src/ash/shelf/shelf_widget.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/shelf/shelf_widget.h"
   6
   7 #include "ash/ash_switches.h"
   8 #include "ash/focus_cycler.h"
   9 #include "ash/launcher/launcher_delegate.h"
  10 #include "ash/launcher/launcher_model.h"
  11 #include "ash/root_window_controller.h"
  12 #include "ash/session_state_delegate.h"
  13 #include "ash/shelf/shelf_layout_manager.h"
  14 #include "ash/shelf/shelf_navigator.h"
  15 #include "ash/shelf/shelf_view.h"
  16 #include "ash/shelf/shelf_widget.h"
  17 #include "ash/shell.h"
  18 #include "ash/shell_window_ids.h"
  19 #include "ash/system/tray/system_tray_delegate.h"
  20 #include "ash/wm/status_area_layout_manager.h"
  21 #include "ash/wm/window_properties.h"
  22 #include "ash/wm/workspace_controller.h"
  23 #include "grit/ash_resources.h"
  24 #include "ui/aura/client/activation_client.h"
  25 #include "ui/aura/root_window.h"
  26 #include "ui/aura/window.h"
  27 #include "ui/aura/window_observer.h"
  28 #include "ui/base/resource/resource_bundle.h"
  29 #include "ui/compositor/layer.h"
  30 #include "ui/compositor/scoped_layer_animation_settings.h"
  31 #include "ui/events/event_constants.h"
  32 #include "ui/gfx/canvas.h"
  33 #include "ui/gfx/image/image.h"
  34 #include "ui/gfx/image/image_skia_operations.h"
  35 #include "ui/gfx/skbitmap_operations.h"
  36 #include "ui/views/accessible_pane_view.h"
  37 #include "ui/views/widget/widget.h"
  38 #include "ui/views/widget/widget_delegate.h"
  39
  40 namespace {
  41 // Size of black border at bottom (or side) of launcher.
  42 const int kNumBlackPixels = 3;
  43 // Alpha to paint dimming image with.
  44 const int kDimAlpha = 128;
  45
  46 // The time to dim and un-dim.
  47 const int kTimeToDimMs = 3000;  // Slow in dimming.
  48 const int kTimeToUnDimMs = 200;  // Fast in activating.
  49 const int kTimeToSwitchBackgroundMs = 1000;
  50
  51 // Class used to slightly dim shelf items when maximized and visible.
  52 class DimmerView : public views::View,
  53                    public views::WidgetDelegate,
  54                    ash::internal::BackgroundAnimatorDelegate {
  55  public:
  56   // If |disable_dimming_animations_for_test| is set, all alpha animations will
  57   // be performed instantly.
  58   DimmerView(ash::ShelfWidget* shelf_widget,
  59              bool disable_dimming_animations_for_test);
  60   virtual ~DimmerView();
  61
  62   // Called by |DimmerEventFilter| when the mouse |hovered| state changes.
  63   void SetHovered(bool hovered);
  64
  65   // Force the dimmer to be undimmed.
  66   void ForceUndimming(bool force);
  67
  68   // views::WidgetDelegate overrides:
  69   virtual views::Widget* GetWidget() OVERRIDE {
  70     return View::GetWidget();
  71   }
  72   virtual const views::Widget* GetWidget() const OVERRIDE {
  73     return View::GetWidget();
  74   }
  75
  76   // ash::internal::BackgroundAnimatorDelegate overrides:
  77   virtual void UpdateBackground(int alpha) OVERRIDE {
  78     alpha_ = alpha;
  79     SchedulePaint();
  80   }
  81
  82   // views::View overrides:
  83   virtual void OnPaintBackground(gfx::Canvas* canvas) OVERRIDE;
  84
  85   // A function to test the current alpha used.
  86   int get_dimming_alpha_for_test() { return alpha_; }
  87
  88  private:
  89   // This class monitors mouse events to see if it is on top of the launcher.
  90   class DimmerEventFilter : public ui::EventHandler {
  91    public:
  92     explicit DimmerEventFilter(DimmerView* owner);
  93     virtual ~DimmerEventFilter();
  94
  95     // Overridden from ui::EventHandler:
  96     virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
  97     virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
  98
  99    private:
 100     // The owning class.
