src/ash/wm/session_state_animator.cc

   1 // Copyright (c) 2012 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 "ash/wm/session_state_animator.h"
   6
   7 #include "ash/shell.h"
   8 #include "ash/shell_window_ids.h"
   9 #include "ash/wm/window_animations.h"
  10 #include "ui/aura/client/aura_constants.h"
  11 #include "ui/aura/root_window.h"
  12 #include "ui/compositor/layer_animation_observer.h"
  13 #include "ui/compositor/layer_animation_sequence.h"
  14 #include "ui/compositor/scoped_layer_animation_settings.h"
  15 #include "ui/views/widget/widget.h"
  16
  17 namespace ash {
  18 namespace internal {
  19
  20 namespace {
  21
  22 // Slightly-smaller size that we scale the screen down to for the pre-lock and
  23 // pre-shutdown states.
  24 const float kSlowCloseSizeRatio = 0.95f;
  25
  26 // Maximum opacity of white layer when animating pre-shutdown state.
  27 const float kPartialFadeRatio = 0.3f;
  28
  29 // Minimum size. Not zero as it causes numeric issues.
  30 const float kMinimumScale = 1e-4f;
  31
  32 // Returns the transform that should be applied to containers for the slow-close
  33 // animation.
  34 gfx::Transform GetSlowCloseTransform() {
  35   gfx::Size root_size = Shell::GetPrimaryRootWindow()->bounds().size();
  36   gfx::Transform transform;
  37   transform.Translate(
  38       floor(0.5 * (1.0 - kSlowCloseSizeRatio) * root_size.width() + 0.5),
  39       floor(0.5 * (1.0 - kSlowCloseSizeRatio) * root_size.height() + 0.5));
  40   transform.Scale(kSlowCloseSizeRatio, kSlowCloseSizeRatio);
  41  return transform;
  42 }
  43
  44 // Returns the transform that should be applied to containers for the fast-close
  45 // animation.
  46 gfx::Transform GetFastCloseTransform() {
  47   gfx::Size root_size = Shell::GetPrimaryRootWindow()->bounds().size();
  48   gfx::Transform transform;
  49   transform.Translate(floor(0.5 * root_size.width() + 0.5),
  50                       floor(0.5 * root_size.height() + 0.5));
  51   transform.Scale(kMinimumScale, kMinimumScale);
  52   return transform;
  53 }
  54
  55 // Slowly shrinks |window| to a slightly-smaller size.
  56 void StartSlowCloseAnimationForWindow(aura::Window* window,
  57                                       base::TimeDelta duration,
  58                                       ui::LayerAnimationObserver* observer) {
  59   ui::LayerAnimator* animator = window->layer()->GetAnimator();
  60   animator->set_preemption_strategy(
  61       ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
  62   ui::LayerAnimationSequence* sequence = new ui::LayerAnimationSequence(
  63       ui::LayerAnimationElement::CreateTransformElement(
  64           GetSlowCloseTransform(),
  65           duration));
  66   if (observer)
  67     sequence->AddObserver(observer);
  68   animator->StartAnimation(sequence);
  69 }
  70
  71 // Quickly undoes the effects of the slow-close animation on |window|.
  72 void StartUndoSlowCloseAnimationForWindow(
  73     aura::Window* window,
  74     base::TimeDelta duration,
  75     ui::LayerAnimationObserver* observer) {
  76   ui::LayerAnimator* animator = window->layer()->GetAnimator();
  77   animator->set_preemption_strategy(
  78       ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
  79   ui::LayerAnimationSequence* sequence = new ui::LayerAnimationSequence(
  80       ui::LayerAnimationElement::CreateTransformElement(
  81           gfx::Transform(),
  82           duration));
  83   if (observer)
  84     sequence->AddObserver(observer);
  85   animator->StartAnimation(sequence);
  86 }
  87
  88 // Quickly shrinks |window| down to a point in the center of the screen and
  89 // fades it out to 0 opacity.
