Move Screen Rotation from MaximizeModeController to ScreenOrientationController

ash/wm/maximize_mode/maximize_mode_controller.cc

Index: ash/wm/maximize_mode/maximize_mode_controller.cc
diff --git a/ash/wm/maximize_mode/maximize_mode_controller.cc b/ash/wm/maximize_mode/maximize_mode_controller.cc
index 511df7b94d65201e23329e30b5aea7c71f6ed56b..388f350ec6cadd8d0b1dea2aaef9739f4beabc8d 100644
--- a/ash/wm/maximize_mode/maximize_mode_controller.cc
+++ b/ash/wm/maximize_mode/maximize_mode_controller.cc
@@ -11,7 +11,6 @@
 #include "ash/shell.h"
 #include "ash/wm/maximize_mode/maximize_mode_window_manager.h"
 #include "ash/wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard.h"
-#include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/time/default_tick_clock.h"
@@ -63,13 +62,6 @@ const base::TimeDelta kLidRecentlyOpenedDuration =
 const float kHingeAngleDetectionThreshold = 2.5f;
 
 #if defined(OS_CHROMEOS)
-// 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;
-
 // The maximum deviation between the magnitude of the two accelerometers under
 // which to detect hinge angle and screen rotation in m/s^2. These
 // accelerometers are attached to the same physical device and so should be
@@ -77,51 +69,11 @@ const float kDeviationFromGravityThreshold = 1.0f;
 const float kNoisyMagnitudeDeviation = 1.0f;
 #endif
 
-// The angle which the screen has to be rotated past before the display will
-// rotate to match it (i.e. 45.0f is no stickiness).
-const float kDisplayRotationStickyAngleDegrees = 60.0f;
-
-// The minimum acceleration in m/s^2 in a direction required to trigger screen
-// rotation. This prevents rapid toggling of rotation when the device is near
-// flat and there is very little screen aligned force on it. The value is
-// effectively the sine of the rise angle required times the acceleration due
-// to gravity, with the current value requiring at least a 25 degree rise.
-const float kMinimumAccelerationScreenRotation = 4.2f;
-
-const float kRadiansToDegrees = 180.0f / 3.14159265f;
-
-// Returns the angle between |base| and |other| in degrees.
-float AngleBetweenVectorsInDegrees(const gfx::Vector3dF& base,
-                                 const gfx::Vector3dF& other) {
-  return acos(gfx::DotProduct(base, other) /
-              base.Length() / other.Length()) * kRadiansToDegrees;
-}
-
-// Returns the clockwise angle between |base| and |other| where |normal| is the
-// normal of the virtual surface to measure clockwise according to.
-float ClockwiseAngleBetweenVectorsInDegrees(const gfx::Vector3dF& base,
-                                            const gfx::Vector3dF& other,
-                                            const gfx::Vector3dF& normal) {
-  float angle = AngleBetweenVectorsInDegrees(base, other);
-  gfx::Vector3dF cross(base);
-  cross.Cross(other);
-  // If the dot product of this cross product is normal, it means that the
-  // shortest angle between |base| and |other| was counterclockwise with respect
-  // to the surface represented by |normal| and this angle must be reversed.
-  if (gfx::DotProduct(cross, normal) > 0.0f)
-    angle = 360.0f - angle;
-  return angle;
-}
-
 }  // namespace
 
 MaximizeModeController::MaximizeModeController()
-    : rotation_locked_(false),
-      have_seen_accelerometer_data_(false),
-      ignore_display_configuration_updates_(false),
+    : have_seen_accelerometer_data_(false),
       lid_open_past_180_(false),
-      shutting_down_(false),
-      user_rotation_(gfx::Display::ROTATE_0),
       last_touchview_transition_time_(base::Time::Now()),
       tick_clock_(new base::DefaultTickClock()),
       lid_is_closed_(false) {
@@ -142,31 +94,6 @@ MaximizeModeController::~MaximizeModeController() {
 #endif  // OS_CHROMEOS
 }
 
