Support chrome.windows extension API events for browserless Panels.

chrome/browser/extensions/window_event_router.h

+// 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.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_WINDOW_EVENT_ROUTER_H_
+#define CHROME_BROWSER_EXTENSIONS_WINDOW_EVENT_ROUTER_H_
+
+#include "base/basictypes.h"
+#include "chrome/browser/extensions/window_controller_list_observer.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#if defined(TOOLKIT_VIEWS)
+#include "ui/views/focus/widget_focus_manager.h"
+#elif defined(TOOLKIT_GTK)
+#include "ui/base/x/active_window_watcher_x_observer.h"
+#endif
+
+class Profile;
+
+namespace base {
+class ListValue;
+}
+
+namespace extensions {
+
+// The WindowEventRouter sends chrome.windows.* events to listeners
+// inside extension process renderers. The router listens to *all* events,
+// but will only route eventes within a profile to extension processes in the
+// same profile.
+class WindowEventRouter : public WindowControllerListObserver,
+#if defined(TOOLKIT_VIEWS)
+                          public views::WidgetFocusChangeListener,
+#elif defined(TOOLKIT_GTK)
+                          public ui::ActiveWindowWatcherXObserver,
+#endif
+                          public content::NotificationObserver {
+ public:
+  explicit WindowEventRouter(Profile* profile);
+  virtual ~WindowEventRouter();
+
+  // Must be called once. Subsequent calls have no effect.
+  void Init();
+
+  // WindowControllerListObserver methods:
+  virtual void OnWindowControllerAdded(
+      WindowController* window_controller) OVERRIDE;
+  virtual void OnWindowControllerRemoved(
+      WindowController* window) OVERRIDE;
+
+#if defined(TOOLKIT_VIEWS)
+  virtual void OnNativeFocusChange(gfx::NativeView focused_before,
+                                   gfx::NativeView focused_now) OVERRIDE;
+#elif defined(TOOLKIT_GTK)
+  virtual void ActiveWindowChanged(GdkWindow* active_window) OVERRIDE;
+#endif
+
+  // content::NotificationObserver.
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  // |window_controller| is NULL to indicate a focused window has lost focus.
+  void OnActiveWindowChanged(WindowController* window_controller);
+
+ private:
+  void DispatchEvent(const char* event_name,
+                     Profile* profile,
+                     base::ListValue* args);
+
+  content::NotificationRegistrar registrar_;
+  bool initialized_;
+
+  // The main profile that owns this event router.
+  Profile* profile_;
+
+  // The profile the currently focused window belongs to; either the main or
+  // incognito profile or NULL (none of the above). We remember this in order
+  // to correctly handle focus changes between non-OTR and OTR windows.
+  Profile* focused_profile_;
+
+  // The currently focused window. We keep this so as to avoid sending multiple
+  // windows.onFocusChanged events with the same windowId.
+  int focused_window_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(WindowEventRouter);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_WINDOW_EVENT_ROUTER_H_