chrome/browser/ui/views/tabs/tab_drag_controller.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 "chrome/browser/ui/views/tabs/tab_drag_controller.h"
   6
   7 #include <math.h>
   8 #include <set>
   9
  10 #include "base/auto_reset.h"
  11 #include "base/callback.h"
  12 #include "base/i18n/rtl.h"
  13 #include "chrome/browser/chrome_notification_types.h"
  14 #include "chrome/browser/profiles/profile.h"
  15 #include "chrome/browser/ui/browser_list.h"
  16 #include "chrome/browser/ui/browser_window.h"
  17 #include "chrome/browser/ui/tabs/tab_strip_model.h"
  18 #include "chrome/browser/ui/tabs/tab_strip_model_delegate.h"
  19 #include "chrome/browser/ui/views/frame/browser_view.h"
  20 #include "chrome/browser/ui/views/tabs/browser_tab_strip_controller.h"
  21 #include "chrome/browser/ui/views/tabs/stacked_tab_strip_layout.h"
  22 #include "chrome/browser/ui/views/tabs/tab.h"
  23 #include "chrome/browser/ui/views/tabs/tab_strip.h"
  24 #include "chrome/browser/ui/views/tabs/window_finder.h"
  25 #include "content/public/browser/notification_details.h"
  26 #include "content/public/browser/notification_service.h"
  27 #include "content/public/browser/notification_source.h"
  28 #include "content/public/browser/notification_types.h"
  29 #include "content/public/browser/user_metrics.h"
  30 #include "content/public/browser/web_contents.h"
  31 #include "extensions/browser/extension_function_dispatcher.h"
  32 #include "ui/events/event_constants.h"
  33 #include "ui/events/gestures/gesture_recognizer.h"
  34 #include "ui/gfx/geometry/point_conversions.h"
  35 #include "ui/gfx/screen.h"
  36 #include "ui/views/event_monitor.h"
  37 #include "ui/views/focus/view_storage.h"
  38 #include "ui/views/widget/root_view.h"
  39 #include "ui/views/widget/widget.h"
  40
  41 #if defined(USE_ASH)
  42 #include "ash/accelerators/accelerator_commands.h"
  43 #include "ash/shell.h"
  44 #include "ash/wm/maximize_mode/maximize_mode_controller.h"
  45 #include "ash/wm/window_state.h"
  46 #include "ui/wm/core/coordinate_conversion.h"
  47 #endif
  48
  49 #if defined(USE_AURA)
  50 #include "ui/aura/env.h"
  51 #include "ui/aura/window.h"
  52 #include "ui/wm/core/window_modality_controller.h"
  53 #endif
  54
  55 using base::UserMetricsAction;
  56 using content::OpenURLParams;
  57 using content::WebContents;
  58
  59 // If non-null there is a drag underway.
  60 static TabDragController* instance_ = NULL;
  61
  62 namespace {
  63
  64 // Delay, in ms, during dragging before we bring a window to front.
  65 const int kBringToFrontDelay = 750;
  66
  67 // Initial delay before moving tabs when the dragged tab is close to the edge of
  68 // the stacked tabs.
  69 const int kMoveAttachedInitialDelay = 600;
  70
  71 // Delay for moving tabs after the initial delay has passed.
  72 const int kMoveAttachedSubsequentDelay = 300;
  73
  74 const int kHorizontalMoveThreshold = 16;  // Pixels.
  75
  76 // Distance from the next/previous stacked before before we consider the tab
  77 // close enough to trigger moving.
  78 const int kStackedDistance = 36;
  79
  80 #if defined(USE_ASH)
  81 void SetWindowPositionManaged(gfx::NativeWindow window, bool value) {
  82   ash::wm::GetWindowState(window)->set_window_position_managed(value);
  83 }
  84
  85 // Returns true if |tab_strip| browser window is docked.
  86 bool IsDockedOrSnapped(const TabStrip* tab_strip) {
  87   DCHECK(tab_strip);
  88   ash::wm::WindowState* window_state =
  89       ash::wm::GetWindowState(tab_strip->GetWidget()->GetNativeWindow());
  90   return window_state->IsDocked() || window_state->IsSnapped();
  91 }
  92 #else
  93 void SetWindowPositionManaged(gfx::NativeWindow window, bool value) {
  94 }
  95
  96 bool IsDockedOrSnapped(const TabStrip* tab_strip) {
  97   return false;
  98 }
  99 #endif
 100
 101 #if defined(USE_AURA)
 102 gfx::NativeWindow GetModalTransient(gfx::NativeWindow window) {
 103   return wm::GetModalTransient(window);
 104 }
 105 #else
 106 gfx::NativeWindow GetModalTransient(gfx::NativeWindow window) {
 107   NOTIMPLEMENTED();
 108   return NULL;
 109 }
 110 #endif
 111
 112 // Returns true if |bounds| contains the y-coordinate |y|. The y-coordinate
 113 // of |bounds| is adjusted by |vertical_adjustment|.
 114 bool DoesRectContainVerticalPointExpanded(
 115     const gfx::Rect& bounds,
 116     int vertical_adjustment,
 117     int y) {
 118   int upper_threshold = bounds.bottom() + vertical_adjustment;
 119   int lower_threshold = bounds.y() - vertical_adjustment;
 120   return y >= lower_threshold && y <= upper_threshold;
 121 }
 122
 123 // Adds |x_offset| to all the rectangles in |rects|.
 124 void OffsetX(int x_offset, std::vector<gfx::Rect>* rects) {
 125   if (x_offset == 0)
 126     return;
 127
 128   for (size_t i = 0; i < rects->size(); ++i)
 129     (*rects)[i].set_x((*rects)[i].x() + x_offset);
 130 }
 131
 132 // WidgetObserver implementation that resets the window position managed
 133 // property on Show.
 134 // We're forced to do this here since BrowserFrameAsh resets the 'window
 135 // position managed' property during a show and we need the property set to
 136 // false before WorkspaceLayoutManager sees the visibility change.
 137 class WindowPositionManagedUpdater : public views::WidgetObserver {
 138  public:
 139   void OnWidgetVisibilityChanged(views::Widget* widget, bool visible) override {
 140     SetWindowPositionManaged(widget->GetNativeWindow(), false);
 141   }
 142 };
 143
 144 // EscapeTracker installs an event monitor and runs a callback when it receives
 145 // the escape key.
 146 class EscapeTracker : public ui::EventHandler {
 147  public:
 148   explicit EscapeTracker(const base::Closure& callback)
 149       : escape_callback_(callback),
 150         event_monitor_(views::EventMonitor::CreateApplicationMonitor(this)) {
 151   }
 152
 153  private:
 154   // ui::EventHandler:
 155   void OnKeyEvent(ui::KeyEvent* key) override {
 156     if (key->type() == ui::ET_KEY_PRESSED &&
 157         key->key_code() == ui::VKEY_ESCAPE) {
 158       escape_callback_.Run();
 159     }
 160   }
 161
 162   base::Closure escape_callback_;
 163   scoped_ptr<views::EventMonitor> event_monitor_;
 164
 165   DISALLOW_COPY_AND_ASSIGN(EscapeTracker);
 166 };
 167
 168 }  // namespace
 169
 170 TabDragController::TabDragData::TabDragData()
 171     : contents(NULL),
 172       source_model_index(-1),
 173       attached_tab(NULL),
 174       pinned(false) {
 175 }
 176
 177 TabDragController::TabDragData::~TabDragData() {
 178 }
 179
 180 ///////////////////////////////////////////////////////////////////////////////
 181 // TabDragController, public:
 182
 183 // static
 184 const int TabDragController::kTouchVerticalDetachMagnetism = 50;
 185
 186 // static
 187 const int TabDragController::kVerticalDetachMagnetism = 15;
 188
 189 TabDragController::TabDragController()
 190     : event_source_(EVENT_SOURCE_MOUSE),
 191       source_tabstrip_(NULL),
 192       attached_tabstrip_(NULL),
 193       screen_(NULL),
 194       host_desktop_type_(chrome::HOST_DESKTOP_TYPE_NATIVE),
 195       can_release_capture_(true),
 196       offset_to_width_ratio_(0),
 197       old_focused_view_id_(
 198           views::ViewStorage::GetInstance()->CreateStorageID()),
 199       last_move_screen_loc_(0),
 200       started_drag_(false),
 201       active_(true),
 202       source_tab_index_(std::numeric_limits<size_t>::max()),
 203       initial_move_(true),
 204       detach_behavior_(DETACHABLE),
 205       move_behavior_(REORDER),
 206       mouse_move_direction_(0),
 207       is_dragging_window_(false),
 208       is_dragging_new_browser_(false),
 209       was_source_maximized_(false),
 210       was_source_fullscreen_(false),
 211       did_restore_window_(false),
 212       end_run_loop_behavior_(END_RUN_LOOP_STOP_DRAGGING),
 213       waiting_for_run_loop_to_exit_(false),
 214       tab_strip_to_attach_to_after_exit_(NULL),
 215       move_loop_widget_(NULL),
 216       is_mutating_(false),
 217       attach_x_(-1),
 218       attach_index_(-1),
 219       weak_factory_(this) {
 220   instance_ = this;
 221 }
 222
 223 TabDragController::~TabDragController() {
 224   views::ViewStorage::GetInstance()->RemoveView(old_focused_view_id_);
 225
 226   if (instance_ == this)
 227     instance_ = NULL;
 228
 229   if (move_loop_widget_) {
 230     move_loop_widget_->RemoveObserver(this);
 231     SetWindowPositionManaged(move_loop_widget_->GetNativeWindow(), true);
 232   }
 233
 234   if (source_tabstrip_)
 235     GetModel(source_tabstrip_)->RemoveObserver(this);
 236
 237   if (event_source_ == EVENT_SOURCE_TOUCH) {
 238     TabStrip* capture_tabstrip = attached_tabstrip_ ?
 239         attached_tabstrip_ : source_tabstrip_;
 240     capture_tabstrip->GetWidget()->ReleaseCapture();
 241   }
 242 }
 243
 244 void TabDragController::Init(
 245     TabStrip* source_tabstrip,
 246     Tab* source_tab,
 247     const std::vector<Tab*>& tabs,
 248     const gfx::Point& mouse_offset,
 249     int source_tab_offset,
 250     const ui::ListSelectionModel& initial_selection_model,
 251     MoveBehavior move_behavior,
 252     EventSource event_source) {
 253   DCHECK(!tabs.empty());
 254   DCHECK(std::find(tabs.begin(), tabs.end(), source_tab) != tabs.end());
 255   source_tabstrip_ = source_tabstrip;
 256   was_source_maximized_ = source_tabstrip->GetWidget()->IsMaximized();
 257   was_source_fullscreen_ = source_tabstrip->GetWidget()->IsFullscreen();
 258   screen_ = gfx::Screen::GetScreenFor(
 259       source_tabstrip->GetWidget()->GetNativeView());
 260   host_desktop_type_ = chrome::GetHostDesktopTypeForNativeView(
 261       source_tabstrip->GetWidget()->GetNativeView());
 262   // Do not release capture when transferring capture between widgets on:
 263   // - Desktop Linux
 264   //     Mouse capture is not synchronous on desktop Linux. Chrome makes
 265   //     transferring capture between widgets without releasing capture appear
 266   //     synchronous on desktop Linux, so use that.