 101     DimmerView* owner_;
 102
 103     // TRUE if the mouse is inside the shelf.
 104     bool mouse_inside_;
 105
 106     // TRUE if a touch event is inside the shelf.
 107     bool touch_inside_;
 108
 109     DISALLOW_COPY_AND_ASSIGN(DimmerEventFilter);
 110   };
 111
 112   // The owning shelf.
 113   ash::ShelfWidget* shelf_;
 114
 115   // The alpha to use for covering the shelf.
 116   int alpha_;
 117
 118   // True if the event filter claims that we should not be dimmed.
 119   bool is_hovered_;
 120
 121   // True if someone forces us not to be dimmed (e.g. a menu is open).
 122   bool force_hovered_;
 123
 124   // True if animations should be suppressed for a test.
 125   bool disable_dimming_animations_for_test_;
 126
 127   // The animator for the background transitions.
 128   ash::internal::BackgroundAnimator background_animator_;
 129
 130   // Notification of entering / exiting of the shelf area by mouse.
 131   scoped_ptr<DimmerEventFilter> event_filter_;
 132
 133   DISALLOW_COPY_AND_ASSIGN(DimmerView);
 134 };
 135
 136 DimmerView::DimmerView(ash::ShelfWidget* shelf_widget,
 137                        bool disable_dimming_animations_for_test)
 138     : shelf_(shelf_widget),
 139       alpha_(kDimAlpha),
 140       is_hovered_(false),
 141       force_hovered_(false),
 142       disable_dimming_animations_for_test_(disable_dimming_animations_for_test),
 143       background_animator_(this, 0, kDimAlpha) {
 144   event_filter_.reset(new DimmerEventFilter(this));
 145   // Make sure it is undimmed at the beginning and then fire off the dimming
 146   // animation.
 147   background_animator_.SetPaintsBackground(false,
 148       ash::internal::BackgroundAnimator::CHANGE_IMMEDIATE);
 149   SetHovered(false);
 150 }
 151
 152 DimmerView::~DimmerView() {
 153 }
 154
 155 void DimmerView::SetHovered(bool hovered) {
 156   // Remember the hovered state so that we can correct the state once a
 157   // possible force state has disappeared.
 158   is_hovered_ = hovered;
 159   // Undimm also if we were forced to by e.g. an open menu.
 160   hovered |= force_hovered_;
 161   background_animator_.SetDuration(hovered ? kTimeToUnDimMs : kTimeToDimMs);
 162   background_animator_.SetPaintsBackground(!hovered,
 163       disable_dimming_animations_for_test_ ?
 164           ash::internal::BackgroundAnimator::CHANGE_IMMEDIATE :
 165           ash::internal::BackgroundAnimator::CHANGE_ANIMATE);
 166 }
 167
 168 void DimmerView::ForceUndimming(bool force) {
 169   bool previous = force_hovered_;
 170   force_hovered_ = force;
 171   // If the forced change does change the result we apply the change.
 172   if (is_hovered_ || force_hovered_ != is_hovered_ || previous)
 173     SetHovered(is_hovered_);
 174 }
 175
 176 void DimmerView::OnPaintBackground(gfx::Canvas* canvas) {
 177   SkPaint paint;
 178   ResourceBundle& rb = ResourceBundle::GetSharedInstance();
 179   gfx::ImageSkia launcher_background =
 180       *rb.GetImageNamed(IDR_AURA_LAUNCHER_DIMMING).ToImageSkia();
 181
 182   if (shelf_->GetAlignment() != ash::SHELF_ALIGNMENT_BOTTOM) {
 183     launcher_background = gfx::ImageSkiaOperations::CreateRotatedImage(
 184         launcher_background,
 185         shelf_->shelf_layout_manager()->SelectValueForShelfAlignment(
 186             SkBitmapOperations::ROTATION_90_CW,
 187             SkBitmapOperations::ROTATION_90_CW,
 188             SkBitmapOperations::ROTATION_270_CW,
 189             SkBitmapOperations::ROTATION_180_CW));
 190   }
 191   paint.setAlpha(alpha_);
 192   canvas->DrawImageInt(
 193       launcher_background,
 194       0, 0, launcher_background.width(), launcher_background.height(),
 195       0, 0, width(), height(),
 196       false,
 197       paint);
 198 }
 199
