ash/shelf/shelf_widget.cc

   1 // Copyright 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/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/window.h"
  26 #include "ui/aura/window_event_dispatcher.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 #include "ui/wm/core/coordinate_conversion.h"
  40 #include "ui/wm/core/easy_resize_window_targeter.h"
  41 #include "ui/wm/public/activation_client.h"
  42
  43 namespace {
  44 // Size of black border at bottom (or side) of shelf.
  45 const int kNumBlackPixels = 3;
  46 // Alpha to paint dimming image with.
  47 const int kDimAlpha = 128;
  48
  49 // The time to dim and un-dim.
  50 const int kTimeToDimMs = 3000;  // Slow in dimming.
  51 const int kTimeToUnDimMs = 200;  // Fast in activating.
  52
  53 // Class used to slightly dim shelf items when maximized and visible.
  54 class DimmerView : public views::View,
  55                    public views::WidgetDelegate,
  56                    ash::BackgroundAnimatorDelegate {
  57  public:
  58   // If |disable_dimming_animations_for_test| is set, all alpha animations will
  59   // be performed instantly.
  60   DimmerView(ash::ShelfWidget* shelf_widget,
  61              bool disable_dimming_animations_for_test);
  62   ~DimmerView() override;
  63
  64   // Called by |DimmerEventFilter| when the mouse |hovered| state changes.
  65   void SetHovered(bool hovered);
  66
  67   // Force the dimmer to be undimmed.
  68   void ForceUndimming(bool force);
  69
  70   // views::WidgetDelegate overrides:
  71   views::Widget* GetWidget() override { return View::GetWidget(); }
  72   const views::Widget* GetWidget() const override { return View::GetWidget(); }
  73
  74   // ash::BackgroundAnimatorDelegate overrides:
  75   void UpdateBackground(int alpha) override {
  76     alpha_ = alpha;
  77     SchedulePaint();
  78   }
  79
  80   // views::View overrides:
  81   void OnPaintBackground(gfx::Canvas* canvas) override;
  82
  83   // A function to test the current alpha used.
  84   int get_dimming_alpha_for_test() { return alpha_; }
  85
  86  private:
  87   // This class monitors mouse events to see if it is on top of the shelf.
  88   class DimmerEventFilter : public ui::EventHandler {
  89    public:
  90     explicit DimmerEventFilter(DimmerView* owner);
  91     ~DimmerEventFilter() override;
  92
  93     // Overridden from ui::EventHandler:
  94     void OnMouseEvent(ui::MouseEvent* event) override;
  95     void OnTouchEvent(ui::TouchEvent* event) override;
  96
  97    private:
  98     // The owning class.
  99     DimmerView* owner_;
 100
 101     // TRUE if the mouse is inside the shelf.
 102     bool mouse_inside_;
 103
 104     // TRUE if a touch event is inside the shelf.
 105     bool touch_inside_;
 106
 107     DISALLOW_COPY_AND_ASSIGN(DimmerEventFilter);
 108   };
 109
 110   // The owning shelf.
 111   ash::ShelfWidget* shelf_;
 112
 113   // The alpha to use for covering the shelf.
 114   int alpha_;
 115
 116   // True if the event filter claims that we should not be dimmed.
 117   bool is_hovered_;
 118
 119   // True if someone forces us not to be dimmed (e.g. a menu is open).
 120   bool force_hovered_;
 121
 122   // True if animations should be suppressed for a test.
 123   bool disable_dimming_animations_for_test_;
 124
 125   // The animator for the background transitions.
 126   ash::BackgroundAnimator background_animator_;
 127
 128   // Notification of entering / exiting of the shelf area by mouse.
 129   scoped_ptr<DimmerEventFilter> event_filter_;
 130
 131   DISALLOW_COPY_AND_ASSIGN(DimmerView);
 132 };
 133
 134 DimmerView::DimmerView(ash::ShelfWidget* shelf_widget,
 135                        bool disable_dimming_animations_for_test)
 136     : shelf_(shelf_widget),
 137       alpha_(kDimAlpha),
 138       is_hovered_(false),
 139       force_hovered_(false),
 140       disable_dimming_animations_for_test_(disable_dimming_animations_for_test),
 141       background_animator_(this, 0, kDimAlpha) {
 142   event_filter_.reset(new DimmerEventFilter(this));
 143   // Make sure it is undimmed at the beginning and then fire off the dimming
 144   // animation.
