src/ash/shelf/shelf_layout_manager.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_layout_manager.h"
   6
   7 #include <algorithm>
   8 #include <cmath>
   9 #include <cstring>
  10 #include <string>
  11 #include <vector>
  12
  13 #include "ash/ash_switches.h"
  14 #include "ash/launcher/launcher.h"
  15 #include "ash/launcher/launcher_types.h"
  16 #include "ash/root_window_controller.h"
  17 #include "ash/screen_ash.h"
  18 #include "ash/session_state_delegate.h"
  19 #include "ash/shelf/shelf_bezel_event_filter.h"
  20 #include "ash/shelf/shelf_layout_manager_observer.h"
  21 #include "ash/shelf/shelf_widget.h"
  22 #include "ash/shell.h"
  23 #include "ash/shell_window_ids.h"
  24 #include "ash/system/status_area_widget.h"
  25 #include "ash/wm/gestures/shelf_gesture_handler.h"
  26 #include "ash/wm/lock_state_controller.h"
  27 #include "ash/wm/mru_window_tracker.h"
  28 #include "ash/wm/window_animations.h"
  29 #include "ash/wm/window_state.h"
  30 #include "ash/wm/window_util.h"
  31 #include "ash/wm/workspace_controller.h"
  32 #include "base/auto_reset.h"
  33 #include "base/command_line.h"
  34 #include "base/command_line.h"
  35 #include "base/i18n/rtl.h"
  36 #include "base/strings/string_number_conversions.h"
  37 #include "base/strings/string_util.h"
  38 #include "ui/aura/client/activation_client.h"
  39 #include "ui/aura/client/cursor_client.h"
  40 #include "ui/aura/root_window.h"
  41 #include "ui/base/ui_base_switches.h"
  42 #include "ui/compositor/layer.h"
  43 #include "ui/compositor/layer_animation_observer.h"
  44 #include "ui/compositor/layer_animator.h"
  45 #include "ui/compositor/scoped_layer_animation_settings.h"
  46 #include "ui/events/event.h"
  47 #include "ui/events/event_handler.h"
  48 #include "ui/gfx/screen.h"
  49 #include "ui/views/widget/widget.h"
  50
  51 namespace ash {
  52 namespace internal {
  53
  54 namespace {
  55
  56 // Delay before showing the launcher. This is after the mouse stops moving.
  57 const int kAutoHideDelayMS = 200;
  58
  59 // To avoid hiding the shelf when the mouse transitions from a message bubble
  60 // into the shelf, the hit test area is enlarged by this amount of pixels to
  61 // keep the shelf from hiding.
  62 const int kNotificationBubbleGapHeight = 6;
  63
  64 // The maximum size of the region on the display opposing the shelf managed by
  65 // this ShelfLayoutManager which can trigger showing the shelf.
  66 // For instance:
  67 // - Primary display is left of secondary display.
  68 // - Shelf is left aligned
  69 // - This ShelfLayoutManager manages the shelf for the secondary display.
  70 // |kMaxAutoHideShowShelfRegionSize| refers to the maximum size of the region
  71 // from the right edge of the primary display which can trigger showing the
  72 // auto hidden shelf. The region is used to make it easier to trigger showing
  73 // the auto hidden shelf when the shelf is on the boundary between displays.
  74 const int kMaxAutoHideShowShelfRegionSize = 10;
  75
  76 ui::Layer* GetLayer(views::Widget* widget) {
  77   return widget->GetNativeView()->layer();
  78 }
  79
  80 bool IsDraggingTrayEnabled() {
  81   static bool dragging_tray_allowed = CommandLine::ForCurrentProcess()->
  82       HasSwitch(ash::switches::kAshEnableTrayDragging);
  83   return dragging_tray_allowed;
  84 }
  85
  86 }  // namespace
  87
  88 // static
  89 const int ShelfLayoutManager::kWorkspaceAreaVisibleInset = 2;
  90
  91 // static
  92 const int ShelfLayoutManager::kWorkspaceAreaAutoHideInset = 5;
  93
  94 // static
  95 const int ShelfLayoutManager::kAutoHideSize = 3;
  96
  97 // static
  98 const int ShelfLayoutManager::kShelfSize = 47;
  99
 100 // static
 101 const int ShelfLayoutManager::kShelfItemInset = 3;
 102
 103 int ShelfLayoutManager::GetPreferredShelfSize() {
 104   return ash::switches::UseAlternateShelfLayout() ?
 105       ShelfLayoutManager::kShelfSize : kLauncherPreferredSize;
 106 }
 107
 108 // ShelfLayoutManager::AutoHideEventFilter -------------------------------------
 109
 110 // Notifies ShelfLayoutManager any time the mouse moves.
 111 class ShelfLayoutManager::AutoHideEventFilter : public ui::EventHandler {
 112  public:
 113   explicit AutoHideEventFilter(ShelfLayoutManager* shelf);
 114   virtual ~AutoHideEventFilter();
 115
 116   // Returns true if the last mouse event was a mouse drag.
 117   bool in_mouse_drag() const { return in_mouse_drag_; }
 118
 119   // Overridden from ui::EventHandler:
 120   virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
 121   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
 122
 123  private:
 124   ShelfLayoutManager* shelf_;
 125   bool in_mouse_drag_;
 126   ShelfGestureHandler gesture_handler_;
 127   DISALLOW_COPY_AND_ASSIGN(AutoHideEventFilter);
 128 };
 129
 130 ShelfLayoutManager::AutoHideEventFilter::AutoHideEventFilter(
 131     ShelfLayoutManager* shelf)
 132     : shelf_(shelf),
 133       in_mouse_drag_(false) {
 134   Shell::GetInstance()->AddPreTargetHandler(this);
 135 }
 136
 137 ShelfLayoutManager::AutoHideEventFilter::~AutoHideEventFilter() {
 138   Shell::GetInstance()->RemovePreTargetHandler(this);
 139 }
 140
 141 void ShelfLayoutManager::AutoHideEventFilter::OnMouseEvent(
 142     ui::MouseEvent* event) {
 143   // This also checks IsShelfWindow() to make sure we don't attempt to hide the
 144   // shelf if the mouse down occurs on the shelf.
 145   in_mouse_drag_ = (event->type() == ui::ET_MOUSE_DRAGGED ||
 146                     (in_mouse_drag_ && event->type() != ui::ET_MOUSE_RELEASED &&
 147                      event->type() != ui::ET_MOUSE_CAPTURE_CHANGED)) &&
 148       !shelf_->IsShelfWindow(static_cast<aura::Window*>(event->target()));
 149   if (event->type() == ui::ET_MOUSE_MOVED)
 150     shelf_->UpdateAutoHideState();
 151   return;
 152 }
 153
 154 void ShelfLayoutManager::AutoHideEventFilter::OnGestureEvent(
 155     ui::GestureEvent* event) {
 156   if (shelf_->IsShelfWindow(static_cast<aura::Window*>(event->target()))) {
 157     if (gesture_handler_.ProcessGestureEvent(*event))
 158       event->StopPropagation();
 159   }
 160 }
 161
 162 // ShelfLayoutManager:UpdateShelfObserver --------------------------------------
 163
 164 // UpdateShelfObserver is used to delay updating the background until the
 165 // animation completes.