 200 DimmerView::DimmerEventFilter::DimmerEventFilter(DimmerView* owner)
 201     : owner_(owner),
 202       mouse_inside_(false),
 203       touch_inside_(false) {
 204   ash::Shell::GetInstance()->AddPreTargetHandler(this);
 205 }
 206
 207 DimmerView::DimmerEventFilter::~DimmerEventFilter() {
 208   ash::Shell::GetInstance()->RemovePreTargetHandler(this);
 209 }
 210
 211 void DimmerView::DimmerEventFilter::OnMouseEvent(ui::MouseEvent* event) {
 212   if (event->type() != ui::ET_MOUSE_MOVED &&
 213       event->type() != ui::ET_MOUSE_DRAGGED)
 214     return;
 215   bool inside = owner_->GetBoundsInScreen().Contains(event->root_location());
 216   if (mouse_inside_ || touch_inside_ != inside || touch_inside_)
 217     owner_->SetHovered(inside || touch_inside_);
 218   mouse_inside_ = inside;
 219 }
 220
 221 void DimmerView::DimmerEventFilter::OnTouchEvent(ui::TouchEvent* event) {
 222   bool touch_inside = false;
 223   if (event->type() != ui::ET_TOUCH_RELEASED &&
 224       event->type() != ui::ET_TOUCH_CANCELLED)
 225     touch_inside = owner_->GetBoundsInScreen().Contains(event->root_location());
 226
 227   if (mouse_inside_ || touch_inside_ != mouse_inside_ || touch_inside)
 228     owner_->SetHovered(mouse_inside_ || touch_inside);
 229   touch_inside_ = touch_inside;
 230 }
 231
 232 }  // namespace
 233
 234 namespace ash {
 235
 236 // The contents view of the Shelf. This view contains ShelfView and
 237 // sizes it to the width of the shelf minus the size of the status area.
 238 class ShelfWidget::DelegateView : public views::WidgetDelegate,
 239                                   public views::AccessiblePaneView,
 240                                   public internal::BackgroundAnimatorDelegate,
 241                                   public aura::WindowObserver {
 242  public:
 243   explicit DelegateView(ShelfWidget* shelf);
 244   virtual ~DelegateView();
 245
 246   void set_focus_cycler(internal::FocusCycler* focus_cycler) {
 247     focus_cycler_ = focus_cycler;
 248   }
 249   internal::FocusCycler* focus_cycler() {
 250     return focus_cycler_;
 251   }
 252
 253   ui::Layer* opaque_background() { return &opaque_background_; }
 254
 255   // Set if the shelf area is dimmed (eg when a window is maximized).
 256   void SetDimmed(bool dimmed);
 257   bool GetDimmed() const;
 258
 259   void SetParentLayer(ui::Layer* layer);
 260
 261   // views::View overrides:
 262   virtual void OnPaintBackground(gfx::Canvas* canvas) OVERRIDE;
 263
 264   // views::WidgetDelegateView overrides:
 265   virtual views::Widget* GetWidget() OVERRIDE {
 266     return View::GetWidget();
 267   }
 268   virtual const views::Widget* GetWidget() const OVERRIDE {
 269     return View::GetWidget();
 270   }
 271
 272   virtual bool CanActivate() const OVERRIDE;
 273   virtual void Layout() OVERRIDE;
 274   virtual void ReorderChildLayers(ui::Layer* parent_layer) OVERRIDE;
 275   // This will be called when the parent local bounds change.
 276   virtual void OnBoundsChanged(const gfx::Rect& old_bounds) OVERRIDE;
 277
 278   // aura::WindowObserver overrides:
 279   // This will be called when the shelf itself changes its absolute position.
 280   // Since the |dimmer_| panel needs to be placed in screen coordinates it needs
 281   // to be repositioned. The difference to the OnBoundsChanged call above is
 282   // that this gets also triggered when the shelf only moves.
 283   virtual void OnWindowBoundsChanged(aura::Window* window,
 284                                      const gfx::Rect& old_bounds,
 285                                      const gfx::Rect& new_bounds) OVERRIDE;
 286
 287   // BackgroundAnimatorDelegate overrides:
 288   virtual void UpdateBackground(int alpha) OVERRIDE;
 289
 290   // Force the shelf to be presented in an undimmed state.
