Quelle nsFocusManager.cpp Sprache: C

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/dom/BrowserParent.h"

#include "nsFocusManager.h"

#include "LayoutConstants.h"
#include "ChildIterator.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsGkAtoms.h"
#include "nsContentUtils.h"
#include "ContentParent.h"
#include "nsPIDOMWindow.h"
#include "nsIContentInlines.h"
#include "nsIDocShell.h"
#include "nsIDocShellTreeOwner.h"
#include "nsIFormControl.h"
#include "nsLayoutUtils.h"
#include "nsFrameTraversal.h"
#include "nsIWebNavigation.h"
#include "nsCaret.h"
#include "nsIBaseWindow.h"
#include "nsIAppWindow.h"
#include "nsTextControlFrame.h"
#include "nsThreadUtils.h"
#include "nsViewManager.h"
#include "nsFrameSelection.h"
#include "mozilla/dom/Selection.h"
#include "nsXULPopupManager.h"
#include "nsMenuPopupFrame.h"
#include "nsIScriptError.h"
#include "nsIScriptObjectPrincipal.h"
#include "nsIPrincipal.h"
#include "nsIObserverService.h"
#include "BrowserChild.h"
#include "nsFrameLoader.h"
#include "nsHTMLDocument.h"
#include "nsNetUtil.h"
#include "nsRange.h"
#include "nsFrameLoaderOwner.h"
#include "nsQueryObject.h"
#include "nsIXULRuntime.h"

#include "mozilla/AccessibleCaretEventHub.h"
#include "mozilla/ContentEvents.h"
#include "mozilla/FocusModel.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/DocumentInlines.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/ElementBinding.h"
#include "mozilla/dom/HTMLImageElement.h"
#include "mozilla/dom/HTMLInputElement.h"
#include "mozilla/dom/HTMLSlotElement.h"
#include "mozilla/dom/HTMLAreaElement.h"
#include "mozilla/dom/BrowserBridgeChild.h"
#include "mozilla/dom/Text.h"
#include "mozilla/dom/XULPopupElement.h"
#include "mozilla/dom/WindowGlobalParent.h"
#include "mozilla/dom/WindowGlobalChild.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/HTMLEditor.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/Maybe.h"
#include "mozilla/PointerLockManager.h"
#include "mozilla/Preferences.h"
#include "mozilla/PresShell.h"
#include "mozilla/Services.h"
#include "mozilla/Unused.h"
#include "mozilla/StaticPrefs_accessibility.h"
#include "mozilla/StaticPrefs_full_screen_api.h"
#include "mozilla/Try.h"
#include "mozilla/widget/IMEData.h"
#include <algorithm>

#include "nsIDOMXULMenuListElement.h"

#ifdef ACCESSIBILITY
#  include "nsAccessibilityService.h"
#endif

using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::widget;

// Two types of focus pr logging are available:
//   'Focus' for normal focus manager calls
//   'FocusNavigation' for tab and document navigation
LazyLogModule gFocusLog("Focus");
LazyLogModule gFocusNavigationLog("FocusNavigation");

#define LOGFOCUS(args) MOZ_LOG(gFocusLog, mozilla::LogLevel::Debug, args)
#define LOGFOCUSNAVIGATION(args) \
  MOZ_LOG(gFocusNavigationLog, mozilla::LogLevel::Debug, args)

#define LOGTAG(log, format, content)                      \
  if (MOZ_LOG_TEST(log, LogLevel::Debug)) {               \
    nsAutoCString tag("(none)"_ns);                       \
    if (content) {                                        \
      content->NodeInfo()->NameAtom()->ToUTF8String(tag); \
    }                                                     \
    MOZ_LOG(log, LogLevel::Debug, (format, tag.get()));   \
  }

#define LOGCONTENT(format, content) LOGTAG(gFocusLog, format, content)
#define LOGCONTENTNAVIGATION(format, content) \
  LOGTAG(gFocusNavigationLog, format, content)

struct nsDelayedBlurOrFocusEvent {
  nsDelayedBlurOrFocusEvent(EventMessage aEventMessage, PresShell* aPresShell,
                            Document* aDocument, EventTarget* aTarget,
                            EventTarget* aRelatedTarget)
      : mPresShell(aPresShell),
        mDocument(aDocument),
        mTarget(aTarget),
        mEventMessage(aEventMessage),
        mRelatedTarget(aRelatedTarget) {}

  nsDelayedBlurOrFocusEvent(const nsDelayedBlurOrFocusEvent& aOther)
      : mPresShell(aOther.mPresShell),
        mDocument(aOther.mDocument),
        mTarget(aOther.mTarget),
        mEventMessage(aOther.mEventMessage) {}

  RefPtr<PresShell> mPresShell;
  nsCOMPtr<Document> mDocument;
  nsCOMPtr<EventTarget> mTarget;
  EventMessage mEventMessage;
  nsCOMPtr<EventTarget> mRelatedTarget;
};

inline void ImplCycleCollectionUnlink(nsDelayedBlurOrFocusEvent& aField) {
  aField.mPresShell = nullptr;
  aField.mDocument = nullptr;
  aField.mTarget = nullptr;
  aField.mRelatedTarget = nullptr;
}

inline void ImplCycleCollectionTraverse(
    nsCycleCollectionTraversalCallback& aCallback,
    nsDelayedBlurOrFocusEvent& aField, const char* aName, uint32_t aFlags = 0) {
  CycleCollectionNoteChild(
      aCallback, static_cast<nsIDocumentObserver*>(aField.mPresShell.get()),
      aName, aFlags);
  CycleCollectionNoteChild(aCallback, aField.mDocument.get(), aName, aFlags);
  CycleCollectionNoteChild(aCallback, aField.mTarget.get(), aName, aFlags);
  CycleCollectionNoteChild(aCallback, aField.mRelatedTarget.get(), aName,
                           aFlags);
}

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsFocusManager)
  NS_INTERFACE_MAP_ENTRY(nsIFocusManager)
  NS_INTERFACE_MAP_ENTRY(nsIObserver)
  NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIFocusManager)
NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTING_ADDREF(nsFocusManager)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsFocusManager)

NS_IMPL_CYCLE_COLLECTION_WEAK(nsFocusManager, mActiveWindow,
                              mActiveBrowsingContextInContent,
                              mActiveBrowsingContextInChrome, mFocusedWindow,
                              mFocusedBrowsingContextInContent,
                              mFocusedBrowsingContextInChrome, mFocusedElement,
                              mFirstBlurEvent, mFirstFocusEvent,
                              mWindowBeingLowered, mDelayedBlurFocusEvents)

StaticRefPtr<nsFocusManager> nsFocusManager::sInstance;
bool nsFocusManager::sTestMode = false;
uint64_t nsFocusManager::sFocusActionCounter = 0;

static const char* kObservedPrefs[] = {"accessibility.browsewithcaret",
                                       "focusmanager.testmode", nullptr};

nsFocusManager::nsFocusManager()
    : mActionIdForActiveBrowsingContextInContent(0),
      mActionIdForActiveBrowsingContextInChrome(0),
      mActionIdForFocusedBrowsingContextInContent(0),
      mActionIdForFocusedBrowsingContextInChrome(0),
      mActiveBrowsingContextInContentSetFromOtherProcess(false),
      mEventHandlingNeedsFlush(false) {}

nsFocusManager::~nsFocusManager() {
  Preferences::UnregisterCallbacks(nsFocusManager::PrefChanged, kObservedPrefs,
                                   this);

  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
  if (obs) {
    obs->RemoveObserver(this, "xpcom-shutdown");
  }
}

// static
nsresult nsFocusManager::Init() {
  sInstance = new nsFocusManager();

  sTestMode = Preferences::GetBool("focusmanager.testmode", false);

  Preferences::RegisterCallbacks(nsFocusManager::PrefChanged, kObservedPrefs,
                                 sInstance.get());

  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
  if (obs) {
    obs->AddObserver(sInstance, "xpcom-shutdown", true);
  }

  return NS_OK;
}

// static
void nsFocusManager::Shutdown() { sInstance = nullptr; }

// static
void nsFocusManager::PrefChanged(const char* aPref, void* aSelf) {
  if (RefPtr<nsFocusManager> fm = static_cast<nsFocusManager*>(aSelf)) {
    fm->PrefChanged(aPref);
  }
}

void nsFocusManager::PrefChanged(const char* aPref) {
  nsDependentCString pref(aPref);
  if (pref.EqualsLiteral("accessibility.browsewithcaret")) {
    UpdateCaretForCaretBrowsingMode();
  } else if (pref.EqualsLiteral("focusmanager.testmode")) {
    sTestMode = Preferences::GetBool("focusmanager.testmode", false);
  }
}

