ash/wm/panels/panel_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/wm/panels/panel_layout_manager.h"
   6
   7 #include <algorithm>
   8 #include <map>
   9
  10 #include "ash/screen_util.h"
  11 #include "ash/shelf/shelf.h"
  12 #include "ash/shelf/shelf_layout_manager.h"
  13 #include "ash/shelf/shelf_types.h"
  14 #include "ash/shelf/shelf_util.h"
  15 #include "ash/shelf/shelf_widget.h"
  16 #include "ash/shell.h"
  17 #include "ash/shell_window_ids.h"
  18 #include "ash/wm/overview/window_selector_controller.h"
  19 #include "ash/wm/window_animations.h"
  20 #include "ash/wm/window_state.h"
  21 #include "ash/wm/window_util.h"
  22 #include "base/auto_reset.h"
  23 #include "base/bind.h"
  24 #include "base/bind_helpers.h"
  25 #include "third_party/skia/include/core/SkColor.h"
  26 #include "third_party/skia/include/core/SkPaint.h"
  27 #include "third_party/skia/include/core/SkPath.h"
  28 #include "ui/aura/client/focus_client.h"
  29 #include "ui/aura/client/window_tree_client.h"
  30 #include "ui/aura/window.h"
  31 #include "ui/aura/window_delegate.h"
  32 #include "ui/aura/window_event_dispatcher.h"
  33 #include "ui/aura/window_tracker.h"
  34 #include "ui/compositor/scoped_layer_animation_settings.h"
  35 #include "ui/gfx/canvas.h"
  36 #include "ui/gfx/geometry/rect.h"
  37 #include "ui/gfx/geometry/vector2d.h"
  38 #include "ui/views/background.h"
  39 #include "ui/views/widget/widget.h"
  40 #include "ui/wm/public/activation_client.h"
  41
  42 namespace ash {
  43 namespace {
  44
  45 const int kPanelIdealSpacing = 4;
  46
  47 const float kMaxHeightFactor = .80f;
  48 const float kMaxWidthFactor = .50f;
  49
  50 // Duration for panel animations.
  51 const int kPanelSlideDurationMilliseconds = 50;
  52 const int kCalloutFadeDurationMilliseconds = 50;
  53
  54 // Offset used when sliding panel in/out of the shelf. Used for minimizing,
  55 // restoring and the initial showing of a panel.
  56 const int kPanelSlideInOffset = 20;
  57
  58 // Callout arrow dimensions.
  59 const int kArrowWidth = 18;
  60 const int kArrowHeight = 9;
  61
  62 class CalloutWidgetBackground : public views::Background {
  63  public:
  64   CalloutWidgetBackground() : alignment_(SHELF_ALIGNMENT_BOTTOM) {
  65   }
  66
  67   void Paint(gfx::Canvas* canvas, views::View* view) const override {
  68     SkPath path;
  69     switch (alignment_) {
  70       case SHELF_ALIGNMENT_BOTTOM:
  71         path.moveTo(SkIntToScalar(0), SkIntToScalar(0));
  72         path.lineTo(SkIntToScalar(kArrowWidth / 2),
  73                     SkIntToScalar(kArrowHeight));
  74         path.lineTo(SkIntToScalar(kArrowWidth), SkIntToScalar(0));
  75         break;
  76       case SHELF_ALIGNMENT_LEFT:
  77         path.moveTo(SkIntToScalar(kArrowHeight), SkIntToScalar(kArrowWidth));
  78         path.lineTo(SkIntToScalar(0), SkIntToScalar(kArrowWidth / 2));
  79         path.lineTo(SkIntToScalar(kArrowHeight), SkIntToScalar(0));
  80         break;
  81       case SHELF_ALIGNMENT_TOP:
  82         path.moveTo(SkIntToScalar(0), SkIntToScalar(kArrowHeight));
  83         path.lineTo(SkIntToScalar(kArrowWidth / 2), SkIntToScalar(0));
  84         path.lineTo(SkIntToScalar(kArrowWidth), SkIntToScalar(kArrowHeight));
  85         break;
  86       case SHELF_ALIGNMENT_RIGHT:
  87         path.moveTo(SkIntToScalar(0), SkIntToScalar(0));
  88         path.lineTo(SkIntToScalar(kArrowHeight),
  89                     SkIntToScalar(kArrowWidth / 2));
  90         path.lineTo(SkIntToScalar(0), SkIntToScalar(kArrowWidth));
  91         break;
  92     }
  93     // Hard code the arrow color for now.
  94     SkPaint paint;
  95     paint.setStyle(SkPaint::kFill_Style);
  96     paint.setColor(SkColorSetARGB(0xff, 0xe5, 0xe5, 0xe5));
  97     canvas->DrawPath(path, paint);
  98   }
  99
 100   ShelfAlignment alignment() {
 101     return alignment_;
 102   }
 103
 104   void set_alignment(ShelfAlignment alignment) {
 105     alignment_ = alignment;
 106   }
 107
 108  private:
 109   ShelfAlignment alignment_;
 110
 111   DISALLOW_COPY_AND_ASSIGN(CalloutWidgetBackground);
 112 };
 113
 114 struct VisiblePanelPositionInfo {
 115   VisiblePanelPositionInfo()
 116       : min_major(0),
 117         max_major(0),
 118         major_pos(0),
 119         major_length(0),
 120         window(NULL),
 121         slide_in(false) {}
 122
 123   int min_major;
 124   int max_major;
 125   int major_pos;
 126   int major_length;
 127   aura::Window* window;
 128   bool slide_in;
 129 };
 130
 131 bool CompareWindowMajor(const VisiblePanelPositionInfo& win1,
 132                         const VisiblePanelPositionInfo& win2) {
 133   return win1.major_pos < win2.major_pos;
 134 }
 135
 136 void FanOutPanels(std::vector<VisiblePanelPositionInfo>::iterator first,
 137                   std::vector<VisiblePanelPositionInfo>::iterator last) {
 138   int num_panels = last - first;
 139   if (num_panels == 1) {
 140     (*first).major_pos = std::max((*first).min_major, std::min(
 141         (*first).max_major, (*first).major_pos));
 142   }
 143   if (num_panels <= 1)
 144     return;
 145
 146   if (num_panels == 2) {
 147     // If there are two adjacent overlapping windows, separate them by the
 148     // minimum major_length necessary.
