The Tor Browser: layout/xul/nsMenuFrame.cpp@97036ab72558 (annotated)

layout/xul/nsMenuFrame.cpp@97036ab72558 (annotated)

layout/xul/nsMenuFrame.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- Mode: C++; tab-width: 8; 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 "nsGkAtoms.h"
 #include "nsHTMLParts.h"
 #include "nsMenuFrame.h"
 #include "nsBoxFrame.h"
 #include "nsIContent.h"
 #include "nsIAtom.h"
 #include "nsPresContext.h"
 #include "nsIPresShell.h"
 #include "nsStyleContext.h"
 #include "nsCSSRendering.h"
 #include "nsNameSpaceManager.h"
 #include "nsMenuPopupFrame.h"
 #include "nsMenuBarFrame.h"
 #include "nsIDocument.h"
 #include "nsIDOMElement.h"
 #include "nsIComponentManager.h"
 #include "nsBoxLayoutState.h"
 #include "nsIScrollableFrame.h"
 #include "nsBindingManager.h"
 #include "nsIServiceManager.h"
 #include "nsCSSFrameConstructor.h"
 #include "nsIDOMKeyEvent.h"
 #include "nsXPIDLString.h"
 #include "nsReadableUtils.h"
 #include "nsUnicharUtils.h"
 #include "nsIStringBundle.h"
 #include "nsContentUtils.h"
 #include "nsDisplayList.h"
 #include "nsIReflowCallback.h"
 #include "nsISound.h"
 #include "nsIDOMXULMenuListElement.h"
 #include "mozilla/Attributes.h"
 #include "mozilla/EventDispatcher.h"
 #include "mozilla/EventStateManager.h"
 #include "mozilla/Likely.h"
 #include "mozilla/LookAndFeel.h"
 #include "mozilla/MouseEvents.h"
 #include "mozilla/Preferences.h"
 #include "mozilla/Services.h"
 #include "mozilla/TextEvents.h"
 #include "mozilla/dom/Element.h"
 #include <algorithm>
 using namespace mozilla;
 #define NS_MENU_POPUP_LIST_INDEX 0
 #if defined(XP_WIN)
 #define NSCONTEXTMENUISMOUSEUP 1
 #endif
 static void
 AssertNotCalled(void* aPropertyValue)
 {
   NS_ERROR("popup list should never be destroyed by the FramePropertyTable");
 }
 NS_DECLARE_FRAME_PROPERTY(PopupListProperty, AssertNotCalled)
 static int32_t gEatMouseMove = false;
 const int32_t kBlinkDelay = 67; // milliseconds
 // this class is used for dispatching menu activation events asynchronously.
 class nsMenuActivateEvent : public nsRunnable
 {
 public:
   nsMenuActivateEvent(nsIContent *aMenu,
                       nsPresContext* aPresContext,
                       bool aIsActivate)
     : mMenu(aMenu), mPresContext(aPresContext), mIsActivate(aIsActivate)
   {
   }
   NS_IMETHOD Run() MOZ_OVERRIDE
   {
     nsAutoString domEventToFire;
     if (mIsActivate) {
       // Highlight the menu.
       mMenu->SetAttr(kNameSpaceID_None, nsGkAtoms::menuactive,
                      NS_LITERAL_STRING("true"), true);
       // The menuactivated event is used by accessibility to track the user's
       // movements through menus
       domEventToFire.AssignLiteral("DOMMenuItemActive");
     }
     else {
       // Unhighlight the menu.
       mMenu->UnsetAttr(kNameSpaceID_None, nsGkAtoms::menuactive, true);
       domEventToFire.AssignLiteral("DOMMenuItemInactive");
     }
     nsCOMPtr<nsIDOMEvent> event;
     if (NS_SUCCEEDED(EventDispatcher::CreateEvent(mMenu, mPresContext, nullptr,
                                                   NS_LITERAL_STRING("Events"),
                                                   getter_AddRefs(event)))) {
       event->InitEvent(domEventToFire, true, true);
       event->SetTrusted(true);
       EventDispatcher::DispatchDOMEvent(mMenu, nullptr, event,
                                         mPresContext, nullptr);
     }
     return NS_OK;
   }
 private:
   nsCOMPtr<nsIContent> mMenu;
   nsRefPtr<nsPresContext> mPresContext;
   bool mIsActivate;
 };
 class nsMenuAttributeChangedEvent : public nsRunnable
 {
 public:
   nsMenuAttributeChangedEvent(nsIFrame* aFrame, nsIAtom* aAttr)
   : mFrame(aFrame), mAttr(aAttr)
   {
   }
   NS_IMETHOD Run() MOZ_OVERRIDE
   {
     nsMenuFrame* frame = static_cast<nsMenuFrame*>(mFrame.GetFrame());
     NS_ENSURE_STATE(frame);
     if (mAttr == nsGkAtoms::checked) {
       frame->UpdateMenuSpecialState(frame->PresContext());
     } else if (mAttr == nsGkAtoms::acceltext) {
       // someone reset the accelText attribute,
       // so clear the bit that says *we* set it
       frame->RemoveStateBits(NS_STATE_ACCELTEXT_IS_DERIVED);
       frame->BuildAcceleratorText(true);
     }
     else if (mAttr == nsGkAtoms::key) {
       frame->BuildAcceleratorText(true);
     } else if (mAttr == nsGkAtoms::type || mAttr == nsGkAtoms::name) {
       frame->UpdateMenuType(frame->PresContext());
     }
     return NS_OK;
   }
 protected:
   nsWeakFrame       mFrame;
   nsCOMPtr<nsIAtom> mAttr;
 };
 //
 // NS_NewMenuFrame and NS_NewMenuItemFrame
 //
 // Wrappers for creating a new menu popup container
 //
 nsIFrame*
 NS_NewMenuFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
 {
   nsMenuFrame* it = new (aPresShell) nsMenuFrame (aPresShell, aContext);
   it->SetIsMenu(true);
   return it;
 }
 nsIFrame*
 NS_NewMenuItemFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
 {
   nsMenuFrame* it = new (aPresShell) nsMenuFrame (aPresShell, aContext);
   it->SetIsMenu(false);
   return it;
 }
 NS_IMPL_FRAMEARENA_HELPERS(nsMenuFrame)
 NS_QUERYFRAME_HEAD(nsMenuFrame)