 145   background_animator_.SetPaintsBackground(false,
 146                                            ash::BACKGROUND_CHANGE_IMMEDIATE);
 147   SetHovered(false);
 148 }
 149
 150 DimmerView::~DimmerView() {
 151 }
 152
 153 void DimmerView::SetHovered(bool hovered) {
 154   // Remember the hovered state so that we can correct the state once a
 155   // possible force state has disappeared.
 156   is_hovered_ = hovered;
 157   // Undimm also if we were forced to by e.g. an open menu.
 158   hovered |= force_hovered_;
 159   background_animator_.SetDuration(hovered ? kTimeToUnDimMs : kTimeToDimMs);
 160   background_animator_.SetPaintsBackground(!hovered,
 161       disable_dimming_animations_for_test_ ?
 162           ash::BACKGROUND_CHANGE_IMMEDIATE : ash::BACKGROUND_CHANGE_ANIMATE);
 163 }
 164
 165 void DimmerView::ForceUndimming(bool force) {
 166   bool previous = force_hovered_;
 167   force_hovered_ = force;
 168   // If the forced change does change the result we apply the change.
 169   if (is_hovered_ || force_hovered_ != is_hovered_ || previous)
 170     SetHovered(is_hovered_);
 171 }
 172
 173 void DimmerView::OnPaintBackground(gfx::Canvas* canvas) {
 174   SkPaint paint;
 175   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 176   gfx::ImageSkia shelf_background =
 177       *rb.GetImageNamed(IDR_ASH_SHELF_DIMMING).ToImageSkia();
 178
 179   if (shelf_->GetAlignment() != ash::SHELF_ALIGNMENT_BOTTOM) {
 180     shelf_background = gfx::ImageSkiaOperations::CreateRotatedImage(
 181         shelf_background,
 182         shelf_->shelf_layout_manager()->SelectValueForShelfAlignment(
 183             SkBitmapOperations::ROTATION_90_CW,
 184             SkBitmapOperations::ROTATION_90_CW,
 185             SkBitmapOperations::ROTATION_270_CW,
 186             SkBitmapOperations::ROTATION_180_CW));
 187   }
 188   paint.setAlpha(alpha_);
 189   canvas->DrawImageInt(shelf_background,
 190                        0,
 191                        0,
 192                        shelf_background.width(),
 193                        shelf_background.height(),
 194                        0,
 195                        0,
 196                        width(),
 197                        height(),
 198                        false,
 199                        paint);
 200 }
 201
 202 DimmerView::DimmerEventFilter::DimmerEventFilter(DimmerView* owner)
 203     : owner_(owner),
 204       mouse_inside_(false),
 205       touch_inside_(false) {
 206   ash::Shell::GetInstance()->AddPreTargetHandler(this);
 207 }
 208
 209 DimmerView::DimmerEventFilter::~DimmerEventFilter() {
 210   ash::Shell::GetInstance()->RemovePreTargetHandler(this);
 211 }
 212
 213 void DimmerView::DimmerEventFilter::OnMouseEvent(ui::MouseEvent* event) {
 214   if (event->type() != ui::ET_MOUSE_MOVED &&
 215       event->type() != ui::ET_MOUSE_DRAGGED)
 216     return;
 217
 218   gfx::Point screen_point(event->location());
 219   ::wm::ConvertPointToScreen(static_cast<aura::Window*>(event->target()),
 220                              &screen_point);
 221   bool inside = owner_->GetBoundsInScreen().Contains(screen_point);
 222   if (mouse_inside_ || touch_inside_ != inside || touch_inside_)
 223     owner_->SetHovered(inside || touch_inside_);
 224   mouse_inside_ = inside;
 225 }
 226
 227 void DimmerView::DimmerEventFilter::OnTouchEvent(ui::TouchEvent* event) {
 228   bool touch_inside = false;
 229   if (event->type() != ui::ET_TOUCH_RELEASED &&
 230       event->type() != ui::ET_TOUCH_CANCELLED) {
 231     gfx::Point screen_point(event->location());
 232     ::wm::ConvertPointToScreen(static_cast<aura::Window*>(event->target()),
 233                                &screen_point);
 234     touch_inside = owner_->GetBoundsInScreen().Contains(screen_point);
 235   }
 236
 237   if (mouse_inside_ || touch_inside_ != mouse_inside_ || touch_inside)
 238     owner_->SetHovered(mouse_inside_ || touch_inside);
 239   touch_inside_ = touch_inside;
 240 }
 241
 242 using ash::ShelfLayoutManager;
 243
 244 // ShelfWindowTargeter makes it easier to resize windows with the mouse when the
 245 // window-edge slightly overlaps with the shelf edge. The targeter also makes it
 246 // easier to drag the shelf out with touch while it is hidden.