 149     std::vector<VisiblePanelPositionInfo>::iterator second = first + 1;
 150     int separation = (*first).major_length / 2 + (*second).major_length / 2 +
 151                      kPanelIdealSpacing;
 152     int overlap = (*first).major_pos + separation - (*second).major_pos;
 153     (*first).major_pos = std::max((*first).min_major,
 154                                   (*first).major_pos - overlap / 2);
 155     (*second).major_pos = std::min((*second).max_major,
 156                                    (*first).major_pos + separation);
 157     // Recalculate the first panel position in case the second one was
 158     // constrained on the right.
 159     (*first).major_pos = std::max((*first).min_major,
 160                                   (*second).major_pos - separation);
 161     return;
 162   }
 163
 164   // If there are more than two overlapping windows, fan them out from minimum
 165   // position to maximum position equally spaced.
 166   int delta = ((*(last - 1)).max_major - (*first).min_major) / (num_panels - 1);
 167   int major_pos = (*first).min_major;
 168   for (std::vector<VisiblePanelPositionInfo>::iterator iter = first;
 169       iter != last; ++iter) {
 170     (*iter).major_pos = std::max((*iter).min_major,
 171                                  std::min((*iter).max_major, major_pos));
 172     major_pos += delta;
 173   }
 174 }
 175
 176 bool BoundsAdjacent(const gfx::Rect& bounds1, const gfx::Rect& bounds2) {
 177   return bounds1.x() == bounds2.right() ||
 178          bounds1.y() == bounds2.bottom() ||
 179          bounds1.right() == bounds2.x() ||
 180          bounds1.bottom() == bounds2.y();
 181 }
 182
 183 gfx::Vector2d GetSlideInAnimationOffset(ShelfAlignment alignment) {
 184   gfx::Vector2d offset;
 185   switch (alignment) {
 186     case SHELF_ALIGNMENT_BOTTOM:
 187       offset.set_y(kPanelSlideInOffset);
 188       break;
 189     case SHELF_ALIGNMENT_LEFT:
 190       offset.set_x(-kPanelSlideInOffset);
 191       break;
 192     case SHELF_ALIGNMENT_RIGHT:
 193       offset.set_x(kPanelSlideInOffset);
 194       break;
 195     case SHELF_ALIGNMENT_TOP:
 196       offset.set_y(-kPanelSlideInOffset);
 197       break;
 198   }
 199   return offset;
 200 }
 201
 202 }  // namespace
 203
 204 class PanelCalloutWidget : public views::Widget {
 205  public:
 206   explicit PanelCalloutWidget(aura::Window* container)
 207       : background_(NULL) {
 208     InitWidget(container);
 209   }
 210
 211   void SetAlignment(ShelfAlignment alignment) {
 212     gfx::Rect callout_bounds = GetWindowBoundsInScreen();
 213     if (alignment == SHELF_ALIGNMENT_BOTTOM ||
 214         alignment == SHELF_ALIGNMENT_TOP) {
 215       callout_bounds.set_width(kArrowWidth);
 216       callout_bounds.set_height(kArrowHeight);
 217     } else {
 218       callout_bounds.set_width(kArrowHeight);
 219       callout_bounds.set_height(kArrowWidth);
 220     }
 221     GetNativeWindow()->SetBounds(callout_bounds);
 222     if (background_->alignment() != alignment) {
 223       background_->set_alignment(alignment);
 224       SchedulePaintInRect(gfx::Rect(gfx::Point(), callout_bounds.size()));
 225     }
 226   }
 227
 228  private:
 229   void InitWidget(aura::Window* parent) {
 230     views::Widget::InitParams params;
 231     params.type = views::Widget::InitParams::TYPE_POPUP;
 232     params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
 233     params.keep_on_top = true;
 234     params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
 235     params.parent = parent;
 236     params.bounds = ScreenUtil::ConvertRectToScreen(parent, gfx::Rect());
 237     params.bounds.set_width(kArrowWidth);
 238     params.bounds.set_height(kArrowHeight);
 239     params.accept_events = false;
 240     set_focus_on_creation(false);
 241     Init(params);
 242     DCHECK_EQ(GetNativeView()->GetRootWindow(), parent->GetRootWindow());
 243     views::View* content_view = new views::View;
 244     background_ = new CalloutWidgetBackground;
 245     content_view->set_background(background_);
 246     SetContentsView(content_view);
 247     GetNativeWindow()->layer()->SetOpacity(0);
 248   }
 249
 250   // Weak pointer owned by this widget's content view.