 291   void ForceUndimming(bool force);
 292
 293   // A function to test the current alpha used by the dimming bar. If there is
 294   // no dimmer active, the function will return -1.
 295   int GetDimmingAlphaForTest();
 296
 297   // A function to test the bounds of the dimming bar. Returns gfx::Rect() if
 298   // the dimmer is inactive.
 299   gfx::Rect GetDimmerBoundsForTest();
 300
 301   // Disable dimming animations for running tests. This needs to be called
 302   // prior to the creation of of the |dimmer_|.
 303   void disable_dimming_animations_for_test() {
 304     disable_dimming_animations_for_test_ = true;
 305   }
 306
 307  private:
 308   ShelfWidget* shelf_;
 309   scoped_ptr<views::Widget> dimmer_;
 310   internal::FocusCycler* focus_cycler_;
 311   int alpha_;
 312   ui::Layer opaque_background_;
 313
 314   // The view which does the dimming.
 315   DimmerView* dimmer_view_;
 316
 317   // True if dimming animations should be turned off.
 318   bool disable_dimming_animations_for_test_;
 319
 320   DISALLOW_COPY_AND_ASSIGN(DelegateView);
 321 };
 322
 323 ShelfWidget::DelegateView::DelegateView(ShelfWidget* shelf)
 324     : shelf_(shelf),
 325       focus_cycler_(NULL),
 326       alpha_(0),
 327       opaque_background_(ui::LAYER_SOLID_COLOR),
 328       dimmer_view_(NULL),
 329       disable_dimming_animations_for_test_(false) {
 330   set_allow_deactivate_on_esc(true);
 331   opaque_background_.SetColor(SK_ColorBLACK);
 332   opaque_background_.SetBounds(GetLocalBounds());
 333   opaque_background_.SetOpacity(0.0f);
 334 }
 335
 336 ShelfWidget::DelegateView::~DelegateView() {
 337   // Make sure that the dimmer goes away since it might have set an observer.
 338   SetDimmed(false);
 339 }
 340
 341 void ShelfWidget::DelegateView::SetDimmed(bool value) {
 342   if (value == (dimmer_.get() != NULL))
 343     return;
 344
 345   if (value) {
 346     dimmer_.reset(new views::Widget);
 347     views::Widget::InitParams params(
 348         views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
 349     params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
 350     params.can_activate = false;
 351     params.accept_events = false;
 352     params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
 353     params.parent = shelf_->GetNativeView();
 354     dimmer_->Init(params);
 355     dimmer_->GetNativeWindow()->SetName("ShelfDimmer");
 356     dimmer_->SetBounds(shelf_->GetWindowBoundsInScreen());
 357     // The launcher should not take focus when it is initially shown.
 358     dimmer_->set_focus_on_creation(false);
 359     dimmer_view_ = new DimmerView(shelf_, disable_dimming_animations_for_test_);
 360     dimmer_->SetContentsView(dimmer_view_);
 361     dimmer_->GetNativeView()->SetName("ShelfDimmerView");
 362     dimmer_->Show();
 363     shelf_->GetNativeView()->AddObserver(this);
 364   } else {
 365     // Some unit tests will come here with a destroyed window.