  90 void StartFastCloseAnimationForWindow(aura::Window* window,
  91                                       base::TimeDelta duration,
  92                                       ui::LayerAnimationObserver* observer) {
  93   ui::LayerAnimator* animator = window->layer()->GetAnimator();
  94   animator->set_preemption_strategy(
  95       ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
  96   animator->StartAnimation(
  97       new ui::LayerAnimationSequence(
  98           ui::LayerAnimationElement::CreateTransformElement(
  99               GetFastCloseTransform(), duration)));
 100   ui::LayerAnimationSequence* sequence = new ui::LayerAnimationSequence(
 101       ui::LayerAnimationElement::CreateOpacityElement(0.0, duration));
 102   if (observer)
 103     sequence->AddObserver(observer);
 104   animator->StartAnimation(sequence);
 105 }
 106
 107 // Fades |window| to |target_opacity| over |duration|.
 108 void StartPartialFadeAnimation(aura::Window* window,
 109                                float target_opacity,
 110                                base::TimeDelta duration,
 111                                ui::LayerAnimationObserver* observer) {
 112   ui::LayerAnimator* animator = window->layer()->GetAnimator();
 113   animator->set_preemption_strategy(
 114       ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
 115   ui::LayerAnimationSequence* sequence = new ui::LayerAnimationSequence(
 116       ui::LayerAnimationElement::CreateOpacityElement(
 117           target_opacity, duration));
 118   if (observer)
 119     sequence->AddObserver(observer);
 120   animator->StartAnimation(sequence);
 121 }
 122
 123 // Fades |window| to |opacity| over |duration|.
 124 void StartOpacityAnimationForWindow(aura::Window* window,
 125                                     float opacity,
 126                                     base::TimeDelta duration,
 127                                     ui::LayerAnimationObserver* observer) {
 128   ui::LayerAnimator* animator = window->layer()->GetAnimator();
 129   animator->set_preemption_strategy(
 130       ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
 131   ui::LayerAnimationSequence* sequence = new ui::LayerAnimationSequence(
 132       ui::LayerAnimationElement::CreateOpacityElement(opacity, duration));
 133   if (observer)
 134     sequence->AddObserver(observer);
 135   animator->StartAnimation(sequence);
 136 }
 137
 138 // Makes |window| fully transparent instantaneously.
 139 void HideWindowImmediately(aura::Window* window,
 140                            ui::LayerAnimationObserver* observer) {
 141   window->layer()->SetOpacity(0.0);
 142   if (observer)
 143     observer->OnLayerAnimationEnded(NULL);
 144 }
 145
 146 // Restores |window| to its original position and scale and full opacity
 147 // instantaneously.
 148 void RestoreWindow(aura::Window* window, ui::LayerAnimationObserver* observer) {
 149   window->layer()->SetTransform(gfx::Transform());
 150   window->layer()->SetOpacity(1.0);
 151   if (observer)
 152     observer->OnLayerAnimationEnded(NULL);
 153 }
 154
 155 void HideWindow(aura::Window* window,
 156                 base::TimeDelta duration,
 157                 bool above,
 158                 ui::LayerAnimationObserver* observer) {
 159   ui::Layer* layer = window->layer();
 160   ui::ScopedLayerAnimationSettings settings(layer->GetAnimator());
 161
 162   settings.SetPreemptionStrategy(
 163       ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
 164   settings.SetTransitionDuration(duration);
 165
 166   settings.SetTweenType(gfx::Tween::EASE_OUT);
 167   SetTransformForScaleAnimation(layer,
 168       above ? LAYER_SCALE_ANIMATION_ABOVE : LAYER_SCALE_ANIMATION_BELOW);
 169
 170   settings.SetTweenType(gfx::Tween::EASE_IN_OUT);
 171   layer->SetOpacity(0.0f);
 172
 173   // After the animation completes snap the transform back to the identity,
 174   // otherwise any one that asks for screen bounds gets a slightly scaled
 175   // version.
 176   settings.SetPreemptionStrategy(ui::LayerAnimator::ENQUEUE_NEW_ANIMATION);
 177   settings.SetTransitionDuration(base::TimeDelta());
 178   layer->SetTransform(gfx::Transform());
 179
 180   // A bit of a dirty trick: we need to catch the end of the animation we don't
 181   // control. So we use two facts we know: which animator will be used and the
 182   // target opacity to add "Do nothing" animation sequence.
