chrome/browser/ui/ash/multi_user/multi_user_window_manager

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
IsUserEvent
IsProcessingUserEvent
RecordUMAForTransferredWindowType
previous_animation_time_
OnAppWindowAdded
OnAppWindowIconChanged
OnAppWindowRemoved
animations_disabled_
SetWindowOwner
GetWindowOwner
ShowWindowForUser
AreWindowsSharedAmongUsers
GetOwnersOfVisibleWindows
IsWindowOnDesktopOfUser
GetUserPresentingWindow
AddUser
AddObserver
RemoveObserver
ActiveUserChanged
OnWindowDestroyed
OnWindowVisibilityChanging
OnWindowVisibilityChanged
OnTransientChildAdded
OnTransientChildRemoved
Observe
SetAnimationsForTest
IsAnimationRunningForTest
GetCurrentUserForTest
ShowWindowForUserIntern
TransitionUser
TransitionWallpaper
TransitionUserShelf
AddBrowserWindow
SetWindowVisibility
ShowWithTransientChildrenRecursive
GetOwningWindowInTransientChain
AddTransientOwnerRecursive
RemoveTransientOwnerRecursive
SetWindowVisible
// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/ui/ash/multi_user/multi_user_window_manager_chromeos.h"

#include "apps/app_window.h"
#include "apps/app_window_registry.h"
#include "ash/ash_switches.h"
#include "ash/desktop_background/user_wallpaper_delegate.h"
#include "ash/multi_profile_uma.h"
#include "ash/root_window_controller.h"
#include "ash/session_state_delegate.h"
#include "ash/shelf/shelf.h"
#include "ash/shelf/shelf_layout_manager.h"
#include "ash/shell.h"
#include "ash/shell_delegate.h"
#include "ash/shell_window_ids.h"
#include "ash/wm/mru_window_tracker.h"
#include "ash/wm/window_positioner.h"
#include "ash/wm/window_state.h"
#include "base/auto_reset.h"
#include "base/message_loop/message_loop.h"
#include "base/strings/string_util.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/chrome_notification_types.h"
#include "chrome/browser/chromeos/login/user_manager.h"
#include "chrome/browser/chromeos/login/wallpaper_manager.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/profiles/profile_manager.h"
#include "chrome/browser/ui/ash/launcher/chrome_launcher_controller.h"
#include "chrome/browser/ui/ash/multi_user/multi_user_notification_blocker_chromeos.h"
#include "chrome/browser/ui/ash/multi_user/multi_user_util.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_finder.h"
#include "chrome/browser/ui/browser_list.h"
#include "chrome/browser/ui/browser_window.h"
#include "content/public/browser/notification_service.h"
#include "google_apis/gaia/gaia_auth_util.h"
#include "ui/aura/client/aura_constants.h"
#include "ui/aura/window.h"
#include "ui/aura/window_event_dispatcher.h"
#include "ui/base/ui_base_types.h"
#include "ui/events/event.h"
#include "ui/message_center/message_center.h"
#include "ui/wm/core/transient_window_manager.h"
#include "ui/wm/core/window_animations.h"
#include "ui/wm/core/window_util.h"
#include "ui/wm/public/activation_client.h"

namespace {

// The animation time in milliseconds for a single window which is fading
// in / out.
static int kAnimationTimeMS = 100;

// The animation time in millseconds for the fade in and / or out when switching
// users.
static int kUserFadeTimeMS = 110;

// The animation time in ms for a window which get teleported to another screen.
static int kTeleportAnimationTimeMS = 300;

// Checks if a given event is a user event.
bool IsUserEvent(ui::Event* e) {
  if (e) {
    ui::EventType type = e->type();
    if (type != ui::ET_CANCEL_MODE &&
        type != ui::ET_UMA_DATA &&
        type != ui::ET_UNKNOWN)
      return true;
  }
  return false;
}

// Test if we are currently processing a user event which might lead to a
// browser / app creation.
bool IsProcessingUserEvent() {
  // When there is a nested message loop (e.g. active menu or drag and drop
  // operation) - we are in a nested loop and can ignore this.
  // Note: Unit tests might not have a message loop.
  base::MessageLoop* message_loop = base::MessageLoop::current();
  if (message_loop && message_loop->is_running() && message_loop->IsNested())
    return false;

