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/accelerators/accelerator_commands.h"
  14 #include "ash/ash_switches.h"
  15 #include "ash/root_window_controller.h"
  16 #include "ash/screen_util.h"
  17 #include "ash/session/session_state_delegate.h"
  18 #include "ash/shelf/shelf.h"
  19 #include "ash/shelf/shelf_bezel_event_filter.h"
  20 #include "ash/shelf/shelf_constants.h"
  21 #include "ash/shelf/shelf_layout_manager_observer.h"
  22 #include "ash/shelf/shelf_widget.h"
  23 #include "ash/shell.h"
  24 #include "ash/shell_window_ids.h"
  25 #include "ash/system/status_area_widget.h"
  26 #include "ash/wm/gestures/shelf_gesture_handler.h"
  27 #include "ash/wm/lock_state_controller.h"
  28 #include "ash/wm/mru_window_tracker.h"
  29 #include "ash/wm/window_animations.h"
  30 #include "ash/wm/window_state.h"
  31 #include "ash/wm/window_util.h"
  32 #include "ash/wm/workspace_controller.h"
  33 #include "base/auto_reset.h"
  34 #include "base/command_line.h"
  35 #include "base/command_line.h"
  36 #include "base/i18n/rtl.h"
  37 #include "base/strings/string_number_conversions.h"
  38 #include "base/strings/string_util.h"
  39 #include "ui/aura/client/cursor_client.h"
  40 #include "ui/aura/window_event_dispatcher.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/keyboard/keyboard_util.h"
  50 #include "ui/views/widget/widget.h"
  51 #include "ui/wm/public/activation_client.h"
  52
  53 namespace ash {
  54 namespace {
  55
  56 // Delay before showing the shelf. 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 }  // namespace
  81
  82 // static
  83 const int ShelfLayoutManager::kWorkspaceAreaVisibleInset = 2;
  84
  85 // static
  86 const int ShelfLayoutManager::kWorkspaceAreaAutoHideInset = 5;
  87
  88 // static
  89 const int ShelfLayoutManager::kAutoHideSize = 3;
  90
  91 // static
  92 const int ShelfLayoutManager::kShelfItemInset = 3;
  93
  94 // ShelfLayoutManager::AutoHideEventFilter -------------------------------------
  95
  96 // Notifies ShelfLayoutManager any time the mouse moves.
  97 class ShelfLayoutManager::AutoHideEventFilter : public ui::EventHandler {
  98  public:
  99   explicit AutoHideEventFilter(ShelfLayoutManager* shelf);
 100   ~AutoHideEventFilter() override;
 101
 102   // Returns true if the last mouse event was a mouse drag.
 103   bool in_mouse_drag() const { return in_mouse_drag_; }
 104
 105   // Overridden from ui::EventHandler:
 106   void OnMouseEvent(ui::MouseEvent* event) override;
 107   void OnGestureEvent(ui::GestureEvent* event) override;
 108
 109  private:
 110   ShelfLayoutManager* shelf_;
 111   bool in_mouse_drag_;
 112   ShelfGestureHandler gesture_handler_;
 113   DISALLOW_COPY_AND_ASSIGN(AutoHideEventFilter);
 114 };
 115
 116 ShelfLayoutManager::AutoHideEventFilter::AutoHideEventFilter(
 117     ShelfLayoutManager* shelf)
 118     : shelf_(shelf),
 119       in_mouse_drag_(false) {
 120   Shell::GetInstance()->AddPreTargetHandler(this);
 121 }
 122
 123 ShelfLayoutManager::AutoHideEventFilter::~AutoHideEventFilter() {
 124   Shell::GetInstance()->RemovePreTargetHandler(this);
 125 }
 126
 127 void ShelfLayoutManager::AutoHideEventFilter::OnMouseEvent(
 128     ui::MouseEvent* event) {
 129   // This also checks IsShelfWindow() to make sure we don't attempt to hide the
 130   // shelf if the mouse down occurs on the shelf.
 131   in_mouse_drag_ = (event->type() == ui::ET_MOUSE_DRAGGED ||
 132                     (in_mouse_drag_ && event->type() != ui::ET_MOUSE_RELEASED &&
 133                      event->type() != ui::ET_MOUSE_CAPTURE_CHANGED)) &&
 134       !shelf_->IsShelfWindow(static_cast<aura::Window*>(event->target()));
 135   if (event->type() == ui::ET_MOUSE_MOVED)
 136     shelf_->UpdateAutoHideState();
 137   return;
 138 }
 139
 140 void ShelfLayoutManager::AutoHideEventFilter::OnGestureEvent(
 141     ui::GestureEvent* event) {
 142   if (shelf_->IsShelfWindow(static_cast<aura::Window*>(event->target()))) {
 143     if (gesture_handler_.ProcessGestureEvent(*event))
 144       event->StopPropagation();
 145   }
 146 }
 147
 148 // ShelfLayoutManager:UpdateShelfObserver --------------------------------------
 149
 150 // UpdateShelfObserver is used to delay updating the background until the
 151 // animation completes.
 152 class ShelfLayoutManager::UpdateShelfObserver
 153     : public ui::ImplicitAnimationObserver {
 154  public:
 155   explicit UpdateShelfObserver(ShelfLayoutManager* shelf) : shelf_(shelf) {
 156     shelf_->update_shelf_observer_ = this;
 157   }
 158
 159   void Detach() {
 160     shelf_ = NULL;
 161   }
 162
 163   void OnImplicitAnimationsCompleted() override {
 164     if (shelf_)
 165       shelf_->UpdateShelfBackground(BACKGROUND_CHANGE_ANIMATE);
 166     delete this;
 167   }
 168
 169  private:
 170   ~UpdateShelfObserver() override {
 171     if (shelf_)
 172       shelf_->update_shelf_observer_ = NULL;
 173   }
 174
 175   // Shelf we're in. NULL if deleted before we're deleted.
