Issue MoonchildProductions/UXP#1578 - Add global menubar support for GTK

1 files changed, 800 insertions, 0 deletions

diff --git a/widget/gtk/nsMenu.cpp b/widget/gtk/nsMenu.cpp
new file mode 100644
index 000000000..073a4acf6
--- /dev/null
+++ b/widget/gtk/nsMenu.cpp
@@ -0,0 +1,800 @@
+/* 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/. */
+
+#define _IMPL_NS_LAYOUT
+
+#include "mozilla/dom/Element.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/GuardObjects.h"
+#include "mozilla/MouseEvents.h"
+#include "mozilla/Move.h"
+#include "mozilla/StyleSetHandleInlines.h"
+#include "nsAutoPtr.h"
+#include "nsBindingManager.h"
+#include "nsComponentManagerUtils.h"
+#include "nsContentUtils.h"
+#include "nsCSSValue.h"
+#include "nsGkAtoms.h"
+#include "nsGtkUtils.h"
+#include "nsIAtom.h"
+#include "nsIContent.h"
+#include "nsIDocument.h"
+#include "nsIPresShell.h"
+#include "nsIRunnable.h"
+#include "nsITimer.h"
+#include "nsString.h"
+#include "nsStyleContext.h"
+#include "nsStyleSet.h"
+#include "nsStyleStruct.h"
+#include "nsThreadUtils.h"
+#include "nsXBLBinding.h"
+#include "nsXBLService.h"
+
+#include "nsNativeMenuAtoms.h"
+#include "nsNativeMenuDocListener.h"
+
+#include <glib-object.h>
+
+#include "nsMenu.h"
+
+using namespace mozilla;
+
+class nsMenuContentInsertedEvent : public Runnable {
+public:
+    nsMenuContentInsertedEvent(nsMenu* aMenu,
+                               nsIContent* aContainer,
+                               nsIContent* aChild,
+                               nsIContent* aPrevSibling) :
+        mWeakMenu(aMenu),
+        mContainer(aContainer),
+        mChild(aChild),
+        mPrevSibling(aPrevSibling) { }
+
+    NS_IMETHODIMP Run() {
+        if (!mWeakMenu) {
+            return NS_OK;
+        }
+
+        static_cast<nsMenu *>(mWeakMenu.get())->HandleContentInserted(mContainer,
+                                                                      mChild,
+                                                                      mPrevSibling);
+        return NS_OK;
+    }
+
+private:
+    nsWeakMenuObject mWeakMenu;
+
+    nsCOMPtr<nsIContent> mContainer;
+    nsCOMPtr<nsIContent> mChild;
+    nsCOMPtr<nsIContent> mPrevSibling;
+};
+
+class nsMenuContentRemovedEvent : public Runnable {
+public:
+    nsMenuContentRemovedEvent(nsMenu* aMenu,
+                              nsIContent* aContainer,
+                              nsIContent* aChild) :
+        mWeakMenu(aMenu),
+        mContainer(aContainer),
+        mChild(aChild) { }
+
+    NS_IMETHODIMP Run() {
+        if (!mWeakMenu) {
+            return NS_OK;
+        }
+
+        static_cast<nsMenu *>(mWeakMenu.get())->HandleContentRemoved(mContainer,
+                                                                     mChild);
+        return NS_OK;
+    }
+
+private:
+    nsWeakMenuObject mWeakMenu;
+
+    nsCOMPtr<nsIContent> mContainer;
+    nsCOMPtr<nsIContent> mChild;
+};
+
+static void
+DispatchMouseEvent(nsIContent* aTarget, mozilla::EventMessage aMsg) {
+    if (!aTarget) {
+        return;
+    }
+
+    WidgetMouseEvent event(true, aMsg, nullptr, WidgetMouseEvent::eReal);
+    aTarget->DispatchDOMEvent(&event, nullptr, nullptr, nullptr);
+}
+
+static void
+AttachXBLBindings(nsIContent* aContent) {
+    nsIDocument* doc = aContent->OwnerDoc();
+    nsIPresShell* shell = doc->GetShell();
+    if (!shell) {
+        return;
+    }
+
+    RefPtr<nsStyleContext> sc =
+        shell->StyleSet()->AsGecko()->ResolveStyleFor(aContent->AsElement(),
+                                                      nullptr);
+    if (!sc) {
+        return;
+    }
+
+    const nsStyleDisplay* display = sc->StyleDisplay();
+    if (!display->mBinding) {
+        return;
+    }
+
+    nsXBLService* xbl = nsXBLService::GetInstance();
+    if (!xbl) {
+        return;
+    }
+
+    RefPtr<nsXBLBinding> binding;
