Aura: Switch window mode when screen resolution changes

ash/shell.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 ASH_SHELL_H_
 #define ASH_SHELL_H_
 #pragma once
 
 #include <utility>
 #include <vector>
 
 #include "ash/ash_export.h"
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
+#include "ui/aura/root_window_observer.h"
 
 class CommandLine;
 
 namespace aura {
 class EventFilter;
 class RootWindow;
 class Window;
 }
 namespace gfx {
 class Point;
@@ skipping 27 matching lines @@
 class VisibilityController;
 class WindowModalityController;
 class WorkspaceController;
 }
 
 // Shell is a singleton object that presents the Shell API and implements the
 // RootWindow's delegate interface.
 //
 // Upon creation, the Shell sets itself as the RootWindow's delegate, which
 // takes ownership of the Shell.
-class ASH_EXPORT Shell {
+class ASH_EXPORT Shell : public aura::RootWindowObserver {
  public:
   // In compact window mode we fill the screen with a single maximized window,
   // similar to ChromeOS R17 and earlier.  In overlapping mode we have draggable
   // windows.  In managed mode the workspace arranges windows for the user.
   enum WindowMode {
     MODE_COMPACT,
     MODE_MANAGED,
     MODE_OVERLAPPING,
   };
 
@@ skipping 57 matching lines @@
 
   ShellDelegate* delegate() { return delegate_.get(); }
 
   Launcher* launcher() { return launcher_.get(); }
 
   // Made available for tests.
   internal::ShadowController* shadow_controller() {
     return shadow_controller_.get();
   }
 
+  // aura::RootWindowObserver overrides:
+  virtual void OnRootWindowResized(const gfx::Size& new_size) OVERRIDE;
+
  private:
   FRIEND_TEST_ALL_PREFIXES(ShellTest, ComputeWindowMode);
   FRIEND_TEST_ALL_PREFIXES(ShellTest, ChangeWindowMode);
 
   typedef std::pair<aura::Window*, gfx::Rect> WindowAndBoundsPair;
 
   explicit Shell(ShellDelegate* delegate);
   virtual ~Shell();
 
   void Init();
@@ skipping 51 matching lines @@
 
   // Status area with clock, Wi-Fi signal, etc.
   views::Widget* status_widget_;
 
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_H_