   NS_QUERYFRAME_ENTRY(nsMenuFrame)
 NS_QUERYFRAME_TAIL_INHERITING(nsBoxFrame)
 nsMenuFrame::nsMenuFrame(nsIPresShell* aShell, nsStyleContext* aContext):
   nsBoxFrame(aShell, aContext),
     mIsMenu(false),
     mChecked(false),
     mIgnoreAccelTextChange(false),
     mType(eMenuType_Normal),
     mMenuParent(nullptr),
     mBlinkState(0)
 {
 }
 void
 nsMenuFrame::SetParent(nsIFrame* aParent)
 {
   nsBoxFrame::SetParent(aParent);
   InitMenuParent(aParent);
 }
 void
 nsMenuFrame::InitMenuParent(nsIFrame* aParent)
 {
   while (aParent) {
     nsMenuPopupFrame* popup = do_QueryFrame(aParent);
     if (popup) {
       mMenuParent = popup;
       break;
     }
     nsMenuBarFrame* menubar = do_QueryFrame(aParent);
     if (menubar) {
       mMenuParent = menubar;
       break;
     }
     aParent = aParent->GetParent();
   }
 }
 class nsASyncMenuInitialization MOZ_FINAL : public nsIReflowCallback
 {
 public:
   nsASyncMenuInitialization(nsIFrame* aFrame)
     : mWeakFrame(aFrame)
   {
   }
   virtual bool ReflowFinished() MOZ_OVERRIDE
   {
     bool shouldFlush = false;
     nsMenuFrame* menu = do_QueryFrame(mWeakFrame.GetFrame());
     if (menu) {
       menu->UpdateMenuType(menu->PresContext());
       shouldFlush = true;
     }
     delete this;
     return shouldFlush;
   }
   virtual void ReflowCallbackCanceled() MOZ_OVERRIDE
   {
     delete this;
   }
   nsWeakFrame mWeakFrame;
 };
 void
 nsMenuFrame::Init(nsIContent*      aContent,
                   nsIFrame*        aParent,
                   nsIFrame*        aPrevInFlow)
 {
   nsBoxFrame::Init(aContent, aParent, aPrevInFlow);
   // Set up a mediator which can be used for callbacks on this frame.
   mTimerMediator = new nsMenuTimerMediator(this);
   InitMenuParent(aParent);
   BuildAcceleratorText(false);
   nsIReflowCallback* cb = new nsASyncMenuInitialization(this);
   PresContext()->PresShell()->PostReflowCallback(cb);
 }
 const nsFrameList&
 nsMenuFrame::GetChildList(ChildListID aListID) const
 {
   if (kPopupList == aListID) {
     nsFrameList* list = GetPopupList();
     return list ? *list : nsFrameList::EmptyList();
   }
   return nsBoxFrame::GetChildList(aListID);
 }
 void
 nsMenuFrame::GetChildLists(nsTArray<ChildList>* aLists) const
 {
   nsBoxFrame::GetChildLists(aLists);
   nsFrameList* list = GetPopupList();
   if (list) {
     list->AppendIfNonempty(aLists, kPopupList);
   }
 }
 nsMenuPopupFrame*
 nsMenuFrame::GetPopup()
 {
   nsFrameList* popupList = GetPopupList();
   return popupList ? static_cast<nsMenuPopupFrame*>(popupList->FirstChild()) :
                      nullptr;
 }
 nsFrameList*
 nsMenuFrame::GetPopupList() const
 {
   if (!HasPopup()) {
     return nullptr;
   }
   nsFrameList* prop =
     static_cast<nsFrameList*>(Properties().Get(PopupListProperty()));
   NS_ASSERTION(prop && prop->GetLength() == 1 &&
                prop->FirstChild()->GetType() == nsGkAtoms::menuPopupFrame,
                "popup list should have exactly one nsMenuPopupFrame");
   return prop;
 }
 void
 nsMenuFrame::DestroyPopupList()
 {
   NS_ASSERTION(HasPopup(), "huh?");
   nsFrameList* prop =
     static_cast<nsFrameList*>(Properties().Remove(PopupListProperty()));
   NS_ASSERTION(prop && prop->IsEmpty(),
                "popup list must exist and be empty when destroying");
   RemoveStateBits(NS_STATE_MENU_HAS_POPUP_LIST);
   prop->Delete(PresContext()->PresShell());
 }
 void
 nsMenuFrame::SetPopupFrame(nsFrameList& aFrameList)
 {
   for (nsFrameList::Enumerator e(aFrameList); !e.AtEnd(); e.Next()) {
     nsMenuPopupFrame* popupFrame = do_QueryFrame(e.get());
     if (popupFrame) {
       // Remove the frame from the list and store it in a nsFrameList* property.
       aFrameList.RemoveFrame(popupFrame);
       nsFrameList* popupList = new (PresContext()->PresShell()) nsFrameList(popupFrame, popupFrame);
       Properties().Set(PopupListProperty(), popupList);
       AddStateBits(NS_STATE_MENU_HAS_POPUP_LIST);
       break;
     }
   }
 }
 nsresult
 nsMenuFrame::SetInitialChildList(ChildListID     aListID,
                                  nsFrameList&    aChildList)
 {
   NS_ASSERTION(!HasPopup(), "SetInitialChildList called twice?");
   if (aListID == kPrincipalList || aListID == kPopupList) {
     SetPopupFrame(aChildList);
   }
   return nsBoxFrame::SetInitialChildList(aListID, aChildList);
 }
 void
 nsMenuFrame::DestroyFrom(nsIFrame* aDestructRoot)
 {
   // Kill our timer if one is active. This is not strictly necessary as
   // the pointer to this frame will be cleared from the mediator, but
   // this is done for added safety.
   if (mOpenTimer) {
     mOpenTimer->Cancel();
   }
   StopBlinking();
   // Null out the pointer to this frame in the mediator wrapper so that it
   // doesn't try to interact with a deallocated frame.
   mTimerMediator->ClearFrame();
   // if the menu content is just being hidden, it may be made visible again
   // later, so make sure to clear the highlighting.
   mContent->UnsetAttr(kNameSpaceID_None, nsGkAtoms::menuactive, false);
   // are we our menu parent's current menu item?
