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/root_window_controller.h"
  10 #include "ash/session_state_delegate.h"
  11 #include "ash/shelf/shelf_constants.h"
  12 #include "ash/shelf/shelf_delegate.h"
  13 #include "ash/shelf/shelf_layout_manager.h"
  14 #include "ash/shelf/shelf_model.h"
  15 #include "ash/shelf/shelf_navigator.h"
  16 #include "ash/shelf/shelf_view.h"
  17 #include "ash/shelf/shelf_widget.h"
  18 #include "ash/shell.h"
  19 #include "ash/shell_window_ids.h"
  20 #include "ash/system/tray/system_tray_delegate.h"
  21 #include "ash/wm/status_area_layout_manager.h"
  22 #include "ash/wm/window_properties.h"
  23 #include "ash/wm/workspace_controller.h"
  24 #include "grit/ash_resources.h"
  25 #include "ui/aura/client/activation_client.h"
  26 #include "ui/aura/root_window.h"
  27 #include "ui/aura/window.h"
  28 #include "ui/aura/window_observer.h"
  29 #include "ui/base/resource/resource_bundle.h"
  30 #include "ui/compositor/layer.h"
  31 #include "ui/compositor/scoped_layer_animation_settings.h"
  32 #include "ui/events/event_constants.h"
  33 #include "ui/gfx/canvas.h"
  34 #include "ui/gfx/image/image.h"
  35 #include "ui/gfx/image/image_skia_operations.h"
  36 #include "ui/gfx/skbitmap_operations.h"
  37 #include "ui/views/accessible_pane_view.h"
  38 #include "ui/views/widget/widget.h"
  39 #include "ui/views/widget/widget_delegate.h"
  40 #include "ui/wm/public/easy_resize_window_targeter.h"
  41
  42 namespace {
  43 // Size of black border at bottom (or side) of shelf.
  44 const int kNumBlackPixels = 3;
  45 // Alpha to paint dimming image with.
  46 const int kDimAlpha = 128;
  47
  48 // The time to dim and un-dim.
  49 const int kTimeToDimMs = 3000;  // Slow in dimming.
  50 const int kTimeToUnDimMs = 200;  // Fast in activating.
  51
  52 // Class used to slightly dim shelf items when maximized and visible.
  53 class DimmerView : public views::View,
  54                    public views::WidgetDelegate,
  55                    ash::internal::BackgroundAnimatorDelegate {
  56  public:
  57   // If |disable_dimming_animations_for_test| is set, all alpha animations will
  58   // be performed instantly.
  59   DimmerView(ash::ShelfWidget* shelf_widget,
  60              bool disable_dimming_animations_for_test);
  61   virtual ~DimmerView();
  62
  63   // Called by |DimmerEventFilter| when the mouse |hovered| state changes.
  64   void SetHovered(bool hovered);
  65
  66   // Force the dimmer to be undimmed.
  67   void ForceUndimming(bool force);
  68
  69   // views::WidgetDelegate overrides:
  70   virtual views::Widget* GetWidget() OVERRIDE {
  71     return View::GetWidget();
  72   }
  73   virtual const views::Widget* GetWidget() const OVERRIDE {
  74     return View::GetWidget();
  75   }
  76
  77   // ash::internal::BackgroundAnimatorDelegate overrides:
  78   virtual void UpdateBackground(int alpha) OVERRIDE {
  79     alpha_ = alpha;
  80     SchedulePaint();
  81   }
  82
  83   // views::View overrides:
  84   virtual void OnPaintBackground(gfx::Canvas* canvas) OVERRIDE;
  85
  86   // A function to test the current alpha used.
  87   int get_dimming_alpha_for_test() { return alpha_; }
  88
  89  private:
  90   // This class monitors mouse events to see if it is on top of the shelf.
  91   class DimmerEventFilter : public ui::EventHandler {
  92    public:
  93     explicit DimmerEventFilter(DimmerView* owner);
  94     virtual ~DimmerEventFilter();
  95
  96     // Overridden from ui::EventHandler:
  97     virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
  98     virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
  99
 100    private:
 101     // The owning class.
 102     DimmerView* owner_;
 103
 104     // TRUE if the mouse is inside the shelf.
 105     bool mouse_inside_;
 106
 107     // TRUE if a touch event is inside the shelf.
