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1 // Copyright 2014 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 ATHENA_WM_TITLE_DRAG_CONTROLLER_H_ | |
6 #define ATHENA_WM_TITLE_DRAG_CONTROLLER_H_ | |
7 | |
8 #include "base/macros.h" | |
9 #include "base/memory/scoped_ptr.h" | |
10 #include "base/memory/weak_ptr.h" | |
11 #include "ui/aura/window_tracker.h" | |
12 #include "ui/events/event_handler.h" | |
13 #include "ui/gfx/geometry/point.h" | |
14 | |
15 namespace aura { | |
16 class Window; | |
17 } | |
18 | |
19 namespace wm { | |
20 class Shadow; | |
21 } | |
22 | |
23 namespace athena { | |
24 | |
25 class TitleDragControllerDelegate { | |
26 public: | |
27 virtual ~TitleDragControllerDelegate() {} | |
28 | |
29 // Returns the window behind |window|. The returned window is the one that | |
30 // would be revealed while |window|'s title is dragged. | |
31 virtual aura::Window* GetWindowBehind(aura::Window* window) = 0; | |
32 | |
33 // Notifies the delegate during various stages of the drag. | |
34 virtual void OnTitleDragStarted(aura::Window* window) = 0; | |
35 virtual void OnTitleDragCompleted(aura::Window* window) = 0; | |
36 virtual void OnTitleDragCanceled(aura::Window* window) = 0; | |
37 }; | |
38 | |
39 // Responsible for allowing dragging a window by its title bar. | |
40 class TitleDragController : public ui::EventHandler { | |
41 public: | |
42 TitleDragController(aura::Window* container, | |
43 TitleDragControllerDelegate* delegate); | |
44 ~TitleDragController() override; | |
45 | |
46 private: | |
47 void EndTransition(aura::Window* window, bool complete); | |
48 void OnTransitionEnd(aura::Window* window, bool complete); | |
49 | |
50 // ui::EventHandler: | |
51 void OnGestureEvent(ui::GestureEvent* gesture) override; | |
52 | |
53 aura::Window* container_; | |
54 TitleDragControllerDelegate* delegate_; | |
55 gfx::Point drag_start_location_; | |
56 scoped_ptr<wm::Shadow> shadow_; | |
57 aura::WindowTracker tracker_; | |
58 | |
59 base::WeakPtrFactory<TitleDragController> weak_ptr_; | |
60 | |
61 DISALLOW_COPY_AND_ASSIGN(TitleDragController); | |
62 }; | |
63 | |
64 } // namespace athena | |
65 | |
66 #endif // ATHENA_WM_TITLE_DRAG_CONTROLLER_H_ | |
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