display_controller.cc revision f8ee788a64d60abd8f2d742a5fdedde054ecd910 
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/display/virtual_keyboard_window_controller.h"
18#include "ash/host/ash_window_tree_host.h"
19#include "ash/host/ash_window_tree_host_init_params.h"
20#include "ash/host/root_window_transformer.h"
21#include "ash/root_window_controller.h"
22#include "ash/root_window_settings.h"
23#include "ash/screen_util.h"
24#include "ash/shell.h"
25#include "ash/shell_delegate.h"
26#include "ash/wm/coordinate_conversion.h"
27#include "base/command_line.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
61namespace ash {
62namespace {
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().
69int64 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.
77const int64 kAfterDisplayChangeThrottleTimeoutMs = 500;
78const int64 kCycleDisplayThrottleTimeoutMs = 4000;
79const int64 kSwapDisplayThrottleTimeoutMs = 500;
80
81DisplayManager* GetDisplayManager() {
82  return Shell::GetInstance()->display_manager();
83}
84
85void 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  if (GetDisplayManager()->GetSelectedModeForDisplayId(display.id(), &mode) &&
132      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
139aura::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.
148class 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
215DisplayController::DisplayChangeLimiter::DisplayChangeLimiter()
216    : throttle_timeout_(base::Time::Now()) {
217}
218
219void DisplayController::DisplayChangeLimiter::SetThrottleTimeout(
220    int64 throttle_ms) {
221  throttle_timeout_ =
222      base::Time::Now() + base::TimeDelta::FromMilliseconds(throttle_ms);
223}
224
225bool DisplayController::DisplayChangeLimiter::IsThrottled() const {
226  return base::Time::Now() < throttle_timeout_;
227}
228
229////////////////////////////////////////////////////////////////////////////////
230// DisplayController
231
232DisplayController::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
247DisplayController::~DisplayController() {
248}
249
250void DisplayController::Start() {
251  // Created here so that Shell has finished being created. Adds itself
252  // as a ShellObserver.
253  virtual_keyboard_window_controller_.reset(
254      new VirtualKeyboardWindowController);
255  Shell::GetScreen()->AddObserver(this);
256  Shell::GetInstance()->display_manager()->set_delegate(this);
257}
258
259void DisplayController::Shutdown() {
260  // Unset the display manager's delegate here because
261  // DisplayManager outlives DisplayController.
262  Shell::GetInstance()->display_manager()->set_delegate(NULL);
263
264  cursor_window_controller_.reset();
265  mirror_window_controller_.reset();
266  virtual_keyboard_window_controller_.reset();
267
268  Shell::GetScreen()->RemoveObserver(this);
269  // Delete all root window controllers, which deletes root window
270  // from the last so that the primary root window gets deleted last.
271  for (WindowTreeHostMap::const_reverse_iterator it =
272           window_tree_hosts_.rbegin();
273       it != window_tree_hosts_.rend();
274       ++it) {
275    RootWindowController* controller =
276        GetRootWindowController(GetWindow(it->second));
277    DCHECK(controller);
278    delete controller;
279  }
280}
281
282void DisplayController::CreatePrimaryHost(
283    const AshWindowTreeHostInitParams& init_params) {
284  const gfx::Display& primary_candidate =
285      GetDisplayManager()->GetPrimaryDisplayCandidate();
286  primary_display_id = primary_candidate.id();
287  CHECK_NE(gfx::Display::kInvalidDisplayID, primary_display_id);
288  AddWindowTreeHostForDisplay(primary_candidate, init_params);
289}
290
291void DisplayController::InitDisplays() {
292  RootWindowController::CreateForPrimaryDisplay(
293      window_tree_hosts_[primary_display_id]);
294
295  DisplayManager* display_manager = GetDisplayManager();
296  for (size_t i = 0; i < display_manager->GetNumDisplays(); ++i) {
297    const gfx::Display& display = display_manager->GetDisplayAt(i);
298    if (primary_display_id != display.id()) {
299      AshWindowTreeHost* ash_host = AddWindowTreeHostForDisplay(
300          display, AshWindowTreeHostInitParams());
301      RootWindowController::CreateForSecondaryDisplay(ash_host);
302    }