   if (mMenuParent && mMenuParent->GetCurrentMenuItem() == this) {
     // yes; tell it that we're going away
     mMenuParent->CurrentMenuIsBeingDestroyed();
   }
   nsFrameList* popupList = GetPopupList();
   if (popupList) {
     popupList->DestroyFramesFrom(aDestructRoot);
     DestroyPopupList();
   }
   nsBoxFrame::DestroyFrom(aDestructRoot);
 }
 void
 nsMenuFrame::BuildDisplayListForChildren(nsDisplayListBuilder*   aBuilder,
                                          const nsRect&           aDirtyRect,
                                          const nsDisplayListSet& aLists)
 {
   if (!aBuilder->IsForEventDelivery()) {
     nsBoxFrame::BuildDisplayListForChildren(aBuilder, aDirtyRect, aLists);
     return;
   }
   nsDisplayListCollection set;
   nsBoxFrame::BuildDisplayListForChildren(aBuilder, aDirtyRect, set);
   WrapListsInRedirector(aBuilder, set, aLists);
 }
 nsresult
 nsMenuFrame::HandleEvent(nsPresContext* aPresContext,
                          WidgetGUIEvent* aEvent,
                          nsEventStatus* aEventStatus)
 {
   NS_ENSURE_ARG_POINTER(aEventStatus);
   if (nsEventStatus_eConsumeNoDefault == *aEventStatus ||
       (mMenuParent && mMenuParent->IsMenuLocked())) {
     return NS_OK;
   }
   nsWeakFrame weakFrame(this);
   if (*aEventStatus == nsEventStatus_eIgnore)
     *aEventStatus = nsEventStatus_eConsumeDoDefault;
   bool onmenu = IsOnMenu();
   if (aEvent->message == NS_KEY_PRESS && !IsDisabled()) {
     WidgetKeyboardEvent* keyEvent = aEvent->AsKeyboardEvent();
     uint32_t keyCode = keyEvent->keyCode;
 #ifdef XP_MACOSX
     // On mac, open menulist on either up/down arrow or space (w/o Cmd pressed)
     if (!IsOpen() && ((keyEvent->charCode == NS_VK_SPACE && !keyEvent->IsMeta()) ||
         (keyCode == NS_VK_UP || keyCode == NS_VK_DOWN))) {
       *aEventStatus = nsEventStatus_eConsumeNoDefault;
       OpenMenu(false);
     }
 #else
     // On other platforms, toggle menulist on unmodified F4 or Alt arrow
     if ((keyCode == NS_VK_F4 && !keyEvent->IsAlt()) ||
         ((keyCode == NS_VK_UP || keyCode == NS_VK_DOWN) && keyEvent->IsAlt())) {
       *aEventStatus = nsEventStatus_eConsumeNoDefault;
       ToggleMenuState();
     }
 #endif
   }
   else if (aEvent->message == NS_MOUSE_BUTTON_DOWN &&
            aEvent->AsMouseEvent()->button == WidgetMouseEvent::eLeftButton &&
            !IsDisabled() && IsMenu()) {
     // The menu item was selected. Bring up the menu.
     // We have children.
     // Don't prevent the default action here, since that will also cancel
     // potential drag starts.
     if (!mMenuParent || mMenuParent->IsMenuBar()) {
       ToggleMenuState();
     }
     else {
       if (!IsOpen()) {
         OpenMenu(false);
       }
     }
   }
   else if (
 #ifndef NSCONTEXTMENUISMOUSEUP
            (aEvent->message == NS_MOUSE_BUTTON_UP &&
             aEvent->AsMouseEvent()->button == WidgetMouseEvent::eRightButton) &&
 #else
            aEvent->message == NS_CONTEXTMENU &&
 #endif
            onmenu && !IsMenu() && !IsDisabled()) {
     // if this menu is a context menu it accepts right-clicks...fire away!
     // Make sure we cancel default processing of the context menu event so
     // that it doesn't bubble and get seen again by the popuplistener and show
     // another context menu.
     //
     // Furthermore (there's always more, isn't there?), on some platforms (win32
     // being one of them) we get the context menu event on a mouse up while
     // on others we get it on a mouse down. For the ones where we get it on a
     // mouse down, we must continue listening for the right button up event to
     // dismiss the menu.
     if (mMenuParent->IsContextMenu()) {
       *aEventStatus = nsEventStatus_eConsumeNoDefault;
       Execute(aEvent);
     }
   }
   else if (aEvent->message == NS_MOUSE_BUTTON_UP &&
            aEvent->AsMouseEvent()->button == WidgetMouseEvent::eLeftButton &&
            !IsMenu() && !IsDisabled()) {
     // Execute the execute event handler.
     *aEventStatus = nsEventStatus_eConsumeNoDefault;
     Execute(aEvent);
   }
   else if (aEvent->message == NS_MOUSE_EXIT_SYNTH) {
     // Kill our timer if one is active.
     if (mOpenTimer) {
       mOpenTimer->Cancel();
       mOpenTimer = nullptr;
     }
     // Deactivate the menu.
     if (mMenuParent) {
       bool onmenubar = mMenuParent->IsMenuBar();
       if (!(onmenubar && mMenuParent->IsActive())) {
         if (IsMenu() && !onmenubar && IsOpen()) {
           // Submenus don't get closed up immediately.
         }
         else if (this == mMenuParent->GetCurrentMenuItem()) {
           mMenuParent->ChangeMenuItem(nullptr, false);
         }
       }
     }
   }
   else if (aEvent->message == NS_MOUSE_MOVE &&
            (onmenu || (mMenuParent && mMenuParent->IsMenuBar()))) {
     if (gEatMouseMove) {
       gEatMouseMove = false;
       return NS_OK;
     }
     // Let the menu parent know we're the new item.
     mMenuParent->ChangeMenuItem(this, false);
     NS_ENSURE_TRUE(weakFrame.IsAlive(), NS_OK);
     NS_ENSURE_TRUE(mMenuParent, NS_OK);
     // we need to check if we really became the current menu
     // item or not
     nsMenuFrame *realCurrentItem = mMenuParent->GetCurrentMenuItem();
     if (realCurrentItem != this) {
       // we didn't (presumably because a context menu was active)
       return NS_OK;
     }
     // Hovering over a menu in a popup should open it without a need for a click.
