src/ash/display/display_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 "ash/display/display_controller.h"
   6
   7 #include <algorithm>
   8 #include <cmath>
   9 #include <map>
  10
  11 #include "ash/ash_switches.h"
  12 #include "ash/display/cursor_window_controller.h"
  13 #include "ash/display/display_layout_store.h"
  14 #include "ash/display/display_manager.h"
  15 #include "ash/display/mirror_window_controller.h"
  16 #include "ash/display/root_window_transformers.h"
  17 #include "ash/host/ash_window_tree_host.h"
  18 #include "ash/host/ash_window_tree_host_init_params.h"
  19 #include "ash/host/root_window_transformer.h"
  20 #include "ash/root_window_controller.h"
  21 #include "ash/root_window_settings.h"
  22 #include "ash/screen_util.h"
  23 #include "ash/shell.h"
  24 #include "ash/shell_delegate.h"
  25 #include "ash/wm/coordinate_conversion.h"
  26 #include "base/command_line.h"
  27 #include "base/stl_util.h"
  28 #include "base/strings/stringprintf.h"
  29 #include "base/strings/utf_string_conversions.h"
  30 #include "ui/aura/client/capture_client.h"
  31 #include "ui/aura/client/focus_client.h"
  32 #include "ui/aura/client/screen_position_client.h"
  33 #include "ui/aura/window.h"
  34 #include "ui/aura/window_event_dispatcher.h"
  35 #include "ui/aura/window_property.h"
  36 #include "ui/aura/window_tracker.h"
  37 #include "ui/aura/window_tree_host.h"
  38 #include "ui/compositor/compositor.h"
  39 #include "ui/compositor/compositor_vsync_manager.h"
  40 #include "ui/gfx/display.h"
  41 #include "ui/gfx/screen.h"
  42 #include "ui/wm/public/activation_client.h"
  43
  44 #if defined(OS_CHROMEOS)
  45 #include "ash/display/display_configurator_animation.h"
  46 #include "base/sys_info.h"
  47 #include "base/time/time.h"
  48 #endif  // defined(OS_CHROMEOS)
  49
  50 #if defined(USE_X11)
  51 #include "ui/base/x/x11_util.h"
  52 #include "ui/gfx/x/x11_types.h"
  53
  54 // Including this at the bottom to avoid other
  55 // potential conflict with chrome headers.
  56 #include <X11/extensions/Xrandr.h>
  57 #undef RootWindow
  58 #endif  // defined(USE_X11)
  59
  60
  61 namespace ash {
  62 namespace {
  63
  64 // Primary display stored in global object as it can be
  65 // accessed after Shell is deleted. A separate display instance is created
  66 // during the shutdown instead of always keeping two display instances
  67 // (one here and another one in display_manager) in sync, which is error prone.
  68 // This is initialized in the constructor, and then in CreatePrimaryHost().
  69 int64 primary_display_id = -1;
  70
  71 // Specifies how long the display change should have been disabled
  72 // after each display change operations.
  73 // |kCycleDisplayThrottleTimeoutMs| is set to be longer to avoid
  74 // changing the settings while the system is still configurating
  75 // displays. It will be overriden by |kAfterDisplayChangeThrottleTimeoutMs|
  76 // when the display change happens, so the actual timeout is much shorter.
  77 const int64 kAfterDisplayChangeThrottleTimeoutMs = 500;
  78 const int64 kCycleDisplayThrottleTimeoutMs = 4000;
  79 const int64 kSwapDisplayThrottleTimeoutMs = 500;
  80
  81 DisplayManager* GetDisplayManager() {
  82   return Shell::GetInstance()->display_manager();
  83 }
  84
  85 void SetDisplayPropertiesOnHost(AshWindowTreeHost* ash_host,
  86                                 const gfx::Display& display) {
  87   DisplayInfo info = GetDisplayManager()->GetDisplayInfo(display.id());
  88   aura::WindowTreeHost* host = ash_host->AsWindowTreeHost();
  89 #if defined(OS_CHROMEOS) && defined(USE_X11)
  90   // Native window property (Atom in X11) that specifies the display's
  91   // rotation, scale factor and if it's internal display.  They are
  92   // read and used by touchpad/mouse driver directly on X (contact
  93   // adlr@ for more details on touchpad/mouse driver side). The value
  94   // of the rotation is one of 0 (normal), 1 (90 degrees clockwise), 2
  95   // (180 degree) or 3 (270 degrees clockwise).  The value of the
  96   // scale factor is in percent (100, 140, 200 etc).
