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