 176   ShelfLayoutManager* shelf_;
 177
 178   DISALLOW_COPY_AND_ASSIGN(UpdateShelfObserver);
 179 };
 180
 181 // ShelfLayoutManager ----------------------------------------------------------
 182
 183 ShelfLayoutManager::ShelfLayoutManager(ShelfWidget* shelf)
 184     : SnapToPixelLayoutManager(shelf->GetNativeView()->parent()),
 185       root_window_(shelf->GetNativeView()->GetRootWindow()),
 186       updating_bounds_(false),
 187       auto_hide_behavior_(SHELF_AUTO_HIDE_BEHAVIOR_NEVER),
 188       alignment_(SHELF_ALIGNMENT_BOTTOM),
 189       shelf_(shelf),
 190       workspace_controller_(NULL),
 191       window_overlaps_shelf_(false),
 192       mouse_over_shelf_when_auto_hide_timer_started_(false),
 193       bezel_event_filter_(new ShelfBezelEventFilter(this)),
 194       gesture_drag_status_(GESTURE_DRAG_NONE),
 195       gesture_drag_amount_(0.f),
 196       gesture_drag_auto_hide_state_(SHELF_AUTO_HIDE_SHOWN),
 197       update_shelf_observer_(NULL),
 198       duration_override_in_ms_(0) {
 199   Shell::GetInstance()->AddShellObserver(this);
 200   Shell::GetInstance()->lock_state_controller()->AddObserver(this);
 201   aura::client::GetActivationClient(root_window_)->AddObserver(this);
 202   Shell::GetInstance()->session_state_delegate()->AddSessionStateObserver(this);
 203 }
 204
 205 ShelfLayoutManager::~ShelfLayoutManager() {
 206   if (update_shelf_observer_)
 207     update_shelf_observer_->Detach();
 208
 209   FOR_EACH_OBSERVER(ShelfLayoutManagerObserver, observers_, WillDeleteShelf());
 210   Shell::GetInstance()->RemoveShellObserver(this);
 211   Shell::GetInstance()->lock_state_controller()->RemoveObserver(this);
 212   Shell::GetInstance()->
 213       session_state_delegate()->RemoveSessionStateObserver(this);
 214 }
 215
 216 void ShelfLayoutManager::SetAutoHideBehavior(ShelfAutoHideBehavior behavior) {
 217   if (auto_hide_behavior_ == behavior)
 218     return;
 219   auto_hide_behavior_ = behavior;
 220   UpdateVisibilityState();
 221   FOR_EACH_OBSERVER(ShelfLayoutManagerObserver, observers_,
 222                     OnAutoHideBehaviorChanged(root_window_,
 223                                               auto_hide_behavior_));
 224 }
 225
 226 void ShelfLayoutManager::PrepareForShutdown() {
 227   // Clear all event filters, otherwise sometimes those filters may catch
 228   // synthesized mouse event and cause crashes during the shutdown.
 229   set_workspace_controller(NULL);
 230   auto_hide_event_filter_.reset();
 231   bezel_event_filter_.reset();
 232   // Stop observing window change, otherwise we can attempt to update a
 233   // partially destructed shelf.
 234   aura::client::GetActivationClient(root_window_)->RemoveObserver(this);
 235 }
 236
 237 bool ShelfLayoutManager::IsVisible() const {
 238   // status_area_widget() may be NULL during the shutdown.
 239   return shelf_->status_area_widget() &&
 240       shelf_->status_area_widget()->IsVisible() &&
 241       (state_.visibility_state == SHELF_VISIBLE ||
 242        (state_.visibility_state == SHELF_AUTO_HIDE &&
 243         state_.auto_hide_state == SHELF_AUTO_HIDE_SHOWN));
 244 }
 245
 246 bool ShelfLayoutManager::SetAlignment(ShelfAlignment alignment) {
 247   if (alignment_ == alignment)
 248     return false;
 249
 250   alignment_ = alignment;
 251   // The shelf will itself move to the bottom while locked or obscured by user
 252   // login. If a request is sent to move while being obscured, we postpone the
 253   // move until the user session is resumed.
 254   if (IsAlignmentLocked())
 255     return false;
 256
 257   // This should not be called during the lock screen transitions.
 258   shelf_->SetAlignment(alignment);
 259   LayoutShelf();
 260   return true;
 261 }
 262
 263 ShelfAlignment ShelfLayoutManager::GetAlignment() const {
 264   // When the screen is locked or a user gets added, the shelf is forced into
 265   // bottom alignment.
 266   if (IsAlignmentLocked())
 267     return SHELF_ALIGNMENT_BOTTOM;
 268   return alignment_;
 269 }
 270
 271 gfx::Rect ShelfLayoutManager::GetIdealBounds() {
 272   gfx::Rect bounds(
 273       ScreenUtil::GetDisplayBoundsInParent(shelf_->GetNativeView()));
 274   int width = 0, height = 0;
 275   GetShelfSize(&width, &height);
 276   return SelectValueForShelfAlignment(
 277       gfx::Rect(bounds.x(), bounds.bottom() - height, bounds.width(), height),
 278       gfx::Rect(bounds.x(), bounds.y(), width, bounds.height()),
 279       gfx::Rect(bounds.right() - width, bounds.y(), width, bounds.height()),
 280       gfx::Rect(bounds.x(), bounds.y(), bounds.width(), height));
 281 }
 282
 283 void ShelfLayoutManager::LayoutShelf() {
 284   TargetBounds target_bounds;
 285   CalculateTargetBounds(state_, &target_bounds);
 286   UpdateBoundsAndOpacity(target_bounds, false, NULL);
 287
 288   if (shelf_->shelf()) {
 289     // This is not part of UpdateBoundsAndOpacity() because
 290     // SetShelfViewBounds() sets the bounds immediately and does not animate.
 291     // The height of the ShelfView for a horizontal shelf and the width of
 292     // the ShelfView for a vertical shelf are set when |shelf_|'s bounds
 293     // are changed via UpdateBoundsAndOpacity(). This sets the origin and the
 294     // dimension in the other direction.
 295     shelf_->shelf()->SetShelfViewBounds(
 296         target_bounds.shelf_bounds_in_shelf);
 297   }
 298 }
 299
 300 ShelfVisibilityState ShelfLayoutManager::CalculateShelfVisibility() {
 301   switch(auto_hide_behavior_) {
 302     case SHELF_AUTO_HIDE_BEHAVIOR_ALWAYS:
 303       return SHELF_AUTO_HIDE;
 304     case SHELF_AUTO_HIDE_BEHAVIOR_NEVER:
 305       return SHELF_VISIBLE;
 306     case SHELF_AUTO_HIDE_ALWAYS_HIDDEN:
 307       return SHELF_HIDDEN;
 308   }
 309   return SHELF_VISIBLE;
 310 }
 311
 312 void ShelfLayoutManager::UpdateVisibilityState() {
 313   // Bail out early when there is no |workspace_controller_|, which happens
 314   // during shutdown after PrepareForShutdown.
 315   if (!workspace_controller_)
 316     return;
 317
 318   if (state_.is_screen_locked || state_.is_adding_user_screen) {
 319     SetState(SHELF_VISIBLE);
 320   } else {
 321     // TODO(zelidrag): Verify shelf drag animation still shows on the device
 322     // when we are in SHELF_AUTO_HIDE_ALWAYS_HIDDEN.
 323     WorkspaceWindowState window_state(workspace_controller_->GetWindowState());
 324     switch (window_state) {
 325       case WORKSPACE_WINDOW_STATE_FULL_SCREEN: {
 326         const aura::Window* fullscreen_window = GetRootWindowController(
 327             root_window_)->GetWindowForFullscreenMode();
 328         if (fullscreen_window && wm::GetWindowState(fullscreen_window)->
 329                 hide_shelf_when_fullscreen()) {
 330           SetState(SHELF_HIDDEN);
 331         } else {
 332           // The shelf is sometimes not hidden when in immersive fullscreen.
 333           // Force the shelf to be auto hidden in this case.