 247 class ShelfWindowTargeter : public wm::EasyResizeWindowTargeter,
 248                             public ash::ShelfLayoutManagerObserver {
 249  public:
 250   ShelfWindowTargeter(aura::Window* container,
 251                       ShelfLayoutManager* shelf)
 252       : wm::EasyResizeWindowTargeter(container, gfx::Insets(), gfx::Insets()),
 253         shelf_(shelf) {
 254     WillChangeVisibilityState(shelf_->visibility_state());
 255     shelf_->AddObserver(this);
 256   }
 257
 258   ~ShelfWindowTargeter() override {
 259     // |shelf_| may have been destroyed by this time.
 260     if (shelf_)
 261       shelf_->RemoveObserver(this);
 262   }
 263
 264  private:
 265   gfx::Insets GetInsetsForAlignment(int distance,
 266                                     ash::ShelfAlignment alignment) {
 267     switch (alignment) {
 268       case ash::SHELF_ALIGNMENT_BOTTOM:
 269         return gfx::Insets(distance, 0, 0, 0);
 270       case ash::SHELF_ALIGNMENT_LEFT:
 271         return gfx::Insets(0, 0, 0, distance);
 272       case ash::SHELF_ALIGNMENT_RIGHT:
 273         return gfx::Insets(0, distance, 0, 0);
 274       case ash::SHELF_ALIGNMENT_TOP:
 275         return gfx::Insets(0, 0, distance, 0);
 276     }
 277     NOTREACHED();
 278     return gfx::Insets();
 279   }
 280
 281   // ash::ShelfLayoutManagerObserver:
 282   void WillDeleteShelf() override { shelf_ = NULL; }
 283
 284   void WillChangeVisibilityState(ash::ShelfVisibilityState new_state) override {
 285     gfx::Insets mouse_insets;
 286     gfx::Insets touch_insets;
 287     if (new_state == ash::SHELF_VISIBLE) {
 288       // Let clicks at the very top of the shelf through so windows can be
 289       // resized with the bottom-right corner and bottom edge.
 290       mouse_insets = GetInsetsForAlignment(
 291           ShelfLayoutManager::kWorkspaceAreaVisibleInset,
 292           shelf_->GetAlignment());
 293     } else if (new_state == ash::SHELF_AUTO_HIDE) {
 294       // Extend the touch hit target out a bit to allow users to drag shelf out
 295       // while hidden.
 296       touch_insets = GetInsetsForAlignment(
 297           -ShelfLayoutManager::kWorkspaceAreaAutoHideInset,
 298           shelf_->GetAlignment());
 299     }
 300
 301     set_mouse_extend(mouse_insets);
 302     set_touch_extend(touch_insets);
 303   }
 304
 305   ShelfLayoutManager* shelf_;
 306
 307   DISALLOW_COPY_AND_ASSIGN(ShelfWindowTargeter);
 308 };
 309
 310 }  // namespace
 311
 312 namespace ash {
 313
 314 // The contents view of the Shelf. This view contains ShelfView and
 315 // sizes it to the width of the shelf minus the size of the status area.
 316 class ShelfWidget::DelegateView : public views::WidgetDelegate,
 317                                   public views::AccessiblePaneView,
 318                                   public BackgroundAnimatorDelegate,
 319                                   public aura::WindowObserver {
 320  public:
 321   explicit DelegateView(ShelfWidget* shelf);
 322   ~DelegateView() override;
 323
 324   void set_focus_cycler(FocusCycler* focus_cycler) {
 325     focus_cycler_ = focus_cycler;
 326   }
 327   FocusCycler* focus_cycler() { return focus_cycler_; }
 328
 329   ui::Layer* opaque_background() { return &opaque_background_; }
 330   ui::Layer* opaque_foreground() { return &opaque_foreground_; }
 331
 332   // Set if the shelf area is dimmed (eg when a window is maximized).
 333   void SetDimmed(bool dimmed);
 334   bool GetDimmed() const;
 335
 336   void SetParentLayer(ui::Layer* layer);
 337
 338   // views::View overrides:
 339   void OnPaintBackground(gfx::Canvas* canvas) override;
 340
 341   // views::WidgetDelegateView overrides:
 342   views::Widget* GetWidget() override { return View::GetWidget(); }
 343   const views::Widget* GetWidget() const override { return View::GetWidget(); }
 344
 345   bool CanActivate() const override;
 346   void Layout() override;
 347   void ReorderChildLayers(ui::Layer* parent_layer) override;
 348   // This will be called when the parent local bounds change.