     // A timer is used so that it doesn't open if the user moves the mouse quickly
     // past the menu. This conditional check ensures that only menus have this
     // behaviour
     if (!IsDisabled() && IsMenu() && !IsOpen() && !mOpenTimer && !mMenuParent->IsMenuBar()) {
       int32_t menuDelay =
         LookAndFeel::GetInt(LookAndFeel::eIntID_SubmenuDelay, 300); // ms
       // We're a menu, we're built, we're closed, and no timer has been kicked off.
       mOpenTimer = do_CreateInstance("@mozilla.org/timer;1");
       mOpenTimer->InitWithCallback(mTimerMediator, menuDelay, nsITimer::TYPE_ONE_SHOT);
     }
   }
   return NS_OK;
 }
 void
 nsMenuFrame::ToggleMenuState()
 {
   if (IsOpen())
     CloseMenu(false);
   else
     OpenMenu(false);
 }
 void
 nsMenuFrame::PopupOpened()
 {
   nsWeakFrame weakFrame(this);
   mContent->SetAttr(kNameSpaceID_None, nsGkAtoms::open,
                     NS_LITERAL_STRING("true"), true);
   if (!weakFrame.IsAlive())
     return;
   if (mMenuParent) {
     mMenuParent->SetActive(true);
     // Make sure the current menu which is being toggled on
     // the menubar is highlighted
     mMenuParent->SetCurrentMenuItem(this);
   }
 }
 void
 nsMenuFrame::PopupClosed(bool aDeselectMenu)
 {
   nsWeakFrame weakFrame(this);
   nsContentUtils::AddScriptRunner(
     new nsUnsetAttrRunnable(mContent, nsGkAtoms::open));
   if (!weakFrame.IsAlive())
     return;
   // if the popup is for a menu on a menubar, inform menubar to deactivate
   if (mMenuParent && mMenuParent->MenuClosed()) {
     if (aDeselectMenu) {
       SelectMenu(false);
     } else {
       // We are not deselecting the parent menu while closing the popup, so send
       // a DOMMenuItemActive event to the menu to indicate that the menu is
       // becoming active again.
       nsMenuFrame *current = mMenuParent->GetCurrentMenuItem();
       if (current) {
         // However, if the menu is a descendant on a menubar, and the menubar
         // has the 'stay active' flag set, it means that the menubar is switching
         // to another toplevel menu entirely (for example from Edit to View), so
         // don't fire the DOMMenuItemActive event or else we'll send extraneous
         // events for submenus. nsMenuBarFrame::ChangeMenuItem has already deselected
         // the old menu, so it doesn't need to happen again here, and the new
         // menu can be selected right away.
         nsIFrame* parent = current;
         while (parent) {
           nsMenuBarFrame* menubar = do_QueryFrame(parent);
           if (menubar && menubar->GetStayActive())
             return;
           parent = parent->GetParent();
         }
         nsCOMPtr<nsIRunnable> event =
           new nsMenuActivateEvent(current->GetContent(),
                                   PresContext(), true);
         NS_DispatchToCurrentThread(event);
       }
     }
   }
 }
 NS_IMETHODIMP
 nsMenuFrame::SelectMenu(bool aActivateFlag)
 {
   if (mContent) {
     // When a menu opens a submenu, the mouse will often be moved onto a
     // sibling before moving onto an item within the submenu, causing the
     // parent to become deselected. We need to ensure that the parent menu
     // is reselected when an item in the submenu is selected, so navigate up
     // from the item to its popup, and then to the popup above that.
     if (aActivateFlag) {
       nsIFrame* parent = GetParent();
       while (parent) {
         nsMenuPopupFrame* menupopup = do_QueryFrame(parent);
         if (menupopup) {
           // a menu is always the direct parent of a menupopup
           nsMenuFrame* menu = do_QueryFrame(menupopup->GetParent());
           if (menu) {
             // a popup however is not necessarily the direct parent of a menu
             nsIFrame* popupParent = menu->GetParent();
             while (popupParent) {
               menupopup = do_QueryFrame(popupParent);
               if (menupopup) {
                 menupopup->SetCurrentMenuItem(menu);
                 break;
               }
               popupParent = popupParent->GetParent();
             }
           }
           break;
         }
         parent = parent->GetParent();
       }
     }
     // cancel the close timer if selecting a menu within the popup to be closed
     nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
     if (pm)
       pm->CancelMenuTimer(mMenuParent);
     nsCOMPtr<nsIRunnable> event =
       new nsMenuActivateEvent(mContent, PresContext(), aActivateFlag);
     NS_DispatchToCurrentThread(event);
   }
   return NS_OK;
 }
 nsresult
 nsMenuFrame::AttributeChanged(int32_t aNameSpaceID,
                               nsIAtom* aAttribute,
                               int32_t aModType)
 {
   if (aAttribute == nsGkAtoms::acceltext && mIgnoreAccelTextChange) {
     // Reset the flag so that only one change is ignored.
     mIgnoreAccelTextChange = false;
     return NS_OK;
   }
   if (aAttribute == nsGkAtoms::checked ||
       aAttribute == nsGkAtoms::acceltext ||
       aAttribute == nsGkAtoms::key ||
       aAttribute == nsGkAtoms::type ||
       aAttribute == nsGkAtoms::name) {
     nsCOMPtr<nsIRunnable> event =
       new nsMenuAttributeChangedEvent(this, aAttribute);
     nsContentUtils::AddScriptRunner(event);
   }
   return NS_OK;
 }
 nsIContent*
 nsMenuFrame::GetAnchor()
 {
   mozilla::dom::Element* anchor = nullptr;
   nsAutoString id;
   mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::anchor, id);
   if (!id.IsEmpty()) {
     nsIDocument* doc = mContent->OwnerDoc();
     anchor =
       doc->GetAnonymousElementByAttribute(mContent, nsGkAtoms::anonid, id);
     if (!anchor) {
       anchor = doc->GetElementById(id);
     }
   }
   // Always return the menu's content if the anchor wasn't set or wasn't found.