 334           SetState(SHELF_AUTO_HIDE);
 335         }
 336         break;
 337       }
 338
 339       case WORKSPACE_WINDOW_STATE_MAXIMIZED:
 340         SetState(CalculateShelfVisibility());
 341         break;
 342
 343       case WORKSPACE_WINDOW_STATE_WINDOW_OVERLAPS_SHELF:
 344       case WORKSPACE_WINDOW_STATE_DEFAULT:
 345         SetState(CalculateShelfVisibility());
 346         SetWindowOverlapsShelf(window_state ==
 347                                WORKSPACE_WINDOW_STATE_WINDOW_OVERLAPS_SHELF);
 348         break;
 349     }
 350   }
 351 }
 352
 353 void ShelfLayoutManager::UpdateAutoHideState() {
 354   ShelfAutoHideState auto_hide_state =
 355       CalculateAutoHideState(state_.visibility_state);
 356   if (auto_hide_state != state_.auto_hide_state) {
 357     if (auto_hide_state == SHELF_AUTO_HIDE_HIDDEN) {
 358       // Hides happen immediately.
 359       SetState(state_.visibility_state);
 360     } else {
 361       if (!auto_hide_timer_.IsRunning()) {
 362         mouse_over_shelf_when_auto_hide_timer_started_ =
 363             shelf_->GetWindowBoundsInScreen().Contains(
 364                 Shell::GetScreen()->GetCursorScreenPoint());
 365       }
 366       auto_hide_timer_.Start(
 367           FROM_HERE,
 368           base::TimeDelta::FromMilliseconds(kAutoHideDelayMS),
 369           this, &ShelfLayoutManager::UpdateAutoHideStateNow);
 370     }
 371   } else {
 372     StopAutoHideTimer();
 373   }
 374 }
 375
 376 void ShelfLayoutManager::SetWindowOverlapsShelf(bool value) {
 377   window_overlaps_shelf_ = value;
 378   UpdateShelfBackground(BACKGROUND_CHANGE_ANIMATE);
 379 }
 380
 381 void ShelfLayoutManager::AddObserver(ShelfLayoutManagerObserver* observer) {
 382   observers_.AddObserver(observer);
 383 }
 384
 385 void ShelfLayoutManager::RemoveObserver(ShelfLayoutManagerObserver* observer) {
 386   observers_.RemoveObserver(observer);
 387 }
 388
 389 ////////////////////////////////////////////////////////////////////////////////
 390 // ShelfLayoutManager, Gesture functions:
 391
 392 void ShelfLayoutManager::OnGestureEdgeSwipe(const ui::GestureEvent& gesture) {
 393   if (visibility_state() == SHELF_AUTO_HIDE) {
 394     gesture_drag_auto_hide_state_ = SHELF_AUTO_HIDE_SHOWN;
 395     gesture_drag_status_ = GESTURE_DRAG_COMPLETE_IN_PROGRESS;
 396     UpdateVisibilityState();
 397     gesture_drag_status_ = GESTURE_DRAG_NONE;
 398   }
 399 }
 400
 401 void ShelfLayoutManager::StartGestureDrag(const ui::GestureEvent& gesture) {
 402   gesture_drag_status_ = GESTURE_DRAG_IN_PROGRESS;
 403   gesture_drag_amount_ = 0.f;
 404   gesture_drag_auto_hide_state_ = visibility_state() == SHELF_AUTO_HIDE ?
 405       auto_hide_state() : SHELF_AUTO_HIDE_SHOWN;
 406   UpdateShelfBackground(BACKGROUND_CHANGE_ANIMATE);
 407 }
 408
 409 void ShelfLayoutManager::UpdateGestureDrag(
 410     const ui::GestureEvent& gesture) {
 411   bool horizontal = IsHorizontalAlignment();
 412   gesture_drag_amount_ += horizontal ? gesture.details().scroll_y() :
 413                                        gesture.details().scroll_x();
 414   LayoutShelf();
 415 }
 416
 417 void ShelfLayoutManager::CompleteGestureDrag(const ui::GestureEvent& gesture) {
 418   bool horizontal = IsHorizontalAlignment();
 419   bool should_change = false;
 420   if (gesture.type() == ui::ET_GESTURE_SCROLL_END) {
 421     // The visibility of the shelf changes only if the shelf was dragged X%
 422     // along the correct axis. If the shelf was already visible, then the
 423     // direction of the drag does not matter.
 424     const float kDragHideThreshold = 0.4f;
 425     gfx::Rect bounds = GetIdealBounds();
 426     float drag_ratio = fabs(gesture_drag_amount_) /
 427                        (horizontal ?  bounds.height() : bounds.width());
 428     if (gesture_drag_auto_hide_state_ == SHELF_AUTO_HIDE_SHOWN) {
 429       should_change = drag_ratio > kDragHideThreshold;
 430     } else {
 431       bool correct_direction = false;
 432       switch (GetAlignment()) {
 433         case SHELF_ALIGNMENT_BOTTOM:
 434         case SHELF_ALIGNMENT_RIGHT:
 435           correct_direction = gesture_drag_amount_ < 0;
 436           break;
 437         case SHELF_ALIGNMENT_LEFT:
 438         case SHELF_ALIGNMENT_TOP:
 439           correct_direction = gesture_drag_amount_ > 0;
 440           break;
 441       }
 442       should_change = correct_direction && drag_ratio > kDragHideThreshold;
 443     }
 444   } else if (gesture.type() == ui::ET_SCROLL_FLING_START) {
 445     if (gesture_drag_auto_hide_state_ == SHELF_AUTO_HIDE_SHOWN) {
 446       should_change = horizontal ? fabs(gesture.details().velocity_y()) > 0 :
 447                                    fabs(gesture.details().velocity_x()) > 0;
 448     } else {
 449       should_change = SelectValueForShelfAlignment(
 450           gesture.details().velocity_y() < 0,
 451           gesture.details().velocity_x() > 0,
 452           gesture.details().velocity_x() < 0,
 453           gesture.details().velocity_y() > 0);
 454     }
 455   } else {
 456     NOTREACHED();
 457   }
 458
 459   if (!should_change) {
 460     CancelGestureDrag();
 461     return;
 462   }
 463   if (shelf_) {
 464     shelf_->Deactivate();
 465     shelf_->status_area_widget()->Deactivate();
 466   }
 467   gesture_drag_auto_hide_state_ =
 468       gesture_drag_auto_hide_state_ == SHELF_AUTO_HIDE_SHOWN ?
 469       SHELF_AUTO_HIDE_HIDDEN : SHELF_AUTO_HIDE_SHOWN;
 470   ShelfAutoHideBehavior new_auto_hide_behavior =
 471       gesture_drag_auto_hide_state_ == SHELF_AUTO_HIDE_SHOWN ?
 472       SHELF_AUTO_HIDE_BEHAVIOR_NEVER : SHELF_AUTO_HIDE_BEHAVIOR_ALWAYS;
 473
 474   // When in fullscreen and the shelf is forced to be auto hidden, the auto hide
 475   // behavior affects neither the visibility state nor the auto hide state. Set
 476   // |gesture_drag_status_| to GESTURE_DRAG_COMPLETE_IN_PROGRESS to set the auto
 477   // hide state to |gesture_drag_auto_hide_state_|.