 251   CalloutWidgetBackground* background_;
 252
 253   DISALLOW_COPY_AND_ASSIGN(PanelCalloutWidget);
 254 };
 255
 256 ////////////////////////////////////////////////////////////////////////////////
 257 // PanelLayoutManager public implementation:
 258 PanelLayoutManager::PanelLayoutManager(aura::Window* panel_container)
 259     : panel_container_(panel_container),
 260       in_add_window_(false),
 261       in_layout_(false),
 262       show_callout_widgets_(true),
 263       dragged_panel_(NULL),
 264       shelf_(NULL),
 265       shelf_layout_manager_(NULL),
 266       last_active_panel_(NULL),
 267       weak_factory_(this) {
 268   DCHECK(panel_container);
 269   aura::client::GetActivationClient(Shell::GetPrimaryRootWindow())->
 270       AddObserver(this);
 271   Shell::GetInstance()->display_controller()->AddObserver(this);
 272   Shell::GetInstance()->AddShellObserver(this);
 273 }
 274
 275 PanelLayoutManager::~PanelLayoutManager() {
 276   Shutdown();
 277 }
 278
 279 void PanelLayoutManager::Shutdown() {
 280   if (shelf_layout_manager_)
 281     shelf_layout_manager_->RemoveObserver(this);
 282   shelf_layout_manager_ = NULL;
 283   for (PanelList::iterator iter = panel_windows_.begin();
 284        iter != panel_windows_.end(); ++iter) {
 285     delete iter->callout_widget;
 286   }
 287   panel_windows_.clear();
 288   if (shelf_)
 289     shelf_->RemoveIconObserver(this);
 290   shelf_ = NULL;
 291   aura::client::GetActivationClient(Shell::GetPrimaryRootWindow())->
 292       RemoveObserver(this);
 293   Shell::GetInstance()->display_controller()->RemoveObserver(this);
 294   Shell::GetInstance()->RemoveShellObserver(this);
 295 }
 296
 297 void PanelLayoutManager::StartDragging(aura::Window* panel) {
 298   DCHECK(!dragged_panel_);
 299   dragged_panel_ = panel;
 300   Relayout();
 301 }
 302
 303 void PanelLayoutManager::FinishDragging() {
 304   dragged_panel_ = NULL;
 305   Relayout();
 306 }
 307
 308 void PanelLayoutManager::SetShelf(Shelf* shelf) {
 309   DCHECK(!shelf_);
 310   DCHECK(!shelf_layout_manager_);
 311   shelf_ = shelf;
 312   shelf_->AddIconObserver(this);
 313   if (shelf_->shelf_widget()) {
 314     shelf_layout_manager_ = ash::ShelfLayoutManager::ForShelf(
 315         shelf_->shelf_widget()->GetNativeWindow());
 316     WillChangeVisibilityState(shelf_layout_manager_->visibility_state());
 317     shelf_layout_manager_->AddObserver(this);
 318   }
 319 }
 320
 321 void PanelLayoutManager::ToggleMinimize(aura::Window* panel) {
 322   DCHECK(panel->parent() == panel_container_);
 323   wm::WindowState* window_state = wm::GetWindowState(panel);
 324   if (window_state->IsMinimized())
 325     window_state->Restore();
 326   else
 327     window_state->Minimize();
 328 }
 329
 330 void PanelLayoutManager::SetShowCalloutWidgets(bool show) {
 331   if (show_callout_widgets_ == show)
 332     return;
 333   show_callout_widgets_ = show;
 334   UpdateCallouts();
 335 }
 336
 337 views::Widget* PanelLayoutManager::GetCalloutWidgetForPanel(
 338     aura::Window* panel) {
 339   DCHECK(panel->parent() == panel_container_);
 340   PanelList::iterator found =
 341       std::find(panel_windows_.begin(), panel_windows_.end(), panel);
 342   DCHECK(found != panel_windows_.end());
 343   return found->callout_widget;
 344 }
 345
 346 ////////////////////////////////////////////////////////////////////////////////
 347 // PanelLayoutManager, aura::LayoutManager implementation:
 348 void PanelLayoutManager::OnWindowResized() {
 349   Relayout();
 350 }
 351
 352 void PanelLayoutManager::OnWindowAddedToLayout(aura::Window* child) {
 353   if (child->type() == ui::wm::WINDOW_TYPE_POPUP)
 354     return;
 355   if (in_add_window_)
 356     return;
 357   base::AutoReset<bool> auto_reset_in_add_window(&in_add_window_, true);
 358   if (!wm::GetWindowState(child)->panel_attached()) {
 359     // This should only happen when a window is added to panel container as a
 360     // result of bounds change from within the application during a drag.
 361     // If so we have already stopped the drag and should reparent the panel
 362     // back to appropriate container and ignore it.
 363     // TODO(varkha): Updating bounds during a drag can cause problems and a more
 364     // general solution is needed. See http://crbug.com/251813 .