  97   const char kRotationProp[] = "_CHROME_DISPLAY_ROTATION";
  98   const char kScaleFactorProp[] = "_CHROME_DISPLAY_SCALE_FACTOR";
  99   const char kInternalProp[] = "_CHROME_DISPLAY_INTERNAL";
 100   const char kCARDINAL[] = "CARDINAL";
 101   int xrandr_rotation = RR_Rotate_0;
 102   switch (info.rotation()) {
 103     case gfx::Display::ROTATE_0:
 104       xrandr_rotation = RR_Rotate_0;
 105       break;
 106     case gfx::Display::ROTATE_90:
 107       xrandr_rotation = RR_Rotate_90;
 108       break;
 109     case gfx::Display::ROTATE_180:
 110       xrandr_rotation = RR_Rotate_180;
 111       break;
 112     case gfx::Display::ROTATE_270:
 113       xrandr_rotation = RR_Rotate_270;
 114       break;
 115   }
 116
 117   int internal = display.IsInternal() ? 1 : 0;
 118   gfx::AcceleratedWidget xwindow = host->GetAcceleratedWidget();
 119   ui::SetIntProperty(xwindow, kInternalProp, kCARDINAL, internal);
 120   ui::SetIntProperty(xwindow, kRotationProp, kCARDINAL, xrandr_rotation);
 121   ui::SetIntProperty(xwindow,
 122                      kScaleFactorProp,
 123                      kCARDINAL,
 124                      100 * display.device_scale_factor());
 125 #endif
 126   scoped_ptr<RootWindowTransformer> transformer(
 127       CreateRootWindowTransformerForDisplay(host->window(), display));
 128   ash_host->SetRootWindowTransformer(transformer.Pass());
 129
 130   DisplayMode mode =
 131       GetDisplayManager()->GetActiveModeForDisplayId(display.id());
 132   if (mode.refresh_rate > 0.0f) {
 133     host->compositor()->vsync_manager()->SetAuthoritativeVSyncInterval(
 134         base::TimeDelta::FromMicroseconds(
 135             base::Time::kMicrosecondsPerSecond / mode.refresh_rate));
 136   }
 137 }
 138
 139 aura::Window* GetWindow(AshWindowTreeHost* ash_host) {
 140   CHECK(ash_host->AsWindowTreeHost());
 141   return ash_host->AsWindowTreeHost()->window();
 142 }
 143
 144 }  // namespace
 145
 146 // A utility class to store/restore focused/active window
 147 // when the display configuration has changed.
 148 class FocusActivationStore {
 149  public:
 150   FocusActivationStore()
 151       : activation_client_(NULL),
 152         capture_client_(NULL),
 153         focus_client_(NULL),
 154         focused_(NULL),
 155         active_(NULL) {
 156   }
 157
 158   void Store(bool clear_focus) {
 159     if (!activation_client_) {
 160       aura::Window* root = Shell::GetPrimaryRootWindow();
 161       activation_client_ = aura::client::GetActivationClient(root);
 162       capture_client_ = aura::client::GetCaptureClient(root);
 163       focus_client_ = aura::client::GetFocusClient(root);
 164     }
 165     focused_ = focus_client_->GetFocusedWindow();
 166     if (focused_)
 167       tracker_.Add(focused_);
 168     active_ = activation_client_->GetActiveWindow();
 169     if (active_ && focused_ != active_)
 170       tracker_.Add(active_);
 171
 172     // Deactivate the window to close menu / bubble windows.
 173     if (clear_focus)
 174       activation_client_->DeactivateWindow(active_);
 175
 176     // Release capture if any.
 177     capture_client_->SetCapture(NULL);
 178     // Clear the focused window if any. This is necessary because a
 179     // window may be deleted when losing focus (fullscreen flash for
 180     // example).  If the focused window is still alive after move, it'll
 181     // be re-focused below.
 182     if (clear_focus)
 183       focus_client_->FocusWindow(NULL);
 184   }
 185
 186   void Restore() {
 187     // Restore focused or active window if it's still alive.