  // TODO(skuhne): "Open link in new window" will come here after the menu got
  // closed, executing the command from the nested menu loop. However at that
  // time there is no active event processed. A solution for that need to be
  // found past M-32. A global event handler filter (pre and post) might fix
  // that problem in conjunction with a depth counter - but - for the menu
  // execution we come here after the loop was finished (so it's not nested
  // anymore) and the root window should therefore still have the event which
  // lead to the menu invocation, but it is not. By fixing that problem this
  // would "magically work".
  aura::Window::Windows root_window_list = ash::Shell::GetAllRootWindows();
  for (aura::Window::Windows::iterator it = root_window_list.begin();
       it != root_window_list.end();
       ++it) {
    if (IsUserEvent((*it)->GetHost()->dispatcher()->current_event()))
      return true;
  }
  return false;
}

// Records the type of window which was transferred to another desktop.
void RecordUMAForTransferredWindowType(aura::Window* window) {
  // We need to figure out what kind of window this is to record the transfer.
  Browser* browser = chrome::FindBrowserWithWindow(window);
  ash::MultiProfileUMA::TeleportWindowType window_type =
      ash::MultiProfileUMA::TELEPORT_WINDOW_UNKNOWN;
  if (browser) {
    if (browser->profile()->IsOffTheRecord()) {
      window_type = ash::MultiProfileUMA::TELEPORT_WINDOW_INCOGNITO_BROWSER;
    } else if (browser->is_app()) {
      window_type = ash::MultiProfileUMA::TELEPORT_WINDOW_V1_APP;
    } else if (browser->is_type_popup()) {
      window_type = ash::MultiProfileUMA::TELEPORT_WINDOW_POPUP;
    } else {
      window_type = ash::MultiProfileUMA::TELEPORT_WINDOW_BROWSER;
    }
  } else {
    // Unit tests might come here without a profile manager.
    if (!g_browser_process->profile_manager())
      return;
    // If it is not a browser, it is probably be a V2 application. In that case
    // one of the AppWindowRegistry instances should know about it.
    apps::AppWindow* app_window = NULL;
    std::vector<Profile*> profiles =
        g_browser_process->profile_manager()->GetLoadedProfiles();
    for (std::vector<Profile*>::iterator it = profiles.begin();
         it != profiles.end() && app_window == NULL;
         it++) {
      app_window = apps::AppWindowRegistry::Get(*it)
                       ->GetAppWindowForNativeWindow(window);
    }
    if (app_window) {
      if (app_window->window_type() == apps::AppWindow::WINDOW_TYPE_PANEL ||
          app_window->window_type() == apps::AppWindow::WINDOW_TYPE_V1_PANEL) {
        window_type = ash::MultiProfileUMA::TELEPORT_WINDOW_PANEL;
      } else {
        window_type = ash::MultiProfileUMA::TELEPORT_WINDOW_V2_APP;
      }
    }
  }
  ash::MultiProfileUMA::RecordTeleportWindowType(window_type);
}

}  // namespace

namespace chrome {

// A class to temporarily change the animation properties for a window.
class AnimationSetter {
 public:
  AnimationSetter(aura::Window* window, int animation_time_in_ms)
      : window_(window),
        previous_animation_type_(
            wm::GetWindowVisibilityAnimationType(window_)),
        previous_animation_time_(
            wm::GetWindowVisibilityAnimationDuration(*window_)) {
    wm::SetWindowVisibilityAnimationType(
        window_,
        wm::WINDOW_VISIBILITY_ANIMATION_TYPE_FADE);
    wm::SetWindowVisibilityAnimationDuration(
        window_,
        base::TimeDelta::FromMilliseconds(animation_time_in_ms));
  }

  ~AnimationSetter() {
    wm::SetWindowVisibilityAnimationType(window_,
                                                    previous_animation_type_);
    wm::SetWindowVisibilityAnimationDuration(
        window_,
        previous_animation_time_);
  }

 private:
  // The window which gets used.
  aura::Window* window_;

  // Previous animation type.
  const int previous_animation_type_;

  // Previous animation time.
  const base::TimeDelta previous_animation_time_;

  DISALLOW_COPY_AND_ASSIGN(AnimationSetter);
};

// logic while the user gets switched.
class UserChangeActionDisabler {
 public:
  UserChangeActionDisabler() {
    ash::WindowPositioner::DisableAutoPositioning(true);
    ash::Shell::GetInstance()->mru_window_tracker()->SetIgnoreActivations(true);
  }

  ~UserChangeActionDisabler() {
    ash::WindowPositioner::DisableAutoPositioning(false);
    ash::Shell::GetInstance()->mru_window_tracker()->SetIgnoreActivations(
        false);
  }
 private:

  DISALLOW_COPY_AND_ASSIGN(UserChangeActionDisabler);
};

// This class keeps track of all applications which were started for a user.
// When an app gets created, the window will be tagged for that user. Note
// that the destruction does not need to be tracked here since the universal
// window observer will take care of that.
class AppObserver : public apps::AppWindowRegistry::Observer {
 public:
  explicit AppObserver(const std::string& user_id) : user_id_(user_id) {}
  virtual ~AppObserver() {}

  // AppWindowRegistry::Observer overrides:
  virtual void OnAppWindowAdded(apps::AppWindow* app_window) OVERRIDE {
    aura::Window* window = app_window->GetNativeWindow();
    DCHECK(window);
    MultiUserWindowManagerChromeOS::GetInstance()->SetWindowOwner(window,
                                                                  user_id_);
  }
  virtual void OnAppWindowIconChanged(apps::AppWindow* app_window) OVERRIDE {}
  virtual void OnAppWindowRemoved(apps::AppWindow* app_window) OVERRIDE {}

 private:
  std::string user_id_;

  DISALLOW_COPY_AND_ASSIGN(AppObserver);
};

MultiUserWindowManagerChromeOS::MultiUserWindowManagerChromeOS(
    const std::string& current_user_id)
    : current_user_id_(current_user_id),
      notification_blocker_(new MultiUserNotificationBlockerChromeOS(
          message_center::MessageCenter::Get(), this, current_user_id)),
      suppress_visibility_changes_(false),
      animations_disabled_(false) {
  // Add a session state observer to be able to monitor session changes.
  if (ash::Shell::HasInstance())
    ash::Shell::GetInstance()->session_state_delegate()->
        AddSessionStateObserver(this);

  // The BrowserListObserver would have been better to use then the old
  // notification system, but that observer fires before the window got created.
  registrar_.Add(this, NOTIFICATION_BROWSER_WINDOW_READY,
                 content::NotificationService::AllSources());

  // Add an app window observer & all already running apps.
  Profile* profile = multi_user_util::GetProfileFromUserID(current_user_id);
  if (profile)
    AddUser(profile);
}

MultiUserWindowManagerChromeOS::~MultiUserWindowManagerChromeOS() {
  // Remove all window observers.
  WindowToEntryMap::iterator window = window_to_entry_.begin();
  while (window != window_to_entry_.end()) {
    OnWindowDestroyed(window->first);
    window = window_to_entry_.begin();
  }

  // Remove all app observers.
  UserIDToAppWindowObserver::iterator app_observer_iterator =
      user_id_to_app_observer_.begin();
  while (app_observer_iterator != user_id_to_app_observer_.end()) {
    Profile* profile = multi_user_util::GetProfileFromUserID(
        app_observer_iterator->first);
    DCHECK(profile);
    apps::AppWindowRegistry::Get(profile)
        ->RemoveObserver(app_observer_iterator->second);
    delete app_observer_iterator->second;
    user_id_to_app_observer_.erase(app_observer_iterator);
    app_observer_iterator = user_id_to_app_observer_.begin();
  }

  if (ash::Shell::HasInstance())
    ash::Shell::GetInstance()->session_state_delegate()->
        RemoveSessionStateObserver(this);
}

void MultiUserWindowManagerChromeOS::SetWindowOwner(
    aura::Window* window,
    const std::string& user_id) {
  // Make sure the window is valid and there was no owner yet.
  DCHECK(window);
  DCHECK(!user_id.empty());
  if (GetWindowOwner(window) == user_id)
    return;
  DCHECK(GetWindowOwner(window).empty());
  window_to_entry_[window] = new WindowEntry(user_id);

  // Remember the initial visibility of the window.
  window_to_entry_[window]->set_show(window->IsVisible());

  // Add observers to track state changes.
  window->AddObserver(this);
  wm::TransientWindowManager::Get(window)->AddObserver(this);

  // Check if this window was created due to a user interaction. If it was,
  // transfer it to the current user.
  if (IsProcessingUserEvent())
    window_to_entry_[window]->set_show_for_user(current_user_id_);

  // Add all transient children to our set of windows. Note that the function
  // will add the children but not the owner to the transient children map.
  AddTransientOwnerRecursive(window, window);