 183   // Unfortunately, we can not just use empty LayerAnimationSequence, because
 184   // it does not call NotifyEnded().
 185   if (observer) {
 186     ui::LayerAnimationSequence* sequence = new ui::LayerAnimationSequence(
 187         ui::LayerAnimationElement::CreateOpacityElement(
 188             0.0, base::TimeDelta()));
 189       sequence->AddObserver(observer);
 190     layer->GetAnimator()->ScheduleAnimation(sequence);
 191   }
 192 }
 193
 194 // Animates |window| to identity transform and full opacity over |duration|.
 195 void TransformWindowToBaseState(aura::Window* window,
 196                                 base::TimeDelta duration,
 197                                 ui::LayerAnimationObserver* observer) {
 198   ui::Layer* layer = window->layer();
 199   ui::ScopedLayerAnimationSettings settings(layer->GetAnimator());
 200
 201   // Animate to target values.
 202   settings.SetPreemptionStrategy(
 203       ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
 204   settings.SetTransitionDuration(duration);
 205
 206   settings.SetTweenType(gfx::Tween::EASE_OUT);
 207   layer->SetTransform(gfx::Transform());
 208
 209   settings.SetTweenType(gfx::Tween::EASE_IN_OUT);
 210   layer->SetOpacity(1.0f);
 211
 212   // A bit of a dirty trick: we need to catch the end of the animation we don't
 213   // control. So we use two facts we know: which animator will be used and the
 214   // target opacity to add "Do nothing" animation sequence.
 215   // Unfortunately, we can not just use empty LayerAnimationSequence, because
 216   // it does not call NotifyEnded().
 217   if (observer) {
 218     ui::LayerAnimationSequence* sequence = new ui::LayerAnimationSequence(
 219         ui::LayerAnimationElement::CreateOpacityElement(
 220             1.0, base::TimeDelta()));
 221     sequence->AddObserver(observer);
 222     layer->GetAnimator()->ScheduleAnimation(sequence);
 223   }
 224 }
 225
 226 void ShowWindow(aura::Window* window,
 227                 base::TimeDelta duration,
 228                 bool above,
 229                 ui::LayerAnimationObserver* observer) {
 230   ui::Layer* layer = window->layer();
 231   ui::ScopedLayerAnimationSettings settings(layer->GetAnimator());
 232
 233   // Set initial state of animation
 234   settings.SetPreemptionStrategy(
 235       ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
 236   settings.SetTransitionDuration(base::TimeDelta());
 237   SetTransformForScaleAnimation(layer,
 238       above ? LAYER_SCALE_ANIMATION_ABOVE : LAYER_SCALE_ANIMATION_BELOW);
 239
 240   TransformWindowToBaseState(window, duration, observer);
 241 }
 242
 243 // Starts grayscale/brightness animation for |window| over |duration|. Target
 244 // value for both grayscale and brightness are specified by |target|.
 245 void StartGrayscaleBrightnessAnimationForWindow(
 246     aura::Window* window,
 247     float target,
 248     base::TimeDelta duration,
 249     gfx::Tween::Type tween_type,
 250     ui::LayerAnimationObserver* observer) {
 251   ui::LayerAnimator* animator = window->layer()->GetAnimator();
 252
 253   scoped_ptr<ui::LayerAnimationSequence> brightness_sequence(
 254       new ui::LayerAnimationSequence());
 255   scoped_ptr<ui::LayerAnimationSequence> grayscale_sequence(
 256       new ui::LayerAnimationSequence());
 257
 258   scoped_ptr<ui::LayerAnimationElement> brightness_element(
 259       ui::LayerAnimationElement::CreateBrightnessElement(
 260           target, duration));
 261   brightness_element->set_tween_type(tween_type);
 262   brightness_sequence->AddElement(brightness_element.release());
 263
 264   scoped_ptr<ui::LayerAnimationElement> grayscale_element(
 265       ui::LayerAnimationElement::CreateGrayscaleElement(
 266           target, duration));
 267   grayscale_element->set_tween_type(tween_type);
 268   grayscale_sequence->AddElement(grayscale_element.release());
 269
 270   std::vector<ui::LayerAnimationSequence*> animations;
 271   animations.push_back(brightness_sequence.release());
 272   animations.push_back(grayscale_sequence.release());
 273
 274   if (observer)
 275     animations[0]->AddObserver(observer);
 276
 277   animator->set_preemption_strategy(
 278       ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
 279
 280   animator->StartTogether(animations);
 281 }
 282
 283 // Animation observer that will drop animated foreground once animation is
 284 // finished. It is used in when undoing shutdown animation.