 108     bool touch_inside_;
 109
 110     DISALLOW_COPY_AND_ASSIGN(DimmerEventFilter);
 111   };
 112
 113   // The owning shelf.
 114   ash::ShelfWidget* shelf_;
 115
 116   // The alpha to use for covering the shelf.
 117   int alpha_;
 118
 119   // True if the event filter claims that we should not be dimmed.
 120   bool is_hovered_;
 121
 122   // True if someone forces us not to be dimmed (e.g. a menu is open).
 123   bool force_hovered_;
 124
 125   // True if animations should be suppressed for a test.
 126   bool disable_dimming_animations_for_test_;
 127
 128   // The animator for the background transitions.
 129   ash::internal::BackgroundAnimator background_animator_;
 130
 131   // Notification of entering / exiting of the shelf area by mouse.
 132   scoped_ptr<DimmerEventFilter> event_filter_;
 133
 134   DISALLOW_COPY_AND_ASSIGN(DimmerView);
 135 };
 136
 137 DimmerView::DimmerView(ash::ShelfWidget* shelf_widget,
 138                        bool disable_dimming_animations_for_test)
 139     : shelf_(shelf_widget),
 140       alpha_(kDimAlpha),
 141       is_hovered_(false),
 142       force_hovered_(false),
 143       disable_dimming_animations_for_test_(disable_dimming_animations_for_test),
 144       background_animator_(this, 0, kDimAlpha) {
 145   event_filter_.reset(new DimmerEventFilter(this));
 146   // Make sure it is undimmed at the beginning and then fire off the dimming
 147   // animation.
 148   background_animator_.SetPaintsBackground(false,
 149                                            ash::BACKGROUND_CHANGE_IMMEDIATE);
 150   SetHovered(false);
 151 }
 152
 153 DimmerView::~DimmerView() {
 154 }
 155
 156 void DimmerView::SetHovered(bool hovered) {
 157   // Remember the hovered state so that we can correct the state once a
 158   // possible force state has disappeared.
 159   is_hovered_ = hovered;
 160   // Undimm also if we were forced to by e.g. an open menu.
 161   hovered |= force_hovered_;
 162   background_animator_.SetDuration(hovered ? kTimeToUnDimMs : kTimeToDimMs);
 163   background_animator_.SetPaintsBackground(!hovered,
 164       disable_dimming_animations_for_test_ ?
 165           ash::BACKGROUND_CHANGE_IMMEDIATE : ash::BACKGROUND_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 shelf_background =
 180       *rb.GetImageNamed(IDR_AURA_LAUNCHER_DIMMING).ToImageSkia();
 181
 182   if (shelf_->GetAlignment() != ash::SHELF_ALIGNMENT_BOTTOM) {
 183     shelf_background = gfx::ImageSkiaOperations::CreateRotatedImage(
 184         shelf_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(shelf_background,
 193                        0,
 194                        0,
 195                        shelf_background.width(),
 196                        shelf_background.height(),
 197                        0,
 198                        0,
 199                        width(),
 200                        height(),
 201                        false,
 202                        paint);
 203 }
 204
 205 DimmerView::DimmerEventFilter::DimmerEventFilter(DimmerView* owner)
 206     : owner_(owner),
 207       mouse_inside_(false),
 208       touch_inside_(false) {
 209   ash::Shell::GetInstance()->AddPreTargetHandler(this);
 210 }
 211
 212 DimmerView::DimmerEventFilter::~DimmerEventFilter() {
 213   ash::Shell::GetInstance()->RemovePreTargetHandler(this);
 214 }
 215
 216 void DimmerView::DimmerEventFilter::OnMouseEvent(ui::MouseEvent* event) {
 217   if (event->type() != ui::ET_MOUSE_MOVED &&
 218       event->type() != ui::ET_MOUSE_DRAGGED)
 219     return;
 220   bool inside = owner_->GetBoundsInScreen().Contains(event->root_location());
 221   if (mouse_inside_ || touch_inside_ != inside || touch_inside_)
 222     owner_->SetHovered(inside || touch_inside_);
 223   mouse_inside_ = inside;
 224 }
 225
 226 void DimmerView::DimmerEventFilter::OnTouchEvent(ui::TouchEvent* event) {
 227   bool touch_inside = false;
 228   if (event->type() != ui::ET_TOUCH_RELEASED &&
 229       event->type() != ui::ET_TOUCH_CANCELLED)
 230     touch_inside = owner_->GetBoundsInScreen().Contains(event->root_location());
 231
 232   if (mouse_inside_ || touch_inside_ != mouse_inside_ || touch_inside)
 233     owner_->SetHovered(mouse_inside_ || touch_inside);
 234   touch_inside_ = touch_inside;
 235 }
 236
 237 using ash::internal::ShelfLayoutManager;
 238
 239 // ShelfWindowTargeter makes it easier to resize windows with the mouse when the
 240 // window-edge slightly overlaps with the shelf edge. The targeter also makes it
 241 // easier to drag the shelf out with touch while it is hidden.