 365     aura::Window* old_parent = child->parent();
 366     aura::client::ParentWindowWithContext(
 367         child, child, child->GetRootWindow()->GetBoundsInScreen());
 368     wm::ReparentTransientChildrenOfChild(child, old_parent, child->parent());
 369     DCHECK(child->parent()->id() != kShellWindowId_PanelContainer);
 370     return;
 371   }
 372   PanelInfo panel_info;
 373   panel_info.window = child;
 374   panel_info.callout_widget = new PanelCalloutWidget(panel_container_);
 375   panel_info.slide_in = child != dragged_panel_;
 376   panel_windows_.push_back(panel_info);
 377   child->AddObserver(this);
 378   wm::GetWindowState(child)->AddObserver(this);
 379   Relayout();
 380 }
 381
 382 void PanelLayoutManager::OnWillRemoveWindowFromLayout(aura::Window* child) {
 383 }
 384
 385 void PanelLayoutManager::OnWindowRemovedFromLayout(aura::Window* child) {
 386   if (child->type() == ui::wm::WINDOW_TYPE_POPUP)
 387     return;
 388   PanelList::iterator found =
 389       std::find(panel_windows_.begin(), panel_windows_.end(), child);
 390   if (found != panel_windows_.end()) {
 391     delete found->callout_widget;
 392     panel_windows_.erase(found);
 393   }
 394   if (restore_windows_on_shelf_visible_)
 395     restore_windows_on_shelf_visible_->Remove(child);
 396   child->RemoveObserver(this);
 397   wm::GetWindowState(child)->RemoveObserver(this);
 398
 399   if (dragged_panel_ == child)
 400     dragged_panel_ = NULL;
 401
 402   if (last_active_panel_ == child)
 403     last_active_panel_ = NULL;
 404
 405   Relayout();
 406 }
 407
 408 void PanelLayoutManager::OnChildWindowVisibilityChanged(aura::Window* child,
 409                                                         bool visible) {
 410   if (visible)
 411     wm::GetWindowState(child)->Restore();
 412   Relayout();
 413 }
 414
 415 void PanelLayoutManager::SetChildBounds(aura::Window* child,
 416                                         const gfx::Rect& requested_bounds) {
 417   gfx::Rect bounds(requested_bounds);
 418   const gfx::Rect& max_bounds = panel_container_->GetRootWindow()->bounds();
 419   const int max_width = max_bounds.width() * kMaxWidthFactor;
 420   const int max_height = max_bounds.height() * kMaxHeightFactor;
 421   if (bounds.width() > max_width)
 422     bounds.set_width(max_width);
 423   if (bounds.height() > max_height)
 424     bounds.set_height(max_height);
 425
 426   // Reposition dragged panel in the panel order.
 427   if (dragged_panel_ == child) {
 428     PanelList::iterator dragged_panel_iter =
 429       std::find(panel_windows_.begin(), panel_windows_.end(), dragged_panel_);
 430     DCHECK(dragged_panel_iter != panel_windows_.end());
 431     PanelList::iterator new_position;
 432     for (new_position = panel_windows_.begin();
 433          new_position != panel_windows_.end();
 434          ++new_position) {
 435       const gfx::Rect& bounds = (*new_position).window->bounds();
 436       if (bounds.x() + bounds.width()/2 <= requested_bounds.x()) break;
 437     }
 438     if (new_position != dragged_panel_iter) {
 439       PanelInfo dragged_panel_info = *dragged_panel_iter;
 440       panel_windows_.erase(dragged_panel_iter);
 441       panel_windows_.insert(new_position, dragged_panel_info);
 442     }
 443   }
 444   // Respect the minimum size of the window.
 445   if (child->delegate()) {
 446     const gfx::Size& min_size = child->delegate()->GetMinimumSize();
 447     bounds.set_width(std::max(min_size.width(), bounds.width()));
 448     bounds.set_height(std::max(min_size.height(), bounds.height()));
 449   }
 450
 451   SetChildBoundsDirect(child, bounds);
 452   Relayout();
 453 }
 454
 455 ////////////////////////////////////////////////////////////////////////////////
 456 // PanelLayoutManager, ShelfIconObserver implementation:
 457
 458 void PanelLayoutManager::OnShelfIconPositionsChanged() {
 459   // TODO: As this is called for every animation step now. Relayout needs to be
 460   // updated to use current icon position instead of use the ideal bounds so
 461   // that the panels slide with their icons instead of jumping.
 462   Relayout();
 463 }
 464
 465 ////////////////////////////////////////////////////////////////////////////////
 466 // PanelLayoutManager, ash::ShellObserver implementation:
 467
 468 void PanelLayoutManager::OnOverviewModeEnded() {
 469   Relayout();
 470 }
 471
 472 void PanelLayoutManager::OnShelfAlignmentChanged(aura::Window* root_window) {
 473   if (panel_container_->GetRootWindow() == root_window)
 474     Relayout();
 475 }
 476
 477 /////////////////////////////////////////////////////////////////////////////
 478 // PanelLayoutManager, WindowObserver implementation:
 479
 480 void PanelLayoutManager::OnWindowPropertyChanged(aura::Window* window,
 481                                                  const void* key,
 482                                                  intptr_t old) {
 483   // Trigger a relayout to position the panels whenever the panel icon is set
 484   // or changes.
 485   if (key == kShelfID)
 486     Relayout();
 487 }
 488
 489 /////////////////////////////////////////////////////////////////////////////
 490 // PanelLayoutManager, WindowStateObserver implementation:
 491
 492 void PanelLayoutManager::OnPostWindowStateTypeChange(
 493     wm::WindowState* window_state,
 494     wm::WindowStateType old_type) {
 495   // If the shelf is currently hidden then windows will not actually be shown
 496   // but the set to restore when the shelf becomes visible is updated.