-void MaximizeModeController::SetRotationLocked(bool rotation_locked) {
-  if (rotation_locked_ == rotation_locked)
-    return;
-  base::AutoReset<bool> auto_ignore_display_configuration_updates(
-      &ignore_display_configuration_updates_, true);
-  rotation_locked_ = rotation_locked;
-  Shell::GetInstance()->display_manager()->
-      RegisterDisplayRotationProperties(rotation_locked_, current_rotation_);
-  FOR_EACH_OBSERVER(Observer, observers_,
-                    OnRotationLockChanged(rotation_locked_));
-}
-
-void MaximizeModeController::LockRotation(gfx::Display::Rotation rotation) {
-  SetRotationLocked(true);
-  SetDisplayRotation(Shell::GetInstance()->display_manager(), rotation);
-}
-
-void MaximizeModeController::AddObserver(Observer* observer) {
-  observers_.AddObserver(observer);
-}
-
-void MaximizeModeController::RemoveObserver(Observer* observer) {
-  observers_.RemoveObserver(observer);
-}
-
 bool MaximizeModeController::CanEnterMaximizeMode() {
   // If we have ever seen accelerometer data, then HandleHingeRotation may
   // trigger maximize mode at some point in the future.
@@ -198,72 +125,34 @@ void MaximizeModeController::AddWindow(aura::Window* window) {
     maximize_mode_window_manager_->AddWindow(window);
 }
 
-void MaximizeModeController::Shutdown() {
-  shutting_down_ = true;
-  LeaveMaximizeMode();
-}
-
-void MaximizeModeController::OnDisplayConfigurationChanged() {
-  if (ignore_display_configuration_updates_)
-    return;
-  DisplayManager* display_manager = Shell::GetInstance()->display_manager();
-  gfx::Display::Rotation user_rotation =
-      display_manager->GetDisplayInfo(gfx::Display::InternalDisplayId())
-          .rotation();
-  if (user_rotation != current_rotation_) {
-    // A user may change other display configuration settings. When the user
-    // does change the rotation setting, then lock rotation to prevent the
-    // accelerometer from erasing their change.
-    SetRotationLocked(true);
-    user_rotation_ = user_rotation;
-    current_rotation_ = user_rotation;
-  }
-}
-
 #if defined(OS_CHROMEOS)
 void MaximizeModeController::OnAccelerometerUpdated(
     const ui::AccelerometerUpdate& update) {
   bool first_accelerometer_update = !have_seen_accelerometer_data_;
   have_seen_accelerometer_data_ = true;
 
-  // Ignore the reading if it appears unstable. The reading is considered
-  // unstable if it deviates too much from gravity and/or the magnitude of the
-  // reading from the lid differs too much from the reading from the base.
-  float lid_magnitude = update.has(ui::ACCELEROMETER_SOURCE_SCREEN) ?
-      update.get(ui::ACCELEROMETER_SOURCE_SCREEN).Length() : 0.0f;
-  bool lid_stable = update.has(ui::ACCELEROMETER_SOURCE_SCREEN) &&
-      std::abs(lid_magnitude - kMeanGravity) <= kDeviationFromGravityThreshold;
+  if (!update.has(ui::ACCELEROMETER_SOURCE_SCREEN))
+    return;
 
