Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 706 insertions, 0 deletions

diff --git a/accessible/generic/RootAccessible.cpp b/accessible/generic/RootAccessible.cpp
new file mode 100644
index 0000000000..aea5d4c84c
--- /dev/null
+++ b/accessible/generic/RootAccessible.cpp
@@ -0,0 +1,706 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "RootAccessible.h"
+
+#include "mozilla/ArrayUtils.h"
+#include "nsXULPopupManager.h"
+
+#define CreateEvent CreateEventA
+
+#include "LocalAccessible-inl.h"
+#include "DocAccessible-inl.h"
+#include "mozilla/a11y/DocAccessibleParent.h"
+#include "nsAccessibilityService.h"
+#include "nsAccUtils.h"
+#include "nsCoreUtils.h"
+#include "nsEventShell.h"
+#include "Relation.h"
+#include "mozilla/a11y/Role.h"
+#include "States.h"
+#include "XULTreeAccessible.h"
+
+#include "mozilla/dom/BindingUtils.h"
+#include "mozilla/dom/CustomEvent.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/ScriptSettings.h"
+#include "mozilla/dom/BrowserHost.h"
+
+#include "nsIDocShellTreeOwner.h"
+#include "mozilla/dom/Event.h"
+#include "mozilla/dom/EventTarget.h"
+#include "nsIDOMXULMultSelectCntrlEl.h"
+#include "mozilla/dom/Document.h"
+#include "nsIInterfaceRequestorUtils.h"
+#include "nsIPropertyBag2.h"
+#include "nsPIDOMWindow.h"
+#include "nsIWebBrowserChrome.h"
+#include "nsFocusManager.h"
+
+#include "nsIAppWindow.h"
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+using namespace mozilla::dom;
+
+////////////////////////////////////////////////////////////////////////////////
+// nsISupports
+
+NS_IMPL_ISUPPORTS_INHERITED(RootAccessible, DocAccessible, nsIDOMEventListener)
+
+////////////////////////////////////////////////////////////////////////////////
+// Constructor/destructor
+
+RootAccessible::RootAccessible(Document* aDocument, PresShell* aPresShell)
+    : DocAccessibleWrap(aDocument, aPresShell) {
+  mType = eRootType;
+}
+
+RootAccessible::~RootAccessible() {}
+
+////////////////////////////////////////////////////////////////////////////////
+// LocalAccessible
+
+ENameValueFlag RootAccessible::Name(nsString& aName) const {
+  aName.Truncate();
+
+  if (ARIARoleMap()) {
+    LocalAccessible::Name(aName);
+    if (!aName.IsEmpty()) return eNameOK;
+  }
+
+  mDocumentNode->GetTitle(aName);
+  return eNameOK;
+}
+
+// RootAccessible protected member
+uint32_t RootAccessible::GetChromeFlags() const {
+  // Return the flag set for the top level window as defined
+  // by nsIWebBrowserChrome::CHROME_WINDOW_[FLAGNAME]
+  // Not simple: nsIAppWindow is not just a QI from nsIDOMWindow
+  nsCOMPtr<nsIDocShell> docShell = nsCoreUtils::GetDocShellFor(mDocumentNode);
+  NS_ENSURE_TRUE(docShell, 0);
+  nsCOMPtr<nsIDocShellTreeOwner> treeOwner;
+  docShell->GetTreeOwner(getter_AddRefs(treeOwner));
+  NS_ENSURE_TRUE(treeOwner, 0);
+  nsCOMPtr<nsIAppWindow> appWin(do_GetInterface(treeOwner));
+  if (!appWin) {
+    return 0;
+  }
+  uint32_t chromeFlags;
+  appWin->GetChromeFlags(&chromeFlags);
+  return chromeFlags;
+}
+
+uint64_t RootAccessible::NativeState() const {
+  uint64_t state = DocAccessibleWrap::NativeState();
+  if (state & states::DEFUNCT) return state;
+
+  uint32_t chromeFlags = GetChromeFlags();
+  if (chromeFlags & nsIWebBrowserChrome::CHROME_WINDOW_RESIZE) {
+    state |= states::SIZEABLE;
+  }
+  // If it has a titlebar it's movable
+  // XXX unless it's minimized or maximized, but not sure
+  //     how to detect that
+  if (chromeFlags & nsIWebBrowserChrome::CHROME_TITLEBAR) {
+    state |= states::MOVEABLE;
+  }
+  if (chromeFlags & nsIWebBrowserChrome::CHROME_MODAL) state |= states::MODAL;
+
+  nsFocusManager* fm = nsFocusManager::GetFocusManager();
+  if (fm && fm->GetActiveWindow() == mDocumentNode->GetWindow()) {
+    state |= states::ACTIVE;
+  }
+
+  return state;
+}
+
+const char* const kEventTypes[] = {
+#ifdef DEBUG_DRAGDROPSTART
+    // Capture mouse over events and fire fake DRAGDROPSTART event to simplify
+    // debugging a11y objects with event viewers.
