shelf_layout_manager.cc revision a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7 
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
51namespace ash {
52namespace internal {
53
54namespace {
55
56// Delay before showing the launcher. This is after the mouse stops moving.
57const 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.
62const 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.
74const int kMaxAutoHideShowShelfRegionSize = 10;
75
76ui::Layer* GetLayer(views::Widget* widget) {
77  return widget->GetNativeView()->layer();
78}
79
80bool 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
89const int ShelfLayoutManager::kWorkspaceAreaVisibleInset = 2;
90
91// static
92const int ShelfLayoutManager::kWorkspaceAreaAutoHideInset = 5;
93
94// static
95const int ShelfLayoutManager::kAutoHideSize = 3;
96
97// static
98const int ShelfLayoutManager::kShelfSize = 47;
99
100// static
101const int ShelfLayoutManager::kShelfItemInset = 3;
102
103int 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.
111class 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
130ShelfLayoutManager::AutoHideEventFilter::AutoHideEventFilter(
131    ShelfLayoutManager* shelf)
132    : shelf_(shelf),
133      in_mouse_drag_(false) {
134  Shell::GetInstance()->AddPreTargetHandler(this);
135}
136
137ShelfLayoutManager::AutoHideEventFilter::~AutoHideEventFilter() {
138  Shell::GetInstance()->RemovePreTargetHandler(this);
139}
140
141void 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
154void 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.
166class 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(BACKGROUND_CHANGE_ANIMATE);
180    delete this;
181  }
182
183 private:
184  virtual ~UpdateShelfObserver() {
185    if (shelf_)
186      shelf_->update_shelf_observer_ = NULL;
187  }
188
189  // Shelf we're in. NULL if deleted before we're deleted.
190  ShelfLayoutManager* shelf_;
191
192  DISALLOW_COPY_AND_ASSIGN(UpdateShelfObserver);
193};
194
195// ShelfLayoutManager ----------------------------------------------------------
196
197ShelfLayoutManager::ShelfLayoutManager(ShelfWidget* shelf)
198    : root_window_(shelf->GetNativeView()->GetRootWindow()),
199      updating_bounds_(false),
200      auto_hide_behavior_(SHELF_AUTO_HIDE_BEHAVIOR_NEVER),
201      alignment_(SHELF_ALIGNMENT_BOTTOM),
202      shelf_(shelf),
203      workspace_controller_(NULL),
204      window_overlaps_shelf_(false),
205      mouse_over_shelf_when_auto_hide_timer_started_(false),
206      bezel_event_filter_(new ShelfBezelEventFilter(this)),
207      gesture_drag_status_(GESTURE_DRAG_NONE),
208      gesture_drag_amount_(0.f),
209      gesture_drag_auto_hide_state_(SHELF_AUTO_HIDE_SHOWN),
210      update_shelf_observer_(NULL) {
211  Shell::GetInstance()->AddShellObserver(this);
212  Shell::GetInstance()->lock_state_controller()->AddObserver(this);
213  aura::client::GetActivationClient(root_window_)->AddObserver(this);
214}
215
216ShelfLayoutManager::~ShelfLayoutManager() {
217  if (update_shelf_observer_)
218    update_shelf_observer_->Detach();
219
220  FOR_EACH_OBSERVER(ShelfLayoutManagerObserver, observers_, WillDeleteShelf());
221  Shell::GetInstance()->RemoveShellObserver(this);
222  Shell::GetInstance()->lock_state_controller()->RemoveObserver(this);
223  aura::client::GetActivationClient(root_window_)->RemoveObserver(this);
224}
225
226void ShelfLayoutManager::SetAutoHideBehavior(ShelfAutoHideBehavior behavior) {
227  if (auto_hide_behavior_ == behavior)
228    return;
229  auto_hide_behavior_ = behavior;
230  UpdateVisibilityState();
231  FOR_EACH_OBSERVER(ShelfLayoutManagerObserver, observers_,
232                    OnAutoHideBehaviorChanged(root_window_,
233                                              auto_hide_behavior_));
234}
235
236void ShelfLayoutManager::PrepareForShutdown() {
237  // Clear all event filters, otherwise sometimes those filters may catch
238  // synthesized mouse event and cause crashes during the shutdown.
239  set_workspace_controller(NULL);
240  auto_hide_event_filter_.reset();
241  bezel_event_filter_.reset();
242}
243
244bool ShelfLayoutManager::IsVisible() const {
245  // status_area_widget() may be NULL during the shutdown.
246  return shelf_->status_area_widget() &&
247      shelf_->status_area_widget()->IsVisible() &&
248      (state_.visibility_state == SHELF_VISIBLE ||
249       (state_.visibility_state == SHELF_AUTO_HIDE &&
250        state_.auto_hide_state == SHELF_AUTO_HIDE_SHOWN));
251}
252
253bool ShelfLayoutManager::SetAlignment(ShelfAlignment alignment) {
254  if (alignment_ == alignment)
255    return false;
256
257  // This should not be called during the lock screen transitions.
258  DCHECK(!Shell::GetInstance()->session_state_delegate()->IsScreenLocked());
259  alignment_ = alignment;
260  shelf_->SetAlignment(alignment);
261  LayoutShelf();
262  return true;
263}
264
265ShelfAlignment ShelfLayoutManager::GetAlignment() const {
266  // When the screen is locked, the shelf is forced into bottom alignment.
267  if (Shell::GetInstance()->session_state_delegate()->IsScreenLocked())
268    return SHELF_ALIGNMENT_BOTTOM;
269  return alignment_;
270}
271
272gfx::Rect ShelfLayoutManager::GetIdealBounds() {
273  gfx::Rect bounds(
274      ScreenAsh::GetDisplayBoundsInParent(shelf_->GetNativeView()));
275  int width = 0, height = 0;
276  GetShelfSize(&width, &height);
277  return SelectValueForShelfAlignment(
278      gfx::Rect(bounds.x(), bounds.bottom() - height, bounds.width(), height),
279      gfx::Rect(bounds.x(), bounds.y(), width, bounds.height()),
280      gfx::Rect(bounds.right() - width, bounds.y(), width, bounds.height()),
281      gfx::Rect(bounds.x(), bounds.y(), bounds.width(), height));
282}
283
284void ShelfLayoutManager::LayoutShelf() {
285  TargetBounds target_bounds;
286  CalculateTargetBounds(state_, &target_bounds);
287  UpdateBoundsAndOpacity(target_bounds, false, NULL);
288
289  if (shelf_->launcher()) {
290    // This is not part of UpdateBoundsAndOpacity() because
291    // SetShelfViewBounds() sets the bounds immediately and does not animate.