   return anchor && anchor->GetPrimaryFrame() ? anchor : mContent;
 }
 void
 nsMenuFrame::OpenMenu(bool aSelectFirstItem)
 {
   if (!mContent)
     return;
   gEatMouseMove = true;
   nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
   if (pm) {
     pm->KillMenuTimer();
     // This opens the menu asynchronously
     pm->ShowMenu(mContent, aSelectFirstItem, true);
   }
 }
 void
 nsMenuFrame::CloseMenu(bool aDeselectMenu)
 {
   gEatMouseMove = true;
   // Close the menu asynchronously
   nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
   if (pm && HasPopup())
     pm->HidePopup(GetPopup()->GetContent(), false, aDeselectMenu, true, false);
 }
 bool
 nsMenuFrame::IsSizedToPopup(nsIContent* aContent, bool aRequireAlways)
 {
   nsAutoString sizedToPopup;
   aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::sizetopopup, sizedToPopup);
   return sizedToPopup.EqualsLiteral("always") ||
          (!aRequireAlways && sizedToPopup.EqualsLiteral("pref"));
 }
 nsSize
 nsMenuFrame::GetMinSize(nsBoxLayoutState& aBoxLayoutState)
 {
   nsSize size = nsBoxFrame::GetMinSize(aBoxLayoutState);
   DISPLAY_MIN_SIZE(this, size);
   if (IsSizedToPopup(mContent, true))
     SizeToPopup(aBoxLayoutState, size);
   return size;
 }
 NS_IMETHODIMP
 nsMenuFrame::DoLayout(nsBoxLayoutState& aState)
 {
   // lay us out
   nsresult rv = nsBoxFrame::DoLayout(aState);
   nsMenuPopupFrame* popupFrame = GetPopup();
   if (popupFrame) {
     bool sizeToPopup = IsSizedToPopup(mContent, false);
     popupFrame->LayoutPopup(aState, this, GetAnchor()->GetPrimaryFrame(), sizeToPopup);
   }
   return rv;
 }
 #ifdef DEBUG_LAYOUT
 nsresult
 nsMenuFrame::SetDebug(nsBoxLayoutState& aState, bool aDebug)
 {
   // see if our state matches the given debug state
   bool debugSet = mState & NS_STATE_CURRENTLY_IN_DEBUG;
   bool debugChanged = (!aDebug && debugSet) || (aDebug && !debugSet);
   // if it doesn't then tell each child below us the new debug state
   if (debugChanged)
   {
       nsBoxFrame::SetDebug(aState, aDebug);
       nsMenuPopupFrame* popupFrame = GetPopup();
       if (popupFrame)
         SetDebug(aState, popupFrame, aDebug);
   }
   return NS_OK;
 }
 nsresult
 nsMenuFrame::SetDebug(nsBoxLayoutState& aState, nsIFrame* aList, bool aDebug)
 {
       if (!aList)
           return NS_OK;
       while (aList) {
         if (aList->IsBoxFrame())
           aList->SetDebug(aState, aDebug);
         aList = aList->GetNextSibling();
       }
       return NS_OK;
 }
 #endif
 //
 // Enter
 //
 // Called when the user hits the <Enter>/<Return> keys or presses the
 // shortcut key. If this is a leaf item, the item's action will be executed.
 // In either case, do nothing if the item is disabled.
 //
 nsMenuFrame*
 nsMenuFrame::Enter(WidgetGUIEvent* aEvent)
 {
   if (IsDisabled()) {
 #ifdef XP_WIN
     // behavior on Windows - close the popup chain
     if (mMenuParent) {
       nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
       if (pm) {
         nsIFrame* popup = pm->GetTopPopup(ePopupTypeAny);
         if (popup)
           pm->HidePopup(popup->GetContent(), true, true, true, false);
       }
     }
 #endif   // #ifdef XP_WIN
     // this menu item was disabled - exit
     return nullptr;
   }
   if (!IsOpen()) {
     // The enter key press applies to us.
     if (!IsMenu() && mMenuParent)
       Execute(aEvent);          // Execute our event handler
     else
       return this;
   }
   return nullptr;
 }
 bool
 nsMenuFrame::IsOpen()
 {
   nsMenuPopupFrame* popupFrame = GetPopup();
   return popupFrame && popupFrame->IsOpen();
 }
 bool
 nsMenuFrame::IsMenu()
 {
   return mIsMenu;
 }
 nsMenuListType
 nsMenuFrame::GetParentMenuListType()
 {
   if (mMenuParent && mMenuParent->IsMenu()) {
     nsMenuPopupFrame* popupFrame = static_cast<nsMenuPopupFrame*>(mMenuParent);
     nsIFrame* parentMenu = popupFrame->GetParent();
     if (parentMenu) {
       nsCOMPtr<nsIDOMXULMenuListElement> menulist = do_QueryInterface(parentMenu->GetContent());
       if (menulist) {
         bool isEditable = false;
         menulist->GetEditable(&isEditable);
         return isEditable ? eEditableMenuList : eReadonlyMenuList;
       }
     }
   }
   return eNotMenuList;
 }
 nsresult
 nsMenuFrame::Notify(nsITimer* aTimer)
 {
   // Our timer has fired.
   if (aTimer == mOpenTimer.get()) {
     mOpenTimer = nullptr;
     if (!IsOpen() && mMenuParent) {
       // make sure we didn't open a context menu in the meantime
       // (i.e. the user right-clicked while hovering over a submenu).
       nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
       if (pm) {
         if ((!pm->HasContextMenu(nullptr) || mMenuParent->IsContextMenu()) &&
             mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::menuactive,
                                   nsGkAtoms::_true, eCaseMatters)) {
           OpenMenu(false);
         }
       }
     }
   } else if (aTimer == mBlinkTimer) {
     switch (mBlinkState++) {
       case 0:
         NS_ASSERTION(false, "Blink timer fired while not blinking");
         StopBlinking();
         break;
       case 1:
         {
           // Turn the highlight back on and wait for a while before closing the menu.
           nsWeakFrame weakFrame(this);
           mContent->SetAttr(kNameSpaceID_None, nsGkAtoms::menuactive,
                             NS_LITERAL_STRING("true"), true);
           if (weakFrame.IsAlive()) {
             aTimer->InitWithCallback(mTimerMediator, kBlinkDelay, nsITimer::TYPE_ONE_SHOT);
           }
         }
         break;
       default:
         if (mMenuParent) {
           mMenuParent->LockMenuUntilClosed(false);
         }
         PassMenuCommandEventToPopupManager();
         StopBlinking();
         break;
     }
   }
   return NS_OK;
 }
 bool
 nsMenuFrame::IsDisabled()
 {
   return mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::disabled,
                                nsGkAtoms::_true, eCaseMatters);
 }
 void
 nsMenuFrame::UpdateMenuType(nsPresContext* aPresContext)
 {
   static nsIContent::AttrValuesArray strings[] =
     {&nsGkAtoms::checkbox, &nsGkAtoms::radio, nullptr};
   switch (mContent->FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::type,
                                     strings, eCaseMatters)) {
     case 0: mType = eMenuType_Checkbox; break;
     case 1:
       mType = eMenuType_Radio;
       mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::name, mGroupName);
       break;
     default:
       if (mType != eMenuType_Normal) {
         nsWeakFrame weakFrame(this);
         mContent->UnsetAttr(kNameSpaceID_None, nsGkAtoms::checked,
                             true);
         ENSURE_TRUE(weakFrame.IsAlive());
       }
       mType = eMenuType_Normal;
       break;
   }
   UpdateMenuSpecialState(aPresContext);
 }
 /* update checked-ness for type="checkbox" and type="radio" */
 void
 nsMenuFrame::UpdateMenuSpecialState(nsPresContext* aPresContext)
 {
   bool newChecked =
     mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::checked,
                           nsGkAtoms::_true, eCaseMatters);
   if (newChecked == mChecked) {
     /* checked state didn't change */
     if (mType != eMenuType_Radio)
       return; // only Radio possibly cares about other kinds of change
     if (!mChecked || mGroupName.IsEmpty())
       return;                   // no interesting change
   } else {
     mChecked = newChecked;
     if (mType != eMenuType_Radio || !mChecked)
       /*
        * Unchecking something requires no further changes, and only
        * menuRadio has to do additional work when checked.