+    "mouseover",
+#endif
+    // Fired when list or tree selection changes.
+    "select",
+    // Fired when value changes immediately, wether or not focused changed.
+    "ValueChange", "AlertActive", "TreeRowCountChanged", "TreeInvalidated",
+    // add ourself as a OpenStateChange listener (custom event fired in
+    // tree.xml)
+    "OpenStateChange",
+    // add ourself as a CheckboxStateChange listener (custom event fired in
+    // HTMLInputElement.cpp)
+    "CheckboxStateChange",
+    // add ourself as a RadioStateChange Listener (custom event fired in in
+    // HTMLInputElement.cpp & radio.js)
+    "RadioStateChange", "popupshown", "popuphiding", "DOMMenuInactive",
+    "DOMMenuItemActive", "DOMMenuItemInactive", "DOMMenuBarActive",
+    "DOMMenuBarInactive", "scroll", "DOMTitleChanged"};
+
+nsresult RootAccessible::AddEventListeners() {
+  // EventTarget interface allows to register event listeners to
+  // receive untrusted events (synthetic events generated by untrusted code).
+  // For example, XBL bindings implementations for elements that are hosted in
+  // non chrome document fire untrusted events.
+  // We must use the window's parent target in order to receive events from
+  // iframes and shadow DOM; e.g. ValueChange events from a <select> in an
+  // iframe or shadow DOM. The root document itself doesn't receive these.
+  nsPIDOMWindowOuter* window = mDocumentNode->GetWindow();
+  nsCOMPtr<EventTarget> nstarget = window ? window->GetParentTarget() : nullptr;
+
+  if (nstarget) {
+    for (const char *const *e = kEventTypes, *const *e_end =
+                                                 ArrayEnd(kEventTypes);
+         e < e_end; ++e) {
+      nsresult rv = nstarget->AddEventListener(NS_ConvertASCIItoUTF16(*e), this,
+                                               true, true);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+  }
+
+  return DocAccessible::AddEventListeners();
+}
+
+nsresult RootAccessible::RemoveEventListeners() {
+  nsPIDOMWindowOuter* window = mDocumentNode->GetWindow();
+  nsCOMPtr<EventTarget> target = window ? window->GetParentTarget() : nullptr;
+  if (target) {
+    for (const char *const *e = kEventTypes, *const *e_end =
+                                                 ArrayEnd(kEventTypes);
+         e < e_end; ++e) {
+      target->RemoveEventListener(NS_ConvertASCIItoUTF16(*e), this, true);
+    }
+  }
+
+  // Do this before removing clearing caret accessible, so that it can use
+  // shutdown the caret accessible's selection listener
+  DocAccessible::RemoveEventListeners();
+  return NS_OK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// public
+
+void RootAccessible::DocumentActivated(DocAccessible* aDocument) {}
+
+////////////////////////////////////////////////////////////////////////////////
+// nsIDOMEventListener
+
+NS_IMETHODIMP
+RootAccessible::HandleEvent(Event* aDOMEvent) {
+  MOZ_ASSERT(aDOMEvent);
+  if (IsDefunct()) {
+    // Even though we've been shut down, RemoveEventListeners might not have
+    // removed the event handlers on the window's parent target if GetWindow
+    // returned null, so we might still get events here in this case. We should
+    // just ignore these events.