 349   void OnBoundsChanged(const gfx::Rect& old_bounds) override;
 350
 351   // aura::WindowObserver overrides:
 352   // This will be called when the shelf itself changes its absolute position.
 353   // Since the |dimmer_| panel needs to be placed in screen coordinates it needs
 354   // to be repositioned. The difference to the OnBoundsChanged call above is
 355   // that this gets also triggered when the shelf only moves.
 356   void OnWindowBoundsChanged(aura::Window* window,
 357                              const gfx::Rect& old_bounds,
 358                              const gfx::Rect& new_bounds) override;
 359
 360   // BackgroundAnimatorDelegate overrides:
 361   void UpdateBackground(int alpha) override;
 362
 363   // Force the shelf to be presented in an undimmed state.
 364   void ForceUndimming(bool force);
 365
 366   // A function to test the current alpha used by the dimming bar. If there is
 367   // no dimmer active, the function will return -1.
 368   int GetDimmingAlphaForTest();
 369
 370   // A function to test the bounds of the dimming bar. Returns gfx::Rect() if
 371   // the dimmer is inactive.
 372   gfx::Rect GetDimmerBoundsForTest();
 373
 374   // Disable dimming animations for running tests. This needs to be called
 375   // prior to the creation of of the |dimmer_|.
 376   void disable_dimming_animations_for_test() {
 377     disable_dimming_animations_for_test_ = true;
 378   }
 379
 380  private:
 381   ShelfWidget* shelf_;
 382   scoped_ptr<views::Widget> dimmer_;
 383   FocusCycler* focus_cycler_;
 384   int alpha_;
 385   // A black background layer which is shown when a maximized window is visible.
 386   ui::Layer opaque_background_;
 387   // A black foreground layer which is shown while transitioning between users.
 388   // Note: Since the back- and foreground layers have different functions they
 389   // can be used simultaneously - so no repurposing possible.
 390   ui::Layer opaque_foreground_;
 391
 392   // The view which does the dimming.
 393   DimmerView* dimmer_view_;
 394
 395   // True if dimming animations should be turned off.
 396   bool disable_dimming_animations_for_test_;
 397
 398   DISALLOW_COPY_AND_ASSIGN(DelegateView);
 399 };
 400
 401 ShelfWidget::DelegateView::DelegateView(ShelfWidget* shelf)
 402     : shelf_(shelf),
 403       focus_cycler_(NULL),
 404       alpha_(0),
 405       opaque_background_(ui::LAYER_SOLID_COLOR),
 406       opaque_foreground_(ui::LAYER_SOLID_COLOR),
 407       dimmer_view_(NULL),
 408       disable_dimming_animations_for_test_(false) {
 409   set_allow_deactivate_on_esc(true);
 410   opaque_background_.SetColor(SK_ColorBLACK);
 411   opaque_background_.SetBounds(GetLocalBounds());
 412   opaque_background_.SetOpacity(0.0f);
 413   opaque_foreground_.SetColor(SK_ColorBLACK);
 414   opaque_foreground_.SetBounds(GetLocalBounds());
 415   opaque_foreground_.SetOpacity(0.0f);
 416 }
 417
 418 ShelfWidget::DelegateView::~DelegateView() {
 419   // Make sure that the dimmer goes away since it might have set an observer.
 420   SetDimmed(false);
 421 }
 422
 423 void ShelfWidget::DelegateView::SetDimmed(bool value) {
 424   if (value == (dimmer_.get() != NULL))
 425     return;
 426
 427   if (value) {
 428     dimmer_.reset(new views::Widget);
 429     views::Widget::InitParams params(
 430         views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
 431     params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
 432     params.activatable = views::Widget::InitParams::ACTIVATABLE_NO;
 433     params.accept_events = false;
 434     params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
 435     params.parent = shelf_->GetNativeView();
 436     dimmer_->Init(params);
 437     dimmer_->GetNativeWindow()->SetName("ShelfDimmer");
 438     dimmer_->SetBounds(shelf_->GetWindowBoundsInScreen());
 439     // The shelf should not take focus when it is initially shown.
 440     dimmer_->set_focus_on_creation(false);
 441     dimmer_view_ = new DimmerView(shelf_, disable_dimming_animations_for_test_);
 442     dimmer_->SetContentsView(dimmer_view_);
 443     dimmer_->GetNativeView()->SetName("ShelfDimmerView");
 444     dimmer_->Show();
 445     shelf_->GetNativeView()->AddObserver(this);
 446   } else {
 447     // Some unit tests will come here with a destroyed window.