        */
       return;
   }
   /*
    * If we get this far, we're type=radio, and:
    * - our name= changed, or
    * - we went from checked="false" to checked="true"
    */
   /*
    * Behavioural note:
    * If we're checked and renamed _into_ an existing radio group, we are
    * made the new checked item, and we unselect the previous one.
    *
    * The only other reasonable behaviour would be to check for another selected
    * item in that group.  If found, unselect ourselves, otherwise we're the
    * selected item.  That, however, would be a lot more work, and I don't think
    * it's better at all.
    */
   /* walk siblings, looking for the other checked item with the same name */
   // get the first sibling in this menu popup. This frame may be it, and if we're
   // being called at creation time, this frame isn't yet in the parent's child list.
   // All I'm saying is that this may fail, but it's most likely alright.
   nsIFrame* sib = GetParent()->GetFirstPrincipalChild();
   while (sib) {
     if (sib != this) {
       nsMenuFrame* menu = do_QueryFrame(sib);
       if (menu && menu->GetMenuType() == eMenuType_Radio &&
           menu->IsChecked() && menu->GetRadioGroupName() == mGroupName) {
         /* uncheck the old item */
         sib->GetContent()->UnsetAttr(kNameSpaceID_None, nsGkAtoms::checked,
                                      true);
         /* XXX in DEBUG, check to make sure that there aren't two checked items */
         return;
       }
     }
     sib = sib->GetNextSibling();
   }
 }
 void
 nsMenuFrame::BuildAcceleratorText(bool aNotify)
 {
   nsAutoString accelText;
   if ((GetStateBits() & NS_STATE_ACCELTEXT_IS_DERIVED) == 0) {
     mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::acceltext, accelText);
     if (!accelText.IsEmpty())
       return;
   }
   // accelText is definitely empty here.
   // Now we're going to compute the accelerator text, so remember that we did.
   AddStateBits(NS_STATE_ACCELTEXT_IS_DERIVED);
   // If anything below fails, just leave the accelerator text blank.
   nsWeakFrame weakFrame(this);
   mContent->UnsetAttr(kNameSpaceID_None, nsGkAtoms::acceltext, aNotify);
   ENSURE_TRUE(weakFrame.IsAlive());
   // See if we have a key node and use that instead.
   nsAutoString keyValue;
   mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::key, keyValue);
   if (keyValue.IsEmpty())
     return;
   // Turn the document into a DOM document so we can use getElementById
   nsIDocument *document = mContent->GetDocument();
   if (!document)
     return;
   nsIContent *keyElement = document->GetElementById(keyValue);
   if (!keyElement) {
 #ifdef DEBUG
     nsAutoString label;
     mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::label, label);
     nsAutoString msg = NS_LITERAL_STRING("Key '") +
                        keyValue +
                        NS_LITERAL_STRING("' of menu item '") +
                        label +
                        NS_LITERAL_STRING("' could not be found");
     NS_WARNING(NS_ConvertUTF16toUTF8(msg).get());
 #endif
     return;
   }
   // get the string to display as accelerator text
   // check the key element's attributes in this order:
   // |keytext|, |key|, |keycode|
   nsAutoString accelString;
   keyElement->GetAttr(kNameSpaceID_None, nsGkAtoms::keytext, accelString);
   if (accelString.IsEmpty()) {
     keyElement->GetAttr(kNameSpaceID_None, nsGkAtoms::key, accelString);
     if (!accelString.IsEmpty()) {
       ToUpperCase(accelString);
     } else {
       nsAutoString keyCode;
       keyElement->GetAttr(kNameSpaceID_None, nsGkAtoms::keycode, keyCode);
       ToUpperCase(keyCode);
       nsresult rv;
       nsCOMPtr<nsIStringBundleService> bundleService =
         mozilla::services::GetStringBundleService();
       if (bundleService) {
         nsCOMPtr<nsIStringBundle> bundle;
         rv = bundleService->CreateBundle("chrome://global/locale/keys.properties",
                                          getter_AddRefs(bundle));
         if (NS_SUCCEEDED(rv) && bundle) {
           nsXPIDLString keyName;
           rv = bundle->GetStringFromName(keyCode.get(), getter_Copies(keyName));
           if (keyName)
             accelString = keyName;
         }
       }
       // nothing usable found, bail
       if (accelString.IsEmpty())
         return;
     }
   }
   static int32_t accelKey = 0;
   if (!accelKey)
   {
     // Compiled-in defaults, in case we can't get LookAndFeel --
     // command for mac, control for all other platforms.