 497   if (restore_windows_on_shelf_visible_) {
 498     if (window_state->IsMinimized()) {
 499       MinimizePanel(window_state->window());
 500       restore_windows_on_shelf_visible_->Remove(window_state->window());
 501     } else {
 502       restore_windows_on_shelf_visible_->Add(window_state->window());
 503     }
 504     return;
 505   }
 506
 507   if (window_state->IsMinimized())
 508     MinimizePanel(window_state->window());
 509   else
 510     RestorePanel(window_state->window());
 511 }
 512
 513 ////////////////////////////////////////////////////////////////////////////////
 514 // PanelLayoutManager, aura::client::ActivationChangeObserver implementation:
 515
 516 void PanelLayoutManager::OnWindowActivated(aura::Window* gained_active,
 517                                            aura::Window* lost_active) {
 518   // Ignore if the panel that is not managed by this was activated.
 519   if (gained_active && gained_active->type() == ui::wm::WINDOW_TYPE_PANEL &&
 520       gained_active->parent() == panel_container_) {
 521     UpdateStacking(gained_active);
 522     UpdateCallouts();
 523   }
 524 }
 525
 526 ////////////////////////////////////////////////////////////////////////////////
 527 // PanelLayoutManager, DisplayController::Observer implementation:
 528
 529 void PanelLayoutManager::OnDisplayConfigurationChanged() {
 530   Relayout();
 531 }
 532
 533 ////////////////////////////////////////////////////////////////////////////////
 534 // PanelLayoutManager, ShelfLayoutManagerObserver implementation:
 535
 536 void PanelLayoutManager::WillChangeVisibilityState(
 537     ShelfVisibilityState new_state) {
 538   // On entering / leaving full screen mode the shelf visibility state is
 539   // changed to / from SHELF_HIDDEN. In this state, panel windows should hide
 540   // to allow the full-screen application to use the full screen.
 541   bool shelf_hidden = new_state == ash::SHELF_HIDDEN;
 542   if (!shelf_hidden) {
 543     if (restore_windows_on_shelf_visible_) {
 544       scoped_ptr<aura::WindowTracker> restore_windows(
 545           restore_windows_on_shelf_visible_.Pass());
 546       for (aura::WindowTracker::Windows::const_iterator iter =
 547            restore_windows->windows().begin(); iter !=
 548            restore_windows->windows().end(); ++iter) {
 549         RestorePanel(*iter);
 550       }
 551     }
 552     return;
 553   }
 554
 555   if (restore_windows_on_shelf_visible_)
 556     return;
 557   scoped_ptr<aura::WindowTracker> minimized_windows(new aura::WindowTracker);
 558   for (PanelList::iterator iter = panel_windows_.begin();
 559        iter != panel_windows_.end();) {
 560     aura::Window* window = iter->window;
 561     // Minimizing a panel window may remove it from the panel_windows_ list.
 562     // Advance the iterator before minimizing it: http://crbug.com/393047.
 563     ++iter;
 564     if (window != dragged_panel_ && window->IsVisible()) {
 565       minimized_windows->Add(window);
 566       wm::GetWindowState(window)->Minimize();
 567     }
 568   }
 569   restore_windows_on_shelf_visible_ = minimized_windows.Pass();
 570 }
 571
 572 ////////////////////////////////////////////////////////////////////////////////
 573 // PanelLayoutManager private implementation:
 574
 575 void PanelLayoutManager::MinimizePanel(aura::Window* panel) {
 576   ::wm::SetWindowVisibilityAnimationType(
 577       panel, WINDOW_VISIBILITY_ANIMATION_TYPE_MINIMIZE);
 578   ui::Layer* layer = panel->layer();
 579   ui::ScopedLayerAnimationSettings panel_slide_settings(layer->GetAnimator());
 580   panel_slide_settings.SetPreemptionStrategy(
 581       ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
 582   panel_slide_settings.SetTransitionDuration(
 583       base::TimeDelta::FromMilliseconds(kPanelSlideDurationMilliseconds));
 584   gfx::Rect bounds(panel->bounds());
 585   bounds.Offset(GetSlideInAnimationOffset(
 586       shelf_->shelf_widget()->GetAlignment()));
 587   SetChildBoundsDirect(panel, bounds);
 588   panel->Hide();
 589   layer->SetOpacity(0);
 590   if (wm::IsActiveWindow(panel))
 591     wm::DeactivateWindow(panel);
 592   Relayout();
 593 }
 594
 595 void PanelLayoutManager::RestorePanel(aura::Window* panel) {
 596   PanelList::iterator found =
 597       std::find(panel_windows_.begin(), panel_windows_.end(), panel);
 598   DCHECK(found != panel_windows_.end());
 599   found->slide_in = true;
 600   Relayout();
 601 }
 602
 603 void PanelLayoutManager::Relayout() {
 604   if (!shelf_ || !shelf_->shelf_widget())
 605     return;
 606
 607   // Suppress layouts during overview mode because changing window bounds
 608   // interfered with overview mode animations. However, layouts need to be done
 609   // when the WindowSelectorController is restoring minimized windows so that
 610   // they actually become visible.
 611   WindowSelectorController* window_selector_controller =
 612       Shell::GetInstance()->window_selector_controller();
 613   if (in_layout_ || !window_selector_controller ||
 614       (window_selector_controller->IsSelecting() &&
 615           !window_selector_controller->IsRestoringMinimizedWindows()))
 616     return;
 617   base::AutoReset<bool> auto_reset_in_layout(&in_layout_, true);
 618
 619   ShelfAlignment alignment = shelf_->shelf_widget()->GetAlignment();
 620   bool horizontal = alignment == SHELF_ALIGNMENT_TOP ||
 621                     alignment == SHELF_ALIGNMENT_BOTTOM;
 622   gfx::Rect shelf_bounds = ash::ScreenUtil::ConvertRectFromScreen(
 623       panel_container_, shelf_->shelf_widget()->GetWindowBoundsInScreen());
 624   int panel_start_bounds = kPanelIdealSpacing;
 625   int panel_end_bounds = horizontal ?