292    // The height of the ShelfView for a horizontal shelf and the width of
293    // the ShelfView for a vertical shelf are set when |shelf_|'s bounds
294    // are changed via UpdateBoundsAndOpacity(). This sets the origin and the
295    // dimension in the other direction.
296    shelf_->launcher()->SetShelfViewBounds(
297        target_bounds.launcher_bounds_in_shelf);
298  }
299}
300
301ShelfVisibilityState ShelfLayoutManager::CalculateShelfVisibility() {
302  switch(auto_hide_behavior_) {
303    case SHELF_AUTO_HIDE_BEHAVIOR_ALWAYS:
304      return SHELF_AUTO_HIDE;
305    case SHELF_AUTO_HIDE_BEHAVIOR_NEVER:
306      return SHELF_VISIBLE;
307    case SHELF_AUTO_HIDE_ALWAYS_HIDDEN:
308      return SHELF_HIDDEN;
309  }
310  return SHELF_VISIBLE;
311}
312
313void ShelfLayoutManager::UpdateVisibilityState() {
314  if (Shell::GetInstance()->session_state_delegate()->IsScreenLocked()) {
315    SetState(SHELF_VISIBLE);
316  } else {
317    // TODO(zelidrag): Verify shelf drag animation still shows on the device
318    // when we are in SHELF_AUTO_HIDE_ALWAYS_HIDDEN.
319    WorkspaceWindowState window_state(workspace_controller_->GetWindowState());
320    switch (window_state) {
321      case WORKSPACE_WINDOW_STATE_FULL_SCREEN: {
322        const aura::Window* fullscreen_window = GetRootWindowController(
323            root_window_)->GetWindowForFullscreenMode();
324        if (fullscreen_window && wm::GetWindowState(fullscreen_window)->
325                hide_shelf_when_fullscreen()) {
326          SetState(SHELF_HIDDEN);
327        } else {
328          // The shelf is sometimes not hidden when in immersive fullscreen.
329          // Force the shelf to be auto hidden in this case.
330          SetState(SHELF_AUTO_HIDE);
331        }
332        break;
333      }
334
335      case WORKSPACE_WINDOW_STATE_MAXIMIZED:
336        SetState(CalculateShelfVisibility());
337        break;
338
339      case WORKSPACE_WINDOW_STATE_WINDOW_OVERLAPS_SHELF:
340      case WORKSPACE_WINDOW_STATE_DEFAULT:
341        SetState(CalculateShelfVisibility());
342        SetWindowOverlapsShelf(window_state ==
343                               WORKSPACE_WINDOW_STATE_WINDOW_OVERLAPS_SHELF);
344        break;
345    }
346  }
347}
348
349void ShelfLayoutManager::UpdateAutoHideState() {
350  ShelfAutoHideState auto_hide_state =
351      CalculateAutoHideState(state_.visibility_state);
352  if (auto_hide_state != state_.auto_hide_state) {
353    if (auto_hide_state == SHELF_AUTO_HIDE_HIDDEN) {
354      // Hides happen immediately.
355      SetState(state_.visibility_state);
356    } else {
357      if (!auto_hide_timer_.IsRunning()) {
358        mouse_over_shelf_when_auto_hide_timer_started_ =
359            shelf_->GetWindowBoundsInScreen().Contains(
360                Shell::GetScreen()->GetCursorScreenPoint());
361      }
362      auto_hide_timer_.Start(
363          FROM_HERE,
364          base::TimeDelta::FromMilliseconds(kAutoHideDelayMS),
365          this, &ShelfLayoutManager::UpdateAutoHideStateNow);
366    }
367  } else {
368    StopAutoHideTimer();
369  }
370}
371
372void ShelfLayoutManager::SetWindowOverlapsShelf(bool value) {
373  window_overlaps_shelf_ = value;
374  UpdateShelfBackground(BACKGROUND_CHANGE_ANIMATE);
375}
376
377void ShelfLayoutManager::AddObserver(ShelfLayoutManagerObserver* observer) {
378  observers_.AddObserver(observer);
379}
380
381void ShelfLayoutManager::RemoveObserver(ShelfLayoutManagerObserver* observer) {
382  observers_.RemoveObserver(observer);
383}
384
385////////////////////////////////////////////////////////////////////////////////
386// ShelfLayoutManager, Gesture dragging:
387
388void ShelfLayoutManager::StartGestureDrag(const ui::GestureEvent& gesture) {
389  gesture_drag_status_ = GESTURE_DRAG_IN_PROGRESS;
390  gesture_drag_amount_ = 0.f;
391  gesture_drag_auto_hide_state_ = visibility_state() == SHELF_AUTO_HIDE ?
392      auto_hide_state() : SHELF_AUTO_HIDE_SHOWN;
393  UpdateShelfBackground(BACKGROUND_CHANGE_ANIMATE);
394}
395
396ShelfLayoutManager::DragState ShelfLayoutManager::UpdateGestureDrag(
397    const ui::GestureEvent& gesture) {
398  bool horizontal = IsHorizontalAlignment();
399  gesture_drag_amount_ += horizontal ? gesture.details().scroll_y() :
400                                       gesture.details().scroll_x();
401  LayoutShelf();
402
403  // Start reveling the status menu when:
404  //   - dragging up on an already visible shelf
405  //   - dragging up on a hidden shelf, but it is currently completely visible.