 188     if (focused_ && tracker_.Contains(focused_)) {
 189       focus_client_->FocusWindow(focused_);
 190     } else if (active_ && tracker_.Contains(active_)) {
 191       activation_client_->ActivateWindow(active_);
 192     }
 193     if (focused_)
 194       tracker_.Remove(focused_);
 195     if (active_)
 196       tracker_.Remove(active_);
 197     focused_ = NULL;
 198     active_ = NULL;
 199   }
 200
 201  private:
 202   aura::client::ActivationClient* activation_client_;
 203   aura::client::CaptureClient* capture_client_;
 204   aura::client::FocusClient* focus_client_;
 205   aura::WindowTracker tracker_;
 206   aura::Window* focused_;
 207   aura::Window* active_;
 208
 209   DISALLOW_COPY_AND_ASSIGN(FocusActivationStore);
 210 };
 211
 212 ////////////////////////////////////////////////////////////////////////////////
 213 // DisplayChangeLimiter
 214
 215 DisplayController::DisplayChangeLimiter::DisplayChangeLimiter()
 216     : throttle_timeout_(base::Time::Now()) {
 217 }
 218
 219 void DisplayController::DisplayChangeLimiter::SetThrottleTimeout(
 220     int64 throttle_ms) {
 221   throttle_timeout_ =
 222       base::Time::Now() + base::TimeDelta::FromMilliseconds(throttle_ms);
 223 }
 224
 225 bool DisplayController::DisplayChangeLimiter::IsThrottled() const {
 226   return base::Time::Now() < throttle_timeout_;
 227 }
 228
 229 ////////////////////////////////////////////////////////////////////////////////
 230 // DisplayController
 231
 232 DisplayController::DisplayController()
 233     : primary_tree_host_for_replace_(NULL),
 234       focus_activation_store_(new FocusActivationStore()),
 235       cursor_window_controller_(new CursorWindowController()),
 236       mirror_window_controller_(new MirrorWindowController()),
 237       weak_ptr_factory_(this) {
 238 #if defined(OS_CHROMEOS)
 239   if (base::SysInfo::IsRunningOnChromeOS())
 240     limiter_.reset(new DisplayChangeLimiter);
 241 #endif
 242   // Reset primary display to make sure that tests don't use
 243   // stale display info from previous tests.
 244   primary_display_id = gfx::Display::kInvalidDisplayID;
 245 }
 246
 247 DisplayController::~DisplayController() {
 248 }
 249
 250 void DisplayController::Start() {
 251   Shell::GetScreen()->AddObserver(this);
 252   Shell::GetInstance()->display_manager()->set_delegate(this);
 253 }
 254
 255 void DisplayController::Shutdown() {
 256   // Unset the display manager's delegate here because
 257   // DisplayManager outlives DisplayController.
 258   Shell::GetInstance()->display_manager()->set_delegate(NULL);
 259
 260   cursor_window_controller_.reset();
 261   mirror_window_controller_.reset();
 262
 263   Shell::GetScreen()->RemoveObserver(this);
 264
 265   int64 primary_id = Shell::GetScreen()->GetPrimaryDisplay().id();
 266
 267   // Delete non primary root window controllers first, then
 268   // delete the primary root window controller.
 269   aura::Window::Windows root_windows = DisplayController::GetAllRootWindows();
 270   std::vector<RootWindowController*> to_delete;
 271   RootWindowController* primary_rwc = NULL;
 272   for (aura::Window::Windows::iterator iter = root_windows.begin();
 273        iter != root_windows.end();
 274        ++iter) {
 275     RootWindowController* rwc = GetRootWindowController(*iter);
 276     if (GetRootWindowSettings(*iter)->display_id == primary_id)
 277       primary_rwc = rwc;
 278     else
 279       to_delete.push_back(rwc);
 280   }
 281   CHECK(primary_rwc);
 282
 283   STLDeleteElements(&to_delete);
 284   delete primary_rwc;
 285 }
 286
 287 void DisplayController::CreatePrimaryHost(
 288     const AshWindowTreeHostInitParams& init_params) {
 289   const gfx::Display& primary_candidate =
 290       GetDisplayManager()->GetPrimaryDisplayCandidate();
 291   primary_display_id = primary_candidate.id();
 292   CHECK_NE(gfx::Display::kInvalidDisplayID, primary_display_id);
 293   AddWindowTreeHostForDisplay(primary_candidate, init_params);
 294 }
 295
 296 void DisplayController::InitDisplays() {
 297   RootWindowController::CreateForPrimaryDisplay(
 298       window_tree_hosts_[primary_display_id]);