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsINode> origTargetNode =
+      do_QueryInterface(aDOMEvent->GetOriginalTarget());
+  if (!origTargetNode) return NS_OK;
+
+#ifdef A11Y_LOG
+  if (logging::IsEnabled(logging::eDOMEvents)) {
+    nsAutoString eventType;
+    aDOMEvent->GetType(eventType);
+    logging::DOMEvent("handled", origTargetNode, eventType);
+  }
+#endif
+
+  DocAccessible* document =
+      GetAccService()->GetDocAccessible(origTargetNode->OwnerDoc());
+
+  if (document) {
+    nsAutoString eventType;
+    aDOMEvent->GetType(eventType);
+    if (eventType.EqualsLiteral("scroll")) {
+      // We don't put this in the notification queue for 2 reasons:
+      // 1. We will flood the queue with repetitive events.
+      // 2. Since this doesn't necessarily touch layout, we are not
+      //    guaranteed to have a WillRefresh tick any time soon.
+      document->HandleScroll(origTargetNode);
+    } else {
+      // Root accessible exists longer than any of its descendant documents so
+      // that we are guaranteed notification is processed before root accessible
+      // is destroyed.
+      // For shadow DOM, GetOriginalTarget on the Event returns null if we
+      // process the event async, so we must pass the target node as well.
+      document->HandleNotification<RootAccessible, Event, nsINode>(
+          this, &RootAccessible::ProcessDOMEvent, aDOMEvent, origTargetNode);
+    }
+  }
+
+  return NS_OK;
+}
+
+// RootAccessible protected
+void RootAccessible::ProcessDOMEvent(Event* aDOMEvent, nsINode* aTarget) {
+  MOZ_ASSERT(aDOMEvent);
+  MOZ_ASSERT(aTarget);
+
+  nsAutoString eventType;
+  aDOMEvent->GetType(eventType);
+
+#ifdef A11Y_LOG
+  if (logging::IsEnabled(logging::eDOMEvents)) {
+    logging::DOMEvent("processed", aTarget, eventType);
+  }
+#endif
+
+  if (eventType.EqualsLiteral("popuphiding")) {
+    HandlePopupHidingEvent(aTarget);
+    return;
+  }
+
+  DocAccessible* targetDocument =
+      GetAccService()->GetDocAccessible(aTarget->OwnerDoc());
+  if (!targetDocument) {
+    // Document has ceased to exist.
+    return;
+  }
+
+  if (eventType.EqualsLiteral("popupshown") &&
+      aTarget->IsAnyOfXULElements(nsGkAtoms::tooltip, nsGkAtoms::panel)) {
+    targetDocument->ContentInserted(aTarget->AsContent(),
+                                    aTarget->GetNextSibling());
+    return;
+  }
+
+  LocalAccessible* accessible =
+      targetDocument->GetAccessibleOrContainer(aTarget);
+  if (!accessible) return;
+
+  if (accessible->IsDoc() && eventType.EqualsLiteral("DOMTitleChanged")) {
+    targetDocument->FireDelayedEvent(nsIAccessibleEvent::EVENT_NAME_CHANGE,
+                                     accessible);
+    return;
+  }
+
+  XULTreeAccessible* treeAcc = accessible->AsXULTree();
+  if (treeAcc) {
+    if (eventType.EqualsLiteral("TreeRowCountChanged")) {
+      HandleTreeRowCountChangedEvent(aDOMEvent, treeAcc);
+      return;
+    }
+
+    if (eventType.EqualsLiteral("TreeInvalidated")) {
+      HandleTreeInvalidatedEvent(aDOMEvent, treeAcc);
+      return;
+    }
+  }
+
+  if (eventType.EqualsLiteral("RadioStateChange")) {
+    uint64_t state = accessible->State();
+    bool isEnabled = (state & (states::CHECKED | states::SELECTED)) != 0;
+
+    if (accessible->NeedsDOMUIEvent()) {
+      RefPtr<AccEvent> accEvent =
+          new AccStateChangeEvent(accessible, states::CHECKED, isEnabled);
+      nsEventShell::FireEvent(accEvent);
+    }
+
+    if (isEnabled) {
+      FocusMgr()->ActiveItemChanged(accessible);
+#ifdef A11Y_LOG
+      if (logging::IsEnabled(logging::eFocus)) {
+        logging::ActiveItemChangeCausedBy("RadioStateChange", accessible);
+      }
+#endif
+    }
+
+    return;
+  }
+
+  if (eventType.EqualsLiteral("CheckboxStateChange")) {
+    if (accessible->NeedsDOMUIEvent()) {
+      uint64_t state = accessible->State();
+      bool isEnabled = !!(state & states::CHECKED);
+
+      RefPtr<AccEvent> accEvent =
+          new AccStateChangeEvent(accessible, states::CHECKED, isEnabled);
+      nsEventShell::FireEvent(accEvent);
+    }
+    return;
+  }
+
+  LocalAccessible* treeItemAcc = nullptr;
+  // If it's a tree element, need the currently selected item.
