Keyboard Lock Host implementation

components/keyboard_lock/page_observer.cc

+// Copyright 2017 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 "components/keyboard_lock/page_observer.h"
+
+#include "base/callback.h"
+#include "base/logging.h"
+#include "base/message_loop/message_loop.h"
+#include "chrome/browser/chrome_notification_types.h"
+/* cycle dependency
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_finder.h"
+#include "chrome/browser/ui/exclusive_access/fullscreen_controller.h"
+*/
+#include "components/keyboard_lock/keyboard_lock_host.h"
+#include "components/keyboard_lock/key_hook_activator.h"
+#include "components/keyboard_lock/key_hook_activator_collection.h"
+#include "content/public/browser/notification_details.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/notification_source.h"
+#include "content/public/browser/web_contents.h"
+
+namespace keyboard_lock {
+
+// static
+void PageObserver::Observe(content::WebContents* web_contents,
+                           KeyHookActivatorCollection* collection) {
+  new PageObserver(web_contents, collection);
+}
+
+PageObserver::PageObserver(
+    content::WebContents* contents,
+    KeyHookActivatorCollection* collection)
+    : WebContentsObserver(contents),
+      collection_(collection) {
+  DCHECK(web_contents());
+  LOG(ERROR) << "PageObserver observes on thread " << base::PlatformThread::CurrentId();
+  // TODO(zijiehe): Cannot receive this notification.
+  is_fullscreen_ = true;
+  registrar_.Add(this,
+                 chrome::NOTIFICATION_FULLSCREEN_CHANGED,
+                 content::NotificationService::AllSources());
+  /* cycle dependency
+                 content::Source<FullscreenController>(
+                     chrome::FindBrowserWithWebContents(web_contents())
+                         ->exclusive_access_manager()
+                         ->fullscreen_controller()));
+  */
+}
+
+PageObserver::~PageObserver() {
+  collection_->Erase(web_contents());
+}
+
+void PageObserver::Observe(int type,
+                           const content::NotificationSource& source,
+                           const content::NotificationDetails& details) {
+  DCHECK_EQ(chrome::NOTIFICATION_FULLSCREEN_CHANGED, type);
+  is_fullscreen_ = *(content::Details<bool>(details).ptr());
+  LOG(ERROR) << "Received fullscreen notification: "
+             << (is_fullscreen_ ? "True" : "False");
+  TriggerActivator();
+}
+
+void PageObserver::OnWebContentsLostFocus() {
+  is_focused_ = false;
+  LOG(ERROR) << "Received OnWebContentsLostFocus";
+  TriggerActivator();
+}
+
+void PageObserver::OnWebContentsFocused() {
+  is_focused_ = true;
+  LOG(ERROR) << "Received OnWebContentsFocused";
+  TriggerActivator();
+}
+
+void PageObserver::WebContentsDestroyed() {
+  LOG(ERROR) << "Received WebContentsDestroyed";
+  KeyHookActivator* activator = collection_->Find(web_contents());
+  if (activator) {
+    activator->Deactivate(base::Callback<void(bool)>());
+  }
+  delete this;
+}
+
+void PageObserver::TriggerActivator() {
+  KeyHookActivator* activator = collection_->Find(web_contents());
+  if (activator == nullptr) {
+    LOG(ERROR) << "No KeyHookActivator found for WebContents "
+               << web_contents();
+    // The WebContents may be called CancelKeyboardLock(). This observer is not
+    // necessary anymore.
+    // "delete this" immediately stops all following callbacks.
+    delete this;
+    return;
+  }
+
+  if (is_fullscreen_ && is_focused_) {
+    LOG(ERROR) << "Going to Activate";
+    activator->Activate(base::Callback<void(bool)>());
+  } else {
+    LOG(ERROR) << "Going to Deactivate";
+    activator->Deactivate(base::Callback<void(bool)>());
+  }
+}
+
+}  // namespace keyboard_lock