+    bool dummy;
+    nsresult rv = xbl->LoadBindings(aContent, display->mBinding->GetURI(),
+                                    display->mBinding->mOriginPrincipal,
+                                    getter_AddRefs(binding), &dummy);
+    if ((NS_FAILED(rv) && rv != NS_ERROR_XBL_BLOCKED) || !binding) {
+        return;
+    }
+
+    doc->BindingManager()->AddToAttachedQueue(binding);
+}
+
+void
+nsMenu::SetPopupState(EPopupState aState) {
+    mPopupState = aState;
+
+    if (!mPopupContent) {
+        return;
+    }
+
+    nsAutoString state;
+    switch (aState) {
+        case ePopupState_Showing:
+            state.Assign(NS_LITERAL_STRING("showing"));
+            break;
+        case ePopupState_Open:
+            state.Assign(NS_LITERAL_STRING("open"));
+            break;
+        case ePopupState_Hiding:
+            state.Assign(NS_LITERAL_STRING("hiding"));
+            break;
+        default:
+            break;
+    }
+
+    if (state.IsEmpty()) {
+        mPopupContent->UnsetAttr(kNameSpaceID_None,
+                                 nsNativeMenuAtoms::_moz_nativemenupopupstate,
+                                 false);
+    } else {
+        mPopupContent->SetAttr(kNameSpaceID_None,
+                               nsNativeMenuAtoms::_moz_nativemenupopupstate,
+                               state, false);
+    }
+}
+
+/* static */ void
+nsMenu::DoOpenCallback(nsITimer* aTimer, void* aClosure) {
+    nsMenu* self = static_cast<nsMenu *>(aClosure);
+
+    dbusmenu_menuitem_show_to_user(self->GetNativeData(), 0);
+
+    self->mOpenDelayTimer = nullptr;
+}
+
+/* static */ void
+nsMenu::menu_event_cb(DbusmenuMenuitem* menu,
+                      const gchar* name,
+                      GVariant* value,
+                      guint timestamp,
+                      gpointer user_data) {
+    nsMenu* self = static_cast<nsMenu *>(user_data);
+
+    nsAutoCString event(name);
+
+    if (event.Equals(NS_LITERAL_CSTRING("closed"))) {
+        self->OnClose();
+        return;
+    }
+
+    if (event.Equals(NS_LITERAL_CSTRING("opened"))) {
+        self->OnOpen();
+        return;
+    }
+}
+
+void
+nsMenu::MaybeAddPlaceholderItem() {
+    MOZ_ASSERT(!IsInBatchedUpdate(),
+               "Shouldn't be modifying the native menu structure now");
+
+    GList* children = dbusmenu_menuitem_get_children(GetNativeData());
+    if (!children) {
+        MOZ_ASSERT(!mPlaceholderItem);
+
+        mPlaceholderItem = dbusmenu_menuitem_new();
+        if (!mPlaceholderItem) {
+            return;
+        }
+
+        dbusmenu_menuitem_property_set_bool(mPlaceholderItem,
+                                            DBUSMENU_MENUITEM_PROP_VISIBLE,
+                                            false);
+
+        MOZ_ALWAYS_TRUE(
+            dbusmenu_menuitem_child_append(GetNativeData(), mPlaceholderItem));
+    }
+}
+
+void
+nsMenu::EnsureNoPlaceholderItem() {
+    MOZ_ASSERT(!IsInBatchedUpdate(),
+               "Shouldn't be modifying the native menu structure now");
+
+    if (!mPlaceholderItem) {
+        return;
+    }
+
+    MOZ_ALWAYS_TRUE(
+        dbusmenu_menuitem_child_delete(GetNativeData(), mPlaceholderItem));
+    MOZ_ASSERT(!dbusmenu_menuitem_get_children(GetNativeData()));
+
+    g_object_unref(mPlaceholderItem);
+    mPlaceholderItem = nullptr;
+}
+
+void
+nsMenu::OnOpen() {
+    if (mNeedsRebuild) {
+        Build();
+    }
+
+    nsWeakMenuObject self(this);
+    nsCOMPtr<nsIContent> origPopupContent(mPopupContent);
+    {
+        nsNativeMenuDocListener::BlockUpdatesScope updatesBlocker;
+
+        SetPopupState(ePopupState_Showing);
+        DispatchMouseEvent(mPopupContent, eXULPopupShowing);
+
+        ContentNode()->SetAttr(kNameSpaceID_None, nsGkAtoms::open,
+                               NS_LITERAL_STRING("true"), true);
+    }
+
+    if (!self) {
+        // We were deleted!