   // Whether or not we enter maximize mode affects whether we handle screen
   // rotation, so determine whether to enter maximize mode first.
   if (!update.has(ui::ACCELEROMETER_SOURCE_ATTACHED_KEYBOARD)) {
-    if (first_accelerometer_update &&
-        update.has(ui::ACCELEROMETER_SOURCE_SCREEN)) {
+    if (first_accelerometer_update)
       EnterMaximizeMode();
-    }
-  } else {  // update.has(ui::ACCELEROMETER_SOURCE_ATTACHED_KEYBOARD)
-    float base_magnitude =
-        update.get(ui::ACCELEROMETER_SOURCE_ATTACHED_KEYBOARD).Length();
-    bool base_angle_stable = lid_stable &&
-        std::abs(base_magnitude - lid_magnitude) <= kNoisyMagnitudeDeviation &&
-        std::abs(base_magnitude - kMeanGravity) <=
-            kDeviationFromGravityThreshold;
-    if (base_angle_stable) {
-      HandleHingeRotation(
-          update.get(ui::ACCELEROMETER_SOURCE_ATTACHED_KEYBOARD),
-          update.get(ui::ACCELEROMETER_SOURCE_SCREEN));
-    }
-  }
-
-  if (lid_stable)
-    HandleScreenRotation(update.get(ui::ACCELEROMETER_SOURCE_SCREEN));
-
-  if (first_accelerometer_update) {
-    // On the first accelerometer update we will know if we have entered
-    // maximize mode or not. Update the preferences to reflect the current
-    // state.
-    Shell::GetInstance()->display_manager()->
-        RegisterDisplayRotationProperties(rotation_locked_, current_rotation_);
+  } else if (chromeos::AccelerometerReader::IsReadingStable(
+                 update, ui::ACCELEROMETER_SOURCE_SCREEN) &&
+             chromeos::AccelerometerReader::IsReadingStable(
+                 update, ui::ACCELEROMETER_SOURCE_ATTACHED_KEYBOARD) &&
+             std::abs(update.get(ui::ACCELEROMETER_SOURCE_ATTACHED_KEYBOARD)
+                          .Length() -
+                      update.get(ui::ACCELEROMETER_SOURCE_SCREEN).Length()) <=
+                 kNoisyMagnitudeDeviation) {
+    // update.has(ui::ACCELEROMETER_SOURCE_ATTACHED_KEYBOARD)
+    // Ignore the reading if it appears unstable. The reading is considered
+    // unstable if it deviates too much from gravity and/or the magnitude of the
+    // reading from the lid differs too much from the reading from the base.
+    HandleHingeRotation(update.get(ui::ACCELEROMETER_SOURCE_ATTACHED_KEYBOARD),
+                        update.get(ui::ACCELEROMETER_SOURCE_SCREEN));
   }
 }
 
@@ -304,8 +193,8 @@ void MaximizeModeController::HandleHingeRotation(const gfx::Vector3dF& base,
   }
 
   // Compute the angle between the base and the lid.
-  float lid_angle = 180.0f - ClockwiseAngleBetweenVectorsInDegrees(
-      base_flattened, lid_flattened, hinge_vector);
+  float lid_angle = 180.0f - gfx::ClockwiseAngleBetweenVectorsInDegrees(
+                                 base_flattened, lid_flattened, hinge_vector);
   if (lid_angle < 0.0f)
     lid_angle += 360.0f;
 
@@ -341,106 +230,16 @@ void MaximizeModeController::HandleHingeRotation(const gfx::Vector3dF& base,
   }
 }
 