NS_IMETHODIMP
nsFocusManager::Observe(nsISupports* aSubject, const char* aTopic,
                        const char16_t* aData) {
  if (!nsCRT::strcmp(aTopic, "xpcom-shutdown")) {
    mActiveWindow = nullptr;
    mActiveBrowsingContextInContent = nullptr;
    mActionIdForActiveBrowsingContextInContent = 0;
    mActionIdForFocusedBrowsingContextInContent = 0;
    mActiveBrowsingContextInChrome = nullptr;
    mActionIdForActiveBrowsingContextInChrome = 0;
    mActionIdForFocusedBrowsingContextInChrome = 0;
    mFocusedWindow = nullptr;
    mFocusedBrowsingContextInContent = nullptr;
    mFocusedBrowsingContextInChrome = nullptr;
    mFocusedElement = nullptr;
    mFirstBlurEvent = nullptr;
    mFirstFocusEvent = nullptr;
    mWindowBeingLowered = nullptr;
    mDelayedBlurFocusEvents.Clear();
  }

  return NS_OK;
}

static bool ActionIdComparableAndLower(uint64_t aActionId,
                                       uint64_t aReference) {
  MOZ_ASSERT(aActionId, "Uninitialized action id");
  auto [actionProc, actionId] =
      nsContentUtils::SplitProcessSpecificId(aActionId);
  auto [refProc, refId] = nsContentUtils::SplitProcessSpecificId(aReference);
  return actionProc == refProc && actionId < refId;
}

// given a frame content node, retrieve the nsIDOMWindow displayed in it
static nsPIDOMWindowOuter* GetContentWindow(nsIContent* aContent) {
  if (Document* doc = aContent->GetComposedDoc()) {
    if (Document* subdoc = doc->GetSubDocumentFor(aContent)) {
      return subdoc->GetWindow();
    }
  }
  return nullptr;
}

bool nsFocusManager::IsFocused(nsIContent* aContent) {
  if (!aContent || !mFocusedElement) {
    return false;
  }
  return aContent == mFocusedElement;
}

bool nsFocusManager::IsTestMode() { return sTestMode; }

bool nsFocusManager::IsInActiveWindow(BrowsingContext* aBC) const {
  RefPtr<BrowsingContext> top = aBC->Top();
  if (XRE_IsParentProcess()) {
    top = top->Canonical()->TopCrossChromeBoundary();
  }
  return IsSameOrAncestor(top, GetActiveBrowsingContext());
}

// get the current window for the given content node
static nsPIDOMWindowOuter* GetCurrentWindow(nsIContent* aContent) {
  Document* doc = aContent->GetComposedDoc();
  return doc ? doc->GetWindow() : nullptr;
}

// static
Element* nsFocusManager::GetFocusedDescendant(
    nsPIDOMWindowOuter* aWindow, SearchRange aSearchRange,
    nsPIDOMWindowOuter** aFocusedWindow) {
  NS_ENSURE_TRUE(aWindow, nullptr);

  *aFocusedWindow = nullptr;

  Element* currentElement = nullptr;
  nsPIDOMWindowOuter* window = aWindow;
  for (;;) {
    *aFocusedWindow = window;
    currentElement = window->GetFocusedElement();
    if (!currentElement || aSearchRange == eOnlyCurrentWindow) {
      break;
    }

    window = GetContentWindow(currentElement);
    if (!window) {
      break;
    }

    if (aSearchRange == eIncludeAllDescendants) {
      continue;
    }

    MOZ_ASSERT(aSearchRange == eIncludeVisibleDescendants);

    // If the child window doesn't have PresShell, it means the window is
    // invisible.
    nsIDocShell* docShell = window->GetDocShell();
    if (!docShell) {
      break;
    }
    if (!docShell->GetPresShell()) {
      break;
    }
  }

  NS_IF_ADDREF(*aFocusedWindow);

  return currentElement;
}

// static
InputContextAction::Cause nsFocusManager::GetFocusMoveActionCause(
    uint32_t aFlags) {
  if (aFlags & nsIFocusManager::FLAG_BYTOUCH) {
    return InputContextAction::CAUSE_TOUCH;
  } else if (aFlags & nsIFocusManager::FLAG_BYMOUSE) {
    return InputContextAction::CAUSE_MOUSE;
  } else if (aFlags & nsIFocusManager::FLAG_BYKEY) {
    return InputContextAction::CAUSE_KEY;
  } else if (aFlags & nsIFocusManager::FLAG_BYLONGPRESS) {
    return InputContextAction::CAUSE_LONGPRESS;
  }
  return InputContextAction::CAUSE_UNKNOWN;
}

NS_IMETHODIMP
nsFocusManager::GetActiveWindow(mozIDOMWindowProxy** aWindow) {
  MOZ_ASSERT(XRE_IsParentProcess(),
             "Must not be called outside the parent process.");
  NS_IF_ADDREF(*aWindow = mActiveWindow);
  return NS_OK;
}

NS_IMETHODIMP
nsFocusManager::GetActiveBrowsingContext(BrowsingContext** aBrowsingContext) {
  NS_IF_ADDREF(*aBrowsingContext = GetActiveBrowsingContext());
  return NS_OK;
}

void nsFocusManager::FocusWindow(nsPIDOMWindowOuter* aWindow,
                                 CallerType aCallerType) {
  if (RefPtr<nsFocusManager> fm = sInstance) {
    fm->SetFocusedWindowWithCallerType(aWindow, aCallerType);
  }
}

NS_IMETHODIMP
nsFocusManager::GetFocusedWindow(mozIDOMWindowProxy** aFocusedWindow) {
  NS_IF_ADDREF(*aFocusedWindow = mFocusedWindow);
  return NS_OK;
}

NS_IMETHODIMP
nsFocusManager::GetFocusedContentBrowsingContext(
    BrowsingContext** aBrowsingContext) {
  MOZ_DIAGNOSTIC_ASSERT(
      XRE_IsParentProcess(),
      "We only have use cases for this in the parent process");
  NS_IF_ADDREF(*aBrowsingContext = GetFocusedBrowsingContextInChrome());
  return NS_OK;
}

NS_IMETHODIMP
nsFocusManager::GetActiveContentBrowsingContext(
    BrowsingContext** aBrowsingContext) {
  MOZ_DIAGNOSTIC_ASSERT(
      XRE_IsParentProcess(),
      "We only have use cases for this in the parent process");
  NS_IF_ADDREF(*aBrowsingContext = GetActiveBrowsingContextInChrome());
  return NS_OK;
}

nsresult nsFocusManager::SetFocusedWindowWithCallerType(
    mozIDOMWindowProxy* aWindowToFocus, CallerType aCallerType) {
  LOGFOCUS(("<>"));

  nsCOMPtr<nsPIDOMWindowOuter> windowToFocus =
      nsPIDOMWindowOuter::From(aWindowToFocus);
  NS_ENSURE_TRUE(windowToFocus, NS_ERROR_FAILURE);

  nsCOMPtr<Element> frameElement = windowToFocus->GetFrameElementInternal();
  Maybe<uint64_t> existingActionId;
  if (frameElement) {
    // pass false for aFocusChanged so that the caret does not get updated
    // and scrolling does not occur.
    existingActionId = SetFocusInner(frameElement, 0, false, true);
  } else if (auto* bc = windowToFocus->GetBrowsingContext();
             bc && !bc->IsTop()) {
    // No frameElement means windowToFocus is an OOP iframe, so
    // the above SetFocusInner is not called. That means the focus
    // of the currently focused BC is not going to be cleared. So
    // we do that manually here.
    if (RefPtr<BrowsingContext> focusedBC = GetFocusedBrowsingContext()) {
      // If focusedBC is an ancestor of bc, blur will be handled
      // correctly by nsFocusManager::AdjustWindowFocus.
      if (!IsSameOrAncestor(focusedBC, bc)) {
        existingActionId.emplace(sInstance->GenerateFocusActionId());
        Blur(focusedBC, nullptr, true, true, false, existingActionId.value());
      }
    }
  } else {
    // this is a top-level window. If the window has a child frame focused,
    // clear the focus. Otherwise, focus should already be in this frame, or
    // already cleared. This ensures that focus will be in this frame and not
    // in a child.
    if (Element* el = windowToFocus->GetFocusedElement()) {
      if (nsCOMPtr<nsPIDOMWindowOuter> childWindow = GetContentWindow(el)) {
        ClearFocus(windowToFocus);
      }
    }
  }

  nsCOMPtr<nsPIDOMWindowOuter> rootWindow = windowToFocus->GetPrivateRoot();
  const uint64_t actionId = existingActionId.isSome()
                                ? existingActionId.value()
                                : sInstance->GenerateFocusActionId();
  if (rootWindow) {
    RaiseWindow(rootWindow, aCallerType, actionId);
  }

  LOGFOCUS(("< PRIu64 ">>", actionId));

  return NS_OK;
}

NS_IMETHODIMP nsFocusManager::SetFocusedWindow(
    mozIDOMWindowProxy* aWindowToFocus) {
  return SetFocusedWindowWithCallerType(aWindowToFocus, CallerType::System);
}