 267   // - Ash
 268   //     Releasing capture on Ash cancels gestures so avoid it.
 269 #if defined(OS_LINUX)
 270   can_release_capture_ = false;
 271 #else
 272   can_release_capture_ =
 273       (host_desktop_type_ != chrome::HOST_DESKTOP_TYPE_ASH);
 274 #endif
 275   start_point_in_screen_ = gfx::Point(source_tab_offset, mouse_offset.y());
 276   views::View::ConvertPointToScreen(source_tab, &start_point_in_screen_);
 277   event_source_ = event_source;
 278   mouse_offset_ = mouse_offset;
 279   move_behavior_ = move_behavior;
 280   last_point_in_screen_ = start_point_in_screen_;
 281   last_move_screen_loc_ = start_point_in_screen_.x();
 282   initial_tab_positions_ = source_tabstrip->GetTabXCoordinates();
 283
 284   GetModel(source_tabstrip_)->AddObserver(this);
 285
 286   drag_data_.resize(tabs.size());
 287   for (size_t i = 0; i < tabs.size(); ++i)
 288     InitTabDragData(tabs[i], &(drag_data_[i]));
 289   source_tab_index_ =
 290       std::find(tabs.begin(), tabs.end(), source_tab) - tabs.begin();
 291
 292   // Listen for Esc key presses.
 293   escape_tracker_.reset(
 294       new EscapeTracker(base::Bind(&TabDragController::EndDrag,
 295                                    weak_factory_.GetWeakPtr(),
 296                                    END_DRAG_CANCEL)));
 297
 298   if (source_tab->width() > 0) {
 299     offset_to_width_ratio_ = static_cast<float>(
 300         source_tab->GetMirroredXInView(source_tab_offset)) /
 301         static_cast<float>(source_tab->width());
 302   }
 303   InitWindowCreatePoint();
 304   initial_selection_model_.Copy(initial_selection_model);
 305
 306   // Gestures don't automatically do a capture. We don't allow multiple drags at
 307   // the same time, so we explicitly capture.
 308   if (event_source == EVENT_SOURCE_TOUCH)
 309     source_tabstrip_->GetWidget()->SetCapture(source_tabstrip_);
 310
 311 #if defined(USE_ASH)
 312   if (ash::Shell::HasInstance() &&
 313       ash::Shell::GetInstance()->maximize_mode_controller()->
 314           IsMaximizeModeWindowManagerEnabled()) {
 315     detach_behavior_ = NOT_DETACHABLE;
 316   }
 317 #endif
 318 }
 319
 320 // static
 321 bool TabDragController::IsAttachedTo(const TabStrip* tab_strip) {
 322   return (instance_ && instance_->active() &&
 323           instance_->attached_tabstrip() == tab_strip);
 324 }
 325
 326 // static
 327 bool TabDragController::IsActive() {
 328   return instance_ && instance_->active();
 329 }
 330
 331 void TabDragController::SetMoveBehavior(MoveBehavior behavior) {
 332   if (started_drag())
 333     return;
 334
 335   move_behavior_ = behavior;
 336 }
 337
 338 void TabDragController::Drag(const gfx::Point& point_in_screen) {
 339   TRACE_EVENT1("views", "TabDragController::Drag",
 340                "point_in_screen", point_in_screen.ToString());
 341
 342   bring_to_front_timer_.Stop();
 343   move_stacked_timer_.Stop();
 344
 345   if (waiting_for_run_loop_to_exit_)
 346     return;
 347
 348   if (!started_drag_) {
 349     if (!CanStartDrag(point_in_screen))
 350       return;  // User hasn't dragged far enough yet.
 351
 352     // On windows SaveFocus() may trigger a capture lost, which destroys us.
 353     {
 354       base::WeakPtr<TabDragController> ref(weak_factory_.GetWeakPtr());
 355       SaveFocus();
 356       if (!ref)
 357         return;
 358     }
 359     started_drag_ = true;
 360     Attach(source_tabstrip_, gfx::Point());
 361     if (static_cast<int>(drag_data_.size()) ==
 362         GetModel(source_tabstrip_)->count()) {
 363       if (was_source_maximized_ || was_source_fullscreen_) {
 364         did_restore_window_ = true;
 365         // When all tabs in a maximized browser are dragged the browser gets
 366         // restored during the drag and maximized back when the drag ends.
 367         views::Widget* widget = GetAttachedBrowserWidget();
 368         const int last_tabstrip_width = attached_tabstrip_->tab_area_width();
 369         std::vector<gfx::Rect> drag_bounds = CalculateBoundsForDraggedTabs();
 370         OffsetX(GetAttachedDragPoint(point_in_screen).x(), &drag_bounds);
 371         gfx::Rect new_bounds(CalculateDraggedBrowserBounds(source_tabstrip_,
 372                                                            point_in_screen,
 373                                                            &drag_bounds));
 374         new_bounds.Offset(-widget->GetRestoredBounds().x() +
 375                           point_in_screen.x() -
 376                           mouse_offset_.x(), 0);
 377         widget->SetVisibilityChangedAnimationsEnabled(false);
 378         widget->Restore();
 379         widget->SetBounds(new_bounds);
 380         AdjustBrowserAndTabBoundsForDrag(last_tabstrip_width,
 381                                          point_in_screen,
 382                                          &drag_bounds);
 383         widget->SetVisibilityChangedAnimationsEnabled(true);
 384       }
 385       RunMoveLoop(GetWindowOffset(point_in_screen));
 386       return;
 387     }
 388   }
 389
 390   ContinueDragging(point_in_screen);
 391 }
 392
 393 void TabDragController::EndDrag(EndDragReason reason) {
 394   TRACE_EVENT0("views", "TabDragController::EndDrag");
 395
 396   // If we're dragging a window ignore capture lost since it'll ultimately
 397   // trigger the move loop to end and we'll revert the drag when RunMoveLoop()
 398   // finishes.
 399   if (reason == END_DRAG_CAPTURE_LOST && is_dragging_window_)
 400     return;
 401   EndDragImpl(reason != END_DRAG_COMPLETE && source_tabstrip_ ?
 402               CANCELED : NORMAL);
 403 }
 404
 405 void TabDragController::InitTabDragData(Tab* tab,
 406                                         TabDragData* drag_data) {
 407   TRACE_EVENT0("views", "TabDragController::InitTabDragData");
 408   drag_data->source_model_index =
 409       source_tabstrip_->GetModelIndexOfTab(tab);
 410   drag_data->contents = GetModel(source_tabstrip_)->GetWebContentsAt(
 411       drag_data->source_model_index);
 412   drag_data->pinned = source_tabstrip_->IsTabPinned(tab);
 413   registrar_.Add(
 414       this,
 415       content::NOTIFICATION_WEB_CONTENTS_DESTROYED,
 416       content::Source<WebContents>(drag_data->contents));
 417 }
 418
 419 ///////////////////////////////////////////////////////////////////////////////
 420 // TabDragController, content::NotificationObserver implementation:
 421
 422 void TabDragController::Observe(
 423     int type,
 424     const content::NotificationSource& source,
 425     const content::NotificationDetails& details) {
 426   DCHECK_EQ(content::NOTIFICATION_WEB_CONTENTS_DESTROYED, type);
 427   WebContents* destroyed_web_contents =
 428       content::Source<WebContents>(source).ptr();
 429   for (size_t i = 0; i < drag_data_.size(); ++i) {
 430     if (drag_data_[i].contents == destroyed_web_contents) {
 431       // One of the tabs we're dragging has been destroyed. Cancel the drag.
 432       drag_data_[i].contents = NULL;
 433       EndDragImpl(TAB_DESTROYED);
 434       return;
 435     }
 436   }
 437   // If we get here it means we got notification for a tab we don't know about.
 438   NOTREACHED();
 439 }
 440
 441 void TabDragController::OnWidgetBoundsChanged(views::Widget* widget,
 442                                               const gfx::Rect& new_bounds) {
 443   TRACE_EVENT1("views", "TabDragController::OnWidgetBoundsChanged",
 444                "new_bounds", new_bounds.ToString());
 445
 446   Drag(GetCursorScreenPoint());
 447 }
 448
 449 void TabDragController::TabStripEmpty() {
 450   GetModel(source_tabstrip_)->RemoveObserver(this);
 451   // NULL out source_tabstrip_ so that we don't attempt to add back to it (in
 452   // the case of a revert).
 453   source_tabstrip_ = NULL;
 454 }
 455
 456 ///////////////////////////////////////////////////////////////////////////////
 457 // TabDragController, private:
 458
 459 void TabDragController::InitWindowCreatePoint() {
 460   // window_create_point_ is only used in CompleteDrag() (through
 461   // GetWindowCreatePoint() to get the start point of the docked window) when
 462   // the attached_tabstrip_ is NULL and all the window's related bound
 463   // information are obtained from source_tabstrip_. So, we need to get the
 464   // first_tab based on source_tabstrip_, not attached_tabstrip_. Otherwise,
 465   // the window_create_point_ is not in the correct coordinate system. Please
 466   // refer to http://crbug.com/6223 comment #15 for detailed information.
 467   views::View* first_tab = source_tabstrip_->tab_at(0);
 468   views::View::ConvertPointToWidget(first_tab, &first_source_tab_point_);
 469   window_create_point_ = first_source_tab_point_;
 470   window_create_point_.Offset(mouse_offset_.x(), mouse_offset_.y());
 471 }
 472
 473 gfx::Point TabDragController::GetWindowCreatePoint(
 474     const gfx::Point& origin) const {
 475   // If the cursor is outside the monitor area, move it inside. For example,
 476   // dropping a tab onto the task bar on Windows produces this situation.
