Implement overscroll support for the virtual keyboard.

ui/keyboard/keyboard_controller.h

 // Copyright (c) 2013 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 UI_KEYBOARD_KEYBOARD_CONTROLLER_H_
 #define UI_KEYBOARD_KEYBOARD_CONTROLLER_H_
 
 #include "base/basictypes.h"
 #include "base/event_types.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
+#include "ui/aura/client/virtual_keyboard_client.h"
 #include "ui/aura/window_observer.h"
 #include "ui/base/ime/input_method_observer.h"
 #include "ui/base/ime/text_input_type.h"
 #include "ui/keyboard/keyboard_export.h"
 #include "url/gurl.h"
 
 namespace aura {
 class Window;
+namespace client {
+class VirtualKeyboardObserver;
+}
 }
 namespace gfx {
 class Rect;
 }
 namespace ui {
 class InputMethod;
 class TextInputClient;
 }
 
 namespace keyboard {
 
 class CallbackAnimationObserver;
 class KeyboardControllerObserver;
 class KeyboardControllerProxy;
 
 // Provides control of the virtual keyboard, including providing a container
 // and controlling visibility.
-class KEYBOARD_EXPORT KeyboardController : public ui::InputMethodObserver,
-                                           public aura::WindowObserver {
+class KEYBOARD_EXPORT KeyboardController
+    : public ui::InputMethodObserver,
+      public aura::WindowObserver,
+      public aura::client::VirtualKeyboardClient {
  public:
   // Different ways to hide the keyboard.
   enum HideReason {
     // System initiated.
     HIDE_REASON_AUTOMATIC,
     // User initiated.
     HIDE_REASON_MANUAL,
   };
 
   // Takes ownership of |proxy|.
@@ skipping 14 matching lines @@
 
   // Hides virtual keyboard and notifies observer bounds change.
   // This function should be called with a delay to avoid layout flicker
   // when the focus of input field quickly change. |automatic| is true when the
   // call is made by the system rather than initiated by the user.
   void HideKeyboard(HideReason reason);
 
   // Notifies the keyboard observer for keyboard bounds changed.
   void NotifyKeyboardBoundsChanging(const gfx::Rect& new_bounds);
 
-  // Management of the observer list.
-  virtual void AddObserver(KeyboardControllerObserver* observer);
-  virtual void RemoveObserver(KeyboardControllerObserver* observer);
+  // Overridden from aura::client::VirtualKeyboardClient:
+  virtual void AddObserver(aura::client::VirtualKeyboardObserver* observer)
+      OVERRIDE;
+  virtual void RemoveObserver(aura::client::VirtualKeyboardObserver* observer)
+      OVERRIDE;
+  virtual bool IsOverscrollEnabled() OVERRIDE;
 
   KeyboardControllerProxy* proxy() { return proxy_.get(); }
 
   void set_lock_keyboard(bool lock) { lock_keyboard_ = lock; }
 
   // Force the keyboard to show up if not showing and lock the keyboard.
   void ShowAndLockKeyboard();
 
  private:
   // For access to Observer methods for simulation.
@@ skipping 31 matching lines @@
   scoped_ptr<aura::Window> container_;
   // CallbackAnimationObserver should destructed before container_ because it
   // uses container_'s animator.
   scoped_ptr<CallbackAnimationObserver> animation_observer_;
 
   ui::InputMethod* input_method_;
   bool keyboard_visible_;
   bool lock_keyboard_;
   ui::TextInputType type_;
 
-  ObserverList<KeyboardControllerObserver> observer_list_;
+  ObserverList<aura::client::VirtualKeyboardObserver> observer_list_;
 
   base::WeakPtrFactory<KeyboardController> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(KeyboardController);
 };
 
 }  // namespace keyboard
 
 #endif  // UI_KEYBOARD_KEYBOARD_CONTROLLER_H_