 166 class ShelfLayoutManager::UpdateShelfObserver
 167     : public ui::ImplicitAnimationObserver {
 168  public:
 169   explicit UpdateShelfObserver(ShelfLayoutManager* shelf) : shelf_(shelf) {
 170     shelf_->update_shelf_observer_ = this;
 171   }
 172
 173   void Detach() {
 174     shelf_ = NULL;
 175   }
 176
 177   virtual void OnImplicitAnimationsCompleted() OVERRIDE {
 178     if (shelf_) {
 179       shelf_->UpdateShelfBackground(BackgroundAnimator::CHANGE_ANIMATE);
 180     }
 181     delete this;
 182   }
 183
 184  private:
 185   virtual ~UpdateShelfObserver() {
 186     if (shelf_)
 187       shelf_->update_shelf_observer_ = NULL;
 188   }
 189
 190   // Shelf we're in. NULL if deleted before we're deleted.
 191   ShelfLayoutManager* shelf_;
 192
 193   DISALLOW_COPY_AND_ASSIGN(UpdateShelfObserver);
 194 };
 195
 196 // ShelfLayoutManager ----------------------------------------------------------
 197
 198 ShelfLayoutManager::ShelfLayoutManager(ShelfWidget* shelf)
 199     : root_window_(shelf->GetNativeView()->GetRootWindow()),
 200       updating_bounds_(false),
 201       auto_hide_behavior_(SHELF_AUTO_HIDE_BEHAVIOR_NEVER),
 202       alignment_(SHELF_ALIGNMENT_BOTTOM),
 203       shelf_(shelf),
 204       workspace_controller_(NULL),
 205       window_overlaps_shelf_(false),
 206       mouse_over_shelf_when_auto_hide_timer_started_(false),
 207       bezel_event_filter_(new ShelfBezelEventFilter(this)),
 208       gesture_drag_status_(GESTURE_DRAG_NONE),
 209       gesture_drag_amount_(0.f),
 210       gesture_drag_auto_hide_state_(SHELF_AUTO_HIDE_SHOWN),
 211       update_shelf_observer_(NULL) {
 212   Shell::GetInstance()->AddShellObserver(this);
 213   Shell::GetInstance()->lock_state_controller()->AddObserver(this);
 214   aura::client::GetActivationClient(root_window_)->AddObserver(this);
 215 }
 216
 217 ShelfLayoutManager::~ShelfLayoutManager() {
 218   if (update_shelf_observer_)
 219     update_shelf_observer_->Detach();
 220
 221   FOR_EACH_OBSERVER(ShelfLayoutManagerObserver, observers_, WillDeleteShelf());
 222   Shell::GetInstance()->RemoveShellObserver(this);
 223   Shell::GetInstance()->lock_state_controller()->RemoveObserver(this);
 224   aura::client::GetActivationClient(root_window_)->RemoveObserver(this);
 225 }
 226
 227 void ShelfLayoutManager::SetAutoHideBehavior(ShelfAutoHideBehavior behavior) {
 228   if (auto_hide_behavior_ == behavior)
 229     return;
 230   auto_hide_behavior_ = behavior;
 231   UpdateVisibilityState();
 232   FOR_EACH_OBSERVER(ShelfLayoutManagerObserver, observers_,
 233                     OnAutoHideBehaviorChanged(root_window_,
 234                                               auto_hide_behavior_));
 235 }
 236
 237 void ShelfLayoutManager::PrepareForShutdown() {
 238   // Clear all event filters, otherwise sometimes those filters may catch
 239   // synthesized mouse event and cause crashes during the shutdown.
 240   set_workspace_controller(NULL);
 241   auto_hide_event_filter_.reset();
 242   bezel_event_filter_.reset();
 243 }
 244
 245 bool ShelfLayoutManager::IsVisible() const {
 246   // status_area_widget() may be NULL during the shutdown.
 247   return shelf_->status_area_widget() &&
 248       shelf_->status_area_widget()->IsVisible() &&
 249       (state_.visibility_state == SHELF_VISIBLE ||
 250        (state_.visibility_state == SHELF_AUTO_HIDE &&
 251         state_.auto_hide_state == SHELF_AUTO_HIDE_SHOWN));
 252 }
 253
 254 bool ShelfLayoutManager::SetAlignment(ShelfAlignment alignment) {
 255   if (alignment_ == alignment)
 256     return false;
 257
 258   // This should not be called during the lock screen transitions.
 259   DCHECK(!Shell::GetInstance()->session_state_delegate()->IsScreenLocked());
 260   alignment_ = alignment;
 261   shelf_->SetAlignment(alignment);
 262   LayoutShelf();
 263   return true;
 264 }
 265
 266 ShelfAlignment ShelfLayoutManager::GetAlignment() const {
 267   // When the screen is locked, the shelf is forced into bottom alignment.
 268   if (Shell::GetInstance()->session_state_delegate()->IsScreenLocked())
 269     return SHELF_ALIGNMENT_BOTTOM;
 270   return alignment_;
 271 }
 272
 273 gfx::Rect ShelfLayoutManager::GetIdealBounds() {
 274   gfx::Rect bounds(
 275       ScreenAsh::GetDisplayBoundsInParent(shelf_->GetNativeView()));
 276   int width = 0, height = 0;
 277   GetShelfSize(&width, &height);
 278   return SelectValueForShelfAlignment(
 279       gfx::Rect(bounds.x(), bounds.bottom() - height, bounds.width(), height),
 280       gfx::Rect(bounds.x(), bounds.y(), width, bounds.height()),
 281       gfx::Rect(bounds.right() - width, bounds.y(), width, bounds.height()),
 282       gfx::Rect(bounds.x(), bounds.y(), bounds.width(), height));
 283 }
 284
 285 void ShelfLayoutManager::LayoutShelf() {
 286   TargetBounds target_bounds;
 287   CalculateTargetBounds(state_, &target_bounds);
 288   UpdateBoundsAndOpacity(target_bounds, false, NULL);
 289
 290   if (shelf_->launcher()) {
 291     // This is not part of UpdateBoundsAndOpacity() because
 292     // SetShelfViewBounds() sets the bounds immediately and does not animate.
 293     // The height of the ShelfView for a horizontal shelf and the width of
 294     // the ShelfView for a vertical shelf are set when |shelf_|'s bounds
 295     // are changed via UpdateBoundsAndOpacity(). This sets the origin and the
 296     // dimension in the other direction.
 297     shelf_->launcher()->SetShelfViewBounds(
 298         target_bounds.launcher_bounds_in_shelf);
 299   }
 300 }
 301
 302 ShelfVisibilityState ShelfLayoutManager::CalculateShelfVisibility() {
 303   switch(auto_hide_behavior_) {
 304     case SHELF_AUTO_HIDE_BEHAVIOR_ALWAYS:
 305       return SHELF_AUTO_HIDE;
 306     case SHELF_AUTO_HIDE_BEHAVIOR_NEVER:
 307       return SHELF_VISIBLE;
 308     case SHELF_AUTO_HIDE_ALWAYS_HIDDEN:
 309       return SHELF_HIDDEN;
 310   }
 311   return SHELF_VISIBLE;
 312 }
 313
 314 void ShelfLayoutManager::UpdateVisibilityState() {
 315   if (Shell::GetInstance()->session_state_delegate()->IsScreenLocked()) {
 316     SetState(SHELF_VISIBLE);
 317   } else {
 318     // TODO(zelidrag): Verify shelf drag animation still shows on the device
 319     // when we are in SHELF_AUTO_HIDE_ALWAYS_HIDDEN.
