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// 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 "ash/display/screen_orientation_controller_chromeos.h"
#include "ash/common/ash_switches.h"
#include "ash/common/display/display_info.h"
#include "ash/common/wm_shell.h"
#include "ash/display/display_configuration_controller.h"
#include "ash/display/display_manager.h"
#include "ash/shell.h"
#include "ash/wm/maximize_mode/maximize_mode_controller.h"
#include "base/auto_reset.h"
#include "base/command_line.h"
#include "chromeos/accelerometer/accelerometer_reader.h"
#include "chromeos/accelerometer/accelerometer_types.h"
#include "ui/aura/window.h"
#include "ui/aura/window_observer.h"
#include "ui/chromeos/accelerometer/accelerometer_util.h"
#include "ui/display/display.h"
#include "ui/gfx/geometry/size.h"
#include "ui/wm/public/activation_client.h"
namespace {
// 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;
blink::WebScreenOrientationLockType GetDisplayNaturalOrientation() {
if (!display::Display::HasInternalDisplay())
return blink::WebScreenOrientationLockLandscape;
ash::DisplayInfo info =
ash::Shell::GetInstance()->display_manager()->GetDisplayInfo(
display::Display::InternalDisplayId());
gfx::Size size = info.size_in_pixel();
switch (info.GetActiveRotation()) {
case display::Display::ROTATE_0:
case display::Display::ROTATE_180:
return size.height() >= size.width()
? blink::WebScreenOrientationLockPortrait
: blink::WebScreenOrientationLockLandscape;
case display::Display::ROTATE_90:
case display::Display::ROTATE_270:
return size.height() < size.width()
? blink::WebScreenOrientationLockPortrait
: blink::WebScreenOrientationLockLandscape;
}
NOTREACHED();
return blink::WebScreenOrientationLockLandscape;
}
} // namespace
namespace ash {
ScreenOrientationController::ScreenOrientationController()
: natural_orientation_(GetDisplayNaturalOrientation()),
ignore_display_configuration_updates_(false),
rotation_locked_(false),
rotation_locked_orientation_(blink::WebScreenOrientationLockAny),
user_rotation_(display::Display::ROTATE_0),
current_rotation_(display::Display::ROTATE_0) {
WmShell::Get()->AddShellObserver(this);
}
ScreenOrientationController::~ScreenOrientationController() {
WmShell::Get()->RemoveShellObserver(this);
chromeos::AccelerometerReader::GetInstance()->RemoveObserver(this);
Shell::GetInstance()->window_tree_host_manager()->RemoveObserver(this);
Shell::GetInstance()->activation_client()->RemoveObserver(this);
for (auto& windows : locking_windows_)
windows.first->RemoveObserver(this);
}
void ScreenOrientationController::AddObserver(Observer* observer) {
observers_.AddObserver(observer);
}
void ScreenOrientationController::RemoveObserver(Observer* observer) {
observers_.RemoveObserver(observer);
}
void ScreenOrientationController::LockOrientationForWindow(
aura::Window* requesting_window,
blink::WebScreenOrientationLockType lock_orientation) {
if (locking_windows_.empty())
Shell::GetInstance()->activation_client()->AddObserver(this);
if (!requesting_window->HasObserver(this))
requesting_window->AddObserver(this);
locking_windows_[requesting_window] = lock_orientation;
ApplyLockForActiveWindow();
}
void ScreenOrientationController::UnlockOrientationForWindow(
aura::Window* window) {
locking_windows_.erase(window);
if (locking_windows_.empty())
Shell::GetInstance()->activation_client()->RemoveObserver(this);
window->RemoveObserver(this);
ApplyLockForActiveWindow();
}
bool ScreenOrientationController::ScreenOrientationProviderSupported() const {
return Shell::GetInstance()
->maximize_mode_controller()
->IsMaximizeModeWindowManagerEnabled() &&
!base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kAshDisableScreenOrientationLock);
}
void ScreenOrientationController::SetRotationLocked(bool rotation_locked) {
if (rotation_locked_ == rotation_locked)
return;
rotation_locked_ = rotation_locked;
if (!rotation_locked_)
rotation_locked_orientation_ = blink::WebScreenOrientationLockAny;
FOR_EACH_OBSERVER(Observer, observers_,
OnRotationLockChanged(rotation_locked_));
if (!display::Display::HasInternalDisplay())
return;
base::AutoReset<bool> auto_ignore_display_configuration_updates(
&ignore_display_configuration_updates_, true);
Shell::GetInstance()->display_manager()->RegisterDisplayRotationProperties(
rotation_locked_, current_rotation_);
}
void ScreenOrientationController::SetDisplayRotation(
display::Display::Rotation rotation,
display::Display::RotationSource source) {
if (!display::Display::HasInternalDisplay())
return;
current_rotation_ = rotation;
base::AutoReset<bool> auto_ignore_display_configuration_updates(
&ignore_display_configuration_updates_, true);
Shell::GetInstance()->display_configuration_controller()->SetDisplayRotation(
display::Display::InternalDisplayId(), rotation, source,
true /* user_action */);
}
void ScreenOrientationController::OnWindowActivated(
aura::client::ActivationChangeObserver::ActivationReason reason,
aura::Window* gained_active,
aura::Window* lost_active) {
ApplyLockForActiveWindow();
}
// Currently contents::WebContents will only be able to lock rotation while
// fullscreen. In this state a user cannot click on the tab strip to change. If
// this becomes supported for non-fullscreen tabs then the following interferes
// with TabDragController. OnWindowVisibilityChanged is called between a mouse
// down and mouse up. The rotation this triggers leads to a coordinate space
// change in the middle of an event. Causes the tab to separate from the tab
// strip.