 242 class ShelfWindowTargeter : public wm::EasyResizeWindowTargeter,
 243                             public ash::ShelfLayoutManagerObserver {
 244  public:
 245   ShelfWindowTargeter(aura::Window* container,
 246                       ShelfLayoutManager* shelf)
 247       : wm::EasyResizeWindowTargeter(container, gfx::Insets(), gfx::Insets()),
 248         shelf_(shelf) {
 249     WillChangeVisibilityState(shelf_->visibility_state());
 250     shelf_->AddObserver(this);
 251   }
 252
 253   virtual ~ShelfWindowTargeter() {
 254     // |shelf_| may have been destroyed by this time.
 255     if (shelf_)
 256       shelf_->RemoveObserver(this);
 257   }
 258
 259  private:
 260   gfx::Insets GetInsetsForAlignment(int distance,
 261                                     ash::ShelfAlignment alignment) {
 262     switch (alignment) {
 263       case ash::SHELF_ALIGNMENT_BOTTOM:
 264         return gfx::Insets(distance, 0, 0, 0);
 265       case ash::SHELF_ALIGNMENT_LEFT:
 266         return gfx::Insets(0, 0, 0, distance);
 267       case ash::SHELF_ALIGNMENT_RIGHT:
 268         return gfx::Insets(0, distance, 0, 0);
 269       case ash::SHELF_ALIGNMENT_TOP:
 270         return gfx::Insets(0, 0, distance, 0);
 271     }
 272     NOTREACHED();
 273     return gfx::Insets();
 274   }
 275
 276   // ash::ShelfLayoutManagerObserver:
 277   virtual void WillDeleteShelf() OVERRIDE {
 278     shelf_ = NULL;
 279   }
 280
 281   virtual void WillChangeVisibilityState(
 282       ash::ShelfVisibilityState new_state) OVERRIDE {
 283     gfx::Insets mouse_insets;
 284     gfx::Insets touch_insets;
 285     if (new_state == ash::SHELF_VISIBLE) {
 286       // Let clicks at the very top of the shelf through so windows can be
 287       // resized with the bottom-right corner and bottom edge.
 288       mouse_insets = GetInsetsForAlignment(
 289           ShelfLayoutManager::kWorkspaceAreaVisibleInset,
 290           shelf_->GetAlignment());
 291     } else if (new_state == ash::SHELF_AUTO_HIDE) {
 292       // Extend the touch hit target out a bit to allow users to drag shelf out
 293       // while hidden.
 294       touch_insets = GetInsetsForAlignment(
 295           -ShelfLayoutManager::kWorkspaceAreaAutoHideInset,
 296           shelf_->GetAlignment());
 297     }
 298
 299     set_mouse_extend(mouse_insets);
 300     set_touch_extend(touch_insets);
 301   }
 302
 303   ShelfLayoutManager* shelf_;
 304
 305   DISALLOW_COPY_AND_ASSIGN(ShelfWindowTargeter);
 306 };
 307
 308 }  // namespace
 309
 310 namespace ash {
 311
 312 // The contents view of the Shelf. This view contains ShelfView and
 313 // sizes it to the width of the shelf minus the size of the status area.
 314 class ShelfWidget::DelegateView : public views::WidgetDelegate,
 315                                   public views::AccessiblePaneView,
 316                                   public internal::BackgroundAnimatorDelegate,
 317                                   public aura::WindowObserver {
 318  public:
 319   explicit DelegateView(ShelfWidget* shelf);
 320   virtual ~DelegateView();
 321
 322   void set_focus_cycler(internal::FocusCycler* focus_cycler) {
 323     focus_cycler_ = focus_cycler;
 324   }
 325   internal::FocusCycler* focus_cycler() {
 326     return focus_cycler_;
 327   }
 328
 329   ui::Layer* opaque_background() { return &opaque_background_; }
 330
 331   // Set if the shelf area is dimmed (eg when a window is maximized).
