Create drag windows on all displays

ash/wm/drag_window_resizer.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 ASH_WM_DRAG_WINDOW_RESIZER_H_
 #define ASH_WM_DRAG_WINDOW_RESIZER_H_
 
 #include "ash/wm/window_resizer.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
-#include "base/memory/scoped_vector.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/gfx/geometry/point.h"
 
 namespace ash {
 
 class DragWindowController;
 
 // DragWindowResizer is a decorator of WindowResizer and adds the ability to
 // drag windows across displays.
 class ASH_EXPORT DragWindowResizer : public WindowResizer {
  public:
   ~DragWindowResizer() override;
 
   // Creates a new DragWindowResizer. The caller takes ownership of the
   // returned object. The ownership of |next_window_resizer| is taken by the
   // returned object. Returns NULL if not resizable.
   static DragWindowResizer* Create(WindowResizer* next_window_resizer,
                                    wm::WindowState* window_state);
 
   // WindowResizer:
   void Drag(const gfx::Point& location, int event_flags) override;
   void CompleteDrag() override;
   void RevertDrag() override;
 
  private:
   FRIEND_TEST_ALL_PREFIXES(DragWindowResizerTest, DragWindowController);
-
+  FRIEND_TEST_ALL_PREFIXES(DragWindowResizerTest,
+                           DragWindowControllerAcrossThreeDisplays);
   // Creates DragWindowResizer that adds the ability of dragging windows across
   // displays to |next_window_resizer|. This object takes the ownership of
   // |next_window_resizer|.
   explicit DragWindowResizer(WindowResizer* next_window_resizer,
                              wm::WindowState* window_state);
 
-  // Updates the bounds of the phantom window for window dragging. Set true on
-  // |in_original_root| if the pointer is still in |window()->GetRootWindow()|.
-  void UpdateDragWindow(const gfx::Rect& bounds, bool in_original_root);
+  // Updates the bounds of the drag window for window dragging.
+  void UpdateDragWindow(const gfx::Rect& bounds_in_parent,
+                        const gfx::Point& drag_location_in_screen);
 
   // Returns true if we should allow the mouse pointer to warp.
   bool ShouldAllowMouseWarp();
 
   scoped_ptr<WindowResizer> next_window_resizer_;
 
   // Shows a semi-transparent image of the window being dragged.
-  ScopedVector<DragWindowController> drag_window_controllers_;
+  scoped_ptr<DragWindowController> drag_window_controller_;
 
   gfx::Point last_mouse_location_;
 
   // Current instance for use by the DragWindowResizerTest.
   static DragWindowResizer* instance_;
 
   base::WeakPtrFactory<DragWindowResizer> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DragWindowResizer);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_DRAG_WINDOW_RESIZER_H_