chromeos: Move files in //ash/common to //ash

ash/common/wm/panels/panel_layout_manager.cc

Index: ash/common/wm/panels/panel_layout_manager.cc
diff --git a/ash/common/wm/panels/panel_layout_manager.cc b/ash/common/wm/panels/panel_layout_manager.cc
deleted file mode 100644
index eb8dd671b2893d576a7a31c26812444b3a95bdc0..0000000000000000000000000000000000000000
--- a/ash/common/wm/panels/panel_layout_manager.cc
+++ /dev/null
@@ -1,929 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "ash/common/wm/panels/panel_layout_manager.h"
-
-#include <algorithm>
-#include <map>
-#include <utility>
-
-#include "ash/common/shelf/wm_shelf.h"
-#include "ash/common/shelf/wm_shelf_util.h"
-#include "ash/common/wm/overview/window_selector_controller.h"
-#include "ash/common/wm/window_animation_types.h"
-#include "ash/common/wm/window_parenting_utils.h"
-#include "ash/common/wm/window_state.h"
-#include "ash/common/wm_shell.h"
-#include "ash/common/wm_window.h"
-#include "ash/public/cpp/shell_window_ids.h"
-#include "ash/public/cpp/window_properties.h"
-#include "ash/root_window_controller.h"
-#include "ash/wm/window_properties.h"
-#include "base/auto_reset.h"
-#include "third_party/skia/include/core/SkColor.h"
-#include "third_party/skia/include/core/SkPath.h"
-#include "ui/compositor/scoped_layer_animation_settings.h"
-#include "ui/gfx/canvas.h"
-#include "ui/gfx/geometry/rect.h"
-#include "ui/gfx/geometry/vector2d.h"
-#include "ui/views/background.h"
-#include "ui/views/widget/widget.h"
-
-namespace ash {
-namespace {
-
-const int kPanelIdealSpacing = 4;
-
-const float kMaxHeightFactor = .80f;
-const float kMaxWidthFactor = .50f;
-
-// Duration for panel animations.
-const int kPanelSlideDurationMilliseconds = 50;
-const int kCalloutFadeDurationMilliseconds = 50;
-
-// Offset used when sliding panel in/out of the shelf. Used for minimizing,
-// restoring and the initial showing of a panel.
-const int kPanelSlideInOffset = 20;
-
-// Callout arrow dimensions.
-const int kArrowWidth = 18;
-const int kArrowHeight = 9;
-
-class CalloutWidgetBackground : public views::Background {
- public:
-  CalloutWidgetBackground() : alignment_(SHELF_ALIGNMENT_BOTTOM) {}
-
-  void Paint(gfx::Canvas* canvas, views::View* view) const override {
-    SkPath path;
-    switch (alignment_) {
-      case SHELF_ALIGNMENT_BOTTOM:
-      case SHELF_ALIGNMENT_BOTTOM_LOCKED:
-        path.moveTo(SkIntToScalar(0), SkIntToScalar(0));
-        path.lineTo(SkIntToScalar(kArrowWidth / 2),
-                    SkIntToScalar(kArrowHeight));
-        path.lineTo(SkIntToScalar(kArrowWidth), SkIntToScalar(0));
-        break;
-      case SHELF_ALIGNMENT_LEFT:
-        path.moveTo(SkIntToScalar(kArrowHeight), SkIntToScalar(kArrowWidth));
-        path.lineTo(SkIntToScalar(0), SkIntToScalar(kArrowWidth / 2));
-        path.lineTo(SkIntToScalar(kArrowHeight), SkIntToScalar(0));
-        break;
-      case SHELF_ALIGNMENT_RIGHT:
-        path.moveTo(SkIntToScalar(0), SkIntToScalar(0));
-        path.lineTo(SkIntToScalar(kArrowHeight),
-                    SkIntToScalar(kArrowWidth / 2));
-        path.lineTo(SkIntToScalar(0), SkIntToScalar(kArrowWidth));
-        break;
-    }
-    // Hard code the arrow color for now.
-    cc::PaintFlags flags;
-    flags.setStyle(cc::PaintFlags::kFill_Style);
-    flags.setColor(SkColorSetARGB(0xff, 0xe5, 0xe5, 0xe5));
-    canvas->DrawPath(path, flags);
-  }
-
-  ShelfAlignment alignment() { return alignment_; }
-
-  void set_alignment(ShelfAlignment alignment) { alignment_ = alignment; }
-
- private:
-  ShelfAlignment alignment_;
-
-  DISALLOW_COPY_AND_ASSIGN(CalloutWidgetBackground);
-};
-
-struct VisiblePanelPositionInfo {
-  VisiblePanelPositionInfo()
-      : min_major(0),
-        max_major(0),
-        major_pos(0),
-        major_length(0),
-        window(NULL),
-        slide_in(false) {}
-
-  int min_major;
-  int max_major;
-  int major_pos;
-  int major_length;
-  WmWindow* window;
-  bool slide_in;
-};
-
-bool CompareWindowMajor(const VisiblePanelPositionInfo& win1,
-                        const VisiblePanelPositionInfo& win2) {
-  return win1.major_pos < win2.major_pos;
-}
-
-void FanOutPanels(std::vector<VisiblePanelPositionInfo>::iterator first,
-                  std::vector<VisiblePanelPositionInfo>::iterator last) {
-  int num_panels = last - first;
-  if (num_panels == 1) {
-    (*first).major_pos = std::max(
-        (*first).min_major, std::min((*first).max_major, (*first).major_pos));
-  }
-  if (num_panels <= 1)
-    return;
-
-  if (num_panels == 2) {
-    // If there are two adjacent overlapping windows, separate them by the
-    // minimum major_length necessary.
