Implement cursor compositing mode on Ash

ash/display/cursor_window_controller.h

+// Copyright 2014 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_DISPLAY_CURSOR_WINDOW_CONTROLLER_H_
+#define ASH_DISPLAY_CURSOR_WINDOW_CONTROLLER_H_
+
+#include "ui/aura/window.h"
+#include "ui/base/cursor/cursor.h"
+#include "ui/gfx/display.h"
+
+namespace ash {
+namespace test{
+class MirrorWindowTestApi;
+}
+
+namespace internal {
+
+class CursorWindowDelegate;
+
+// Draws a mouse cursor on a given container window.
+// When cursor compositing is disabled, CursorWindowController is responsible
+// to scale and rotate the mouse cursor bitmap to match settings of the
+// primary display.
+// When cursor compositing is enabled, just draw the cursor as-is.
+class CursorWindowController {
+ public:
+  CursorWindowController();
+  ~CursorWindowController();
+
+  bool is_cursor_compositing_enabled() const {
+    return is_cursor_compositing_enabled_;
+  }
+
+  // Sets cursor compositing mode on/off.
+  void SetCursorCompositingEnabled(bool enabled);
+
+  // Updates the container window for the cursor window controller.
+  void UpdateContainer();
+
+  // Sets the display on which to draw cursor.
+  // Only applicable when cursor compositing is enabled.
+  void SetDisplay(const gfx::Display& display);
+
+  // Sets cursor location, shape, set and visibility.
+  void UpdateLocation();
+  void SetCursor(gfx::NativeCursor cursor);
+  void SetCursorSet(ui::CursorSetType);
+  void SetVisibility(bool visible);
+
+ private:
+  friend class test::MirrorWindowTestApi;
+
+  // Sets the container window for the cursor window controller.
+  // Closes the cursor window if |container| is NULL.
+  void SetContainer(aura::Window* container);
+
+  // Sets the bounds of the container in screen coordinates.
+  void SetBoundsInScreen(const gfx::Rect& bounds);
+
+  // Updates cursor image based on current cursor state.
+  void UpdateCursorImage();
+
+  bool is_cursor_compositing_enabled_;
+  aura::Window* container_;
+
+  // The bounds of the container in screen coordinates.
+  gfx::Rect bounds_in_screen_;
+
+  // The native_type of the cursor, see definitions in cursor.h
+  int cursor_type_;
+
+  ui::CursorSetType cursor_set_;
+  gfx::Display::Rotation cursor_rotation_;
+  gfx::Point hot_point_;
+
+  // The display on which the cursor is drawn.
+  // For mirroring mode, the display is always the primary display.
+  gfx::Display display_;
+
+  scoped_ptr<aura::Window> cursor_window_;
+  scoped_ptr<CursorWindowDelegate> delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(CursorWindowController);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_DISPLAY_CURSOR_WINDOW_CONTROLLER_H_