406  if (horizontal && gesture.details().scroll_y() < 0) {
407    int min_height = 0;
408    if (gesture_drag_auto_hide_state_ == SHELF_AUTO_HIDE_HIDDEN && shelf_)
409      min_height = shelf_->GetContentsView()->GetPreferredSize().height();
410
411    if (min_height < shelf_->GetWindowBoundsInScreen().height() &&
412        gesture.root_location().x() >=
413        shelf_->status_area_widget()->GetWindowBoundsInScreen().x() &&
414        IsDraggingTrayEnabled())
415      return DRAG_TRAY;
416  }
417
418  return DRAG_SHELF;
419}
420
421void ShelfLayoutManager::CompleteGestureDrag(const ui::GestureEvent& gesture) {
422  bool horizontal = IsHorizontalAlignment();
423  bool should_change = false;
424  if (gesture.type() == ui::ET_GESTURE_SCROLL_END) {
425    // The visibility of the shelf changes only if the shelf was dragged X%
426    // along the correct axis. If the shelf was already visible, then the
427    // direction of the drag does not matter.
428    const float kDragHideThreshold = 0.4f;
429    gfx::Rect bounds = GetIdealBounds();
430    float drag_ratio = fabs(gesture_drag_amount_) /
431                       (horizontal ?  bounds.height() : bounds.width());
432    if (gesture_drag_auto_hide_state_ == SHELF_AUTO_HIDE_SHOWN) {
433      should_change = drag_ratio > kDragHideThreshold;
434    } else {
435      bool correct_direction = false;
436      switch (GetAlignment()) {
437        case SHELF_ALIGNMENT_BOTTOM:
438        case SHELF_ALIGNMENT_RIGHT:
439          correct_direction = gesture_drag_amount_ < 0;
440          break;
441        case SHELF_ALIGNMENT_LEFT:
442        case SHELF_ALIGNMENT_TOP:
443          correct_direction = gesture_drag_amount_ > 0;
444          break;
445      }
446      should_change = correct_direction && drag_ratio > kDragHideThreshold;
447    }
448  } else if (gesture.type() == ui::ET_SCROLL_FLING_START) {
449    if (gesture_drag_auto_hide_state_ == SHELF_AUTO_HIDE_SHOWN) {
450      should_change = horizontal ? fabs(gesture.details().velocity_y()) > 0 :
451                                   fabs(gesture.details().velocity_x()) > 0;
452    } else {
453      should_change = SelectValueForShelfAlignment(
454          gesture.details().velocity_y() < 0,
455          gesture.details().velocity_x() > 0,
456          gesture.details().velocity_x() < 0,
457          gesture.details().velocity_y() > 0);
458    }
459  } else {
460    NOTREACHED();
461  }
462
463  if (!should_change) {
464    CancelGestureDrag();
465    return;
466  }
467  if (shelf_) {
468    shelf_->Deactivate();
469    shelf_->status_area_widget()->Deactivate();
470  }
471  gesture_drag_auto_hide_state_ =
472      gesture_drag_auto_hide_state_ == SHELF_AUTO_HIDE_SHOWN ?
473      SHELF_AUTO_HIDE_HIDDEN : SHELF_AUTO_HIDE_SHOWN;
474  ShelfAutoHideBehavior new_auto_hide_behavior =
475      gesture_drag_auto_hide_state_ == SHELF_AUTO_HIDE_SHOWN ?
476      SHELF_AUTO_HIDE_BEHAVIOR_NEVER : SHELF_AUTO_HIDE_BEHAVIOR_ALWAYS;
477
478  // When in fullscreen and the shelf is forced to be auto hidden, the auto hide
479  // behavior affects neither the visibility state nor the auto hide state. Set
480  // |gesture_drag_status_| to GESTURE_DRAG_COMPLETE_IN_PROGRESS to set the auto
481  // hide state to |gesture_drag_auto_hide_state_|.
482  gesture_drag_status_ = GESTURE_DRAG_COMPLETE_IN_PROGRESS;
483  if (auto_hide_behavior_ != new_auto_hide_behavior)
484    SetAutoHideBehavior(new_auto_hide_behavior);
485  else
486    UpdateVisibilityState();
487  gesture_drag_status_ = GESTURE_DRAG_NONE;
488}
489
490void ShelfLayoutManager::CancelGestureDrag() {
491  gesture_drag_status_ = GESTURE_DRAG_CANCEL_IN_PROGRESS;
492  UpdateVisibilityState();
493  gesture_drag_status_ = GESTURE_DRAG_NONE;
494}
495
496////////////////////////////////////////////////////////////////////////////////
497// ShelfLayoutManager, aura::LayoutManager implementation:
498
499void ShelfLayoutManager::OnWindowResized() {
500  LayoutShelf();
501}
502
503void ShelfLayoutManager::OnWindowAddedToLayout(aura::Window* child) {
504}
505
506void ShelfLayoutManager::OnWillRemoveWindowFromLayout(aura::Window* child) {
507}
508
509void ShelfLayoutManager::OnWindowRemovedFromLayout(aura::Window* child) {
510}
511
512void ShelfLayoutManager::OnChildWindowVisibilityChanged(aura::Window* child,
513                                                        bool visible) {
514}
515
516void ShelfLayoutManager::SetChildBounds(aura::Window* child,
517                                        const gfx::Rect& requested_bounds) {
518  SetChildBoundsDirect(child, requested_bounds);
519  // We may contain other widgets (such as frame maximize bubble) but they don't
520  // effect the layout in anyway.
521  if (!updating_bounds_ &&
522      ((shelf_->GetNativeView() == child) ||
523       (shelf_->status_area_widget()->GetNativeView() == child))) {
524    LayoutShelf();
525  }
526}
527
528void ShelfLayoutManager::OnLockStateChanged(bool locked) {
529  // Force the shelf to layout for alignment (bottom if locked, restore
530  // the previous alignment otherwise).