  // Notify entry adding.
  FOR_EACH_OBSERVER(Observer, observers_, OnOwnerEntryAdded(window));

  if (!IsWindowOnDesktopOfUser(window, current_user_id_))
    SetWindowVisibility(window, false, 0);
}

const std::string& MultiUserWindowManagerChromeOS::GetWindowOwner(
    aura::Window* window) {
  WindowToEntryMap::iterator it = window_to_entry_.find(window);
  return it != window_to_entry_.end() ? it->second->owner()
                                      : base::EmptyString();
}

void MultiUserWindowManagerChromeOS::ShowWindowForUser(
    aura::Window* window,
    const std::string& user_id) {
  std::string previous_owner(GetUserPresentingWindow(window));
  if (!ShowWindowForUserIntern(window, user_id))
    return;
  // The window switched to a new desktop and we have to switch to that desktop,
  // but only when it was on the visible desktop and the the target is not the
  // visible desktop.
  if (user_id == current_user_id_ || previous_owner != current_user_id_)
    return;

  ash::Shell::GetInstance()->session_state_delegate()->SwitchActiveUser(
      user_id);
}

bool MultiUserWindowManagerChromeOS::AreWindowsSharedAmongUsers() {
  WindowToEntryMap::iterator it = window_to_entry_.begin();
  for (; it != window_to_entry_.end(); ++it) {
    if (it->second->owner() != it->second->show_for_user())
      return true;
  }
  return false;
}

void MultiUserWindowManagerChromeOS::GetOwnersOfVisibleWindows(
    std::set<std::string>* user_ids) {
  for (WindowToEntryMap::iterator it = window_to_entry_.begin();
       it != window_to_entry_.end(); ++it) {
    if (it->first->IsVisible())
      user_ids->insert(it->second->owner());
  }
}

bool MultiUserWindowManagerChromeOS::IsWindowOnDesktopOfUser(
    aura::Window* window,
    const std::string& user_id) {
  const std::string& presenting_user = GetUserPresentingWindow(window);
  return presenting_user.empty() || presenting_user == user_id;
}

const std::string& MultiUserWindowManagerChromeOS::GetUserPresentingWindow(
    aura::Window* window) {
  WindowToEntryMap::iterator it = window_to_entry_.find(window);
  // If the window is not owned by anyone it is shown on all desktops and we
  // return the empty string.
  if (it == window_to_entry_.end())
    return base::EmptyString();
  // Otherwise we ask the object for its desktop.
  return it->second->show_for_user();
}

void MultiUserWindowManagerChromeOS::AddUser(content::BrowserContext* context) {
  Profile* profile = Profile::FromBrowserContext(context);
  const std::string& user_id = multi_user_util::GetUserIDFromProfile(profile);
  if (user_id_to_app_observer_.find(user_id) != user_id_to_app_observer_.end())
    return;

  user_id_to_app_observer_[user_id] = new AppObserver(user_id);
  apps::AppWindowRegistry::Get(profile)
      ->AddObserver(user_id_to_app_observer_[user_id]);

  // Account all existing application windows of this user accordingly.
  const apps::AppWindowRegistry::AppWindowList& app_windows =
      apps::AppWindowRegistry::Get(profile)->app_windows();
  apps::AppWindowRegistry::AppWindowList::const_iterator it =
      app_windows.begin();
  for (; it != app_windows.end(); ++it)
    user_id_to_app_observer_[user_id]->OnAppWindowAdded(*it);

  // Account all existing browser windows of this user accordingly.
  BrowserList* browser_list = BrowserList::GetInstance(HOST_DESKTOP_TYPE_ASH);
  BrowserList::const_iterator browser_it = browser_list->begin();
  for (; browser_it != browser_list->end(); ++browser_it) {
    if ((*browser_it)->profile()->GetOriginalProfile() == profile)
      AddBrowserWindow(*browser_it);
  }
}

void MultiUserWindowManagerChromeOS::AddObserver(Observer* observer) {
  observers_.AddObserver(observer);
}

void MultiUserWindowManagerChromeOS::RemoveObserver(Observer* observer) {
  observers_.RemoveObserver(observer);
}

void MultiUserWindowManagerChromeOS::ActiveUserChanged(
    const std::string& user_id) {
  DCHECK(user_id != current_user_id_);
  current_user_id_ = user_id;
  // If there is an animation in progress finish the pending switch which also
  // kills the timer (if there is one).
  if (user_changed_animation_timer_.get())
    TransitionUser(SHOW_NEW_USER);

  // Start the animation by hiding the old user.
  TransitionUser(HIDE_OLD_USER);