-    std::vector<VisiblePanelPositionInfo>::iterator second = first + 1;
-    int separation = (*first).major_length / 2 + (*second).major_length / 2 +
-                     kPanelIdealSpacing;
-    int overlap = (*first).major_pos + separation - (*second).major_pos;
-    (*first).major_pos =
-        std::max((*first).min_major, (*first).major_pos - overlap / 2);
-    (*second).major_pos =
-        std::min((*second).max_major, (*first).major_pos + separation);
-    // Recalculate the first panel position in case the second one was
-    // constrained on the right.
-    (*first).major_pos =
-        std::max((*first).min_major, (*second).major_pos - separation);
-    return;
-  }
-
-  // If there are more than two overlapping windows, fan them out from minimum
-  // position to maximum position equally spaced.
-  int delta = ((*(last - 1)).max_major - (*first).min_major) / (num_panels - 1);
-  int major_pos = (*first).min_major;
-  for (std::vector<VisiblePanelPositionInfo>::iterator iter = first;
-       iter != last; ++iter) {
-    (*iter).major_pos =
-        std::max((*iter).min_major, std::min((*iter).max_major, major_pos));
-    major_pos += delta;
-  }
-}
-
-bool BoundsAdjacent(const gfx::Rect& bounds1, const gfx::Rect& bounds2) {
-  return bounds1.x() == bounds2.right() || bounds1.y() == bounds2.bottom() ||
-         bounds1.right() == bounds2.x() || bounds1.bottom() == bounds2.y();
-}
-
-gfx::Vector2d GetSlideInAnimationOffset(ShelfAlignment alignment) {
-  gfx::Vector2d offset;
-  if (alignment == SHELF_ALIGNMENT_LEFT)
-    offset.set_x(-kPanelSlideInOffset);
-  else if (alignment == SHELF_ALIGNMENT_RIGHT)
-    offset.set_x(kPanelSlideInOffset);
-  else
-    offset.set_y(kPanelSlideInOffset);
-  return offset;
-}
-
-}  // namespace
-
-class PanelCalloutWidget : public views::Widget {
- public:
-  explicit PanelCalloutWidget(WmWindow* container) : background_(nullptr) {
-    InitWidget(container);
-  }
-
-  void SetAlignment(ShelfAlignment alignment) {
-    WmWindow* window = WmWindow::Get(this->GetNativeWindow());
-    gfx::Rect callout_bounds = window->GetBounds();
-    if (IsHorizontalAlignment(alignment)) {
-      callout_bounds.set_width(kArrowWidth);
-      callout_bounds.set_height(kArrowHeight);
-    } else {
-      callout_bounds.set_width(kArrowHeight);
-      callout_bounds.set_height(kArrowWidth);
-    }
-    WmWindow* parent = window->GetParent();
-    // It's important this go through WmWindow and not Widget. Going through
-    // Widget means it may move do a different screen, we don't want that.
-    window->SetBounds(callout_bounds);
-    // Setting the bounds should not trigger changing the parent.
-    DCHECK_EQ(parent, window->GetParent());
-    if (background_->alignment() != alignment) {
-      background_->set_alignment(alignment);
-      SchedulePaintInRect(gfx::Rect(callout_bounds.size()));
-    }
-  }
-
- private:
-  void InitWidget(WmWindow* parent) {
-    views::Widget::InitParams params;
-    params.type = views::Widget::InitParams::TYPE_POPUP;
-    params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
-    params.keep_on_top = true;
-    params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
-    params.bounds = parent->ConvertRectToScreen(gfx::Rect());
-    params.bounds.set_width(kArrowWidth);
-    params.bounds.set_height(kArrowHeight);
-    params.accept_events = false;
-    parent->GetRootWindowController()->ConfigureWidgetInitParamsForContainer(
-        this, parent->GetShellWindowId(), &params);
-    set_focus_on_creation(false);
-    Init(params);
-    WmWindow* widget_window = WmWindow::Get(this->GetNativeWindow());
-    DCHECK_EQ(widget_window->GetRootWindow(), parent->GetRootWindow());
-    views::View* content_view = new views::View;
-    background_ = new CalloutWidgetBackground;
-    content_view->set_background(background_);
-    SetContentsView(content_view);
-    widget_window->GetLayer()->SetOpacity(0);
-  }
-
-  // Weak pointer owned by this widget's content view.