 320     WorkspaceWindowState window_state(workspace_controller_->GetWindowState());
 321     switch (window_state) {
 322       case WORKSPACE_WINDOW_STATE_FULL_SCREEN:
 323         if (FullscreenWithHiddenShelf()) {
 324           SetState(SHELF_HIDDEN);
 325         } else {
 326           // The shelf is sometimes not hidden when in immersive fullscreen.
 327           // Force the shelf to be auto hidden in this case.
 328           SetState(SHELF_AUTO_HIDE);
 329         }
 330         break;
 331       case WORKSPACE_WINDOW_STATE_MAXIMIZED:
 332         SetState(CalculateShelfVisibility());
 333         break;
 334       case WORKSPACE_WINDOW_STATE_WINDOW_OVERLAPS_SHELF:
 335       case WORKSPACE_WINDOW_STATE_DEFAULT:
 336         SetState(CalculateShelfVisibility());
 337         SetWindowOverlapsShelf(window_state ==
 338                                WORKSPACE_WINDOW_STATE_WINDOW_OVERLAPS_SHELF);
 339         break;
 340     }
 341   }
 342 }
 343
 344 void ShelfLayoutManager::UpdateAutoHideState() {
 345   ShelfAutoHideState auto_hide_state =
 346       CalculateAutoHideState(state_.visibility_state);
 347   if (auto_hide_state != state_.auto_hide_state) {
 348     if (auto_hide_state == SHELF_AUTO_HIDE_HIDDEN) {
 349       // Hides happen immediately.
 350       SetState(state_.visibility_state);
 351     } else {
 352       if (!auto_hide_timer_.IsRunning()) {
 353         mouse_over_shelf_when_auto_hide_timer_started_ =
 354             shelf_->GetWindowBoundsInScreen().Contains(
 355                 Shell::GetScreen()->GetCursorScreenPoint());
 356       }
 357       auto_hide_timer_.Start(
 358           FROM_HERE,
 359           base::TimeDelta::FromMilliseconds(kAutoHideDelayMS),
 360           this, &ShelfLayoutManager::UpdateAutoHideStateNow);
 361     }
 362   } else {
 363     StopAutoHideTimer();
 364   }
 365 }
 366
 367 void ShelfLayoutManager::SetWindowOverlapsShelf(bool value) {
 368   window_overlaps_shelf_ = value;
 369   UpdateShelfBackground(BackgroundAnimator::CHANGE_ANIMATE);
 370 }
 371
 372 void ShelfLayoutManager::AddObserver(ShelfLayoutManagerObserver* observer) {
 373   observers_.AddObserver(observer);
 374 }
 375
 376 void ShelfLayoutManager::RemoveObserver(ShelfLayoutManagerObserver* observer) {
 377   observers_.RemoveObserver(observer);
 378 }
 379
 380 ////////////////////////////////////////////////////////////////////////////////
 381 // ShelfLayoutManager, Gesture dragging:
 382
 383 void ShelfLayoutManager::StartGestureDrag(const ui::GestureEvent& gesture) {
 384   gesture_drag_status_ = GESTURE_DRAG_IN_PROGRESS;
 385   gesture_drag_amount_ = 0.f;
 386   gesture_drag_auto_hide_state_ = visibility_state() == SHELF_AUTO_HIDE ?
 387       auto_hide_state() : SHELF_AUTO_HIDE_SHOWN;
 388   UpdateShelfBackground(BackgroundAnimator::CHANGE_ANIMATE);
 389 }
 390
 391 ShelfLayoutManager::DragState ShelfLayoutManager::UpdateGestureDrag(
 392     const ui::GestureEvent& gesture) {
 393   bool horizontal = IsHorizontalAlignment();
 394   gesture_drag_amount_ += horizontal ? gesture.details().scroll_y() :
 395                                        gesture.details().scroll_x();
 396   LayoutShelf();
 397
 398   // Start reveling the status menu when:
 399   //   - dragging up on an already visible shelf
 400   //   - dragging up on a hidden shelf, but it is currently completely visible.
 401   if (horizontal && gesture.details().scroll_y() < 0) {
 402     int min_height = 0;
 403     if (gesture_drag_auto_hide_state_ == SHELF_AUTO_HIDE_HIDDEN && shelf_)
 404       min_height = shelf_->GetContentsView()->GetPreferredSize().height();
 405
 406     if (min_height < shelf_->GetWindowBoundsInScreen().height() &&
 407         gesture.root_location().x() >=
 408         shelf_->status_area_widget()->GetWindowBoundsInScreen().x() &&
 409         IsDraggingTrayEnabled())
 410       return DRAG_TRAY;
 411   }
 412
 413   return DRAG_SHELF;
 414 }
 415
 416 void ShelfLayoutManager::CompleteGestureDrag(const ui::GestureEvent& gesture) {
 417   bool horizontal = IsHorizontalAlignment();
 418   bool should_change = false;
 419   if (gesture.type() == ui::ET_GESTURE_SCROLL_END) {
 420     // The visibility of the shelf changes only if the shelf was dragged X%
 421     // along the correct axis. If the shelf was already visible, then the
 422     // direction of the drag does not matter.
 423     const float kDragHideThreshold = 0.4f;
 424     gfx::Rect bounds = GetIdealBounds();
 425     float drag_ratio = fabs(gesture_drag_amount_) /
 426                        (horizontal ?  bounds.height() : bounds.width());
 427     if (gesture_drag_auto_hide_state_ == SHELF_AUTO_HIDE_SHOWN) {
 428       should_change = drag_ratio > kDragHideThreshold;
 429     } else {
 430       bool correct_direction = false;
 431       switch (GetAlignment()) {
 432         case SHELF_ALIGNMENT_BOTTOM:
 433         case SHELF_ALIGNMENT_RIGHT:
 434           correct_direction = gesture_drag_amount_ < 0;
 435           break;
 436         case SHELF_ALIGNMENT_LEFT:
 437         case SHELF_ALIGNMENT_TOP:
 438           correct_direction = gesture_drag_amount_ > 0;
 439           break;
 440       }
 441       should_change = correct_direction && drag_ratio > kDragHideThreshold;
 442     }
 443   } else if (gesture.type() == ui::ET_SCROLL_FLING_START) {
 444     if (gesture_drag_auto_hide_state_ == SHELF_AUTO_HIDE_SHOWN) {
 445       should_change = horizontal ? fabs(gesture.details().velocity_y()) > 0 :
 446                                    fabs(gesture.details().velocity_x()) > 0;
 447     } else {
 448       should_change = SelectValueForShelfAlignment(
 449           gesture.details().velocity_y() < 0,
 450           gesture.details().velocity_x() > 0,
 451           gesture.details().velocity_x() < 0,
 452           gesture.details().velocity_y() > 0);
 453     }
 454   } else {
 455     NOTREACHED();
 456   }
 457
 458   if (!should_change) {
 459     CancelGestureDrag();
 460     return;
 461   }
 462   if (shelf_) {
 463     shelf_->Deactivate();
 464     shelf_->status_area_widget()->Deactivate();
 465   }
 466   gesture_drag_auto_hide_state_ =
 467       gesture_drag_auto_hide_state_ == SHELF_AUTO_HIDE_SHOWN ?
