Enabling access notifications for login wizard

chrome/browser/chromeos/login/wizard_accessibility_helper.cc

 // Copyright (c) 2010 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/login/wizard_accessibility_helper.h"
 
 #include "base/logging.h"
+#include "base/stl_util-inl.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_accessibility_api.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profile.h"
 #include "chrome/browser/profile_manager.h"
 #include "chrome/common/notification_registrar.h"
 #include "chrome/common/notification_service.h"
 #include "chrome/common/pref_names.h"
+#include "views/accelerator.h"
+#include "views/view.h"
+
+scoped_ptr<views::Accelerator> WizardAccessibilityHelper::accelerator_;
+
+// static
+views::Accelerator WizardAccessibilityHelper::GetAccelerator() {
+  if (!WizardAccessibilityHelper::accelerator_.get())
+    WizardAccessibilityHelper::accelerator_.reset(
+        new views::Accelerator(app::VKEY_Z, false, true, true));
+  return *(WizardAccessibilityHelper::accelerator_.get());

[Nico, 2011/11/21 04:13:47]

Why not just

  return views::Accelerator(app:VKEY_Z, false, true, true);

? I'm about to make that change; shout if that's wrong for some reason.

+}
 
 // static
 WizardAccessibilityHelper* WizardAccessibilityHelper::GetInstance() {
   return Singleton<WizardAccessibilityHelper>::get();
 }
 
 WizardAccessibilityHelper::WizardAccessibilityHelper() {
   accessibility_handler_.reset(new WizardAccessibilityHandler());
+  profile_ = ProfileManager::GetDefaultProfile();
   registrar_.Add(accessibility_handler_.get(),
                  NotificationType::ACCESSIBILITY_CONTROL_FOCUSED,
                  NotificationService::AllSources());
   registrar_.Add(accessibility_handler_.get(),
                  NotificationType::ACCESSIBILITY_CONTROL_ACTION,
                  NotificationService::AllSources());
   registrar_.Add(accessibility_handler_.get(),
                  NotificationType::ACCESSIBILITY_TEXT_CHANGED,
                  NotificationService::AllSources());
   registrar_.Add(accessibility_handler_.get(),
                  NotificationType::ACCESSIBILITY_MENU_OPENED,
                  NotificationService::AllSources());
   registrar_.Add(accessibility_handler_.get(),
                  NotificationType::ACCESSIBILITY_MENU_CLOSED,
                  NotificationService::AllSources());
 }
 
 void WizardAccessibilityHelper::MaybeEnableAccessibility(
-    views::View* view_tree, Profile* profile) {
-  if (g_browser_process != NULL &&
+    views::View* view_tree) {
+  if (g_browser_process &&
       g_browser_process->local_state()->GetBoolean(
           prefs::kAccessibilityEnabled)) {
-      EnableAccessibility(view_tree, profile);
+      EnableAccessibility(view_tree);
+  } else {
+    AddViewToBuffer(view_tree);
   }
 }
 
-void WizardAccessibilityHelper::EnableAccessibility(
-    views::View* view_tree, Profile* profile) {
+void WizardAccessibilityHelper::MaybeSpeak(const char* str, bool queue,
+    bool interruptible) {
+  if (g_browser_process &&
+      g_browser_process->local_state()->GetBoolean(
+          prefs::kAccessibilityEnabled)) {
+    accessibility_handler_->Speak(str, queue, interruptible);
+  }
+}
+
+void WizardAccessibilityHelper::EnableAccessibility(views::View* view_tree) {
   LOG(INFO) << "Enabling accessibility.";
-  if (g_browser_process != NULL) {
+  if (g_browser_process) {
     PrefService* prefService = g_browser_process->local_state();
     if (!prefService->GetBoolean(prefs::kAccessibilityEnabled)) {
       prefService->SetBoolean(prefs::kAccessibilityEnabled, true);
       prefService->ScheduleSavePersistentPrefs();
     }
   }
   ExtensionAccessibilityEventRouter::GetInstance()->
       SetAccessibilityEnabled(true);
-  accessible_view_helper_.reset(new AccessibleViewHelper(
-      view_tree, profile));
+  AddViewToBuffer(view_tree);
+  // If accessibility pref is set, enable accessibility for all views in
+  // the buffer for which access is not yet enabled.
+  for (std::map<views::View*, bool>::iterator iter =
+      views_buffer_.begin();
+      iter != views_buffer_.end(); ++iter) {
+    if (!(*iter).second) {
+      AccessibleViewHelper *helper = new AccessibleViewHelper((*iter).first,
+          profile_);
+      accessible_view_helpers_.push_back(helper);
+      (*iter).second = true;
+    }
+  }
 }
+
+void WizardAccessibilityHelper::AddViewToBuffer(views::View* view_tree) {
+  if (!view_tree->GetWidget())
+    return;
+  bool view_exists = false;
+  // Check if the view is already queued for enabling accessibility.
+  // Prevent adding the same view in the buffer twice.
+  for (std::map<views::View*, bool>::iterator iter = views_buffer_.begin();
+      iter != views_buffer_.end(); ++iter) {
+    if ((*iter).first == view_tree) {
+      view_exists = true;
+      break;
+    }
+  }
+  if (!view_exists)
+    views_buffer_[view_tree] = false;
+}