 #ifdef XP_MACOSX
     accelKey = nsIDOMKeyEvent::DOM_VK_META;
 #else
     accelKey = nsIDOMKeyEvent::DOM_VK_CONTROL;
 #endif
     // Get the accelerator key value from prefs, overriding the default:
     accelKey = Preferences::GetInt("ui.key.accelKey", accelKey);
   }
   nsAutoString modifiers;
   keyElement->GetAttr(kNameSpaceID_None, nsGkAtoms::modifiers, modifiers);
   char* str = ToNewCString(modifiers);
   char* newStr;
   char* token = nsCRT::strtok(str, ", \t", &newStr);
   nsAutoString shiftText;
   nsAutoString altText;
   nsAutoString metaText;
   nsAutoString controlText;
   nsAutoString osText;
   nsAutoString modifierSeparator;
   nsContentUtils::GetShiftText(shiftText);
   nsContentUtils::GetAltText(altText);
   nsContentUtils::GetMetaText(metaText);
   nsContentUtils::GetControlText(controlText);
   nsContentUtils::GetOSText(osText);
   nsContentUtils::GetModifierSeparatorText(modifierSeparator);
   while (token) {
     if (PL_strcmp(token, "shift") == 0)
       accelText += shiftText;
     else if (PL_strcmp(token, "alt") == 0)
       accelText += altText;
     else if (PL_strcmp(token, "meta") == 0)
       accelText += metaText;
     else if (PL_strcmp(token, "os") == 0)
       accelText += osText;
     else if (PL_strcmp(token, "control") == 0)
       accelText += controlText;
     else if (PL_strcmp(token, "accel") == 0) {
       switch (accelKey)
       {
         case nsIDOMKeyEvent::DOM_VK_META:
           accelText += metaText;
           break;
         case nsIDOMKeyEvent::DOM_VK_WIN:
           accelText += osText;
           break;
         case nsIDOMKeyEvent::DOM_VK_ALT:
           accelText += altText;
           break;
         case nsIDOMKeyEvent::DOM_VK_CONTROL:
         default:
           accelText += controlText;
           break;
       }
     }
     accelText += modifierSeparator;
     token = nsCRT::strtok(newStr, ", \t", &newStr);
   }
   nsMemory::Free(str);
   accelText += accelString;
   mIgnoreAccelTextChange = true;
   mContent->SetAttr(kNameSpaceID_None, nsGkAtoms::acceltext, accelText, aNotify);
   ENSURE_TRUE(weakFrame.IsAlive());
   mIgnoreAccelTextChange = false;
 }
 void
 nsMenuFrame::Execute(WidgetGUIEvent* aEvent)
 {
   // flip "checked" state if we're a checkbox menu, or an un-checked radio menu
   bool needToFlipChecked = false;
   if (mType == eMenuType_Checkbox || (mType == eMenuType_Radio && !mChecked)) {
     needToFlipChecked = !mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::autocheck,
                                                nsGkAtoms::_false, eCaseMatters);
   }
   nsCOMPtr<nsISound> sound(do_CreateInstance("@mozilla.org/sound;1"));
   if (sound)
     sound->PlayEventSound(nsISound::EVENT_MENU_EXECUTE);
   StartBlinking(aEvent, needToFlipChecked);
 }
 bool
 nsMenuFrame::ShouldBlink()
 {
   int32_t shouldBlink =
     LookAndFeel::GetInt(LookAndFeel::eIntID_ChosenMenuItemsShouldBlink, 0);
   if (!shouldBlink)
     return false;
   // Don't blink in editable menulists.
   if (GetParentMenuListType() == eEditableMenuList)
     return false;
   return true;
 }
 void
 nsMenuFrame::StartBlinking(WidgetGUIEvent* aEvent, bool aFlipChecked)
 {
   StopBlinking();
   CreateMenuCommandEvent(aEvent, aFlipChecked);
   if (!ShouldBlink()) {
     PassMenuCommandEventToPopupManager();
     return;
   }
   // Blink off.
   nsWeakFrame weakFrame(this);
   mContent->UnsetAttr(kNameSpaceID_None, nsGkAtoms::menuactive, true);
   if (!weakFrame.IsAlive())
     return;
   if (mMenuParent) {
     // Make this menu ignore events from now on.
     mMenuParent->LockMenuUntilClosed(true);
   }
   // Set up a timer to blink back on.
   mBlinkTimer = do_CreateInstance("@mozilla.org/timer;1");
   mBlinkTimer->InitWithCallback(mTimerMediator, kBlinkDelay, nsITimer::TYPE_ONE_SHOT);
   mBlinkState = 1;
 }
 void
 nsMenuFrame::StopBlinking()
 {
   mBlinkState = 0;
   if (mBlinkTimer) {
     mBlinkTimer->Cancel();
     mBlinkTimer = nullptr;
   }
   mDelayedMenuCommandEvent = nullptr;
 }
 void
 nsMenuFrame::CreateMenuCommandEvent(WidgetGUIEvent* aEvent, bool aFlipChecked)
 {
   // Create a trusted event if the triggering event was trusted, or if
   // we're called from chrome code (since at least one of our caller
   // passes in a null event).
   bool isTrusted = aEvent ? aEvent->mFlags.mIsTrusted :
                               nsContentUtils::IsCallerChrome();
   bool shift = false, control = false, alt = false, meta = false;
   WidgetInputEvent* inputEvent = aEvent ? aEvent->AsInputEvent() : nullptr;
   if (inputEvent) {
     shift = inputEvent->IsShift();
     control = inputEvent->IsControl();
     alt = inputEvent->IsAlt();
     meta = inputEvent->IsMeta();
   }
   // Because the command event is firing asynchronously, a flag is needed to
   // indicate whether user input is being handled. This ensures that a popup
   // window won't get blocked.