 477   gfx::Rect work_area = screen_->GetDisplayNearestPoint(origin).work_area();
 478   gfx::Point create_point(origin);
 479   if (!work_area.IsEmpty()) {
 480     if (create_point.x() < work_area.x())
 481       create_point.set_x(work_area.x());
 482     else if (create_point.x() > work_area.right())
 483       create_point.set_x(work_area.right());
 484     if (create_point.y() < work_area.y())
 485       create_point.set_y(work_area.y());
 486     else if (create_point.y() > work_area.bottom())
 487       create_point.set_y(work_area.bottom());
 488   }
 489   return gfx::Point(create_point.x() - window_create_point_.x(),
 490                     create_point.y() - window_create_point_.y());
 491 }
 492
 493 void TabDragController::SaveFocus() {
 494   DCHECK(source_tabstrip_);
 495   views::View* focused_view =
 496       source_tabstrip_->GetFocusManager()->GetFocusedView();
 497   if (focused_view)
 498     views::ViewStorage::GetInstance()->StoreView(old_focused_view_id_,
 499                                                  focused_view);
 500   source_tabstrip_->GetFocusManager()->SetFocusedView(source_tabstrip_);
 501   // WARNING: we may have been deleted.
 502 }
 503
 504 void TabDragController::RestoreFocus() {
 505   if (attached_tabstrip_ != source_tabstrip_) {
 506     if (is_dragging_new_browser_) {
 507       content::WebContents* active_contents = source_dragged_contents();
 508       if (active_contents && !active_contents->FocusLocationBarByDefault())
 509         active_contents->Focus();
 510     }
 511     return;
 512   }
 513   views::View* old_focused_view =
 514       views::ViewStorage::GetInstance()->RetrieveView(old_focused_view_id_);
 515   if (!old_focused_view)
 516     return;
 517   old_focused_view->GetFocusManager()->SetFocusedView(old_focused_view);
 518 }
 519
 520 bool TabDragController::CanStartDrag(const gfx::Point& point_in_screen) const {
 521   // Determine if the mouse has moved beyond a minimum elasticity distance in
 522   // any direction from the starting point.
 523   static const int kMinimumDragDistance = 10;
 524   int x_offset = abs(point_in_screen.x() - start_point_in_screen_.x());
 525   int y_offset = abs(point_in_screen.y() - start_point_in_screen_.y());
 526   return sqrt(pow(static_cast<float>(x_offset), 2) +
 527               pow(static_cast<float>(y_offset), 2)) > kMinimumDragDistance;
 528 }
 529
 530 void TabDragController::ContinueDragging(const gfx::Point& point_in_screen) {
 531   TRACE_EVENT1("views", "TabDragController::ContinueDragging",
 532                "point_in_screen", point_in_screen.ToString());
 533
 534   DCHECK(attached_tabstrip_);
 535
 536   TabStrip* target_tabstrip = detach_behavior_ == DETACHABLE ?
 537       GetTargetTabStripForPoint(point_in_screen) : source_tabstrip_;
 538   bool tab_strip_changed = (target_tabstrip != attached_tabstrip_);
 539
 540   if (attached_tabstrip_) {
 541     int move_delta = point_in_screen.x() - last_point_in_screen_.x();
 542     if (move_delta > 0)
 543       mouse_move_direction_ |= kMovedMouseRight;
 544     else if (move_delta < 0)
 545       mouse_move_direction_ |= kMovedMouseLeft;
 546   }
 547   last_point_in_screen_ = point_in_screen;
 548
 549   if (tab_strip_changed) {
 550     is_dragging_new_browser_ = false;
 551     did_restore_window_ = false;
 552     if (DragBrowserToNewTabStrip(target_tabstrip, point_in_screen) ==
 553         DRAG_BROWSER_RESULT_STOP) {
 554       return;
 555     }
 556   }
 557   if (is_dragging_window_) {
 558     static_cast<base::Timer*>(&bring_to_front_timer_)->Start(FROM_HERE,
 559         base::TimeDelta::FromMilliseconds(kBringToFrontDelay),
 560         base::Bind(&TabDragController::BringWindowUnderPointToFront,
 561                    base::Unretained(this), point_in_screen));
 562   }
 563
 564   if (!is_dragging_window_ && attached_tabstrip_) {
 565     if (move_only()) {
 566       DragActiveTabStacked(point_in_screen);
 567     } else {
 568       MoveAttached(point_in_screen);
 569       if (tab_strip_changed) {
 570         // Move the corresponding window to the front. We do this after the
 571         // move as on windows activate triggers a synchronous paint.
 572         attached_tabstrip_->GetWidget()->Activate();
 573       }
 574     }
 575   }
 576 }
 577
 578 TabDragController::DragBrowserResultType
 579 TabDragController::DragBrowserToNewTabStrip(
 580     TabStrip* target_tabstrip,
 581     const gfx::Point& point_in_screen) {
 582   TRACE_EVENT1("views", "TabDragController::DragBrowserToNewTabStrip",
 583                "point_in_screen", point_in_screen.ToString());
 584
 585   if (!target_tabstrip) {
 586     DetachIntoNewBrowserAndRunMoveLoop(point_in_screen);
 587     return DRAG_BROWSER_RESULT_STOP;
 588   }
 589
 590 #if defined(USE_AURA)
 591   // Only Aura windows are gesture consumers.
 592   ui::GestureRecognizer::Get()->TransferEventsTo(
 593       GetAttachedBrowserWidget()->GetNativeView(),
 594       target_tabstrip->GetWidget()->GetNativeView());
 595 #endif
 596
 597   if (is_dragging_window_) {
 598     // ReleaseCapture() is going to result in calling back to us (because it
 599     // results in a move). That'll cause all sorts of problems.  Reset the
 600     // observer so we don't get notified and process the event.
 601     if (host_desktop_type_ == chrome::HOST_DESKTOP_TYPE_ASH) {
 602       move_loop_widget_->RemoveObserver(this);
 603       move_loop_widget_ = NULL;
 604     }
 605     views::Widget* browser_widget = GetAttachedBrowserWidget();
 606     // Need to release the drag controller before starting the move loop as it's
 607     // going to trigger capture lost, which cancels drag.
 608     attached_tabstrip_->ReleaseDragController();
 609     target_tabstrip->OwnDragController(this);
 610     // Disable animations so that we don't see a close animation on aero.
 611     browser_widget->SetVisibilityChangedAnimationsEnabled(false);
 612     if (can_release_capture_)
 613       browser_widget->ReleaseCapture();
 614     else
 615       target_tabstrip->GetWidget()->SetCapture(attached_tabstrip_);
 616
 617     // The window is going away. Since the drag is still on going we don't want
 618     // that to effect the position of any windows.
 619     SetWindowPositionManaged(browser_widget->GetNativeWindow(), false);
 620
 621 #if !defined(OS_LINUX) || defined(OS_CHROMEOS)
 622     // EndMoveLoop is going to snap the window back to its original location.
 623     // Hide it so users don't see this. Hiding a window in Linux aura causes
 624     // it to lose capture so skip it.
 625     browser_widget->Hide();
 626 #endif
 627     browser_widget->EndMoveLoop();
 628
 629     // Ideally we would always swap the tabs now, but on non-ash Windows, it
 630     // seems that running the move loop implicitly activates the window when
 631     // done, leading to all sorts of flicker. So, on non-ash Windows, instead
 632     // we process the move after the loop completes. But on chromeos, we can
 633     // do tab swapping now to avoid the tab flashing issue
 634     // (crbug.com/116329).
 635     if (can_release_capture_) {
 636       tab_strip_to_attach_to_after_exit_ = target_tabstrip;
 637     } else {
 638       is_dragging_window_ = false;
 639       Detach(DONT_RELEASE_CAPTURE);
 640       Attach(target_tabstrip, point_in_screen);
 641       // Move the tabs into position.
 642       MoveAttached(point_in_screen);
 643       attached_tabstrip_->GetWidget()->Activate();
 644     }
 645
 646     waiting_for_run_loop_to_exit_ = true;
 647     end_run_loop_behavior_ = END_RUN_LOOP_CONTINUE_DRAGGING;
 648     return DRAG_BROWSER_RESULT_STOP;
 649   }
 650   Detach(DONT_RELEASE_CAPTURE);
 651   Attach(target_tabstrip, point_in_screen);
 652   return DRAG_BROWSER_RESULT_CONTINUE;
 653 }
 654
 655 void TabDragController::DragActiveTabStacked(
 656     const gfx::Point& point_in_screen) {
 657   if (attached_tabstrip_->tab_count() !=
 658       static_cast<int>(initial_tab_positions_.size()))
 659     return;  // TODO: should cancel drag if this happens.
 660
 661   int delta = point_in_screen.x() - start_point_in_screen_.x();
 662   attached_tabstrip_->DragActiveTab(initial_tab_positions_, delta);
 663 }
 664
 665 void TabDragController::MoveAttachedToNextStackedIndex(
 666     const gfx::Point& point_in_screen) {
 667   int index = attached_tabstrip_->touch_layout_->active_index();
 668   if (index + 1 >= attached_tabstrip_->tab_count())
 669     return;
 670
 671   GetModel(attached_tabstrip_)->MoveSelectedTabsTo(index + 1);
 672   StartMoveStackedTimerIfNecessary(point_in_screen,
 673                                    kMoveAttachedSubsequentDelay);
 674 }
 675
 676 void TabDragController::MoveAttachedToPreviousStackedIndex(
 677     const gfx::Point& point_in_screen) {
 678   int index = attached_tabstrip_->touch_layout_->active_index();
 679   if (index <= attached_tabstrip_->GetMiniTabCount())
 680     return;
 681
 682   GetModel(attached_tabstrip_)->MoveSelectedTabsTo(index - 1);
 683   StartMoveStackedTimerIfNecessary(point_in_screen,
 684                                    kMoveAttachedSubsequentDelay);
 685 }
 686
 687 void TabDragController::MoveAttached(const gfx::Point& point_in_screen) {
 688   DCHECK(attached_tabstrip_);
 689   DCHECK(!is_dragging_window_);
 690
 691   gfx::Point dragged_view_point = GetAttachedDragPoint(point_in_screen);
 692
 693   // Determine the horizontal move threshold. This is dependent on the width
 694   // of tabs. The smaller the tabs compared to the standard size, the smaller
 695   // the threshold.
 696   int threshold = kHorizontalMoveThreshold;
 697   if (!attached_tabstrip_->touch_layout_.get()) {
 698     double unselected, selected;
 699     attached_tabstrip_->GetCurrentTabWidths(&unselected, &selected);
 700     double ratio = unselected / Tab::GetStandardSize().width();
 701     threshold = static_cast<int>(ratio * kHorizontalMoveThreshold);
 702   }
 703   // else case: touch tabs never shrink.