 468       SHELF_AUTO_HIDE_HIDDEN : SHELF_AUTO_HIDE_SHOWN;
 469   ShelfAutoHideBehavior new_auto_hide_behavior =
 470       gesture_drag_auto_hide_state_ == SHELF_AUTO_HIDE_SHOWN ?
 471       SHELF_AUTO_HIDE_BEHAVIOR_NEVER : SHELF_AUTO_HIDE_BEHAVIOR_ALWAYS;
 472
 473   // When in fullscreen and the shelf is forced to be auto hidden, the auto hide
 474   // behavior affects neither the visibility state nor the auto hide state. Set
 475   // |gesture_drag_status_| to GESTURE_DRAG_COMPLETE_IN_PROGRESS to set the auto
 476   // hide state to |gesture_drag_auto_hide_state_|.
 477   gesture_drag_status_ = GESTURE_DRAG_COMPLETE_IN_PROGRESS;
 478   if (auto_hide_behavior_ != new_auto_hide_behavior)
 479     SetAutoHideBehavior(new_auto_hide_behavior);
 480   else
 481     UpdateVisibilityState();
 482   gesture_drag_status_ = GESTURE_DRAG_NONE;
 483 }
 484
 485 void ShelfLayoutManager::CancelGestureDrag() {
 486   gesture_drag_status_ = GESTURE_DRAG_CANCEL_IN_PROGRESS;
 487   UpdateVisibilityState();
 488   gesture_drag_status_ = GESTURE_DRAG_NONE;
 489 }
 490
 491 ////////////////////////////////////////////////////////////////////////////////
 492 // ShelfLayoutManager, aura::LayoutManager implementation:
 493
 494 void ShelfLayoutManager::OnWindowResized() {
 495   LayoutShelf();
 496 }
 497
 498 void ShelfLayoutManager::OnWindowAddedToLayout(aura::Window* child) {
 499 }
 500
 501 void ShelfLayoutManager::OnWillRemoveWindowFromLayout(aura::Window* child) {
 502 }
 503
 504 void ShelfLayoutManager::OnWindowRemovedFromLayout(aura::Window* child) {
 505 }
 506
 507 void ShelfLayoutManager::OnChildWindowVisibilityChanged(aura::Window* child,
 508                                                         bool visible) {
 509 }
 510
 511 void ShelfLayoutManager::SetChildBounds(aura::Window* child,
 512                                         const gfx::Rect& requested_bounds) {
 513   SetChildBoundsDirect(child, requested_bounds);
 514   // We may contain other widgets (such as frame maximize bubble) but they don't
 515   // effect the layout in anyway.
 516   if (!updating_bounds_ &&
 517       ((shelf_->GetNativeView() == child) ||
 518        (shelf_->status_area_widget()->GetNativeView() == child))) {
 519     LayoutShelf();
 520   }
 521 }
 522
 523 void ShelfLayoutManager::OnLockStateChanged(bool locked) {
 524   // Force the shelf to layout for alignment (bottom if locked, restore
 525   // the previous alignment otherwise).
 526   shelf_->SetAlignment(locked ? SHELF_ALIGNMENT_BOTTOM : alignment_);
 527   UpdateVisibilityState();
 528   LayoutShelf();
 529 }
 530
 531 void ShelfLayoutManager::OnWindowActivated(aura::Window* gained_active,
 532                                            aura::Window* lost_active) {
 533   UpdateAutoHideStateNow();
 534 }
 535
 536 bool ShelfLayoutManager::IsHorizontalAlignment() const {
 537   return GetAlignment() == SHELF_ALIGNMENT_BOTTOM ||
 538          GetAlignment() == SHELF_ALIGNMENT_TOP;
 539 }
 540
 541 bool ShelfLayoutManager::FullscreenWithHiddenShelf() const {
 542   RootWindowController* controller = GetRootWindowController(root_window_);
 543   if (!controller)
 544     return false;
 545   const aura::Window* window = controller->GetTopmostFullscreenWindow();
 546   if (!window)
 547     return false;
 548   return wm::GetWindowState(window)->hide_shelf_when_fullscreen();
 549 }
 550
 551 // static
 552 ShelfLayoutManager* ShelfLayoutManager::ForLauncher(aura::Window* window) {
 553   ShelfWidget* shelf = RootWindowController::ForLauncher(window)->shelf();
 554   return shelf ? shelf->shelf_layout_manager() : NULL;
 555 }
 556
 557 ////////////////////////////////////////////////////////////////////////////////
 558 // ShelfLayoutManager, private:
 559
 560 ShelfLayoutManager::TargetBounds::TargetBounds() : opacity(0.0f) {}
 561 ShelfLayoutManager::TargetBounds::~TargetBounds() {}
 562
 563 void ShelfLayoutManager::SetState(ShelfVisibilityState visibility_state) {
 564   if (!shelf_->GetNativeView())
 565     return;
 566
 567   State state;
 568   state.visibility_state = visibility_state;
 569   state.auto_hide_state = CalculateAutoHideState(visibility_state);
 570   state.is_screen_locked =
 571       Shell::GetInstance()->session_state_delegate()->IsScreenLocked();
 572   state.window_state = workspace_controller_ ?
 573       workspace_controller_->GetWindowState() : WORKSPACE_WINDOW_STATE_DEFAULT;
 574
 575   // Force an update because gesture drags affect the shelf bounds and we
 576   // should animate back to the normal bounds at the end of a gesture.
 577   bool force_update =
 578       (gesture_drag_status_ == GESTURE_DRAG_CANCEL_IN_PROGRESS ||
 579        gesture_drag_status_ == GESTURE_DRAG_COMPLETE_IN_PROGRESS);
 580
 581   if (!force_update && state_.Equals(state))
 582     return;  // Nothing changed.
 583
 584   FOR_EACH_OBSERVER(ShelfLayoutManagerObserver, observers_,
 585                     WillChangeVisibilityState(visibility_state));
 586
 587   if (state.visibility_state == SHELF_AUTO_HIDE) {
 588     // When state is SHELF_AUTO_HIDE we need to track when the mouse is over the
 589     // launcher to unhide the shelf. AutoHideEventFilter does that for us.
 590     if (!auto_hide_event_filter_)
 591       auto_hide_event_filter_.reset(new AutoHideEventFilter(this));
 592   } else {
 593     auto_hide_event_filter_.reset(NULL);
 594   }
 595
 596   StopAutoHideTimer();
 597
 598   State old_state = state_;
 599   state_ = state;
 600
 601   BackgroundAnimator::ChangeType change_type =
 602       BackgroundAnimator::CHANGE_ANIMATE;
 603   bool delay_background_change = false;
 604
 605   // Do not animate the background when:
 606   // - Going from a hidden / auto hidden shelf in fullscreen to a visible shelf
 607   //   in maximized mode.