NS_IMETHODIMP
nsFocusManager::GetFocusedElement(Element** aFocusedElement) {
  RefPtr<Element> focusedElement = mFocusedElement;
  focusedElement.forget(aFocusedElement);
  return NS_OK;
}

uint32_t nsFocusManager::GetLastFocusMethod(nsPIDOMWindowOuter* aWindow) const {
  nsPIDOMWindowOuter* window = aWindow ? aWindow : mFocusedWindow.get();
  uint32_t method = window ? window->GetFocusMethod() : 0;
  NS_ASSERTION((method & METHOD_MASK) == method, "invalid focus method");
  return method;
}

NS_IMETHODIMP
nsFocusManager::GetLastFocusMethod(mozIDOMWindowProxy* aWindow,
                                   uint32_t* aLastFocusMethod) {
  *aLastFocusMethod = GetLastFocusMethod(nsPIDOMWindowOuter::From(aWindow));
  return NS_OK;
}

NS_IMETHODIMP
nsFocusManager::SetFocus(Element* aElement, uint32_t aFlags) {
  LOGFOCUS(("<>"));

  NS_ENSURE_ARG(aElement);

  SetFocusInner(aElement, aFlags, true, true);

  LOGFOCUS(("<>"));

  return NS_OK;
}

NS_IMETHODIMP
nsFocusManager::ElementIsFocusable(Element* aElement, uint32_t aFlags,
                                   bool* aIsFocusable) {
  NS_ENSURE_TRUE(aElement, NS_ERROR_INVALID_ARG);
  *aIsFocusable = !!FlushAndCheckIfFocusable(aElement, aFlags);
  return NS_OK;
}

MOZ_CAN_RUN_SCRIPT_BOUNDARY NS_IMETHODIMP
nsFocusManager::MoveFocus(mozIDOMWindowProxy* aWindow, Element* aStartElement,
                          uint32_t aType, uint32_t aFlags, Element** aElement) {
  *aElement = nullptr;

  LOGFOCUS(("<>", aType, aFlags));

  if (MOZ_LOG_TEST(gFocusLog, LogLevel::Debug) && mFocusedWindow) {
    Document* doc = mFocusedWindow->GetExtantDoc();
    if (doc && doc->GetDocumentURI()) {
      LOGFOCUS((" Focused Window: %p %s", mFocusedWindow.get(),
                doc->GetDocumentURI()->GetSpecOrDefault().get()));
    }
  }

  LOGCONTENT(" Current Focus: %s", mFocusedElement.get());

  // use FLAG_BYMOVEFOCUS when switching focus with MoveFocus unless one of
  // the other focus methods is already set, or we're just moving to the root
  // or caret position.
  if (aType != MOVEFOCUS_ROOT && aType != MOVEFOCUS_CARET &&
      (aFlags & METHOD_MASK) == 0) {
    aFlags |= FLAG_BYMOVEFOCUS;
  }

  nsCOMPtr<nsPIDOMWindowOuter> window;
  if (aStartElement) {
    window = GetCurrentWindow(aStartElement);
  } else {
    window = aWindow ? nsPIDOMWindowOuter::From(aWindow) : mFocusedWindow.get();
  }

  NS_ENSURE_TRUE(window, NS_ERROR_FAILURE);

  // Flush to ensure that focusability of descendants is computed correctly.
  if (RefPtr<Document> doc = window->GetExtantDoc()) {
    doc->FlushPendingNotifications(FlushType::EnsurePresShellInitAndFrames);
  }

  bool noParentTraversal = aFlags & FLAG_NOPARENTFRAME;
  nsCOMPtr<nsIContent> newFocus;
  nsresult rv = DetermineElementToMoveFocus(window, aStartElement, aType,
                                            noParentTraversal, true,
                                            getter_AddRefs(newFocus));
  if (rv == NS_SUCCESS_DOM_NO_OPERATION) {
    return NS_OK;
  }

  NS_ENSURE_SUCCESS(rv, rv);

  LOGCONTENTNAVIGATION("Element to be focused: %s", newFocus.get());

  if (newFocus && newFocus->IsElement()) {
    // for caret movement, pass false for the aFocusChanged argument,
    // otherwise the caret will end up moving to the focus position. This
    // would be a problem because the caret would move to the beginning of the
    // focused link making it impossible to navigate the caret over a link.
    SetFocusInner(MOZ_KnownLive(newFocus->AsElement()), aFlags,
                  aType != MOVEFOCUS_CARET, true);
    *aElement = do_AddRef(newFocus->AsElement()).take();
  } else if (aType == MOVEFOCUS_ROOT || aType == MOVEFOCUS_CARET) {
    // no content was found, so clear the focus for these two types.
    ClearFocus(window);
  }

  LOGFOCUS(("<>"));

  return NS_OK;
}

NS_IMETHODIMP
nsFocusManager::ClearFocus(mozIDOMWindowProxy* aWindow) {
  LOGFOCUS(("<>"));

  // if the window to clear is the focused window or an ancestor of the
  // focused window, then blur the existing focused content. Otherwise, the
  // focus is somewhere else so just update the current node.
  NS_ENSURE_TRUE(aWindow, NS_ERROR_INVALID_ARG);
  nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);

  if (IsSameOrAncestor(window, GetFocusedBrowsingContext())) {
    RefPtr<BrowsingContext> bc = window->GetBrowsingContext();
    RefPtr<BrowsingContext> focusedBC = GetFocusedBrowsingContext();
    const bool isAncestor = (focusedBC != bc);
    RefPtr<BrowsingContext> ancestorBC = isAncestor ? bc : nullptr;
    if (Blur(focusedBC, ancestorBC, isAncestor, true, false,
             GenerateFocusActionId())) {
      // if we are clearing the focus on an ancestor of the focused window,
      // the ancestor will become the new focused window, so focus it
      if (isAncestor) {
        // Intentionally use a new actionId here because the above
        // Blur() will clear the focus of the ancestors of focusedBC, and
        // this Focus() call might need to update the focus of those ancestors,
        // so it needs to have a newer actionId to make that happen.
        Focus(window, nullptr, 0, true, false, false, true,
              GenerateFocusActionId());
      }
    }
  } else {
    window->SetFocusedElement(nullptr);
  }

  LOGFOCUS(("<>"));

  return NS_OK;
}

NS_IMETHODIMP
nsFocusManager::GetFocusedElementForWindow(mozIDOMWindowProxy* aWindow,
                                           bool aDeep,
                                           mozIDOMWindowProxy** aFocusedWindow,
                                           Element** aElement) {
  *aElement = nullptr;
  if (aFocusedWindow) {
    *aFocusedWindow = nullptr;
  }

  NS_ENSURE_TRUE(aWindow, NS_ERROR_INVALID_ARG);
  nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);

  nsCOMPtr<nsPIDOMWindowOuter> focusedWindow;
  RefPtr<Element> focusedElement =
      GetFocusedDescendant(window,
                           aDeep ? nsFocusManager::eIncludeAllDescendants
                                 : nsFocusManager::eOnlyCurrentWindow,
                           getter_AddRefs(focusedWindow));

  focusedElement.forget(aElement);

  if (aFocusedWindow) {
    NS_IF_ADDREF(*aFocusedWindow = focusedWindow);
  }

  return NS_OK;
}

NS_IMETHODIMP
nsFocusManager::MoveCaretToFocus(mozIDOMWindowProxy* aWindow) {
  nsCOMPtr<nsIWebNavigation> webnav = do_GetInterface(aWindow);
  nsCOMPtr<nsIDocShellTreeItem> dsti = do_QueryInterface(webnav);
  if (dsti) {
    if (dsti->ItemType() != nsIDocShellTreeItem::typeChrome) {
      nsCOMPtr<nsIDocShell> docShell = do_QueryInterface(dsti);
      NS_ENSURE_TRUE(docShell, NS_ERROR_FAILURE);

      // don't move the caret for editable documents
      bool isEditable;
      docShell->GetEditable(&isEditable);
      if (isEditable) {
        return NS_OK;
      }