 626       panel_container_->bounds().width() - kPanelIdealSpacing :
 627       panel_container_->bounds().height() - kPanelIdealSpacing;
 628   aura::Window* active_panel = NULL;
 629   std::vector<VisiblePanelPositionInfo> visible_panels;
 630   for (PanelList::iterator iter = panel_windows_.begin();
 631        iter != panel_windows_.end(); ++iter) {
 632     aura::Window* panel = iter->window;
 633     iter->callout_widget->SetAlignment(alignment);
 634
 635     // Consider the dragged panel as part of the layout as long as it is
 636     // touching the shelf.
 637     if ((!panel->IsVisible() && !iter->slide_in) ||
 638         (panel == dragged_panel_ &&
 639          !BoundsAdjacent(panel->bounds(), shelf_bounds))) {
 640       continue;
 641     }
 642
 643     // If the shelf is currently hidden (full-screen mode), minimize panel until
 644     // full-screen mode is exited. When a panel is dragged from another display
 645     // the shelf state does not update before the panel is added so we exclude
 646     // the dragged panel.
 647     if (panel != dragged_panel_ && restore_windows_on_shelf_visible_) {
 648       wm::GetWindowState(panel)->Minimize();
 649       restore_windows_on_shelf_visible_->Add(panel);
 650       continue;
 651     }
 652
 653     gfx::Rect icon_bounds = shelf_->GetScreenBoundsOfItemIconForWindow(panel);
 654
 655     // If both the icon width and height are 0 then there is no icon in the
 656     // shelf. If the shelf is hidden, one of the height or width will be
 657     // 0 but the position in the shelf and major dimension is still reported
 658     // correctly and the panel can be aligned above where the hidden icon is.
 659     if (icon_bounds.width() == 0 && icon_bounds.height() == 0)
 660       continue;
 661
 662     if (panel->HasFocus() ||
 663         panel->Contains(
 664             aura::client::GetFocusClient(panel)->GetFocusedWindow())) {
 665       DCHECK(!active_panel);
 666       active_panel = panel;
 667     }
 668     icon_bounds = ScreenUtil::ConvertRectFromScreen(panel_container_,
 669                                                     icon_bounds);
 670     gfx::Point icon_origin = icon_bounds.origin();
 671     VisiblePanelPositionInfo position_info;
 672     int icon_start = horizontal ? icon_origin.x() : icon_origin.y();
 673     int icon_end = icon_start + (horizontal ? icon_bounds.width() :
 674                                  icon_bounds.height());
 675     position_info.major_length = horizontal ?
 676         panel->bounds().width() : panel->bounds().height();
 677     position_info.min_major = std::max(
 678         panel_start_bounds + position_info.major_length / 2,
 679         icon_end - position_info.major_length / 2);
 680     position_info.max_major = std::min(
 681         icon_start + position_info.major_length / 2,
 682         panel_end_bounds - position_info.major_length / 2);
 683     position_info.major_pos = (icon_start + icon_end) / 2;
 684     position_info.window = panel;
 685     position_info.slide_in = iter->slide_in;
 686     iter->slide_in = false;
 687     visible_panels.push_back(position_info);
 688   }
 689
 690   // Sort panels by their X positions and fan out groups of overlapping panels.
 691   // The fan out method may result in new overlapping panels however given that
 692   // the panels start at least a full panel width apart this overlap will
 693   // never completely obscure a panel.
 694   // TODO(flackr): Rearrange panels if new overlaps are introduced.
 695   std::sort(visible_panels.begin(), visible_panels.end(), CompareWindowMajor);
 696   size_t first_overlapping_panel = 0;
 697   for (size_t i = 1; i < visible_panels.size(); ++i) {
 698     if (visible_panels[i - 1].major_pos +
 699         visible_panels[i - 1].major_length / 2 < visible_panels[i].major_pos -
 700         visible_panels[i].major_length / 2) {
 701       FanOutPanels(visible_panels.begin() + first_overlapping_panel,
 702                    visible_panels.begin() + i);
 703       first_overlapping_panel = i;
 704     }
 705   }
 706   FanOutPanels(visible_panels.begin() + first_overlapping_panel,
 707                visible_panels.end());
 708
 709   for (size_t i = 0; i < visible_panels.size(); ++i) {
 710     if (visible_panels[i].window == dragged_panel_)
 711       continue;
 712     bool slide_in = visible_panels[i].slide_in;
 713     gfx::Rect bounds = visible_panels[i].window->GetTargetBounds();
 714     switch (alignment) {
 715       case SHELF_ALIGNMENT_BOTTOM:
 716         bounds.set_y(shelf_bounds.y() - bounds.height());
 717         break;
 718       case SHELF_ALIGNMENT_LEFT:
 719         bounds.set_x(shelf_bounds.right());
 720         break;
 721       case SHELF_ALIGNMENT_RIGHT:
 722         bounds.set_x(shelf_bounds.x() - bounds.width());
 723         break;
 724       case SHELF_ALIGNMENT_TOP:
 725         bounds.set_y(shelf_bounds.bottom());
 726         break;
 727     }
 728     bool on_shelf = visible_panels[i].window->GetTargetBounds() == bounds;
 729
 730     if (horizontal) {
 731       bounds.set_x(visible_panels[i].major_pos -
 732                    visible_panels[i].major_length / 2);
 733     } else {
 734       bounds.set_y(visible_panels[i].major_pos -
 735                    visible_panels[i].major_length / 2);
 736     }
 737
 738     ui::Layer* layer = visible_panels[i].window->layer();
 739     if (slide_in) {
 740       // New windows shift up from the shelf into position and fade in.