 299
 300   DisplayManager* display_manager = GetDisplayManager();
 301   for (size_t i = 0; i < display_manager->GetNumDisplays(); ++i) {
 302     const gfx::Display& display = display_manager->GetDisplayAt(i);
 303     if (primary_display_id != display.id()) {
 304       AshWindowTreeHost* ash_host = AddWindowTreeHostForDisplay(
 305           display, AshWindowTreeHostInitParams());
 306       RootWindowController::CreateForSecondaryDisplay(ash_host);
 307     }
 308   }
 309   UpdateHostWindowNames();
 310
 311   FOR_EACH_OBSERVER(Observer, observers_, OnDisplaysInitialized());
 312 }
 313
 314 void DisplayController::AddObserver(Observer* observer) {
 315   observers_.AddObserver(observer);
 316 }
 317
 318 void DisplayController::RemoveObserver(Observer* observer) {
 319   observers_.RemoveObserver(observer);
 320 }
 321
 322 // static
 323 int64 DisplayController::GetPrimaryDisplayId() {
 324   CHECK_NE(gfx::Display::kInvalidDisplayID, primary_display_id);
 325   return primary_display_id;
 326 }
 327
 328 aura::Window* DisplayController::GetPrimaryRootWindow() {
 329   return GetRootWindowForDisplayId(primary_display_id);
 330 }
 331
 332 aura::Window* DisplayController::GetRootWindowForDisplayId(int64 id) {
 333   CHECK_EQ(1u, window_tree_hosts_.count(id));
 334   AshWindowTreeHost* host = window_tree_hosts_[id];
 335   CHECK(host);
 336   return GetWindow(host);
 337 }
 338
 339 void DisplayController::CloseChildWindows() {
 340   for (WindowTreeHostMap::const_iterator it = window_tree_hosts_.begin();
 341        it != window_tree_hosts_.end();
 342        ++it) {
 343     aura::Window* root_window = GetWindow(it->second);
 344     RootWindowController* controller = GetRootWindowController(root_window);
 345     if (controller) {
 346       controller->CloseChildWindows();
 347     } else {
 348       while (!root_window->children().empty()) {
 349         aura::Window* child = root_window->children()[0];
 350         delete child;
 351       }
 352     }
 353   }
 354 }
 355
 356 aura::Window::Windows DisplayController::GetAllRootWindows() {
 357   aura::Window::Windows windows;
 358   for (WindowTreeHostMap::const_iterator it = window_tree_hosts_.begin();
 359        it != window_tree_hosts_.end();
 360        ++it) {
 361     DCHECK(it->second);
 362     if (GetRootWindowController(GetWindow(it->second)))
 363       windows.push_back(GetWindow(it->second));
 364   }
 365   return windows;
 366 }
 367
 368 gfx::Insets DisplayController::GetOverscanInsets(int64 display_id) const {
 369   return GetDisplayManager()->GetOverscanInsets(display_id);
 370 }
 371
 372 void DisplayController::SetOverscanInsets(int64 display_id,
 373                                           const gfx::Insets& insets_in_dip) {
 374   GetDisplayManager()->SetOverscanInsets(display_id, insets_in_dip);
 375 }
 376
 377 std::vector<RootWindowController*>
 378 DisplayController::GetAllRootWindowControllers() {
 379   std::vector<RootWindowController*> controllers;
 380   for (WindowTreeHostMap::const_iterator it = window_tree_hosts_.begin();
 381        it != window_tree_hosts_.end();
 382        ++it) {
 383     RootWindowController* controller =
 384         GetRootWindowController(GetWindow(it->second));
 385     if (controller)
 386       controllers.push_back(controller);
 387   }
 388   return controllers;
 389 }
 390
 391 void DisplayController::ToggleMirrorMode() {
 392   DisplayManager* display_manager = GetDisplayManager();
 393   if (display_manager->num_connected_displays() <= 1)
 394     return;
 395
 396   if (limiter_) {
 397     if  (limiter_->IsThrottled())
 398       return;
 399     limiter_->SetThrottleTimeout(kCycleDisplayThrottleTimeoutMs);
 400   }
 401 #if defined(OS_CHROMEOS)
 402   Shell* shell = Shell::GetInstance();
 403   DisplayConfiguratorAnimation* animation =
 404       shell->display_configurator_animation();
 405   animation->StartFadeOutAnimation(
 406       base::Bind(&DisplayController::SetMirrorModeAfterAnimation,
 407                  weak_ptr_factory_.GetWeakPtr(),
 408                  !display_manager->IsMirrored()));
 409 #endif
 410 }
 411