+        return;
+    }
+
+    // I guess that the popup could have changed
+    if (origPopupContent != mPopupContent) {
+        return;
+    }
+
+    nsNativeMenuDocListener::BlockUpdatesScope updatesBlocker;
+
+    size_t count = ChildCount();
+    for (size_t i = 0; i < count; ++i) {
+        ChildAt(i)->ContainerIsOpening();
+    }
+
+    SetPopupState(ePopupState_Open);
+    DispatchMouseEvent(mPopupContent, eXULPopupShown);
+}
+
+void
+nsMenu::Build() {
+    mNeedsRebuild = false;
+
+    while (ChildCount() > 0) {
+        RemoveChildAt(0);
+    }
+
+    InitializePopup();
+
+    if (!mPopupContent) {
+        return;
+    }
+
+    uint32_t count = mPopupContent->GetChildCount();
+    for (uint32_t i = 0; i < count; ++i) {
+        nsIContent* childContent = mPopupContent->GetChildAt(i);
+
+        UniquePtr<nsMenuObject> child = CreateChild(childContent);
+
+        if (!child) {
+            continue;
+        }
+
+        AppendChild(Move(child));
+    }
+}
+
+void
+nsMenu::InitializePopup() {
+    nsCOMPtr<nsIContent> oldPopupContent;
+    oldPopupContent.swap(mPopupContent);
+
+    for (uint32_t i = 0; i < ContentNode()->GetChildCount(); ++i) {
+        nsIContent* child = ContentNode()->GetChildAt(i);
+
+        int32_t dummy;
+        nsCOMPtr<nsIAtom> tag = child->OwnerDoc()->BindingManager()->ResolveTag(child, &dummy);
+        if (tag == nsGkAtoms::menupopup) {
+            mPopupContent = child;
+            break;
+        }
+    }
+
+    if (oldPopupContent == mPopupContent) {
+        return;
+    }
+
+    // The popup has changed
+
+    if (oldPopupContent) {
+        DocListener()->UnregisterForContentChanges(oldPopupContent);
+    }
+
+    SetPopupState(ePopupState_Closed);
+
+    if (!mPopupContent) {
+        return;
+    }
+
+    AttachXBLBindings(mPopupContent);
+
+    DocListener()->RegisterForContentChanges(mPopupContent, this);
+}
+
+void
+nsMenu::RemoveChildAt(size_t aIndex) {
+    MOZ_ASSERT(IsInBatchedUpdate() || !mPlaceholderItem,
+               "Shouldn't have a placeholder menuitem");
+
+    nsMenuContainer::RemoveChildAt(aIndex, !IsInBatchedUpdate());
+    StructureMutated();
+
+    if (!IsInBatchedUpdate()) {
+        MaybeAddPlaceholderItem();
+    }
+}
+
+void
+nsMenu::RemoveChild(nsIContent* aChild) {
+    size_t index = IndexOf(aChild);
+    if (index == NoIndex) {
+        return;
+    }
+
+    RemoveChildAt(index);
+}
+
+void
+nsMenu::InsertChildAfter(UniquePtr<nsMenuObject> aChild,
+                         nsIContent* aPrevSibling) {
+    if (!IsInBatchedUpdate()) {
+        EnsureNoPlaceholderItem();
+    }
+
+    nsMenuContainer::InsertChildAfter(Move(aChild), aPrevSibling,
+                                      !IsInBatchedUpdate());
+    StructureMutated();
+}
+
+void
+nsMenu::AppendChild(UniquePtr<nsMenuObject> aChild) {
+    if (!IsInBatchedUpdate()) {
+        EnsureNoPlaceholderItem();
+    }
+
+    nsMenuContainer::AppendChild(Move(aChild), !IsInBatchedUpdate());
+    StructureMutated();
+}
+
+bool 
+nsMenu::IsInBatchedUpdate() const {
+    return mBatchedUpdateState != eBatchedUpdateState_Inactive;
+}
+
+void
+nsMenu::StructureMutated() {
+    if (!IsInBatchedUpdate()) {
+        return;
+    }
+
+    mBatchedUpdateState = eBatchedUpdateState_DidMutate;
+}
+
+bool
+nsMenu::CanOpen() const {
+    bool isVisible = dbusmenu_menuitem_property_get_bool(GetNativeData(),
+                                                         DBUSMENU_MENUITEM_PROP_VISIBLE);
+    bool isDisabled = ContentNode()->AttrValueIs(kNameSpaceID_None,
+                                                 nsGkAtoms::disabled,
+                                                 nsGkAtoms::_true,
+                                                 eCaseMatters);
+
+    return (isVisible && !isDisabled);
+}
+
+void
+nsMenu::HandleContentInserted(nsIContent* aContainer,
+                              nsIContent* aChild,
+                              nsIContent* aPrevSibling) {
+    if (aContainer == mPopupContent) {
+        UniquePtr<nsMenuObject> child = CreateChild(aChild);
+
+        if (child) {
+            InsertChildAfter(Move(child), aPrevSibling);
+        }
+    } else {
+        Build();
+    }
+}
+
+void
+nsMenu::HandleContentRemoved(nsIContent* aContainer, nsIContent* aChild) {