 366     if (shelf_->GetNativeView())
 367       shelf_->GetNativeView()->RemoveObserver(this);
 368     dimmer_view_ = NULL;
 369     dimmer_.reset(NULL);
 370   }
 371 }
 372
 373 bool ShelfWidget::DelegateView::GetDimmed() const {
 374   return dimmer_.get() && dimmer_->IsVisible();
 375 }
 376
 377 void ShelfWidget::DelegateView::SetParentLayer(ui::Layer* layer) {
 378   layer->Add(&opaque_background_);
 379   ReorderLayers();
 380 }
 381
 382 void ShelfWidget::DelegateView::OnPaintBackground(gfx::Canvas* canvas) {
 383   ResourceBundle& rb = ResourceBundle::GetSharedInstance();
 384   gfx::ImageSkia launcher_background =
 385       *rb.GetImageSkiaNamed(IDR_AURA_LAUNCHER_BACKGROUND);
 386   if (SHELF_ALIGNMENT_BOTTOM != shelf_->GetAlignment())
 387     launcher_background = gfx::ImageSkiaOperations::CreateRotatedImage(
 388         launcher_background,
 389         shelf_->shelf_layout_manager()->SelectValueForShelfAlignment(
 390             SkBitmapOperations::ROTATION_90_CW,
 391             SkBitmapOperations::ROTATION_90_CW,
 392             SkBitmapOperations::ROTATION_270_CW,
 393             SkBitmapOperations::ROTATION_180_CW));
 394
 395   gfx::Rect black_rect =
 396       shelf_->shelf_layout_manager()->SelectValueForShelfAlignment(
 397           gfx::Rect(0, height() - kNumBlackPixels, width(), kNumBlackPixels),
 398           gfx::Rect(0, 0, kNumBlackPixels, height()),
 399           gfx::Rect(width() - kNumBlackPixels, 0, kNumBlackPixels, height()),
 400           gfx::Rect(0, 0, width(), kNumBlackPixels));
 401
 402   SkPaint paint;
 403   paint.setAlpha(alpha_);
 404   canvas->DrawImageInt(
 405       launcher_background,
 406       0, 0, launcher_background.width(), launcher_background.height(),
 407       0, 0, width(), height(),
 408       false,
 409       paint);
 410   canvas->FillRect(black_rect, SK_ColorBLACK);
 411 }
 412
 413 bool ShelfWidget::DelegateView::CanActivate() const {
 414   // Allow to activate as fallback.
 415   if (shelf_->activating_as_fallback_)
 416     return true;
 417   // Allow to activate from the focus cycler.
 418   if (focus_cycler_ && focus_cycler_->widget_activating() == GetWidget())
 419     return true;
 420   // Disallow activating in other cases, especially when using mouse.
 421   return false;
 422 }
 423
 424 void ShelfWidget::DelegateView::Layout() {
 425   for(int i = 0; i < child_count(); ++i) {
 426     if (shelf_->shelf_layout_manager()->IsHorizontalAlignment()) {
 427       child_at(i)->SetBounds(child_at(i)->x(), child_at(i)->y(),
 428                              child_at(i)->width(), height());
 429     } else {
 430       child_at(i)->SetBounds(child_at(i)->x(), child_at(i)->y(),
 431                              width(), child_at(i)->height());
 432     }
 433   }
 434 }
 435
 436 void ShelfWidget::DelegateView::ReorderChildLayers(ui::Layer* parent_layer) {
 437   views::View::ReorderChildLayers(parent_layer);
 438   parent_layer->StackAtBottom(&opaque_background_);
 439 }
 440
 441 void ShelfWidget::DelegateView::OnBoundsChanged(const gfx::Rect& old_bounds) {
 442   opaque_background_.SetBounds(GetLocalBounds());
 443   if (dimmer_)
 444     dimmer_->SetBounds(GetBoundsInScreen());
 445 }
 446
 447 void ShelfWidget::DelegateView::OnWindowBoundsChanged(
 448     aura::Window* window,
 449     const gfx::Rect& old_bounds,
 450     const gfx::Rect& new_bounds) {
 451   // Coming here the shelf got repositioned and since the |dimmer_| is placed
 452   // in screen coordinates and not relative to the parent it needs to be
 453   // repositioned accordingly.
 454   dimmer_->SetBounds(GetBoundsInScreen());
 455 }
 456
 457 void ShelfWidget::DelegateView::ForceUndimming(bool force) {
 458   if (GetDimmed())
 459     dimmer_view_->ForceUndimming(force);
 460 }
 461
 462 int ShelfWidget::DelegateView::GetDimmingAlphaForTest() {
 463   if (GetDimmed())
 464     return dimmer_view_->get_dimming_alpha_for_test();
 465   return -1;
 466 }
 467
 468 gfx::Rect ShelfWidget::DelegateView::GetDimmerBoundsForTest() {
 469   if (GetDimmed())
 470     return dimmer_view_->GetBoundsInScreen();
 471   return gfx::Rect();
 472 }
 473
 474 void ShelfWidget::DelegateView::UpdateBackground(int alpha) {
 475   alpha_ = alpha;
 476   SchedulePaint();
 477 }
 478
 479 ShelfWidget::ShelfWidget(aura::Window* shelf_container,
 480                          aura::Window* status_container,
 481                          internal::WorkspaceController* workspace_controller)
 482     : delegate_view_(new DelegateView(this)),
 483       background_animator_(delegate_view_, 0, kLauncherBackgroundAlpha),
 484       activating_as_fallback_(false),
 485       window_container_(shelf_container) {
 486   views::Widget::InitParams params(
 487       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
 488   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
 489   params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
 490   params.parent = shelf_container;
 491   params.delegate = delegate_view_;
 492   Init(params);
 493
 494   // The shelf should not take focus when initially shown.
