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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef ASH_WM_DRAG_WINDOW_RESIZER_H_
      6 #define ASH_WM_DRAG_WINDOW_RESIZER_H_
      7 
      8 #include "ash/wm/window_resizer.h"
      9 #include "base/compiler_specific.h"
     10 #include "base/gtest_prod_util.h"
     11 #include "base/memory/weak_ptr.h"
     12 #include "ui/gfx/point.h"
     13 
     14 namespace ash {
     15 
     16 class DragWindowController;
     17 
     18 // DragWindowResizer is a decorator of WindowResizer and adds the ability to
     19 // drag windows across displays.
     20 class ASH_EXPORT DragWindowResizer : public WindowResizer {
     21  public:
     22   virtual ~DragWindowResizer();
     23 
     24   // Creates a new DragWindowResizer. The caller takes ownership of the
     25   // returned object. The ownership of |next_window_resizer| is taken by the
     26   // returned object. Returns NULL if not resizable.
     27   static DragWindowResizer* Create(WindowResizer* next_window_resizer,
     28                                    wm::WindowState* window_state);
     29 
     30   // WindowResizer:
     31   virtual void Drag(const gfx::Point& location, int event_flags) OVERRIDE;
     32   virtual void CompleteDrag() OVERRIDE;
     33   virtual void RevertDrag() OVERRIDE;
     34 
     35  private:
     36   FRIEND_TEST_ALL_PREFIXES(DragWindowResizerTest, DragWindowController);
     37 
     38   // Creates DragWindowResizer that adds the ability of dragging windows across
     39   // displays to |next_window_resizer|. This object takes the ownership of
     40   // |next_window_resizer|.
     41   explicit DragWindowResizer(WindowResizer* next_window_resizer,
     42                              wm::WindowState* window_state);
     43 
     44   // Updates the bounds of the phantom window for window dragging. Set true on
     45   // |in_original_root| if the pointer is still in |window()->GetRootWindow()|.
     46   void UpdateDragWindow(const gfx::Rect& bounds, bool in_original_root);
     47 
     48   // Returns true if we should allow the mouse pointer to warp.
     49   bool ShouldAllowMouseWarp();
     50 
     51   scoped_ptr<WindowResizer> next_window_resizer_;
     52 
     53   // Shows a semi-transparent image of the window being dragged.
     54   scoped_ptr<DragWindowController> drag_window_controller_;
     55 
     56   gfx::Point last_mouse_location_;
     57 
     58   // Current instance for use by the DragWindowResizerTest.
     59   static DragWindowResizer* instance_;
     60 
     61   base::WeakPtrFactory<DragWindowResizer> weak_ptr_factory_;
     62 
     63   DISALLOW_COPY_AND_ASSIGN(DragWindowResizer);
     64 };
     65 
     66 }  // namespace ash
     67 
     68 #endif  // ASH_WM_DRAG_WINDOW_RESIZER_H_
     69