+    if (aContainer == mPopupContent) {
+        RemoveChild(aChild);
+    } else {
+        Build();
+    }
+}
+
+void
+nsMenu::InitializeNativeData() {
+    // Dbusmenu provides an "about-to-show" signal, and also "opened" and
+    // "closed" events. However, Unity is the only thing that sends
+    // both "about-to-show" and "opened" events. Unity 2D and the HUD only
+    // send "opened" events, so we ignore "about-to-show" (I don't think
+    // there's any real difference between them anyway).
+    // To complicate things, there are certain conditions where we don't
+    // get a "closed" event, so we need to be able to handle this :/
+    g_signal_connect(G_OBJECT(GetNativeData()), "event",
+                     G_CALLBACK(menu_event_cb), this);
+
+    mNeedsRebuild = true;
+    mNeedsUpdate = true;
+
+    MaybeAddPlaceholderItem();
+
+    AttachXBLBindings(ContentNode());
+}
+
+void
+nsMenu::Update(nsStyleContext* aStyleContext) {
+    if (mNeedsUpdate) {
+        mNeedsUpdate = false;
+
+        UpdateLabel();
+        UpdateSensitivity();
+    }
+
+    UpdateVisibility(aStyleContext);
+    UpdateIcon(aStyleContext);
+}
+
+nsMenuObject::PropertyFlags
+nsMenu::SupportedProperties() const {
+    return static_cast<nsMenuObject::PropertyFlags>(
+        nsMenuObject::ePropLabel |
+        nsMenuObject::ePropEnabled |
+        nsMenuObject::ePropVisible |
+        nsMenuObject::ePropIconData |
+        nsMenuObject::ePropChildDisplay
+    );
+}
+
+void
+nsMenu::OnAttributeChanged(nsIContent* aContent, nsIAtom* aAttribute) {
+    MOZ_ASSERT(aContent == ContentNode() || aContent == mPopupContent,
+               "Received an event that wasn't meant for us!");
+
+    if (mNeedsUpdate) {
+        return;
+    }
+
+    if (aContent != ContentNode()) {
+        return;
+    }
+
+    if (!Parent()->IsBeingDisplayed()) {
+        mNeedsUpdate = true;
+        return;
+    }
+
+    if (aAttribute == nsGkAtoms::disabled) {
+        UpdateSensitivity();
+    } else if (aAttribute == nsGkAtoms::label || 
+               aAttribute == nsGkAtoms::accesskey ||
+               aAttribute == nsGkAtoms::crop) {
+        UpdateLabel();
+    } else if (aAttribute == nsGkAtoms::hidden ||
+        aAttribute == nsGkAtoms::collapsed) {
+        RefPtr<nsStyleContext> sc = GetStyleContext();
+        UpdateVisibility(sc);
+    } else if (aAttribute == nsGkAtoms::image) {
+        RefPtr<nsStyleContext> sc = GetStyleContext();
+        UpdateIcon(sc);
+    }
+}
+
+void
+nsMenu::OnContentInserted(nsIContent* aContainer, nsIContent* aChild,
+                          nsIContent* aPrevSibling) {
+    MOZ_ASSERT(aContainer == ContentNode() || aContainer == mPopupContent,
+               "Received an event that wasn't meant for us!");
+
+    if (mNeedsRebuild) {
+        return;
+    }
+
+    if (mPopupState == ePopupState_Closed) {
+        mNeedsRebuild = true;
+        return;
+    }
+
+    nsContentUtils::AddScriptRunner(
+        new nsMenuContentInsertedEvent(this, aContainer, aChild,
+                                       aPrevSibling));
+}
+
+void
+nsMenu::OnContentRemoved(nsIContent* aContainer, nsIContent* aChild) {
+    MOZ_ASSERT(aContainer == ContentNode() || aContainer == mPopupContent,
+               "Received an event that wasn't meant for us!");
+
+    if (mNeedsRebuild) {
+        return;
+    }
+
+    if (mPopupState == ePopupState_Closed) {
+        mNeedsRebuild = true;
+        return;
+    }
+
+    nsContentUtils::AddScriptRunner(
+        new nsMenuContentRemovedEvent(this, aContainer, aChild));
+}
+
+/*
+ * Some menus (eg, the History menu in Firefox) refresh themselves on
+ * opening by removing all children and then re-adding new ones. As this
+ * happens whilst the menu is opening in Unity, it causes some flickering
+ * as the menu popup is resized multiple times. To avoid this, we try to
+ * reuse native menu items when the menu structure changes during a
+ * batched update. If we can handle menu structure changes from Goanna
+ * just by updating properties of native menu items (rather than destroying
+ * and creating new ones), then we eliminate any flickering that occurs as
+ * the menu is opened. To do this, we don't modify any native menu items
+ * until the end of the update batch.