-void MaximizeModeController::HandleScreenRotation(const gfx::Vector3dF& lid) {
-  bool maximize_mode_engaged = IsMaximizeModeWindowManagerEnabled();
-
-  // TODO(jonross): track the updated rotation angle even when locked. So that
-  // when rotation lock is removed the accelerometer rotation can be applied
-  // without waiting for the next update.
-  if (!maximize_mode_engaged || rotation_locked_)
-    return;
-
-  DisplayManager* display_manager =
-      Shell::GetInstance()->display_manager();
-  gfx::Display::Rotation current_rotation = display_manager->GetDisplayInfo(
-      gfx::Display::InternalDisplayId()).rotation();
-
-  // After determining maximize mode state, determine if the screen should
-  // be rotated.
-  gfx::Vector3dF lid_flattened(lid.x(), lid.y(), 0.0f);
-  float lid_flattened_length = lid_flattened.Length();
-  // When the lid is close to being flat, don't change rotation as it is too
-  // sensitive to slight movements.
-  if (lid_flattened_length < kMinimumAccelerationScreenRotation)
-    return;
-
-  // The reference vector is the angle of gravity when the device is rotated
-  // clockwise by 45 degrees. Computing the angle between this vector and
-  // gravity we can easily determine the expected display rotation.
-  static const gfx::Vector3dF rotation_reference(-1.0f, -1.0f, 0.0f);
-
-  // Set the down vector to match the expected direction of gravity given the
-  // last configured rotation. This is used to enforce a stickiness that the
-  // user must overcome to rotate the display and prevents frequent rotations
-  // when holding the device near 45 degrees.
-  gfx::Vector3dF down(0.0f, 0.0f, 0.0f);
-  if (current_rotation == gfx::Display::ROTATE_0)
-    down.set_y(-1.0f);
-  else if (current_rotation == gfx::Display::ROTATE_90)
-    down.set_x(-1.0f);
-  else if (current_rotation == gfx::Display::ROTATE_180)
-    down.set_y(1.0f);
-  else
-    down.set_x(1.0f);
-
-  // Don't rotate if the screen has not passed the threshold.
-  if (AngleBetweenVectorsInDegrees(down, lid_flattened) <
-      kDisplayRotationStickyAngleDegrees) {
-    return;
-  }
-
-  float angle = ClockwiseAngleBetweenVectorsInDegrees(rotation_reference,
-      lid_flattened, gfx::Vector3dF(0.0f, 0.0f, -1.0f));
-
-  gfx::Display::Rotation new_rotation = gfx::Display::ROTATE_90;
-  if (angle < 90.0f)
-    new_rotation = gfx::Display::ROTATE_0;
-  else if (angle < 180.0f)
-    new_rotation = gfx::Display::ROTATE_270;
-  else if (angle < 270.0f)
-    new_rotation = gfx::Display::ROTATE_180;
-
-  if (new_rotation != current_rotation)
-    SetDisplayRotation(display_manager, new_rotation);
-}
-
-void MaximizeModeController::SetDisplayRotation(
-    DisplayManager* display_manager,
-    gfx::Display::Rotation rotation) {
-  base::AutoReset<bool> auto_ignore_display_configuration_updates(
-      &ignore_display_configuration_updates_, true);
-  current_rotation_ = rotation;
-  display_manager->SetDisplayRotation(gfx::Display::InternalDisplayId(),
-                                      rotation);
-}
-
 void MaximizeModeController::EnterMaximizeMode() {
   if (IsMaximizeModeWindowManagerEnabled())
     return;
-  DisplayManager* display_manager = Shell::GetInstance()->display_manager();
-  if (display_manager->HasInternalDisplay()) {
-    current_rotation_ = user_rotation_ = display_manager->
-        GetDisplayInfo(gfx::Display::InternalDisplayId()).rotation();
-    LoadDisplayRotationProperties();
-  }
   EnableMaximizeModeWindowManager(true);
-  Shell::GetInstance()->display_controller()->AddObserver(this);
 }
 
 void MaximizeModeController::LeaveMaximizeMode() {
   if (!IsMaximizeModeWindowManagerEnabled())
     return;
-  DisplayManager* display_manager = Shell::GetInstance()->display_manager();
-  if (display_manager->HasInternalDisplay()) {
-    gfx::Display::Rotation current_rotation = display_manager->
-        GetDisplayInfo(gfx::Display::InternalDisplayId()).rotation();
-    if (current_rotation != user_rotation_)
-      SetDisplayRotation(display_manager, user_rotation_);
-  }
-  if (!shutting_down_)
-    SetRotationLocked(false);
   EnableMaximizeModeWindowManager(false);
-  Shell::GetInstance()->display_controller()->RemoveObserver(this);
 }
 
 // Called after maximize mode has started, windows might still animate though.
@@ -469,16 +268,6 @@ void MaximizeModeController::RecordTouchViewStateTransition() {
   }
 }
 
-void MaximizeModeController::LoadDisplayRotationProperties() {
-  DisplayManager* display_manager = Shell::GetInstance()->display_manager();
-  if (!display_manager->registered_internal_display_rotation_lock())
-    return;
-
-  SetDisplayRotation(display_manager,
-                     display_manager->registered_internal_display_rotation());
-  SetRotationLocked(true);
-}
-
 void MaximizeModeController::OnAppTerminating() {
   if (CanEnterMaximizeMode()) {
     RecordTouchViewStateTransition();
@@ -495,7 +284,6 @@ void MaximizeModeController::OnAppTerminating() {
           100 * total_touchview_time_.InSeconds() / total_runtime.InSeconds());
     }
   }
-  Shell::GetInstance()->display_controller()->RemoveObserver(this);
 }
 
 bool MaximizeModeController::WasLidOpenedRecently() const {