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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 COMPONENTS_MUS_WS_MOVE_LOOP_H_ | |
6 #define COMPONENTS_MUS_WS_MOVE_LOOP_H_ | |
7 | |
8 #include "base/macros.h" | |
9 #include "base/memory/scoped_ptr.h" | |
10 #include "components/mus/ws/server_window_observer.h" | |
11 #include "ui/gfx/geometry/point.h" | |
12 #include "ui/gfx/geometry/rect.h" | |
13 #include "ui/mojo/events/input_events.mojom.h" | |
14 | |
15 namespace mus { | |
16 namespace ws { | |
17 | |
18 class ServerWindow; | |
19 | |
20 // MoveLoop is responsible for moving/resizing windows. EventDispatcher | |
21 // attempts to create a MoveLoop on every POINTER_DOWN event. Once a MoveLoop | |
22 // is created it is fed events until an event is received that stops the loop. | |
23 class MoveLoop : public ServerWindowObserver { | |
24 public: | |
25 enum MoveResult { | |
26 // The move is still ongoing. | |
27 CONTINUE, | |
28 | |
29 // The move is done and the MoveLoop should be destroyed. | |
30 DONE, | |
31 }; | |
32 | |
33 ~MoveLoop() override; | |
34 | |
35 // If a move/resize loop should occur for the specified parameters creates | |
36 // and returns a new MoveLoop. All events should be funneled to the MoveLoop | |
37 // until done (Move()). | |
38 static scoped_ptr<MoveLoop> Create(ServerWindow* target, | |
39 const mojo::Event& event); | |
40 | |
41 // Processes an event for a move/resize loop. | |
42 MoveResult Move(const mojo::Event& event); | |
43 | |
44 private: | |
45 MoveLoop(ServerWindow* target, const mojo::Event& event); | |
46 | |
47 // Does the actual move/resize. | |
48 void MoveImpl(const mojo::Event& event); | |
49 | |
50 // Cancels the loop. This sets |target_| to null and removes the observer. | |
51 // After this the MoveLoop is still ongoing and won't stop until the | |
52 // appropriate event is received. | |
53 void Cancel(); | |
54 | |
55 void Revert(); | |
56 | |
57 // ServerWindowObserver: | |
58 void OnWindowHierarchyChanged(ServerWindow* window, | |
59 ServerWindow* new_parent, | |
60 ServerWindow* old_parent) override; | |
61 void OnWindowBoundsChanged(ServerWindow* window, | |
62 const gfx::Rect& old_bounds, | |
63 const gfx::Rect& new_bounds) override; | |
64 void OnWindowVisibilityChanged(ServerWindow* window) override; | |
65 | |
66 // The window this MoveLoop is acting on. |target_| is set to null if the | |
67 // window unexpectedly changes while the move is in progress. | |
68 ServerWindow* target_; | |
69 | |
70 // The id of the pointer that triggered the move. | |
71 const int32_t pointer_id_; | |
72 | |
73 // Location of the event (in screen coordinates) that triggered the move. | |
74 const gfx::Point initial_event_screen_location_; | |
75 | |
76 // Original bounds of the window. | |
77 const gfx::Rect initial_window_bounds_; | |
78 | |
79 // Set to true when MoveLoop changes the bounds of |target_|. The move is | |
80 // canceled if the bounds change unexpectedly during the move. | |
81 bool changing_bounds_; | |
82 | |
83 DISALLOW_COPY_AND_ASSIGN(MoveLoop); | |
84 }; | |
85 | |
86 } // namespace ws | |
87 } // namespace mus | |
88 | |
89 #endif // COMPONENTS_MUS_WS_MOVE_LOOP_H_ | |
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