Enable WebUI ScreenLocker for aura by abstracting lock window.

chrome/browser/chromeos/login/lock_window_gtk.h

+// Copyright (c) 2011 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_LOGIN_LOCK_WINDOW_GTK_H_
+#define CHROME_BROWSER_CHROMEOS_LOGIN_LOCK_WINDOW_GTK_H_
+#pragma once
+
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/chromeos/login/lock_window.h"
+#include "chrome/browser/chromeos/login/screen_locker_delegate.h"
+#include "ui/views/widget/native_widget_gtk.h"
+
+namespace chromeos {
+
+// A ScreenLock window that covers entire screen to keep the keyboard
+// focus/events inside the grab widget.
+class LockWindowGtk : public views::NativeWidgetGtk,
+                      public LockWindow {
+ public:
+  // LockWindow implementation:
+  virtual void Grab(DOMView* dom_view) OVERRIDE;
+  virtual views::Widget* GetWidget() OVERRIDE;
+
+ protected:
+  // NativeWidgetGtk overrides:
+  virtual gboolean OnButtonPress(GtkWidget* widget,
+                                 GdkEventButton* event) OVERRIDE;
+  virtual void OnDestroy(GtkWidget* object) OVERRIDE;
+  virtual void ClearNativeFocus() OVERRIDE;
+  virtual void HandleGtkGrabBroke() OVERRIDE;
+
+ private:
+  friend class LockWindow;
+
+  LockWindowGtk();
+  virtual ~LockWindowGtk();
+
+  // Initialize the lock window.
+  void Init();
+
+  // Called when the window manager is ready to handle locked state.
+  void OnWindowManagerReady();
+
+  // Called when the all inputs are grabbed.
+  void OnGrabInputs();
+
+  // Clear current GTK grab.
+  void ClearGtkGrab();
+
+  // Try to grab all inputs. It initiates another try if it fails to
+  // grab and the retry count is within a limit, or fails with CHECK.
+  void TryGrabAllInputs();
+
+  // This method tries to steal pointer/keyboard grab from other
+  // client by sending events that will hopefully close menus or windows
+  // that have the grab.
+  void TryUngrabOtherClients();
+
+  // Event handler for client-event.
+  CHROMEGTK_CALLBACK_1(LockWindowGtk, void, OnClientEvent, GdkEventClient*)
+
+  // The screen locker window.
+  views::Widget* lock_window_;
+
+  // The widget to grab inputs on. This is initialized by Grab to be the
+  // RenderHostView displaying the WebUI.
+  GtkWidget* grab_widget_;
+
+  // True if the screen locker's window has been drawn.
+  bool drawn_;
+
+  // True if both mouse input and keyboard input are grabbed.
+  bool input_grabbed_;
+
+  base::WeakPtrFactory<LockWindowGtk> weak_factory_;
+
+  // The number times the widget tried to grab all focus.
+  int grab_failure_count_;
+
+  // Status of keyboard and mouse grab.
+  GdkGrabStatus kbd_grab_status_;
+  GdkGrabStatus mouse_grab_status_;
+
+  DISALLOW_COPY_AND_ASSIGN(LockWindowGtk);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_LOCK_WINDOW_GTK_H_