 448     if (shelf_->GetNativeView())
 449       shelf_->GetNativeView()->RemoveObserver(this);
 450     dimmer_view_ = NULL;
 451     dimmer_.reset(NULL);
 452   }
 453 }
 454
 455 bool ShelfWidget::DelegateView::GetDimmed() const {
 456   return dimmer_.get() && dimmer_->IsVisible();
 457 }
 458
 459 void ShelfWidget::DelegateView::SetParentLayer(ui::Layer* layer) {
 460   layer->Add(&opaque_background_);
 461   layer->Add(&opaque_foreground_);
 462   ReorderLayers();
 463 }
 464
 465 void ShelfWidget::DelegateView::OnPaintBackground(gfx::Canvas* canvas) {
 466   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 467   gfx::ImageSkia shelf_background =
 468       *rb.GetImageSkiaNamed(IDR_ASH_SHELF_BACKGROUND);
 469   if (SHELF_ALIGNMENT_BOTTOM != shelf_->GetAlignment())
 470     shelf_background = gfx::ImageSkiaOperations::CreateRotatedImage(
 471         shelf_background,
 472         shelf_->shelf_layout_manager()->SelectValueForShelfAlignment(
 473             SkBitmapOperations::ROTATION_90_CW,
 474             SkBitmapOperations::ROTATION_90_CW,
 475             SkBitmapOperations::ROTATION_270_CW,
 476             SkBitmapOperations::ROTATION_180_CW));
 477   const gfx::Rect dock_bounds(shelf_->shelf_layout_manager()->dock_bounds());
 478   SkPaint paint;
 479   paint.setAlpha(alpha_);
 480   canvas->DrawImageInt(shelf_background,
 481                        0,
 482                        0,
 483                        shelf_background.width(),
 484                        shelf_background.height(),
 485                        (SHELF_ALIGNMENT_BOTTOM == shelf_->GetAlignment() &&
 486                         dock_bounds.x() == 0 && dock_bounds.width() > 0)
 487                            ? dock_bounds.width()
 488                            : 0,
 489                        0,
 490                        SHELF_ALIGNMENT_BOTTOM == shelf_->GetAlignment()
 491                            ? width() - dock_bounds.width()
 492                            : width(),
 493                        height(),
 494                        false,
 495                        paint);
 496   if (SHELF_ALIGNMENT_BOTTOM == shelf_->GetAlignment() &&
 497       dock_bounds.width() > 0) {
 498     // The part of the shelf background that is in the corner below the docked
 499     // windows close to the work area is an arched gradient that blends
 500     // vertically oriented docked background and horizontal shelf.
 501     gfx::ImageSkia shelf_corner = *rb.GetImageSkiaNamed(IDR_ASH_SHELF_CORNER);
 502     if (dock_bounds.x() == 0) {
 503       shelf_corner = gfx::ImageSkiaOperations::CreateRotatedImage(
 504           shelf_corner, SkBitmapOperations::ROTATION_90_CW);
 505     }
 506     canvas->DrawImageInt(
 507         shelf_corner,
 508         0,
 509         0,
 510         shelf_corner.width(),
 511         shelf_corner.height(),
 512         dock_bounds.x() > 0 ? dock_bounds.x() : dock_bounds.width() - height(),
 513         0,
 514         height(),
 515         height(),
 516         false,
 517         paint);
 518     // The part of the shelf background that is just below the docked windows
 519     // is drawn using the last (lowest) 1-pixel tall strip of the image asset.
 520     // This avoids showing the border 3D shadow between the shelf and the dock.
 521     canvas->DrawImageInt(shelf_background,
 522                          0,
 523                          shelf_background.height() - 1,
 524                          shelf_background.width(),
 525                          1,
 526                          dock_bounds.x() > 0 ? dock_bounds.x() + height() : 0,
 527                          0,
 528                          dock_bounds.width() - height(),
 529                          height(),
 530                          false,
 531                          paint);
 532   }
 533   gfx::Rect black_rect =
 534       shelf_->shelf_layout_manager()->SelectValueForShelfAlignment(
 535           gfx::Rect(0, height() - kNumBlackPixels, width(), kNumBlackPixels),
 536           gfx::Rect(0, 0, kNumBlackPixels, height()),
 537           gfx::Rect(width() - kNumBlackPixels, 0, kNumBlackPixels, height()),
 538           gfx::Rect(0, 0, width(), kNumBlackPixels));
 539   canvas->FillRect(black_rect, SK_ColorBLACK);
 540 }
 541
 542 bool ShelfWidget::DelegateView::CanActivate() const {
 543   // Allow to activate as fallback.