+  if (treeAcc) {
+    treeItemAcc = accessible->CurrentItem();
+    if (treeItemAcc) accessible = treeItemAcc;
+  }
+
+  if (treeItemAcc && eventType.EqualsLiteral("OpenStateChange")) {
+    uint64_t state = accessible->State();
+    bool isEnabled = (state & states::EXPANDED) != 0;
+
+    RefPtr<AccEvent> accEvent =
+        new AccStateChangeEvent(accessible, states::EXPANDED, isEnabled);
+    nsEventShell::FireEvent(accEvent);
+    return;
+  }
+
+  nsINode* targetNode = accessible->GetNode();
+  if (treeItemAcc && eventType.EqualsLiteral("select")) {
+    // XXX: We shouldn't be based on DOM select event which doesn't provide us
+    // any context info. We should integrate into nsTreeSelection instead.
+    // If multiselect tree, we should fire selectionadd or selection removed
+    if (FocusMgr()->HasDOMFocus(targetNode)) {
+      nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSel =
+          targetNode->AsElement()->AsXULMultiSelectControl();
+      if (!multiSel) {
+        // This shouldn't be possible. All XUL trees should have
+        // nsIDOMXULMultiSelectControlElement, and the tree is focused, so it
+        // shouldn't be dying. Nevertheless, this sometimes happens in the wild
+        // (bug 1597043).
+        MOZ_ASSERT_UNREACHABLE(
+            "XUL tree doesn't have nsIDOMXULMultiSelectControlElement");
+        return;
+      }
+      nsAutoString selType;
+      multiSel->GetSelType(selType);
+      if (selType.IsEmpty() || !selType.EqualsLiteral("single")) {
+        // XXX: We need to fire EVENT_SELECTION_ADD and EVENT_SELECTION_REMOVE
+        // for each tree item. Perhaps each tree item will need to cache its
+        // selection state and fire an event after a DOM "select" event when
+        // that state changes. XULTreeAccessible::UpdateTreeSelection();
+        nsEventShell::FireEvent(nsIAccessibleEvent::EVENT_SELECTION_WITHIN,
+                                accessible);
+        return;
+      }
+
+      RefPtr<AccSelChangeEvent> selChangeEvent = new AccSelChangeEvent(
+          treeAcc, treeItemAcc, AccSelChangeEvent::eSelectionAdd);
+      nsEventShell::FireEvent(selChangeEvent);
+      return;
+    }
+  } else if (eventType.EqualsLiteral("AlertActive")) {
+    nsEventShell::FireEvent(nsIAccessibleEvent::EVENT_ALERT, accessible);
+  } else if (eventType.EqualsLiteral("popupshown")) {
+    HandlePopupShownEvent(accessible);
+  } else if (eventType.EqualsLiteral("DOMMenuInactive")) {
+    if (accessible->Role() == roles::MENUPOPUP) {
+      nsEventShell::FireEvent(nsIAccessibleEvent::EVENT_MENUPOPUP_END,
+                              accessible);
+    }
+    if (auto* focus = FocusMgr()->FocusedLocalAccessible()) {
+      // Intentionally use the content tree, because Linux strips menupopups
+      // from the a11y tree so accessible might be an arbitrary ancestor.
+      if (focus->GetContent() &&
+          focus->GetContent()->IsShadowIncludingInclusiveDescendantOf(
+              aTarget)) {
+        // Move the focus to the topmost menu active content if any. The
+        // menu item in the parent menu will not fire a DOMMenuItemActive
+        // event if it's already active.