  // If animations are disabled we immediately switch to the new user, otherwise
  // we create a timer which will fade in the new user once the other user has
  // been faded away.
  if (animations_disabled_) {
    TransitionUser(SHOW_NEW_USER);
  } else {
    user_changed_animation_timer_.reset(new base::Timer(
        FROM_HERE,
        base::TimeDelta::FromMilliseconds(kUserFadeTimeMS),
        base::Bind(&MultiUserWindowManagerChromeOS::TransitionUser,
                   base::Unretained(this),
                   SHOW_NEW_USER),
        false));
    user_changed_animation_timer_->Reset();
  }
}

void MultiUserWindowManagerChromeOS::OnWindowDestroyed(aura::Window* window) {
  if (GetWindowOwner(window).empty()) {
    // This must be a window in the transient chain - remove it and its
    // children from the owner.
    RemoveTransientOwnerRecursive(window);
    return;
  }
  wm::TransientWindowManager::Get(window)->RemoveObserver(this);
  // Remove the window from the owners list.
  delete window_to_entry_[window];
  window_to_entry_.erase(window);

  // Notify entry change.
  FOR_EACH_OBSERVER(Observer, observers_, OnOwnerEntryRemoved(window));
}

void MultiUserWindowManagerChromeOS::OnWindowVisibilityChanging(
    aura::Window* window, bool visible) {
  // This command gets called first and immediately when show or hide gets
  // called. We remember here the desired state for restoration IF we were
  // not ourselves issuing the call.
  // Note also that using the OnWindowVisibilityChanged callback cannot be
  // used for this.
  if (suppress_visibility_changes_)
    return;

  WindowToEntryMap::iterator it = window_to_entry_.find(window);
  // If the window is not owned by anyone it is shown on all desktops.
  if (it != window_to_entry_.end()) {
    // Remember what was asked for so that we can restore this when the user's
    // desktop gets restored.
    it->second->set_show(visible);
  } else {
    TransientWindowToVisibility::iterator it =
        transient_window_to_visibility_.find(window);
    if (it != transient_window_to_visibility_.end())
      it->second = visible;
  }
}

void MultiUserWindowManagerChromeOS::OnWindowVisibilityChanged(
    aura::Window* window, bool visible) {
  if (suppress_visibility_changes_)
    return;

  // Don't allow to make the window visible if it shouldn't be.
  if (visible && !IsWindowOnDesktopOfUser(window, current_user_id_)) {
    SetWindowVisibility(window, false, 0);
    return;
  }
  aura::Window* owned_parent = GetOwningWindowInTransientChain(window);
  if (owned_parent && owned_parent != window && visible &&
      !IsWindowOnDesktopOfUser(owned_parent, current_user_id_))
    SetWindowVisibility(window, false, 0);
}

void MultiUserWindowManagerChromeOS::OnTransientChildAdded(
    aura::Window* window,
    aura::Window* transient_window) {
  if (!GetWindowOwner(window).empty()) {
    AddTransientOwnerRecursive(transient_window, window);
    return;
  }
  aura::Window* owned_parent =
      GetOwningWindowInTransientChain(transient_window);
  if (!owned_parent)
    return;

  AddTransientOwnerRecursive(transient_window, owned_parent);
}

void MultiUserWindowManagerChromeOS::OnTransientChildRemoved(
    aura::Window* window,
    aura::Window* transient_window) {
  // Remove the transient child if the window itself is owned, or one of the
  // windows in its transient parents chain.
  if (!GetWindowOwner(window).empty() ||
      GetOwningWindowInTransientChain(window))
    RemoveTransientOwnerRecursive(transient_window);
}

void MultiUserWindowManagerChromeOS::Observe(
    int type,
    const content::NotificationSource& source,
    const content::NotificationDetails& details) {
  if (type == NOTIFICATION_BROWSER_WINDOW_READY)
    AddBrowserWindow(content::Source<Browser>(source).ptr());
}

void MultiUserWindowManagerChromeOS::SetAnimationsForTest(bool disable) {
  animations_disabled_ = disable;
}

bool MultiUserWindowManagerChromeOS::IsAnimationRunningForTest() {
  return user_changed_animation_timer_.get() != NULL;
}

const std::string& MultiUserWindowManagerChromeOS::GetCurrentUserForTest() {
  return current_user_id_;
}

bool MultiUserWindowManagerChromeOS::ShowWindowForUserIntern(
    aura::Window* window,
    const std::string& user_id) {
  // If there is either no owner, or the owner is the current user, no action
  // is required.
  const std::string& owner = GetWindowOwner(window);
  if (owner.empty() ||
      (owner == user_id && IsWindowOnDesktopOfUser(window, user_id)))
    return false;