+ */
+
+void
+nsMenu::OnBeginUpdates(nsIContent* aContent) {
+    MOZ_ASSERT(aContent == ContentNode() || aContent == mPopupContent,
+               "Received an event that wasn't meant for us!");
+    MOZ_ASSERT(!IsInBatchedUpdate(), "Already in an update batch!");
+
+    if (aContent != mPopupContent) {
+        return;
+    }
+
+    mBatchedUpdateState = eBatchedUpdateState_Active;
+}
+
+void
+nsMenu::OnEndUpdates() {
+    if (!IsInBatchedUpdate()) {
+        return;
+    }
+
+    bool didMutate = mBatchedUpdateState == eBatchedUpdateState_DidMutate;
+    mBatchedUpdateState = eBatchedUpdateState_Inactive;
+
+    /* Optimize for the case where we only had attribute changes */
+    if (!didMutate) {
+        return;
+    }
+
+    EnsureNoPlaceholderItem();
+
+    GList* nextNativeChild = dbusmenu_menuitem_get_children(GetNativeData());
+    DbusmenuMenuitem* nextOwnedNativeChild = nullptr;
+
+    size_t count = ChildCount();
+
+    // Find the first native menu item that is `owned` by a corresponding
+    // Goanna menuitem
+    for (size_t i = 0; i < count; ++i) {
+        if (ChildAt(i)->GetNativeData()) {
+            nextOwnedNativeChild = ChildAt(i)->GetNativeData();
+            break;
+        }
+    }
+
+    // Now iterate over all Goanna menuitems
+    for (size_t i = 0; i < count; ++i) {
+        nsMenuObject* child = ChildAt(i);
+
+        if (child->GetNativeData()) {
+            // This child already has a corresponding native menuitem.
+            // Remove all preceding orphaned native items. At this point, we
+            // modify the native menu structure.
+            while (nextNativeChild &&
+                   nextNativeChild->data != nextOwnedNativeChild) {
+
+                DbusmenuMenuitem* data =
+                    static_cast<DbusmenuMenuitem *>(nextNativeChild->data);
+                nextNativeChild = nextNativeChild->next;
+
+                MOZ_ALWAYS_TRUE(dbusmenu_menuitem_child_delete(GetNativeData(),
+                                                               data));
+            }
+
+            if (nextNativeChild) {
+                nextNativeChild = nextNativeChild->next;
+            }
+
+            // Now find the next native menu item that is `owned`
+            nextOwnedNativeChild = nullptr;
+            for (size_t j = i + 1; j < count; ++j) {
+                if (ChildAt(j)->GetNativeData()) {
+                    nextOwnedNativeChild = ChildAt(j)->GetNativeData();
+                    break;
+                }
+            }
+        } else {
+            // This child is new, and doesn't have a native menu item. Find one!
+            if (nextNativeChild &&
+                nextNativeChild->data != nextOwnedNativeChild) {
+
+                DbusmenuMenuitem* data =
+                    static_cast<DbusmenuMenuitem *>(nextNativeChild->data);
+
+                if (NS_SUCCEEDED(child->AdoptNativeData(data))) {
+                    nextNativeChild = nextNativeChild->next;
+                }
+            }
+
+            // There wasn't a suitable one available, so create a new one.
