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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 #include "athena/screen/public/screen_manager.h" | |
6 #include "athena/system/orientation_controller.h" | |
7 #include "base/bind.h" | |
8 #include "base/files/file_path_watcher.h" | |
9 #include "base/files/file_util.h" | |
10 #include "base/message_loop/message_loop.h" | |
11 #include "base/task_runner.h" | |
12 #include "chromeos/accelerometer/accelerometer_reader.h" | |
13 | |
14 namespace athena { | |
15 | |
16 namespace { | |
17 | |
18 // Threshold after which to rotate in a given direction. | |
19 const int kGravityThreshold = 6.0f; | |
20 | |
21 } // namespace | |
22 | |
23 OrientationController::OrientationController() { | |
24 } | |
25 | |
26 void OrientationController::InitWith( | |
27 scoped_refptr<base::TaskRunner> blocking_task_runner) { | |
28 chromeos::AccelerometerReader::GetInstance()->Initialize( | |
29 blocking_task_runner); | |
30 chromeos::AccelerometerReader::GetInstance()->AddObserver(this); | |
31 } | |
32 | |
33 OrientationController::~OrientationController() { | |
34 } | |
35 | |
36 void OrientationController::Shutdown() { | |
37 chromeos::AccelerometerReader::GetInstance()->RemoveObserver(this); | |
38 } | |
39 | |
40 void OrientationController::OnAccelerometerUpdated( | |
41 const ui::AccelerometerUpdate& update) { | |
42 if (!update.has(ui::ACCELEROMETER_SOURCE_SCREEN)) | |
43 return; | |
44 | |
45 float gravity_x = update.get(ui::ACCELEROMETER_SOURCE_SCREEN).x(); | |
46 float gravity_y = update.get(ui::ACCELEROMETER_SOURCE_SCREEN).y(); | |
47 gfx::Display::Rotation rotation; | |
48 if (gravity_x < -kGravityThreshold) { | |
49 rotation = gfx::Display::ROTATE_270; | |
50 } else if (gravity_x > kGravityThreshold) { | |
51 rotation = gfx::Display::ROTATE_90; | |
52 } else if (gravity_y < -kGravityThreshold) { | |
53 rotation = gfx::Display::ROTATE_180; | |
54 } else if (gravity_y > kGravityThreshold) { | |
55 rotation = gfx::Display::ROTATE_0; | |
56 } else { | |
57 // No rotation as gravity threshold was not hit. | |
58 return; | |
59 } | |
60 | |
61 if (rotation == current_rotation_) | |
62 return; | |
63 | |
64 current_rotation_ = rotation; | |
65 ScreenManager::Get()->SetRotation(rotation); | |
66 } | |
67 | |
68 } // namespace athena | |
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