void ScreenOrientationController::OnWindowVisibilityChanged(
aura::Window* window,
bool visible) {
if (locking_windows_.find(window) == locking_windows_.end())
return;
ApplyLockForActiveWindow();
}
void ScreenOrientationController::OnWindowDestroying(aura::Window* window) {
UnlockOrientationForWindow(window);
}
void ScreenOrientationController::OnAccelerometerUpdated(
scoped_refptr<const chromeos::AccelerometerUpdate> update) {
if (rotation_locked_ && !CanRotateInLockedState())
return;
if (!update->has(chromeos::ACCELEROMETER_SOURCE_SCREEN))
return;
// Ignore the reading if it appears unstable. The reading is considered
// unstable if it deviates too much from gravity
if (ui::IsAccelerometerReadingStable(*update,
chromeos::ACCELEROMETER_SOURCE_SCREEN)) {
HandleScreenRotation(update->get(chromeos::ACCELEROMETER_SOURCE_SCREEN));
}
}
void ScreenOrientationController::OnDisplayConfigurationChanged() {
if (ignore_display_configuration_updates_)
return;
if (!display::Display::HasInternalDisplay())
return;
DisplayManager* display_manager = Shell::GetInstance()->display_manager();
display::Display::Rotation user_rotation =
display_manager->GetDisplayInfo(display::Display::InternalDisplayId())
.GetActiveRotation();
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_ = current_rotation_ = user_rotation;
}
}
void ScreenOrientationController::OnMaximizeModeStarted() {
// Do not exit early, as the internal display can be determined after Maximize
// Mode has started. (chrome-os-partner:38796)
// Always start observing.
if (display::Display::HasInternalDisplay()) {
current_rotation_ = user_rotation_ =
Shell::GetInstance()
->display_manager()
->GetDisplayInfo(display::Display::InternalDisplayId())
.GetActiveRotation();
}
if (!rotation_locked_)
LoadDisplayRotationProperties();
chromeos::AccelerometerReader::GetInstance()->AddObserver(this);
Shell::GetInstance()->window_tree_host_manager()->AddObserver(this);
}
void ScreenOrientationController::OnMaximizeModeEnded() {
chromeos::AccelerometerReader::GetInstance()->RemoveObserver(this);
Shell::GetInstance()->window_tree_host_manager()->RemoveObserver(this);
if (current_rotation_ != user_rotation_)
SetDisplayRotation(user_rotation_, display::Display::ROTATION_SOURCE_USER);
}
void ScreenOrientationController::LockRotation(
display::Display::Rotation rotation,
display::Display::RotationSource source) {
SetRotationLocked(true);
SetDisplayRotation(rotation, source);
}
void ScreenOrientationController::LockRotationToOrientation(
blink::WebScreenOrientationLockType lock_orientation) {
rotation_locked_orientation_ = lock_orientation;
switch (lock_orientation) {
case blink::WebScreenOrientationLockAny:
SetRotationLocked(false);
break;
case blink::WebScreenOrientationLockDefault:
NOTREACHED();
break;
case blink::WebScreenOrientationLockPortraitPrimary:
LockRotationToPrimaryOrientation(blink::WebScreenOrientationLockPortrait);
break;
case blink::WebScreenOrientationLockLandscape:
case blink::WebScreenOrientationLockPortrait:
LockToRotationMatchingOrientation(lock_orientation);
break;
case blink::WebScreenOrientationLockPortraitSecondary:
LockRotationToSecondaryOrientation(
blink::WebScreenOrientationLockPortrait);
break;
case blink::WebScreenOrientationLockLandscapeSecondary:
LockRotationToSecondaryOrientation(
blink::WebScreenOrientationLockLandscape);
break;
case blink::WebScreenOrientationLockLandscapePrimary:
LockRotationToPrimaryOrientation(
blink::WebScreenOrientationLockLandscape);
break;
case blink::WebScreenOrientationLockNatural:
LockRotation(display::Display::ROTATE_0,
display::Display::ROTATION_SOURCE_ACTIVE);
break;
default:
NOTREACHED();
break;
}
}
void ScreenOrientationController::LockRotationToPrimaryOrientation(
blink::WebScreenOrientationLockType lock_orientation) {