-  CalloutWidgetBackground* background_;
-
-  DISALLOW_COPY_AND_ASSIGN(PanelCalloutWidget);
-};
-
-views::Widget* PanelLayoutManager::PanelInfo::CalloutWidget() {
-  return callout_widget;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// PanelLayoutManager public implementation:
-PanelLayoutManager::PanelLayoutManager(WmWindow* panel_container)
-    : panel_container_(panel_container),
-      root_window_controller_(panel_container->GetRootWindowController()),
-      in_add_window_(false),
-      in_layout_(false),
-      show_callout_widgets_(true),
-      dragged_panel_(NULL),
-      shelf_(nullptr),
-      last_active_panel_(NULL),
-      weak_factory_(this) {
-  DCHECK(panel_container);
-  WmShell* shell = panel_container->GetShell();
-  shell->AddActivationObserver(this);
-  shell->AddDisplayObserver(this);
-  shell->AddShellObserver(this);
-}
-
-PanelLayoutManager::~PanelLayoutManager() {
-  Shutdown();
-}
-
-// static
-PanelLayoutManager* PanelLayoutManager::Get(WmWindow* window) {
-  if (!window)
-    return nullptr;
-
-  return static_cast<PanelLayoutManager*>(
-      window->GetRootWindow()
-          ->GetChildByShellWindowId(kShellWindowId_PanelContainer)
-          ->GetLayoutManager());
-}
-
-void PanelLayoutManager::Shutdown() {
-  if (shelf_) {
-    shelf_->RemoveObserver(this);
-    shelf_ = nullptr;
-  }
-  for (PanelList::iterator iter = panel_windows_.begin();
-       iter != panel_windows_.end(); ++iter) {
-    delete iter->callout_widget;
-  }
-  panel_windows_.clear();
-  WmShell* shell = panel_container_->GetShell();
-  shell->RemoveActivationObserver(this);
-  shell->RemoveDisplayObserver(this);
-  shell->RemoveShellObserver(this);
-}
-
-void PanelLayoutManager::StartDragging(WmWindow* panel) {
-  DCHECK(!dragged_panel_);
-  dragged_panel_ = panel;
-  Relayout();
-}
-
-void PanelLayoutManager::FinishDragging() {
-  dragged_panel_ = NULL;
-  Relayout();
-}
-
-void PanelLayoutManager::SetShelf(WmShelf* shelf) {
-  DCHECK(!shelf_);
-  shelf_ = shelf;
-  shelf_->AddObserver(this);
-  WillChangeVisibilityState(shelf_->GetVisibilityState());
-}
-
-void PanelLayoutManager::ToggleMinimize(WmWindow* panel) {
-  DCHECK(panel->GetParent() == panel_container_);
-  wm::WindowState* window_state = panel->GetWindowState();
-  if (window_state->IsMinimized())
-    window_state->Restore();
-  else
-    window_state->Minimize();
-}
-
-void PanelLayoutManager::SetShowCalloutWidgets(bool show) {
-  if (show_callout_widgets_ == show)
-    return;
-  show_callout_widgets_ = show;
-  UpdateCallouts();
-}
-
-views::Widget* PanelLayoutManager::GetCalloutWidgetForPanel(WmWindow* panel) {
-  DCHECK(panel->GetParent() == panel_container_);
-  PanelList::iterator found =
-      std::find(panel_windows_.begin(), panel_windows_.end(), panel);
-  DCHECK(found != panel_windows_.end());
-  return found->callout_widget;
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// PanelLayoutManager, WmLayoutManager implementation:
-void PanelLayoutManager::OnWindowResized() {
-  Relayout();
-}
-
-void PanelLayoutManager::OnWindowAddedToLayout(WmWindow* child) {
-  if (child->GetType() == ui::wm::WINDOW_TYPE_POPUP)
-    return;
-  if (in_add_window_)
-    return;
-  base::AutoReset<bool> auto_reset_in_add_window(&in_add_window_, true);
-  if (!child->aura_window()->GetProperty(kPanelAttachedKey)) {
-    // This should only happen when a window is added to panel container as a
-    // result of bounds change from within the application during a drag.
-    // If so we have already stopped the drag and should reparent the panel
-    // back to appropriate container and ignore it.
-    // TODO(varkha): Updating bounds during a drag can cause problems and a more
-    // general solution is needed. See http://crbug.com/251813 .
