Move Screen Rotation from MaximizeModeController to ScreenOrientationController

chromeos/accelerometer/accelerometer_reader.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chromeos/accelerometer/accelerometer_reader.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
@@ skipping 40 matching lines @@
 
 // The size of individual values.
 const size_t kDataSize = 2;
 
 // The time to wait between reading the accelerometer.
 const int kDelayBetweenReadsMs = 100;
 
 // The mean acceleration due to gravity on Earth in m/s^2.
 const float kMeanGravity = 9.80665f;
 
+// The maximum deviation from the acceleration expected due to gravity under
+// which to detect hinge angle and screen rotation in m/s^2
+const float kDeviationFromGravityThreshold = 1.0f;
+
 // Reads |path| to the unsigned int pointed to by |value|. Returns true on
 // success or false on failure.
 bool ReadFileToInt(const base::FilePath& path, int* value) {
   std::string s;
   DCHECK(value);
   if (!base::ReadFileToString(path, &s, kMaxAsciiUintLength)) {
     return false;
   }
   base::TrimWhitespaceASCII(s, base::TRIM_ALL, &s);
   if (!base::StringToInt(s, value)) {
@@ skipping 128 matching lines @@
   // startup.
   base::PostTaskAndReplyWithResult(
       task_runner_.get(), FROM_HERE,
       base::Bind(&DetectAndReadAccelerometerConfiguration, configuration_),
       base::Bind(&AccelerometerReader::OnInitialized,
                  weak_factory_.GetWeakPtr(), configuration_));
 }
 
 void AccelerometerReader::AddObserver(Observer* observer) {
   observers_.AddObserver(observer);
+  observer->OnAccelerometerUpdated(update_);
 }
 
 void AccelerometerReader::RemoveObserver(Observer* observer) {
   observers_.RemoveObserver(observer);
 }
 
+bool AccelerometerReader::IsReadingStable(const ui::AccelerometerUpdate& update,
+                                          ui::AccelerometerSource source) {
+  return update.has(source) &&
+         std::abs(update.get(source).Length() - kMeanGravity) <=
+             kDeviationFromGravityThreshold;
+}
+
 void AccelerometerReader::OnInitialized(
     scoped_refptr<AccelerometerReader::Configuration> configuration,
     bool success) {
   if (success)
     TriggerRead();
 }
 
 void AccelerometerReader::TriggerRead() {
   DCHECK(!task_runner_->RunsTasksOnCurrentThread());
 
@@ skipping 32 matching lines @@
 
   // Trigger another read after the current sampling delay.
   base::MessageLoop::current()->PostDelayedTask(
       FROM_HERE,
       base::Bind(&AccelerometerReader::TriggerRead,
                  weak_factory_.GetWeakPtr()),
       base::TimeDelta::FromMilliseconds(kDelayBetweenReadsMs));
 }
 
 }  // namespace chromeos