 741       layer->SetOpacity(0);
 742       gfx::Rect initial_bounds(bounds);
 743       initial_bounds.Offset(GetSlideInAnimationOffset(alignment));
 744       SetChildBoundsDirect(visible_panels[i].window, initial_bounds);
 745       // Set on shelf so that the panel animates into its target position.
 746       on_shelf = true;
 747     }
 748
 749     if (on_shelf) {
 750       ui::ScopedLayerAnimationSettings panel_slide_settings(
 751           layer->GetAnimator());
 752       panel_slide_settings.SetPreemptionStrategy(
 753           ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
 754       panel_slide_settings.SetTransitionDuration(
 755           base::TimeDelta::FromMilliseconds(kPanelSlideDurationMilliseconds));
 756       SetChildBoundsDirect(visible_panels[i].window, bounds);
 757       if (slide_in) {
 758         layer->SetOpacity(1);
 759         visible_panels[i].window->Show();
 760       }
 761     } else {
 762       // If the shelf moved don't animate, move immediately to the new
 763       // target location.
 764       SetChildBoundsDirect(visible_panels[i].window, bounds);
 765     }
 766   }
 767
 768   UpdateStacking(active_panel);
 769   UpdateCallouts();
 770 }
 771
 772 void PanelLayoutManager::UpdateStacking(aura::Window* active_panel) {
 773   if (!active_panel) {
 774     if (!last_active_panel_)
 775       return;
 776     active_panel = last_active_panel_;
 777   }
 778
 779   ShelfAlignment alignment = shelf_->alignment();
 780   bool horizontal = alignment == SHELF_ALIGNMENT_TOP ||
 781                     alignment == SHELF_ALIGNMENT_BOTTOM;
 782
 783   // We want to to stack the panels like a deck of cards:
 784   // ,--,--,--,-------.--.--.
 785   // |  |  |  |       |  |  |
 786   // |  |  |  |       |  |  |
 787   //
 788   // We use the middle of each panel to figure out how to stack the panels. This
 789   // allows us to update the stacking when a panel is being dragged around by
 790   // the titlebar--even though it doesn't update the shelf icon positions, we
 791   // still want the visual effect.
 792   std::map<int, aura::Window*> window_ordering;
 793   for (PanelList::const_iterator it = panel_windows_.begin();
 794        it != panel_windows_.end(); ++it) {
 795     gfx::Rect bounds = it->window->bounds();
 796     window_ordering.insert(std::make_pair(horizontal ?
 797                                               bounds.x() + bounds.width() / 2 :
 798                                               bounds.y() + bounds.height() / 2,
 799                                           it->window));
 800   }
 801
 802   aura::Window* previous_panel = NULL;
 803   for (std::map<int, aura::Window*>::const_iterator it =
 804        window_ordering.begin();
 805        it != window_ordering.end() && it->second != active_panel; ++it) {
 806     if (previous_panel)
 807       panel_container_->StackChildAbove(it->second, previous_panel);
 808     previous_panel = it->second;
 809   }
 810
 811   previous_panel = NULL;
 812   for (std::map<int, aura::Window*>::const_reverse_iterator it =
 813        window_ordering.rbegin();
 814        it != window_ordering.rend() && it->second != active_panel; ++it) {
 815     if (previous_panel)
 816       panel_container_->StackChildAbove(it->second, previous_panel);
 817     previous_panel = it->second;
 818   }
 819
 820   panel_container_->StackChildAtTop(active_panel);
 821   if (dragged_panel_ && dragged_panel_->parent() == panel_container_)
 822     panel_container_->StackChildAtTop(dragged_panel_);
 823   last_active_panel_ = active_panel;
 824 }
 825
 826 void PanelLayoutManager::UpdateCallouts() {
 827   ShelfAlignment alignment = shelf_->alignment();
 828   bool horizontal = alignment == SHELF_ALIGNMENT_TOP ||
 829                     alignment == SHELF_ALIGNMENT_BOTTOM;
 830
 831   for (PanelList::iterator iter = panel_windows_.begin();
 832        iter != panel_windows_.end(); ++iter) {
 833     aura::Window* panel = iter->window;
 834     views::Widget* callout_widget = iter->callout_widget;
 835
 836     gfx::Rect current_bounds = panel->GetBoundsInScreen();
 837     gfx::Rect bounds = ScreenUtil::ConvertRectToScreen(
 838         panel->parent(),
 839         panel->GetTargetBounds());
 840     gfx::Rect icon_bounds = shelf_->GetScreenBoundsOfItemIconForWindow(panel);
 841     if (icon_bounds.IsEmpty() || !panel->layer()->GetTargetVisibility() ||
 842         panel == dragged_panel_ || !show_callout_widgets_) {
 843       callout_widget->Hide();
 844       callout_widget->GetNativeWindow()->layer()->SetOpacity(0);
 845       continue;
 846     }
 847
 848     gfx::Rect callout_bounds = callout_widget->GetWindowBoundsInScreen();
 849     gfx::Vector2d slide_vector = bounds.origin() - current_bounds.origin();
 850     int slide_distance = horizontal ? slide_vector.x() : slide_vector.y();
 851     int distance_until_over_panel = 0;
 852     if (horizontal) {
 853       callout_bounds.set_x(