 332   void SetDimmed(bool dimmed);
 333   bool GetDimmed() const;
 334
 335   void SetParentLayer(ui::Layer* layer);
 336
 337   // views::View overrides:
 338   virtual void OnPaintBackground(gfx::Canvas* canvas) OVERRIDE;
 339
 340   // views::WidgetDelegateView overrides:
 341   virtual views::Widget* GetWidget() OVERRIDE {
 342     return View::GetWidget();
 343   }
 344   virtual const views::Widget* GetWidget() const OVERRIDE {
 345     return View::GetWidget();
 346   }
 347
 348   virtual bool CanActivate() const OVERRIDE;
 349   virtual void Layout() OVERRIDE;
 350   virtual void ReorderChildLayers(ui::Layer* parent_layer) OVERRIDE;
 351   // This will be called when the parent local bounds change.
 352   virtual void OnBoundsChanged(const gfx::Rect& old_bounds) OVERRIDE;
 353
 354   // aura::WindowObserver overrides:
 355   // This will be called when the shelf itself changes its absolute position.
 356   // Since the |dimmer_| panel needs to be placed in screen coordinates it needs
 357   // to be repositioned. The difference to the OnBoundsChanged call above is
 358   // that this gets also triggered when the shelf only moves.
 359   virtual void OnWindowBoundsChanged(aura::Window* window,
 360                                      const gfx::Rect& old_bounds,
 361                                      const gfx::Rect& new_bounds) OVERRIDE;
 362
 363   // BackgroundAnimatorDelegate overrides:
 364   virtual void UpdateBackground(int alpha) OVERRIDE;
 365
 366   // Force the shelf to be presented in an undimmed state.
 367   void ForceUndimming(bool force);
 368
 369   // A function to test the current alpha used by the dimming bar. If there is
 370   // no dimmer active, the function will return -1.
 371   int GetDimmingAlphaForTest();
 372
 373   // A function to test the bounds of the dimming bar. Returns gfx::Rect() if
 374   // the dimmer is inactive.
 375   gfx::Rect GetDimmerBoundsForTest();
 376
 377   // Disable dimming animations for running tests. This needs to be called
 378   // prior to the creation of of the |dimmer_|.
 379   void disable_dimming_animations_for_test() {
 380     disable_dimming_animations_for_test_ = true;
 381   }
 382
 383  private:
 384   ShelfWidget* shelf_;
 385   scoped_ptr<views::Widget> dimmer_;
 386   internal::FocusCycler* focus_cycler_;
 387   int alpha_;
 388   ui::Layer opaque_background_;
 389
 390   // The view which does the dimming.
 391   DimmerView* dimmer_view_;
 392
 393   // True if dimming animations should be turned off.
 394   bool disable_dimming_animations_for_test_;
 395
 396   DISALLOW_COPY_AND_ASSIGN(DelegateView);
 397 };
 398
 399 ShelfWidget::DelegateView::DelegateView(ShelfWidget* shelf)
 400     : shelf_(shelf),
 401       focus_cycler_(NULL),
 402       alpha_(0),
 403       opaque_background_(ui::LAYER_SOLID_COLOR),
 404       dimmer_view_(NULL),
 405       disable_dimming_animations_for_test_(false) {
 406   set_allow_deactivate_on_esc(true);
 407   opaque_background_.SetColor(SK_ColorBLACK);
 408   opaque_background_.SetBounds(GetLocalBounds());
 409   opaque_background_.SetOpacity(0.0f);
 410 }
 411
 412 ShelfWidget::DelegateView::~DelegateView() {
 413   // Make sure that the dimmer goes away since it might have set an observer.
 414   SetDimmed(false);
 415 }
 416
 417 void ShelfWidget::DelegateView::SetDimmed(bool value) {
 418   if (value == (dimmer_.get() != NULL))
 419     return;
 420
 421   if (value) {
 422     dimmer_.reset(new views::Widget);
 423     views::Widget::InitParams params(
 424         views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
 425     params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
 426     params.can_activate = false;
 427     params.accept_events = false;
 428     params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
 429     params.parent = shelf_->GetNativeView();
 430     dimmer_->Init(params);
 431     dimmer_->GetNativeWindow()->SetName("ShelfDimmer");
 432     dimmer_->SetBounds(shelf_->GetWindowBoundsInScreen());
 433     // The shelf should not take focus when it is initially shown.