303  }
304  UpdateHostWindowNames();
305
306  FOR_EACH_OBSERVER(Observer, observers_, OnDisplaysInitialized());
307}
308
309void DisplayController::AddObserver(Observer* observer) {
310  observers_.AddObserver(observer);
311}
312
313void DisplayController::RemoveObserver(Observer* observer) {
314  observers_.RemoveObserver(observer);
315}
316
317// static
318int64 DisplayController::GetPrimaryDisplayId() {
319  CHECK_NE(gfx::Display::kInvalidDisplayID, primary_display_id);
320  return primary_display_id;
321}
322
323aura::Window* DisplayController::GetPrimaryRootWindow() {
324  return GetRootWindowForDisplayId(primary_display_id);
325}
326
327aura::Window* DisplayController::GetRootWindowForDisplayId(int64 id) {
328  DCHECK_EQ(1u, window_tree_hosts_.count(id));
329  AshWindowTreeHost* host = window_tree_hosts_[id];
330  CHECK(host);
331  return GetWindow(host);
332}
333
334void DisplayController::CloseChildWindows() {
335  for (WindowTreeHostMap::const_iterator it = window_tree_hosts_.begin();
336       it != window_tree_hosts_.end();
337       ++it) {
338    aura::Window* root_window = GetWindow(it->second);
339    RootWindowController* controller = GetRootWindowController(root_window);
340    if (controller) {
341      controller->CloseChildWindows();
342    } else {
343      while (!root_window->children().empty()) {
344        aura::Window* child = root_window->children()[0];
345        delete child;
346      }
347    }
348  }
349}
350
351aura::Window::Windows DisplayController::GetAllRootWindows() {
352  aura::Window::Windows windows;
353  for (WindowTreeHostMap::const_iterator it = window_tree_hosts_.begin();
354       it != window_tree_hosts_.end();
355       ++it) {
356    DCHECK(it->second);
357    if (GetRootWindowController(GetWindow(it->second)))
358      windows.push_back(GetWindow(it->second));
359  }
360  return windows;
361}
362
363gfx::Insets DisplayController::GetOverscanInsets(int64 display_id) const {
364  return GetDisplayManager()->GetOverscanInsets(display_id);
365}
366
367void DisplayController::SetOverscanInsets(int64 display_id,
368                                          const gfx::Insets& insets_in_dip) {
369  GetDisplayManager()->SetOverscanInsets(display_id, insets_in_dip);
370}
371
372std::vector<RootWindowController*>
373DisplayController::GetAllRootWindowControllers() {
374  std::vector<RootWindowController*> controllers;
375  for (WindowTreeHostMap::const_iterator it = window_tree_hosts_.begin();
376       it != window_tree_hosts_.end();
377       ++it) {
378    RootWindowController* controller =
379        GetRootWindowController(GetWindow(it->second));
380    if (controller)
381      controllers.push_back(controller);
382  }
383  return controllers;
384}
385
386void DisplayController::ToggleMirrorMode() {
387  DisplayManager* display_manager = GetDisplayManager();
388  if (display_manager->num_connected_displays() <= 1)
389    return;
390
391  if (limiter_) {
392    if  (limiter_->IsThrottled())
393      return;
394    limiter_->SetThrottleTimeout(kCycleDisplayThrottleTimeoutMs);
395  }
396#if defined(OS_CHROMEOS)
397  Shell* shell = Shell::GetInstance();
398  DisplayConfiguratorAnimation* animation =
399      shell->display_configurator_animation();
400  animation->StartFadeOutAnimation(
401      base::Bind(&DisplayController::SetMirrorModeAfterAnimation,
402                 weak_ptr_factory_.GetWeakPtr(),
403                 !display_manager->IsMirrored()));
404#endif
405}
406
407void DisplayController::SwapPrimaryDisplay() {
408  if (limiter_) {
409    if  (limiter_->IsThrottled())
410      return;
411    limiter_->SetThrottleTimeout(kSwapDisplayThrottleTimeoutMs);
412  }
413
414  if (Shell::GetScreen()->GetNumDisplays() > 1) {
415#if defined(OS_CHROMEOS)
416    DisplayConfiguratorAnimation* animation =
417        Shell::GetInstance()->display_configurator_animation();
418    if (animation) {
419      animation->StartFadeOutAnimation(base::Bind(
420          &DisplayController::OnFadeOutForSwapDisplayFinished,
421          weak_ptr_factory_.GetWeakPtr()));
422    } else {
423      SetPrimaryDisplay(ScreenUtil::GetSecondaryDisplay());
424    }
425#else
426    SetPrimaryDisplay(ScreenUtil::GetSecondaryDisplay());
427#endif
428  }
429}
430
431void DisplayController::SetPrimaryDisplayId(int64 id) {
