventObserver { … };

}  // namespace content

#endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_STATE_IMPL_H_
chromium/content/browser/accessibility/browser_accessibility_state_impl.h