 285 class CallbackAnimationObserver : public ui::LayerAnimationObserver {
 286  public:
 287   explicit CallbackAnimationObserver(base::Callback<void(void)> &callback)
 288       : callback_(callback) {
 289   }
 290   virtual ~CallbackAnimationObserver() {
 291   }
 292
 293  private:
 294   // Overridden from ui::LayerAnimationObserver:
 295   virtual void OnLayerAnimationEnded(ui::LayerAnimationSequence* seq)
 296       OVERRIDE {
 297     // Drop foreground once animation is over.
 298     callback_.Run();
 299     delete this;
 300   }
 301
 302   virtual void OnLayerAnimationAborted(ui::LayerAnimationSequence* seq)
 303       OVERRIDE {
 304     // Drop foreground once animation is over.
 305     callback_.Run();
 306     delete this;
 307   }
 308
 309   virtual void OnLayerAnimationScheduled(ui::LayerAnimationSequence* seq)
 310       OVERRIDE {}
 311
 312   base::Callback<void(void)> callback_;
 313
 314   DISALLOW_COPY_AND_ASSIGN(CallbackAnimationObserver);
 315 };
 316
 317
 318 bool IsLayerAnimated(ui::Layer* layer,
 319                      SessionStateAnimator::AnimationType type) {
 320   switch (type) {
 321     case SessionStateAnimator::ANIMATION_PARTIAL_CLOSE:
 322       if (layer->GetTargetTransform() != GetSlowCloseTransform())
 323         return false;
 324       break;
 325     case SessionStateAnimator::ANIMATION_UNDO_PARTIAL_CLOSE:
 326       if (layer->GetTargetTransform() != gfx::Transform())
 327         return false;
 328       break;
 329     case SessionStateAnimator::ANIMATION_FULL_CLOSE:
 330       if (layer->GetTargetTransform() != GetFastCloseTransform() ||
 331           layer->GetTargetOpacity() > 0.0001)
 332         return false;
 333       break;
 334     case SessionStateAnimator::ANIMATION_FADE_IN:
 335       if (layer->GetTargetOpacity() < 0.9999)
 336         return false;
 337       break;
 338     case SessionStateAnimator::ANIMATION_FADE_OUT:
 339       if (layer->GetTargetOpacity() > 0.0001)
 340         return false;
 341       break;
 342     case SessionStateAnimator::ANIMATION_HIDE_IMMEDIATELY:
 343       if (layer->GetTargetOpacity() > 0.0001)
 344         return false;
 345       break;
 346     case SessionStateAnimator::ANIMATION_RESTORE:
 347       if (layer->opacity() < 0.9999 || layer->transform() != gfx::Transform())
 348         return false;
 349       break;
 350     case SessionStateAnimator::ANIMATION_GRAYSCALE_BRIGHTNESS:
 351       if ((layer->GetTargetBrightness() < 0.9999) ||
 352           (layer->GetTargetGrayscale() < 0.9999))
 353         return false;
 354       break;
 355     case SessionStateAnimator::ANIMATION_UNDO_GRAYSCALE_BRIGHTNESS:
 356       if ((layer->GetTargetBrightness() > 0.0001) ||
 357           (layer->GetTargetGrayscale() > 0.0001))
 358         return false;
 359       break;
 360     case SessionStateAnimator::ANIMATION_DROP:
 361     case SessionStateAnimator::ANIMATION_UNDO_LIFT:
 362       //ToDo(antim) : check other effects
 363       if (layer->GetTargetOpacity() < 0.9999)
 364         return false;
 365       break;
 366       //ToDo(antim) : check other effects
 367     case SessionStateAnimator::ANIMATION_LIFT:
 368       if (layer->GetTargetOpacity() > 0.0001)