-    WmWindow* old_parent = child->GetParent();
-    child->SetParentUsingContext(child,
-                                 child->GetRootWindow()->GetBoundsInScreen());
-    wm::ReparentTransientChildrenOfChild(child, old_parent, child->GetParent());
-    DCHECK(child->GetParent()->GetShellWindowId() !=
-           kShellWindowId_PanelContainer);
-    return;
-  }
-  PanelInfo panel_info;
-  panel_info.window = child;
-  panel_info.callout_widget = new PanelCalloutWidget(panel_container_);
-  panel_info.slide_in = child != dragged_panel_;
-  panel_windows_.push_back(panel_info);
-  child->aura_window()->AddObserver(this);
-  child->GetWindowState()->AddObserver(this);
-  Relayout();
-}
-
-void PanelLayoutManager::OnWillRemoveWindowFromLayout(WmWindow* child) {}
-
-void PanelLayoutManager::OnWindowRemovedFromLayout(WmWindow* child) {
-  if (child->GetType() == ui::wm::WINDOW_TYPE_POPUP)
-    return;
-
-  PanelList::iterator found =
-      std::find(panel_windows_.begin(), panel_windows_.end(), child);
-  if (found != panel_windows_.end()) {
-    delete found->callout_widget;
-    panel_windows_.erase(found);
-  }
-  if (restore_windows_on_shelf_visible_)
-    restore_windows_on_shelf_visible_->Remove(child->aura_window());
-  child->aura_window()->RemoveObserver(this);
-  child->GetWindowState()->RemoveObserver(this);
-
-  if (dragged_panel_ == child)
-    dragged_panel_ = NULL;
-
-  if (last_active_panel_ == child)
-    last_active_panel_ = NULL;
-
-  Relayout();
-}
-
-void PanelLayoutManager::OnChildWindowVisibilityChanged(WmWindow* child,
-                                                        bool visible) {
-  if (visible)
-    child->GetWindowState()->Restore();
-  Relayout();
-}
-
-void PanelLayoutManager::SetChildBounds(WmWindow* child,
-                                        const gfx::Rect& requested_bounds) {
-  gfx::Rect bounds(requested_bounds);
-  const gfx::Rect& max_bounds = panel_container_->GetRootWindow()->GetBounds();
-  const int max_width = max_bounds.width() * kMaxWidthFactor;
-  const int max_height = max_bounds.height() * kMaxHeightFactor;
-  if (bounds.width() > max_width)
-    bounds.set_width(max_width);
-  if (bounds.height() > max_height)
-    bounds.set_height(max_height);
-
-  // Reposition dragged panel in the panel order.
-  if (dragged_panel_ == child) {
-    PanelList::iterator dragged_panel_iter =
-        std::find(panel_windows_.begin(), panel_windows_.end(), dragged_panel_);
-    DCHECK(dragged_panel_iter != panel_windows_.end());
-    PanelList::iterator new_position;
-    for (new_position = panel_windows_.begin();
-         new_position != panel_windows_.end(); ++new_position) {
-      const gfx::Rect& bounds = (*new_position).window->GetBounds();
-      if (bounds.x() + bounds.width() / 2 <= requested_bounds.x())
-        break;
-    }
-    if (new_position != dragged_panel_iter) {
-      PanelInfo dragged_panel_info = *dragged_panel_iter;
-      panel_windows_.erase(dragged_panel_iter);
-      panel_windows_.insert(new_position, dragged_panel_info);
-    }
-  }
-  // Respect the minimum size of the window.
-  if (child->HasNonClientArea()) {
-    const gfx::Size min_size = child->GetMinimumSize();
-    bounds.set_width(std::max(min_size.width(), bounds.width()));
-    bounds.set_height(std::max(min_size.height(), bounds.height()));
-  }
-
-  child->SetBoundsDirect(bounds);
-  Relayout();
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// PanelLayoutManager, ShellObserver implementation:
-
-void PanelLayoutManager::OnOverviewModeEnded() {
-  Relayout();
-}
-
-void PanelLayoutManager::OnShelfAlignmentChanged(WmWindow* root_window) {
-  if (root_window_controller_->GetWindow() == root_window)
-    Relayout();
-}
-
-/////////////////////////////////////////////////////////////////////////////
-// PanelLayoutManager, WindowObserver implementation:
-
-void PanelLayoutManager::OnWindowPropertyChanged(aura::Window* window,
-                                                 const void* key,
-                                                 intptr_t old) {
-  // Trigger a relayout to position the panels whenever the panel icon is set
-  // or changes.
-  if (key == kShelfIDKey)
-    Relayout();
-}
-
-/////////////////////////////////////////////////////////////////////////////
-// PanelLayoutManager, WindowStateObserver implementation:
-
-void PanelLayoutManager::OnPostWindowStateTypeChange(
-    wm::WindowState* window_state,
-    wm::WindowStateType old_type) {
-  // If the shelf is currently hidden then windows will not actually be shown
-  // but the set to restore when the shelf becomes visible is updated.
-  if (restore_windows_on_shelf_visible_) {
-    if (window_state->IsMinimized()) {
-      MinimizePanel(window_state->window());
-      restore_windows_on_shelf_visible_->Remove(
-          window_state->window()->aura_window());
-    } else {
-      restore_windows_on_shelf_visible_->Add(
-          window_state->window()->aura_window());
-    }
-    return;
-  }
-
-  if (window_state->IsMinimized())
-    MinimizePanel(window_state->window());
-  else
-    RestorePanel(window_state->window());
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// PanelLayoutManager, WmActivationObserver implementation:
-
-void PanelLayoutManager::OnWindowActivated(WmWindow* gained_active,
-                                           WmWindow* lost_active) {
-  // Ignore if the panel that is not managed by this was activated.