 412 void DisplayController::SwapPrimaryDisplay() {
 413   if (limiter_) {
 414     if  (limiter_->IsThrottled())
 415       return;
 416     limiter_->SetThrottleTimeout(kSwapDisplayThrottleTimeoutMs);
 417   }
 418
 419   if (Shell::GetScreen()->GetNumDisplays() > 1) {
 420 #if defined(OS_CHROMEOS)
 421     DisplayConfiguratorAnimation* animation =
 422         Shell::GetInstance()->display_configurator_animation();
 423     if (animation) {
 424       animation->StartFadeOutAnimation(base::Bind(
 425           &DisplayController::OnFadeOutForSwapDisplayFinished,
 426           weak_ptr_factory_.GetWeakPtr()));
 427     } else {
 428       SetPrimaryDisplay(ScreenUtil::GetSecondaryDisplay());
 429     }
 430 #else
 431     SetPrimaryDisplay(ScreenUtil::GetSecondaryDisplay());
 432 #endif
 433   }
 434 }
 435
 436 void DisplayController::SetPrimaryDisplayId(int64 id) {
 437   DCHECK_NE(gfx::Display::kInvalidDisplayID, id);
 438   if (id == gfx::Display::kInvalidDisplayID || primary_display_id == id)
 439     return;
 440
 441   const gfx::Display& display = GetDisplayManager()->GetDisplayForId(id);
 442   if (display.is_valid())
 443     SetPrimaryDisplay(display);
 444 }
 445
 446 void DisplayController::SetPrimaryDisplay(
 447     const gfx::Display& new_primary_display) {
 448   DisplayManager* display_manager = GetDisplayManager();
 449   DCHECK(new_primary_display.is_valid());
 450   DCHECK(display_manager->IsActiveDisplay(new_primary_display));
 451
 452   if (!new_primary_display.is_valid() ||
 453       !display_manager->IsActiveDisplay(new_primary_display)) {
 454     LOG(ERROR) << "Invalid or non-existent display is requested:"
 455                << new_primary_display.ToString();
 456     return;
 457   }
 458
 459   if (primary_display_id == new_primary_display.id() ||
 460       window_tree_hosts_.size() < 2) {
 461     return;
 462   }
 463
 464   AshWindowTreeHost* non_primary_host =
 465       window_tree_hosts_[new_primary_display.id()];
 466   LOG_IF(ERROR, !non_primary_host)
 467       << "Unknown display is requested in SetPrimaryDisplay: id="
 468       << new_primary_display.id();
 469   if (!non_primary_host)
 470     return;
 471
 472   gfx::Display old_primary_display = Shell::GetScreen()->GetPrimaryDisplay();
 473
 474   // Swap root windows between current and new primary display.
 475   AshWindowTreeHost* primary_host = window_tree_hosts_[primary_display_id];
 476   CHECK(primary_host);
 477   CHECK_NE(primary_host, non_primary_host);
 478
 479   window_tree_hosts_[new_primary_display.id()] = primary_host;
 480   GetRootWindowSettings(GetWindow(primary_host))->display_id =
 481       new_primary_display.id();
 482
 483   window_tree_hosts_[old_primary_display.id()] = non_primary_host;
 484   GetRootWindowSettings(GetWindow(non_primary_host))->display_id =
 485       old_primary_display.id();
 486
 487   primary_display_id = new_primary_display.id();
 488   GetDisplayManager()->layout_store()->UpdatePrimaryDisplayId(
 489       display_manager->GetCurrentDisplayIdPair(), primary_display_id);
 490
 491   UpdateWorkAreaOfDisplayNearestWindow(GetWindow(primary_host),
 492                                        old_primary_display.GetWorkAreaInsets());
 493   UpdateWorkAreaOfDisplayNearestWindow(GetWindow(non_primary_host),
 494                                        new_primary_display.GetWorkAreaInsets());
 495
 496   // Update the dispay manager with new display info.
 497   std::vector<DisplayInfo> display_info_list;
 498   display_info_list.push_back(display_manager->GetDisplayInfo(
 499       primary_display_id));
 500   display_info_list.push_back(display_manager->GetDisplayInfo(
 501       ScreenUtil::GetSecondaryDisplay().id()));
 502   GetDisplayManager()->set_force_bounds_changed(true);
 503   GetDisplayManager()->UpdateDisplays(display_info_list);
 504   GetDisplayManager()->set_force_bounds_changed(false);
 505 }
 506
 507 void DisplayController::EnsurePointerInDisplays() {
 508   // If the mouse is currently on a display in native location,
 509   // use the same native location. Otherwise find the display closest
 510   // to the current cursor location in screen coordinates.