 369         return false;
 370       break;
 371     case SessionStateAnimator::ANIMATION_RAISE_TO_SCREEN:
 372       //ToDo(antim) : check other effects
 373       if (layer->GetTargetOpacity() < 0.9999)
 374         return false;
 375       break;
 376       //ToDo(antim) : check other effects
 377     case SessionStateAnimator::ANIMATION_LOWER_BELOW_SCREEN:
 378       if (layer->GetTargetOpacity() > 0.0001)
 379         return false;
 380       break;
 381     default:
 382       NOTREACHED() << "Unhandled animation type " << type;
 383       return false;
 384   }
 385   return true;
 386 }
 387
 388 }  // namespace
 389
 390 bool SessionStateAnimator::TestApi::ContainersAreAnimated(
 391     int container_mask, AnimationType type) const {
 392   aura::Window::Windows containers;
 393   animator_->GetContainers(container_mask, &containers);
 394   for (aura::Window::Windows::const_iterator it = containers.begin();
 395        it != containers.end(); ++it) {
 396     aura::Window* window = *it;
 397     ui::Layer* layer = window->layer();
 398     if (!IsLayerAnimated(layer, type))
 399       return false;
 400   }
 401   return true;
 402 }
 403
 404 bool SessionStateAnimator::TestApi::RootWindowIsAnimated(AnimationType type)
 405     const {
 406   aura::Window* root_window = Shell::GetPrimaryRootWindow();
 407   ui::Layer* layer = root_window->layer();
 408   return IsLayerAnimated(layer, type);
 409 }
 410
 411 const int SessionStateAnimator::kAllLockScreenContainersMask =
 412     SessionStateAnimator::LOCK_SCREEN_BACKGROUND |
 413     SessionStateAnimator::LOCK_SCREEN_CONTAINERS |
 414     SessionStateAnimator::LOCK_SCREEN_RELATED_CONTAINERS;
 415
 416 const int SessionStateAnimator::kAllContainersMask =
 417     SessionStateAnimator::kAllLockScreenContainersMask |
 418     SessionStateAnimator::DESKTOP_BACKGROUND |
 419     SessionStateAnimator::LAUNCHER |
 420     SessionStateAnimator::NON_LOCK_SCREEN_CONTAINERS;
 421
 422 SessionStateAnimator::SessionStateAnimator() {
 423 }
 424
 425 SessionStateAnimator::~SessionStateAnimator() {
 426 }
 427
 428 base::TimeDelta SessionStateAnimator::GetDuration(AnimationSpeed speed) {
 429   switch (speed) {
 430     case ANIMATION_SPEED_IMMEDIATE:
 431       return base::TimeDelta();
 432     case ANIMATION_SPEED_UNDOABLE:
 433       return base::TimeDelta::FromMilliseconds(400);
 434     case ANIMATION_SPEED_REVERT:
 435       return base::TimeDelta::FromMilliseconds(150);
 436     case ANIMATION_SPEED_FAST:
 437       return base::TimeDelta::FromMilliseconds(150);
 438     case ANIMATION_SPEED_SHOW_LOCK_SCREEN:
 439       return base::TimeDelta::FromMilliseconds(200);
 440     case ANIMATION_SPEED_MOVE_WINDOWS:
 441       return base::TimeDelta::FromMilliseconds(350);
 442     case ANIMATION_SPEED_UNDO_MOVE_WINDOWS:
 443       return base::TimeDelta::FromMilliseconds(350);
 444     case ANIMATION_SPEED_SHUTDOWN:
 445       return base::TimeDelta::FromMilliseconds(1000);
 446     case ANIMATION_SPEED_REVERT_SHUTDOWN:
 447       return base::TimeDelta::FromMilliseconds(500);
 448   }
 449   // Satisfy compilers that do not understand that we will return from switch
 450   // above anyway.