432  DCHECK_NE(gfx::Display::kInvalidDisplayID, id);
433  if (id == gfx::Display::kInvalidDisplayID || primary_display_id == id)
434    return;
435
436  const gfx::Display& display = GetDisplayManager()->GetDisplayForId(id);
437  if (display.is_valid())
438    SetPrimaryDisplay(display);
439}
440
441void DisplayController::SetPrimaryDisplay(
442    const gfx::Display& new_primary_display) {
443  DisplayManager* display_manager = GetDisplayManager();
444  DCHECK(new_primary_display.is_valid());
445  DCHECK(display_manager->IsActiveDisplay(new_primary_display));
446
447  if (!new_primary_display.is_valid() ||
448      !display_manager->IsActiveDisplay(new_primary_display)) {
449    LOG(ERROR) << "Invalid or non-existent display is requested:"
450               << new_primary_display.ToString();
451    return;
452  }
453
454  if (primary_display_id == new_primary_display.id() ||
455      window_tree_hosts_.size() < 2) {
456    return;
457  }
458
459  AshWindowTreeHost* non_primary_host =
460      window_tree_hosts_[new_primary_display.id()];
461  LOG_IF(ERROR, !non_primary_host)
462      << "Unknown display is requested in SetPrimaryDisplay: id="
463      << new_primary_display.id();
464  if (!non_primary_host)
465    return;
466
467  gfx::Display old_primary_display = Shell::GetScreen()->GetPrimaryDisplay();
468
469  // Swap root windows between current and new primary display.
470  AshWindowTreeHost* primary_host = window_tree_hosts_[primary_display_id];
471  CHECK(primary_host);
472  CHECK_NE(primary_host, non_primary_host);
473
474  window_tree_hosts_[new_primary_display.id()] = primary_host;
475  GetRootWindowSettings(GetWindow(primary_host))->display_id =
476      new_primary_display.id();
477
478  window_tree_hosts_[old_primary_display.id()] = non_primary_host;
479  GetRootWindowSettings(GetWindow(non_primary_host))->display_id =
480      old_primary_display.id();
481
482  primary_display_id = new_primary_display.id();
483  GetDisplayManager()->layout_store()->UpdatePrimaryDisplayId(
484      display_manager->GetCurrentDisplayIdPair(), primary_display_id);
485
486  UpdateWorkAreaOfDisplayNearestWindow(GetWindow(primary_host),
487                                       old_primary_display.GetWorkAreaInsets());
488  UpdateWorkAreaOfDisplayNearestWindow(GetWindow(non_primary_host),
489                                       new_primary_display.GetWorkAreaInsets());
490
491  // Update the dispay manager with new display info.
492  std::vector<DisplayInfo> display_info_list;
493  display_info_list.push_back(display_manager->GetDisplayInfo(
494      primary_display_id));
495  display_info_list.push_back(display_manager->GetDisplayInfo(
496      ScreenUtil::GetSecondaryDisplay().id()));
497  GetDisplayManager()->set_force_bounds_changed(true);
498  GetDisplayManager()->UpdateDisplays(display_info_list);
499  GetDisplayManager()->set_force_bounds_changed(false);
500}
501
502void DisplayController::EnsurePointerInDisplays() {
503  // If the mouse is currently on a display in native location,
504  // use the same native location. Otherwise find the display closest
505  // to the current cursor location in screen coordinates.
506
507  gfx::Point point_in_screen = Shell::GetScreen()->GetCursorScreenPoint();
508  gfx::Point target_location_in_native;
509  int64 closest_distance_squared = -1;
510  DisplayManager* display_manager = GetDisplayManager();
511
512  aura::Window* dst_root_window = NULL;
513  for (size_t i = 0; i < display_manager->GetNumDisplays(); ++i) {
514    const gfx::Display& display = display_manager->GetDisplayAt(i);
515    const DisplayInfo display_info =
516        display_manager->GetDisplayInfo(display.id());
517    aura::Window* root_window = GetRootWindowForDisplayId(display.id());
518    if (display_info.bounds_in_native().Contains(
519            cursor_location_in_native_coords_for_restore_)) {
520      dst_root_window = root_window;
521      target_location_in_native = cursor_location_in_native_coords_for_restore_;
522      break;
523    }
524    gfx::Point center = display.bounds().CenterPoint();
525    // Use the distance squared from the center of the dislay. This is not
526    // exactly "closest" display, but good enough to pick one
527    // appropriate (and there are at most two displays).