+        LocalAccessible* newActiveAccessible = nullptr;
+        if (auto* pm = nsXULPopupManager::GetInstance()) {
+          if (auto* content = pm->GetTopActiveMenuItemContent()) {
+            newActiveAccessible =
+                accessible->Document()->GetAccessible(content);
+          }
+        }
+        FocusMgr()->ActiveItemChanged(newActiveAccessible);
+#ifdef A11Y_LOG
+        if (logging::IsEnabled(logging::eFocus)) {
+          logging::ActiveItemChangeCausedBy("DOMMenuInactive",
+                                            newActiveAccessible);
+        }
+#endif
+      }
+    }
+  } else if (eventType.EqualsLiteral("DOMMenuItemActive")) {
+    RefPtr<AccEvent> event =
+        new AccStateChangeEvent(accessible, states::ACTIVE, true);
+    nsEventShell::FireEvent(event);
+    FocusMgr()->ActiveItemChanged(accessible);
+#ifdef A11Y_LOG
+    if (logging::IsEnabled(logging::eFocus)) {
+      logging::ActiveItemChangeCausedBy("DOMMenuItemActive", accessible);
+    }
+#endif
+  } else if (eventType.EqualsLiteral("DOMMenuItemInactive")) {
+    RefPtr<AccEvent> event =
+        new AccStateChangeEvent(accessible, states::ACTIVE, false);
+    nsEventShell::FireEvent(event);
+
+    // Process DOMMenuItemInactive event for autocomplete only because this is
+    // unique widget that may acquire focus from autocomplete popup while popup
+    // stays open and has no active item. In case of XUL tree autocomplete
+    // popup this event is fired for tree accessible.
+    LocalAccessible* widget =
+        accessible->IsWidget() ? accessible : accessible->ContainerWidget();
+    if (widget && widget->IsAutoCompletePopup()) {
+      FocusMgr()->ActiveItemChanged(nullptr);
+#ifdef A11Y_LOG
+      if (logging::IsEnabled(logging::eFocus)) {
+        logging::ActiveItemChangeCausedBy("DOMMenuItemInactive", accessible);
+      }
+#endif
+    }
+  } else if (eventType.EqualsLiteral(
+                 "DOMMenuBarActive")) {  // Always from user input
+    nsEventShell::FireEvent(nsIAccessibleEvent::EVENT_MENU_START, accessible,
+                            eFromUserInput);
+
+    // Notify of active item change when menubar gets active and if it has
+    // current item. This is a case of mouseover (set current menuitem) and
+    // mouse click (activate the menubar). If menubar doesn't have current item
+    // (can be a case of menubar activation from keyboard) then ignore this
+    // notification because later we'll receive DOMMenuItemActive event after
+    // current menuitem is set.
+    LocalAccessible* activeItem = accessible->CurrentItem();
+    if (activeItem) {
+      FocusMgr()->ActiveItemChanged(activeItem);
+#ifdef A11Y_LOG
+      if (logging::IsEnabled(logging::eFocus)) {
+        logging::ActiveItemChangeCausedBy("DOMMenuBarActive", accessible);
+      }
+#endif
+    }
+  } else if (eventType.EqualsLiteral(
+                 "DOMMenuBarInactive")) {  // Always from user input
+    nsEventShell::FireEvent(nsIAccessibleEvent::EVENT_MENU_END, accessible,
+                            eFromUserInput);
+
+    FocusMgr()->ActiveItemChanged(nullptr);
+#ifdef A11Y_LOG
+    if (logging::IsEnabled(logging::eFocus)) {
+      logging::ActiveItemChangeCausedBy("DOMMenuBarInactive", accessible);
+    }
+#endif
+  } else if (accessible->NeedsDOMUIEvent() &&
+             eventType.EqualsLiteral("ValueChange")) {
+    uint32_t event = accessible->HasNumericValue()
+                         ? nsIAccessibleEvent::EVENT_VALUE_CHANGE
+                         : nsIAccessibleEvent::EVENT_TEXT_VALUE_CHANGE;
+    targetDocument->FireDelayedEvent(event, accessible);
+  }
+#ifdef DEBUG_DRAGDROPSTART
+  else if (eventType.EqualsLiteral("mouseover")) {
+    nsEventShell::FireEvent(nsIAccessibleEvent::EVENT_DRAGDROP_START,
+                            accessible);