      RefPtr<PresShell> presShell = docShell->GetPresShell();
      NS_ENSURE_TRUE(presShell, NS_ERROR_FAILURE);

      nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);
      if (RefPtr<Element> focusedElement = window->GetFocusedElement()) {
        MoveCaretToFocus(presShell, focusedElement);
      }
    }
  }

  return NS_OK;
}

void nsFocusManager::WindowRaised(mozIDOMWindowProxy* aWindow,
                                  uint64_t aActionId) {
  if (!aWindow) {
    return;
  }

  nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);
  BrowsingContext* bc = window->GetBrowsingContext();

  if (MOZ_LOG_TEST(gFocusLog, LogLevel::Debug)) {
    LOGFOCUS(("Window %p Raised [Currently: %p %p] actionid: %" PRIu64, aWindow,
              mActiveWindow.get(), mFocusedWindow.get(), aActionId));
    Document* doc = window->GetExtantDoc();
    if (doc && doc->GetDocumentURI()) {
      LOGFOCUS((" Raised Window: %p %s", aWindow,
                doc->GetDocumentURI()->GetSpecOrDefault().get()));
    }
    if (mActiveWindow) {
      doc = mActiveWindow->GetExtantDoc();
      if (doc && doc->GetDocumentURI()) {
        LOGFOCUS((" Active Window: %p %s", mActiveWindow.get(),
                  doc->GetDocumentURI()->GetSpecOrDefault().get()));
      }
    }
  }

  if (XRE_IsParentProcess()) {
    if (mActiveWindow == window) {
      // The window is already active, so there is no need to focus anything,
      // but make sure that the right widget is focused. This is a special case
      // for Windows because when restoring a minimized window, a second
      // activation will occur and the top-level widget could be focused instead
      // of the child we want. We solve this by calling SetFocus to ensure that
      // what the focus manager thinks should be the current widget is actually
      // focused.
      EnsureCurrentWidgetFocused(CallerType::System);
      return;
    }

    // lower the existing window, if any. This shouldn't happen usually.
    if (nsCOMPtr<nsPIDOMWindowOuter> activeWindow = mActiveWindow) {
      WindowLowered(activeWindow, aActionId);
    }
  } else if (bc->IsTop()) {
    BrowsingContext* active = GetActiveBrowsingContext();
    if (active == bc && !mActiveBrowsingContextInContentSetFromOtherProcess) {
      // EnsureCurrentWidgetFocused() should not be necessary with
      // PuppetWidget.
      return;
    }

    if (active && active != bc) {
      if (active->IsInProcess()) {
        nsCOMPtr<nsPIDOMWindowOuter> activeWindow = active->GetDOMWindow();
        WindowLowered(activeWindow, aActionId);
      }
      // No else, because trying to lower other-process windows
      // from here can result in the BrowsingContext no longer
      // existing in the parent process by the time it deserializes
      // the IPC message.
    }
  }

  nsCOMPtr<nsIDocShellTreeItem> docShellAsItem = window->GetDocShell();
  // If there's no docShellAsItem, this window must have been closed,
  // in that case there is no tree owner.
  if (!docShellAsItem) {
    return;
  }

  // set this as the active window
  if (XRE_IsParentProcess()) {
    mActiveWindow = window;
  } else if (bc->IsTop()) {
    SetActiveBrowsingContextInContent(bc, aActionId,
                                      false /* aIsEnteringBFCache */);
  }

  // ensure that the window is enabled and visible
  nsCOMPtr<nsIDocShellTreeOwner> treeOwner;
  docShellAsItem->GetTreeOwner(getter_AddRefs(treeOwner));
  if (nsCOMPtr<nsIBaseWindow> baseWindow = do_QueryInterface(treeOwner)) {
    bool isEnabled = true;
    if (NS_SUCCEEDED(baseWindow->GetEnabled(&isEnabled)) && !isEnabled) {
      return;
    }

    baseWindow->SetVisibility(true);
  }

  if (XRE_IsParentProcess()) {
    // Unsetting top-level focus upon lowering was inhibited to accommodate
    // ATOK, so we need to do it here.
    BrowserParent::UnsetTopLevelWebFocusAll();
    ActivateOrDeactivate(window, true);
  }

  // Retrieve the last focused element within the window that was raised.
  MoveFocusToWindowAfterRaise(window, aActionId);
}

void nsFocusManager::MoveFocusToWindowAfterRaise(nsPIDOMWindowOuter* aWindow,
                                                 uint64_t aActionId) {
  nsCOMPtr<nsPIDOMWindowOuter> currentWindow;
  RefPtr<Element> currentFocus = GetFocusedDescendant(
      aWindow, eIncludeAllDescendants, getter_AddRefs(currentWindow));

  NS_ASSERTION(currentWindow, "window raised with no window current");
  if (!currentWindow) {
    return;
  }

  // We use mFocusedWindow here is basically for the case that iframe navigate
  // from a.com to b.com for example, so it ends up being loaded in a different
  // process after Fission, but
  // currentWindow->GetBrowsingContext() == GetFocusedBrowsingContext() would
  // still be true because focused browsing context is synced, and we won't
  // fire a focus event while focusing if we use it as condition.
  Focus(currentWindow, currentFocus, /* aFlags = */ 0,
        /* aIsNewDocument = */ currentWindow != mFocusedWindow,
        /* aFocusChanged = */ false,
        /* aWindowRaised = */ true, /* aAdjustWidget = */ true, aActionId);
}

void nsFocusManager::WindowLowered(mozIDOMWindowProxy* aWindow,
                                   uint64_t aActionId) {
  if (!aWindow) {
    return;
  }

  nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);

  if (MOZ_LOG_TEST(gFocusLog, LogLevel::Debug)) {
    LOGFOCUS(("Window %p Lowered [Currently: %p %p]", aWindow,
              mActiveWindow.get(), mFocusedWindow.get()));
    Document* doc = window->GetExtantDoc();
    if (doc && doc->GetDocumentURI()) {
      LOGFOCUS((" Lowered Window: %s",
                doc->GetDocumentURI()->GetSpecOrDefault().get()));
    }
    if (mActiveWindow) {
      doc = mActiveWindow->GetExtantDoc();
      if (doc && doc->GetDocumentURI()) {
        LOGFOCUS((" Active Window: %s",
                  doc->GetDocumentURI()->GetSpecOrDefault().get()));
      }
    }
  }

  if (XRE_IsParentProcess()) {
    if (mActiveWindow != window) {
      return;
    }
  } else {
    BrowsingContext* bc = window->GetBrowsingContext();
    BrowsingContext* active = GetActiveBrowsingContext();
    if (active != bc->Top()) {
      return;
    }
  }

  // clear the mouse capture as the active window has changed
  PresShell::ReleaseCapturingContent();

  // In addition, reset the drag state to ensure that we are no longer in
  // drag-select mode.
  if (mFocusedWindow) {
    nsCOMPtr<nsIDocShell> docShell = mFocusedWindow->GetDocShell();
    if (docShell) {
      if (PresShell* presShell = docShell->GetPresShell()) {
        RefPtr<nsFrameSelection> frameSelection = presShell->FrameSelection();
        frameSelection->SetDragState(false);
      }
    }
  }

  if (XRE_IsParentProcess()) {
    ActivateOrDeactivate(window, false);
  }

  // keep track of the window being lowered, so that attempts to raise the
  // window can be prevented until we return. Otherwise, focus can get into
  // an unusual state.
  mWindowBeingLowered = window;
  if (XRE_IsParentProcess()) {
    mActiveWindow = nullptr;
  } else {
    BrowsingContext* bc = window->GetBrowsingContext();
    if (bc == bc->Top()) {
      SetActiveBrowsingContextInContent(nullptr, aActionId,
                                        false /* aIsEnteringBFCache */);
    }
  }

  if (mFocusedWindow) {
    Blur(nullptr, nullptr, true, true, false, aActionId);
  }

  mWindowBeingLowered = nullptr;
}

nsresult nsFocusManager::ContentRemoved(Document* aDocument,
                                        nsIContent* aContent) {
  NS_ENSURE_ARG(aDocument);
  NS_ENSURE_ARG(aContent);

  nsPIDOMWindowOuter* windowPtr = aDocument->GetWindow();
  if (!windowPtr) {
    return NS_OK;
  }

  // if the content is currently focused in the window, or is an
  // shadow-including inclusive ancestor of the currently focused element,
  // reset the focus within that window.
  Element* previousFocusedElementPtr = windowPtr->GetFocusedElement();
  if (!previousFocusedElementPtr) {
    return NS_OK;
  }

  if (!nsContentUtils::ContentIsHostIncludingDescendantOf(
          previousFocusedElementPtr, aContent)) {
    return NS_OK;
  }

  RefPtr<nsPIDOMWindowOuter> window = windowPtr;
  RefPtr<Element> previousFocusedElement = previousFocusedElementPtr;

  RefPtr<Element> newFocusedElement = [&]() -> Element* {
    if (auto* sr = ShadowRoot::FromNode(aContent)) {
      if (sr->IsUAWidget() && sr->Host()->IsHTMLElement(nsGkAtoms::input)) {
        return sr->Host();
      }
    }
    return nullptr;
  }();

  window->SetFocusedElement(newFocusedElement);