-  if (gained_active && gained_active->GetType() == ui::wm::WINDOW_TYPE_PANEL &&
-      gained_active->GetParent() == panel_container_) {
-    UpdateStacking(gained_active);
-    UpdateCallouts();
-  }
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// PanelLayoutManager, WmDisplayObserver::Observer implementation:
-
-void PanelLayoutManager::OnDisplayConfigurationChanged() {
-  Relayout();
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// PanelLayoutManager, ShelfLayoutManagerObserver implementation:
-
-void PanelLayoutManager::WillChangeVisibilityState(
-    ShelfVisibilityState new_state) {
-  // On entering / leaving full screen mode the shelf visibility state is
-  // changed to / from SHELF_HIDDEN. In this state, panel windows should hide
-  // to allow the full-screen application to use the full screen.
-  bool shelf_hidden = new_state == ash::SHELF_HIDDEN;
-  if (!shelf_hidden) {
-    if (restore_windows_on_shelf_visible_) {
-      std::unique_ptr<aura::WindowTracker> restore_windows(
-          std::move(restore_windows_on_shelf_visible_));
-      for (aura::Window* window : restore_windows->windows())
-        RestorePanel(WmWindow::Get(window));
-    }
-    return;
-  }
-
-  if (restore_windows_on_shelf_visible_)
-    return;
-  std::unique_ptr<aura::WindowTracker> minimized_windows(
-      new aura::WindowTracker);
-  for (PanelList::iterator iter = panel_windows_.begin();
-       iter != panel_windows_.end();) {
-    WmWindow* window = iter->window;
-    // Minimizing a panel window may remove it from the panel_windows_ list.
-    // Advance the iterator before minimizing it: http://crbug.com/393047.
-    ++iter;
-    if (window != dragged_panel_ && window->IsVisible()) {
-      minimized_windows->Add(window->aura_window());
-      window->GetWindowState()->Minimize();
-    }
-  }
-  restore_windows_on_shelf_visible_ = std::move(minimized_windows);
-}
-
-void PanelLayoutManager::OnShelfIconPositionsChanged() {
-  // TODO: As this is called for every animation step now. Relayout needs to be
-  // updated to use current icon position instead of use the ideal bounds so
-  // that the panels slide with their icons instead of jumping.
-  Relayout();
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// PanelLayoutManager private implementation:
-
-void PanelLayoutManager::MinimizePanel(WmWindow* panel) {
-  // Clusterfuzz can trigger panel accelerators before the shelf is created.
-  // TODO(jamescook): Revert this after http://crbug.com/648964 is fixed.
-  if (!shelf_)
-    return;
-
-  panel->SetVisibilityAnimationType(
-      wm::WINDOW_VISIBILITY_ANIMATION_TYPE_MINIMIZE);
-  ui::Layer* layer = panel->GetLayer();
-  ui::ScopedLayerAnimationSettings panel_slide_settings(layer->GetAnimator());
-  panel_slide_settings.SetPreemptionStrategy(
-      ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
-  panel_slide_settings.SetTransitionDuration(
-      base::TimeDelta::FromMilliseconds(kPanelSlideDurationMilliseconds));
-  gfx::Rect bounds(panel->GetBounds());
-  bounds.Offset(GetSlideInAnimationOffset(shelf_->GetAlignment()));
-  panel->SetBoundsDirect(bounds);
-  panel->Hide();
-  layer->SetOpacity(0);
-  if (panel->IsActive())
-    panel->Deactivate();
-  Relayout();
-}
-
-void PanelLayoutManager::RestorePanel(WmWindow* panel) {
-  PanelList::iterator found =
-      std::find(panel_windows_.begin(), panel_windows_.end(), panel);
-  DCHECK(found != panel_windows_.end());
-  found->slide_in = true;
-  Relayout();
-}
-
-void PanelLayoutManager::Relayout() {
-  if (!shelf_ || !shelf_->GetWindow())
-    return;
-
-  // Suppress layouts during overview mode because changing window bounds
-  // interfered with overview mode animations. However, layouts need to be done
-  // when the WindowSelectorController is restoring minimized windows so that
-  // they actually become visible.
