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
14namespace ash {
15
16class DragWindowController;
17
18// DragWindowResizer is a decorator of WindowResizer and adds the ability to
19// drag windows across displays.
20class 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