 704
 705   std::vector<Tab*> tabs(drag_data_.size());
 706   for (size_t i = 0; i < drag_data_.size(); ++i)
 707     tabs[i] = drag_data_[i].attached_tab;
 708
 709   bool did_layout = false;
 710   // Update the model, moving the WebContents from one index to another. Do this
 711   // only if we have moved a minimum distance since the last reorder (to prevent
 712   // jitter) or if this the first move and the tabs are not consecutive.
 713   if ((abs(point_in_screen.x() - last_move_screen_loc_) > threshold ||
 714         (initial_move_ && !AreTabsConsecutive()))) {
 715     TabStripModel* attached_model = GetModel(attached_tabstrip_);
 716     int to_index = GetInsertionIndexForDraggedBounds(
 717         GetDraggedViewTabStripBounds(dragged_view_point));
 718     bool do_move = true;
 719     // While dragging within a tabstrip the expectation is the insertion index
 720     // is based on the left edge of the tabs being dragged. OTOH when dragging
 721     // into a new tabstrip (attaching) the expectation is the insertion index is
 722     // based on the cursor. This proves problematic as insertion may change the
 723     // size of the tabs, resulting in the index calculated before the insert
 724     // differing from the index calculated after the insert. To alleviate this
 725     // the index is chosen before insertion, and subsequently a new index is
 726     // only used once the mouse moves enough such that the index changes based
 727     // on the direction the mouse moved relative to |attach_x_| (smaller
 728     // x-coordinate should yield a smaller index or larger x-coordinate yields a
 729     // larger index).
 730     if (attach_index_ != -1) {
 731       gfx::Point tab_strip_point(point_in_screen);
 732       views::View::ConvertPointFromScreen(attached_tabstrip_, &tab_strip_point);
 733       const int new_x =
 734           attached_tabstrip_->GetMirroredXInView(tab_strip_point.x());
 735       if (new_x < attach_x_)
 736         to_index = std::min(to_index, attach_index_);
 737       else
 738         to_index = std::max(to_index, attach_index_);
 739       if (to_index != attach_index_)
 740         attach_index_ = -1;  // Once a valid move is detected, don't constrain.
 741       else
 742         do_move = false;
 743     }
 744     if (do_move) {
 745       WebContents* last_contents = drag_data_[drag_data_.size() - 1].contents;
 746       int index_of_last_item =
 747           attached_model->GetIndexOfWebContents(last_contents);
 748       if (initial_move_) {
 749         // TabStrip determines if the tabs needs to be animated based on model
 750         // position. This means we need to invoke LayoutDraggedTabsAt before
 751         // changing the model.
 752         attached_tabstrip_->LayoutDraggedTabsAt(
 753             tabs, source_tab_drag_data()->attached_tab, dragged_view_point,
 754             initial_move_);
 755         did_layout = true;
 756       }
 757       attached_model->MoveSelectedTabsTo(to_index);
 758
 759       // Move may do nothing in certain situations (such as when dragging pinned
 760       // tabs). Make sure the tabstrip actually changed before updating
 761       // last_move_screen_loc_.
 762       if (index_of_last_item !=
 763           attached_model->GetIndexOfWebContents(last_contents)) {
 764         last_move_screen_loc_ = point_in_screen.x();
 765       }
 766     }
 767   }
 768
 769   if (!did_layout) {
 770     attached_tabstrip_->LayoutDraggedTabsAt(
 771         tabs, source_tab_drag_data()->attached_tab, dragged_view_point,
 772         initial_move_);
 773   }
 774
 775   StartMoveStackedTimerIfNecessary(point_in_screen, kMoveAttachedInitialDelay);
 776
 777   initial_move_ = false;
 778 }
 779
 780 void TabDragController::StartMoveStackedTimerIfNecessary(
 781     const gfx::Point& point_in_screen,
 782     int delay_ms) {
 783   DCHECK(attached_tabstrip_);
 784
 785   StackedTabStripLayout* touch_layout = attached_tabstrip_->touch_layout_.get();
 786   if (!touch_layout)
 787     return;
 788
 789   gfx::Point dragged_view_point = GetAttachedDragPoint(point_in_screen);
 790   gfx::Rect bounds = GetDraggedViewTabStripBounds(dragged_view_point);
 791   int index = touch_layout->active_index();
 792   if (ShouldDragToNextStackedTab(bounds, index)) {
 793     static_cast<base::Timer*>(&move_stacked_timer_)->Start(
 794         FROM_HERE,
 795         base::TimeDelta::FromMilliseconds(delay_ms),
 796         base::Bind(&TabDragController::MoveAttachedToNextStackedIndex,
 797                    base::Unretained(this), point_in_screen));
 798   } else if (ShouldDragToPreviousStackedTab(bounds, index)) {
 799     static_cast<base::Timer*>(&move_stacked_timer_)->Start(
 800         FROM_HERE,
 801         base::TimeDelta::FromMilliseconds(delay_ms),
 802         base::Bind(&TabDragController::MoveAttachedToPreviousStackedIndex,
 803                    base::Unretained(this), point_in_screen));
 804   }
 805 }
 806
 807 TabDragController::DetachPosition TabDragController::GetDetachPosition(
 808     const gfx::Point& point_in_screen) {
 809   DCHECK(attached_tabstrip_);
 810   gfx::Point attached_point(point_in_screen);
 811   views::View::ConvertPointFromScreen(attached_tabstrip_, &attached_point);
 812   if (attached_point.x() < 0)
 813     return DETACH_BEFORE;
 814   if (attached_point.x() >= attached_tabstrip_->width())
 815     return DETACH_AFTER;
 816   return DETACH_ABOVE_OR_BELOW;
 817 }
 818
 819 TabStrip* TabDragController::GetTargetTabStripForPoint(
 820     const gfx::Point& point_in_screen) {
 821   TRACE_EVENT1("views", "TabDragController::GetTargetTabStripForPoint",
 822                "point_in_screen", point_in_screen.ToString());
 823
 824   if (move_only() && attached_tabstrip_) {
 825     // move_only() is intended for touch, in which case we only want to detach
 826     // if the touch point moves significantly in the vertical distance.
 827     gfx::Rect tabstrip_bounds = GetViewScreenBounds(attached_tabstrip_);
 828     if (DoesRectContainVerticalPointExpanded(tabstrip_bounds,
 829                                              kTouchVerticalDetachMagnetism,
 830                                              point_in_screen.y()))
 831       return attached_tabstrip_;
 832   }
 833   gfx::NativeWindow local_window =
 834       GetLocalProcessWindow(point_in_screen, is_dragging_window_);
 835   // Do not allow dragging into a window with a modal dialog, it causes a weird
 836   // behavior.  See crbug.com/336691
 837   if (!GetModalTransient(local_window)) {
 838     TabStrip* tab_strip = GetTabStripForWindow(local_window);
 839     if (tab_strip && DoesTabStripContain(tab_strip, point_in_screen))
 840       return tab_strip;
 841   }
 842
 843   return is_dragging_window_ ? attached_tabstrip_ : NULL;
 844 }
 845
 846 TabStrip* TabDragController::GetTabStripForWindow(gfx::NativeWindow window) {
 847   if (!window)
 848     return NULL;
 849   BrowserView* browser_view =
 850       BrowserView::GetBrowserViewForNativeWindow(window);
 851   // We don't allow drops on windows that don't have tabstrips.
 852   if (!browser_view ||
 853       !browser_view->browser()->SupportsWindowFeature(
 854           Browser::FEATURE_TABSTRIP))
 855     return NULL;
 856
 857   TabStrip* other_tabstrip = browser_view->tabstrip();
 858   TabStrip* tab_strip =
 859       attached_tabstrip_ ? attached_tabstrip_ : source_tabstrip_;
 860   DCHECK(tab_strip);
 861
 862   return other_tabstrip->controller()->IsCompatibleWith(tab_strip) ?
 863       other_tabstrip : NULL;
 864 }
 865
 866 bool TabDragController::DoesTabStripContain(
 867     TabStrip* tabstrip,
 868     const gfx::Point& point_in_screen) const {
 869   // Make sure the specified screen point is actually within the bounds of the
 870   // specified tabstrip...
 871   gfx::Rect tabstrip_bounds = GetViewScreenBounds(tabstrip);
 872   return point_in_screen.x() < tabstrip_bounds.right() &&
 873       point_in_screen.x() >= tabstrip_bounds.x() &&
 874       DoesRectContainVerticalPointExpanded(tabstrip_bounds,
 875                                            kVerticalDetachMagnetism,
 876                                            point_in_screen.y());
 877 }
 878
 879 void TabDragController::Attach(TabStrip* attached_tabstrip,
 880                                const gfx::Point& point_in_screen) {
 881   TRACE_EVENT1("views", "TabDragController::Attach",
 882                "point_in_screen", point_in_screen.ToString());
 883
 884   DCHECK(!attached_tabstrip_);  // We should already have detached by the time
 885                                 // we get here.
 886
 887   attached_tabstrip_ = attached_tabstrip;
 888
 889   std::vector<Tab*> tabs =
 890       GetTabsMatchingDraggedContents(attached_tabstrip_);
 891
 892   if (tabs.empty()) {
 893     // Transitioning from detached to attached to a new tabstrip. Add tabs to
 894     // the new model.
 895
 896     selection_model_before_attach_.Copy(attached_tabstrip->GetSelectionModel());
 897
 898     // Inserting counts as a move. We don't want the tabs to jitter when the
 899     // user moves the tab immediately after attaching it.
 900     last_move_screen_loc_ = point_in_screen.x();
 901
 902     // Figure out where to insert the tab based on the bounds of the dragged
 903     // representation and the ideal bounds of the other Tabs already in the
 904     // strip. ("ideal bounds" are stable even if the Tabs' actual bounds are
 905     // changing due to animation).
 906     gfx::Point tab_strip_point(point_in_screen);
 907     views::View::ConvertPointFromScreen(attached_tabstrip_, &tab_strip_point);
 908     tab_strip_point.set_x(
 909         attached_tabstrip_->GetMirroredXInView(tab_strip_point.x()));
 910     tab_strip_point.Offset(0, -mouse_offset_.y());
 911     int index = GetInsertionIndexForDraggedBounds(
 912         GetDraggedViewTabStripBounds(tab_strip_point));
 913     attach_index_ = index;
 914     attach_x_ = tab_strip_point.x();
 915     base::AutoReset<bool> setter(&is_mutating_, true);
 916     for (size_t i = 0; i < drag_data_.size(); ++i) {
 917       int add_types = TabStripModel::ADD_NONE;
 918       if (attached_tabstrip_->touch_layout_.get()) {
 919         // StackedTabStripLayout positions relative to the active tab, if we
 920         // don't add the tab as active things bounce around.