 434     dimmer_->set_focus_on_creation(false);
 435     dimmer_view_ = new DimmerView(shelf_, disable_dimming_animations_for_test_);
 436     dimmer_->SetContentsView(dimmer_view_);
 437     dimmer_->GetNativeView()->SetName("ShelfDimmerView");
 438     dimmer_->Show();
 439     shelf_->GetNativeView()->AddObserver(this);
 440   } else {
 441     // Some unit tests will come here with a destroyed window.
 442     if (shelf_->GetNativeView())
 443       shelf_->GetNativeView()->RemoveObserver(this);
 444     dimmer_view_ = NULL;
 445     dimmer_.reset(NULL);
 446   }
 447 }
 448
 449 bool ShelfWidget::DelegateView::GetDimmed() const {
 450   return dimmer_.get() && dimmer_->IsVisible();
 451 }
 452
 453 void ShelfWidget::DelegateView::SetParentLayer(ui::Layer* layer) {
 454   layer->Add(&opaque_background_);
 455   ReorderLayers();
 456 }
 457
 458 void ShelfWidget::DelegateView::OnPaintBackground(gfx::Canvas* canvas) {
 459   ResourceBundle& rb = ResourceBundle::GetSharedInstance();
 460   gfx::ImageSkia shelf_background =
 461       *rb.GetImageSkiaNamed(IDR_AURA_LAUNCHER_BACKGROUND);
 462   if (SHELF_ALIGNMENT_BOTTOM != shelf_->GetAlignment())
 463     shelf_background = gfx::ImageSkiaOperations::CreateRotatedImage(
 464         shelf_background,
 465         shelf_->shelf_layout_manager()->SelectValueForShelfAlignment(
 466             SkBitmapOperations::ROTATION_90_CW,
 467             SkBitmapOperations::ROTATION_90_CW,
 468             SkBitmapOperations::ROTATION_270_CW,
 469             SkBitmapOperations::ROTATION_180_CW));
 470   const gfx::Rect dock_bounds(shelf_->shelf_layout_manager()->dock_bounds());
 471   SkPaint paint;
 472   paint.setAlpha(alpha_);
 473   canvas->DrawImageInt(shelf_background,
 474                        0,
 475                        0,
 476                        shelf_background.width(),
 477                        shelf_background.height(),
 478                        (SHELF_ALIGNMENT_BOTTOM == shelf_->GetAlignment() &&
 479                         dock_bounds.x() == 0 && dock_bounds.width() > 0)
 480                            ? dock_bounds.width()
 481                            : 0,
 482                        0,
 483                        SHELF_ALIGNMENT_BOTTOM == shelf_->GetAlignment()
 484                            ? width() - dock_bounds.width()
 485                            : width(),
 486                        height(),
 487                        false,
 488                        paint);
 489   if (SHELF_ALIGNMENT_BOTTOM == shelf_->GetAlignment() &&
 490       dock_bounds.width() > 0) {
 491     // The part of the shelf background that is in the corner below the docked
 492     // windows close to the work area is an arched gradient that blends
 493     // vertically oriented docked background and horizontal shelf.
 494     gfx::ImageSkia shelf_corner =
 495         *rb.GetImageSkiaNamed(IDR_AURA_LAUNCHER_CORNER);
 496     if (dock_bounds.x() == 0) {
 497       shelf_corner = gfx::ImageSkiaOperations::CreateRotatedImage(
 498           shelf_corner, SkBitmapOperations::ROTATION_90_CW);
 499     }
 500     canvas->DrawImageInt(
 501         shelf_corner,
 502         0,
 503         0,
 504         shelf_corner.width(),
 505         shelf_corner.height(),
 506         dock_bounds.x() > 0 ? dock_bounds.x() : dock_bounds.width() - height(),
 507         0,
 508         height(),
 509         height(),
 510         false,
 511         paint);
 512     // The part of the shelf background that is just below the docked windows
 513     // is drawn using the last (lowest) 1-pixel tall strip of the image asset.
 514     // This avoids showing the border 3D shadow between the shelf and the dock.
