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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 
     13 namespace athena {
     14 
     15 namespace {
     16 
     17 // Threshold after which to rotate in a given direction.
     18 const int kGravityThreshold = 6.0f;
     19 
     20 }  // namespace
     21 
     22 OrientationController::OrientationController() {
     23 }
     24 
     25 void OrientationController::InitWith(
     26     scoped_refptr<base::TaskRunner> blocking_task_runner) {
     27   accelerometer_reader_.reset(
     28       new chromeos::AccelerometerReader(blocking_task_runner, this));
     29 }
     30 
     31 OrientationController::~OrientationController() {
     32 }
     33 
     34 void OrientationController::Shutdown() {
     35   accelerometer_reader_.reset();
     36 }
     37 
     38 void OrientationController::HandleAccelerometerUpdate(
     39     const ui::AccelerometerUpdate& update) {
     40   if (!update.has(ui::ACCELEROMETER_SOURCE_SCREEN))
     41     return;
     42 
     43   float gravity_x = update.get(ui::ACCELEROMETER_SOURCE_SCREEN).x();
     44   float gravity_y = update.get(ui::ACCELEROMETER_SOURCE_SCREEN).y();
     45   gfx::Display::Rotation rotation;
     46   if (gravity_x < -kGravityThreshold) {
     47     rotation = gfx::Display::ROTATE_270;
     48   } else if (gravity_x > kGravityThreshold) {
     49     rotation = gfx::Display::ROTATE_90;
     50   } else if (gravity_y < -kGravityThreshold) {
     51     rotation = gfx::Display::ROTATE_180;
     52   } else if (gravity_y > kGravityThreshold) {
     53     rotation = gfx::Display::ROTATE_0;
     54   } else {
     55     // No rotation as gravity threshold was not hit.
     56     return;
     57   }
     58 
     59   if (rotation == current_rotation_)
     60     return;
     61 
     62   current_rotation_ = rotation;
     63   ScreenManager::Get()->SetRotation(rotation);
     64 }
     65 
     66 }  // namespace athena
     67