 608   // - Going from an auto hidden shelf in maximized mode to a visible shelf in
 609   //   maximized mode.
 610   if (state.visibility_state == SHELF_VISIBLE &&
 611       state.window_state == WORKSPACE_WINDOW_STATE_MAXIMIZED &&
 612       old_state.visibility_state != SHELF_VISIBLE) {
 613     change_type = BackgroundAnimator::CHANGE_IMMEDIATE;
 614   } else {
 615     // Delay the animation when the shelf was hidden, and has just been made
 616     // visible (e.g. using a gesture-drag).
 617     if (state.visibility_state == SHELF_VISIBLE &&
 618         old_state.visibility_state == SHELF_AUTO_HIDE &&
 619         old_state.auto_hide_state == SHELF_AUTO_HIDE_HIDDEN) {
 620       delay_background_change = true;
 621     }
 622   }
 623
 624   if (delay_background_change) {
 625     if (update_shelf_observer_)
 626       update_shelf_observer_->Detach();
 627     // UpdateShelfBackground deletes itself when the animation is done.
 628     update_shelf_observer_ = new UpdateShelfObserver(this);
 629   } else {
 630     UpdateShelfBackground(change_type);
 631   }
 632
 633   shelf_->SetDimsShelf(
 634       state.visibility_state == SHELF_VISIBLE &&
 635       state.window_state == WORKSPACE_WINDOW_STATE_MAXIMIZED);
 636
 637   TargetBounds target_bounds;
 638   CalculateTargetBounds(state_, &target_bounds);
 639   UpdateBoundsAndOpacity(target_bounds, true,
 640       delay_background_change ? update_shelf_observer_ : NULL);
 641
 642   // OnAutoHideStateChanged Should be emitted when:
 643   //  - firstly state changed to auto-hide from other state
 644   //  - or, auto_hide_state has changed
 645   if ((old_state.visibility_state != state_.visibility_state &&
 646        state_.visibility_state == SHELF_AUTO_HIDE) ||
 647       old_state.auto_hide_state != state_.auto_hide_state) {
 648     FOR_EACH_OBSERVER(ShelfLayoutManagerObserver, observers_,
 649                       OnAutoHideStateChanged(state_.auto_hide_state));
 650   }
 651 }
 652
 653 void ShelfLayoutManager::UpdateBoundsAndOpacity(
 654     const TargetBounds& target_bounds,
 655     bool animate,
 656     ui::ImplicitAnimationObserver* observer) {
 657   base::AutoReset<bool> auto_reset_updating_bounds(&updating_bounds_, true);
 658
 659   ui::ScopedLayerAnimationSettings launcher_animation_setter(
 660       GetLayer(shelf_)->GetAnimator());
 661   ui::ScopedLayerAnimationSettings status_animation_setter(
 662       GetLayer(shelf_->status_area_widget())->GetAnimator());
 663   if (animate) {
 664     launcher_animation_setter.SetTransitionDuration(
 665         base::TimeDelta::FromMilliseconds(kCrossFadeDurationMS));
 666     launcher_animation_setter.SetTweenType(gfx::Tween::EASE_OUT);
 667     launcher_animation_setter.SetPreemptionStrategy(
 668         ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
 669     status_animation_setter.SetTransitionDuration(
 670         base::TimeDelta::FromMilliseconds(kCrossFadeDurationMS));
 671     status_animation_setter.SetTweenType(gfx::Tween::EASE_OUT);
 672     status_animation_setter.SetPreemptionStrategy(
 673         ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
 674   } else {
 675     StopAnimating();
 676     launcher_animation_setter.SetTransitionDuration(base::TimeDelta());
 677     status_animation_setter.SetTransitionDuration(base::TimeDelta());
 678   }
 679   if (observer)
 680     status_animation_setter.AddObserver(observer);
 681
 682   GetLayer(shelf_)->SetOpacity(target_bounds.opacity);
 683   shelf_->SetBounds(ScreenAsh::ConvertRectToScreen(
 684        shelf_->GetNativeView()->parent(),
 685        target_bounds.shelf_bounds_in_root));
 686
 687   GetLayer(shelf_->status_area_widget())->SetOpacity(
 688       target_bounds.status_opacity);
 689   // TODO(harrym): Once status area widget is a child view of shelf
 690   // this can be simplified.
 691   gfx::Rect status_bounds = target_bounds.status_bounds_in_shelf;
 692   status_bounds.set_x(status_bounds.x() +
 693                       target_bounds.shelf_bounds_in_root.x());
 694   status_bounds.set_y(status_bounds.y() +
 695                       target_bounds.shelf_bounds_in_root.y());
 696   shelf_->status_area_widget()->SetBounds(
 697       ScreenAsh::ConvertRectToScreen(
 698           shelf_->status_area_widget()->GetNativeView()->parent(),
 699           status_bounds));
 700   Shell::GetInstance()->SetDisplayWorkAreaInsets(
 701       root_window_, target_bounds.work_area_insets);
 702   UpdateHitTestBounds();
 703 }
 704
 705 void ShelfLayoutManager::StopAnimating() {
 706   GetLayer(shelf_)->GetAnimator()->StopAnimating();
 707   GetLayer(shelf_->status_area_widget())->GetAnimator()->StopAnimating();
 708 }
 709
 710 void ShelfLayoutManager::GetShelfSize(int* width, int* height) {
 711   *width = *height = 0;
 712   gfx::Size status_size(
 713       shelf_->status_area_widget()->GetWindowBoundsInScreen().size());
 714   if (IsHorizontalAlignment())
 715     *height = GetPreferredShelfSize();
 716   else
 717     *width = GetPreferredShelfSize();
 718 }
 719
 720 void ShelfLayoutManager::AdjustBoundsBasedOnAlignment(int inset,
 721                                                       gfx::Rect* bounds) const {
 722   bounds->Inset(SelectValueForShelfAlignment(
 723       gfx::Insets(0, 0, inset, 0),
 724       gfx::Insets(0, inset, 0, 0),
 725       gfx::Insets(0, 0, 0, inset),
 726       gfx::Insets(inset, 0, 0, 0)));
 727 }
 728
 729 void ShelfLayoutManager::CalculateTargetBounds(
 730     const State& state,
 731     TargetBounds* target_bounds) {
 732   const gfx::Rect available_bounds(GetAvailableBounds());
 733   gfx::Rect status_size(
 734       shelf_->status_area_widget()->GetWindowBoundsInScreen().size());
 735   int shelf_width = 0, shelf_height = 0;
 736   GetShelfSize(&shelf_width, &shelf_height);
 737   if (IsHorizontalAlignment())
 738     shelf_width = available_bounds.width();
 739   else
 740     shelf_height = available_bounds.height();
 741
 742   if (state.visibility_state == SHELF_AUTO_HIDE &&
 743       state.auto_hide_state == SHELF_AUTO_HIDE_HIDDEN) {
 744     // Auto-hidden shelf always starts with the default size. If a gesture-drag
 745     // is in progress, then the call to UpdateTargetBoundsForGesture() below
 746     // takes care of setting the height properly.