 478   gesture_drag_status_ = GESTURE_DRAG_COMPLETE_IN_PROGRESS;
 479   if (auto_hide_behavior_ != new_auto_hide_behavior)
 480     SetAutoHideBehavior(new_auto_hide_behavior);
 481   else
 482     UpdateVisibilityState();
 483   gesture_drag_status_ = GESTURE_DRAG_NONE;
 484 }
 485
 486 void ShelfLayoutManager::CancelGestureDrag() {
 487   gesture_drag_status_ = GESTURE_DRAG_CANCEL_IN_PROGRESS;
 488   UpdateVisibilityState();
 489   gesture_drag_status_ = GESTURE_DRAG_NONE;
 490 }
 491
 492 void ShelfLayoutManager::SetAnimationDurationOverride(
 493     int duration_override_in_ms) {
 494   duration_override_in_ms_ = duration_override_in_ms;
 495 }
 496
 497 ////////////////////////////////////////////////////////////////////////////////
 498 // ShelfLayoutManager, aura::LayoutManager implementation:
 499
 500 void ShelfLayoutManager::OnWindowResized() {
 501   LayoutShelf();
 502 }
 503
 504 void ShelfLayoutManager::SetChildBounds(aura::Window* child,
 505                                         const gfx::Rect& requested_bounds) {
 506   SnapToPixelLayoutManager::SetChildBounds(child, requested_bounds);
 507   // We may contain other widgets (such as frame maximize bubble) but they don't
 508   // effect the layout in anyway.
 509   if (!updating_bounds_ &&
 510       ((shelf_->GetNativeView() == child) ||
 511        (shelf_->status_area_widget()->GetNativeView() == child))) {
 512     LayoutShelf();
 513   }
 514 }
 515
 516 void ShelfLayoutManager::OnLockStateChanged(bool locked) {
 517   // Force the shelf to layout for alignment (bottom if locked, restore
 518   // the previous alignment otherwise).
 519   state_.is_screen_locked = locked;
 520   UpdateShelfVisibilityAfterLoginUIChange();
 521 }
 522
 523 void ShelfLayoutManager::OnWindowActivated(aura::Window* gained_active,
 524                                            aura::Window* lost_active) {
 525   UpdateAutoHideStateNow();
 526 }
 527
 528 bool ShelfLayoutManager::IsHorizontalAlignment() const {
 529   return GetAlignment() == SHELF_ALIGNMENT_BOTTOM ||
 530          GetAlignment() == SHELF_ALIGNMENT_TOP;
 531 }
 532
 533 // static
 534 ShelfLayoutManager* ShelfLayoutManager::ForShelf(aura::Window* window) {
 535   ShelfWidget* shelf = RootWindowController::ForShelf(window)->shelf();
 536   return shelf ? shelf->shelf_layout_manager() : NULL;
 537 }
 538
 539 ////////////////////////////////////////////////////////////////////////////////
 540 // ShelfLayoutManager, private:
 541
 542 ShelfLayoutManager::TargetBounds::TargetBounds() : opacity(0.0f) {}
 543 ShelfLayoutManager::TargetBounds::~TargetBounds() {}
 544
 545 void ShelfLayoutManager::SetState(ShelfVisibilityState visibility_state) {
 546   if (!shelf_->GetNativeView())
 547     return;
 548
 549   State state;
 550   state.visibility_state = visibility_state;
 551   state.auto_hide_state = CalculateAutoHideState(visibility_state);
 552   state.window_state = workspace_controller_ ?
 553       workspace_controller_->GetWindowState() : WORKSPACE_WINDOW_STATE_DEFAULT;
 554   // Preserve the log in screen states.
 555   state.is_adding_user_screen = state_.is_adding_user_screen;
 556   state.is_screen_locked = state_.is_screen_locked;
 557
 558   // Force an update because gesture drags affect the shelf bounds and we
 559   // should animate back to the normal bounds at the end of a gesture.
 560   bool force_update =
 561       (gesture_drag_status_ == GESTURE_DRAG_CANCEL_IN_PROGRESS ||
 562        gesture_drag_status_ == GESTURE_DRAG_COMPLETE_IN_PROGRESS);
 563
 564   if (!force_update && state_.Equals(state))
 565     return;  // Nothing changed.
 566
 567   FOR_EACH_OBSERVER(ShelfLayoutManagerObserver, observers_,
 568                     WillChangeVisibilityState(visibility_state));
 569
 570   if (state.visibility_state == SHELF_AUTO_HIDE) {
 571     // When state is SHELF_AUTO_HIDE we need to track when the mouse is over the
 572     // shelf to unhide it. AutoHideEventFilter does that for us.
 573     if (!auto_hide_event_filter_)
 574       auto_hide_event_filter_.reset(new AutoHideEventFilter(this));
 575   } else {
 576     auto_hide_event_filter_.reset(NULL);
 577   }
 578
 579   StopAutoHideTimer();
 580
 581   State old_state = state_;
 582   state_ = state;
 583
 584   BackgroundAnimatorChangeType change_type = BACKGROUND_CHANGE_ANIMATE;
 585   bool delay_background_change = false;
 586
 587   // Do not animate the background when:
 588   // - Going from a hidden / auto hidden shelf in fullscreen to a visible shelf
 589   //   in maximized mode.
 590   // - Going from an auto hidden shelf in maximized mode to a visible shelf in
 591   //   maximized mode.
 592   if (state.visibility_state == SHELF_VISIBLE &&
 593       state.window_state == WORKSPACE_WINDOW_STATE_MAXIMIZED &&
 594       old_state.visibility_state != SHELF_VISIBLE) {
 595     change_type = BACKGROUND_CHANGE_IMMEDIATE;
 596   } else {
 597     // Delay the animation when the shelf was hidden, and has just been made
 598     // visible (e.g. using a gesture-drag).
 599     if (state.visibility_state == SHELF_VISIBLE &&
 600         old_state.visibility_state == SHELF_AUTO_HIDE &&
 601         old_state.auto_hide_state == SHELF_AUTO_HIDE_HIDDEN) {
 602       delay_background_change = true;
 603     }
 604   }
 605
 606   if (delay_background_change) {
 607     if (update_shelf_observer_)
 608       update_shelf_observer_->Detach();
 609     // UpdateShelfBackground deletes itself when the animation is done.
