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