+            // At this point, we modify the native menu structure.
+            if (!child->GetNativeData()) {
+                child->CreateNativeData();
+                MOZ_ALWAYS_TRUE(
+                    dbusmenu_menuitem_child_add_position(GetNativeData(),
+                                                         child->GetNativeData(),
+                                                         i));
+            }
+        }
+    }
+
+    while (nextNativeChild) {
+        DbusmenuMenuitem* data =
+            static_cast<DbusmenuMenuitem *>(nextNativeChild->data);
+        nextNativeChild = nextNativeChild->next;
+
+        MOZ_ALWAYS_TRUE(dbusmenu_menuitem_child_delete(GetNativeData(), data));
+    }
+
+    MaybeAddPlaceholderItem();
+}
+
+nsMenu::nsMenu(nsMenuContainer* aParent, nsIContent* aContent) :
+    nsMenuContainer(aParent, aContent),
+    mNeedsRebuild(false),
+    mNeedsUpdate(false),
+    mPlaceholderItem(nullptr),
+    mPopupState(ePopupState_Closed),
+    mBatchedUpdateState(eBatchedUpdateState_Inactive) {
+    MOZ_COUNT_CTOR(nsMenu);
+}
+
+nsMenu::~nsMenu() {
+    if (IsInBatchedUpdate()) {
+        OnEndUpdates();
+    }
+
+    // Although nsTArray will take care of this in its destructor,
+    // we have to manually ensure children are removed from our native menu
+    // item, just in case our parent recycles us
+    while (ChildCount() > 0) {
+        RemoveChildAt(0);
+    }
+
+    EnsureNoPlaceholderItem();
+
+    if (DocListener() && mPopupContent) {
+        DocListener()->UnregisterForContentChanges(mPopupContent);
+    }
+
+    if (GetNativeData()) {
+        g_signal_handlers_disconnect_by_func(GetNativeData(),
+                                             FuncToGpointer(menu_event_cb),
+                                             this);
+    }
+
+    MOZ_COUNT_DTOR(nsMenu);
+}
+
+nsMenuObject::EType
+nsMenu::Type() const {
+    return eType_Menu;
+}
+
+bool
+nsMenu::IsBeingDisplayed() const {
+    return mPopupState == ePopupState_Open;
+}
+
+bool
+nsMenu::NeedsRebuild() const {
+    return mNeedsRebuild;
+}
+
+void
+nsMenu::OpenMenu() {
+    if (!CanOpen()) {
+        return;
+    }
+
+    if (mOpenDelayTimer) {
+        return;
+    }
+
+    // Here, we synchronously fire popupshowing and popupshown events and then
+    // open the menu after a short delay. This allows the menu to refresh before
+    // it's shown, and avoids an issue where keyboard focus is not on the first
+    // item of the history menu in Firefox when opening it with the keyboard,
+    // because extra items to appear at the top of the menu
+
+    OnOpen();
+
+    mOpenDelayTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
+    if (!mOpenDelayTimer) {
+        return;
+    }
+
+    if (NS_FAILED(mOpenDelayTimer->InitWithFuncCallback(DoOpenCallback,
+                                                        this,
+                                                        100,
+                                                        nsITimer::TYPE_ONE_SHOT))) {
+        mOpenDelayTimer = nullptr;
+    }
+}
+
+void
+nsMenu::OnClose() {
+    if (mPopupState == ePopupState_Closed) {
+        return;
+    }
+
+    MOZ_ASSERT(nsContentUtils::IsSafeToRunScript());
+
+    // We do this to avoid mutating our view of the menu until
+    // after we have finished
+    nsNativeMenuDocListener::BlockUpdatesScope updatesBlocker;
+
+    SetPopupState(ePopupState_Hiding);
+    DispatchMouseEvent(mPopupContent, eXULPopupHiding);
+
+    // Sigh, make sure all of our descendants are closed, as we don't
+    // always get closed events for submenus when scrubbing quickly through
+    // the menu
+    size_t count = ChildCount();
+    for (size_t i = 0; i < count; ++i) {
+        if (ChildAt(i)->Type() == nsMenuObject::eType_Menu) {
+            static_cast<nsMenu *>(ChildAt(i))->OnClose();
+        }
+    }
+
+    SetPopupState(ePopupState_Closed);
+    DispatchMouseEvent(mPopupContent, eXULPopupHidden);
+
+    ContentNode()->UnsetAttr(kNameSpaceID_None, nsGkAtoms::open, true);
+}