 511
 512   gfx::Point point_in_screen = Shell::GetScreen()->GetCursorScreenPoint();
 513   gfx::Point target_location_in_native;
 514   int64 closest_distance_squared = -1;
 515   DisplayManager* display_manager = GetDisplayManager();
 516
 517   aura::Window* dst_root_window = NULL;
 518   for (size_t i = 0; i < display_manager->GetNumDisplays(); ++i) {
 519     const gfx::Display& display = display_manager->GetDisplayAt(i);
 520     const DisplayInfo display_info =
 521         display_manager->GetDisplayInfo(display.id());
 522     aura::Window* root_window = GetRootWindowForDisplayId(display.id());
 523     if (display_info.bounds_in_native().Contains(
 524             cursor_location_in_native_coords_for_restore_)) {
 525       dst_root_window = root_window;
 526       target_location_in_native = cursor_location_in_native_coords_for_restore_;
 527       break;
 528     }
 529     gfx::Point center = display.bounds().CenterPoint();
 530     // Use the distance squared from the center of the dislay. This is not
 531     // exactly "closest" display, but good enough to pick one
 532     // appropriate (and there are at most two displays).
 533     // We don't care about actual distance, only relative to other displays, so
 534     // using the LengthSquared() is cheaper than Length().
 535
 536     int64 distance_squared = (center - point_in_screen).LengthSquared();
 537     if (closest_distance_squared < 0 ||
 538         closest_distance_squared > distance_squared) {
 539       aura::Window* root_window = GetRootWindowForDisplayId(display.id());
 540       aura::client::ScreenPositionClient* client =
 541           aura::client::GetScreenPositionClient(root_window);
 542       client->ConvertPointFromScreen(root_window, &center);
 543       root_window->GetHost()->ConvertPointToNativeScreen(&center);
 544       dst_root_window = root_window;
 545       target_location_in_native = center;
 546       closest_distance_squared = distance_squared;
 547     }
 548   }
 549   dst_root_window->GetHost()->ConvertPointFromNativeScreen(
 550       &target_location_in_native);
 551   dst_root_window->MoveCursorTo(target_location_in_native);
 552 }
 553
 554 bool DisplayController::UpdateWorkAreaOfDisplayNearestWindow(
 555     const aura::Window* window,
 556     const gfx::Insets& insets) {
 557   const aura::Window* root_window = window->GetRootWindow();
 558   int64 id = GetRootWindowSettings(root_window)->display_id;
 559   // if id is |kInvaildDisplayID|, it's being deleted.
 560   DCHECK(id != gfx::Display::kInvalidDisplayID);
 561   return GetDisplayManager()->UpdateWorkAreaOfDisplay(id, insets);
 562 }
 563
 564 void DisplayController::OnDisplayAdded(const gfx::Display& display) {
 565   if (primary_tree_host_for_replace_) {
 566     DCHECK(window_tree_hosts_.empty());
 567     primary_display_id = display.id();
 568     window_tree_hosts_[display.id()] = primary_tree_host_for_replace_;
 569     GetRootWindowSettings(GetWindow(primary_tree_host_for_replace_))
 570         ->display_id = display.id();
 571     primary_tree_host_for_replace_ = NULL;
 572     const DisplayInfo& display_info =
 573         GetDisplayManager()->GetDisplayInfo(display.id());
 574     AshWindowTreeHost* ash_host = window_tree_hosts_[display.id()];
 575     ash_host->AsWindowTreeHost()->SetBounds(display_info.bounds_in_native());
 576     SetDisplayPropertiesOnHost(ash_host, display);
 577   } else {
 578     if (primary_display_id == gfx::Display::kInvalidDisplayID)
 579       primary_display_id = display.id();
 580     DCHECK(!window_tree_hosts_.empty());
 581     AshWindowTreeHost* ash_host = AddWindowTreeHostForDisplay(
 582         display, AshWindowTreeHostInitParams());
 583     RootWindowController::CreateForSecondaryDisplay(ash_host);
 584   }
 585 }
 586
 587 void DisplayController::OnDisplayRemoved(const gfx::Display& display) {
 588   AshWindowTreeHost* host_to_delete = window_tree_hosts_[display.id()];
 589   CHECK(host_to_delete) << display.ToString();
 590
 591   // Display for root window will be deleted when the Primary RootWindow
 592   // is deleted by the Shell.
 593   window_tree_hosts_.erase(display.id());
 594
 595   // When the primary root window's display is removed, move the primary
 596   // root to the other display.
 597   if (primary_display_id == display.id()) {
 598     // Temporarily store the primary root window in
 599     // |primary_root_window_for_replace_| when replacing the display.
 600     if (window_tree_hosts_.size() == 0) {
 601       primary_display_id = gfx::Display::kInvalidDisplayID;
 602       primary_tree_host_for_replace_ = host_to_delete;
 603       return;
 604     }
 605     DCHECK_EQ(1U, window_tree_hosts_.size());
 606     primary_display_id = ScreenUtil::GetSecondaryDisplay().id();
 607     AshWindowTreeHost* primary_host = host_to_delete;
 608
 609     // Delete the other host instead.