 451   DCHECK(false) << "Unhandled animation speed " << speed;
 452   return base::TimeDelta();
 453 }
 454
 455 // Fills |containers| with the containers described by |container_mask|.
 456 void SessionStateAnimator::GetContainers(int container_mask,
 457                                          aura::Window::Windows* containers) {
 458   aura::Window* root_window = Shell::GetPrimaryRootWindow();
 459   containers->clear();
 460
 461   if (container_mask & DESKTOP_BACKGROUND) {
 462     containers->push_back(Shell::GetContainer(
 463         root_window,
 464         internal::kShellWindowId_DesktopBackgroundContainer));
 465   }
 466   if (container_mask & LAUNCHER) {
 467     containers->push_back(Shell::GetContainer(
 468         root_window,
 469         internal::kShellWindowId_ShelfContainer));
 470   }
 471   if (container_mask & NON_LOCK_SCREEN_CONTAINERS) {
 472     // TODO(antrim): Figure out a way to eliminate a need to exclude launcher
 473     // in such way.
 474     aura::Window* non_lock_screen_containers = Shell::GetContainer(
 475         root_window,
 476         internal::kShellWindowId_NonLockScreenContainersContainer);
 477     aura::Window::Windows children = non_lock_screen_containers->children();
 478
 479     for (aura::Window::Windows::const_iterator it = children.begin();
 480          it != children.end(); ++it) {
 481       aura::Window* window = *it;
 482       if (window->id() == internal::kShellWindowId_ShelfContainer)
 483         continue;
 484       containers->push_back(window);
 485     }
 486   }
 487   if (container_mask & LOCK_SCREEN_BACKGROUND) {
 488     containers->push_back(Shell::GetContainer(
 489         root_window,
 490         internal::kShellWindowId_LockScreenBackgroundContainer));
 491   }
 492   if (container_mask & LOCK_SCREEN_CONTAINERS) {
 493     containers->push_back(Shell::GetContainer(
 494         root_window,
 495         internal::kShellWindowId_LockScreenContainersContainer));
 496   }
 497   if (container_mask & LOCK_SCREEN_RELATED_CONTAINERS) {
 498     containers->push_back(Shell::GetContainer(
 499         root_window,
 500         internal::kShellWindowId_LockScreenRelatedContainersContainer));
 501   }
 502 }
 503
 504 void SessionStateAnimator::StartAnimation(int container_mask,
 505                                           AnimationType type,
 506                                           AnimationSpeed speed) {
 507   aura::Window::Windows containers;
 508   GetContainers(container_mask, &containers);
 509   for (aura::Window::Windows::const_iterator it = containers.begin();
 510        it != containers.end(); ++it) {
 511     RunAnimationForWindow(*it, type, speed, NULL);
 512   }
 513 }
 514
 515 void SessionStateAnimator::StartAnimationWithCallback(
 516     int container_mask,
 517     AnimationType type,
 518     AnimationSpeed speed,
 519     base::Callback<void(void)>& callback) {
 520   aura::Window::Windows containers;
 521   GetContainers(container_mask, &containers);
 522   for (aura::Window::Windows::const_iterator it = containers.begin();
 523        it != containers.end(); ++it) {
 524     ui::LayerAnimationObserver* observer =
 525         new CallbackAnimationObserver(callback);
 526     RunAnimationForWindow(*it, type, speed, observer);
 527   }
 528 }
 529
 530 void SessionStateAnimator::StartAnimationWithObserver(
 531     int container_mask,
 532     AnimationType type,
 533     AnimationSpeed speed,
 534     ui::LayerAnimationObserver* observer) {
 535   aura::Window::Windows containers;
 536   GetContainers(container_mask, &containers);
 537   for (aura::Window::Windows::const_iterator it = containers.begin();