 921         DCHECK_EQ(1u, drag_data_.size());
 922         add_types |= TabStripModel::ADD_ACTIVE;
 923       }
 924       if (drag_data_[i].pinned)
 925         add_types |= TabStripModel::ADD_PINNED;
 926       GetModel(attached_tabstrip_)->InsertWebContentsAt(
 927           index + i, drag_data_[i].contents, add_types);
 928     }
 929
 930     tabs = GetTabsMatchingDraggedContents(attached_tabstrip_);
 931   }
 932   DCHECK_EQ(tabs.size(), drag_data_.size());
 933   for (size_t i = 0; i < drag_data_.size(); ++i)
 934     drag_data_[i].attached_tab = tabs[i];
 935
 936   attached_tabstrip_->StartedDraggingTabs(tabs);
 937
 938   ResetSelection(GetModel(attached_tabstrip_));
 939
 940   // The size of the dragged tab may have changed. Adjust the x offset so that
 941   // ratio of mouse_offset_ to original width is maintained.
 942   std::vector<Tab*> tabs_to_source(tabs);
 943   tabs_to_source.erase(tabs_to_source.begin() + source_tab_index_ + 1,
 944                        tabs_to_source.end());
 945   int new_x = attached_tabstrip_->GetSizeNeededForTabs(tabs_to_source) -
 946       tabs[source_tab_index_]->width() +
 947       static_cast<int>(offset_to_width_ratio_ *
 948                        tabs[source_tab_index_]->width());
 949   mouse_offset_.set_x(new_x);
 950
 951   // Transfer ownership of us to the new tabstrip as well as making sure the
 952   // window has capture. This is important so that if activation changes the
 953   // drag isn't prematurely canceled.
 954   attached_tabstrip_->GetWidget()->SetCapture(attached_tabstrip_);
 955   attached_tabstrip_->OwnDragController(this);
 956 }
 957
 958 void TabDragController::Detach(ReleaseCapture release_capture) {
 959   TRACE_EVENT1("views", "TabDragController::Detach",
 960                "release_capture", release_capture);
 961
 962   attach_index_ = -1;
 963
 964   // When the user detaches we assume they want to reorder.
 965   move_behavior_ = REORDER;
 966
 967   // Release ownership of the drag controller and mouse capture. When we
 968   // reattach ownership is transfered.
 969   attached_tabstrip_->ReleaseDragController();
 970   if (release_capture == RELEASE_CAPTURE)
 971     attached_tabstrip_->GetWidget()->ReleaseCapture();
 972
 973   mouse_move_direction_ = kMovedMouseLeft | kMovedMouseRight;
 974
 975   std::vector<gfx::Rect> drag_bounds = CalculateBoundsForDraggedTabs();
 976   TabStripModel* attached_model = GetModel(attached_tabstrip_);
 977   std::vector<TabRendererData> tab_data;
 978   for (size_t i = 0; i < drag_data_.size(); ++i) {
 979     tab_data.push_back(drag_data_[i].attached_tab->data());
 980     int index = attached_model->GetIndexOfWebContents(drag_data_[i].contents);
 981     DCHECK_NE(-1, index);
 982
 983     // Hide the tab so that the user doesn't see it animate closed.
 984     drag_data_[i].attached_tab->SetVisible(false);
 985     drag_data_[i].attached_tab->set_detached();
 986
 987     attached_model->DetachWebContentsAt(index);
 988
 989     // Detaching may end up deleting the tab, drop references to it.
 990     drag_data_[i].attached_tab = NULL;
 991   }
 992
 993   // If we've removed the last Tab from the TabStrip, hide the frame now.
 994   if (!attached_model->empty()) {
 995     if (!selection_model_before_attach_.empty() &&
 996         selection_model_before_attach_.active() >= 0 &&
 997         selection_model_before_attach_.active() < attached_model->count()) {
 998       // Restore the selection.
 999       attached_model->SetSelectionFromModel(selection_model_before_attach_);
1000     } else if (attached_tabstrip_ == source_tabstrip_ &&
1001                !initial_selection_model_.empty()) {
1002       RestoreInitialSelection();
1003     }
1004   }
1005
1006   attached_tabstrip_->DraggedTabsDetached();
1007   attached_tabstrip_ = NULL;
1008 }
1009
1010 void TabDragController::DetachIntoNewBrowserAndRunMoveLoop(
1011     const gfx::Point& point_in_screen) {
1012   if (GetModel(attached_tabstrip_)->count() ==
1013       static_cast<int>(drag_data_.size())) {
1014     // All the tabs in a browser are being dragged but all the tabs weren't
1015     // initially being dragged. For this to happen the user would have to
1016     // start dragging a set of tabs, the other tabs close, then detach.
1017     RunMoveLoop(GetWindowOffset(point_in_screen));
1018     return;
1019   }
1020
1021   const int last_tabstrip_width = attached_tabstrip_->tab_area_width();
1022   std::vector<gfx::Rect> drag_bounds = CalculateBoundsForDraggedTabs();
1023   OffsetX(GetAttachedDragPoint(point_in_screen).x(), &drag_bounds);
1024
1025   gfx::Vector2d drag_offset;
1026   Browser* browser = CreateBrowserForDrag(
1027       attached_tabstrip_, point_in_screen, &drag_offset, &drag_bounds);
1028
1029   BrowserView* dragged_browser_view =
1030       BrowserView::GetBrowserViewForBrowser(browser);
1031   views::Widget* dragged_widget = dragged_browser_view->GetWidget();
1032
1033 #if defined(USE_AURA)
1034   // Only Aura windows are gesture consumers.
1035   gfx::NativeView attached_native_view =
1036       attached_tabstrip_->GetWidget()->GetNativeView();
1037   ui::GestureRecognizer::Get()->TransferEventsTo(
1038       attached_native_view, dragged_widget->GetNativeView());
1039 #endif
1040
1041   Detach(can_release_capture_ ? RELEASE_CAPTURE : DONT_RELEASE_CAPTURE);
1042
1043   dragged_widget->SetVisibilityChangedAnimationsEnabled(false);
1044   Attach(dragged_browser_view->tabstrip(), gfx::Point());
1045   AdjustBrowserAndTabBoundsForDrag(last_tabstrip_width,
1046                                    point_in_screen,
1047                                    &drag_bounds);
1048   WindowPositionManagedUpdater updater;
1049   dragged_widget->AddObserver(&updater);
1050   browser->window()->Show();
1051   dragged_widget->RemoveObserver(&updater);
1052   dragged_widget->SetVisibilityChangedAnimationsEnabled(true);
1053   // Activate may trigger a focus loss, destroying us.
1054   {
1055     base::WeakPtr<TabDragController> ref(weak_factory_.GetWeakPtr());
1056     browser->window()->Activate();
1057     if (!ref)
1058       return;
1059   }
1060   RunMoveLoop(drag_offset);
1061 }
1062
1063 void TabDragController::RunMoveLoop(const gfx::Vector2d& drag_offset) {
1064   // If the user drags the whole window we'll assume they are going to attach to
1065   // another window and therefore want to reorder.
1066   move_behavior_ = REORDER;
1067
1068   move_loop_widget_ = GetAttachedBrowserWidget();
1069   DCHECK(move_loop_widget_);
1070   move_loop_widget_->AddObserver(this);
1071   is_dragging_window_ = true;
1072   base::WeakPtr<TabDragController> ref(weak_factory_.GetWeakPtr());
1073   if (can_release_capture_) {
1074     // Running the move loop releases mouse capture, which triggers destroying
1075     // the drag loop. Release mouse capture now while the DragController is not
1076     // owned by the TabStrip.
1077     attached_tabstrip_->ReleaseDragController();
1078     attached_tabstrip_->GetWidget()->ReleaseCapture();
1079     attached_tabstrip_->OwnDragController(this);
1080   }
1081   const views::Widget::MoveLoopSource move_loop_source =
1082       event_source_ == EVENT_SOURCE_MOUSE ?
1083       views::Widget::MOVE_LOOP_SOURCE_MOUSE :
1084       views::Widget::MOVE_LOOP_SOURCE_TOUCH;
1085   const views::Widget::MoveLoopEscapeBehavior escape_behavior =
1086       is_dragging_new_browser_ ?
1087           views::Widget::MOVE_LOOP_ESCAPE_BEHAVIOR_HIDE :
1088           views::Widget::MOVE_LOOP_ESCAPE_BEHAVIOR_DONT_HIDE;
1089   views::Widget::MoveLoopResult result =
1090       move_loop_widget_->RunMoveLoop(
1091           drag_offset, move_loop_source, escape_behavior);
1092   content::NotificationService::current()->Notify(
1093       chrome::NOTIFICATION_TAB_DRAG_LOOP_DONE,
1094       content::NotificationService::AllBrowserContextsAndSources(),
1095       content::NotificationService::NoDetails());
1096
1097   if (!ref)
1098     return;
1099   if (move_loop_widget_) {
1100     move_loop_widget_->RemoveObserver(this);
1101     move_loop_widget_ = NULL;
1102   }
1103   is_dragging_window_ = false;
1104   waiting_for_run_loop_to_exit_ = false;
1105   if (end_run_loop_behavior_ == END_RUN_LOOP_CONTINUE_DRAGGING) {
1106     end_run_loop_behavior_ = END_RUN_LOOP_STOP_DRAGGING;
1107     if (tab_strip_to_attach_to_after_exit_) {
1108       gfx::Point point_in_screen(GetCursorScreenPoint());
1109       Detach(DONT_RELEASE_CAPTURE);
1110       Attach(tab_strip_to_attach_to_after_exit_, point_in_screen);
1111       // Move the tabs into position.
1112       MoveAttached(point_in_screen);
1113       attached_tabstrip_->GetWidget()->Activate();
1114       // Activate may trigger a focus loss, destroying us.
1115       if (!ref)
1116         return;
1117       tab_strip_to_attach_to_after_exit_ = NULL;
1118     }
1119     DCHECK(attached_tabstrip_);
1120     attached_tabstrip_->GetWidget()->SetCapture(attached_tabstrip_);
1121   } else if (active_) {
1122     EndDrag(result == views::Widget::MOVE_LOOP_CANCELED ?
1123             END_DRAG_CANCEL : END_DRAG_COMPLETE);
1124   }
1125 }
1126
1127 int TabDragController::GetInsertionIndexFrom(const gfx::Rect& dragged_bounds,
1128                                              int start) const {
1129   const int last_tab = attached_tabstrip_->tab_count() - 1;
1130   // Make the actual "drag insertion point" be just after the leading edge of
1131   // the first dragged tab.  This is closer to where the user thinks of the tab
1132   // as "starting" than just dragged_bounds.x(), especially with narrow tabs.