531  shelf_->SetAlignment(locked ? SHELF_ALIGNMENT_BOTTOM : alignment_);
532  UpdateVisibilityState();
533  LayoutShelf();
534}
535
536void ShelfLayoutManager::OnWindowActivated(aura::Window* gained_active,
537                                           aura::Window* lost_active) {
538  UpdateAutoHideStateNow();
539}
540
541bool ShelfLayoutManager::IsHorizontalAlignment() const {
542  return GetAlignment() == SHELF_ALIGNMENT_BOTTOM ||
543         GetAlignment() == SHELF_ALIGNMENT_TOP;
544}
545
546// static
547ShelfLayoutManager* ShelfLayoutManager::ForLauncher(aura::Window* window) {
548  ShelfWidget* shelf = RootWindowController::ForLauncher(window)->shelf();
549  return shelf ? shelf->shelf_layout_manager() : NULL;
550}
551
552////////////////////////////////////////////////////////////////////////////////
553// ShelfLayoutManager, private:
554
555ShelfLayoutManager::TargetBounds::TargetBounds() : opacity(0.0f) {}
556ShelfLayoutManager::TargetBounds::~TargetBounds() {}
557
558void ShelfLayoutManager::SetState(ShelfVisibilityState visibility_state) {
559  if (!shelf_->GetNativeView())
560    return;
561
562  State state;
563  state.visibility_state = visibility_state;
564  state.auto_hide_state = CalculateAutoHideState(visibility_state);
565  state.is_screen_locked =
566      Shell::GetInstance()->session_state_delegate()->IsScreenLocked();
567  state.window_state = workspace_controller_ ?
568      workspace_controller_->GetWindowState() : WORKSPACE_WINDOW_STATE_DEFAULT;
569
570  // Force an update because gesture drags affect the shelf bounds and we
571  // should animate back to the normal bounds at the end of a gesture.
572  bool force_update =
573      (gesture_drag_status_ == GESTURE_DRAG_CANCEL_IN_PROGRESS ||
574       gesture_drag_status_ == GESTURE_DRAG_COMPLETE_IN_PROGRESS);
575
576  if (!force_update && state_.Equals(state))
577    return;  // Nothing changed.
578
579  FOR_EACH_OBSERVER(ShelfLayoutManagerObserver, observers_,
580                    WillChangeVisibilityState(visibility_state));
581
582  if (state.visibility_state == SHELF_AUTO_HIDE) {
583    // When state is SHELF_AUTO_HIDE we need to track when the mouse is over the
584    // launcher to unhide the shelf. AutoHideEventFilter does that for us.
585    if (!auto_hide_event_filter_)
586      auto_hide_event_filter_.reset(new AutoHideEventFilter(this));
587  } else {
588    auto_hide_event_filter_.reset(NULL);
589  }
590
591  StopAutoHideTimer();
592
593  State old_state = state_;
594  state_ = state;
595
596  BackgroundAnimatorChangeType change_type = BACKGROUND_CHANGE_ANIMATE;
597  bool delay_background_change = false;
598
599  // Do not animate the background when:
600  // - Going from a hidden / auto hidden shelf in fullscreen to a visible shelf
601  //   in maximized mode.
602  // - Going from an auto hidden shelf in maximized mode to a visible shelf in
603  //   maximized mode.
604  if (state.visibility_state == SHELF_VISIBLE &&
605      state.window_state == WORKSPACE_WINDOW_STATE_MAXIMIZED &&
606      old_state.visibility_state != SHELF_VISIBLE) {
607    change_type = BACKGROUND_CHANGE_IMMEDIATE;
608  } else {
609    // Delay the animation when the shelf was hidden, and has just been made
610    // visible (e.g. using a gesture-drag).
611    if (state.visibility_state == SHELF_VISIBLE &&
612        old_state.visibility_state == SHELF_AUTO_HIDE &&
613        old_state.auto_hide_state == SHELF_AUTO_HIDE_HIDDEN) {
614      delay_background_change = true;
615    }
616  }
617
618  if (delay_background_change) {
619    if (update_shelf_observer_)
620      update_shelf_observer_->Detach();
621    // UpdateShelfBackground deletes itself when the animation is done.
622    update_shelf_observer_ = new UpdateShelfObserver(this);
623  } else {
624    UpdateShelfBackground(change_type);
625  }
626
627  shelf_->SetDimsShelf(
628      state.visibility_state == SHELF_VISIBLE &&
629      state.window_state == WORKSPACE_WINDOW_STATE_MAXIMIZED);
630
631  TargetBounds target_bounds;
632  CalculateTargetBounds(state_, &target_bounds);
633  UpdateBoundsAndOpacity(target_bounds, true,
634      delay_background_change ? update_shelf_observer_ : NULL);
635
636  // OnAutoHideStateChanged Should be emitted when:
637  //  - firstly state changed to auto-hide from other state
638  //  - or, auto_hide_state has changed
639  if ((old_state.visibility_state != state_.visibility_state &&
640       state_.visibility_state == SHELF_AUTO_HIDE) ||
641      old_state.auto_hide_state != state_.auto_hide_state) {
642    FOR_EACH_OBSERVER(ShelfLayoutManagerObserver, observers_,
643                      OnAutoHideStateChanged(state_.auto_hide_state));
644  }
645}
646
647void ShelfLayoutManager::UpdateBoundsAndOpacity(
648    const TargetBounds& target_bounds,
649    bool animate,
650    ui::ImplicitAnimationObserver* observer) {
651  base::AutoReset<bool> auto_reset_updating_bounds(&updating_bounds_, true);
652
653  ui::ScopedLayerAnimationSettings launcher_animation_setter(
654      GetLayer(shelf_)->GetAnimator());
655  ui::ScopedLayerAnimationSettings status_animation_setter(
656      GetLayer(shelf_->status_area_widget())->GetAnimator());
657  if (animate) {
658    launcher_animation_setter.SetTransitionDuration(
659        base::TimeDelta::FromMilliseconds(kCrossFadeDurationMS));
660    launcher_animation_setter.SetTweenType(gfx::Tween::EASE_OUT);
661    launcher_animation_setter.SetPreemptionStrategy(
662        ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
663    status_animation_setter.SetTransitionDuration(
664        base::TimeDelta::FromMilliseconds(kCrossFadeDurationMS));
665    status_animation_setter.SetTweenType(gfx::Tween::EASE_OUT);
666    status_animation_setter.SetPreemptionStrategy(
667        ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
668  } else {
669    StopAnimating();
670    launcher_animation_setter.SetTransitionDuration(base::TimeDelta());
671    status_animation_setter.SetTransitionDuration(base::TimeDelta());
672  }
673  if (observer)
674    status_animation_setter.AddObserver(observer);
675
676  GetLayer(shelf_)->SetOpacity(target_bounds.opacity);
677  shelf_->SetBounds(ScreenAsh::ConvertRectToScreen(
678       shelf_->GetNativeView()->parent(),
679       target_bounds.shelf_bounds_in_root));
680
681  GetLayer(shelf_->status_area_widget())->SetOpacity(
682      target_bounds.status_opacity);
683  // TODO(harrym): Once status area widget is a child view of shelf
684  // this can be simplified.