 515     canvas->DrawImageInt(shelf_background,
 516                          0,
 517                          shelf_background.height() - 1,
 518                          shelf_background.width(),
 519                          1,
 520                          dock_bounds.x() > 0 ? dock_bounds.x() + height() : 0,
 521                          0,
 522                          dock_bounds.width() - height(),
 523                          height(),
 524                          false,
 525                          paint);
 526   }
 527   gfx::Rect black_rect =
 528       shelf_->shelf_layout_manager()->SelectValueForShelfAlignment(
 529           gfx::Rect(0, height() - kNumBlackPixels, width(), kNumBlackPixels),
 530           gfx::Rect(0, 0, kNumBlackPixels, height()),
 531           gfx::Rect(width() - kNumBlackPixels, 0, kNumBlackPixels, height()),
 532           gfx::Rect(0, 0, width(), kNumBlackPixels));
 533   canvas->FillRect(black_rect, SK_ColorBLACK);
 534 }
 535
 536 bool ShelfWidget::DelegateView::CanActivate() const {
 537   // Allow to activate as fallback.
 538   if (shelf_->activating_as_fallback_)
 539     return true;
 540   // Allow to activate from the focus cycler.
 541   if (focus_cycler_ && focus_cycler_->widget_activating() == GetWidget())
 542     return true;
 543   // Disallow activating in other cases, especially when using mouse.
 544   return false;
 545 }
 546
 547 void ShelfWidget::DelegateView::Layout() {
 548   for(int i = 0; i < child_count(); ++i) {
 549     if (shelf_->shelf_layout_manager()->IsHorizontalAlignment()) {
 550       child_at(i)->SetBounds(child_at(i)->x(), child_at(i)->y(),
 551                              child_at(i)->width(), height());
 552     } else {
 553       child_at(i)->SetBounds(child_at(i)->x(), child_at(i)->y(),
 554                              width(), child_at(i)->height());
 555     }
 556   }
 557 }
 558
 559 void ShelfWidget::DelegateView::ReorderChildLayers(ui::Layer* parent_layer) {
 560   views::View::ReorderChildLayers(parent_layer);
 561   parent_layer->StackAtBottom(&opaque_background_);
 562 }
 563
 564 void ShelfWidget::DelegateView::OnBoundsChanged(const gfx::Rect& old_bounds) {
 565   opaque_background_.SetBounds(GetLocalBounds());
 566   if (dimmer_)
 567     dimmer_->SetBounds(GetBoundsInScreen());
 568 }
 569
 570 void ShelfWidget::DelegateView::OnWindowBoundsChanged(
 571     aura::Window* window,
 572     const gfx::Rect& old_bounds,
 573     const gfx::Rect& new_bounds) {
 574   // Coming here the shelf got repositioned and since the |dimmer_| is placed
 575   // in screen coordinates and not relative to the parent it needs to be
 576   // repositioned accordingly.
 577   dimmer_->SetBounds(GetBoundsInScreen());
 578 }
 579
 580 void ShelfWidget::DelegateView::ForceUndimming(bool force) {
 581   if (GetDimmed())
 582     dimmer_view_->ForceUndimming(force);
 583 }
 584
 585 int ShelfWidget::DelegateView::GetDimmingAlphaForTest() {
 586   if (GetDimmed())
 587     return dimmer_view_->get_dimming_alpha_for_test();
 588   return -1;
 589 }
 590
 591 gfx::Rect ShelfWidget::DelegateView::GetDimmerBoundsForTest() {
 592   if (GetDimmed())
 593     return dimmer_view_->GetBoundsInScreen();
 594   return gfx::Rect();
 595 }
 596
 597 void ShelfWidget::DelegateView::UpdateBackground(int alpha) {
 598   alpha_ = alpha;
 599   SchedulePaint();
 600 }
 601
 602 ShelfWidget::ShelfWidget(aura::Window* shelf_container,
 603                          aura::Window* status_container,
 604                          internal::WorkspaceController* workspace_controller)
 605     : delegate_view_(new DelegateView(this)),
 606       background_animator_(delegate_view_, 0, kShelfBackgroundAlpha),
 607       activating_as_fallback_(false),
 608       window_container_(shelf_container) {
 609   views::Widget::InitParams params(
 610       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
 611   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
 612   params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
 613   params.parent = shelf_container;
 614   params.delegate = delegate_view_;
 615   Init(params);
 616
 617   // The shelf should not take focus when initially shown.