 610     host_to_delete = window_tree_hosts_[primary_display_id];
 611     GetRootWindowSettings(GetWindow(host_to_delete))->display_id = display.id();
 612
 613     // Setup primary root.
 614     window_tree_hosts_[primary_display_id] = primary_host;
 615     GetRootWindowSettings(GetWindow(primary_host))->display_id =
 616         primary_display_id;
 617
 618     OnDisplayMetricsChanged(
 619         GetDisplayManager()->GetDisplayForId(primary_display_id),
 620         DISPLAY_METRIC_BOUNDS);
 621   }
 622   RootWindowController* controller =
 623       GetRootWindowController(GetWindow(host_to_delete));
 624   DCHECK(controller);
 625   controller->MoveWindowsTo(GetPrimaryRootWindow());
 626   // Delete most of root window related objects, but don't delete
 627   // root window itself yet because the stack may be using it.
 628   controller->Shutdown();
 629   base::MessageLoop::current()->DeleteSoon(FROM_HERE, controller);
 630 }
 631
 632 void DisplayController::OnDisplayMetricsChanged(const gfx::Display& display,
 633                                                 uint32_t metrics) {
 634   if (!(metrics & (DISPLAY_METRIC_BOUNDS | DISPLAY_METRIC_ROTATION |
 635                    DISPLAY_METRIC_DEVICE_SCALE_FACTOR)))
 636     return;
 637   const DisplayInfo& display_info =
 638       GetDisplayManager()->GetDisplayInfo(display.id());
 639   DCHECK(!display_info.bounds_in_native().IsEmpty());
 640   AshWindowTreeHost* ash_host = window_tree_hosts_[display.id()];
 641   ash_host->AsWindowTreeHost()->SetBounds(display_info.bounds_in_native());
 642   SetDisplayPropertiesOnHost(ash_host, display);
 643 }
 644
 645 void DisplayController::OnHostResized(const aura::WindowTreeHost* host) {
 646   gfx::Display display = Shell::GetScreen()->GetDisplayNearestWindow(
 647       const_cast<aura::Window*>(host->window()));
 648
 649   DisplayManager* display_manager = GetDisplayManager();
 650   if (display_manager->UpdateDisplayBounds(display.id(), host->GetBounds())) {
 651     mirror_window_controller_->UpdateWindow();
 652     cursor_window_controller_->UpdateContainer();
 653   }
 654 }
 655
 656 void DisplayController::CreateOrUpdateNonDesktopDisplay(
 657     const DisplayInfo& info) {
 658   switch (GetDisplayManager()->second_display_mode()) {
 659     case DisplayManager::MIRRORING:
 660       mirror_window_controller_->UpdateWindow(info);
 661       cursor_window_controller_->UpdateContainer();
 662       break;
 663     case DisplayManager::EXTENDED:
 664       NOTREACHED();
 665   }
 666 }
 667
 668 void DisplayController::CloseNonDesktopDisplay() {
 669   mirror_window_controller_->Close();
 670   // If cursor_compositing is enabled for large cursor, the cursor window is
 671   // always on the desktop display (the visible cursor on the non-desktop
 672   // display is drawn through compositor mirroring). Therefore, it's unnecessary
 673   // to handle the cursor_window at all. See: http://crbug.com/412910
 674   if (!cursor_window_controller_->is_cursor_compositing_enabled())
 675     cursor_window_controller_->UpdateContainer();
 676 }
 677
 678 void DisplayController::PreDisplayConfigurationChange(bool clear_focus) {
 679   FOR_EACH_OBSERVER(Observer, observers_, OnDisplayConfigurationChanging());
 680   focus_activation_store_->Store(clear_focus);
 681   gfx::Screen* screen = Shell::GetScreen();
 682   gfx::Point point_in_screen = screen->GetCursorScreenPoint();
 683   gfx::Display display = screen->GetDisplayNearestPoint(point_in_screen);
 684   aura::Window* root_window = GetRootWindowForDisplayId(display.id());
 685
 686   aura::client::ScreenPositionClient* client =
 687       aura::client::GetScreenPositionClient(root_window);
 688   client->ConvertPointFromScreen(root_window, &point_in_screen);
 689   root_window->GetHost()->ConvertPointToNativeScreen(&point_in_screen);
 690   cursor_location_in_native_coords_for_restore_ = point_in_screen;
 691 }
 692
 693 void DisplayController::PostDisplayConfigurationChange() {
 694   if (limiter_)
 695     limiter_->SetThrottleTimeout(kAfterDisplayChangeThrottleTimeoutMs);
 696
 697   focus_activation_store_->Restore();
 698
 699   DisplayManager* display_manager = GetDisplayManager();
 700   DisplayLayoutStore* layout_store = display_manager->layout_store();
 701   if (display_manager->num_connected_displays() > 1) {
 702     DisplayIdPair pair = display_manager->GetCurrentDisplayIdPair();
 703     layout_store->UpdateMirrorStatus(pair, display_manager->IsMirrored());
 704     DisplayLayout layout = layout_store->GetRegisteredDisplayLayout(pair);
 705
 706     if (Shell::GetScreen()->GetNumDisplays() > 1 ) {
 707       int64 primary_id = layout.primary_id;
 708       SetPrimaryDisplayId(
 709           primary_id == gfx::Display::kInvalidDisplayID ?