685  gfx::Rect status_bounds = target_bounds.status_bounds_in_shelf;
686  status_bounds.set_x(status_bounds.x() +
687                      target_bounds.shelf_bounds_in_root.x());
688  status_bounds.set_y(status_bounds.y() +
689                      target_bounds.shelf_bounds_in_root.y());
690  shelf_->status_area_widget()->SetBounds(
691      ScreenAsh::ConvertRectToScreen(
692          shelf_->status_area_widget()->GetNativeView()->parent(),
693          status_bounds));
694  Shell::GetInstance()->SetDisplayWorkAreaInsets(
695      root_window_, target_bounds.work_area_insets);
696  UpdateHitTestBounds();
697}
698
699void ShelfLayoutManager::StopAnimating() {
700  GetLayer(shelf_)->GetAnimator()->StopAnimating();
701  GetLayer(shelf_->status_area_widget())->GetAnimator()->StopAnimating();
702}
703
704void ShelfLayoutManager::GetShelfSize(int* width, int* height) {
705  *width = *height = 0;
706  gfx::Size status_size(
707      shelf_->status_area_widget()->GetWindowBoundsInScreen().size());
708  if (IsHorizontalAlignment())
709    *height = GetPreferredShelfSize();
710  else
711    *width = GetPreferredShelfSize();
712}
713
714void ShelfLayoutManager::AdjustBoundsBasedOnAlignment(int inset,
715                                                      gfx::Rect* bounds) const {
716  bounds->Inset(SelectValueForShelfAlignment(
717      gfx::Insets(0, 0, inset, 0),
718      gfx::Insets(0, inset, 0, 0),
719      gfx::Insets(0, 0, 0, inset),
720      gfx::Insets(inset, 0, 0, 0)));
721}
722
723void ShelfLayoutManager::CalculateTargetBounds(
724    const State& state,
725    TargetBounds* target_bounds) {
726  const gfx::Rect available_bounds(GetAvailableBounds());
727  gfx::Rect status_size(
728      shelf_->status_area_widget()->GetWindowBoundsInScreen().size());
729  int shelf_width = 0, shelf_height = 0;
730  GetShelfSize(&shelf_width, &shelf_height);
731  if (IsHorizontalAlignment())
732    shelf_width = available_bounds.width();
733  else
734    shelf_height = available_bounds.height();
735
736  if (state.visibility_state == SHELF_AUTO_HIDE &&
737      state.auto_hide_state == SHELF_AUTO_HIDE_HIDDEN) {
738    // Auto-hidden shelf always starts with the default size. If a gesture-drag
739    // is in progress, then the call to UpdateTargetBoundsForGesture() below
740    // takes care of setting the height properly.
741    if (IsHorizontalAlignment())
742      shelf_height = kAutoHideSize;
743    else
744      shelf_width = kAutoHideSize;
745  } else if (state.visibility_state == SHELF_HIDDEN ||
746      !keyboard_bounds_.IsEmpty()) {
747    if (IsHorizontalAlignment())
748      shelf_height = 0;
749    else
750      shelf_width = 0;
751  }
752
753  target_bounds->shelf_bounds_in_root = SelectValueForShelfAlignment(
754      gfx::Rect(available_bounds.x(), available_bounds.bottom() - shelf_height,
755                    available_bounds.width(), shelf_height),
756      gfx::Rect(available_bounds.x(), available_bounds.y(),
757                    shelf_width, available_bounds.height()),
758      gfx::Rect(available_bounds.right() - shelf_width, available_bounds.y(),
759                    shelf_width, available_bounds.height()),
760      gfx::Rect(available_bounds.x(), available_bounds.y(),
761                    available_bounds.width(), shelf_height));
762
763  int status_inset = std::max(0, GetPreferredShelfSize() -
764      PrimaryAxisValue(status_size.height(), status_size.width()));
765
766  if (ash::switches::UseAlternateShelfLayout()) {
767    status_inset = 0;
768    if (IsHorizontalAlignment())
769      status_size.set_height(kShelfSize);
770    else
771      status_size.set_width(kShelfSize);
772  }
773
774  target_bounds->status_bounds_in_shelf = SelectValueForShelfAlignment(
775      gfx::Rect(base::i18n::IsRTL() ? 0 : shelf_width - status_size.width(),
776                    status_inset, status_size.width(), status_size.height()),
777      gfx::Rect(shelf_width - (status_size.width() + status_inset),
778                    shelf_height - status_size.height(), status_size.width(),
779                    status_size.height()),
780      gfx::Rect(status_inset, shelf_height - status_size.height(),
781                    status_size.width(), status_size.height()),
782      gfx::Rect(base::i18n::IsRTL() ? 0 : shelf_width - status_size.width(),
783                    shelf_height - (status_size.height() + status_inset),
784                    status_size.width(), status_size.height()));
785
786  target_bounds->work_area_insets = SelectValueForShelfAlignment(
787      gfx::Insets(0, 0, GetWorkAreaSize(state, shelf_height), 0),
788      gfx::Insets(0, GetWorkAreaSize(state, shelf_width), 0, 0),
789      gfx::Insets(0, 0, 0, GetWorkAreaSize(state, shelf_width)),
790      gfx::Insets(GetWorkAreaSize(state, shelf_height), 0, 0, 0));
791
792  // TODO(varkha): The functionality of managing insets for display areas
793  // should probably be pushed to a separate component. This would simplify or
794  // remove entirely the dependency on keyboard and dock.