528    // We don't care about actual distance, only relative to other displays, so
529    // using the LengthSquared() is cheaper than Length().
530
531    int64 distance_squared = (center - point_in_screen).LengthSquared();
532    if (closest_distance_squared < 0 ||
533        closest_distance_squared > distance_squared) {
534      aura::Window* root_window = GetRootWindowForDisplayId(display.id());
535      aura::client::ScreenPositionClient* client =
536          aura::client::GetScreenPositionClient(root_window);
537      client->ConvertPointFromScreen(root_window, &center);
538      root_window->GetHost()->ConvertPointToNativeScreen(&center);
539      dst_root_window = root_window;
540      target_location_in_native = center;
541      closest_distance_squared = distance_squared;
542    }
543  }
544  dst_root_window->GetHost()->ConvertPointFromNativeScreen(
545      &target_location_in_native);
546  dst_root_window->MoveCursorTo(target_location_in_native);
547}
548
549bool DisplayController::UpdateWorkAreaOfDisplayNearestWindow(
550    const aura::Window* window,
551    const gfx::Insets& insets) {
552  const aura::Window* root_window = window->GetRootWindow();
553  int64 id = GetRootWindowSettings(root_window)->display_id;
554  // if id is |kInvaildDisplayID|, it's being deleted.
555  DCHECK(id != gfx::Display::kInvalidDisplayID);
556  return GetDisplayManager()->UpdateWorkAreaOfDisplay(id, insets);
557}
558
559void DisplayController::OnDisplayAdded(const gfx::Display& display) {
560  if (primary_tree_host_for_replace_) {
561    DCHECK(window_tree_hosts_.empty());
562    primary_display_id = display.id();
563    window_tree_hosts_[display.id()] = primary_tree_host_for_replace_;
564    GetRootWindowSettings(GetWindow(primary_tree_host_for_replace_))
565        ->display_id = display.id();
566    primary_tree_host_for_replace_ = NULL;
567    const DisplayInfo& display_info =
568        GetDisplayManager()->GetDisplayInfo(display.id());
569    AshWindowTreeHost* ash_host = window_tree_hosts_[display.id()];
570    ash_host->AsWindowTreeHost()->SetBounds(display_info.bounds_in_native());
571    SetDisplayPropertiesOnHost(ash_host, display);
572  } else {
573    if (primary_display_id == gfx::Display::kInvalidDisplayID)
574      primary_display_id = display.id();
575    DCHECK(!window_tree_hosts_.empty());
576    AshWindowTreeHost* ash_host = AddWindowTreeHostForDisplay(
577        display, AshWindowTreeHostInitParams());
578    RootWindowController::CreateForSecondaryDisplay(ash_host);
579  }
580}
581
582void DisplayController::OnDisplayRemoved(const gfx::Display& display) {
583  AshWindowTreeHost* host_to_delete = window_tree_hosts_[display.id()];
584  CHECK(host_to_delete) << display.ToString();
585
586  // Display for root window will be deleted when the Primary RootWindow
587  // is deleted by the Shell.
588  window_tree_hosts_.erase(display.id());
589
590  // When the primary root window's display is removed, move the primary
591  // root to the other display.
592  if (primary_display_id == display.id()) {
593    // Temporarily store the primary root window in
594    // |primary_root_window_for_replace_| when replacing the display.
595    if (window_tree_hosts_.size() == 0) {
596      primary_display_id = gfx::Display::kInvalidDisplayID;
597      primary_tree_host_for_replace_ = host_to_delete;
598      return;
599    }
600    DCHECK_EQ(1U, window_tree_hosts_.size());
601    primary_display_id = ScreenUtil::GetSecondaryDisplay().id();
602    AshWindowTreeHost* primary_host = host_to_delete;
603
604    // Delete the other host instead.