 538        it != containers.end(); ++it) {
 539     RunAnimationForWindow(*it, type, speed, observer);
 540   }
 541 }
 542
 543 void SessionStateAnimator::StartGlobalAnimation(AnimationType type,
 544                                                 AnimationSpeed speed) {
 545   aura::Window* root_window = Shell::GetPrimaryRootWindow();
 546   RunAnimationForWindow(root_window, type, speed, NULL);
 547 }
 548
 549 void SessionStateAnimator::RunAnimationForWindow(
 550     aura::Window* window,
 551     AnimationType type,
 552     AnimationSpeed speed,
 553     ui::LayerAnimationObserver* observer) {
 554   base::TimeDelta duration = GetDuration(speed);
 555
 556   switch (type) {
 557     case ANIMATION_PARTIAL_CLOSE:
 558       StartSlowCloseAnimationForWindow(window, duration, observer);
 559       break;
 560     case ANIMATION_UNDO_PARTIAL_CLOSE:
 561       StartUndoSlowCloseAnimationForWindow(window, duration, observer);
 562       break;
 563     case ANIMATION_FULL_CLOSE:
 564       StartFastCloseAnimationForWindow(window, duration, observer);
 565       break;
 566     case ANIMATION_FADE_IN:
 567       StartOpacityAnimationForWindow(window, 1.0, duration, observer);
 568       break;
 569     case ANIMATION_FADE_OUT:
 570       StartOpacityAnimationForWindow(window, 0.0, duration, observer);
 571       break;
 572     case ANIMATION_HIDE_IMMEDIATELY:
 573       DCHECK_EQ(speed, ANIMATION_SPEED_IMMEDIATE);
 574       HideWindowImmediately(window, observer);
 575       break;
 576     case ANIMATION_RESTORE:
 577       DCHECK_EQ(speed, ANIMATION_SPEED_IMMEDIATE);
 578       RestoreWindow(window, observer);
 579       break;
 580     case ANIMATION_LIFT:
 581       HideWindow(window, duration, true, observer);
 582       break;
 583     case ANIMATION_DROP:
 584       ShowWindow(window, duration, true, observer);
 585       break;
 586     case ANIMATION_UNDO_LIFT:
 587       TransformWindowToBaseState(window, duration, observer);
 588       break;
 589     case ANIMATION_RAISE_TO_SCREEN:
 590       ShowWindow(window, duration, false, observer);
 591       break;
 592     case ANIMATION_LOWER_BELOW_SCREEN:
 593       HideWindow(window, duration, false, observer);
 594       break;
 595     case ANIMATION_PARTIAL_FADE_IN:
 596       StartPartialFadeAnimation(
 597           window, kPartialFadeRatio, duration, observer);
 598       break;
 599     case ANIMATION_UNDO_PARTIAL_FADE_IN:
 600       StartPartialFadeAnimation(window, 0.0, duration, observer);
 601       break;
 602     case ANIMATION_FULL_FADE_IN:
 603       StartPartialFadeAnimation(window, 1.0, duration, observer);
 604       break;
 605     case ANIMATION_GRAYSCALE_BRIGHTNESS:
 606       StartGrayscaleBrightnessAnimationForWindow(
 607           window, 1.0, duration, gfx::Tween::EASE_IN, observer);
 608       break;
 609     case ANIMATION_UNDO_GRAYSCALE_BRIGHTNESS:
 610       StartGrayscaleBrightnessAnimationForWindow(
 611           window, 0.0, duration, gfx::Tween::EASE_IN_OUT, observer);
 612       break;
 613   }
 614 }
 615
 616 void SessionStateAnimator::CreateForeground() {
 617   if (foreground_)
 618     return;
 619   aura::Window* window = Shell::GetContainer(
 620       Shell::GetPrimaryRootWindow(),
 621       internal::kShellWindowId_PowerButtonAnimationContainer);
 622   HideWindowImmediately(window, NULL);
 623   foreground_.reset(
 624       new ColoredWindowController(window, "SessionStateAnimatorForeground"));
 625   foreground_->SetColor(SK_ColorWHITE);
 626   foreground_->GetWidget()->Show();
 627 }
 628
 629 void SessionStateAnimator::DropForeground() {
 630   foreground_.reset();
 631 }
 632
 633 }  // namespace internal
 634 }  // namespace ash