1133   const int dragged_x = dragged_bounds.x() + Tab::leading_width_for_drag();
1134   if (start < 0 || start > last_tab ||
1135       dragged_x < attached_tabstrip_->ideal_bounds(start).x())
1136     return -1;
1137
1138   for (int i = start; i <= last_tab; ++i) {
1139     const gfx::Rect& ideal_bounds = attached_tabstrip_->ideal_bounds(i);
1140     if (dragged_x < (ideal_bounds.x() + (ideal_bounds.width() / 2)))
1141       return i;
1142   }
1143
1144   return (dragged_x < attached_tabstrip_->ideal_bounds(last_tab).right()) ?
1145       (last_tab + 1) : -1;
1146 }
1147
1148 int TabDragController::GetInsertionIndexFromReversed(
1149     const gfx::Rect& dragged_bounds,
1150     int start) const {
1151   // Make the actual "drag insertion point" be just after the leading edge of
1152   // the first dragged tab.  This is closer to where the user thinks of the tab
1153   // as "starting" than just dragged_bounds.x(), especially with narrow tabs.
1154   const int dragged_x = dragged_bounds.x() + Tab::leading_width_for_drag();
1155   if (start < 0 || start >= attached_tabstrip_->tab_count() ||
1156       dragged_x >= attached_tabstrip_->ideal_bounds(start).right())
1157     return -1;
1158
1159   for (int i = start; i >= 0; --i) {
1160     const gfx::Rect& ideal_bounds = attached_tabstrip_->ideal_bounds(i);
1161     if (dragged_x >= (ideal_bounds.x() + (ideal_bounds.width() / 2)))
1162       return i + 1;
1163   }
1164
1165   return (dragged_x >= attached_tabstrip_->ideal_bounds(0).x()) ? 0 : -1;
1166 }
1167
1168 int TabDragController::GetInsertionIndexForDraggedBounds(
1169     const gfx::Rect& dragged_bounds) const {
1170   // If the strip has no tabs, the only position to insert at is 0.
1171   const int tab_count = attached_tabstrip_->tab_count();
1172   if (!tab_count)
1173     return 0;
1174
1175   int index = -1;
1176   if (attached_tabstrip_->touch_layout_.get()) {
1177     index = GetInsertionIndexForDraggedBoundsStacked(dragged_bounds);
1178     if (index != -1) {
1179       // Only move the tab to the left/right if the user actually moved the
1180       // mouse that way. This is necessary as tabs with stacked tabs
1181       // before/after them have multiple drag positions.
1182       int active_index = attached_tabstrip_->touch_layout_->active_index();
1183       if ((index < active_index &&
1184            (mouse_move_direction_ & kMovedMouseLeft) == 0) ||
1185           (index > active_index &&
1186            (mouse_move_direction_ & kMovedMouseRight) == 0)) {
1187         index = active_index;
1188       }
1189     }
1190   } else {
1191     index = GetInsertionIndexFrom(dragged_bounds, 0);
1192   }
1193   if (index == -1) {
1194     const int last_tab_right =
1195         attached_tabstrip_->ideal_bounds(tab_count - 1).right();
1196     index = (dragged_bounds.right() > last_tab_right) ? tab_count : 0;
1197   }
1198
1199   const Tab* last_visible_tab = attached_tabstrip_->GetLastVisibleTab();
1200   int last_insertion_point = last_visible_tab ?
1201       (attached_tabstrip_->GetModelIndexOfTab(last_visible_tab) + 1) : 0;
1202   if (drag_data_[0].attached_tab) {
1203     // We're not in the process of attaching, so clamp the insertion point to
1204     // keep it within the visible region.
1205     last_insertion_point = std::max(
1206         0, last_insertion_point - static_cast<int>(drag_data_.size()));
1207   }
1208
1209   // Ensure the first dragged tab always stays in the visible index range.
1210   return std::min(index, last_insertion_point);
1211 }
1212
1213 bool TabDragController::ShouldDragToNextStackedTab(
1214     const gfx::Rect& dragged_bounds,
1215     int index) const {
1216   if (index + 1 >= attached_tabstrip_->tab_count() ||
1217       !attached_tabstrip_->touch_layout_->IsStacked(index + 1) ||
1218       (mouse_move_direction_ & kMovedMouseRight) == 0)
1219     return false;
1220
1221   int active_x = attached_tabstrip_->ideal_bounds(index).x();
1222   int next_x = attached_tabstrip_->ideal_bounds(index + 1).x();
1223   int mid_x = std::min(next_x - kStackedDistance,
1224                        active_x + (next_x - active_x) / 4);
1225   // TODO(pkasting): Should this add Tab::leading_width_for_drag() as
1226   // GetInsertionIndexFrom() does?
1227   return dragged_bounds.x() >= mid_x;
1228 }
1229
1230 bool TabDragController::ShouldDragToPreviousStackedTab(
1231     const gfx::Rect& dragged_bounds,
1232     int index) const {
1233   if (index - 1 < attached_tabstrip_->GetMiniTabCount() ||
1234       !attached_tabstrip_->touch_layout_->IsStacked(index - 1) ||
1235       (mouse_move_direction_ & kMovedMouseLeft) == 0)
1236     return false;
1237
1238   int active_x = attached_tabstrip_->ideal_bounds(index).x();
1239   int previous_x = attached_tabstrip_->ideal_bounds(index - 1).x();
1240   int mid_x = std::max(previous_x + kStackedDistance,
1241                        active_x - (active_x - previous_x) / 4);
1242   // TODO(pkasting): Should this add Tab::leading_width_for_drag() as
1243   // GetInsertionIndexFrom() does?
1244   return dragged_bounds.x() <= mid_x;
1245 }
1246
1247 int TabDragController::GetInsertionIndexForDraggedBoundsStacked(
1248     const gfx::Rect& dragged_bounds) const {
1249   StackedTabStripLayout* touch_layout = attached_tabstrip_->touch_layout_.get();
1250   int active_index = touch_layout->active_index();
1251   // Search from the active index to the front of the tabstrip. Do this as tabs
1252   // overlap each other from the active index.
1253   int index = GetInsertionIndexFromReversed(dragged_bounds, active_index);
1254   if (index != active_index)
1255     return index;
1256   if (index == -1)
1257     return GetInsertionIndexFrom(dragged_bounds, active_index + 1);
1258
1259   // The position to drag to corresponds to the active tab. If the next/previous
1260   // tab is stacked, then shorten the distance used to determine insertion
1261   // bounds. We do this as GetInsertionIndexFrom() uses the bounds of the
1262   // tabs. When tabs are stacked the next/previous tab is on top of the tab.
1263   if (active_index + 1 < attached_tabstrip_->tab_count() &&
1264       touch_layout->IsStacked(active_index + 1)) {
1265     index = GetInsertionIndexFrom(dragged_bounds, active_index + 1);
1266     if (index == -1 && ShouldDragToNextStackedTab(dragged_bounds, active_index))
1267       index = active_index + 1;
1268     else if (index == -1)
1269       index = active_index;
1270   } else if (ShouldDragToPreviousStackedTab(dragged_bounds, active_index)) {
1271     index = active_index - 1;
1272   }
1273   return index;
1274 }
1275
1276 gfx::Rect TabDragController::GetDraggedViewTabStripBounds(
1277     const gfx::Point& tab_strip_point) {
1278   // attached_tab is NULL when inserting into a new tabstrip.
1279   if (source_tab_drag_data()->attached_tab) {
1280     return gfx::Rect(tab_strip_point.x(), tab_strip_point.y(),
1281                      source_tab_drag_data()->attached_tab->width(),
1282                      source_tab_drag_data()->attached_tab->height());
1283   }
1284
1285   double sel_width, unselected_width;
1286   attached_tabstrip_->GetCurrentTabWidths(&sel_width, &unselected_width);
1287   return gfx::Rect(tab_strip_point.x(), tab_strip_point.y(),
1288                    static_cast<int>(sel_width),
1289                    Tab::GetStandardSize().height());
1290 }
1291
1292 gfx::Point TabDragController::GetAttachedDragPoint(
1293     const gfx::Point& point_in_screen) {
1294   DCHECK(attached_tabstrip_);  // The tab must be attached.
1295
1296   gfx::Point tab_loc(point_in_screen);
1297   views::View::ConvertPointFromScreen(attached_tabstrip_, &tab_loc);
1298   const int x =
1299       attached_tabstrip_->GetMirroredXInView(tab_loc.x()) - mouse_offset_.x();
1300
1301   // TODO: consider caching this.
1302   std::vector<Tab*> attached_tabs;
1303   for (size_t i = 0; i < drag_data_.size(); ++i)
1304     attached_tabs.push_back(drag_data_[i].attached_tab);
1305   const int size = attached_tabstrip_->GetSizeNeededForTabs(attached_tabs);
1306   const int max_x = attached_tabstrip_->width() - size;
1307   return gfx::Point(std::min(std::max(x, 0), max_x), 0);
1308 }
1309
1310 std::vector<Tab*> TabDragController::GetTabsMatchingDraggedContents(
1311     TabStrip* tabstrip) {
1312   TabStripModel* model = GetModel(attached_tabstrip_);
1313   std::vector<Tab*> tabs;
1314   for (size_t i = 0; i < drag_data_.size(); ++i) {
1315     int model_index = model->GetIndexOfWebContents(drag_data_[i].contents);
1316     if (model_index == TabStripModel::kNoTab)
1317       return std::vector<Tab*>();
1318     tabs.push_back(tabstrip->tab_at(model_index));
1319   }
1320   return tabs;
1321 }
1322
1323 std::vector<gfx::Rect> TabDragController::CalculateBoundsForDraggedTabs() {
1324   std::vector<gfx::Rect> drag_bounds;
1325   std::vector<Tab*> attached_tabs;
1326   for (size_t i = 0; i < drag_data_.size(); ++i)
1327     attached_tabs.push_back(drag_data_[i].attached_tab);
1328   attached_tabstrip_->CalculateBoundsForDraggedTabs(attached_tabs,
1329                                                     &drag_bounds);
1330   return drag_bounds;
1331 }
1332
1333 void TabDragController::EndDragImpl(EndDragType type) {
1334   DCHECK(active_);
1335   active_ = false;
1336
1337   bring_to_front_timer_.Stop();
1338   move_stacked_timer_.Stop();
1339
1340   if (is_dragging_window_) {
1341     waiting_for_run_loop_to_exit_ = true;
1342
1343     if (type == NORMAL || (type == TAB_DESTROYED && drag_data_.size() > 1)) {
1344       SetWindowPositionManaged(GetAttachedBrowserWidget()->GetNativeWindow(),
1345                                true);
1346     }
1347
1348     // End the nested drag loop.
