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1 // Copyright 2015 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 MASH_WM_MOVE_LOOP_H_ | |
6 #define MASH_WM_MOVE_LOOP_H_ | |
7 | |
8 #include "base/macros.h" | |
9 #include "base/memory/scoped_ptr.h" | |
10 #include "components/mus/public/cpp/window_observer.h" | |
11 #include "components/mus/public/interfaces/input_events.mojom.h" | |
12 #include "ui/gfx/geometry/point.h" | |
13 #include "ui/gfx/geometry/rect.h" | |
14 | |
15 // MoveLoop is responsible for moving/resizing windows. | |
16 class MoveLoop : public mus::WindowObserver { | |
17 public: | |
18 enum MoveResult { | |
19 // The move is still ongoing. | |
20 CONTINUE, | |
21 | |
22 // The move is done and the MoveLoop should be destroyed. | |
23 DONE, | |
24 }; | |
25 | |
26 enum class HorizontalLocation { | |
27 LEFT, | |
28 RIGHT, | |
29 OTHER, | |
30 }; | |
31 | |
32 enum class VerticalLocation { | |
33 TOP, | |
34 BOTTOM, | |
35 OTHER, | |
36 }; | |
37 | |
38 // Number of pixels in which a resize is triggered. | |
39 static const int kResizeSize = 8; | |
40 | |
41 ~MoveLoop() override; | |
42 | |
43 // If a move/resize loop should occur for the specified parameters creates | |
44 // and returns a new MoveLoop. All events should be funneled to the MoveLoop | |
45 // until done (Move()). | |
46 static scoped_ptr<MoveLoop> Create(mus::Window* target, | |
47 const mus::mojom::Event& event); | |
48 | |
49 // Processes an event for a move/resize loop. | |
50 MoveResult Move(const mus::mojom::Event& event); | |
51 | |
52 private: | |
53 enum class Type { | |
54 MOVE, | |
55 RESIZE, | |
56 }; | |
57 | |
58 MoveLoop(mus::Window* target, | |
59 const mus::mojom::Event& event, | |
60 Type type, | |
61 HorizontalLocation h_loc, | |
62 VerticalLocation v_loc); | |
63 | |
64 static void DetermineType(mus::Window* target, | |
65 const gfx::Point& location, | |
66 Type* type, | |
67 HorizontalLocation* h_loc, | |
68 VerticalLocation* v_loc); | |
69 | |
70 // Does the actual move/resize. | |
71 void MoveImpl(const mus::mojom::Event& event); | |
72 | |
73 // Cancels the loop. This sets |target_| to null and removes the observer. | |
74 // After this the MoveLoop is still ongoing and won't stop until the | |
75 // appropriate event is received. | |
76 void Cancel(); | |
77 | |
78 void Revert(); | |
79 | |
80 gfx::Rect DetermineBoundsFromDelta(const gfx::Vector2d& delta); | |
81 | |
82 // mus::WindowObserver: | |
83 void OnTreeChanged(const TreeChangeParams& params) override; | |
84 void OnWindowBoundsChanged(mus::Window* window, | |
85 const gfx::Rect& old_bounds, | |
86 const gfx::Rect& new_bounds) override; | |
87 void OnWindowVisibilityChanged(mus::Window* window) override; | |
88 | |
89 // The window this MoveLoop is acting on. |target_| is set to null if the | |
90 // window unexpectedly changes while the move is in progress. | |
91 mus::Window* target_; | |
92 | |
93 const Type type_; | |
94 const HorizontalLocation h_loc_; | |
95 const VerticalLocation v_loc_; | |
96 | |
97 // The id of the pointer that triggered the move. | |
98 const int32_t pointer_id_; | |
99 | |
100 // Location of the event (in screen coordinates) that triggered the move. | |
101 const gfx::Point initial_event_screen_location_; | |
102 | |
103 // Original bounds of the window. | |
104 const gfx::Rect initial_window_bounds_; | |
105 | |
106 const gfx::Rect initial_user_set_bounds_; | |
107 | |
108 // Set to true when MoveLoop changes the bounds of |target_|. The move is | |
109 // canceled if the bounds change unexpectedly during the move. | |
110 bool changing_bounds_; | |
111 | |
112 DISALLOW_COPY_AND_ASSIGN(MoveLoop); | |
113 }; | |
114 | |
115 #endif // MASH_WM_MOVE_LOOP_H_ | |
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