Full-screen Magnifier: Support warping the cursor on the edge

ui/aura/root_window.h

Index: ui/aura/root_window.h
diff --git a/ui/aura/root_window.h b/ui/aura/root_window.h
index ae90f549f6ad93ea022c9aaa9beca0091bbdbe3d..813597cb70dd1e9fa19ba9e32f7976c30aea746e 100644
--- a/ui/aura/root_window.h
+++ b/ui/aura/root_window.h
@@ -98,6 +98,7 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   Window* mouse_pressed_handler() { return mouse_pressed_handler_; }
   Window* capture_window() { return capture_window_; }
   Window* focused_window() { return focused_window_; }
+  ui::Layer* magnification_layer() { return magnification_layer_.get(); }
 
   // Initializes the root window.
   void Init();
@@ -121,6 +122,11 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   // used.
   void SetCursor(gfx::NativeCursor cursor);
 
+  // Hides the host cursor if true is set, regardless of ShowCursor(). This is
+  // used when chrome draws an alnative cursor instead. (cf. magnified cursor

[piman, 2012/05/18 03:09:49]

nit: s/alnative/alternative/

+  // for accessibility)

[piman, 2012/05/18 03:09:49]

nit: end with a period.

+  void SetForceHideCursor(bool hide);
+
   // Shows or hides the cursor.
   void ShowCursor(bool show);
 
@@ -351,6 +357,12 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
 
   scoped_ptr<RootWindowHost> host_;
 
+  // Layer for screen magnification. This layer doesn't transform location of
+  // mouse event. When the layer were transformed, the mouse pointer drawn by
+  // the host would indicate diffirent location and chrome should draw a
+  // software cursor instead of a hardware cursor by the host.
+  scoped_ptr<ui::Layer> magnification_layer_;
+
   // If set before the RootWindow is created, the cursor will be drawn within
   // the Aura root window but hidden outside of it, and it'll remain hidden
   // after the Aura window is closed.
@@ -399,6 +411,8 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   bool should_hold_mouse_moves_;
   scoped_ptr<MouseEvent> held_mouse_move_;
 
+  bool force_hide_cursor_;
+
   CompositorLock* compositor_lock_;
   bool draw_on_compositor_unlock_;