 610     update_shelf_observer_ = new UpdateShelfObserver(this);
 611   } else {
 612     UpdateShelfBackground(change_type);
 613   }
 614
 615   shelf_->SetDimsShelf(
 616       state.visibility_state == SHELF_VISIBLE &&
 617       state.window_state == WORKSPACE_WINDOW_STATE_MAXIMIZED);
 618
 619   TargetBounds target_bounds;
 620   CalculateTargetBounds(state_, &target_bounds);
 621   UpdateBoundsAndOpacity(target_bounds, true,
 622       delay_background_change ? update_shelf_observer_ : NULL);
 623
 624   // OnAutoHideStateChanged Should be emitted when:
 625   //  - firstly state changed to auto-hide from other state
 626   //  - or, auto_hide_state has changed
 627   if ((old_state.visibility_state != state_.visibility_state &&
 628        state_.visibility_state == SHELF_AUTO_HIDE) ||
 629       old_state.auto_hide_state != state_.auto_hide_state) {
 630     FOR_EACH_OBSERVER(ShelfLayoutManagerObserver, observers_,
 631                       OnAutoHideStateChanged(state_.auto_hide_state));
 632   }
 633 }
 634
 635 void ShelfLayoutManager::UpdateBoundsAndOpacity(
 636     const TargetBounds& target_bounds,
 637     bool animate,
 638     ui::ImplicitAnimationObserver* observer) {
 639   base::AutoReset<bool> auto_reset_updating_bounds(&updating_bounds_, true);
 640   {
 641     ui::ScopedLayerAnimationSettings shelf_animation_setter(
 642         GetLayer(shelf_)->GetAnimator());
 643     ui::ScopedLayerAnimationSettings status_animation_setter(
 644         GetLayer(shelf_->status_area_widget())->GetAnimator());
 645     if (animate) {
 646       int duration = duration_override_in_ms_ ? duration_override_in_ms_ :
 647                                                 kCrossFadeDurationMS;
 648       shelf_animation_setter.SetTransitionDuration(
 649           base::TimeDelta::FromMilliseconds(duration));
 650       shelf_animation_setter.SetTweenType(gfx::Tween::EASE_OUT);
 651       shelf_animation_setter.SetPreemptionStrategy(
 652           ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
 653       status_animation_setter.SetTransitionDuration(
 654           base::TimeDelta::FromMilliseconds(duration));
 655       status_animation_setter.SetTweenType(gfx::Tween::EASE_OUT);
 656       status_animation_setter.SetPreemptionStrategy(
 657           ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
 658     } else {
 659       StopAnimating();
 660       shelf_animation_setter.SetTransitionDuration(base::TimeDelta());
 661       status_animation_setter.SetTransitionDuration(base::TimeDelta());
 662     }
 663     if (observer)
 664       status_animation_setter.AddObserver(observer);
 665
 666     GetLayer(shelf_)->SetOpacity(target_bounds.opacity);
 667     shelf_->SetBounds(ScreenUtil::ConvertRectToScreen(
 668         shelf_->GetNativeView()->parent(),
 669         target_bounds.shelf_bounds_in_root));
 670
 671     GetLayer(shelf_->status_area_widget())->SetOpacity(
 672         target_bounds.status_opacity);
 673
 674     // Having a window which is visible but does not have an opacity is an
 675     // illegal state. We therefore hide the shelf here if required.
 676     if (!target_bounds.status_opacity)
 677       shelf_->status_area_widget()->Hide();
 678     // Setting visibility during an animation causes the visibility property to
 679     // animate. Override the animation settings to immediately set the
 680     // visibility property. Opacity will still animate.
 681
 682     // TODO(harrym): Once status area widget is a child view of shelf
 683     // this can be simplified.
 684     gfx::Rect status_bounds = target_bounds.status_bounds_in_shelf;
 685     status_bounds.set_x(status_bounds.x() +
 686                         target_bounds.shelf_bounds_in_root.x());
 687     status_bounds.set_y(status_bounds.y() +
 688                         target_bounds.shelf_bounds_in_root.y());
 689     shelf_->status_area_widget()->SetBounds(
 690         ScreenUtil::ConvertRectToScreen(
 691             shelf_->status_area_widget()->GetNativeView()->parent(),
 692             status_bounds));
 693     if (!state_.is_screen_locked) {
 694       gfx::Insets insets;
 695       // If user session is blocked (login to new user session or add user to
 696       // the existing session - multi-profile) then give 100% of work area only
 697       // if keyboard is not shown.
 698       if (!state_.is_adding_user_screen || !keyboard_bounds_.IsEmpty()) {
 699         insets = target_bounds.work_area_insets;
 700       }
 701       Shell::GetInstance()->SetDisplayWorkAreaInsets(root_window_, insets);
 702     }
 703   }
 704
 705   // Setting visibility during an animation causes the visibility property to
 706   // animate. Set the visibility property without an animation.
 707   if (target_bounds.status_opacity)
 708     shelf_->status_area_widget()->Show();
 709 }
 710
 711 void ShelfLayoutManager::StopAnimating() {
 712   GetLayer(shelf_)->GetAnimator()->StopAnimating();
 713   GetLayer(shelf_->status_area_widget())->GetAnimator()->StopAnimating();
 714 }
 715
 716 void ShelfLayoutManager::GetShelfSize(int* width, int* height) {
 717   *width = *height = 0;
 718   gfx::Size status_size(
 719       shelf_->status_area_widget()->GetWindowBoundsInScreen().size());
 720   if (IsHorizontalAlignment())
 721     *height = kShelfSize;
 722   else
 723     *width = kShelfSize;
 724 }
 725
 726 void ShelfLayoutManager::AdjustBoundsBasedOnAlignment(int inset,
 727                                                       gfx::Rect* bounds) const {
 728   bounds->Inset(SelectValueForShelfAlignment(
 729       gfx::Insets(0, 0, inset, 0),
 730       gfx::Insets(0, inset, 0, 0),
 731       gfx::Insets(0, 0, 0, inset),
 732       gfx::Insets(inset, 0, 0, 0)));
 733 }
 734
 735 void ShelfLayoutManager::CalculateTargetBounds(
 736     const State& state,
 737     TargetBounds* target_bounds) {
 738   const gfx::Rect available_bounds(root_window_->bounds());
 739   gfx::Rect status_size(
 740       shelf_->status_area_widget()->GetWindowBoundsInScreen().size());
 741   int shelf_width = 0, shelf_height = 0;
 742   GetShelfSize(&shelf_width, &shelf_height);
 743   if (IsHorizontalAlignment())
 744     shelf_width = available_bounds.width();
 745   else
 746     shelf_height = available_bounds.height();
 747
 748   if (state.visibility_state == SHELF_AUTO_HIDE &&
 749       state.auto_hide_state == SHELF_AUTO_HIDE_HIDDEN) {
 750     // Auto-hidden shelf always starts with the default size. If a gesture-drag
 751     // is in progress, then the call to UpdateTargetBoundsForGesture() below
 752     // takes care of setting the height properly.