 618   set_focus_on_creation(false);
 619   SetContentsView(delegate_view_);
 620   delegate_view_->SetParentLayer(GetLayer());
 621
 622   status_area_widget_ = new internal::StatusAreaWidget(status_container);
 623   status_area_widget_->CreateTrayViews();
 624   if (Shell::GetInstance()->session_state_delegate()->
 625           IsActiveUserSessionStarted()) {
 626     status_area_widget_->Show();
 627   }
 628   Shell::GetInstance()->focus_cycler()->AddWidget(status_area_widget_);
 629
 630   shelf_layout_manager_ = new internal::ShelfLayoutManager(this);
 631   shelf_layout_manager_->AddObserver(this);
 632   shelf_container->SetLayoutManager(shelf_layout_manager_);
 633   shelf_layout_manager_->set_workspace_controller(workspace_controller);
 634   workspace_controller->SetShelf(shelf_layout_manager_);
 635
 636   status_container->SetLayoutManager(
 637       new internal::StatusAreaLayoutManager(this));
 638
 639   shelf_container->SetEventTargeter(scoped_ptr<ui::EventTargeter>(new
 640       ShelfWindowTargeter(shelf_container, shelf_layout_manager_)));
 641   status_container->SetEventTargeter(scoped_ptr<ui::EventTargeter>(new
 642       ShelfWindowTargeter(status_container, shelf_layout_manager_)));
 643
 644   views::Widget::AddObserver(this);
 645 }
 646
 647 ShelfWidget::~ShelfWidget() {
 648   RemoveObserver(this);
 649 }
 650
 651 void ShelfWidget::SetPaintsBackground(
 652     ShelfBackgroundType background_type,
 653     BackgroundAnimatorChangeType change_type) {
 654   ui::Layer* opaque_background = delegate_view_->opaque_background();
 655   float target_opacity =
 656       (background_type == SHELF_BACKGROUND_MAXIMIZED) ? 1.0f : 0.0f;
 657   scoped_ptr<ui::ScopedLayerAnimationSettings> opaque_background_animation;
 658   if (change_type != BACKGROUND_CHANGE_IMMEDIATE) {
 659     opaque_background_animation.reset(new ui::ScopedLayerAnimationSettings(
 660         opaque_background->GetAnimator()));
 661     opaque_background_animation->SetTransitionDuration(
 662         base::TimeDelta::FromMilliseconds(kTimeToSwitchBackgroundMs));
 663   }
 664   opaque_background->SetOpacity(target_opacity);
 665
 666   // TODO(mukai): use ui::Layer on both opaque_background and normal background
 667   // retire background_animator_ at all. It would be simpler.
 668   // See also DockedBackgroundWidget::SetPaintsBackground.
 669   background_animator_.SetPaintsBackground(
 670       background_type != SHELF_BACKGROUND_DEFAULT,
 671       change_type);
 672   delegate_view_->SchedulePaint();
 673 }
 674
 675 ShelfBackgroundType ShelfWidget::GetBackgroundType() const {
 676   if (delegate_view_->opaque_background()->GetTargetOpacity() == 1.0f)
 677     return SHELF_BACKGROUND_MAXIMIZED;
 678   if (background_animator_.paints_background())
 679     return SHELF_BACKGROUND_OVERLAP;
 680
 681   return SHELF_BACKGROUND_DEFAULT;
 682 }
 683
 684 // static
 685 bool ShelfWidget::ShelfAlignmentAllowed() {
 686   if (!ash::switches::ShowShelfAlignmentMenu())
 687     return false;
 688   user::LoginStatus login_status =
 689       Shell::GetInstance()->system_tray_delegate()->GetUserLoginStatus();
 690
 691   switch (login_status) {
 692     case user::LOGGED_IN_USER:
 693     case user::LOGGED_IN_OWNER:
 694       return true;
 695     case user::LOGGED_IN_LOCKED:
 696     case user::LOGGED_IN_PUBLIC:
 697     case user::LOGGED_IN_LOCALLY_MANAGED:
 698     case user::LOGGED_IN_GUEST:
 699     case user::LOGGED_IN_RETAIL_MODE:
 700     case user::LOGGED_IN_KIOSK_APP:
 701     case user::LOGGED_IN_NONE:
 702       return false;
 703   }
 704
 705   DCHECK(false);
 706   return false;
 707 }
 708
 709 ShelfAlignment ShelfWidget::GetAlignment() const {
 710   return shelf_layout_manager_->GetAlignment();
 711 }
 712
 713 void ShelfWidget::SetAlignment(ShelfAlignment alignment) {
 714   if (shelf_)
 715     shelf_->SetAlignment(alignment);
 716   status_area_widget_->SetShelfAlignment(alignment);
 717   delegate_view_->SchedulePaint();
 718 }
 719
 720 void ShelfWidget::SetDimsShelf(bool dimming) {
 721   delegate_view_->SetDimmed(dimming);
 722   // Repaint all children, allowing updates to reflect dimmed state eg:
 723   // status area background, app list button and overflow button.