1349     GetAttachedBrowserWidget()->EndMoveLoop();
1350   }
1351
1352   if (type != TAB_DESTROYED) {
1353     // We only finish up the drag if we were actually dragging. If start_drag_
1354     // is false, the user just clicked and released and didn't move the mouse
1355     // enough to trigger a drag.
1356     if (started_drag_) {
1357       RestoreFocus();
1358       if (type == CANCELED)
1359         RevertDrag();
1360       else
1361         CompleteDrag();
1362     }
1363   } else if (drag_data_.size() > 1) {
1364     initial_selection_model_.Clear();
1365     if (started_drag_)
1366       RevertDrag();
1367   }  // else case the only tab we were dragging was deleted. Nothing to do.
1368
1369   // Clear out drag data so we don't attempt to do anything with it.
1370   drag_data_.clear();
1371
1372   TabStrip* owning_tabstrip = attached_tabstrip_ ?
1373       attached_tabstrip_ : source_tabstrip_;
1374   owning_tabstrip->DestroyDragController();
1375 }
1376
1377 void TabDragController::RevertDrag() {
1378   std::vector<Tab*> tabs;
1379   for (size_t i = 0; i < drag_data_.size(); ++i) {
1380     if (drag_data_[i].contents) {
1381       // Contents is NULL if a tab was destroyed while the drag was under way.
1382       tabs.push_back(drag_data_[i].attached_tab);
1383       RevertDragAt(i);
1384     }
1385   }
1386
1387   if (attached_tabstrip_) {
1388     if (did_restore_window_)
1389       MaximizeAttachedWindow();
1390     if (attached_tabstrip_ == source_tabstrip_) {
1391       source_tabstrip_->StoppedDraggingTabs(
1392           tabs, initial_tab_positions_, move_behavior_ == MOVE_VISIBILE_TABS,
1393           false);
1394     } else {
1395       attached_tabstrip_->DraggedTabsDetached();
1396     }
1397   }
1398
1399   if (initial_selection_model_.empty())
1400     ResetSelection(GetModel(source_tabstrip_));
1401   else
1402     GetModel(source_tabstrip_)->SetSelectionFromModel(initial_selection_model_);
1403
1404   if (source_tabstrip_)
1405     source_tabstrip_->GetWidget()->Activate();
1406 }
1407
1408 void TabDragController::ResetSelection(TabStripModel* model) {
1409   DCHECK(model);
1410   ui::ListSelectionModel selection_model;
1411   bool has_one_valid_tab = false;
1412   for (size_t i = 0; i < drag_data_.size(); ++i) {
1413     // |contents| is NULL if a tab was deleted out from under us.
1414     if (drag_data_[i].contents) {
1415       int index = model->GetIndexOfWebContents(drag_data_[i].contents);
1416       DCHECK_NE(-1, index);
1417       selection_model.AddIndexToSelection(index);
1418       if (!has_one_valid_tab || i == source_tab_index_) {
1419         // Reset the active/lead to the first tab. If the source tab is still
1420         // valid we'll reset these again later on.
1421         selection_model.set_active(index);
1422         selection_model.set_anchor(index);
1423         has_one_valid_tab = true;
1424       }
1425     }
1426   }
1427   if (!has_one_valid_tab)
1428     return;
1429
1430   model->SetSelectionFromModel(selection_model);
1431 }
1432
1433 void TabDragController::RestoreInitialSelection() {
1434   // First time detaching from the source tabstrip. Reset selection model to
1435   // initial_selection_model_. Before resetting though we have to remove all
1436   // the tabs from initial_selection_model_ as it was created with the tabs
1437   // still there.
1438   ui::ListSelectionModel selection_model;
1439   selection_model.Copy(initial_selection_model_);
1440   for (DragData::const_reverse_iterator i(drag_data_.rbegin());
1441        i != drag_data_.rend(); ++i) {
1442     selection_model.DecrementFrom(i->source_model_index);
1443   }
1444   // We may have cleared out the selection model. Only reset it if it
1445   // contains something.
1446   if (selection_model.empty())
1447     return;
1448
1449   // The anchor/active may have been among the tabs that were dragged out. Force
1450   // the anchor/active to be valid.
1451   if (selection_model.anchor() == ui::ListSelectionModel::kUnselectedIndex)
1452     selection_model.set_anchor(selection_model.selected_indices()[0]);
1453   if (selection_model.active() == ui::ListSelectionModel::kUnselectedIndex)
1454     selection_model.set_active(selection_model.selected_indices()[0]);
1455   GetModel(source_tabstrip_)->SetSelectionFromModel(selection_model);
1456 }
1457
1458 void TabDragController::RevertDragAt(size_t drag_index) {
1459   DCHECK(started_drag_);
1460   DCHECK(source_tabstrip_);
1461
1462   base::AutoReset<bool> setter(&is_mutating_, true);
1463   TabDragData* data = &(drag_data_[drag_index]);
1464   if (attached_tabstrip_) {
1465     int index =
1466         GetModel(attached_tabstrip_)->GetIndexOfWebContents(data->contents);
1467     if (attached_tabstrip_ != source_tabstrip_) {
1468       // The Tab was inserted into another TabStrip. We need to put it back
1469       // into the original one.
1470       GetModel(attached_tabstrip_)->DetachWebContentsAt(index);
1471       // TODO(beng): (Cleanup) seems like we should use Attach() for this
1472       //             somehow.
1473       GetModel(source_tabstrip_)->InsertWebContentsAt(
1474           data->source_model_index, data->contents,
1475           (data->pinned ? TabStripModel::ADD_PINNED : 0));
1476     } else {
1477       // The Tab was moved within the TabStrip where the drag was initiated.
1478       // Move it back to the starting location.
1479       GetModel(source_tabstrip_)->MoveWebContentsAt(
1480           index, data->source_model_index, false);
1481     }
1482   } else {
1483     // The Tab was detached from the TabStrip where the drag began, and has not
1484     // been attached to any other TabStrip. We need to put it back into the
1485     // source TabStrip.
1486     GetModel(source_tabstrip_)->InsertWebContentsAt(
1487         data->source_model_index, data->contents,
1488         (data->pinned ? TabStripModel::ADD_PINNED : 0));
1489   }
1490 }
1491
1492 void TabDragController::CompleteDrag() {
1493   DCHECK(started_drag_);
1494
1495   if (attached_tabstrip_) {
1496     if (is_dragging_new_browser_ || did_restore_window_) {
1497       if (IsDockedOrSnapped(attached_tabstrip_)) {
1498         was_source_maximized_ = false;
1499         was_source_fullscreen_ = false;
1500       }
1501
1502       // If source window was maximized - maximize the new window as well.
1503       if (was_source_maximized_ || was_source_fullscreen_)
1504         MaximizeAttachedWindow();
1505     }
1506     attached_tabstrip_->StoppedDraggingTabs(
1507         GetTabsMatchingDraggedContents(attached_tabstrip_),
1508         initial_tab_positions_,
1509         move_behavior_ == MOVE_VISIBILE_TABS,
1510         true);
1511   } else {
1512     // Compel the model to construct a new window for the detached
1513     // WebContentses.
1514     views::Widget* widget = source_tabstrip_->GetWidget();
1515     gfx::Rect window_bounds(widget->GetRestoredBounds());
1516     window_bounds.set_origin(GetWindowCreatePoint(last_point_in_screen_));
1517
1518     base::AutoReset<bool> setter(&is_mutating_, true);
1519
1520     std::vector<TabStripModelDelegate::NewStripContents> contentses;
1521     for (size_t i = 0; i < drag_data_.size(); ++i) {
1522       TabStripModelDelegate::NewStripContents item;
1523       item.web_contents = drag_data_[i].contents;
1524       item.add_types = drag_data_[i].pinned ? TabStripModel::ADD_PINNED
1525                                             : TabStripModel::ADD_NONE;
1526       contentses.push_back(item);
1527     }
1528
1529     Browser* new_browser =
1530         GetModel(source_tabstrip_)->delegate()->CreateNewStripWithContents(
1531             contentses, window_bounds, widget->IsMaximized());
1532     ResetSelection(new_browser->tab_strip_model());
1533     new_browser->window()->Show();
1534   }
1535 }
1536
1537 void TabDragController::MaximizeAttachedWindow() {
1538   GetAttachedBrowserWidget()->Maximize();
1539 #if defined(USE_ASH)
1540   if (was_source_fullscreen_ &&
1541       host_desktop_type_ == chrome::HOST_DESKTOP_TYPE_ASH) {
1542     // In fullscreen mode it is only possible to get here if the source
1543     // was in "immersive fullscreen" mode, so toggle it back on.
1544     ash::accelerators::ToggleFullscreen();
1545   }
1546 #endif
1547 }
1548
1549 gfx::Rect TabDragController::GetViewScreenBounds(
1550     views::View* view) const {
1551   gfx::Point view_topleft;
1552   views::View::ConvertPointToScreen(view, &view_topleft);
1553   gfx::Rect view_screen_bounds = view->GetLocalBounds();
1554   view_screen_bounds.Offset(view_topleft.x(), view_topleft.y());
1555   return view_screen_bounds;
1556 }
1557
1558 void TabDragController::BringWindowUnderPointToFront(
1559     const gfx::Point& point_in_screen) {
1560   gfx::NativeWindow window = GetLocalProcessWindow(point_in_screen, true);
1561
1562   // Only bring browser windows to front - only windows with a TabStrip can
1563   // be tab drag targets.
1564   if (!GetTabStripForWindow(window))
1565     return;
1566
1567   if (window) {
1568     views::Widget* widget_window = views::Widget::GetWidgetForNativeWindow(
1569         window);
1570     if (!widget_window)
1571       return;
1572
1573 #if defined(USE_ASH)
1574     if (host_desktop_type_ == chrome::HOST_DESKTOP_TYPE_ASH) {
1575       // TODO(varkha): The code below ensures that the phantom drag widget
1576       // is shown on top of browser windows. The code should be moved to ash/
1577       // and the phantom should be able to assert its top-most state on its own.
1578       // One strategy would be for DragWindowController to
1579       // be able to observe stacking changes to the phantom drag widget's
1580       // siblings in order to keep it on top. One way is to implement a
1581       // notification that is sent to a window parent's observers when a
1582       // stacking order is changed among the children of that same parent.