 753     if (IsHorizontalAlignment())
 754       shelf_height = kAutoHideSize;
 755     else
 756       shelf_width = kAutoHideSize;
 757   } else if (state.visibility_state == SHELF_HIDDEN ||
 758       (!keyboard_bounds_.IsEmpty() && !keyboard::IsKeyboardOverscrollEnabled()))
 759   {
 760     if (IsHorizontalAlignment())
 761       shelf_height = 0;
 762     else
 763       shelf_width = 0;
 764   }
 765
 766   int bottom_shelf_vertical_offset = available_bounds.bottom();
 767   if (keyboard_bounds_.IsEmpty())
 768     bottom_shelf_vertical_offset -= shelf_height;
 769   else
 770     bottom_shelf_vertical_offset -= keyboard_bounds_.height();
 771
 772   target_bounds->shelf_bounds_in_root = SelectValueForShelfAlignment(
 773       gfx::Rect(available_bounds.x(), bottom_shelf_vertical_offset,
 774                     available_bounds.width(), shelf_height),
 775       gfx::Rect(available_bounds.x(), available_bounds.y(),
 776                     shelf_width, available_bounds.height()),
 777       gfx::Rect(available_bounds.right() - shelf_width, available_bounds.y(),
 778                     shelf_width, available_bounds.height()),
 779       gfx::Rect(available_bounds.x(), available_bounds.y(),
 780                     available_bounds.width(), shelf_height));
 781
 782   if (IsHorizontalAlignment())
 783     status_size.set_height(kShelfSize);
 784   else
 785     status_size.set_width(kShelfSize);
 786
 787   target_bounds->status_bounds_in_shelf = SelectValueForShelfAlignment(
 788       gfx::Rect(base::i18n::IsRTL() ? 0 : shelf_width - status_size.width(),
 789                     0, status_size.width(), status_size.height()),
 790       gfx::Rect(shelf_width - status_size.width(),
 791                     shelf_height - status_size.height(), status_size.width(),
 792                     status_size.height()),
 793       gfx::Rect(0, shelf_height - status_size.height(),
 794                     status_size.width(), status_size.height()),
 795       gfx::Rect(base::i18n::IsRTL() ? 0 : shelf_width - status_size.width(),
 796                     shelf_height - status_size.height(),
 797                     status_size.width(), status_size.height()));
 798
 799   target_bounds->work_area_insets = SelectValueForShelfAlignment(
 800       gfx::Insets(0, 0, GetWorkAreaSize(state, shelf_height), 0),
 801       gfx::Insets(0, GetWorkAreaSize(state, shelf_width), 0, 0),
 802       gfx::Insets(0, 0, 0, GetWorkAreaSize(state, shelf_width)),
 803       gfx::Insets(GetWorkAreaSize(state, shelf_height), 0, 0, 0));
 804
 805   // TODO(varkha): The functionality of managing insets for display areas
 806   // should probably be pushed to a separate component. This would simplify or
 807   // remove entirely the dependency on keyboard and dock.
 808
 809   if (!keyboard_bounds_.IsEmpty() && !keyboard::IsKeyboardOverscrollEnabled()) {
 810     // Also push in the work area inset for the keyboard if it is visible.
 811     gfx::Insets keyboard_insets(0, 0, keyboard_bounds_.height(), 0);
 812     target_bounds->work_area_insets += keyboard_insets;
 813   }
 814
 815   // Also push in the work area inset for the dock if it is visible.
 816   if (!dock_bounds_.IsEmpty()) {
 817     gfx::Insets dock_insets(
 818         0, (dock_bounds_.x() > 0 ? 0 : dock_bounds_.width()),
 819         0, (dock_bounds_.x() > 0 ? dock_bounds_.width() : 0));
 820     target_bounds->work_area_insets += dock_insets;
 821   }
 822
 823   target_bounds->opacity =
 824       (gesture_drag_status_ == GESTURE_DRAG_IN_PROGRESS ||
 825        state.visibility_state == SHELF_VISIBLE ||
 826        state.visibility_state == SHELF_AUTO_HIDE) ? 1.0f : 0.0f;
 827   target_bounds->status_opacity =
 828       (state.visibility_state == SHELF_AUTO_HIDE &&
 829        state.auto_hide_state == SHELF_AUTO_HIDE_HIDDEN &&
 830        gesture_drag_status_ != GESTURE_DRAG_IN_PROGRESS) ?
 831       0.0f : target_bounds->opacity;
 832
 833   if (gesture_drag_status_ == GESTURE_DRAG_IN_PROGRESS)
 834     UpdateTargetBoundsForGesture(target_bounds);
 835
 836   // This needs to happen after calling UpdateTargetBoundsForGesture(), because
 837   // that can change the size of the shelf.
 838   target_bounds->shelf_bounds_in_shelf = SelectValueForShelfAlignment(
 839       gfx::Rect(0, 0,
 840                 shelf_width - status_size.width(),
 841                 target_bounds->shelf_bounds_in_root.height()),
 842       gfx::Rect(0, 0, target_bounds->shelf_bounds_in_root.width(),
 843                 shelf_height - status_size.height()),
 844       gfx::Rect(0, 0, target_bounds->shelf_bounds_in_root.width(),
 845                 shelf_height - status_size.height()),
 846       gfx::Rect(0, 0,
 847                 shelf_width - status_size.width(),
 848                 target_bounds->shelf_bounds_in_root.height()));
 849 }
 850
 851 void ShelfLayoutManager::UpdateTargetBoundsForGesture(
 852     TargetBounds* target_bounds) const {
 853   CHECK_EQ(GESTURE_DRAG_IN_PROGRESS, gesture_drag_status_);
 854   bool horizontal = IsHorizontalAlignment();
 855   const gfx::Rect& available_bounds(root_window_->bounds());
 856   int resistance_free_region = 0;
 857
 858   if (gesture_drag_auto_hide_state_ == SHELF_AUTO_HIDE_HIDDEN &&
 859       visibility_state() == SHELF_AUTO_HIDE &&
 860       auto_hide_state() != SHELF_AUTO_HIDE_SHOWN) {
 861     // If the shelf was hidden when the drag started (and the state hasn't
 862     // changed since then, e.g. because the tray-menu was shown because of the
 863     // drag), then allow the drag some resistance-free region at first to make
 864     // sure the shelf sticks with the finger until the shelf is visible.
 865     resistance_free_region = kShelfSize - kAutoHideSize;
 866   }
 867
 868   bool resist = SelectValueForShelfAlignment(
 869       gesture_drag_amount_ < -resistance_free_region,
 870       gesture_drag_amount_ > resistance_free_region,
 871       gesture_drag_amount_ < -resistance_free_region,
 872       gesture_drag_amount_ > resistance_free_region);
 873
 874   float translate = 0.f;
 875   if (resist) {
 876     float diff = fabsf(gesture_drag_amount_) - resistance_free_region;
 877     diff = std::min(diff, sqrtf(diff));
 878     if (gesture_drag_amount_ < 0)
 879       translate = -resistance_free_region - diff;
 880     else
 881       translate = resistance_free_region + diff;
 882   } else {
 883     translate = gesture_drag_amount_;
 884   }
 885
 886   if (horizontal) {
 887     // Move and size the shelf with the gesture.
 888     int shelf_height = target_bounds->shelf_bounds_in_root.height() - translate;
 889     shelf_height = std::max(shelf_height, kAutoHideSize);
 890     target_bounds->shelf_bounds_in_root.set_height(shelf_height);
 891     if (GetAlignment() == SHELF_ALIGNMENT_BOTTOM) {
 892       target_bounds->shelf_bounds_in_root.set_y(
 893           available_bounds.bottom() - shelf_height);
 894     }
 895
 896     target_bounds->status_bounds_in_shelf.set_y(0);
 897   } else {
 898     // Move and size the shelf with the gesture.