 724   if (shelf_)
 725     shelf_->SchedulePaint();
 726   status_area_widget_->GetContentsView()->SchedulePaint();
 727 }
 728
 729 bool ShelfWidget::GetDimsShelf() const {
 730   return delegate_view_->GetDimmed();
 731 }
 732
 733 void ShelfWidget::CreateShelf() {
 734   if (shelf_)
 735     return;
 736
 737   Shell* shell = Shell::GetInstance();
 738   // This needs to be called before shelf_model().
 739   ShelfDelegate* shelf_delegate = shell->GetShelfDelegate();
 740   if (!shelf_delegate)
 741     return;  // Not ready to create Shelf.
 742
 743   shelf_.reset(
 744       new Shelf(shell->shelf_model(), shell->GetShelfDelegate(), this));
 745   SetFocusCycler(shell->focus_cycler());
 746
 747   // Inform the root window controller.
 748   internal::RootWindowController::ForWindow(window_container_)
 749       ->OnShelfCreated();
 750
 751   shelf_->SetVisible(
 752       shell->session_state_delegate()->IsActiveUserSessionStarted());
 753   shelf_layout_manager_->LayoutShelf();
 754   Show();
 755 }
 756
 757 bool ShelfWidget::IsShelfVisible() const {
 758   return shelf_.get() && shelf_->IsVisible();
 759 }
 760
 761 void ShelfWidget::SetShelfVisibility(bool visible) {
 762   if (shelf_)
 763     shelf_->SetVisible(visible);
 764 }
 765
 766 void ShelfWidget::SetFocusCycler(internal::FocusCycler* focus_cycler) {
 767   delegate_view_->set_focus_cycler(focus_cycler);
 768   if (focus_cycler)
 769     focus_cycler->AddWidget(this);
 770 }
 771
 772 internal::FocusCycler* ShelfWidget::GetFocusCycler() {
 773   return delegate_view_->focus_cycler();
 774 }
 775
 776 void ShelfWidget::ShutdownStatusAreaWidget() {
 777   if (status_area_widget_)
 778     status_area_widget_->Shutdown();
 779   status_area_widget_ = NULL;
 780 }
 781
 782 void ShelfWidget::ForceUndimming(bool force) {
 783   delegate_view_->ForceUndimming(force);
 784 }
 785
 786 void ShelfWidget::OnWidgetActivationChanged(views::Widget* widget,
 787                                             bool active) {
 788   activating_as_fallback_ = false;
 789   if (active)
 790     delegate_view_->SetPaneFocusAndFocusDefault();
 791   else
 792     delegate_view_->GetFocusManager()->ClearFocus();
 793 }
 794
 795 int ShelfWidget::GetDimmingAlphaForTest() {
 796   if (delegate_view_)
 797     return delegate_view_->GetDimmingAlphaForTest();
 798   return -1;
 799 }
 800
 801 gfx::Rect ShelfWidget::GetDimmerBoundsForTest() {
 802   if (delegate_view_)
 803     return delegate_view_->GetDimmerBoundsForTest();
 804   return gfx::Rect();
 805 }
 806
 807 void ShelfWidget::DisableDimmingAnimationsForTest() {
 808   DCHECK(delegate_view_);
 809   return delegate_view_->disable_dimming_animations_for_test();
 810 }
 811
 812 void ShelfWidget::WillDeleteShelf() {
 813   shelf_layout_manager_->RemoveObserver(this);
 814   shelf_layout_manager_ = NULL;
 815 }
 816
 817 }  // namespace ash