  bool minimized = ash::wm::GetWindowState(window)->IsMinimized();
  // Check that we are not trying to transfer ownership of a minimized window.
  if (user_id != owner && minimized)
    return false;

  if (minimized) {
    // If it is minimized it falls back to the original desktop.
    ash::MultiProfileUMA::RecordTeleportAction(
        ash::MultiProfileUMA::TELEPORT_WINDOW_RETURN_BY_MINIMIZE);
  } else {
    // If the window was transferred without getting minimized, we should record
    // the window type.
    RecordUMAForTransferredWindowType(window);
  }

  WindowToEntryMap::iterator it = window_to_entry_.find(window);
  it->second->set_show_for_user(user_id);

  // Show the window if the added user is the current one.
  if (user_id == current_user_id_) {
    // Only show the window if it should be shown according to its state.
    if (it->second->show())
      SetWindowVisibility(window, true, kTeleportAnimationTimeMS);
  } else {
    SetWindowVisibility(window, false, kTeleportAnimationTimeMS);
  }

  // Notify entry change.
  FOR_EACH_OBSERVER(Observer, observers_, OnOwnerEntryChanged(window));
  return true;
}

void MultiUserWindowManagerChromeOS::TransitionUser(
    MultiUserWindowManagerChromeOS::AnimationStep animation_step) {
  TransitionWallpaper(animation_step);
  TransitionUserShelf(animation_step);

  // Disable the window position manager and the MRU window tracker temporarily.
  scoped_ptr<UserChangeActionDisabler> disabler(new UserChangeActionDisabler);

  // We need to show/hide the windows in the same order as they were created in
  // their parent window(s) to keep the layer / window hierarchy in sync. To
  // achieve that we first collect all parent windows and then enumerate all
  // windows in those parent windows and show or hide them accordingly.

  // Create a list of all parent windows we have to check and their parents.
  std::set<aura::Window*> parent_list;
  for (WindowToEntryMap::iterator it = window_to_entry_.begin();
       it != window_to_entry_.end(); ++it) {
    aura::Window* parent = it->first->parent();
    if (parent_list.find(parent) == parent_list.end())
      parent_list.insert(parent);
  }

  // Traverse the found parent windows to handle their child windows in order of
  // their appearance.
  for (std::set<aura::Window*>::iterator it_parents = parent_list.begin();
       it_parents != parent_list.end(); ++it_parents) {
    const aura::Window::Windows window_list = (*it_parents)->children();
    for (aura::Window::Windows::const_iterator it_window = window_list.begin();
         it_window != window_list.end(); ++it_window) {
      aura::Window* window = *it_window;
      WindowToEntryMap::iterator it_map = window_to_entry_.find(window);
      if (it_map != window_to_entry_.end()) {
        bool should_be_visible =
            it_map->second->show_for_user() == current_user_id_ &&
            it_map->second->show();
        bool is_visible = window->IsVisible();
        ash::wm::WindowState* window_state = ash::wm::GetWindowState(window);
        if (animation_step == SHOW_NEW_USER &&
            it_map->second->owner() == current_user_id_ &&
            it_map->second->show_for_user() != current_user_id_ &&
            window_state->IsMinimized()) {
          // Pull back minimized visiting windows to the owners desktop.
          ShowWindowForUserIntern(window, current_user_id_);
          window_state->Unminimize();
        } else if (should_be_visible != is_visible &&
                   should_be_visible == (animation_step == SHOW_NEW_USER)) {
          SetWindowVisibility(window, should_be_visible, kUserFadeTimeMS);
        }
      }
    }
  }

  // Activation and real switch are happening after the other user gets shown.
  if (animation_step == SHOW_NEW_USER) {
    // Finally we need to restore the previously active window.
    ash::MruWindowTracker::WindowList mru_list =
        ash::Shell::GetInstance()->mru_window_tracker()->BuildMruWindowList();
    if (mru_list.size()) {
      aura::Window* window = mru_list[0];
      ash::wm::WindowState* window_state = ash::wm::GetWindowState(window);
      if (IsWindowOnDesktopOfUser(window, current_user_id_) &&
          !window_state->IsMinimized()) {
        aura::client::ActivationClient* client =
            aura::client::GetActivationClient(window->GetRootWindow());
        // Several unit tests come here without an activation client.
        if (client)
          client->ActivateWindow(window);
      }
    }