795
796  // Also push in the work area inset for the keyboard if it is visible.
797  if (!keyboard_bounds_.IsEmpty()) {
798    gfx::Insets keyboard_insets(0, 0, keyboard_bounds_.height(), 0);
799    target_bounds->work_area_insets += keyboard_insets;
800  }
801
802  // Also push in the work area inset for the dock if it is visible.
803  if (!dock_bounds_.IsEmpty()) {
804    gfx::Insets dock_insets(
805        0, (dock_bounds_.x() > 0 ? 0 : dock_bounds_.width()),
806        0, (dock_bounds_.x() > 0 ? dock_bounds_.width() : 0));
807    target_bounds->work_area_insets += dock_insets;
808  }
809
810  target_bounds->opacity =
811      (gesture_drag_status_ == GESTURE_DRAG_IN_PROGRESS ||
812       state.visibility_state == SHELF_VISIBLE ||
813       state.visibility_state == SHELF_AUTO_HIDE) ? 1.0f : 0.0f;
814  target_bounds->status_opacity =
815      (state.visibility_state == SHELF_AUTO_HIDE &&
816       state.auto_hide_state == SHELF_AUTO_HIDE_HIDDEN &&
817       gesture_drag_status_ != GESTURE_DRAG_IN_PROGRESS) ?
818      0.0f : target_bounds->opacity;
819
820  if (gesture_drag_status_ == GESTURE_DRAG_IN_PROGRESS)
821    UpdateTargetBoundsForGesture(target_bounds);
822
823  // This needs to happen after calling UpdateTargetBoundsForGesture(), because
824  // that can change the size of the shelf.
825  target_bounds->launcher_bounds_in_shelf = SelectValueForShelfAlignment(
826      gfx::Rect(0, 0,
827                shelf_width - status_size.width(),
828                target_bounds->shelf_bounds_in_root.height()),
829      gfx::Rect(0, 0, target_bounds->shelf_bounds_in_root.width(),
830                shelf_height - status_size.height()),
831      gfx::Rect(0, 0, target_bounds->shelf_bounds_in_root.width(),
832                shelf_height - status_size.height()),
833      gfx::Rect(0, 0,
834                shelf_width - status_size.width(),
835                target_bounds->shelf_bounds_in_root.height()));
836}
837
838void ShelfLayoutManager::UpdateTargetBoundsForGesture(
839    TargetBounds* target_bounds) const {
840  CHECK_EQ(GESTURE_DRAG_IN_PROGRESS, gesture_drag_status_);
841  bool horizontal = IsHorizontalAlignment();
842  const gfx::Rect& available_bounds(root_window_->bounds());
843  int resistance_free_region = 0;
844
845  if (gesture_drag_auto_hide_state_ == SHELF_AUTO_HIDE_HIDDEN &&
846      visibility_state() == SHELF_AUTO_HIDE &&
847      auto_hide_state() != SHELF_AUTO_HIDE_SHOWN) {
848    // If the shelf was hidden when the drag started (and the state hasn't
849    // changed since then, e.g. because the tray-menu was shown because of the
850    // drag), then allow the drag some resistance-free region at first to make
851    // sure the shelf sticks with the finger until the shelf is visible.
852    resistance_free_region = GetPreferredShelfSize() - kAutoHideSize;
853  }
854
855  bool resist = SelectValueForShelfAlignment(
856      gesture_drag_amount_ < -resistance_free_region,
857      gesture_drag_amount_ > resistance_free_region,
858      gesture_drag_amount_ < -resistance_free_region,
859      gesture_drag_amount_ > resistance_free_region);
860
861  float translate = 0.f;
862  if (resist) {
863    float diff = fabsf(gesture_drag_amount_) - resistance_free_region;
864    diff = std::min(diff, sqrtf(diff));
865    if (gesture_drag_amount_ < 0)
866      translate = -resistance_free_region - diff;
867    else
868      translate = resistance_free_region + diff;
869  } else {
870    translate = gesture_drag_amount_;
871  }
872
873  if (horizontal) {
874    // Move and size the launcher with the gesture.
875    int shelf_height = target_bounds->shelf_bounds_in_root.height() - translate;
876    shelf_height = std::max(shelf_height, kAutoHideSize);
877    target_bounds->shelf_bounds_in_root.set_height(shelf_height);
878    if (GetAlignment() == SHELF_ALIGNMENT_BOTTOM) {
879      target_bounds->shelf_bounds_in_root.set_y(
880          available_bounds.bottom() - shelf_height);
881    }
882
883    if (ash::switches::UseAlternateShelfLayout()) {
884      target_bounds->status_bounds_in_shelf.set_y(0);
885    } else {
886      // The statusbar should be in the center of the shelf.
887      gfx::Rect status_y = target_bounds->shelf_bounds_in_root;
888      status_y.set_y(0);
889      status_y.ClampToCenteredSize(
890          target_bounds->status_bounds_in_shelf.size());
891      target_bounds->status_bounds_in_shelf.set_y(status_y.y());
892    }
893  } else {
894    // Move and size the launcher with the gesture.
895    int shelf_width = target_bounds->shelf_bounds_in_root.width();
896    bool right_aligned = GetAlignment() == SHELF_ALIGNMENT_RIGHT;
897    if (right_aligned)
898      shelf_width -= translate;
899    else
900      shelf_width += translate;
901    shelf_width = std::max(shelf_width, kAutoHideSize);
902    target_bounds->shelf_bounds_in_root.set_width(shelf_width);
903    if (right_aligned) {
904      target_bounds->shelf_bounds_in_root.set_x(
905          available_bounds.right() - shelf_width);
906    }
907
908    if (ash::switches::UseAlternateShelfLayout()) {
909      if (right_aligned)
910        target_bounds->status_bounds_in_shelf.set_x(0);
911      else
912        target_bounds->status_bounds_in_shelf.set_x(
913            target_bounds->shelf_bounds_in_root.width() -
914            kShelfSize);
915    } else {
916      // The statusbar should be in the center of the shelf.