 854           icon_bounds.x() + (icon_bounds.width() - callout_bounds.width()) / 2);
 855       distance_until_over_panel = std::max(
 856           current_bounds.x() - callout_bounds.x(),
 857           callout_bounds.right() - current_bounds.right());
 858     } else {
 859       callout_bounds.set_y(
 860           icon_bounds.y() + (icon_bounds.height() -
 861                              callout_bounds.height()) / 2);
 862       distance_until_over_panel = std::max(
 863           current_bounds.y() - callout_bounds.y(),
 864           callout_bounds.bottom() - current_bounds.bottom());
 865     }
 866     switch (alignment) {
 867       case SHELF_ALIGNMENT_BOTTOM:
 868         callout_bounds.set_y(bounds.bottom());
 869         break;
 870       case SHELF_ALIGNMENT_LEFT:
 871         callout_bounds.set_x(bounds.x() - callout_bounds.width());
 872         break;
 873       case SHELF_ALIGNMENT_RIGHT:
 874         callout_bounds.set_x(bounds.right());
 875         break;
 876       case SHELF_ALIGNMENT_TOP:
 877         callout_bounds.set_y(bounds.y() - callout_bounds.height());
 878         break;
 879     }
 880     callout_bounds = ScreenUtil::ConvertRectFromScreen(
 881         callout_widget->GetNativeWindow()->parent(),
 882         callout_bounds);
 883
 884     SetChildBoundsDirect(callout_widget->GetNativeWindow(), callout_bounds);
 885     panel_container_->StackChildAbove(callout_widget->GetNativeWindow(),
 886                                       panel);
 887
 888     ui::Layer* layer = callout_widget->GetNativeWindow()->layer();
 889     // If the panel is not over the callout position or has just become visible
 890     // then fade in the callout.
 891     if ((distance_until_over_panel > 0 || layer->GetTargetOpacity() < 1)) {
 892       if (distance_until_over_panel > 0 &&
 893           slide_distance >= distance_until_over_panel) {
 894         // If the panel is not yet over the callout, then delay fading in
 895         // the callout until after the panel should be over it.
 896         int delay = kPanelSlideDurationMilliseconds *
 897             distance_until_over_panel / slide_distance;
 898         layer->SetOpacity(0);
 899         layer->GetAnimator()->StopAnimating();
 900         layer->GetAnimator()->SchedulePauseForProperties(
 901             base::TimeDelta::FromMilliseconds(delay),
 902             ui::LayerAnimationElement::OPACITY);
 903       }
 904       ui::ScopedLayerAnimationSettings callout_settings(layer->GetAnimator());
 905       callout_settings.SetPreemptionStrategy(
 906           ui::LayerAnimator::REPLACE_QUEUED_ANIMATIONS);
 907       callout_settings.SetTransitionDuration(
 908           base::TimeDelta::FromMilliseconds(
 909               kCalloutFadeDurationMilliseconds));
 910       layer->SetOpacity(1);
 911     }
 912
 913     // Show after changing the opacity animation. This way we don't have a
 914     // state where the widget is visible but the opacity is 0.
 915     callout_widget->Show();
 916   }
 917 }
 918
 919 ////////////////////////////////////////////////////////////////////////////////
 920 // keyboard::KeyboardControllerObserver implementation:
 921
 922 void PanelLayoutManager::OnKeyboardBoundsChanging(
 923     const gfx::Rect& keyboard_bounds) {
 924   gfx::Rect parent_bounds = panel_container_->bounds();
 925   int available_space = parent_bounds.height() - keyboard_bounds.height();
 926   for (PanelList::iterator iter = panel_windows_.begin();
 927        iter != panel_windows_.end();
 928        ++iter) {
 929     aura::Window* panel = iter->window;
 930     wm::WindowState* panel_state = wm::GetWindowState(panel);
 931     if (keyboard_bounds.height() > 0) {
 932       // Save existing bounds, so that we can restore them when the keyboard
 933       // hides.
 934       panel_state->SaveCurrentBoundsForRestore();
 935
 936       gfx::Rect panel_bounds = ScreenUtil::ConvertRectToScreen(
 937           panel->parent(), panel->GetTargetBounds());
 938       int delta = panel_bounds.height() - available_space;
 939       // Ensure panels are not pushed above the parent boundaries, shrink any
 940       // panels that violate this constraint.
 941       if (delta > 0) {
 942         SetChildBounds(panel,
 943                        gfx::Rect(panel_bounds.x(),
 944                                  panel_bounds.y() + delta,
 945                                  panel_bounds.width(),
 946                                  panel_bounds.height() - delta));
 947       }
 948     } else if (panel_state->HasRestoreBounds()) {
 949       // Keyboard hidden, restore original bounds if they exist.
 950       SetChildBounds(panel, panel_state->GetRestoreBoundsInScreen());
 951     }
 952   }
 953   // This bounds change will have caused a change to the Shelf which does not
 954   // propogate automatically to this class, so manually recalculate bounds.
 955   OnWindowResized();
 956 }
 957
 958 }  // namespace ash