    // This is called directly here to make sure notification_blocker will see
    // the new window status.
    notification_blocker_->ActiveUserChanged(current_user_id_);

    // We can reset the timer at this point.
    // Note: The timer can be destroyed while it is performing its task.
    user_changed_animation_timer_.reset();
  }
}

void MultiUserWindowManagerChromeOS::TransitionWallpaper(
    MultiUserWindowManagerChromeOS::AnimationStep animation_step) {
  // Handle the wallpaper switch.
  ash::UserWallpaperDelegate* wallpaper_delegate =
      ash::Shell::GetInstance()->user_wallpaper_delegate();
  if (animation_step == HIDE_OLD_USER) {
    // Set the wallpaper cross dissolve animation duration to our complete
    // animation cycle for a fade in and fade out.
    wallpaper_delegate->SetAnimationDurationOverride(2 * kUserFadeTimeMS);
    chromeos::WallpaperManager::Get()->SetUserWallpaperDelayed(
        current_user_id_);
  } else {
    // Revert the wallpaper cross dissolve animation duration back to the
    // default.
    wallpaper_delegate->SetAnimationDurationOverride(0);
  }
}

void MultiUserWindowManagerChromeOS::TransitionUserShelf(
    MultiUserWindowManagerChromeOS::AnimationStep animation_step) {
  // The shelf animation duration override.
  int duration_override = kUserFadeTimeMS;
  // Handle the shelf order of items. This is done once the old user is hidden.
  if (animation_step == SHOW_NEW_USER) {
    // Some unit tests have no ChromeLauncherController.
    if (ChromeLauncherController::instance())
      ChromeLauncherController::instance()->ActiveUserChanged(current_user_id_);
    // We kicked off the shelf animation in the command above. As such we can
    // disable the override now again.
    duration_override = 0;
  }

  if (animations_disabled_)
    return;

  ash::Shell::RootWindowControllerList controller =
      ash::Shell::GetInstance()->GetAllRootWindowControllers();
  for (ash::Shell::RootWindowControllerList::iterator it1 = controller.begin();
       it1 != controller.end(); ++it1) {
    (*it1)->GetShelfLayoutManager()->SetAnimationDurationOverride(
        duration_override);
  }

  // For each root window hide the shelf.
  if (animation_step == HIDE_OLD_USER) {
    aura::Window::Windows root_windows = ash::Shell::GetAllRootWindows();
    for (aura::Window::Windows::const_iterator iter = root_windows.begin();
         iter != root_windows.end(); ++iter) {
      ash::Shell::GetInstance()->SetShelfAutoHideBehavior(
          ash::SHELF_AUTO_HIDE_ALWAYS_HIDDEN, *iter);
    }
  }
}

void MultiUserWindowManagerChromeOS::AddBrowserWindow(Browser* browser) {
  // A unit test (e.g. CrashRestoreComplexTest.RestoreSessionForThreeUsers) can
  // come here with no valid window.
  if (!browser->window() || !browser->window()->GetNativeWindow())
    return;
  SetWindowOwner(browser->window()->GetNativeWindow(),
                 multi_user_util::GetUserIDFromProfile(browser->profile()));
}

void MultiUserWindowManagerChromeOS::SetWindowVisibility(
    aura::Window* window, bool visible, int animation_time_in_ms) {
  if (window->IsVisible() == visible)
    return;

  // Hiding a system modal dialog should not be allowed. Instead we switch to
  // the user which is showing the system modal window.
  // Note that in some cases (e.g. unit test) windows might not have a root
  // window.
  if (!visible && window->GetRootWindow()) {
    // Get the system modal container for the window's root window.
    aura::Window* system_modal_container =
        window->GetRootWindow()->GetChildById(
            ash::kShellWindowId_SystemModalContainer);
    if (window->parent() == system_modal_container) {
      // The window is system modal and we need to find the parent which owns
      // it so that we can switch to the desktop accordingly.
      std::string user_id = GetUserPresentingWindow(window);
      if (user_id.empty()) {
        aura::Window* owning_window = GetOwningWindowInTransientChain(window);
        DCHECK(owning_window);
        user_id = GetUserPresentingWindow(owning_window);
        DCHECK(!user_id.empty());
      }
      ash::Shell::GetInstance()->session_state_delegate()->SwitchActiveUser(
          user_id);
      return;
    }
  }