-  WindowSelectorController* window_selector_controller =
-      WmShell::Get()->window_selector_controller();
-  if (in_layout_ ||
-      (window_selector_controller->IsSelecting() &&
-       !window_selector_controller->IsRestoringMinimizedWindows())) {
-    return;
-  }
-
-  base::AutoReset<bool> auto_reset_in_layout(&in_layout_, true);
-
-  const ShelfAlignment alignment = shelf_->GetAlignment();
-  const bool horizontal = shelf_->IsHorizontalAlignment();
-  gfx::Rect shelf_bounds = panel_container_->ConvertRectFromScreen(
-      shelf_->GetWindow()->GetBoundsInScreen());
-  int panel_start_bounds = kPanelIdealSpacing;
-  int panel_end_bounds =
-      horizontal ? panel_container_->GetBounds().width() - kPanelIdealSpacing
-                 : panel_container_->GetBounds().height() - kPanelIdealSpacing;
-  WmWindow* active_panel = nullptr;
-  std::vector<VisiblePanelPositionInfo> visible_panels;
-  for (PanelList::iterator iter = panel_windows_.begin();
-       iter != panel_windows_.end(); ++iter) {
-    WmWindow* panel = iter->window;
-    iter->callout_widget->SetAlignment(alignment);
-
-    // Consider the dragged panel as part of the layout as long as it is
-    // touching the shelf.
-    if ((!panel->IsVisible() && !iter->slide_in) ||
-        (panel == dragged_panel_ &&
-         !BoundsAdjacent(panel->GetBounds(), shelf_bounds))) {
-      continue;
-    }
-
-    // If the shelf is currently hidden (full-screen mode), minimize panel until
-    // full-screen mode is exited. When a panel is dragged from another display
-    // the shelf state does not update before the panel is added so we exclude
-    // the dragged panel.
-    if (panel != dragged_panel_ && restore_windows_on_shelf_visible_) {
-      panel->GetWindowState()->Minimize();
-      restore_windows_on_shelf_visible_->Add(panel->aura_window());
-      continue;
-    }
-
-    gfx::Rect icon_bounds = shelf_->GetScreenBoundsOfItemIconForWindow(panel);
-
-    // If both the icon width and height are 0 then there is no icon in the
-    // shelf. If the shelf is hidden, one of the height or width will be
-    // 0 but the position in the shelf and major dimension is still reported
-    // correctly and the panel can be aligned above where the hidden icon is.
-    if (icon_bounds.width() == 0 && icon_bounds.height() == 0)
-      continue;
-
-    if (panel->IsFocused() ||
-        panel->Contains(panel->GetShell()->GetFocusedWindow())) {
-      DCHECK(!active_panel);
-      active_panel = panel;
-    }
-    icon_bounds = panel_container_->ConvertRectFromScreen(icon_bounds);
-    gfx::Point icon_origin = icon_bounds.origin();
-    VisiblePanelPositionInfo position_info;
-    int icon_start = horizontal ? icon_origin.x() : icon_origin.y();
-    int icon_end =
-        icon_start + (horizontal ? icon_bounds.width() : icon_bounds.height());
-    position_info.major_length =
-        horizontal ? panel->GetBounds().width() : panel->GetBounds().height();
-    position_info.min_major =
-        std::max(panel_start_bounds + position_info.major_length / 2,
-                 icon_end - position_info.major_length / 2);
-    position_info.max_major =
-        std::min(icon_start + position_info.major_length / 2,
-                 panel_end_bounds - position_info.major_length / 2);
-    position_info.major_pos = (icon_start + icon_end) / 2;
-    position_info.window = panel;
-    position_info.slide_in = iter->slide_in;
-    iter->slide_in = false;
-    visible_panels.push_back(position_info);
-  }
-
-  // Sort panels by their X positions and fan out groups of overlapping panels.
-  // The fan out method may result in new overlapping panels however given that
-  // the panels start at least a full panel width apart this overlap will
-  // never completely obscure a panel.
-  // TODO(flackr): Rearrange panels if new overlaps are introduced.
-  std::sort(visible_panels.begin(), visible_panels.end(), CompareWindowMajor);
-  size_t first_overlapping_panel = 0;
-  for (size_t i = 1; i < visible_panels.size(); ++i) {
-    if (visible_panels[i - 1].major_pos +
-            visible_panels[i - 1].major_length / 2 <
-        visible_panels[i].major_pos - visible_panels[i].major_length / 2) {
-      FanOutPanels(visible_panels.begin() + first_overlapping_panel,
-                   visible_panels.begin() + i);
-      first_overlapping_panel = i;
-    }
-  }
-  FanOutPanels(visible_panels.begin() + first_overlapping_panel,
-               visible_panels.end());
-
-  for (size_t i = 0; i < visible_panels.size(); ++i) {
-    if (visible_panels[i].window == dragged_panel_)
-      continue;
-    bool slide_in = visible_panels[i].slide_in;
-    gfx::Rect bounds = visible_panels[i].window->GetTargetBounds();
-    if (alignment == SHELF_ALIGNMENT_LEFT)
-      bounds.set_x(shelf_bounds.right());
-    else if (alignment == SHELF_ALIGNMENT_RIGHT)
-      bounds.set_x(shelf_bounds.x() - bounds.width());
-    else
-      bounds.set_y(shelf_bounds.y() - bounds.height());
-    bool on_shelf = visible_panels[i].window->GetTargetBounds() == bounds;
-
-    if (horizontal) {
-      bounds.set_x(visible_panels[i].major_pos -
-                   visible_panels[i].major_length / 2);
-    } else {
-      bounds.set_y(visible_panels[i].major_pos -
-                   visible_panels[i].major_length / 2);
-    }
-
-    ui::Layer* layer = visible_panels[i].window->GetLayer();
-    if (slide_in) {
-      // New windows shift up from the shelf into position and fade in.
