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