LockRotation(natural_orientation_ == lock_orientation
? display::Display::ROTATE_0
: display::Display::ROTATE_90,
display::Display::ROTATION_SOURCE_ACTIVE);
}
void ScreenOrientationController::LockRotationToSecondaryOrientation(
blink::WebScreenOrientationLockType lock_orientation) {
LockRotation(natural_orientation_ == lock_orientation
? display::Display::ROTATE_180
: display::Display::ROTATE_270,
display::Display::ROTATION_SOURCE_ACTIVE);
}
void ScreenOrientationController::LockToRotationMatchingOrientation(
blink::WebScreenOrientationLockType lock_orientation) {
if (!display::Display::HasInternalDisplay())
return;
DisplayManager* display_manager = Shell::GetInstance()->display_manager();
display::Display::Rotation rotation =
display_manager->GetDisplayInfo(display::Display::InternalDisplayId())
.GetActiveRotation();
if (natural_orientation_ == lock_orientation) {
if (rotation == display::Display::ROTATE_0 ||
rotation == display::Display::ROTATE_180) {
SetRotationLocked(true);
} else {
LockRotation(display::Display::ROTATE_0,
display::Display::ROTATION_SOURCE_ACTIVE);
}
} else {
if (rotation == display::Display::ROTATE_90 ||
rotation == display::Display::ROTATE_270) {
SetRotationLocked(true);
} else {
LockRotation(display::Display::ROTATE_90,
display::Display::ROTATION_SOURCE_ACTIVE);
}
}
}
void ScreenOrientationController::HandleScreenRotation(
const chromeos::AccelerometerReading& lid) {
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_ == display::Display::ROTATE_0)
down.set_y(1.0f);
else if (current_rotation_ == display::Display::ROTATE_90)
down.set_x(1.0f);
else if (current_rotation_ == display::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 (gfx::AngleBetweenVectorsInDegrees(down, lid_flattened) <
kDisplayRotationStickyAngleDegrees) {
return;
}
float angle = gfx::ClockwiseAngleBetweenVectorsInDegrees(
rotation_reference, lid_flattened, gfx::Vector3dF(0.0f, 0.0f, 1.0f));
display::Display::Rotation new_rotation = display::Display::ROTATE_270;
if (angle < 90.0f)
new_rotation = display::Display::ROTATE_0;
else if (angle < 180.0f)
new_rotation = display::Display::ROTATE_90;
else if (angle < 270.0f)
new_rotation = display::Display::ROTATE_180;
if (new_rotation != current_rotation_ &&
IsRotationAllowedInLockedState(new_rotation)) {
SetDisplayRotation(new_rotation,
display::Display::ROTATION_SOURCE_ACCELEROMETER);
}
}
void ScreenOrientationController::LoadDisplayRotationProperties() {
DisplayManager* display_manager = Shell::GetInstance()->display_manager();
if (!display_manager->registered_internal_display_rotation_lock())
return;
SetDisplayRotation(display_manager->registered_internal_display_rotation(),
display::Display::ROTATION_SOURCE_ACCELEROMETER);
SetRotationLocked(true);
}
void ScreenOrientationController::ApplyLockForActiveWindow() {
aura::Window* active_window =
Shell::GetInstance()->activation_client()->GetActiveWindow();
for (auto const& windows : locking_windows_) {
if (windows.first->TargetVisibility() &&
active_window->Contains(windows.first)) {
LockRotationToOrientation(windows.second);
return;
}
}
SetRotationLocked(false);
}
bool ScreenOrientationController::IsRotationAllowedInLockedState(
display::Display::Rotation rotation) {
if (!rotation_locked_)
return true;
if (!CanRotateInLockedState())
return false;
if (natural_orientation_ == rotation_locked_orientation_) {
return rotation == display::Display::ROTATE_0 ||
rotation == display::Display::ROTATE_180;
} else {
return rotation == display::Display::ROTATE_90 ||
rotation == display::Display::ROTATE_270;
}
return false;
}
bool ScreenOrientationController::CanRotateInLockedState() {
return rotation_locked_orientation_ ==
blink::WebScreenOrientationLockLandscape ||
rotation_locked_orientation_ ==
blink::WebScreenOrientationLockPortrait;
}
} // namespace ash