605    host_to_delete = window_tree_hosts_[primary_display_id];
606    GetRootWindowSettings(GetWindow(host_to_delete))->display_id = display.id();
607
608    // Setup primary root.
609    window_tree_hosts_[primary_display_id] = primary_host;
610    GetRootWindowSettings(GetWindow(primary_host))->display_id =
611        primary_display_id;
612
613    OnDisplayMetricsChanged(
614        GetDisplayManager()->GetDisplayForId(primary_display_id),
615        DISPLAY_METRIC_BOUNDS);
616  }
617  RootWindowController* controller =
618      GetRootWindowController(GetWindow(host_to_delete));
619  DCHECK(controller);
620  controller->MoveWindowsTo(GetPrimaryRootWindow());
621  // Delete most of root window related objects, but don't delete
622  // root window itself yet because the stack may be using it.
623  controller->Shutdown();
624  base::MessageLoop::current()->DeleteSoon(FROM_HERE, controller);
625}
626
627void DisplayController::OnDisplayMetricsChanged(const gfx::Display& display,
628                                                uint32_t metrics) {
629  if (!(metrics & (DISPLAY_METRIC_BOUNDS | DISPLAY_METRIC_ROTATION |
630                   DISPLAY_METRIC_DEVICE_SCALE_FACTOR)))
631    return;
632
633  const DisplayInfo& display_info =
634      GetDisplayManager()->GetDisplayInfo(display.id());
635  DCHECK(!display_info.bounds_in_native().IsEmpty());
636  AshWindowTreeHost* ash_host = window_tree_hosts_[display.id()];
637  ash_host->AsWindowTreeHost()->SetBounds(display_info.bounds_in_native());
638  SetDisplayPropertiesOnHost(ash_host, display);
639}
640
641void DisplayController::OnHostResized(const aura::WindowTreeHost* host) {
642  gfx::Display display = Shell::GetScreen()->GetDisplayNearestWindow(
643      const_cast<aura::Window*>(host->window()));
644
645  DisplayManager* display_manager = GetDisplayManager();
646  if (display_manager->UpdateDisplayBounds(display.id(), host->GetBounds())) {
647    mirror_window_controller_->UpdateWindow();
648    cursor_window_controller_->UpdateContainer();
649  }
650}
651
652void DisplayController::CreateOrUpdateNonDesktopDisplay(
653    const DisplayInfo& info) {
654  switch (GetDisplayManager()->second_display_mode()) {
655    case DisplayManager::MIRRORING:
656      mirror_window_controller_->UpdateWindow(info);
657      cursor_window_controller_->UpdateContainer();
658      virtual_keyboard_window_controller_->Close();
659      break;
660    case DisplayManager::VIRTUAL_KEYBOARD:
661      mirror_window_controller_->Close();
662      cursor_window_controller_->UpdateContainer();
663      virtual_keyboard_window_controller_->UpdateWindow(info);
664      break;
665    case DisplayManager::EXTENDED:
666      NOTREACHED();
667  }
668}
669
670void DisplayController::CloseNonDesktopDisplay() {
671  mirror_window_controller_->Close();
672  cursor_window_controller_->UpdateContainer();
673  virtual_keyboard_window_controller_->Close();
674}
675
676void DisplayController::PreDisplayConfigurationChange(bool clear_focus) {
677  FOR_EACH_OBSERVER(Observer, observers_, OnDisplayConfigurationChanging());
678  focus_activation_store_->Store(clear_focus);
679  gfx::Screen* screen = Shell::GetScreen();
680  gfx::Point point_in_screen = screen->GetCursorScreenPoint();
681  gfx::Display display = screen->GetDisplayNearestPoint(point_in_screen);
682  aura::Window* root_window = GetRootWindowForDisplayId(display.id());
683
684  aura::client::ScreenPositionClient* client =
685      aura::client::GetScreenPositionClient(root_window);
686  client->ConvertPointFromScreen(root_window, &point_in_screen);
687  root_window->GetHost()->ConvertPointToNativeScreen(&point_in_screen);
688  cursor_location_in_native_coords_for_restore_ = point_in_screen;
689}
690
691void DisplayController::PostDisplayConfigurationChange() {
692  if (limiter_)
693    limiter_->SetThrottleTimeout(kAfterDisplayChangeThrottleTimeoutMs);
694
695  focus_activation_store_->Restore();
696
697  DisplayManager* display_manager = GetDisplayManager();
698  DisplayLayoutStore* layout_store = display_manager->layout_store();
699  if (display_manager->num_connected_displays() > 1) {
700    DisplayIdPair pair = display_manager->GetCurrentDisplayIdPair();
701    layout_store->UpdateMirrorStatus(pair, display_manager->IsMirrored());
702    DisplayLayout layout = layout_store->GetRegisteredDisplayLayout(pair);
703
704    if (Shell::GetScreen()->GetNumDisplays() > 1 ) {
705      int64 primary_id = layout.primary_id;
706      SetPrimaryDisplayId(
707          primary_id == gfx::Display::kInvalidDisplayID ?