1583       // Note that OnWindowStackingChanged is sent only to the child that is the
1584       // argument of one of the Window::StackChildX calls and not to all its
1585       // siblings affected by the stacking change.
1586       aura::Window* browser_window = widget_window->GetNativeView();
1587       // Find a topmost non-popup window and stack the recipient browser above
1588       // it in order to avoid stacking the browser window on top of the phantom
1589       // drag widget created by DragWindowController in a second display.
1590       for (aura::Window::Windows::const_reverse_iterator it =
1591            browser_window->parent()->children().rbegin();
1592            it != browser_window->parent()->children().rend(); ++it) {
1593         // If the iteration reached the recipient browser window then it is
1594         // already topmost and it is safe to return with no stacking change.
1595         if (*it == browser_window)
1596           return;
1597         if ((*it)->type() != ui::wm::WINDOW_TYPE_POPUP) {
1598           widget_window->StackAbove(*it);
1599           break;
1600         }
1601       }
1602     } else {
1603       widget_window->StackAtTop();
1604     }
1605 #else
1606     widget_window->StackAtTop();
1607 #endif
1608
1609     // The previous call made the window appear on top of the dragged window,
1610     // move the dragged window to the front.
1611     if (is_dragging_window_)
1612       attached_tabstrip_->GetWidget()->StackAtTop();
1613   }
1614 }
1615
1616 TabStripModel* TabDragController::GetModel(
1617     TabStrip* tabstrip) const {
1618   return static_cast<BrowserTabStripController*>(tabstrip->controller())->
1619       model();
1620 }
1621
1622 views::Widget* TabDragController::GetAttachedBrowserWidget() {
1623   return attached_tabstrip_->GetWidget();
1624 }
1625
1626 bool TabDragController::AreTabsConsecutive() {
1627   for (size_t i = 1; i < drag_data_.size(); ++i) {
1628     if (drag_data_[i - 1].source_model_index + 1 !=
1629         drag_data_[i].source_model_index) {
1630       return false;
1631     }
1632   }
1633   return true;
1634 }
1635
1636 gfx::Rect TabDragController::CalculateDraggedBrowserBounds(
1637     TabStrip* source,
1638     const gfx::Point& point_in_screen,
1639     std::vector<gfx::Rect>* drag_bounds) {
1640   gfx::Point center(0, source->height() / 2);
1641   views::View::ConvertPointToWidget(source, &center);
1642   gfx::Rect new_bounds(source->GetWidget()->GetRestoredBounds());
1643   if (source->GetWidget()->IsMaximized()) {
1644     // If the restore bounds is really small, we don't want to honor it
1645     // (dragging a really small window looks wrong), instead make sure the new
1646     // window is at least 50% the size of the old.
1647     const gfx::Size max_size(
1648         source->GetWidget()->GetWindowBoundsInScreen().size());
1649     new_bounds.set_width(
1650         std::max(max_size.width() / 2, new_bounds.width()));
1651     new_bounds.set_height(
1652         std::max(max_size.height() / 2, new_bounds.height()));
1653   }
1654   new_bounds.set_y(point_in_screen.y() - center.y());
1655   switch (GetDetachPosition(point_in_screen)) {
1656     case DETACH_BEFORE:
1657       new_bounds.set_x(point_in_screen.x() - center.x());
1658       new_bounds.Offset(-mouse_offset_.x(), 0);
1659       break;
1660     case DETACH_AFTER: {
1661       gfx::Point right_edge(source->width(), 0);
1662       views::View::ConvertPointToWidget(source, &right_edge);
1663       new_bounds.set_x(point_in_screen.x() - right_edge.x());
1664       new_bounds.Offset(drag_bounds->back().right() - mouse_offset_.x(), 0);
1665       OffsetX(-(*drag_bounds)[0].x(), drag_bounds);
1666       break;
1667     }
1668     default:
1669       break; // Nothing to do for DETACH_ABOVE_OR_BELOW.
1670   }
1671
1672   // To account for the extra vertical on restored windows that is absent on
1673   // maximized windows, add an additional vertical offset extracted from the tab
1674   // strip.
1675   if (source->GetWidget()->IsMaximized())
1676     new_bounds.Offset(0, -source->kNewTabButtonVerticalOffset);
1677   return new_bounds;
1678 }
1679
1680 void TabDragController::AdjustBrowserAndTabBoundsForDrag(
1681     int last_tabstrip_width,
1682     const gfx::Point& point_in_screen,
1683     std::vector<gfx::Rect>* drag_bounds) {
1684   attached_tabstrip_->InvalidateLayout();
1685   attached_tabstrip_->DoLayout();
1686   const int dragged_tabstrip_width = attached_tabstrip_->tab_area_width();
1687
1688   // If the new tabstrip is smaller than the old resize the tabs.
1689   if (dragged_tabstrip_width < last_tabstrip_width) {
1690     const float leading_ratio =
1691         drag_bounds->front().x() / static_cast<float>(last_tabstrip_width);
1692     *drag_bounds = CalculateBoundsForDraggedTabs();
1693
1694     if (drag_bounds->back().right() < dragged_tabstrip_width) {
1695       const int delta_x =
1696           std::min(static_cast<int>(leading_ratio * dragged_tabstrip_width),
1697                    dragged_tabstrip_width -
1698                        (drag_bounds->back().right() -
1699                         drag_bounds->front().x()));
1700       OffsetX(delta_x, drag_bounds);
1701     }
1702
1703     // Reposition the restored window such that the tab that was dragged remains
1704     // under the mouse cursor.
1705     gfx::Point offset(
1706         static_cast<int>((*drag_bounds)[source_tab_index_].width() *
1707                          offset_to_width_ratio_) +
1708         (*drag_bounds)[source_tab_index_].x(), 0);
1709     views::View::ConvertPointToWidget(attached_tabstrip_, &offset);
1710     gfx::Rect bounds = GetAttachedBrowserWidget()->GetWindowBoundsInScreen();
1711     bounds.set_x(point_in_screen.x() - offset.x());
1712     GetAttachedBrowserWidget()->SetBounds(bounds);
1713   }
1714   attached_tabstrip_->SetTabBoundsForDrag(*drag_bounds);
1715 }
1716
1717 Browser* TabDragController::CreateBrowserForDrag(
1718     TabStrip* source,
1719     const gfx::Point& point_in_screen,
1720     gfx::Vector2d* drag_offset,
1721     std::vector<gfx::Rect>* drag_bounds) {
1722   gfx::Rect new_bounds(CalculateDraggedBrowserBounds(source,
1723                                                      point_in_screen,
1724                                                      drag_bounds));
1725   *drag_offset = point_in_screen - new_bounds.origin();
1726
1727   Profile* profile =
1728       Profile::FromBrowserContext(drag_data_[0].contents->GetBrowserContext());
1729   Browser::CreateParams create_params(Browser::TYPE_TABBED,
1730                                       profile,
1731                                       host_desktop_type_);
1732   create_params.initial_bounds = new_bounds;
1733   Browser* browser = new Browser(create_params);
1734   is_dragging_new_browser_ = true;
1735   SetWindowPositionManaged(browser->window()->GetNativeWindow(), false);
1736   // If the window is created maximized then the bounds we supplied are ignored.
1737   // We need to reset them again so they are honored.
1738   browser->window()->SetBounds(new_bounds);
1739
1740   return browser;
1741 }
1742
1743 gfx::Point TabDragController::GetCursorScreenPoint() {
1744 #if defined(USE_ASH)
1745   if (host_desktop_type_ == chrome::HOST_DESKTOP_TYPE_ASH &&
1746       event_source_ == EVENT_SOURCE_TOUCH &&
1747       aura::Env::GetInstance()->is_touch_down()) {
1748     views::Widget* widget = GetAttachedBrowserWidget();
1749     DCHECK(widget);
1750     aura::Window* widget_window = widget->GetNativeWindow();
1751     DCHECK(widget_window->GetRootWindow());
1752     gfx::PointF touch_point_f;
1753     bool got_touch_point = ui::GestureRecognizer::Get()->
1754         GetLastTouchPointForTarget(widget_window, &touch_point_f);
1755     // TODO(tdresser): Switch to using gfx::PointF. See crbug.com/337824.
1756     gfx::Point touch_point = gfx::ToFlooredPoint(touch_point_f);
1757     DCHECK(got_touch_point);
1758     wm::ConvertPointToScreen(widget_window->GetRootWindow(), &touch_point);
1759     return touch_point;
1760   }
1761 #endif
1762
1763   return screen_->GetCursorScreenPoint();
1764 }
1765
1766 gfx::Vector2d TabDragController::GetWindowOffset(
1767     const gfx::Point& point_in_screen) {
1768   TabStrip* owning_tabstrip = attached_tabstrip_ ?
1769       attached_tabstrip_ : source_tabstrip_;
1770   views::View* toplevel_view = owning_tabstrip->GetWidget()->GetContentsView();
1771
1772   gfx::Point point = point_in_screen;
1773   views::View::ConvertPointFromScreen(toplevel_view, &point);
1774   return point.OffsetFromOrigin();
1775 }
1776
1777 gfx::NativeWindow TabDragController::GetLocalProcessWindow(
1778     const gfx::Point& screen_point,
1779     bool exclude_dragged_view) {
1780   std::set<gfx::NativeWindow> exclude;
1781   if (exclude_dragged_view) {
1782     gfx::NativeWindow dragged_window =
1783         attached_tabstrip_->GetWidget()->GetNativeWindow();
1784     if (dragged_window)
1785       exclude.insert(dragged_window);
1786   }
1787 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
1788   // Exclude windows which are pending deletion via Browser::TabStripEmpty().
1789   // These windows can be returned in the Linux Aura port because the browser
1790   // window which was used for dragging is not hidden once all of its tabs are
1791   // attached to another browser window in DragBrowserToNewTabStrip().
1792   // TODO(pkotwicz): Fix this properly (crbug.com/358482)
1793   BrowserList* browser_list = BrowserList::GetInstance(
1794       chrome::HOST_DESKTOP_TYPE_NATIVE);
1795   for (BrowserList::const_iterator it = browser_list->begin();
1796        it != browser_list->end(); ++it) {
1797     if ((*it)->tab_strip_model()->empty())
1798       exclude.insert((*it)->window()->GetNativeWindow());
1799   }
1800 #endif
1801   return GetLocalProcessWindowAtPoint(host_desktop_type_,
1802                                       screen_point,
1803                                       exclude);
1804
1805 }