917      gfx::Rect status_x = target_bounds->shelf_bounds_in_root;
918      status_x.set_x(0);
919      status_x.ClampToCenteredSize(
920          target_bounds->status_bounds_in_shelf.size());
921      target_bounds->status_bounds_in_shelf.set_x(status_x.x());
922    }
923  }
924}
925
926void ShelfLayoutManager::UpdateShelfBackground(
927    BackgroundAnimatorChangeType type) {
928  const ShelfBackgroundType background_type(GetShelfBackgroundType());
929  shelf_->SetPaintsBackground(background_type, type);
930  FOR_EACH_OBSERVER(ShelfLayoutManagerObserver, observers_,
931                    OnBackgroundUpdated(background_type, type));
932}
933
934ShelfBackgroundType ShelfLayoutManager::GetShelfBackgroundType() const {
935  if (state_.visibility_state != SHELF_AUTO_HIDE &&
936      state_.window_state == WORKSPACE_WINDOW_STATE_MAXIMIZED) {
937    return SHELF_BACKGROUND_MAXIMIZED;
938  }
939
940  if (gesture_drag_status_ == GESTURE_DRAG_IN_PROGRESS ||
941      (!state_.is_screen_locked && window_overlaps_shelf_) ||
942      (state_.visibility_state == SHELF_AUTO_HIDE)) {
943    return SHELF_BACKGROUND_OVERLAP;
944  }
945
946  return SHELF_BACKGROUND_DEFAULT;
947}
948
949void ShelfLayoutManager::UpdateAutoHideStateNow() {
950  SetState(state_.visibility_state);
951
952  // If the state did not change, the auto hide timer may still be running.
953  StopAutoHideTimer();
954}
955
956void ShelfLayoutManager::StopAutoHideTimer() {
957  auto_hide_timer_.Stop();
958  mouse_over_shelf_when_auto_hide_timer_started_ = false;
959}
960
961gfx::Rect ShelfLayoutManager::GetAutoHideShowShelfRegionInScreen() const {
962  gfx::Rect shelf_bounds_in_screen = shelf_->GetWindowBoundsInScreen();
963  gfx::Vector2d offset = SelectValueForShelfAlignment(
964      gfx::Vector2d(0, shelf_bounds_in_screen.height()),
965      gfx::Vector2d(-kMaxAutoHideShowShelfRegionSize, 0),
966      gfx::Vector2d(shelf_bounds_in_screen.width(), 0),
967      gfx::Vector2d(0, -kMaxAutoHideShowShelfRegionSize));
968
969  gfx::Rect show_shelf_region_in_screen = shelf_bounds_in_screen;
970  show_shelf_region_in_screen += offset;
971  if (IsHorizontalAlignment())
972    show_shelf_region_in_screen.set_height(kMaxAutoHideShowShelfRegionSize);
973  else
974    show_shelf_region_in_screen.set_width(kMaxAutoHideShowShelfRegionSize);
975
976  // TODO: Figure out if we need any special handling when the keyboard is
977  // visible.
978  return show_shelf_region_in_screen;
979}
980
981ShelfAutoHideState ShelfLayoutManager::CalculateAutoHideState(
982    ShelfVisibilityState visibility_state) const {
983  if (visibility_state != SHELF_AUTO_HIDE || !shelf_)
984    return SHELF_AUTO_HIDE_HIDDEN;
985
986  Shell* shell = Shell::GetInstance();
987  if (shell->GetAppListTargetVisibility())
988    return SHELF_AUTO_HIDE_SHOWN;
989
990  if (shelf_->status_area_widget() &&
991      shelf_->status_area_widget()->ShouldShowLauncher())
992    return SHELF_AUTO_HIDE_SHOWN;
993
994  if (shelf_->launcher() && shelf_->launcher()->IsShowingMenu())
995    return SHELF_AUTO_HIDE_SHOWN;
996
997  if (shelf_->launcher() && shelf_->launcher()->IsShowingOverflowBubble())
998    return SHELF_AUTO_HIDE_SHOWN;
999
1000  if (shelf_->IsActive() || shelf_->status_area_widget()->IsActive())
1001    return SHELF_AUTO_HIDE_SHOWN;
1002
1003  const std::vector<aura::Window*> windows =
1004      ash::MruWindowTracker::BuildWindowList(false);
1005
1006  // Process the window list and check if there are any visible windows.
1007  bool visible_window = false;
1008  for (size_t i = 0; i < windows.size(); ++i) {
1009    if (windows[i] && windows[i]->IsVisible() &&
1010        !wm::GetWindowState(windows[i])->IsMinimized() &&
1011        root_window_ == windows[i]->GetRootWindow()) {
1012      visible_window = true;
1013      break;
1014    }
1015  }
1016  // If there are no visible windows do not hide the shelf.
1017  if (!visible_window)
1018    return SHELF_AUTO_HIDE_SHOWN;
1019
1020  if (gesture_drag_status_ == GESTURE_DRAG_COMPLETE_IN_PROGRESS)
1021    return gesture_drag_auto_hide_state_;
1022
1023  // Don't show if the user is dragging the mouse.
1024  if (auto_hide_event_filter_.get() && auto_hide_event_filter_->in_mouse_drag())
1025    return SHELF_AUTO_HIDE_HIDDEN;
1026
1027  // Ignore the mouse position if mouse events are disabled.
1028  aura::client::CursorClient* cursor_client = aura::client::GetCursorClient(
1029      shelf_->GetNativeWindow()->GetRootWindow());
1030  if (!cursor_client->IsMouseEventsEnabled())
1031    return SHELF_AUTO_HIDE_HIDDEN;
1032
1033  gfx::Rect shelf_region = shelf_->GetWindowBoundsInScreen();
1034  if (shelf_->status_area_widget() &&
1035      shelf_->status_area_widget()->IsMessageBubbleShown() &&
1036      IsVisible()) {
1037    // Increase the the hit test area to prevent the shelf from disappearing
1038    // when the mouse is over the bubble gap.
1039    ShelfAlignment alignment = GetAlignment();
1040    shelf_region.Inset(alignment == SHELF_ALIGNMENT_RIGHT ?
