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

ui/aura/root_window.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 UI_AURA_ROOT_WINDOW_H_
 #define UI_AURA_ROOT_WINDOW_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 80 matching lines @@
     return hide_host_cursor_;
   }
 
   ui::Compositor* compositor() { return compositor_.get(); }
   gfx::Point last_mouse_location() const { return last_mouse_location_; }
   gfx::NativeCursor last_cursor() const { return last_cursor_; }
   bool cursor_shown() const { return cursor_shown_; }
   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();
 
   // Shows the root window host.
   void ShowRootWindow();
 
   // Sets the size of the root window.
   void SetHostSize(const gfx::Size& size_in_pixel);
   gfx::Size GetHostSize() const;
 
   // Sets the bounds of the host window.
   void SetHostBounds(const gfx::Rect& size_in_pixel);
 
   // Returns where the RootWindow is on screen.
   gfx::Point GetHostOrigin() const;
 
   // Sets the currently-displayed cursor. If the cursor was previously hidden
   // via ShowCursor(false), it will remain hidden until ShowCursor(true) is
   // called, at which point the cursor that was last set via SetCursor() will be
   // 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);
 
   // Moves the cursor to the specified location relative to the root window.
   void MoveCursorTo(const gfx::Point& location);
 
   // Clips the cursor movement to |capture_window_|. Should be invoked only
   // after SetCapture(). ReleaseCapture() implicitly removes any confines set
   // using this function. Returns true if successful.
   bool ConfineCursorToWindow();
@@ skipping 210 matching lines @@
   // current mouse location.
   void SynthesizeMouseMoveEvent();
 
   // Called by CompositorLock.
   void UnlockCompositor();
 
   scoped_ptr<ui::Compositor> compositor_;
 
   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.
   static bool hide_host_cursor_;
 
   // Used to schedule painting.
   base::WeakPtrFactory<RootWindow> schedule_paint_factory_;
 
   // Use to post mouse move event.
   base::WeakPtrFactory<RootWindow> event_factory_;
@@ skipping 28 matching lines @@
   bool draw_on_compositing_end_;
 
   bool defer_draw_scheduling_;
 
   // How many holds are outstanding. We try to defer dispatching mouse moves
   // while the count is > 0.
   int mouse_move_hold_count_;
   bool should_hold_mouse_moves_;
   scoped_ptr<MouseEvent> held_mouse_move_;
 
+  bool force_hide_cursor_;
+
   CompositorLock* compositor_lock_;
   bool draw_on_compositor_unlock_;
 
   int draw_trace_count_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindow);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_ROOT_WINDOW_H_