-      layer->SetOpacity(0);
-      gfx::Rect initial_bounds(bounds);
-      initial_bounds.Offset(GetSlideInAnimationOffset(alignment));
-      visible_panels[i].window->SetBoundsDirect(initial_bounds);
-      // Set on shelf so that the panel animates into its target position.
-      on_shelf = true;
-    }
-
-    if (on_shelf) {
-      ui::ScopedLayerAnimationSettings panel_slide_settings(
-          layer->GetAnimator());
-      panel_slide_settings.SetPreemptionStrategy(
-          ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
-      panel_slide_settings.SetTransitionDuration(
-          base::TimeDelta::FromMilliseconds(kPanelSlideDurationMilliseconds));
-      visible_panels[i].window->SetBoundsDirect(bounds);
-      if (slide_in) {
-        layer->SetOpacity(1);
-        visible_panels[i].window->Show();
-      }
-    } else {
-      // If the shelf moved don't animate, move immediately to the new
-      // target location.
-      visible_panels[i].window->SetBoundsDirect(bounds);
-    }
-  }
-
-  UpdateStacking(active_panel);
-  UpdateCallouts();
-}
-
-void PanelLayoutManager::UpdateStacking(WmWindow* active_panel) {
-  // Clusterfuzz can trigger panel accelerators before the shelf is created.
-  // TODO(jamescook): Revert this after http://crbug.com/648964 is fixed.
-  if (!shelf_)
-    return;
-
-  if (!active_panel) {
-    if (!last_active_panel_)
-      return;
-    active_panel = last_active_panel_;
-  }
-
-  // We want to to stack the panels like a deck of cards:
-  // ,--,--,--,-------.--.--.
-  // |  |  |  |       |  |  |
-  // |  |  |  |       |  |  |
-  //
-  // We use the middle of each panel to figure out how to stack the panels. This
-  // allows us to update the stacking when a panel is being dragged around by
-  // the titlebar--even though it doesn't update the shelf icon positions, we
-  // still want the visual effect.
-  std::map<int, WmWindow*> window_ordering;
-  const bool horizontal = shelf_->IsHorizontalAlignment();
-  for (PanelList::const_iterator it = panel_windows_.begin();
-       it != panel_windows_.end(); ++it) {
-    gfx::Rect bounds = it->window->GetBounds();
-    window_ordering.insert(
-        std::make_pair(horizontal ? bounds.x() + bounds.width() / 2
-                                  : bounds.y() + bounds.height() / 2,
-                       it->window));
-  }
-
-  WmWindow* previous_panel = nullptr;
-  for (std::map<int, WmWindow*>::const_iterator it = window_ordering.begin();
-       it != window_ordering.end() && it->second != active_panel; ++it) {
-    if (previous_panel)
-      panel_container_->StackChildAbove(it->second, previous_panel);
-    previous_panel = it->second;
-  }
-
-  previous_panel = NULL;
-  for (std::map<int, WmWindow*>::const_reverse_iterator it =
-           window_ordering.rbegin();
-       it != window_ordering.rend() && it->second != active_panel; ++it) {
-    if (previous_panel)
-      panel_container_->StackChildAbove(it->second, previous_panel);
-    previous_panel = it->second;
-  }
-
-  panel_container_->StackChildAtTop(active_panel);
-  if (dragged_panel_ && dragged_panel_->GetParent() == panel_container_)
-    panel_container_->StackChildAtTop(dragged_panel_);
-  last_active_panel_ = active_panel;
-}
-
-void PanelLayoutManager::UpdateCallouts() {
-  // Clusterfuzz can trigger panel accelerators before the shelf is created.
-  // TODO(jamescook): Revert this after http://crbug.com/648964 is fixed.