1041                           -kNotificationBubbleGapHeight : 0,
1042                       alignment == SHELF_ALIGNMENT_BOTTOM ?
1043                           -kNotificationBubbleGapHeight : 0,
1044                       alignment == SHELF_ALIGNMENT_LEFT ?
1045                           -kNotificationBubbleGapHeight : 0,
1046                       alignment == SHELF_ALIGNMENT_TOP ?
1047                           -kNotificationBubbleGapHeight : 0);
1048  }
1049
1050  gfx::Point cursor_position_in_screen =
1051      Shell::GetScreen()->GetCursorScreenPoint();
1052  if (shelf_region.Contains(cursor_position_in_screen))
1053    return SHELF_AUTO_HIDE_SHOWN;
1054
1055  // When the shelf is auto hidden and the shelf is on the boundary between two
1056  // displays, it is hard to trigger showing the shelf. For instance, if a
1057  // user's primary display is left of their secondary display, it is hard to
1058  // unautohide a left aligned shelf on the secondary display.
1059  // It is hard because:
1060  // - It is hard to stop the cursor in the shelf "light bar" and not overshoot.
1061  // - The cursor is warped to the other display if the cursor gets to the edge
1062  //   of the display.
1063  // Show the shelf if the cursor started on the shelf and the user overshot the
1064  // shelf slightly to make it easier to show the shelf in this situation. We
1065  // do not check |auto_hide_timer_|.IsRunning() because it returns false when
1066  // the timer's task is running.
1067  if ((state_.auto_hide_state == SHELF_AUTO_HIDE_SHOWN ||
1068       mouse_over_shelf_when_auto_hide_timer_started_) &&
1069      GetAutoHideShowShelfRegionInScreen().Contains(
1070          cursor_position_in_screen)) {
1071    return SHELF_AUTO_HIDE_SHOWN;
1072  }
1073
1074  return SHELF_AUTO_HIDE_HIDDEN;
1075}
1076
1077void ShelfLayoutManager::UpdateHitTestBounds() {
1078  gfx::Insets mouse_insets;
1079  gfx::Insets touch_insets;
1080  if (state_.visibility_state == SHELF_VISIBLE) {
1081    // Let clicks at the very top of the launcher through so windows can be
1082    // resized with the bottom-right corner and bottom edge.
1083    mouse_insets = GetInsetsForAlignment(kWorkspaceAreaVisibleInset);
1084  } else if (state_.visibility_state == SHELF_AUTO_HIDE) {
1085    // Extend the touch hit target out a bit to allow users to drag shelf out
1086    // while hidden.
1087    touch_insets = GetInsetsForAlignment(-kWorkspaceAreaAutoHideInset);
1088  }
1089
1090  if (shelf_ && shelf_->GetNativeWindow())
1091    shelf_->GetNativeWindow()->SetHitTestBoundsOverrideOuter(mouse_insets,
1092                                                             touch_insets);
1093  shelf_->status_area_widget()->GetNativeWindow()->
1094      SetHitTestBoundsOverrideOuter(mouse_insets, touch_insets);
1095}
1096
1097bool ShelfLayoutManager::IsShelfWindow(aura::Window* window) {
1098  if (!window)
1099    return false;
1100  return (shelf_ && shelf_->GetNativeWindow()->Contains(window)) ||
1101      (shelf_->status_area_widget() &&
1102       shelf_->status_area_widget()->GetNativeWindow()->Contains(window));
1103}
1104
1105int ShelfLayoutManager::GetWorkAreaSize(const State& state, int size) const {
1106  if (state.visibility_state == SHELF_VISIBLE)
1107    return size;
1108  if (state.visibility_state == SHELF_AUTO_HIDE)
1109    return kAutoHideSize;
1110  return 0;
1111}
1112
1113gfx::Rect ShelfLayoutManager::GetAvailableBounds() const {
1114  gfx::Rect bounds(root_window_->bounds());
1115  bounds.set_height(bounds.height() - keyboard_bounds_.height());
1116  return bounds;
1117}
1118
1119void ShelfLayoutManager::OnKeyboardBoundsChanging(
1120    const gfx::Rect& keyboard_bounds) {
1121  keyboard_bounds_ = keyboard_bounds;
1122  OnWindowResized();
1123}
1124
1125void ShelfLayoutManager::OnDockBoundsChanging(
1126    const gfx::Rect& dock_bounds,
1127    DockedWindowLayoutManagerObserver::Reason reason) {
1128  // Skip shelf layout in case docked notification originates from this class.
1129  if (reason == DISPLAY_INSETS_CHANGED)
1130    return;
1131  if (dock_bounds_ != dock_bounds) {
1132    dock_bounds_ = dock_bounds;
1133    OnWindowResized();
1134    UpdateShelfBackground(BACKGROUND_CHANGE_ANIMATE);
1135  }
1136}
1137
1138void ShelfLayoutManager::OnLockStateEvent(LockStateObserver::EventType event) {
1139  if (event == EVENT_LOCK_ANIMATION_STARTED) {
1140    // Hide the status area widget (using auto hide animation).
1141    base::AutoReset<ShelfVisibilityState> state(&state_.visibility_state,
1142                                                SHELF_HIDDEN);
1143    TargetBounds target_bounds;
1144    CalculateTargetBounds(state_, &target_bounds);
1145    UpdateBoundsAndOpacity(target_bounds, true, NULL);
1146  }
1147}
1148
1149gfx::Insets ShelfLayoutManager::GetInsetsForAlignment(int distance) const {
1150  switch (GetAlignment()) {
1151    case SHELF_ALIGNMENT_BOTTOM:
1152      return gfx::Insets(distance, 0, 0, 0);
1153    case SHELF_ALIGNMENT_LEFT:
1154      return gfx::Insets(0, 0, 0, distance);
1155    case SHELF_ALIGNMENT_RIGHT:
1156      return gfx::Insets(0, distance, 0, 0);
1157    case SHELF_ALIGNMENT_TOP:
1158      return gfx::Insets(0, 0, distance, 0);
1159  }
1160  NOTREACHED();
1161  return gfx::Insets();
1162}
1163
1164}  // namespace internal
1165}  // namespace ash
1166