 495   set_focus_on_creation(false);
 496   SetContentsView(delegate_view_);
 497   delegate_view_->SetParentLayer(GetLayer());
 498
 499   status_area_widget_ = new internal::StatusAreaWidget(status_container);
 500   status_area_widget_->CreateTrayViews();
 501   if (Shell::GetInstance()->session_state_delegate()->
 502           IsActiveUserSessionStarted()) {
 503     status_area_widget_->Show();
 504   }
 505   Shell::GetInstance()->focus_cycler()->AddWidget(status_area_widget_);
 506
 507   shelf_layout_manager_ = new internal::ShelfLayoutManager(this);
 508   shelf_container->SetLayoutManager(shelf_layout_manager_);
 509   shelf_layout_manager_->set_workspace_controller(workspace_controller);
 510   workspace_controller->SetShelf(shelf_layout_manager_);
 511
 512   status_container->SetLayoutManager(
 513       new internal::StatusAreaLayoutManager(this));
 514
 515   views::Widget::AddObserver(this);
 516 }
 517
 518 ShelfWidget::~ShelfWidget() {
 519   RemoveObserver(this);
 520 }
 521
 522 void ShelfWidget::SetPaintsBackground(
 523     ShelfBackgroundType background_type,
 524     internal::BackgroundAnimator::ChangeType change_type) {
 525   ui::Layer* opaque_background = delegate_view_->opaque_background();
 526   float target_opacity =
 527       (background_type == SHELF_BACKGROUND_MAXIMIZED) ? 1.0f : 0.0f;
 528   scoped_ptr<ui::ScopedLayerAnimationSettings> opaque_background_animation;
 529   if (change_type != internal::BackgroundAnimator::CHANGE_IMMEDIATE) {
 530     opaque_background_animation.reset(new ui::ScopedLayerAnimationSettings(
 531         opaque_background->GetAnimator()));
 532     opaque_background_animation->SetTransitionDuration(
 533         base::TimeDelta::FromMilliseconds(kTimeToSwitchBackgroundMs));
 534   }
 535   opaque_background->SetOpacity(target_opacity);
 536
 537   // TODO(mukai): use ui::Layer on both opaque_background and normal background
 538   // retire background_animator_ at all. It would be simpler.
 539   background_animator_.SetPaintsBackground(
 540       background_type != SHELF_BACKGROUND_DEFAULT,
 541       change_type);
 542 }
 543
 544 ShelfBackgroundType ShelfWidget::GetBackgroundType() const {
 545   if (delegate_view_->opaque_background()->GetTargetOpacity() == 1.0f)
 546     return SHELF_BACKGROUND_MAXIMIZED;
 547   if (background_animator_.paints_background())
 548     return SHELF_BACKGROUND_OVERLAP;
 549
 550   return SHELF_BACKGROUND_DEFAULT;
 551 }
 552
 553 // static
 554 bool ShelfWidget::ShelfAlignmentAllowed() {
 555   if (!ash::switches::ShowShelfAlignmentMenu())
 556     return false;
 557   user::LoginStatus login_status =
 558       Shell::GetInstance()->system_tray_delegate()->GetUserLoginStatus();
 559
 560   switch (login_status) {
 561     case user::LOGGED_IN_USER:
 562     case user::LOGGED_IN_OWNER:
 563       return true;
 564     case user::LOGGED_IN_LOCKED:
 565     case user::LOGGED_IN_PUBLIC:
 566     case user::LOGGED_IN_LOCALLY_MANAGED:
 567     case user::LOGGED_IN_GUEST:
 568     case user::LOGGED_IN_RETAIL_MODE:
 569     case user::LOGGED_IN_KIOSK_APP:
 570     case user::LOGGED_IN_NONE:
 571       return false;
 572   }
 573
 574   DCHECK(false);
 575   return false;
 576 }
 577
 578 ShelfAlignment ShelfWidget::GetAlignment() const {
 579   return shelf_layout_manager_->GetAlignment();
 580 }
 581
 582 void ShelfWidget::SetAlignment(ShelfAlignment alignment) {
 583   if (launcher_)
 584     launcher_->SetAlignment(alignment);
 585   status_area_widget_->SetShelfAlignment(alignment);
 586   delegate_view_->SchedulePaint();
 587 }
 588
 589 void ShelfWidget::SetDimsShelf(bool dimming) {
 590   delegate_view_->SetDimmed(dimming);
 591   // Repaint all children, allowing updates to reflect dimmed state eg:
 592   // status area background, app list button and overflow button.