 899     int shelf_width = target_bounds->shelf_bounds_in_root.width();
 900     bool right_aligned = GetAlignment() == SHELF_ALIGNMENT_RIGHT;
 901     if (right_aligned)
 902       shelf_width -= translate;
 903     else
 904       shelf_width += translate;
 905     shelf_width = std::max(shelf_width, kAutoHideSize);
 906     target_bounds->shelf_bounds_in_root.set_width(shelf_width);
 907     if (right_aligned) {
 908       target_bounds->shelf_bounds_in_root.set_x(
 909           available_bounds.right() - shelf_width);
 910     }
 911
 912     if (right_aligned)
 913       target_bounds->status_bounds_in_shelf.set_x(0);
 914     else
 915       target_bounds->status_bounds_in_shelf.set_x(
 916           target_bounds->shelf_bounds_in_root.width() -
 917           kShelfSize);
 918   }
 919 }
 920
 921 void ShelfLayoutManager::UpdateShelfBackground(
 922     BackgroundAnimatorChangeType type) {
 923   const ShelfBackgroundType background_type(GetShelfBackgroundType());
 924   shelf_->SetPaintsBackground(background_type, type);
 925   FOR_EACH_OBSERVER(ShelfLayoutManagerObserver, observers_,
 926                     OnBackgroundUpdated(background_type, type));
 927 }
 928
 929 ShelfBackgroundType ShelfLayoutManager::GetShelfBackgroundType() const {
 930   if (state_.visibility_state != SHELF_AUTO_HIDE &&
 931       state_.window_state == WORKSPACE_WINDOW_STATE_MAXIMIZED) {
 932     return SHELF_BACKGROUND_MAXIMIZED;
 933   }
 934
 935   if (gesture_drag_status_ == GESTURE_DRAG_IN_PROGRESS ||
 936       (!state_.is_screen_locked && !state_.is_adding_user_screen &&
 937        window_overlaps_shelf_) ||
 938       (state_.visibility_state == SHELF_AUTO_HIDE)) {
 939     return SHELF_BACKGROUND_OVERLAP;
 940   }
 941
 942   return SHELF_BACKGROUND_DEFAULT;
 943 }
 944
 945 void ShelfLayoutManager::UpdateAutoHideStateNow() {
 946   SetState(state_.visibility_state);
 947
 948   // If the state did not change, the auto hide timer may still be running.
 949   StopAutoHideTimer();
 950 }
 951
 952 void ShelfLayoutManager::StopAutoHideTimer() {
 953   auto_hide_timer_.Stop();
 954   mouse_over_shelf_when_auto_hide_timer_started_ = false;
 955 }
 956
 957 gfx::Rect ShelfLayoutManager::GetAutoHideShowShelfRegionInScreen() const {
 958   gfx::Rect shelf_bounds_in_screen = shelf_->GetWindowBoundsInScreen();
 959   gfx::Vector2d offset = SelectValueForShelfAlignment(
 960       gfx::Vector2d(0, shelf_bounds_in_screen.height()),
 961       gfx::Vector2d(-kMaxAutoHideShowShelfRegionSize, 0),
 962       gfx::Vector2d(shelf_bounds_in_screen.width(), 0),
 963       gfx::Vector2d(0, -kMaxAutoHideShowShelfRegionSize));
 964
 965   gfx::Rect show_shelf_region_in_screen = shelf_bounds_in_screen;
 966   show_shelf_region_in_screen += offset;
 967   if (IsHorizontalAlignment())
 968     show_shelf_region_in_screen.set_height(kMaxAutoHideShowShelfRegionSize);
 969   else
 970     show_shelf_region_in_screen.set_width(kMaxAutoHideShowShelfRegionSize);
 971
 972   // TODO: Figure out if we need any special handling when the keyboard is
 973   // visible.
 974   return show_shelf_region_in_screen;
 975 }
 976
 977 ShelfAutoHideState ShelfLayoutManager::CalculateAutoHideState(
 978     ShelfVisibilityState visibility_state) const {
 979   if (visibility_state != SHELF_AUTO_HIDE || !shelf_)
 980     return SHELF_AUTO_HIDE_HIDDEN;
 981
 982   Shell* shell = Shell::GetInstance();
 983   // Unhide the shelf only on the active screen when the AppList is shown
 984   // (crbug.com/312445).
 985   if (shell->GetAppListTargetVisibility()) {
 986     aura::Window* active_window = wm::GetActiveWindow();
 987     aura::Window* shelf_window = shelf_->GetNativeWindow();
 988     if (active_window && shelf_window &&
 989         active_window->GetRootWindow() == shelf_window->GetRootWindow()) {
 990       return SHELF_AUTO_HIDE_SHOWN;
 991     }
 992   }
 993
 994   if (shelf_->status_area_widget() &&
 995       shelf_->status_area_widget()->ShouldShowShelf())
 996     return SHELF_AUTO_HIDE_SHOWN;
 997
 998   if (shelf_->shelf() && shelf_->shelf()->IsShowingMenu())
 999     return SHELF_AUTO_HIDE_SHOWN;
1000
1001   if (shelf_->shelf() && shelf_->shelf()->IsShowingOverflowBubble())
1002     return SHELF_AUTO_HIDE_SHOWN;
1003
1004   if (shelf_->IsActive() ||
1005       (shelf_->status_area_widget() &&
1006        shelf_->status_area_widget()->IsActive()))
1007     return SHELF_AUTO_HIDE_SHOWN;
1008
1009   const std::vector<aura::Window*> windows =
1010       shell->mru_window_tracker()->BuildWindowListIgnoreModal();
1011
1012   // Process the window list and check if there are any visible windows.
1013   bool visible_window = false;
1014   for (size_t i = 0; i < windows.size(); ++i) {
1015     if (windows[i] && windows[i]->IsVisible() &&
1016         !wm::GetWindowState(windows[i])->IsMinimized() &&
1017         root_window_ == windows[i]->GetRootWindow()) {
1018       visible_window = true;
1019       break;
1020     }
1021   }
1022   // If there are no visible windows do not hide the shelf.
1023   if (!visible_window)
1024     return SHELF_AUTO_HIDE_SHOWN;
1025
1026   if (gesture_drag_status_ == GESTURE_DRAG_COMPLETE_IN_PROGRESS)
1027     return gesture_drag_auto_hide_state_;
1028
1029   // Don't show if the user is dragging the mouse.
1030   if (auto_hide_event_filter_.get() && auto_hide_event_filter_->in_mouse_drag())
1031     return SHELF_AUTO_HIDE_HIDDEN;
1032
1033   // Ignore the mouse position if mouse events are disabled.
