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