Rework ash::CursorManager into a corewm object, to share code with desktop.

ui/views/corewm/cursor_controller.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// 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 ASH_WM_CURSOR_MANAGER_H_
-#define ASH_WM_CURSOR_MANAGER_H_
+#ifndef UI_VIEWS_COREWM_CURSOR_CONTROLLER_H_
+#define UI_VIEWS_COREWM_CURSOR_CONTROLLER_H_
 
-#include "ash/ash_export.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/client/cursor_client.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/point.h"
+#include "ui/views/views_export.h"
 
-namespace ash {
+namespace views {
+namespace corewm {
 
 namespace internal {
 class CursorState;
 }
 
-namespace test {
-class CursorManagerTestApi;
-}
-
-class ImageCursors;
-
-// This class controls the visibility and the type of the cursor.
-// The cursor type can be locked so that the type stays the same
-// until it's unlocked.
-class ASH_EXPORT CursorManager : public aura::client::CursorClient {
+// This class controls the visibility and the type of the cursor.  The cursor
+// type can be locked so that the type stays the same until it's unlocked.
+class VIEWS_EXPORT CursorController : public aura::client::CursorClient {
  public:
-  CursorManager();
-  virtual ~CursorManager();
+  CursorController();
+  virtual ~CursorController();
 
   bool is_cursor_locked() const { return cursor_lock_count_ > 0; }
 
   // Overridden from aura::client::CursorClient:
   virtual void SetCursor(gfx::NativeCursor) OVERRIDE;
   virtual void ShowCursor() OVERRIDE;
   virtual void HideCursor() OVERRIDE;
   virtual bool IsCursorVisible() const OVERRIDE;
   virtual void EnableMouseEvents() OVERRIDE;
   virtual void DisableMouseEvents() OVERRIDE;
   virtual bool IsMouseEventsEnabled() const OVERRIDE;
-  virtual void SetDeviceScaleFactor(float device_scale_factor) OVERRIDE;
   virtual void LockCursor() OVERRIDE;
   virtual void UnlockCursor() OVERRIDE;
 
- private:
-  friend class test::CursorManagerTestApi;
-
-  void SetCursorInternal(gfx::NativeCursor cursor);
-  void SetCursorVisibility(bool visible);
-  void SetMouseEventsEnabled(bool enabled);
-
+ protected:
   // Returns the current cursor.
   gfx::NativeCursor GetCurrentCursor() const;
 
+  // Subclasses of CursorController control the actual assignment of cursors
+  // through the following template methods.
+
+  // Called to set the current cursor. Subclasses that need to set platform
+  // state should call the base method from their override after mutating their
+  // incoming cursor with their platform state.
+  virtual void SetCursorInternal(gfx::NativeCursor cursor);
+
+  // Called to set the visibility. Subclasses should call the base method first
+  // and then do platform visibility mutation.
+  virtual void SetCursorVisibility(bool visible);
+
+  // Called to set whether mouse events are enabled. Subclasses should call the
+  // base method first and then restore whatever state is necessary on their
+  // platform.
+  virtual void SetMouseEventsEnabled(bool enabled);
+
+ private:
   // Number of times LockCursor() has been invoked without a corresponding
   // UnlockCursor().
   int cursor_lock_count_;
 
-  // The cursor location where the cursor was disabled.
-  gfx::Point disabled_cursor_location_;
-
   // The current state of the cursor.
   scoped_ptr<internal::CursorState> current_state_;
 
   // The cursor state to restore when the cursor is unlocked.
   scoped_ptr<internal::CursorState> state_on_unlock_;
 
-  scoped_ptr<ImageCursors> image_cursors_;
-
-  DISALLOW_COPY_AND_ASSIGN(CursorManager);
+  DISALLOW_COPY_AND_ASSIGN(CursorController);
 };
 
-}  // namespace ash
+}  // namespace corewm
+}  // namespace views
 
-#endif  // UI_AURA_CURSOR_MANAGER_H_
+#endif  // UI_VIEWS_COREWM_CURSOR_CONTROLLER_H_