Support chrome.windows extension API events for browserless Panels.

chrome/browser/extensions/window_event_router.cc

Index: chrome/browser/extensions/window_event_router.cc
diff --git a/chrome/browser/extensions/window_event_router.cc b/chrome/browser/extensions/window_event_router.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3804d0cd472b7f3f6f2e41ac46feda88976a47dc
--- /dev/null
+++ b/chrome/browser/extensions/window_event_router.cc
@@ -0,0 +1,174 @@
+// Copyright (c) 2012 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/extensions/window_event_router.h"
+
+#include "base/json/json_writer.h"
+#include "base/values.h"
+#include "chrome/browser/extensions/event_names.h"
+#include "chrome/browser/extensions/event_router.h"
+#include "chrome/browser/extensions/extension_system.h"
+#include "chrome/browser/extensions/window_controller.h"
+#include "chrome/browser/extensions/window_controller_list.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/common/chrome_notification_types.h"
+#include "chrome/common/extensions/extension_constants.h"
+#include "content/public/browser/notification_service.h"
+
+#if defined(TOOLKIT_GTK)
+#include "ui/base/x/active_window_watcher_x.h"
+#endif
+
+namespace event_names = extensions::event_names;
+
+namespace extensions {
+
+WindowEventRouter::WindowEventRouter(Profile* profile)
+    : initialized_(false),
+      profile_(profile),
+      focused_profile_(NULL),
+      focused_window_id_(extension_misc::kUnknownWindowId) {
+  DCHECK(!profile->IsOffTheRecord());
+}
+
+WindowEventRouter::~WindowEventRouter() {
+  if (initialized_) {
+    WindowControllerList::GetInstance()->RemoveObserver(this);
+#if defined(TOOLKIT_VIEWS)
+    views::WidgetFocusManager::GetInstance()->RemoveFocusChangeListener(this);
+#elif defined(TOOLKIT_GTK)
+    ui::ActiveWindowWatcherX::RemoveObserver(this);
+#endif
+  }
+}
+
+void WindowEventRouter::Init() {
+  if (initialized_)
+    return;
+
+  WindowControllerList::GetInstance()->AddObserver(this);
+#if defined(TOOLKIT_VIEWS)
+  views::WidgetFocusManager::GetInstance()->AddFocusChangeListener(this);
+#elif defined(TOOLKIT_GTK)
+  ui::ActiveWindowWatcherX::AddObserver(this);
+#elif defined(OS_MACOSX)
+  // Needed for when no suitable window can be passed to an extension as the
+  // currently focused window.
+  registrar_.Add(this, chrome::NOTIFICATION_NO_KEY_WINDOW,
+                 content::NotificationService::AllSources());
+#endif
+
+  initialized_ = true;
+}
+
+void WindowEventRouter::OnWindowControllerAdded(
+    WindowController* window_controller) {
+  if (!profile_->IsSameProfile(window_controller->profile()))
+    return;
+
+  base::ListValue args;
+  DictionaryValue* window_dictionary = window_controller->CreateWindowValue();
+  args.Append(window_dictionary);
+  DispatchEvent(event_names::kOnWindowCreated, window_controller->profile(),
+                &args);
+}
+
+void WindowEventRouter::OnWindowControllerRemoved(
+    WindowController* window_controller) {
+  if (!profile_->IsSameProfile(window_controller->profile()))
+    return;
+
+  int window_id = window_controller->GetWindowId();
+  base::ListValue args;
+  args.Append(Value::CreateIntegerValue(window_id));
+  DispatchEvent(event_names::kOnWindowRemoved, window_controller->profile(),
+                &args);
+}
+
+#if defined(TOOLKIT_VIEWS)
+void WindowEventRouter::OnNativeFocusChange(
+    gfx::NativeView focused_before,
+    gfx::NativeView focused_now) {
+  if (!focused_now)
+    OnActiveWindowChanged(NULL);
+}
+#elif defined(TOOLKIT_GTK)
+void WindowEventRouter::ActiveWindowChanged(
+    GdkWindow* active_window) {
+  if (!active_window)
+    OnActiveWindowChanged(NULL);
+}
+#endif
+
+void WindowEventRouter::Observe(
+    int type,
+    const content::NotificationSource& source,
+    const content::NotificationDetails& details) {
+#if defined(OS_MACOSX)
+  if (chrome::NOTIFICATION_NO_KEY_WINDOW == type) {
+      OnActiveWindowChanged(NULL);
+      return;
+  }
+#endif
+}
+
+void WindowEventRouter::OnActiveWindowChanged(
+    WindowController* window_controller) {
+  Profile* window_profile = NULL;
+  int window_id = extension_misc::kUnknownWindowId;
+  if (window_controller &&
+      profile_->IsSameProfile(window_controller->profile())) {
+    window_profile = window_controller->profile();
+    window_id = window_controller->GetWindowId();
+  }
+
+  if (focused_window_id_ == window_id)
+    return;
+
+  // window_profile is either the default profile for the active window, its
+  // incognito profile, or NULL iff the previous profile is losing focus.
+  Profile* previous_focused_profile = focused_profile_;
+  focused_profile_ = window_profile;
+  focused_window_id_ = window_id;
+
+  base::ListValue real_args;
+  real_args.Append(Value::CreateIntegerValue(window_id));
+  std::string real_json_args;
+  base::JSONWriter::Write(&real_args, &real_json_args);
+
+  // When switching between windows in the default and incognitoi profiles,
+  // dispatch WINDOW_ID_NONE to extensions whose profile lost focus that
+  // can't see the new focused window across the incognito boundary.
+  // See crbug.com/46610.
+  std::string none_json_args;
+  if (focused_profile_ != NULL && previous_focused_profile != NULL &&
+      focused_profile_ != previous_focused_profile) {
+    ListValue none_args;
+    none_args.Append(
+        Value::CreateIntegerValue(extension_misc::kUnknownWindowId));
+    base::JSONWriter::Write(&none_args, &none_json_args);
+  }
+
+  if (!window_profile)
+    window_profile = previous_focused_profile;
+
+  ExtensionSystem::Get(window_profile)->event_router()->
+      DispatchEventsToRenderersAcrossIncognito(
+          event_names::kOnWindowFocusedChanged,
+          real_json_args,
+          window_profile,
+          none_json_args,
+          GURL());
+}
+
+void WindowEventRouter::DispatchEvent(const char* event_name,
+                                      Profile* profile,
+                                      base::ListValue* args) {
+  std::string json_args;
+  base::JSONWriter::Write(args, &json_args);
+  ExtensionSystem::Get(profile)->event_router()->
+      DispatchEventToRenderers(event_name, json_args, profile, GURL());
+}
+
+}  // namespace extensions