Show ChromeVox caption panel when spoken feedback is enabled.

chrome/browser/chromeos/accessibility/accessibility_manager.cc

 // 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.
 
 #include "chrome/browser/chromeos/accessibility/accessibility_manager.h"
 
 #include "ash/audio/sounds.h"
 #include "ash/autoclick/autoclick_controller.h"
 #include "ash/high_contrast/high_contrast_controller.h"
 #include "ash/metrics/user_metrics_recorder.h"
 #include "ash/session/session_state_delegate.h"
+#include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shell.h"
 #include "ash/sticky_keys/sticky_keys_controller.h"
 #include "ash/system/tray/system_tray_notifier.h"
 #include "base/callback.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 #include "base/metrics/histogram.h"
 #include "base/path_service.h"
@@ skipping 241 matching lines @@
 
 void UnloadChromeVoxExtension(Profile* profile) {
   base::FilePath path = GetChromeVoxPath();
   ExtensionService* extension_service =
       extensions::ExtensionSystem::Get(profile)->extension_service();
   extension_service->component_loader()->Remove(path);
 }
 
 }  // namespace
 
+class ChromeVoxPanelWidgetObserver : public views::WidgetObserver {
+ public:
+  ChromeVoxPanelWidgetObserver(views::Widget* widget,
+                               AccessibilityManager* manager)
+      : widget_(widget), manager_(manager) {
+    widget_->AddObserver(this);
+  }
+
+  void OnWidgetClosing(views::Widget* widget) override {
+    CHECK_EQ(widget_, widget);
+    widget->RemoveObserver(this);
+    manager_->OnChromeVoxPanelClosing();
+  }
+
+  void OnWidgetDestroying(views::Widget* widget) override {
+    CHECK_EQ(widget_, widget);
+    widget->RemoveObserver(this);
+    manager_->OnChromeVoxPanelDestroying();
+  }
+
+ private:
+  views::Widget* widget_;
+  AccessibilityManager* manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeVoxPanelWidgetObserver);
+};
+
 ///////////////////////////////////////////////////////////////////////////////
 // AccessibilityStatusEventDetails
 
 AccessibilityStatusEventDetails::AccessibilityStatusEventDetails(
     AccessibilityNotificationType notification_type,
     bool enabled,
     ui::AccessibilityNotificationVisibility notify)
   : notification_type(notification_type),
     enabled(enabled),
     magnifier_type(ui::kDefaultMagnifierType),
@@ skipping 87 matching lines @@
       high_contrast_enabled_(false),
       autoclick_enabled_(false),
       autoclick_delay_ms_(ash::AutoclickController::kDefaultAutoclickDelayMs),
       virtual_keyboard_enabled_(false),
       spoken_feedback_notification_(ui::A11Y_NOTIFICATION_NONE),
       should_speak_chrome_vox_announcements_on_user_screen_(true),
       system_sounds_enabled_(false),
       braille_display_connected_(false),
       scoped_braille_observer_(this),
       braille_ime_current_(false),
+      chromevox_panel_(nullptr),
       weak_ptr_factory_(this) {
   notification_registrar_.Add(this,
                               chrome::NOTIFICATION_LOGIN_OR_LOCK_WEBUI_VISIBLE,
                               content::NotificationService::AllSources());
   notification_registrar_.Add(this,
                               chrome::NOTIFICATION_SESSION_STARTED,
                               content::NotificationService::AllSources());
   notification_registrar_.Add(this,
                               chrome::NOTIFICATION_PROFILE_DESTROYED,
                               content::NotificationService::AllSources());
@@ skipping 22 matching lines @@
 }
 
 AccessibilityManager::~AccessibilityManager() {
   CHECK(this == g_accessibility_manager);
   AccessibilityStatusEventDetails details(
       ACCESSIBILITY_MANAGER_SHUTDOWN,
       false,
       ui::A11Y_NOTIFICATION_NONE);
   NotifyAccessibilityStatusChanged(details);
   input_method::InputMethodManager::Get()->RemoveObserver(this);
+
+  if (chromevox_panel_) {
+    chromevox_panel_->Close();
+    chromevox_panel_ = nullptr;
+  }
 }
 
 bool AccessibilityManager::ShouldShowAccessibilityMenu() {
   // If any of the loaded profiles has an accessibility feature turned on - or
   // enforced to always show the menu - we return true to show the menu.
   std::vector<Profile*> profiles =
       g_browser_process->profile_manager()->GetLoadedProfiles();
   for (std::vector<Profile*>::iterator it = profiles.begin();
        it != profiles.end();
        ++it) {
@@ skipping 197 matching lines @@
       chrome_vox_loaded_on_lock_screen_ = true;
       LoadChromeVoxExtension(
           profile,
           lock_web_ui->GetWebContents()->GetRenderViewHost(),
           done_cb);
     }
   }
 }
 
 void AccessibilityManager::UnloadChromeVox() {
+  if (chromevox_panel_) {
+    chromevox_panel_->Close();
+    chromevox_panel_ = nullptr;
+  }
+
   if (chrome_vox_loaded_on_lock_screen_)
     UnloadChromeVoxFromLockScreen();
 
   if (chrome_vox_loaded_on_user_screen_) {
     UnloadChromeVoxExtension(profile_);
     chrome_vox_loaded_on_user_screen_ = false;
   }
 
   PostUnloadChromeVox(profile_);
 }
@@ skipping 482 matching lines @@
         extensions::events::ACCESSIBILITY_PRIVATE_ON_INTRODUCE_CHROME_VOX,
         extensions::api::accessibility_private::OnIntroduceChromeVox::
             kEventName,
         event_args.Pass()));
     event_router->DispatchEventWithLazyListener(
         extension_misc::kChromeVoxExtensionId, event.Pass());
   }
 
   should_speak_chrome_vox_announcements_on_user_screen_ =
       chrome_vox_loaded_on_lock_screen_;
+
+  if (!chromevox_panel_) {
+    chromevox_panel_ = new ChromeVoxPanel(profile_);
+    chromevox_panel_widget_observer_.reset(
+        new ChromeVoxPanelWidgetObserver(chromevox_panel_->GetWidget(), this));
+  }
 }
 
 void AccessibilityManager::PostUnloadChromeVox(Profile* profile) {
   // Do any teardown work needed immediately after ChromeVox actually unloads.
   ash::PlaySystemSoundAlways(SOUND_SPOKEN_FEEDBACK_DISABLED);
   // Clear the accessibility focus ring.
   AccessibilityFocusRingController::GetInstance()->SetFocusRing(
       std::vector<gfx::Rect>());
 }
 
+void AccessibilityManager::OnChromeVoxPanelClosing() {
+  aura::Window* root_window = chromevox_panel_->GetRootWindow();
+  chromevox_panel_widget_observer_.reset(nullptr);
+  chromevox_panel_ = nullptr;
+  ash::ShelfLayoutManager::ForShelf(root_window)->SetChromeVoxPanelHeight(0);
+}
+
+void AccessibilityManager::OnChromeVoxPanelDestroying() {
+  chromevox_panel_widget_observer_.reset(nullptr);
+  chromevox_panel_ = nullptr;
+}
+
 }  // namespace chromeos