   bool userinput = EventStateManager::IsHandlingUserInput();
   mDelayedMenuCommandEvent =
     new nsXULMenuCommandEvent(mContent, isTrusted, shift, control, alt, meta,
                               userinput, aFlipChecked);
 }
 void
 nsMenuFrame::PassMenuCommandEventToPopupManager()
 {
   nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
   if (pm && mMenuParent && mDelayedMenuCommandEvent) {
     pm->ExecuteMenu(mContent, mDelayedMenuCommandEvent);
   }
   mDelayedMenuCommandEvent = nullptr;
 }
 nsresult
 nsMenuFrame::RemoveFrame(ChildListID     aListID,
                          nsIFrame*       aOldFrame)
 {
   nsFrameList* popupList = GetPopupList();
   if (popupList && popupList->FirstChild() == aOldFrame) {
     popupList->RemoveFirstChild();
     aOldFrame->Destroy();
     DestroyPopupList();
     PresContext()->PresShell()->
       FrameNeedsReflow(this, nsIPresShell::eTreeChange,
                        NS_FRAME_HAS_DIRTY_CHILDREN);
     return NS_OK;
   }
   return nsBoxFrame::RemoveFrame(aListID, aOldFrame);
 }
 nsresult
 nsMenuFrame::InsertFrames(ChildListID     aListID,
                           nsIFrame*       aPrevFrame,
                           nsFrameList&    aFrameList)
 {
   if (!HasPopup() && (aListID == kPrincipalList || aListID == kPopupList)) {
     SetPopupFrame(aFrameList);
     if (HasPopup()) {
 #ifdef DEBUG_LAYOUT
       nsBoxLayoutState state(PresContext());
       SetDebug(state, aFrameList, mState & NS_STATE_CURRENTLY_IN_DEBUG);
 #endif
       PresContext()->PresShell()->
         FrameNeedsReflow(this, nsIPresShell::eTreeChange,
                          NS_FRAME_HAS_DIRTY_CHILDREN);
     }
   }
   if (aFrameList.IsEmpty())
     return NS_OK;
   if (MOZ_UNLIKELY(aPrevFrame && aPrevFrame == GetPopup())) {
     aPrevFrame = nullptr;
   }
   return nsBoxFrame::InsertFrames(aListID, aPrevFrame, aFrameList);
 }
 nsresult
 nsMenuFrame::AppendFrames(ChildListID     aListID,
                           nsFrameList&    aFrameList)
 {
   if (!HasPopup() && (aListID == kPrincipalList || aListID == kPopupList)) {
     SetPopupFrame(aFrameList);
     if (HasPopup()) {
 #ifdef DEBUG_LAYOUT
       nsBoxLayoutState state(PresContext());
       SetDebug(state, aFrameList, mState & NS_STATE_CURRENTLY_IN_DEBUG);
 #endif
       PresContext()->PresShell()->
         FrameNeedsReflow(this, nsIPresShell::eTreeChange,
                          NS_FRAME_HAS_DIRTY_CHILDREN);
     }
   }
   if (aFrameList.IsEmpty())
     return NS_OK;
   return nsBoxFrame::AppendFrames(aListID, aFrameList);
 }
 bool
 nsMenuFrame::SizeToPopup(nsBoxLayoutState& aState, nsSize& aSize)
 {
   if (!IsCollapsed()) {
     bool widthSet, heightSet;
     nsSize tmpSize(-1, 0);
     nsIFrame::AddCSSPrefSize(this, tmpSize, widthSet, heightSet);
     if (!widthSet && GetFlex(aState) == 0) {
       nsMenuPopupFrame* popupFrame = GetPopup();
       if (!popupFrame)
         return false;
       tmpSize = popupFrame->GetPrefSize(aState);
       // Produce a size such that:
       //  (1) the menu and its popup can be the same width
       //  (2) there's enough room in the menu for the content and its
       //      border-padding
       //  (3) there's enough room in the popup for the content and its
       //      scrollbar
       nsMargin borderPadding;
       GetBorderAndPadding(borderPadding);
       // if there is a scroll frame, add the desired width of the scrollbar as well
       nsIScrollableFrame* scrollFrame = do_QueryFrame(popupFrame->GetFirstPrincipalChild());
       nscoord scrollbarWidth = 0;
       if (scrollFrame) {
         scrollbarWidth =
           scrollFrame->GetDesiredScrollbarSizes(&aState).LeftRight();
       }
       aSize.width =
         tmpSize.width + std::max(borderPadding.LeftRight(), scrollbarWidth);
       return true;
     }
   }
   return false;
 }
 nsSize
 nsMenuFrame::GetPrefSize(nsBoxLayoutState& aState)
 {
   nsSize size = nsBoxFrame::GetPrefSize(aState);
   DISPLAY_PREF_SIZE(this, size);
   // If we are using sizetopopup="always" then
   // nsBoxFrame will already have enforced the minimum size
   if (!IsSizedToPopup(mContent, true) &&
       IsSizedToPopup(mContent, false) &&
       SizeToPopup(aState, size)) {
     // We now need to ensure that size is within the min - max range.
     nsSize minSize = nsBoxFrame::GetMinSize(aState);
     nsSize maxSize = GetMaxSize(aState);
     size = BoundsCheck(minSize, size, maxSize);
   }
   return size;
 }
 NS_IMETHODIMP
 nsMenuFrame::GetActiveChild(nsIDOMElement** aResult)
 {
   nsMenuPopupFrame* popupFrame = GetPopup();
   if (!popupFrame)
     return NS_ERROR_FAILURE;
   nsMenuFrame* menuFrame = popupFrame->GetCurrentMenuItem();
   if (!menuFrame) {
     *aResult = nullptr;
   }
   else {
     nsCOMPtr<nsIDOMElement> elt(do_QueryInterface(menuFrame->GetContent()));
     *aResult = elt;
     NS_IF_ADDREF(*aResult);
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 nsMenuFrame::SetActiveChild(nsIDOMElement* aChild)
 {
   nsMenuPopupFrame* popupFrame = GetPopup();
   if (!popupFrame)
     return NS_ERROR_FAILURE;
   if (!aChild) {
     // Remove the current selection
     popupFrame->ChangeMenuItem(nullptr, false);
     return NS_OK;
   }
   nsCOMPtr<nsIContent> child(do_QueryInterface(aChild));
   nsMenuFrame* menu = do_QueryFrame(child->GetPrimaryFrame());
   if (menu)
     popupFrame->ChangeMenuItem(menu, false);
   return NS_OK;
 }
 nsIScrollableFrame* nsMenuFrame::GetScrollTargetFrame()
 {
   nsMenuPopupFrame* popupFrame = GetPopup();
   if (!popupFrame)
     return nullptr;
   nsIFrame* childFrame = popupFrame->GetFirstPrincipalChild();
   if (childFrame)
     return popupFrame->GetScrollFrame(childFrame);
   return nullptr;
 }
 // nsMenuTimerMediator implementation.
 NS_IMPL_ISUPPORTS(nsMenuTimerMediator, nsITimerCallback)
 /**
  * Constructs a wrapper around an nsMenuFrame.
  * @param aFrame nsMenuFrame to create a wrapper around.
  */
 nsMenuTimerMediator::nsMenuTimerMediator(nsMenuFrame *aFrame) :
   mFrame(aFrame)
 {
   NS_ASSERTION(mFrame, "Must have frame");
 }
 nsMenuTimerMediator::~nsMenuTimerMediator()
 {
 }
 /**
  * Delegates the notification to the contained frame if it has not been destroyed.
  * @param aTimer Timer which initiated the callback.
  * @return NS_ERROR_FAILURE if the frame has been destroyed.
  */
 NS_IMETHODIMP nsMenuTimerMediator::Notify(nsITimer* aTimer)
 {
   if (!mFrame)
     return NS_ERROR_FAILURE;
   return mFrame->Notify(aTimer);
 }
 /**
  * Clear the pointer to the contained nsMenuFrame. This should be called
  * when the contained nsMenuFrame is destroyed.
  */
 void nsMenuTimerMediator::ClearFrame()
 {
   mFrame = nullptr;
 }

The Tor Browser / annotate

layout/xul/nsMenuFrame.cpp@97036ab72558 (annotated)

layout/xul/nsMenuFrame.cpp