 593   if (launcher_)
 594     launcher_->SchedulePaint();
 595   status_area_widget_->GetContentsView()->SchedulePaint();
 596 }
 597
 598 bool ShelfWidget::GetDimsShelf() const {
 599   return delegate_view_->GetDimmed();
 600 }
 601
 602 void ShelfWidget::CreateLauncher() {
 603   if (launcher_)
 604     return;
 605
 606   Shell* shell = Shell::GetInstance();
 607   // This needs to be called before launcher_model().
 608   LauncherDelegate* launcher_delegate = shell->GetLauncherDelegate();
 609   if (!launcher_delegate)
 610     return;  // Not ready to create Launcher
 611
 612   launcher_.reset(new Launcher(shell->launcher_model(),
 613                                shell->GetLauncherDelegate(),
 614                                this));
 615   SetFocusCycler(shell->focus_cycler());
 616
 617   // Inform the root window controller.
 618   internal::RootWindowController::ForWindow(window_container_)->
 619       OnLauncherCreated();
 620
 621   launcher_->SetVisible(
 622       shell->session_state_delegate()->IsActiveUserSessionStarted());
 623   shelf_layout_manager_->LayoutShelf();
 624   Show();
 625 }
 626
 627 bool ShelfWidget::IsLauncherVisible() const {
 628   return launcher_.get() && launcher_->IsVisible();
 629 }
 630
 631 void ShelfWidget::SetLauncherVisibility(bool visible) {
 632   if (launcher_)
 633     launcher_->SetVisible(visible);
 634 }
 635
 636 void ShelfWidget::SetFocusCycler(internal::FocusCycler* focus_cycler) {
 637   delegate_view_->set_focus_cycler(focus_cycler);
 638   if (focus_cycler)
 639     focus_cycler->AddWidget(this);
 640 }
 641
 642 internal::FocusCycler* ShelfWidget::GetFocusCycler() {
 643   return delegate_view_->focus_cycler();
 644 }
 645
 646 void ShelfWidget::ShutdownStatusAreaWidget() {
 647   if (status_area_widget_)
 648     status_area_widget_->Shutdown();
 649   status_area_widget_ = NULL;
 650 }
 651
 652 void ShelfWidget::ForceUndimming(bool force) {
 653   delegate_view_->ForceUndimming(force);
 654 }
 655
 656 void ShelfWidget::OnWidgetActivationChanged(views::Widget* widget,
 657                                             bool active) {
 658   activating_as_fallback_ = false;
 659   if (active)
 660     delegate_view_->SetPaneFocusAndFocusDefault();
 661   else
 662     delegate_view_->GetFocusManager()->ClearFocus();
 663 }
 664
 665 int ShelfWidget::GetDimmingAlphaForTest() {
 666   if (delegate_view_)
 667     return delegate_view_->GetDimmingAlphaForTest();
 668   return -1;
 669 }
 670
 671 gfx::Rect ShelfWidget::GetDimmerBoundsForTest() {
 672   if (delegate_view_)
 673     return delegate_view_->GetDimmerBoundsForTest();
 674   return gfx::Rect();
 675 }
 676
 677 void ShelfWidget::DisableDimmingAnimationsForTest() {
 678   DCHECK(delegate_view_);
 679   return delegate_view_->disable_dimming_animations_for_test();
 680 }
 681
 682 }  // namespace ash