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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 ASH_COMMON_WM_WORKSPACE_TWO_STEP_EDGE_CYCLER_H_ | |
6 #define ASH_COMMON_WM_WORKSPACE_TWO_STEP_EDGE_CYCLER_H_ | |
7 | |
8 #include "ash/ash_export.h" | |
9 #include "base/macros.h" | |
10 #include "base/time/time.h" | |
11 #include "ui/gfx/geometry/point.h" | |
12 | |
13 namespace ash { | |
14 | |
15 // TwoStepEdgeCycler is responsible for cycling between two modes when the mouse | |
16 // is at the edge of the workspace. The cycler does not loop so it is impossible | |
17 // to get back to the first mode once the second mode is reached. | |
18 // TwoStepEdgeCycler should be destroyed once the mouse moves off the edge of | |
19 // the workspace. | |
20 class ASH_EXPORT TwoStepEdgeCycler { | |
21 public: | |
22 // The direction in which a mouse should travel to switch mode. | |
23 enum Direction { DIRECTION_LEFT, DIRECTION_RIGHT }; | |
24 | |
25 explicit TwoStepEdgeCycler(const gfx::Point& start, Direction direction); | |
26 ~TwoStepEdgeCycler(); | |
27 | |
28 // Update which mode should be used as a result of a mouse / touch move. | |
29 // |location| is the location of the event. | |
30 void OnMove(const gfx::Point& location); | |
31 | |
32 bool use_second_mode() const { return second_mode_; } | |
33 | |
34 private: | |
35 // Whether the second mode should be used. | |
36 bool second_mode_; | |
37 | |
38 // Time OnMove() was last invoked. | |
39 base::TimeTicks time_last_move_; | |
40 | |
41 // The number of moves since the cycler was constructed. | |
42 int num_moves_; | |
43 | |
44 // Initial x-coordinate. | |
45 int start_x_; | |
46 | |
47 // x-coordinate when paused. | |
48 int paused_x_; | |
49 | |
50 // Whether the movement was paused. | |
51 bool paused_; | |
52 | |
53 // Determines a preferred movement direction that we are watching. | |
54 Direction direction_; | |
55 | |
56 DISALLOW_COPY_AND_ASSIGN(TwoStepEdgeCycler); | |
57 }; | |
58 | |
59 } // namespace ash | |
60 | |
61 #endif // ASH_COMMON_WM_WORKSPACE_TWO_STEP_EDGE_CYCLER_H_ | |
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