 544   if (shelf_->activating_as_fallback_)
 545     return true;
 546   // Allow to activate from the focus cycler.
 547   if (focus_cycler_ && focus_cycler_->widget_activating() == GetWidget())
 548     return true;
 549   // Disallow activating in other cases, especially when using mouse.
 550   return false;
 551 }
 552
 553 void ShelfWidget::DelegateView::Layout() {
 554   for(int i = 0; i < child_count(); ++i) {
 555     if (shelf_->shelf_layout_manager()->IsHorizontalAlignment()) {
 556       child_at(i)->SetBounds(child_at(i)->x(), child_at(i)->y(),
 557                              child_at(i)->width(), height());
 558     } else {
 559       child_at(i)->SetBounds(child_at(i)->x(), child_at(i)->y(),
 560                              width(), child_at(i)->height());
 561     }
 562   }
 563 }
 564
 565 void ShelfWidget::DelegateView::ReorderChildLayers(ui::Layer* parent_layer) {
 566   views::View::ReorderChildLayers(parent_layer);
 567   parent_layer->StackAtBottom(&opaque_background_);
 568   parent_layer->StackAtTop(&opaque_foreground_);
 569 }
 570
 571 void ShelfWidget::DelegateView::OnBoundsChanged(const gfx::Rect& old_bounds) {
 572   opaque_background_.SetBounds(GetLocalBounds());
 573   opaque_foreground_.SetBounds(GetLocalBounds());
 574   if (dimmer_)
 575     dimmer_->SetBounds(GetBoundsInScreen());
 576 }
 577
 578 void ShelfWidget::DelegateView::OnWindowBoundsChanged(
 579     aura::Window* window,
 580     const gfx::Rect& old_bounds,
 581     const gfx::Rect& new_bounds) {
 582   // Coming here the shelf got repositioned and since the |dimmer_| is placed
 583   // in screen coordinates and not relative to the parent it needs to be
 584   // repositioned accordingly.
 585   dimmer_->SetBounds(GetBoundsInScreen());
 586 }
 587
 588 void ShelfWidget::DelegateView::ForceUndimming(bool force) {
 589   if (GetDimmed())
 590     dimmer_view_->ForceUndimming(force);
 591 }
 592
 593 int ShelfWidget::DelegateView::GetDimmingAlphaForTest() {
 594   if (GetDimmed())
 595     return dimmer_view_->get_dimming_alpha_for_test();
 596   return -1;
 597 }
 598
 599 gfx::Rect ShelfWidget::DelegateView::GetDimmerBoundsForTest() {
 600   if (GetDimmed())
 601     return dimmer_view_->GetBoundsInScreen();
 602   return gfx::Rect();
 603 }
 604
 605 void ShelfWidget::DelegateView::UpdateBackground(int alpha) {
 606   alpha_ = alpha;
 607   SchedulePaint();
 608 }
 609
 610 ShelfWidget::ShelfWidget(aura::Window* shelf_container,
 611                          aura::Window* status_container,
 612                          WorkspaceController* workspace_controller)
 613     : delegate_view_(new DelegateView(this)),
 614       background_animator_(delegate_view_, 0, kShelfBackgroundAlpha),
 615       activating_as_fallback_(false),
 616       window_container_(shelf_container) {
 617   views::Widget::InitParams params(
 618       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
 619   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
 620   params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
 621   params.parent = shelf_container;
 622   params.delegate = delegate_view_;
 623   Init(params);
 624
 625   // The shelf should not take focus when initially shown.
