Screensaver at login screen.

chrome/browser/chromeos/ui/screensaver_extension_dialog.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_CHROMEOS_UI_SCREENSAVER_EXTENSION_DIALOG_H_
+#define CHROME_BROWSER_CHROMEOS_UI_SCREENSAVER_EXTENSION_DIALOG_H_
+#pragma once
+
+#include "base/memory/ref_counted.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/views/extensions/extension_dialog_observer.h"
+
+class Extension;
+class ExtensionDialog;
+
+namespace browser {
+
+void ShowScreensaverDialog();
+void CloseScreensaverDialog();
+
+}  // namespace browser
+
+// Shows or hides the screensaver extension in fullscreen mode on
+// top of all other windows.
+class ScreensaverExtensionDialog
+    : public ExtensionDialogObserver {
+ public:
+  static void ShowScreensaverDialog();
+  static void CloseScreensaverDialog();
+
+  // ExtensionDialog::Observer implementation.
+  virtual void ExtensionDialogClosing(ExtensionDialog* dialog) OVERRIDE;
+  virtual void ExtensionTerminated(ExtensionDialog* dialog) OVERRIDE;
+
+ protected:
+  // ScreensaverDialog implementation.
+  virtual void Show() OVERRIDE;
+  virtual void Close() OVERRIDE;
+
+ private:
+  friend class ScreensaverExtensionDialogBrowserTest;
+  friend class ScreensaverExtensionDialogTest;
+
+  ScreensaverExtensionDialog();
+  virtual ~ScreensaverExtensionDialog();
+
+  // Load the screensaver extension.
+  void LoadExtension();
+  // Callback to set the extension and show the dialog.
+  // Called from LoadExtension.
+  void SetExtensionAndShow(scoped_refptr<Extension> extension);
+  // Reload the screensaver extension and show another screensaver dialog.
+  void ReloadAndShow();
+
+  scoped_refptr<Extension> screensaver_extension_;
+  // Host for the extension that implements this dialog.
+  scoped_refptr<ExtensionDialog> extension_dialog_;
+
+  // Set while we're loading an extension; only touched from the UI thread.
+  bool loading_extension_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScreensaverExtensionDialog);
+};
+
+#endif  // CHROME_BROWSER_CHROMEOS_UI_SCREENSAVER_EXTENSION_DIALOG_H_