1034   aura::client::CursorClient* cursor_client = aura::client::GetCursorClient(
1035       shelf_->GetNativeWindow()->GetRootWindow());
1036   if (!cursor_client->IsMouseEventsEnabled())
1037     return SHELF_AUTO_HIDE_HIDDEN;
1038
1039   gfx::Rect shelf_region = shelf_->GetWindowBoundsInScreen();
1040   if (shelf_->status_area_widget() &&
1041       shelf_->status_area_widget()->IsMessageBubbleShown() &&
1042       IsVisible()) {
1043     // Increase the the hit test area to prevent the shelf from disappearing
1044     // when the mouse is over the bubble gap.
1045     ShelfAlignment alignment = GetAlignment();
1046     shelf_region.Inset(alignment == SHELF_ALIGNMENT_RIGHT ?
1047                            -kNotificationBubbleGapHeight : 0,
1048                        alignment == SHELF_ALIGNMENT_BOTTOM ?
1049                            -kNotificationBubbleGapHeight : 0,
1050                        alignment == SHELF_ALIGNMENT_LEFT ?
1051                            -kNotificationBubbleGapHeight : 0,
1052                        alignment == SHELF_ALIGNMENT_TOP ?
1053                            -kNotificationBubbleGapHeight : 0);
1054   }
1055
1056   gfx::Point cursor_position_in_screen =
1057       Shell::GetScreen()->GetCursorScreenPoint();
1058   if (shelf_region.Contains(cursor_position_in_screen))
1059     return SHELF_AUTO_HIDE_SHOWN;
1060
1061   // When the shelf is auto hidden and the shelf is on the boundary between two
1062   // displays, it is hard to trigger showing the shelf. For instance, if a
1063   // user's primary display is left of their secondary display, it is hard to
1064   // unautohide a left aligned shelf on the secondary display.
1065   // It is hard because:
1066   // - It is hard to stop the cursor in the shelf "light bar" and not overshoot.
1067   // - The cursor is warped to the other display if the cursor gets to the edge
1068   //   of the display.
1069   // Show the shelf if the cursor started on the shelf and the user overshot the
1070   // shelf slightly to make it easier to show the shelf in this situation. We
1071   // do not check |auto_hide_timer_|.IsRunning() because it returns false when
1072   // the timer's task is running.
1073   if ((state_.auto_hide_state == SHELF_AUTO_HIDE_SHOWN ||
1074        mouse_over_shelf_when_auto_hide_timer_started_) &&
1075       GetAutoHideShowShelfRegionInScreen().Contains(
1076           cursor_position_in_screen)) {
1077     return SHELF_AUTO_HIDE_SHOWN;
1078   }
1079
1080   return SHELF_AUTO_HIDE_HIDDEN;
1081 }
1082
1083 bool ShelfLayoutManager::IsShelfWindow(aura::Window* window) {
1084   if (!window)
1085     return false;
1086   return (shelf_ && shelf_->GetNativeWindow()->Contains(window)) ||
1087       (shelf_->status_area_widget() &&
1088        shelf_->status_area_widget()->GetNativeWindow()->Contains(window));
1089 }
1090
1091 int ShelfLayoutManager::GetWorkAreaSize(const State& state, int size) const {
1092   if (state.visibility_state == SHELF_VISIBLE)
1093     return size;
1094   if (state.visibility_state == SHELF_AUTO_HIDE)
1095     return kAutoHideSize;
1096   return 0;
1097 }
1098
1099 void ShelfLayoutManager::OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) {
1100   bool keyboard_is_about_to_hide = false;
1101   if (new_bounds.IsEmpty() && !keyboard_bounds_.IsEmpty())
1102     keyboard_is_about_to_hide = true;
1103
1104   keyboard_bounds_ = new_bounds;
1105   OnWindowResized();
1106
1107   SessionStateDelegate* session_state_delegate =
1108       Shell::GetInstance()->session_state_delegate();
1109
1110   // On login screen if keyboard has been just hidden, update bounds just once
1111   // but ignore target_bounds.work_area_insets since shelf overlaps with login
1112   // window.
1113   if (session_state_delegate->IsUserSessionBlocked() &&
1114       keyboard_is_about_to_hide) {
1115     Shell::GetInstance()->SetDisplayWorkAreaInsets(root_window_, gfx::Insets());
1116   }
1117 }
1118
1119 void ShelfLayoutManager::OnDockBoundsChanging(
1120     const gfx::Rect& dock_bounds,
1121     DockedWindowLayoutManagerObserver::Reason reason) {
1122   // Skip shelf layout in case docked notification originates from this class.
1123   if (reason == DISPLAY_INSETS_CHANGED)
1124     return;
1125   if (dock_bounds_ != dock_bounds) {
1126     dock_bounds_ = dock_bounds;
1127     OnWindowResized();
1128     UpdateVisibilityState();
1129     UpdateShelfBackground(BACKGROUND_CHANGE_ANIMATE);
1130   }
1131 }
1132
1133 void ShelfLayoutManager::OnLockStateEvent(LockStateObserver::EventType event) {
1134   if (event == EVENT_LOCK_ANIMATION_STARTED) {
1135     // Enter the screen locked state and update the visibility to avoid an odd
1136     // animation when transitioning the orientation from L/R to bottom.
1137     state_.is_screen_locked = true;
1138     UpdateShelfVisibilityAfterLoginUIChange();
1139   }
1140 }
1141
1142 void ShelfLayoutManager::SessionStateChanged(
1143     SessionStateDelegate::SessionState state) {
1144   // Check transition changes to/from the add user to session and change the
1145   // shelf alignment accordingly
1146   bool add_user = state == SessionStateDelegate::SESSION_STATE_LOGIN_SECONDARY;
1147   if (add_user != state_.is_adding_user_screen) {
1148     state_.is_adding_user_screen = add_user;
1149     UpdateShelfVisibilityAfterLoginUIChange();
1150     return;
1151   }
1152   TargetBounds target_bounds;
1153   CalculateTargetBounds(state_, &target_bounds);
1154   UpdateBoundsAndOpacity(target_bounds, true, NULL);
1155   UpdateVisibilityState();
1156 }
1157
1158 void ShelfLayoutManager::UpdateShelfVisibilityAfterLoginUIChange() {
1159   shelf_->SetAlignment(GetAlignment());
1160   UpdateVisibilityState();
1161   LayoutShelf();
1162 }
1163
1164 bool ShelfLayoutManager::IsAlignmentLocked() const {
1165   SessionStateDelegate* session_state_delegate =
1166       Shell::GetInstance()->session_state_delegate();
1167   if (state_.is_screen_locked)
1168     return true;
1169   // The session state becomes active at the start of transitioning to a user
1170   // session, however the session is considered blocked until the full UI is
1171   // ready. Exit early to allow for proper layout.
1172   if (session_state_delegate->GetSessionState() ==
1173       SessionStateDelegate::SESSION_STATE_ACTIVE) {
1174     return false;
1175   }
1176   if (session_state_delegate->IsUserSessionBlocked() ||
1177       state_.is_adding_user_screen) {
1178     return true;
1179   }
1180   return false;
1181 }
1182
1183 }  // namespace ash