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// Copyright (c) 2013 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_CHROMEOS_ACCESSIBILITY_ACCESSIBILITY_MANAGER_H_
#define CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_ACCESSIBILITY_MANAGER_H_
#include "ash/accessibility_delegate.h"
#include "base/prefs/pref_change_registrar.h"
#include "chrome/browser/chromeos/accessibility/accessibility_util.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
class Profile;
namespace chromeos {
struct AccessibilityStatusEventDetails {
AccessibilityStatusEventDetails(
bool enabled,
ash::AccessibilityNotificationVisibility notify);
AccessibilityStatusEventDetails(
bool enabled,
ash::MagnifierType magnifier_type,
ash::AccessibilityNotificationVisibility notify);
bool enabled;
ash::MagnifierType magnifier_type;
ash::AccessibilityNotificationVisibility notify;
};
// AccessibilityManager changes the statuses of accessibility features
// watching profile notifications and pref-changes.
// TODO(yoshiki): merge MagnificationManager with AccessibilityManager.
class AccessibilityManager : public content::NotificationObserver {
public:
// Creates an instance of AccessibilityManager, this should be called once,
// because only one instance should exist at the same time.
static void Initialize();
// Deletes the existing instance of AccessibilityManager.
static void Shutdown();
// Returns the existing instance. If there is no instance, returns NULL.
static AccessibilityManager* Get();
// On a user's first login into a device, any a11y features enabled/disabled
// by the user on the login screen are enabled/disabled in the user's profile.
// This class watches for profile changes and copies settings into the user's
// profile when it detects a login with a newly created profile.
class PrefHandler {
public:
explicit PrefHandler(const char* pref_path);
virtual ~PrefHandler();
// Should be called from AccessibilityManager::SetProfile().
void HandleProfileChanged(Profile* previous_profile,
Profile* current_profile);
private:
const char* pref_path_;
};
// Enables or disables the large cursor.
void EnableLargeCursor(bool enabled);
// Returns true if the large cursor is enabled, or false if not.
bool IsLargeCursorEnabled();
// Enables or disable Sticky Keys.
void EnableStickyKeys(bool enabled);
// Returns true if the Sticky Keys is enabled, or false if not.
bool IsStickyKeysEnabled();
// Enables or disables spoken feedback. Enabling spoken feedback installs the
// ChromeVox component extension.
void EnableSpokenFeedback(bool enabled,
ash::AccessibilityNotificationVisibility notify);
// Returns true if spoken feedback is enabled, or false if not.
bool IsSpokenFeedbackEnabled();
// Toggles whether Chrome OS spoken feedback is on or off.
void ToggleSpokenFeedback(ash::AccessibilityNotificationVisibility notify);
// Speaks the specified string.
void Speak(const std::string& text);
// Speaks the given text if the accessibility pref is already set.
void MaybeSpeak(const std::string& text);
// Enables or disables the high contrast mode for Chrome.
void EnableHighContrast(bool enabled);
// Returns true if High Contrast is enabled, or false if not.
bool IsHighContrastEnabled();
// Enables or disables autoclick.
void EnableAutoclick(bool enabled);
// Returns true if autoclick is enabled.
bool IsAutoclickEnabled();
// Set the delay for autoclicking after stopping the cursor in milliseconds.
void SetAutoclickDelay(int delay_ms);
// Returns the autoclick delay in milliseconds.
int GetAutoclickDelay() const;
void SetProfileForTest(Profile* profile);
protected:
AccessibilityManager();
virtual ~AccessibilityManager();
private:
void LoadChromeVox();
void LoadChromeVoxToUserScreen();
void LoadChromeVoxToLockScreen();
void UnloadChromeVox();
void UnloadChromeVoxFromLockScreen();
void UpdateLargeCursorFromPref();
void UpdateStickyKeysFromPref();
void UpdateSpokenFeedbackFromPref();
void UpdateHighContrastFromPref();
void UpdateAutoclickFromPref();
void UpdateAutoclickDelayFromPref();
void LocalePrefChanged();
void SetProfile(Profile* profile);
void UpdateChromeOSAccessibilityHistograms();
// content::NotificationObserver implementation:
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE;
// Profile which has the current a11y context.
Profile* profile_;
// Profile which ChromeVox is currently loaded to. If NULL, ChromeVox is not
// loaded to any profile.
bool chrome_vox_loaded_on_lock_screen_;
bool chrome_vox_loaded_on_user_screen_;
content::NotificationRegistrar notification_registrar_;
scoped_ptr<PrefChangeRegistrar> pref_change_registrar_;
scoped_ptr<PrefChangeRegistrar> local_state_pref_change_registrar_;
PrefHandler large_cursor_pref_handler_;
PrefHandler spoken_feedback_pref_handler_;
PrefHandler high_contrast_pref_handler_;
PrefHandler autoclick_pref_handler_;
PrefHandler autoclick_delay_pref_handler_;
bool large_cursor_enabled_;
bool sticky_keys_enabled_;
bool spoken_feedback_enabled_;
bool high_contrast_enabled_;
bool autoclick_enabled_;
int autoclick_delay_ms_;
ash::AccessibilityNotificationVisibility spoken_feedback_notification_;
DISALLOW_COPY_AND_ASSIGN(AccessibilityManager);
};
} // namespace chromeos
#endif // CHROME_BROWSER_CHROMEOS_ACCESSIBILITY_ACCESSIBILITY_MANAGER_H_
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