 747     if (IsHorizontalAlignment())
 748       shelf_height = kAutoHideSize;
 749     else
 750       shelf_width = kAutoHideSize;
 751   } else if (state.visibility_state == SHELF_HIDDEN ||
 752       !keyboard_bounds_.IsEmpty()) {
 753     if (IsHorizontalAlignment())
 754       shelf_height = 0;
 755     else
 756       shelf_width = 0;
 757   }
 758
 759   target_bounds->shelf_bounds_in_root = SelectValueForShelfAlignment(
 760       gfx::Rect(available_bounds.x(), available_bounds.bottom() - shelf_height,
 761                     available_bounds.width(), shelf_height),
 762       gfx::Rect(available_bounds.x(), available_bounds.y(),
 763                     shelf_width, available_bounds.height()),
 764       gfx::Rect(available_bounds.right() - shelf_width, available_bounds.y(),
 765                     shelf_width, available_bounds.height()),
 766       gfx::Rect(available_bounds.x(), available_bounds.y(),
 767                     available_bounds.width(), shelf_height));
 768
 769   int status_inset = std::max(0, GetPreferredShelfSize() -
 770       PrimaryAxisValue(status_size.height(), status_size.width()));
 771
 772   if (ash::switches::UseAlternateShelfLayout()) {
 773     status_inset = 0;
 774     if (IsHorizontalAlignment())
 775       status_size.set_height(kShelfSize);
 776     else
 777       status_size.set_width(kShelfSize);
 778   }
 779
 780   target_bounds->status_bounds_in_shelf = SelectValueForShelfAlignment(
 781       gfx::Rect(base::i18n::IsRTL() ? 0 : shelf_width - status_size.width(),
 782                     status_inset, status_size.width(), status_size.height()),
 783       gfx::Rect(shelf_width - (status_size.width() + status_inset),
 784                     shelf_height - status_size.height(), status_size.width(),
 785                     status_size.height()),
 786       gfx::Rect(status_inset, shelf_height - status_size.height(),
 787                     status_size.width(), status_size.height()),
 788       gfx::Rect(base::i18n::IsRTL() ? 0 : shelf_width - status_size.width(),
 789                     shelf_height - (status_size.height() + status_inset),
 790                     status_size.width(), status_size.height()));
 791
 792   target_bounds->work_area_insets = SelectValueForShelfAlignment(
 793       gfx::Insets(0, 0, GetWorkAreaSize(state, shelf_height), 0),
 794       gfx::Insets(0, GetWorkAreaSize(state, shelf_width), 0, 0),
 795       gfx::Insets(0, 0, 0, GetWorkAreaSize(state, shelf_width)),
 796       gfx::Insets(GetWorkAreaSize(state, shelf_height), 0, 0, 0));
 797
 798   // TODO(varkha): The functionality of managing insets for display areas
 799   // should probably be pushed to a separate component. This would simplify or
 800   // remove entirely the dependency on keyboard and dock.
 801
 802   // Also push in the work area inset for the keyboard if it is visible.
 803   if (!keyboard_bounds_.IsEmpty()) {
 804     gfx::Insets keyboard_insets(0, 0, keyboard_bounds_.height(), 0);
 805     target_bounds->work_area_insets += keyboard_insets;
 806   }
 807
 808   // Also push in the work area inset for the dock if it is visible.
 809   if (!dock_bounds_.IsEmpty()) {
 810     gfx::Insets dock_insets(
 811         0, (dock_bounds_.x() > 0 ? 0 : dock_bounds_.width()),
 812         0, (dock_bounds_.x() > 0 ? dock_bounds_.width() : 0));
 813     target_bounds->work_area_insets += dock_insets;
 814   }
 815
 816   target_bounds->opacity =
 817       (gesture_drag_status_ == GESTURE_DRAG_IN_PROGRESS ||
 818        state.visibility_state == SHELF_VISIBLE ||
 819        state.visibility_state == SHELF_AUTO_HIDE) ? 1.0f : 0.0f;
 820   target_bounds->status_opacity =
 821       (state.visibility_state == SHELF_AUTO_HIDE &&
 822        state.auto_hide_state == SHELF_AUTO_HIDE_HIDDEN &&
 823        gesture_drag_status_ != GESTURE_DRAG_IN_PROGRESS) ?
 824       0.0f : target_bounds->opacity;
 825
 826   if (gesture_drag_status_ == GESTURE_DRAG_IN_PROGRESS)
 827     UpdateTargetBoundsForGesture(target_bounds);
 828
 829   // This needs to happen after calling UpdateTargetBoundsForGesture(), because
 830   // that can change the size of the shelf.
 831   target_bounds->launcher_bounds_in_shelf = SelectValueForShelfAlignment(
 832       gfx::Rect(0, 0,
 833                 shelf_width - status_size.width(),
 834                 target_bounds->shelf_bounds_in_root.height()),
 835       gfx::Rect(0, 0, target_bounds->shelf_bounds_in_root.width(),
 836                 shelf_height - status_size.height()),
 837       gfx::Rect(0, 0, target_bounds->shelf_bounds_in_root.width(),
 838                 shelf_height - status_size.height()),
 839       gfx::Rect(0, 0,
 840                 shelf_width - status_size.width(),
 841                 target_bounds->shelf_bounds_in_root.height()));
 842 }
 843
 844 void ShelfLayoutManager::UpdateTargetBoundsForGesture(
 845     TargetBounds* target_bounds) const {
 846   CHECK_EQ(GESTURE_DRAG_IN_PROGRESS, gesture_drag_status_);
 847   bool horizontal = IsHorizontalAlignment();
 848   const gfx::Rect& available_bounds(root_window_->bounds());
 849   int resistance_free_region = 0;
 850
 851   if (gesture_drag_auto_hide_state_ == SHELF_AUTO_HIDE_HIDDEN &&
 852       visibility_state() == SHELF_AUTO_HIDE &&
 853       auto_hide_state() != SHELF_AUTO_HIDE_SHOWN) {
 854     // If the shelf was hidden when the drag started (and the state hasn't
 855     // changed since then, e.g. because the tray-menu was shown because of the
 856     // drag), then allow the drag some resistance-free region at first to make
 857     // sure the shelf sticks with the finger until the shelf is visible.
 858     resistance_free_region = GetPreferredShelfSize() - kAutoHideSize;
 859   }
 860
 861   bool resist = SelectValueForShelfAlignment(
 862       gesture_drag_amount_ < -resistance_free_region,
 863       gesture_drag_amount_ > resistance_free_region,
 864       gesture_drag_amount_ < -resistance_free_region,
 865       gesture_drag_amount_ > resistance_free_region);
 866
 867   float translate = 0.f;
 868   if (resist) {
 869     float diff = fabsf(gesture_drag_amount_) - resistance_free_region;
 870     diff = std::min(diff, sqrtf(diff));
 871     if (gesture_drag_amount_ < 0)
 872       translate = -resistance_free_region - diff;
 873     else
 874       translate = resistance_free_region + diff;
 875   } else {
 876     translate = gesture_drag_amount_;
 877   }
 878
 879   if (horizontal) {
 880     // Move and size the launcher with the gesture.
