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 "ui/gfx/point.h"
12
13namespace ash {
14namespace internal {
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                                   aura::Window* window,
29                                   const gfx::Point& location,
30                                   int window_component,
31                                   aura::client::WindowMoveSource source);
32
33  // WindowResizer:
34  virtual void Drag(const gfx::Point& location, int event_flags) OVERRIDE;
35  virtual void CompleteDrag(int event_flags) OVERRIDE;
36  virtual void RevertDrag() OVERRIDE;
37  virtual aura::Window* GetTarget() OVERRIDE;
38  virtual const gfx::Point& GetInitialLocation() const OVERRIDE;
39
40 private:
41  FRIEND_TEST_ALL_PREFIXES(DragWindowResizerTest, DragWindowController);
42
43  // Creates DragWindowResizer that adds the ability of dragging windows across
44  // displays to |next_window_resizer|. This object takes the ownership of
45  // |next_window_resizer|.
46  explicit DragWindowResizer(WindowResizer* next_window_resizer,
47                             const Details& details);
48
49  // Updates the bounds of the phantom window for window dragging. Set true on
50  // |in_original_root| if the pointer is still in |window()->GetRootWindow()|.
51  void UpdateDragWindow(const gfx::Rect& bounds, bool in_original_root);
52
53  // Returns true if we should allow the mouse pointer to warp.
54  bool ShouldAllowMouseWarp();
55
56  scoped_ptr<WindowResizer> next_window_resizer_;
57
58  // Shows a semi-transparent image of the window being dragged.
59  scoped_ptr<DragWindowController> drag_window_controller_;
60
61  const Details details_;
62
63  gfx::Point last_mouse_location_;
64
65  // If non-NULL the destructor sets this to true. Used to determine if this has
66  // been deleted.
67  bool* destroyed_;
68
69  // Current instance for use by the DragWindowResizerTest.
70  static DragWindowResizer* instance_;
71
72  DISALLOW_COPY_AND_ASSIGN(DragWindowResizer);
73};
74
75}  // namespace internal
76}  // namespace aura
77
78#endif  // ASH_WM_DRAG_WINDOW_RESIZER_H_
79