 626   set_focus_on_creation(false);
 627   SetContentsView(delegate_view_);
 628   delegate_view_->SetParentLayer(GetLayer());
 629
 630   status_area_widget_ = new StatusAreaWidget(status_container);
 631   status_area_widget_->CreateTrayViews();
 632   if (Shell::GetInstance()->session_state_delegate()->
 633           IsActiveUserSessionStarted()) {
 634     status_area_widget_->Show();
 635   }
 636   Shell::GetInstance()->focus_cycler()->AddWidget(status_area_widget_);
 637
 638   shelf_layout_manager_ = new ShelfLayoutManager(this);
 639   shelf_layout_manager_->AddObserver(this);
 640   shelf_container->SetLayoutManager(shelf_layout_manager_);
 641   shelf_layout_manager_->set_workspace_controller(workspace_controller);
 642   workspace_controller->SetShelf(shelf_layout_manager_);
 643
 644   status_container->SetLayoutManager(
 645       new StatusAreaLayoutManager(status_container, this));
 646
 647   shelf_container->SetEventTargeter(scoped_ptr<ui::EventTargeter>(new
 648       ShelfWindowTargeter(shelf_container, shelf_layout_manager_)));
 649   status_container->SetEventTargeter(scoped_ptr<ui::EventTargeter>(new
 650       ShelfWindowTargeter(status_container, shelf_layout_manager_)));
 651
 652   views::Widget::AddObserver(this);
 653 }
 654
 655 ShelfWidget::~ShelfWidget() {
 656   RemoveObserver(this);
 657 }
 658
 659 void ShelfWidget::SetPaintsBackground(
 660     ShelfBackgroundType background_type,
 661     BackgroundAnimatorChangeType change_type) {
 662   ui::Layer* opaque_background = delegate_view_->opaque_background();
 663   float target_opacity =
 664       (background_type == SHELF_BACKGROUND_MAXIMIZED) ? 1.0f : 0.0f;
 665   scoped_ptr<ui::ScopedLayerAnimationSettings> opaque_background_animation;
 666   if (change_type != BACKGROUND_CHANGE_IMMEDIATE) {
 667     opaque_background_animation.reset(new ui::ScopedLayerAnimationSettings(
 668         opaque_background->GetAnimator()));
 669     opaque_background_animation->SetTransitionDuration(
 670         base::TimeDelta::FromMilliseconds(kTimeToSwitchBackgroundMs));
 671   }
 672   opaque_background->SetOpacity(target_opacity);
 673
 674   // TODO(mukai): use ui::Layer on both opaque_background and normal background
 675   // retire background_animator_ at all. It would be simpler.
 676   // See also DockedBackgroundWidget::SetPaintsBackground.
 677   background_animator_.SetPaintsBackground(
 678       background_type != SHELF_BACKGROUND_DEFAULT,
 679       change_type);
 680   delegate_view_->SchedulePaint();
 681 }
 682
 683 ShelfBackgroundType ShelfWidget::GetBackgroundType() const {
 684   if (delegate_view_->opaque_background()->GetTargetOpacity() == 1.0f)
 685     return SHELF_BACKGROUND_MAXIMIZED;
 686   if (background_animator_.paints_background())
 687     return SHELF_BACKGROUND_OVERLAP;
 688
 689   return SHELF_BACKGROUND_DEFAULT;
 690 }
 691
 692 void ShelfWidget::HideShelfBehindBlackBar(bool hide, int animation_time_ms) {
 693   if (IsShelfHiddenBehindBlackBar() == hide)
 694     return;
 695
 696   ui::Layer* opaque_foreground = delegate_view_->opaque_foreground();
 697   float target_opacity = hide ? 1.0f : 0.0f;
 698   scoped_ptr<ui::ScopedLayerAnimationSettings> opaque_foreground_animation;
 699   opaque_foreground_animation.reset(new ui::ScopedLayerAnimationSettings(
 700       opaque_foreground->GetAnimator()));
 701   opaque_foreground_animation->SetTransitionDuration(
 702       base::TimeDelta::FromMilliseconds(animation_time_ms));
 703   opaque_foreground_animation->SetPreemptionStrategy(
 704       ui::LayerAnimator::REPLACE_QUEUED_ANIMATIONS);
 705
 706   opaque_foreground->SetOpacity(target_opacity);
 707 }
 708
 709 bool ShelfWidget::IsShelfHiddenBehindBlackBar() const {
 710   return delegate_view_->opaque_foreground()->GetTargetOpacity() != 0.0f;
 711 }
 712
 713 // static
 714 bool ShelfWidget::ShelfAlignmentAllowed() {
 715   if (Shell::GetInstance()->system_tray_delegate()->IsUserSupervised())
 716     return false;
 717
 718   user::LoginStatus login_status =
 719       Shell::GetInstance()->system_tray_delegate()->GetUserLoginStatus();
 720
 721   switch (login_status) {
 722     case user::LOGGED_IN_LOCKED:
 723       // Shelf alignment changes can be requested while being locked, but will
 724       // be applied upon unlock.