 881     int shelf_height = target_bounds->shelf_bounds_in_root.height() - translate;
 882     shelf_height = std::max(shelf_height, kAutoHideSize);
 883     target_bounds->shelf_bounds_in_root.set_height(shelf_height);
 884     if (GetAlignment() == SHELF_ALIGNMENT_BOTTOM) {
 885       target_bounds->shelf_bounds_in_root.set_y(
 886           available_bounds.bottom() - shelf_height);
 887     }
 888
 889     if (ash::switches::UseAlternateShelfLayout()) {
 890       target_bounds->status_bounds_in_shelf.set_y(0);
 891     } else {
 892       // The statusbar should be in the center of the shelf.
 893       gfx::Rect status_y = target_bounds->shelf_bounds_in_root;
 894       status_y.set_y(0);
 895       status_y.ClampToCenteredSize(
 896           target_bounds->status_bounds_in_shelf.size());
 897       target_bounds->status_bounds_in_shelf.set_y(status_y.y());
 898     }
 899   } else {
 900     // Move and size the launcher with the gesture.
 901     int shelf_width = target_bounds->shelf_bounds_in_root.width();
 902     bool right_aligned = GetAlignment() == SHELF_ALIGNMENT_RIGHT;
 903     if (right_aligned)
 904       shelf_width -= translate;
 905     else
 906       shelf_width += translate;
 907     shelf_width = std::max(shelf_width, kAutoHideSize);
 908     target_bounds->shelf_bounds_in_root.set_width(shelf_width);
 909     if (right_aligned) {
 910       target_bounds->shelf_bounds_in_root.set_x(
 911           available_bounds.right() - shelf_width);
 912     }
 913
 914     if (ash::switches::UseAlternateShelfLayout()) {
 915       if (right_aligned)
 916         target_bounds->status_bounds_in_shelf.set_x(0);
 917       else
 918         target_bounds->status_bounds_in_shelf.set_x(
 919             target_bounds->shelf_bounds_in_root.width() -
 920             kShelfSize);
 921     } else {
 922       // The statusbar should be in the center of the shelf.
 923       gfx::Rect status_x = target_bounds->shelf_bounds_in_root;
 924       status_x.set_x(0);
 925       status_x.ClampToCenteredSize(
 926           target_bounds->status_bounds_in_shelf.size());
 927       target_bounds->status_bounds_in_shelf.set_x(status_x.x());
 928     }
 929   }
 930 }
 931
 932 void ShelfLayoutManager::UpdateShelfBackground(
 933     BackgroundAnimator::ChangeType type) {
 934   shelf_->SetPaintsBackground(GetShelfBackgroundType(), type);
 935 }
 936
 937 ShelfBackgroundType ShelfLayoutManager::GetShelfBackgroundType() const {
 938   if (state_.visibility_state != SHELF_AUTO_HIDE &&
 939       state_.window_state == WORKSPACE_WINDOW_STATE_MAXIMIZED) {
 940     return SHELF_BACKGROUND_MAXIMIZED;
 941   }
 942
 943   if (gesture_drag_status_ == GESTURE_DRAG_IN_PROGRESS ||
 944       (!state_.is_screen_locked && window_overlaps_shelf_) ||
 945       (state_.visibility_state == SHELF_AUTO_HIDE)) {
 946     return SHELF_BACKGROUND_OVERLAP;
 947   }
 948
 949   return SHELF_BACKGROUND_DEFAULT;
 950 }
 951
 952 void ShelfLayoutManager::UpdateAutoHideStateNow() {
 953   SetState(state_.visibility_state);
 954
 955   // If the state did not change, the auto hide timer may still be running.
 956   StopAutoHideTimer();
 957 }
 958
 959 void ShelfLayoutManager::StopAutoHideTimer() {
 960   auto_hide_timer_.Stop();
 961   mouse_over_shelf_when_auto_hide_timer_started_ = false;
 962 }
 963
 964 gfx::Rect ShelfLayoutManager::GetAutoHideShowShelfRegionInScreen() const {
 965   gfx::Rect shelf_bounds_in_screen = shelf_->GetWindowBoundsInScreen();
 966   gfx::Vector2d offset = SelectValueForShelfAlignment(
 967       gfx::Vector2d(0, shelf_bounds_in_screen.height()),
 968       gfx::Vector2d(-kMaxAutoHideShowShelfRegionSize, 0),
 969       gfx::Vector2d(shelf_bounds_in_screen.width(), 0),
 970       gfx::Vector2d(0, -kMaxAutoHideShowShelfRegionSize));
 971
 972   gfx::Rect show_shelf_region_in_screen = shelf_bounds_in_screen;
 973   show_shelf_region_in_screen += offset;
 974   if (IsHorizontalAlignment())
 975     show_shelf_region_in_screen.set_height(kMaxAutoHideShowShelfRegionSize);
 976   else
 977     show_shelf_region_in_screen.set_width(kMaxAutoHideShowShelfRegionSize);
 978
 979   // TODO: Figure out if we need any special handling when the keyboard is
 980   // visible.
 981   return show_shelf_region_in_screen;
 982 }
 983
 984 ShelfAutoHideState ShelfLayoutManager::CalculateAutoHideState(
 985     ShelfVisibilityState visibility_state) const {
 986   if (visibility_state != SHELF_AUTO_HIDE || !shelf_)
 987     return SHELF_AUTO_HIDE_HIDDEN;
 988
 989   Shell* shell = Shell::GetInstance();
 990   if (shell->GetAppListTargetVisibility())
 991     return SHELF_AUTO_HIDE_SHOWN;
 992
 993   if (shelf_->status_area_widget() &&
 994       shelf_->status_area_widget()->ShouldShowLauncher())
 995     return SHELF_AUTO_HIDE_SHOWN;
 996
 997   if (shelf_->launcher() && shelf_->launcher()->IsShowingMenu())
 998     return SHELF_AUTO_HIDE_SHOWN;
 999
1000   if (shelf_->launcher() && shelf_->launcher()->IsShowingOverflowBubble())
1001     return SHELF_AUTO_HIDE_SHOWN;
1002
1003   if (shelf_->IsActive() || shelf_->status_area_widget()->IsActive())
1004     return SHELF_AUTO_HIDE_SHOWN;
1005
1006   const std::vector<aura::Window*> windows =
1007       ash::MruWindowTracker::BuildWindowList(false);
1008
1009   // Process the window list and check if there are any visible windows.
1010   bool visible_window = false;
1011   for (size_t i = 0; i < windows.size(); ++i) {
1012     if (windows[i] && windows[i]->IsVisible() &&
1013         !wm::GetWindowState(windows[i])->IsMinimized() &&
1014         root_window_ == windows[i]->GetRootWindow()) {
1015       visible_window = true;
1016       break;
1017     }
1018   }
1019   // If there are no visible windows do not hide the shelf.
1020   if (!visible_window)
1021     return SHELF_AUTO_HIDE_SHOWN;
1022
1023   if (gesture_drag_status_ == GESTURE_DRAG_COMPLETE_IN_PROGRESS)
1024     return gesture_drag_auto_hide_state_;
1025
1026   // Don't show if the user is dragging the mouse.