  // if this window is currently focused, clear the global focused
  // element as well, but don't fire any events.
  if (window->GetBrowsingContext() == GetFocusedBrowsingContext()) {
    mFocusedElement = newFocusedElement;
  } else if (Document* subdoc =
                 aDocument->GetSubDocumentFor(previousFocusedElement)) {
    // Check if the node that was focused is an iframe or similar by looking if
    // it has a subdocument. This would indicate that this focused iframe
    // and its descendants will be going away. We will need to move the focus
    // somewhere else, so just clear the focus in the toplevel window so that no
    // element is focused.
    //
    // The Fission case is handled in FlushAndCheckIfFocusable().
    if (nsCOMPtr<nsIDocShell> docShell = subdoc->GetDocShell()) {
      nsCOMPtr<nsPIDOMWindowOuter> childWindow = docShell->GetWindow();
      if (childWindow &&
          IsSameOrAncestor(childWindow, GetFocusedBrowsingContext())) {
        if (XRE_IsParentProcess()) {
          nsCOMPtr<nsPIDOMWindowOuter> activeWindow = mActiveWindow;
          ClearFocus(activeWindow);
        } else {
          BrowsingContext* active = GetActiveBrowsingContext();
          if (active) {
            if (active->IsInProcess()) {
              nsCOMPtr<nsPIDOMWindowOuter> activeWindow =
                  active->GetDOMWindow();
              ClearFocus(activeWindow);
            } else {
              mozilla::dom::ContentChild* contentChild =
                  mozilla::dom::ContentChild::GetSingleton();
              MOZ_ASSERT(contentChild);
              contentChild->SendClearFocus(active);
            }
          }  // no else, because ClearFocus does nothing with nullptr
        }
      }
    }
  }

  // Notify the editor in case we removed its ancestor limiter.
  if (previousFocusedElement->IsEditable()) {
    if (nsIDocShell* const docShell = aDocument->GetDocShell()) {
      if (HTMLEditor* const htmlEditor = docShell->GetHTMLEditor()) {
        Selection* const selection = htmlEditor->GetSelection();
        if (selection && selection->GetFrameSelection() &&
            previousFocusedElement ==
                selection->GetFrameSelection()->GetAncestorLimiter()) {
          // The editing host may be being removed right now.  So, it's already
          // removed from the child chain of the parent node, but it still know
          // the parent node.  This could cause unexpected result at scheduling
          // paint of the caret.  Therefore, we should call FinalizeSelection
          // after unblocking to run the script.
          nsContentUtils::AddScriptRunner(
              NewRunnableMethod("HTMLEditor::FinalizeSelection", htmlEditor,
                                &HTMLEditor::FinalizeSelection));
        }
      }
    }
  }

  if (!newFocusedElement) {
    NotifyFocusStateChange(previousFocusedElement, newFocusedElement, 0,
                           /* aGettingFocus = */ false, false);
  } else {
    // We should already have the right state, which is managed by the <input>
    // widget.
    MOZ_ASSERT(newFocusedElement->State().HasState(ElementState::FOCUS));
  }

  // If we changed focused element and the element still has focus, let's
  // notify IME of focus.  Note that if new focus move has already occurred
  // by running script, we should not let IMEStateManager of outdated focus
  // change.
  if (mFocusedElement == newFocusedElement && mFocusedWindow == window) {
    RefPtr<nsPresContext> presContext(aDocument->GetPresContext());
    IMEStateManager::OnChangeFocus(presContext, newFocusedElement,
                                   InputContextAction::Cause::CAUSE_UNKNOWN);
  }

  return NS_OK;
}

void nsFocusManager::WindowShown(mozIDOMWindowProxy* aWindow,
                                 bool aNeedsFocus) {
  if (!aWindow) {
    return;
  }

  nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);

  if (MOZ_LOG_TEST(gFocusLog, LogLevel::Debug)) {
    LOGFOCUS(("Window %p Shown [Currently: %p %p]", window.get(),
              mActiveWindow.get(), mFocusedWindow.get()));
    Document* doc = window->GetExtantDoc();
    if (doc && doc->GetDocumentURI()) {
      LOGFOCUS(("Shown Window: %s",
                doc->GetDocumentURI()->GetSpecOrDefault().get()));
    }

    if (mFocusedWindow) {
      doc = mFocusedWindow->GetExtantDoc();
      if (doc && doc->GetDocumentURI()) {
        LOGFOCUS((" Focused Window: %s",
                  doc->GetDocumentURI()->GetSpecOrDefault().get()));
      }
    }
  }

  if (XRE_IsParentProcess()) {
    if (BrowsingContext* bc = window->GetBrowsingContext()) {
      if (bc->IsTop()) {
        bc->SetIsActiveBrowserWindow(bc->GetIsActiveBrowserWindow());
      }
    }
  }

  if (XRE_IsParentProcess()) {
    if (mFocusedWindow != window) {
      return;
    }
  } else {
    BrowsingContext* bc = window->GetBrowsingContext();
    if (!bc || mFocusedBrowsingContextInContent != bc) {
      return;
    }
    // Sync the window for a newly-created OOP iframe
    // Set actionId to zero to signify that it should be ignored.
    SetFocusedWindowInternal(window, 0, false);
  }

  if (aNeedsFocus) {
    nsCOMPtr<nsPIDOMWindowOuter> currentWindow;
    RefPtr<Element> currentFocus = GetFocusedDescendant(
        window, eIncludeAllDescendants, getter_AddRefs(currentWindow));

    if (currentWindow) {
      Focus(currentWindow, currentFocus, 0, true, false, false, true,
            GenerateFocusActionId());
    }
  } else {
    // Sometimes, an element in a window can be focused before the window is
    // visible, which would mean that the widget may not be properly focused.
    // When the window becomes visible, make sure the right widget is focused.
    EnsureCurrentWidgetFocused(CallerType::System);
  }
}

void nsFocusManager::WindowHidden(mozIDOMWindowProxy* aWindow,
                                  uint64_t aActionId, bool aIsEnteringBFCache) {
  // if there is no window or it is not the same or an ancestor of the
  // currently focused window, just return, as the current focus will not
  // be affected.

  if (!aWindow) {
    return;
  }

  nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);

  if (MOZ_LOG_TEST(gFocusLog, LogLevel::Debug)) {
    LOGFOCUS(("Window %p Hidden [Currently: %p %p] actionid: %" PRIu64,
              window.get(), mActiveWindow.get(), mFocusedWindow.get(),
              aActionId));
    nsAutoCString spec;
    Document* doc = window->GetExtantDoc();
    if (doc && doc->GetDocumentURI()) {
      LOGFOCUS((" Hide Window: %s",
                doc->GetDocumentURI()->GetSpecOrDefault().get()));
    }

    if (mFocusedWindow) {
      doc = mFocusedWindow->GetExtantDoc();
      if (doc && doc->GetDocumentURI()) {
        LOGFOCUS((" Focused Window: %s",
                  doc->GetDocumentURI()->GetSpecOrDefault().get()));
      }
    }

    if (mActiveWindow) {
      doc = mActiveWindow->GetExtantDoc();
      if (doc && doc->GetDocumentURI()) {
        LOGFOCUS((" Active Window: %s",
                  doc->GetDocumentURI()->GetSpecOrDefault().get()));
      }
    }
  }

  if (!IsSameOrAncestor(window, mFocusedWindow)) {
    return;
  }

  // at this point, we know that the window being hidden is either the focused
  // window, or an ancestor of the focused window. Either way, the focus is no
  // longer valid, so it needs to be updated.

  const RefPtr<Element> oldFocusedElement = std::move(mFocusedElement);

  nsCOMPtr<nsIDocShell> focusedDocShell = mFocusedWindow->GetDocShell();
  if (!focusedDocShell) {
    return;
  }

  const RefPtr<PresShell> presShell = focusedDocShell->GetPresShell();

  if (oldFocusedElement && oldFocusedElement->IsInComposedDoc()) {
    NotifyFocusStateChange(oldFocusedElement, nullptr, 0, false, false);
    window->UpdateCommands(u"focus"_ns);

    if (presShell) {
      RefPtr<Document> composedDoc = oldFocusedElement->GetComposedDoc();
      SendFocusOrBlurEvent(eBlur, presShell, composedDoc, oldFocusedElement,
                           false);
    }
  }

  const RefPtr<nsPresContext> focusedPresContext =
      presShell ? presShell->GetPresContext() : nullptr;
  IMEStateManager::OnChangeFocus(focusedPresContext, nullptr,
                                 GetFocusMoveActionCause(0));
  if (presShell) {
    SetCaretVisible(presShell, false, nullptr);
  }