+  }
+#endif
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// LocalAccessible
+
+void RootAccessible::Shutdown() {
+  // Called manually or by LocalAccessible::LastRelease()
+  if (HasShutdown()) {
+    return;
+  }
+  DocAccessibleWrap::Shutdown();
+}
+
+Relation RootAccessible::RelationByType(RelationType aType) const {
+  if (!mDocumentNode || aType != RelationType::EMBEDS) {
+    return DocAccessibleWrap::RelationByType(aType);
+  }
+
+  if (RemoteAccessible* remoteDoc = GetPrimaryRemoteTopLevelContentDoc()) {
+    return Relation(remoteDoc);
+  }
+
+  if (nsIDocShell* docShell = mDocumentNode->GetDocShell()) {
+    nsCOMPtr<nsIDocShellTreeOwner> owner;
+    docShell->GetTreeOwner(getter_AddRefs(owner));
+    if (owner) {
+      nsCOMPtr<nsIDocShellTreeItem> contentShell;
+      owner->GetPrimaryContentShell(getter_AddRefs(contentShell));
+      if (contentShell) {
+        return Relation(nsAccUtils::GetDocAccessibleFor(contentShell));
+      }
+    }
+  }
+
+  return Relation();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Protected members
+
+void RootAccessible::HandlePopupShownEvent(LocalAccessible* aAccessible) {
+  roles::Role role = aAccessible->Role();
+
+  if (role == roles::MENUPOPUP) {
+    // Don't fire menupopup events for combobox and autocomplete lists.
+    nsEventShell::FireEvent(nsIAccessibleEvent::EVENT_MENUPOPUP_START,
+                            aAccessible);
+    return;
+  }
+
+  if (role == roles::COMBOBOX_LIST) {
+    // Fire expanded state change event for comboboxes and autocompeletes.
+    LocalAccessible* combobox = aAccessible->LocalParent();
+    if (!combobox) return;
+
+    if (combobox->IsCombobox()) {
+      RefPtr<AccEvent> event =
+          new AccStateChangeEvent(combobox, states::EXPANDED, true);
+      nsEventShell::FireEvent(event);
+    }
+
+    // If aria-activedescendant is present, redirect focus.
+    // This is needed for parent process <select> dropdowns, which use a
+    // menulist containing div elements instead of XUL menuitems. XUL menuitems
+    // fire DOMMenuItemActive events from layout instead.
+    MOZ_ASSERT(aAccessible->Elm());
+    if (aAccessible->Elm()->HasAttr(nsGkAtoms::aria_activedescendant)) {
+      LocalAccessible* activeDescendant = aAccessible->CurrentItem();
+      if (activeDescendant) {
+        FocusMgr()->ActiveItemChanged(activeDescendant, false);
+#ifdef A11Y_LOG
+        if (logging::IsEnabled(logging::eFocus)) {
+          logging::ActiveItemChangeCausedBy("ARIA activedescendant on popup",
+                                            activeDescendant);
+        }
+#endif
+      }
+    }
+  }
+}
+
+void RootAccessible::HandlePopupHidingEvent(nsINode* aPopupNode) {
+  DocAccessible* document = nsAccUtils::GetDocAccessibleFor(aPopupNode);
+  if (!document) {
+    return;
+  }
+
+  if (aPopupNode->IsAnyOfXULElements(nsGkAtoms::tooltip, nsGkAtoms::panel)) {
+    document->ContentRemoved(aPopupNode->AsContent());
+    return;
+  }
+
+  // Get popup accessible. There are cases when popup element isn't accessible
+  // but an underlying widget is and behaves like popup, an example is
+  // autocomplete popups.
+  LocalAccessible* popup = document->GetAccessible(aPopupNode);
+  if (!popup) {
+    LocalAccessible* popupContainer =
+        document->GetContainerAccessible(aPopupNode);
+    if (!popupContainer) {
+      return;
+    }
+
+    uint32_t childCount = popupContainer->ChildCount();
+    for (uint32_t idx = 0; idx < childCount; idx++) {
+      LocalAccessible* child = popupContainer->LocalChildAt(idx);
+      if (child->IsAutoCompletePopup()) {
+        popup = child;
+        break;
+      }
+    }
+
+    // No popup no events. Focus is managed by DOM. This is a case for
+    // menupopups of menus on Linux since there are no accessible for popups.