 710           pair.first : primary_id);
 711       // Update the primary_id in case the above call is
 712       // ignored. Happens when a) default layout's primary id
 713       // doesn't exist, or b) the primary_id has already been
 714       // set to the same and didn't update it.
 715       layout_store->UpdatePrimaryDisplayId(
 716           pair, Shell::GetScreen()->GetPrimaryDisplay().id());
 717     }
 718   }
 719   FOR_EACH_OBSERVER(Observer, observers_, OnDisplayConfigurationChanged());
 720   UpdateHostWindowNames();
 721   EnsurePointerInDisplays();
 722 }
 723
 724 AshWindowTreeHost* DisplayController::AddWindowTreeHostForDisplay(
 725     const gfx::Display& display,
 726     const AshWindowTreeHostInitParams& init_params) {
 727   static int host_count = 0;
 728   const DisplayInfo& display_info =
 729       GetDisplayManager()->GetDisplayInfo(display.id());
 730   AshWindowTreeHostInitParams params_with_bounds(init_params);
 731   params_with_bounds.initial_bounds = display_info.bounds_in_native();
 732   AshWindowTreeHost* ash_host = AshWindowTreeHost::Create(params_with_bounds);
 733   aura::WindowTreeHost* host = ash_host->AsWindowTreeHost();
 734
 735   host->window()->SetName(base::StringPrintf("RootWindow-%d", host_count++));
 736   host->window()->SetTitle(base::UTF8ToUTF16(display_info.name()));
 737   host->compositor()->SetBackgroundColor(SK_ColorBLACK);
 738   // No need to remove our observer observer because the DisplayController
 739   // outlives the host.
 740   host->AddObserver(this);
 741   InitRootWindowSettings(host->window())->display_id = display.id();
 742   host->InitHost();
 743
 744   window_tree_hosts_[display.id()] = ash_host;
 745   SetDisplayPropertiesOnHost(ash_host, display);
 746
 747 #if defined(OS_CHROMEOS)
 748   static bool force_constrain_pointer_to_root =
 749       CommandLine::ForCurrentProcess()->HasSwitch(
 750           switches::kAshConstrainPointerToRoot);
 751   if (base::SysInfo::IsRunningOnChromeOS() || force_constrain_pointer_to_root)
 752     ash_host->ConfineCursorToRootWindow();
 753 #endif
 754   return ash_host;
 755 }
 756
 757 void DisplayController::OnFadeOutForSwapDisplayFinished() {
 758 #if defined(OS_CHROMEOS)
 759   SetPrimaryDisplay(ScreenUtil::GetSecondaryDisplay());
 760   Shell::GetInstance()->display_configurator_animation()
 761       ->StartFadeInAnimation();
 762 #endif
 763 }
 764
 765 void DisplayController::SetMirrorModeAfterAnimation(bool mirror) {
 766   GetDisplayManager()->SetMirrorMode(mirror);
 767 }
 768
 769 void DisplayController::UpdateHostWindowNames() {
 770 #if defined(USE_X11)
 771   // crbug.com/120229 - set the window title for the primary dislpay
 772   // to "aura_root_0" so gtalk can find the primary root window to broadcast.
 773   // TODO(jhorwich) Remove this once Chrome supports window-based broadcasting.
 774   aura::Window* primary = Shell::GetPrimaryRootWindow();
 775   aura::Window::Windows root_windows = Shell::GetAllRootWindows();
 776   for (size_t i = 0; i < root_windows.size(); ++i) {
 777     std::string name =
 778         root_windows[i] == primary ? "aura_root_0" : "aura_root_x";
 779     gfx::AcceleratedWidget xwindow =
 780         root_windows[i]->GetHost()->GetAcceleratedWidget();
 781     XStoreName(gfx::GetXDisplay(), xwindow, name.c_str());
 782   }
 783 #endif
 784 }
 785
 786 }  // namespace ash