-  if (!shelf_)
-    return;
-
-  const bool horizontal = shelf_->IsHorizontalAlignment();
-  for (PanelList::iterator iter = panel_windows_.begin();
-       iter != panel_windows_.end(); ++iter) {
-    WmWindow* panel = iter->window;
-    views::Widget* callout_widget = iter->callout_widget;
-    WmWindow* callout_widget_window =
-        WmWindow::Get(callout_widget->GetNativeWindow());
-
-    gfx::Rect current_bounds = panel->GetBoundsInScreen();
-    gfx::Rect bounds =
-        panel->GetParent()->ConvertRectToScreen(panel->GetTargetBounds());
-    gfx::Rect icon_bounds = shelf_->GetScreenBoundsOfItemIconForWindow(panel);
-    if (icon_bounds.IsEmpty() || !panel->GetLayer()->GetTargetVisibility() ||
-        panel == dragged_panel_ || !show_callout_widgets_) {
-      callout_widget->Hide();
-      callout_widget_window->GetLayer()->SetOpacity(0);
-      continue;
-    }
-
-    gfx::Rect callout_bounds = callout_widget->GetWindowBoundsInScreen();
-    gfx::Vector2d slide_vector = bounds.origin() - current_bounds.origin();
-    int slide_distance = horizontal ? slide_vector.x() : slide_vector.y();
-    int distance_until_over_panel = 0;
-    if (horizontal) {
-      callout_bounds.set_x(icon_bounds.x() +
-                           (icon_bounds.width() - callout_bounds.width()) / 2);
-      distance_until_over_panel =
-          std::max(current_bounds.x() - callout_bounds.x(),
-                   callout_bounds.right() - current_bounds.right());
-    } else {
-      callout_bounds.set_y(icon_bounds.y() +
-                           (icon_bounds.height() - callout_bounds.height()) /
-                               2);
-      distance_until_over_panel =
-          std::max(current_bounds.y() - callout_bounds.y(),
-                   callout_bounds.bottom() - current_bounds.bottom());
-    }
-    if (shelf_->GetAlignment() == SHELF_ALIGNMENT_LEFT)
-      callout_bounds.set_x(bounds.x() - callout_bounds.width());
-    else if (shelf_->GetAlignment() == SHELF_ALIGNMENT_RIGHT)
-      callout_bounds.set_x(bounds.right());
-    else
-      callout_bounds.set_y(bounds.bottom());
-    callout_bounds = callout_widget_window->GetParent()->ConvertRectFromScreen(
-        callout_bounds);
-
-    callout_widget_window->SetBoundsDirect(callout_bounds);
-    DCHECK_EQ(panel_container_, callout_widget_window->GetParent());
-    DCHECK_EQ(panel_container_, panel->GetParent());
-    panel_container_->StackChildAbove(callout_widget_window, panel);
-
-    ui::Layer* layer = callout_widget_window->GetLayer();
-    // If the panel is not over the callout position or has just become visible
-    // then fade in the callout.
-    if ((distance_until_over_panel > 0 || layer->GetTargetOpacity() < 1)) {
-      if (distance_until_over_panel > 0 &&
-          slide_distance >= distance_until_over_panel) {
-        // If the panel is not yet over the callout, then delay fading in
-        // the callout until after the panel should be over it.
-        int delay = kPanelSlideDurationMilliseconds *
-                    distance_until_over_panel / slide_distance;
-        layer->SetOpacity(0);
-        layer->GetAnimator()->StopAnimating();
-        layer->GetAnimator()->SchedulePauseForProperties(
-            base::TimeDelta::FromMilliseconds(delay),
-            ui::LayerAnimationElement::OPACITY);
-      }
-      ui::ScopedLayerAnimationSettings callout_settings(layer->GetAnimator());
-      callout_settings.SetPreemptionStrategy(
-          ui::LayerAnimator::REPLACE_QUEUED_ANIMATIONS);
-      callout_settings.SetTransitionDuration(
-          base::TimeDelta::FromMilliseconds(kCalloutFadeDurationMilliseconds));
-      layer->SetOpacity(1);
-    }
-
-    // Show after changing the opacity animation. This way we don't have a
-    // state where the widget is visible but the opacity is 0.
-    callout_widget->Show();
-  }
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// keyboard::KeyboardControllerObserver implementation:
-
-void PanelLayoutManager::OnKeyboardBoundsChanging(
-    const gfx::Rect& keyboard_bounds) {
-  gfx::Rect parent_bounds = panel_container_->GetBounds();
-  int available_space = parent_bounds.height() - keyboard_bounds.height();
-  for (PanelList::iterator iter = panel_windows_.begin();
-       iter != panel_windows_.end(); ++iter) {
-    WmWindow* panel = iter->window;
-    wm::WindowState* panel_state = panel->GetWindowState();
-    if (keyboard_bounds.height() > 0) {
-      // Save existing bounds, so that we can restore them when the keyboard
-      // hides.
-      panel_state->SaveCurrentBoundsForRestore();
-
-      gfx::Rect panel_bounds =
-          panel->GetParent()->ConvertRectToScreen(panel->GetTargetBounds());
-      int delta = panel_bounds.height() - available_space;
-      // Ensure panels are not pushed above the parent boundaries, shrink any
-      // panels that violate this constraint.
-      if (delta > 0) {
-        panel->SetBoundsDirect(
-            gfx::Rect(panel_bounds.x(), panel_bounds.y() + delta,
-                      panel_bounds.width(), panel_bounds.height() - delta));
-      }
-    } else if (panel_state->HasRestoreBounds()) {
-      // Keyboard hidden, restore original bounds if they exist.
-      panel->SetBoundsDirect(panel_state->GetRestoreBoundsInScreen());
-    }
-  }
-  // This bounds change will have caused a change to the Shelf which does not
-  // propogate automatically to this class, so manually recalculate bounds.
-  OnWindowResized();
-}
-
-void PanelLayoutManager::OnKeyboardClosed() {}
-
-}  // namespace ash