+    if (!popup) {
+      return;
+    }
+  }
+
+  // In case of autocompletes and comboboxes fire state change event for
+  // expanded state. Note, HTML form autocomplete isn't a subject of state
+  // change event because they aren't autocompletes strictly speaking.
+
+  // HTML select is target of popuphidding event. Otherwise get container
+  // widget. No container widget means this is either tooltip or menupopup.
+  // No events in the former case.
+  LocalAccessible* widget = nullptr;
+  if (popup->IsCombobox()) {
+    widget = popup;
+  } else {
+    widget = popup->ContainerWidget();
+    if (!widget) {
+      if (!popup->IsMenuPopup()) {
+        return;
+      }
+      widget = popup;
+    }
+  }
+
+  // Fire expanded state change event.
+  if (widget->IsCombobox()) {
+    RefPtr<AccEvent> event =
+        new AccStateChangeEvent(widget, states::EXPANDED, false);
+    document->FireDelayedEvent(event);
+  }
+}
+
+static void GetPropertyBagFromEvent(Event* aEvent,
+                                    nsIPropertyBag2** aPropertyBag) {
+  *aPropertyBag = nullptr;
+
+  CustomEvent* customEvent = aEvent->AsCustomEvent();
+  if (!customEvent) return;
+
+  AutoJSAPI jsapi;
+  if (!jsapi.Init(customEvent->GetParentObject())) return;
+
+  JSContext* cx = jsapi.cx();
+  JS::Rooted<JS::Value> detail(cx);
+  customEvent->GetDetail(cx, &detail);
+  if (!detail.isObject()) return;
+
+  JS::Rooted<JSObject*> detailObj(cx, &detail.toObject());
+
+  nsresult rv;
+  nsCOMPtr<nsIPropertyBag2> propBag;
+  rv = UnwrapArg<nsIPropertyBag2>(cx, detailObj, getter_AddRefs(propBag));
+  if (NS_FAILED(rv)) return;
+
+  propBag.forget(aPropertyBag);
+}
+
+void RootAccessible::HandleTreeRowCountChangedEvent(
+    Event* aEvent, XULTreeAccessible* aAccessible) {
+  nsCOMPtr<nsIPropertyBag2> propBag;
+  GetPropertyBagFromEvent(aEvent, getter_AddRefs(propBag));
+  if (!propBag) return;
+
+  nsresult rv;
+  int32_t index, count;
+  rv = propBag->GetPropertyAsInt32(u"index"_ns, &index);
+  if (NS_FAILED(rv)) return;
+
+  rv = propBag->GetPropertyAsInt32(u"count"_ns, &count);
+  if (NS_FAILED(rv)) return;
+
+  aAccessible->InvalidateCache(index, count);
+}
+
+void RootAccessible::HandleTreeInvalidatedEvent(
+    Event* aEvent, XULTreeAccessible* aAccessible) {
+  nsCOMPtr<nsIPropertyBag2> propBag;
+  GetPropertyBagFromEvent(aEvent, getter_AddRefs(propBag));
+  if (!propBag) return;
+
+  int32_t startRow = 0, endRow = -1, startCol = 0, endCol = -1;
+  propBag->GetPropertyAsInt32(u"startrow"_ns, &startRow);
+  propBag->GetPropertyAsInt32(u"endrow"_ns, &endRow);
+  propBag->GetPropertyAsInt32(u"startcolumn"_ns, &startCol);
+  propBag->GetPropertyAsInt32(u"endcolumn"_ns, &endCol);
+
+  aAccessible->TreeViewInvalidated(startRow, endRow, startCol, endCol);
+}
+
+RemoteAccessible* RootAccessible::GetPrimaryRemoteTopLevelContentDoc() const {
+  nsCOMPtr<nsIDocShellTreeOwner> owner;
+  mDocumentNode->GetDocShell()->GetTreeOwner(getter_AddRefs(owner));
+  NS_ENSURE_TRUE(owner, nullptr);
+
+  nsCOMPtr<nsIRemoteTab> remoteTab;
+  owner->GetPrimaryRemoteTab(getter_AddRefs(remoteTab));
+  if (!remoteTab) {
+    return nullptr;
+  }
+
+  auto tab = static_cast<dom::BrowserHost*>(remoteTab.get());
+  return tab->GetTopLevelDocAccessible();
+}