  // If a window is being "hidden" because its BrowsingContext is changing
  // remoteness, we don't want to handle docshell destruction by moving focus.
  // Instead, the focused browsing context should stay the way it is (so that
  // the newly "shown" window in the other process knows to take focus) and
  // we should just null out the process-local field.
  nsCOMPtr<nsIDocShell> docShellBeingHidden = window->GetDocShell();
  // Check if we're currently hiding a non-remote nsDocShell due to its
  // BrowsingContext navigating to become remote. Normally, when a focused
  // subframe is hidden, focus is moved to the frame element, but focus should
  // stay with the BrowsingContext when performing a process switch. We don't
  // need to consider process switches where the hiding docshell is already
  // remote (ie. GetEmbedderElement is nullptr), as shifting remoteness to the
  // frame element is handled elsewhere.
  if (docShellBeingHidden &&
      nsDocShell::Cast(docShellBeingHidden)->WillChangeProcess() &&
      docShellBeingHidden->GetBrowsingContext()->GetEmbedderElement()) {
    if (mFocusedWindow != window) {
      // The window being hidden is an ancestor of the focused window.
#ifdef DEBUG
      BrowsingContext* ancestor = window->GetBrowsingContext();
      BrowsingContext* bc = mFocusedWindow->GetBrowsingContext();
      for (;;) {
        if (!bc) {
          MOZ_ASSERT(false, "Should have found ancestor");
        }
        bc = bc->GetParent();
        if (ancestor == bc) {
          break;
        }
      }
#endif
      // This call adjusts the focused browsing context and window.
      // The latter gets nulled out immediately below.
      SetFocusedWindowInternal(window, aActionId);
    }
    mFocusedWindow = nullptr;
    window->SetFocusedElement(nullptr);
    return;
  }

  // if the docshell being hidden is being destroyed, then we want to move
  // focus somewhere else. Call ClearFocus on the toplevel window, which
  // will have the effect of clearing the focus and moving the focused window
  // to the toplevel window. But if the window isn't being destroyed, we are
  // likely just loading a new document in it, so we want to maintain the
  // focused window so that the new document gets properly focused.
  bool beingDestroyed = !docShellBeingHidden;
  if (docShellBeingHidden) {
    docShellBeingHidden->IsBeingDestroyed(&beingDestroyed);
  }
  if (beingDestroyed) {
    // There is usually no need to do anything if a toplevel window is going
    // away, as we assume that WindowLowered will be called. However, this may
    // not happen if nsIAppStartup::eForceQuit is used to quit, and can cause
    // a leak. So if the active window is being destroyed, call WindowLowered
    // directly.

    if (XRE_IsParentProcess()) {
      nsCOMPtr<nsPIDOMWindowOuter> activeWindow = mActiveWindow;
      if (activeWindow == mFocusedWindow || activeWindow == window) {
        WindowLowered(activeWindow, aActionId);
      } else {
        ClearFocus(activeWindow);
      }
    } else {
      BrowsingContext* active = GetActiveBrowsingContext();
      if (active) {
        if (nsCOMPtr<nsPIDOMWindowOuter> activeWindow =
                active->GetDOMWindow()) {
          if ((mFocusedWindow &&
               mFocusedWindow->GetBrowsingContext() == active) ||
              (window->GetBrowsingContext() == active)) {
            WindowLowered(activeWindow, aActionId);
          } else {
            ClearFocus(activeWindow);
          }
        }  // else do nothing when an out-of-process iframe is torn down
      }
    }
    return;
  }

  if (!XRE_IsParentProcess() &&
      mActiveBrowsingContextInContent ==
          docShellBeingHidden->GetBrowsingContext() &&
      mActiveBrowsingContextInContent->GetIsInBFCache()) {
    SetActiveBrowsingContextInContent(nullptr, aActionId, aIsEnteringBFCache);
  }

  // if the window being hidden is an ancestor of the focused window, adjust
  // the focused window so that it points to the one being hidden. This
  // ensures that the focused window isn't in a chain of frames that doesn't
  // exist any more.
  if (window != mFocusedWindow) {
    nsCOMPtr<nsIDocShellTreeItem> dsti =
        mFocusedWindow ? mFocusedWindow->GetDocShell() : nullptr;
    if (dsti) {
      nsCOMPtr<nsIDocShellTreeItem> parentDsti;
      dsti->GetInProcessParent(getter_AddRefs(parentDsti));
      if (parentDsti) {
        if (nsCOMPtr<nsPIDOMWindowOuter> parentWindow =
                parentDsti->GetWindow()) {
          parentWindow->SetFocusedElement(nullptr);
        }
      }
    }

    SetFocusedWindowInternal(window, aActionId);
  }
}

void nsFocusManager::FireDelayedEvents(Document* aDocument) {
  MOZ_ASSERT(aDocument);

  // fire any delayed focus and blur events in the same order that they were
  // added
  for (uint32_t i = 0; i < mDelayedBlurFocusEvents.Length(); i++) {
    if (mDelayedBlurFocusEvents[i].mDocument == aDocument) {
      if (!aDocument->GetInnerWindow() ||
          !aDocument->GetInnerWindow()->IsCurrentInnerWindow()) {
        // If the document was navigated away from or is defunct, don't bother
        // firing events on it. Note the symmetry between this condition and
        // the similar one in Document.cpp:FireOrClearDelayedEvents.
        mDelayedBlurFocusEvents.RemoveElementAt(i);
        --i;
      } else if (!aDocument->EventHandlingSuppressed()) {
        EventMessage message = mDelayedBlurFocusEvents[i].mEventMessage;
        nsCOMPtr<EventTarget> target = mDelayedBlurFocusEvents[i].mTarget;
        RefPtr<PresShell> presShell = mDelayedBlurFocusEvents[i].mPresShell;
        nsCOMPtr<EventTarget> relatedTarget =
            mDelayedBlurFocusEvents[i].mRelatedTarget;
        mDelayedBlurFocusEvents.RemoveElementAt(i);

        FireFocusOrBlurEvent(message, presShell, target, false, false,
                             relatedTarget);
        --i;
      }
    }
  }
}

void nsFocusManager::WasNuked(nsPIDOMWindowOuter* aWindow) {
  MOZ_ASSERT(aWindow, "Expected non-null window.");
  if (aWindow == mActiveWindow) {
    // TODO(emilio, bug 1933555): Figure out if we can assert below.
    // MOZ_ASSERT_UNREACHABLE("How come we're nuking a window that's still
    // active?");
    mActiveWindow = nullptr;
    SetActiveBrowsingContextInChrome(nullptr, GenerateFocusActionId());
  }
  if (aWindow == mFocusedWindow) {
    mFocusedWindow = nullptr;
    SetFocusedBrowsingContext(nullptr, GenerateFocusActionId());
    mFocusedElement = nullptr;
  }
}

nsFocusManager::BlurredElementInfo::BlurredElementInfo(Element& aElement)
    : mElement(aElement) {}

nsFocusManager::BlurredElementInfo::~BlurredElementInfo() = default;

// https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo
static bool ShouldMatchFocusVisible(nsPIDOMWindowOuter* aWindow,
                                    const Element& aElement,
                                    int32_t aFocusFlags) {
  // If we were explicitly requested to show the ring, do it.
  if (aFocusFlags & nsIFocusManager::FLAG_SHOWRING) {
    return true;
  }

  if (aFocusFlags & nsIFocusManager::FLAG_NOSHOWRING) {
    return false;
  }

  if (aWindow->ShouldShowFocusRing()) {
    // The window decision also trumps any other heuristic.
    return true;
  }

  // Any element which supports keyboard input (such as an input element, or any
  // other element which may trigger a virtual keyboard to be shown on focus if
  // a physical keyboard is not present) should always match :focus-visible when
  // focused.
  {
    if (aElement.IsHTMLElement(nsGkAtoms::textarea) || aElement.IsEditable()) {
      return true;
    }

    if (auto* input = HTMLInputElement::FromNode(aElement)) {
      if (input->IsSingleLineTextControl()) {
        return true;
      }
    }
  }

  switch (nsFocusManager::GetFocusMoveActionCause(aFocusFlags)) {
    case InputContextAction::CAUSE_KEY:
      // If the user interacts with the page via the keyboard, the currently
      // focused element should match :focus-visible (i.e. keyboard usage may
      // change whether this pseudo-class matches even if it doesn't affect
      // :focus).
      return true;
    case InputContextAction::CAUSE_UNKNOWN:
      // We render outlines if the last "known" focus method was by key or there
      // was no previous known focus method, otherwise we don't.
      return aWindow->UnknownFocusMethodShouldShowOutline();
    case InputContextAction::CAUSE_MOUSE:
    case InputContextAction::CAUSE_TOUCH:
    case InputContextAction::CAUSE_LONGPRESS:
      // If the user interacts with the page via a pointing device, such that
      // the focus is moved to a new element which does not support user input,
      // the newly focused element should not match :focus-visible.
      return false;
    case InputContextAction::CAUSE_UNKNOWN_CHROME:
    case InputContextAction::CAUSE_UNKNOWN_DURING_KEYBOARD_INPUT:
    case InputContextAction::CAUSE_UNKNOWN_DURING_NON_KEYBOARD_INPUT:
      // TODO(emilio): We could return some of these though, looking at
      // UserActivation. We may want to suppress focus rings for unknown /
      // programatic focus if the user is interacting with the page but not
      // during keyboard input, or such.
      MOZ_ASSERT_UNREACHABLE(
          "These don't get returned by GetFocusMoveActionCause");
      break;
  }
  return false;
}

