Reenable triggering of screen rotations by sensors.

ui/aura/screen_rotation.cc

-// Copyright (c) 2011 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 "ui/aura/screen_rotation.h"
-
-#include "base/debug/trace_event.h"
-#include "base/time.h"
-#include "ui/gfx/compositor/layer_animation_delegate.h"
-#include "ui/gfx/interpolated_transform.h"
-#include "ui/gfx/rect.h"
-#include "ui/gfx/transform.h"
-
-namespace {
-
-const int k90DegreeTransitionDurationMs = 350;
-const int k180DegreeTransitionDurationMs = 550;
-
-base::TimeDelta GetTransitionDuration(int degrees) {
-  if (degrees == 180)
-    return base::TimeDelta::FromMilliseconds(k180DegreeTransitionDurationMs);
-  else if (degrees == 0)
-    return base::TimeDelta::FromMilliseconds(0);
-  return base::TimeDelta::FromMilliseconds(k90DegreeTransitionDurationMs);
-}
-
-}  // namespace
-
-ScreenRotation::ScreenRotation(int degrees)
-    : ui::LayerAnimationElement(GetProperties(),
-                                GetTransitionDuration(degrees)),
-      degrees_(degrees) {
-}
-
-ScreenRotation::~ScreenRotation() {
-}
-
-void ScreenRotation::OnStart(ui::LayerAnimationDelegate* delegate) {
-  //TRACE_EVENT0("ScreenRotation", "init");
-
-  // No rotation required.
-  if (degrees_ == 0)
-    return;
-
-  const ui::Transform& current_transform = delegate->GetTransformForAnimation();
-  const gfx::Rect& bounds = delegate->GetBoundsForAnimation();
-
-  gfx::Point old_pivot;
-  gfx::Point new_pivot;
-
-  int width = bounds.width();
-  int height = bounds.height();
-
-  switch (degrees_) {
-    case 90:
-      new_origin_ = new_pivot = gfx::Point(width, 0);
-      break;
-    case -90:
-      new_origin_ = new_pivot = gfx::Point(0, height);
-      break;
-    case 180:
-      new_pivot = old_pivot = gfx::Point(width / 2, height / 2);
-      new_origin_.SetPoint(width, height);
-      break;
-  }
-
-  // Convert points to world space.
-  current_transform.TransformPoint(old_pivot);
-  current_transform.TransformPoint(new_pivot);
-  current_transform.TransformPoint(new_origin_);
-
-  scoped_ptr<ui::InterpolatedTransform> rotation(
-      new ui::InterpolatedTransformAboutPivot(
-          old_pivot,
-          new ui::InterpolatedRotation(0, degrees_)));
-
-  scoped_ptr<ui::InterpolatedTransform> translation(
-      new ui::InterpolatedTranslation(
-          gfx::Point(0, 0),
-          gfx::Point(new_pivot.x() - old_pivot.x(),
-                     new_pivot.y() - old_pivot.y())));
-
-  float scale_factor = 0.9f;
-  scoped_ptr<ui::InterpolatedTransform> scale_down(
-      new ui::InterpolatedScale(1.0f, scale_factor, 0.0f, 0.5f));
-
-  scoped_ptr<ui::InterpolatedTransform> scale_up(
-      new ui::InterpolatedScale(1.0f, 1.0f / scale_factor, 0.5f, 1.0f));
-
-  interpolated_transform_.reset(
-      new ui::InterpolatedConstantTransform(current_transform));
-
-  scale_up->SetChild(scale_down.release());
-  translation->SetChild(scale_up.release());
-  rotation->SetChild(translation.release());
-  interpolated_transform_->SetChild(rotation.release());
-}
-
-void ScreenRotation::OnProgress(double t,
-                                ui::LayerAnimationDelegate* delegate) {
-  //TRACE_EVENT0("ScreenRotation", "Progress");
-  delegate->SetTransformFromAnimation(interpolated_transform_->Interpolate(t));
-  delegate->ScheduleDrawForAnimation();
-}
-
-void ScreenRotation::OnGetTarget(TargetValue* target) const {
-  target->transform = interpolated_transform_->Interpolate(1.0);
-}
-
-void ScreenRotation::OnAbort() {
-}
-
-// static
-const ui::LayerAnimationElement::AnimatableProperties&
-ScreenRotation::GetProperties() {
-  static LayerAnimationElement::AnimatableProperties properties;
-  if (properties.empty())
-    properties.insert(LayerAnimationElement::TRANSFORM);
-  return properties;
-}