 725     case user::LOGGED_IN_USER:
 726     case user::LOGGED_IN_OWNER:
 727       return true;
 728     case user::LOGGED_IN_PUBLIC:
 729     case user::LOGGED_IN_SUPERVISED:
 730     case user::LOGGED_IN_GUEST:
 731     case user::LOGGED_IN_KIOSK_APP:
 732     case user::LOGGED_IN_NONE:
 733       return false;
 734   }
 735
 736   DCHECK(false);
 737   return false;
 738 }
 739
 740 ShelfAlignment ShelfWidget::GetAlignment() const {
 741   return shelf_layout_manager_->GetAlignment();
 742 }
 743
 744 void ShelfWidget::SetAlignment(ShelfAlignment alignment) {
 745   if (shelf_)
 746     shelf_->SetAlignment(alignment);
 747   status_area_widget_->SetShelfAlignment(alignment);
 748   delegate_view_->SchedulePaint();
 749 }
 750
 751 void ShelfWidget::SetDimsShelf(bool dimming) {
 752   delegate_view_->SetDimmed(dimming);
 753   // Repaint all children, allowing updates to reflect dimmed state eg:
 754   // status area background, app list button and overflow button.
 755   if (shelf_)
 756     shelf_->SchedulePaint();
 757   status_area_widget_->SchedulePaint();
 758 }
 759
 760 bool ShelfWidget::GetDimsShelf() const {
 761   return delegate_view_->GetDimmed();
 762 }
 763
 764 void ShelfWidget::CreateShelf() {
 765   if (shelf_)
 766     return;
 767
 768   Shell* shell = Shell::GetInstance();
 769   // This needs to be called before shelf_model().
 770   ShelfDelegate* shelf_delegate = shell->GetShelfDelegate();
 771   if (!shelf_delegate)
 772     return;  // Not ready to create Shelf.
 773
 774   shelf_.reset(
 775       new Shelf(shell->shelf_model(), shell->GetShelfDelegate(), this));
 776   SetFocusCycler(shell->focus_cycler());
 777
 778   // Inform the root window controller.
 779   RootWindowController::ForWindow(window_container_)->OnShelfCreated();
 780
 781   shelf_->SetVisible(
 782       shell->session_state_delegate()->IsActiveUserSessionStarted());
 783   shelf_layout_manager_->LayoutShelf();
 784   Show();
 785 }
 786
 787 bool ShelfWidget::IsShelfVisible() const {
 788   return shelf_.get() && shelf_->IsVisible();
 789 }
 790
 791 void ShelfWidget::SetShelfVisibility(bool visible) {
 792   if (shelf_)
 793     shelf_->SetVisible(visible);
 794 }
 795
 796 void ShelfWidget::SetFocusCycler(FocusCycler* focus_cycler) {
 797   delegate_view_->set_focus_cycler(focus_cycler);
 798   if (focus_cycler)
 799     focus_cycler->AddWidget(this);
 800 }
 801
 802 FocusCycler* ShelfWidget::GetFocusCycler() {
 803   return delegate_view_->focus_cycler();
 804 }
 805
 806 void ShelfWidget::ShutdownStatusAreaWidget() {
 807   if (status_area_widget_)
 808     status_area_widget_->Shutdown();
 809   status_area_widget_ = NULL;
 810 }
 811
 812 void ShelfWidget::ForceUndimming(bool force) {
 813   delegate_view_->ForceUndimming(force);
 814 }
 815
 816 void ShelfWidget::OnWidgetActivationChanged(views::Widget* widget,
 817                                             bool active) {
 818   activating_as_fallback_ = false;
 819   if (active)
 820     delegate_view_->SetPaneFocusAndFocusDefault();
 821   else
 822     delegate_view_->GetFocusManager()->ClearFocus();
 823 }
 824
 825 int ShelfWidget::GetDimmingAlphaForTest() {
 826   if (delegate_view_)
 827     return delegate_view_->GetDimmingAlphaForTest();
 828   return -1;
 829 }
 830
 831 gfx::Rect ShelfWidget::GetDimmerBoundsForTest() {
 832   if (delegate_view_)
 833     return delegate_view_->GetDimmerBoundsForTest();
 834   return gfx::Rect();
 835 }
 836
 837 void ShelfWidget::DisableDimmingAnimationsForTest() {
 838   DCHECK(delegate_view_);
 839   return delegate_view_->disable_dimming_animations_for_test();
 840 }
 841
 842 void ShelfWidget::WillDeleteShelf() {
 843   shelf_layout_manager_->RemoveObserver(this);
 844   shelf_layout_manager_ = NULL;
 845 }
 846
 847 }  // namespace ash