708          pair.first : primary_id);
709      // Update the primary_id in case the above call is
710      // ignored. Happens when a) default layout's primary id
711      // doesn't exist, or b) the primary_id has already been
712      // set to the same and didn't update it.
713      layout_store->UpdatePrimaryDisplayId(
714          pair, Shell::GetScreen()->GetPrimaryDisplay().id());
715    }
716  }
717  FOR_EACH_OBSERVER(Observer, observers_, OnDisplayConfigurationChanged());
718  UpdateHostWindowNames();
719  EnsurePointerInDisplays();
720}
721
722AshWindowTreeHost* DisplayController::AddWindowTreeHostForDisplay(
723    const gfx::Display& display,
724    const AshWindowTreeHostInitParams& init_params) {
725  static int host_count = 0;
726  const DisplayInfo& display_info =
727      GetDisplayManager()->GetDisplayInfo(display.id());
728  AshWindowTreeHostInitParams params_with_bounds(init_params);
729  params_with_bounds.initial_bounds = display_info.bounds_in_native();
730  AshWindowTreeHost* ash_host = AshWindowTreeHost::Create(params_with_bounds);
731  aura::WindowTreeHost* host = ash_host->AsWindowTreeHost();
732
733  host->window()->SetName(base::StringPrintf("RootWindow-%d", host_count++));
734  host->window()->set_title(base::UTF8ToUTF16(display_info.name()));
735  host->compositor()->SetBackgroundColor(SK_ColorBLACK);
736  // No need to remove our observer observer because the DisplayController
737  // outlives the host.
738  host->AddObserver(this);
739  InitRootWindowSettings(host->window())->display_id = display.id();
740  host->InitHost();
741
742  window_tree_hosts_[display.id()] = ash_host;
743  SetDisplayPropertiesOnHost(ash_host, display);
744
745#if defined(OS_CHROMEOS)
746  static bool force_constrain_pointer_to_root =
747      CommandLine::ForCurrentProcess()->HasSwitch(
748          switches::kAshConstrainPointerToRoot);
749  if (base::SysInfo::IsRunningOnChromeOS() || force_constrain_pointer_to_root)
750    ash_host->ConfineCursorToRootWindow();
751#endif
752  return ash_host;
753}
754
755void DisplayController::OnFadeOutForSwapDisplayFinished() {
756#if defined(OS_CHROMEOS)
757  SetPrimaryDisplay(ScreenUtil::GetSecondaryDisplay());
758  Shell::GetInstance()->display_configurator_animation()
759      ->StartFadeInAnimation();
760#endif
761}
762
763void DisplayController::SetMirrorModeAfterAnimation(bool mirror) {
764  GetDisplayManager()->SetMirrorMode(mirror);
765}
766
767void DisplayController::UpdateHostWindowNames() {
768#if defined(USE_X11)
769  // crbug.com/120229 - set the window title for the primary dislpay
770  // to "aura_root_0" so gtalk can find the primary root window to broadcast.
771  // TODO(jhorwich) Remove this once Chrome supports window-based broadcasting.
772  aura::Window* primary = Shell::GetPrimaryRootWindow();
773  aura::Window::Windows root_windows = Shell::GetAllRootWindows();
774  for (size_t i = 0; i < root_windows.size(); ++i) {
775    std::string name =
776        root_windows[i] == primary ? "aura_root_0" : "aura_root_x";
777    gfx::AcceleratedWidget xwindow =
778        root_windows[i]->GetHost()->GetAcceleratedWidget();
779    XStoreName(gfx::GetXDisplay(), xwindow, name.c_str());
780  }
781#endif
782}
783
784}  // namespace ash
785