  // To avoid that these commands are recorded as any other commands, we are
  // suppressing any window entry changes while this is going on.
  base::AutoReset<bool> suppressor(&suppress_visibility_changes_, true);

  if (visible) {
    ShowWithTransientChildrenRecursive(window, animation_time_in_ms);
  } else {
    if (window->HasFocus())
      window->Blur();
    SetWindowVisible(window, false, animation_time_in_ms);
  }
}

void MultiUserWindowManagerChromeOS::ShowWithTransientChildrenRecursive(
    aura::Window* window, int animation_time_in_ms) {
  aura::Window::Windows::const_iterator it =
      wm::GetTransientChildren(window).begin();
  for (; it != wm::GetTransientChildren(window).end(); ++it)
    ShowWithTransientChildrenRecursive(*it, animation_time_in_ms);

  // We show all children which were not explicitly hidden.
  TransientWindowToVisibility::iterator it2 =
      transient_window_to_visibility_.find(window);
  if (it2 == transient_window_to_visibility_.end() || it2->second)
    SetWindowVisible(window, true, animation_time_in_ms);
}

aura::Window* MultiUserWindowManagerChromeOS::GetOwningWindowInTransientChain(
    aura::Window* window) {
  if (!GetWindowOwner(window).empty())
    return NULL;
  aura::Window* parent = wm::GetTransientParent(window);
  while (parent) {
    if (!GetWindowOwner(parent).empty())
      return parent;
    parent = wm::GetTransientParent(parent);
  }
  return NULL;
}

void MultiUserWindowManagerChromeOS::AddTransientOwnerRecursive(
    aura::Window* window,
    aura::Window* owned_parent) {
  // First add all child windows.
  aura::Window::Windows::const_iterator it =
      wm::GetTransientChildren(window).begin();
  for (; it != wm::GetTransientChildren(window).end(); ++it)
    AddTransientOwnerRecursive(*it, owned_parent);

  // If this window is the owned window, we do not have to handle it again.
  if (window == owned_parent)
    return;

  // Remember the current visibility.
  DCHECK(transient_window_to_visibility_.find(window) ==
             transient_window_to_visibility_.end());
  transient_window_to_visibility_[window] = window->IsVisible();

  // Add observers to track state changes.
  window->AddObserver(this);
  wm::TransientWindowManager::Get(window)->AddObserver(this);

  // Hide the window if it should not be shown. Note that this hide operation
  // will hide recursively this and all children - but we have already collected
  // their initial view state.
  if (!IsWindowOnDesktopOfUser(owned_parent, current_user_id_))
    SetWindowVisibility(window, false, kAnimationTimeMS);
}

void MultiUserWindowManagerChromeOS::RemoveTransientOwnerRecursive(
    aura::Window* window) {
  // First remove all child windows.
  aura::Window::Windows::const_iterator it =
      wm::GetTransientChildren(window).begin();
  for (; it != wm::GetTransientChildren(window).end(); ++it)
    RemoveTransientOwnerRecursive(*it);

  // Find from transient window storage the visibility for the given window,
  // set the visibility accordingly and delete the window from the map.
  TransientWindowToVisibility::iterator visibility_item =
      transient_window_to_visibility_.find(window);
  DCHECK(visibility_item != transient_window_to_visibility_.end());

  window->RemoveObserver(this);
  wm::TransientWindowManager::Get(window)->RemoveObserver(this);

  bool unowned_view_state = visibility_item->second;
  transient_window_to_visibility_.erase(visibility_item);
  if (unowned_view_state && !window->IsVisible()) {
    // To prevent these commands from being recorded as any other commands, we
    // are suppressing any window entry changes while this is going on.
    // Instead of calling SetWindowVisible, only show gets called here since all
    // dependents have been shown previously already.
    base::AutoReset<bool> suppressor(&suppress_visibility_changes_, true);
    window->Show();
  }
}

void MultiUserWindowManagerChromeOS::SetWindowVisible(
    aura::Window* window,
    bool visible,
    int animation_time_in_ms) {
  AnimationSetter animation_setter(
      window,
      animations_disabled_ ? 0 : animation_time_in_ms);

  if (visible)
    window->Show();
  else
    window->Hide();

  // Make sure that animations have no influence on the window state after the
  // call.
  DCHECK_EQ(visible, window->IsVisible());
}

}  // namespace chrome
/* [<][>][^][v][top][bottom][index][help] */
root/chrome/browser/ui/ash/multi_user/multi_user_window_manager_chromeos.cc

DEFINITIONS