/* static */
void nsFocusManager::NotifyFocusStateChange(Element* aElement,
                                            Element* aElementToFocus,
                                            int32_t aFlags, bool aGettingFocus,
                                            bool aShouldShowFocusRing) {
  MOZ_ASSERT_IF(aElementToFocus, !aGettingFocus);
  nsIContent* commonAncestor = nullptr;
  if (aElementToFocus) {
    commonAncestor = nsContentUtils::GetCommonFlattenedTreeAncestor(
        aElement, aElementToFocus);
  }

  if (aGettingFocus) {
    ElementState stateToAdd = ElementState::FOCUS;
    if (aShouldShowFocusRing) {
      stateToAdd |= ElementState::FOCUSRING;
    }
    aElement->AddStates(stateToAdd);

    for (nsIContent* host = aElement->GetContainingShadowHost(); host;
         host = host->GetContainingShadowHost()) {
      host->AsElement()->AddStates(ElementState::FOCUS);
    }
  } else {
    constexpr auto kStatesToRemove =
        ElementState::FOCUS | ElementState::FOCUSRING;
    aElement->RemoveStates(kStatesToRemove);
    for (nsIContent* host = aElement->GetContainingShadowHost(); host;
         host = host->GetContainingShadowHost()) {
      host->AsElement()->RemoveStates(kStatesToRemove);
    }
  }

  // Special case for <input type="checkbox"> and <input type="radio">.
  // The other browsers cancel active state when they gets lost focus, but
  // does not do it for the other elements such as <button> and <a href="...">.
  // Additionally, they may be activated with <label>, but they will get focus
  // at `click`, but activated at `mousedown`.  Therefore, we need to cancel
  // active state at moving focus.
  if (RefPtr<nsPresContext> presContext =
          aElement->GetPresContext(Element::PresContextFor::eForComposedDoc)) {
    RefPtr<EventStateManager> esm = presContext->EventStateManager();
    auto* activeInputElement =
        HTMLInputElement::FromNodeOrNull(esm->GetActiveContent());
    if (activeInputElement &&
        (activeInputElement->ControlType() == FormControlType::InputCheckbox ||
         activeInputElement->ControlType() == FormControlType::InputRadio) &&
        !activeInputElement->State().HasState(ElementState::FOCUS)) {
      esm->SetContentState(nullptr, ElementState::ACTIVE);
    }
  }

  for (nsIContent* content = aElement; content && content != commonAncestor;
       content = content->GetFlattenedTreeParent()) {
    Element* element = Element::FromNode(content);
    if (!element) {
      continue;
    }

    if (aGettingFocus) {
      if (element->State().HasState(ElementState::FOCUS_WITHIN)) {
        break;
      }
      element->AddStates(ElementState::FOCUS_WITHIN);
    } else {
      element->RemoveStates(ElementState::FOCUS_WITHIN);
    }
  }
}

// static
void nsFocusManager::EnsureCurrentWidgetFocused(CallerType aCallerType) {
  if (!mFocusedWindow || sTestMode) return;

  // get the main child widget for the focused window and ensure that the
  // platform knows that this widget is focused.
  nsCOMPtr<nsIDocShell> docShell = mFocusedWindow->GetDocShell();
  if (!docShell) {
    return;
  }
  RefPtr<PresShell> presShell = docShell->GetPresShell();
  if (!presShell) {
    return;
  }
  nsViewManager* vm = presShell->GetViewManager();
  if (!vm) {
    return;
  }
  nsCOMPtr<nsIWidget> widget = vm->GetRootWidget();
  if (!widget) {
    return;
  }
  widget->SetFocus(nsIWidget::Raise::No, aCallerType);
}

void nsFocusManager::ActivateOrDeactivate(nsPIDOMWindowOuter* aWindow,
                                          bool aActive) {
  MOZ_ASSERT(XRE_IsParentProcess());
  if (!aWindow) {
    return;
  }

  if (BrowsingContext* bc = aWindow->GetBrowsingContext()) {
    MOZ_ASSERT(bc->IsTop());

    RefPtr<CanonicalBrowsingContext> chromeTop =
        bc->Canonical()->TopCrossChromeBoundary();
    MOZ_ASSERT(bc == chromeTop);

    chromeTop->SetIsActiveBrowserWindow(aActive);
    chromeTop->CallOnAllTopDescendants(
        [aActive](CanonicalBrowsingContext* aBrowsingContext) {
          aBrowsingContext->SetIsActiveBrowserWindow(aActive);
          return CallState::Continue;
        },
        /* aIncludeNestedBrowsers = */ true);
  }

  if (aWindow->GetExtantDoc()) {
    nsContentUtils::DispatchEventOnlyToChrome(
        aWindow->GetExtantDoc(),
        nsGlobalWindowInner::Cast(aWindow->GetCurrentInnerWindow()),
        aActive ? u"activate"_ns : u"deactivate"_ns, CanBubble::eYes,
        Cancelable::eYes, nullptr);
  }
}

// Retrieves innerWindowId of the window of the last focused element to
// log a warning to the website console.
void LogWarningFullscreenWindowRaise(Element* aElement) {
  nsCOMPtr<nsFrameLoaderOwner> frameLoaderOwner(do_QueryInterface(aElement));
  NS_ENSURE_TRUE_VOID(frameLoaderOwner);

  RefPtr<nsFrameLoader> frameLoader = frameLoaderOwner->GetFrameLoader();
  NS_ENSURE_TRUE_VOID(frameLoaderOwner);

  RefPtr<BrowsingContext> browsingContext = frameLoader->GetBrowsingContext();
  NS_ENSURE_TRUE_VOID(browsingContext);

  WindowGlobalParent* windowGlobalParent =
      browsingContext->Canonical()->GetCurrentWindowGlobal();
  NS_ENSURE_TRUE_VOID(windowGlobalParent);

  // Log to console
  nsAutoString localizedMsg;
  nsTArray<nsString> params;
  nsresult rv = nsContentUtils::FormatLocalizedString(
      nsContentUtils::eDOM_PROPERTIES, "FullscreenExitWindowFocus", params,
      localizedMsg);

  NS_ENSURE_SUCCESS_VOID(rv);

  Unused << nsContentUtils::ReportToConsoleByWindowID(
      localizedMsg, nsIScriptError::warningFlag, "DOM"_ns,
      windowGlobalParent->InnerWindowId(),
      SourceLocation(windowGlobalParent->GetDocumentURI()));
}

// Ensure that when an embedded popup with a noautofocus attribute
// like a date picker is opened and focused, the parent page does not blur
static bool IsEmeddededInNoautofocusPopup(BrowsingContext& aBc) {
  auto* embedder = aBc.GetEmbedderElement();
  if (!embedder) {
    return false;
  }
  nsIFrame* f = embedder->GetPrimaryFrame();
  if (!f || !f->HasAnyStateBits(NS_FRAME_IN_POPUP)) {
    return false;
  }

  nsIFrame* menuPopup =
      nsLayoutUtils::GetClosestFrameOfType(f, LayoutFrameType::MenuPopup);
  MOZ_ASSERT(menuPopup, "NS_FRAME_IN_POPUP lied?");
  return static_cast<nsMenuPopupFrame*>(menuPopup)
      ->PopupElement()
      .GetXULBoolAttr(nsGkAtoms::noautofocus);
}

Maybe<uint64_t> nsFocusManager::SetFocusInner(Element* aNewContent,
                                              int32_t aFlags,
                                              bool aFocusChanged,
                                              bool aAdjustWidget) {
  // if the element is not focusable, just return and leave the focus as is
  RefPtr<Element> elementToFocus =
      FlushAndCheckIfFocusable(aNewContent, aFlags);
  if (!elementToFocus) {
    return Nothing();
  }

  const RefPtr<BrowsingContext> focusedBrowsingContext =
      GetFocusedBrowsingContext();

  // check if the element to focus is a frame (iframe) containing a child
  // document. Frames are never directly focused; instead focusing a frame
  // means focus what is inside the frame. To do this, the descendant content
  // within the frame is retrieved and that will be focused instead.
  nsCOMPtr<nsPIDOMWindowOuter> newWindow;
  nsCOMPtr<nsPIDOMWindowOuter> subWindow = GetContentWindow(elementToFocus);
  if (subWindow) {
    elementToFocus = GetFocusedDescendant(subWindow, eIncludeAllDescendants,
                                          getter_AddRefs(newWindow));

    // since a window is being refocused, clear aFocusChanged so that the
    // caret position isn't updated.
    aFocusChanged = false;
  }

  // unless it was set above, retrieve the window for the element to focus
  if (!newWindow) {
    newWindow = GetCurrentWindow(elementToFocus);
  }

  RefPtr<BrowsingContext> newBrowsingContext;
  if (newWindow) {
    newBrowsingContext = newWindow->GetBrowsingContext();
  }

  // if the element is already focused, just return. Note that this happens
  // after the frame check above so that we compare the element that will be
  // focused rather than the frame it is in.
  if (!newWindow || (newBrowsingContext == GetFocusedBrowsingContext() &&
                     elementToFocus == mFocusedElement)) {
    return Nothing();
  }