1027   if (auto_hide_event_filter_.get() && auto_hide_event_filter_->in_mouse_drag())
1028     return SHELF_AUTO_HIDE_HIDDEN;
1029
1030   // Ignore the mouse position if mouse events are disabled.
1031   aura::client::CursorClient* cursor_client = aura::client::GetCursorClient(
1032       shelf_->GetNativeWindow()->GetRootWindow());
1033   if (!cursor_client->IsMouseEventsEnabled())
1034     return SHELF_AUTO_HIDE_HIDDEN;
1035
1036   gfx::Rect shelf_region = shelf_->GetWindowBoundsInScreen();
1037   if (shelf_->status_area_widget() &&
1038       shelf_->status_area_widget()->IsMessageBubbleShown() &&
1039       IsVisible()) {
1040     // Increase the the hit test area to prevent the shelf from disappearing
1041     // when the mouse is over the bubble gap.
1042     ShelfAlignment alignment = GetAlignment();
1043     shelf_region.Inset(alignment == SHELF_ALIGNMENT_RIGHT ?
1044                            -kNotificationBubbleGapHeight : 0,
1045                        alignment == SHELF_ALIGNMENT_BOTTOM ?
1046                            -kNotificationBubbleGapHeight : 0,
1047                        alignment == SHELF_ALIGNMENT_LEFT ?
1048                            -kNotificationBubbleGapHeight : 0,
1049                        alignment == SHELF_ALIGNMENT_TOP ?
1050                            -kNotificationBubbleGapHeight : 0);
1051   }
1052
1053   gfx::Point cursor_position_in_screen =
1054       Shell::GetScreen()->GetCursorScreenPoint();
1055   if (shelf_region.Contains(cursor_position_in_screen))
1056     return SHELF_AUTO_HIDE_SHOWN;
1057
1058   // When the shelf is auto hidden and the shelf is on the boundary between two
1059   // displays, it is hard to trigger showing the shelf. For instance, if a
1060   // user's primary display is left of their secondary display, it is hard to
1061   // unautohide a left aligned shelf on the secondary display.
1062   // It is hard because:
1063   // - It is hard to stop the cursor in the shelf "light bar" and not overshoot.
1064   // - The cursor is warped to the other display if the cursor gets to the edge
1065   //   of the display.
1066   // Show the shelf if the cursor started on the shelf and the user overshot the
1067   // shelf slightly to make it easier to show the shelf in this situation. We
1068   // do not check |auto_hide_timer_|.IsRunning() because it returns false when
1069   // the timer's task is running.
1070   if ((state_.auto_hide_state == SHELF_AUTO_HIDE_SHOWN ||
1071        mouse_over_shelf_when_auto_hide_timer_started_) &&
1072       GetAutoHideShowShelfRegionInScreen().Contains(
1073           cursor_position_in_screen)) {
1074     return SHELF_AUTO_HIDE_SHOWN;
1075   }
1076
1077   return SHELF_AUTO_HIDE_HIDDEN;
1078 }
1079
1080 void ShelfLayoutManager::UpdateHitTestBounds() {
1081   gfx::Insets mouse_insets;
1082   gfx::Insets touch_insets;
1083   if (state_.visibility_state == SHELF_VISIBLE) {
1084     // Let clicks at the very top of the launcher through so windows can be
1085     // resized with the bottom-right corner and bottom edge.
1086     mouse_insets = GetInsetsForAlignment(kWorkspaceAreaVisibleInset);
1087   } else if (state_.visibility_state == SHELF_AUTO_HIDE) {
1088     // Extend the touch hit target out a bit to allow users to drag shelf out
1089     // while hidden.
1090     touch_insets = GetInsetsForAlignment(-kWorkspaceAreaAutoHideInset);
1091   }
1092
1093   if (shelf_ && shelf_->GetNativeWindow())
1094     shelf_->GetNativeWindow()->SetHitTestBoundsOverrideOuter(mouse_insets,
1095                                                              touch_insets);
1096   shelf_->status_area_widget()->GetNativeWindow()->
1097       SetHitTestBoundsOverrideOuter(mouse_insets, touch_insets);
1098 }
1099
1100 bool ShelfLayoutManager::IsShelfWindow(aura::Window* window) {
1101   if (!window)
1102     return false;
1103   return (shelf_ && shelf_->GetNativeWindow()->Contains(window)) ||
1104       (shelf_->status_area_widget() &&
1105        shelf_->status_area_widget()->GetNativeWindow()->Contains(window));
1106 }
1107
1108 int ShelfLayoutManager::GetWorkAreaSize(const State& state, int size) const {
1109   if (state.visibility_state == SHELF_VISIBLE)
1110     return size;
1111   if (state.visibility_state == SHELF_AUTO_HIDE)
1112     return kAutoHideSize;
1113   return 0;
1114 }
1115
1116 gfx::Rect ShelfLayoutManager::GetAvailableBounds() const {
1117   gfx::Rect bounds(root_window_->bounds());
1118   bounds.set_height(bounds.height() - keyboard_bounds_.height());
1119   return bounds;
1120 }
1121
1122 void ShelfLayoutManager::OnKeyboardBoundsChanging(
1123     const gfx::Rect& keyboard_bounds) {
1124   keyboard_bounds_ = keyboard_bounds;
1125   OnWindowResized();
1126 }
1127
1128 void ShelfLayoutManager::OnDockBoundsChanging(
1129     const gfx::Rect& dock_bounds,
1130     DockedWindowLayoutManagerObserver::Reason reason) {
1131   // Skip shelf layout in case docked notification originates from this class.
1132   if (reason == DISPLAY_INSETS_CHANGED)
1133     return;
1134   if (dock_bounds_ != dock_bounds) {
1135     dock_bounds_ = dock_bounds;
1136     OnWindowResized();
1137   }
1138 }
1139
1140 void ShelfLayoutManager::OnLockStateEvent(LockStateObserver::EventType event) {
1141   if (event == EVENT_LOCK_ANIMATION_STARTED) {
1142     // Hide the status area widget (using auto hide animation).
1143     base::AutoReset<ShelfVisibilityState> state(&state_.visibility_state,
1144                                                 SHELF_HIDDEN);
1145     TargetBounds target_bounds;
1146     CalculateTargetBounds(state_, &target_bounds);
1147     UpdateBoundsAndOpacity(target_bounds, true, NULL);
1148   }
1149 }
1150
1151 gfx::Insets ShelfLayoutManager::GetInsetsForAlignment(int distance) const {
1152   switch (GetAlignment()) {
1153     case SHELF_ALIGNMENT_BOTTOM:
1154       return gfx::Insets(distance, 0, 0, 0);
1155     case SHELF_ALIGNMENT_LEFT:
1156       return gfx::Insets(0, 0, 0, distance);
1157     case SHELF_ALIGNMENT_RIGHT:
1158       return gfx::Insets(0, distance, 0, 0);
1159     case SHELF_ALIGNMENT_TOP:
1160       return gfx::Insets(0, 0, distance, 0);
1161   }
1162   NOTREACHED();
1163   return gfx::Insets();
1164 }
1165
1166 }  // namespace internal
1167 }  // namespace ash