  MOZ_ASSERT(newBrowsingContext);

  BrowsingContext* browsingContextToFocus = newBrowsingContext;
  if (RefPtr<nsFrameLoaderOwner> flo = do_QueryObject(elementToFocus)) {
    // Only look at pre-existing browsing contexts. If this function is
    // called during reflow, calling GetBrowsingContext() could cause frame
    // loader initialization at a time when it isn't safe.
    if (BrowsingContext* bc = flo->GetExtantBrowsingContext()) {
      // If focus is already in the subtree rooted at bc, return early
      // to match the single-process focus semantics. Otherwise, we'd
      // blur and immediately refocus whatever is focused.
      BrowsingContext* walk = focusedBrowsingContext;
      while (walk) {
        if (walk == bc) {
          return Nothing();
        }
        walk = walk->GetParent();
      }
      browsingContextToFocus = bc;
    }
  }

  // don't allow focus to be placed in docshells or descendants of docshells
  // that are being destroyed. Also, ensure that the page hasn't been
  // unloaded. The prevents content from being refocused during an unload event.
  nsCOMPtr<nsIDocShell> newDocShell = newWindow->GetDocShell();
  nsCOMPtr<nsIDocShell> docShell = newDocShell;
  while (docShell) {
    bool inUnload;
    docShell->GetIsInUnload(&inUnload);
    if (inUnload) {
      return Nothing();
    }

    bool beingDestroyed;
    docShell->IsBeingDestroyed(&beingDestroyed);
    if (beingDestroyed) {
      return Nothing();
    }

    BrowsingContext* bc = docShell->GetBrowsingContext();

    nsCOMPtr<nsIDocShellTreeItem> parentDsti;
    docShell->GetInProcessParent(getter_AddRefs(parentDsti));
    docShell = do_QueryInterface(parentDsti);
    if (!docShell && !XRE_IsParentProcess()) {
      // We don't have an in-process parent, but let's see if we have
      // an in-process ancestor or if an out-of-process ancestor
      // is discarded.
      do {
        bc = bc->GetParent();
        if (bc && bc->IsDiscarded()) {
          return Nothing();
        }
      } while (bc && !bc->IsInProcess());
      if (bc) {
        docShell = bc->GetDocShell();
      } else {
        docShell = nullptr;
      }
    }
  }

  bool focusMovesToDifferentBC =
      (focusedBrowsingContext != browsingContextToFocus);

  if (focusedBrowsingContext && focusMovesToDifferentBC &&
      nsContentUtils::IsHandlingKeyBoardEvent() &&
      !nsContentUtils::LegacyIsCallerChromeOrNativeCode()) {
    MOZ_ASSERT(browsingContextToFocus,
               "BrowsingContext to focus should be non-null.");

    nsIPrincipal* focusedPrincipal = nullptr;
    nsIPrincipal* newPrincipal = nullptr;

    if (XRE_IsParentProcess()) {
      if (WindowGlobalParent* focusedWindowGlobalParent =
              focusedBrowsingContext->Canonical()->GetCurrentWindowGlobal()) {
        focusedPrincipal = focusedWindowGlobalParent->DocumentPrincipal();
      }

      if (WindowGlobalParent* newWindowGlobalParent =
              browsingContextToFocus->Canonical()->GetCurrentWindowGlobal()) {
        newPrincipal = newWindowGlobalParent->DocumentPrincipal();
      }
    } else if (focusedBrowsingContext->IsInProcess() &&
               browsingContextToFocus->IsInProcess()) {
      nsCOMPtr<nsIScriptObjectPrincipal> focused =
          do_QueryInterface(focusedBrowsingContext->GetDOMWindow());
      nsCOMPtr<nsIScriptObjectPrincipal> newFocus =
          do_QueryInterface(browsingContextToFocus->GetDOMWindow());
      MOZ_ASSERT(focused && newFocus,
                 "BrowsingContext should always have a window here.");
      focusedPrincipal = focused->GetPrincipal();
      newPrincipal = newFocus->GetPrincipal();
    }

    if (!focusedPrincipal || !newPrincipal) {
      return Nothing();
    }

    if (!focusedPrincipal->Subsumes(newPrincipal)) {
      NS_WARNING("Not allowed to focus the new window!");
      return Nothing();
    }
  }

  // to check if the new element is in the active window, compare the
  // new root docshell for the new element with the active window's docshell.
  RefPtr<BrowsingContext> newRootBrowsingContext = nullptr;
  bool isElementInActiveWindow = false;
  if (XRE_IsParentProcess()) {
    nsCOMPtr<nsPIDOMWindowOuter> newRootWindow = nullptr;
    nsCOMPtr<nsIDocShellTreeItem> dsti = newWindow->GetDocShell();
    if (dsti) {
      nsCOMPtr<nsIDocShellTreeItem> root;
      dsti->GetInProcessRootTreeItem(getter_AddRefs(root));
      newRootWindow = root ? root->GetWindow() : nullptr;

      isElementInActiveWindow =
          (mActiveWindow && newRootWindow == mActiveWindow);
    }
    if (newRootWindow) {
      newRootBrowsingContext = newRootWindow->GetBrowsingContext();
    }
  } else {
    // XXX This is wrong for `<iframe mozbrowser>` and for XUL
    // `<browser remote="true">`. See:
    // https://searchfox.org/mozilla-central/rev/8a63fc190b39ed6951abb4aef4a56487a43962bc/dom/base/nsFrameLoader.cpp#229-232
    newRootBrowsingContext = newBrowsingContext->Top();
    // to check if the new element is in the active window, compare the
    // new root docshell for the new element with the active window's docshell.
    isElementInActiveWindow =
        (GetActiveBrowsingContext() == newRootBrowsingContext);
  }

  // Exit fullscreen if a website focuses another window
  if (StaticPrefs::full_screen_api_exit_on_windowRaise() &&
      !isElementInActiveWindow && (aFlags & FLAG_RAISE)) {
    if (XRE_IsParentProcess()) {
      if (Document* doc = mActiveWindow ? mActiveWindow->GetDoc() : nullptr) {
        Document::ClearPendingFullscreenRequests(doc);
        if (doc->GetFullscreenElement()) {
          LogWarningFullscreenWindowRaise(mFocusedElement);
          Document::AsyncExitFullscreen(doc);
        }
      }
    } else {
      BrowsingContext* activeBrowsingContext = GetActiveBrowsingContext();
      if (activeBrowsingContext) {
        nsIDocShell* shell = activeBrowsingContext->GetDocShell();
        if (shell) {
          if (Document* doc = shell->GetDocument()) {
            Document::ClearPendingFullscreenRequests(doc);
            if (doc->GetFullscreenElement()) {
              Document::AsyncExitFullscreen(doc);
            }
          }
        } else {
          mozilla::dom::ContentChild* contentChild =
              mozilla::dom::ContentChild::GetSingleton();
          MOZ_ASSERT(contentChild);
          contentChild->SendMaybeExitFullscreen(activeBrowsingContext);
        }
      }
    }
  }

  // if the FLAG_NOSWITCHFRAME flag is used, only allow the focus to be
  // shifted away from the current element if the new shell to focus is
  // the same or an ancestor shell of the currently focused shell.
  bool allowFrameSwitch = !(aFlags & FLAG_NOSWITCHFRAME) ||
                          IsSameOrAncestor(newWindow, focusedBrowsingContext);

  // if the element is in the active window, frame switching is allowed and
  // the content is in a visible window, fire blur and focus events.
  bool sendFocusEvent =
      isElementInActiveWindow && allowFrameSwitch && IsWindowVisible(newWindow);

  // Don't allow to steal the focus from chrome nodes if the caller cannot
  // access them.
  if (sendFocusEvent && mFocusedElement &&
      mFocusedElement->OwnerDoc() != aNewContent->OwnerDoc() &&
      mFocusedElement->NodePrincipal()->IsSystemPrincipal() &&
      !nsContentUtils::LegacyIsCallerNativeCode() &&
      !nsContentUtils::CanCallerAccess(mFocusedElement)) {
    sendFocusEvent = false;
  }

  LOGCONTENT("Shift Focus: %s", elementToFocus.get());
  LOGFOCUS((" Flags: %x Current Window: %p New Window: %p Current Element: %p",
            aFlags, mFocusedWindow.get(), newWindow.get(),
            mFocusedElement.get()));
  const uint64_t actionId = GenerateFocusActionId();
  LOGFOCUS(
      (" In Active Window: %d Moves to different BrowsingContext: %d "
       "SendFocus: %d actionid: %" PRIu64,
       isElementInActiveWindow, focusMovesToDifferentBC, sendFocusEvent,
       actionId));

  if (sendFocusEvent) {
    Maybe<BlurredElementInfo> blurredInfo;
    if (mFocusedElement) {
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