/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=8 sts=2 et sw=2 tw=80: */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ /* * Base class for all element classes; this provides an implementation * of DOM Core's Element, implements nsIContent, provides * utility methods for subclasses, and so forth. */ #include "mozilla/dom/Element.h" #include "mozilla/dom/ElementInlines.h" #include #include #include #include "DOMIntersectionObserver.h" #include "DOMMatrix.h" #include "ExpandedPrincipal.h" #include "PresShellInlines.h" #include "jsapi.h" #include "mozAutoDocUpdate.h" #include "mozilla/AnimationComparator.h" #include "mozilla/AnimationTarget.h" #include "mozilla/AsyncEventDispatcher.h" #include "mozilla/CORSMode.h" #include "mozilla/Components.h" #include "mozilla/ComputedStyle.h" #include "mozilla/ContentEvents.h" #include "mozilla/DebugOnly.h" #include "mozilla/DeclarationBlock.h" #include "mozilla/EffectCompositor.h" #include "mozilla/EffectSet.h" #include "mozilla/ElementAnimationData.h" #include "mozilla/ErrorResult.h" #include "mozilla/EventDispatcher.h" #include "mozilla/EventListenerManager.h" #include "mozilla/EventStateManager.h" #include "mozilla/FloatingPoint.h" #include "mozilla/FullscreenChange.h" #include "mozilla/InternalMutationEvent.h" #include "mozilla/Likely.h" #include "mozilla/LinkedList.h" #include "mozilla/LookAndFeel.h" #include "mozilla/MouseEvents.h" #include "mozilla/NotNull.h" #include "mozilla/PointerLockManager.h" #include "mozilla/PresShell.h" #include "mozilla/PresShellForwards.h" #include "mozilla/ReflowOutput.h" #include "mozilla/RelativeTo.h" #include "mozilla/ScrollOrigin.h" #include "mozilla/ScrollTypes.h" #include "mozilla/ServoStyleConsts.h" #include "mozilla/ServoStyleConstsInlines.h" #include "mozilla/SizeOfState.h" #include "mozilla/StaticAnalysisFunctions.h" #include "mozilla/StaticPrefs_dom.h" #include "mozilla/StaticPrefs_full_screen_api.h" #include "mozilla/TextControlElement.h" #include "mozilla/TextEvents.h" #include "mozilla/TypedEnumBits.h" #include "mozilla/Unused.h" #include "mozilla/dom/AnimatableBinding.h" #include "mozilla/dom/Animation.h" #include "mozilla/dom/Attr.h" #include "mozilla/dom/BindContext.h" #include "mozilla/dom/BindingDeclarations.h" #include "mozilla/dom/CustomElementRegistry.h" #include "mozilla/dom/DOMRect.h" #include "mozilla/dom/DirectionalityUtils.h" #include "mozilla/dom/Document.h" #include "mozilla/dom/DocumentFragment.h" #include "mozilla/dom/DocumentInlines.h" #include "mozilla/dom/DocumentTimeline.h" #include "mozilla/dom/ElementBinding.h" #include "mozilla/dom/Flex.h" #include "mozilla/dom/FragmentOrElement.h" #include "mozilla/dom/FromParser.h" #include "mozilla/dom/Grid.h" #include "mozilla/dom/HTMLDivElement.h" #include "mozilla/dom/HTMLElement.h" #include "mozilla/dom/HTMLParagraphElement.h" #include "mozilla/dom/HTMLPreElement.h" #include "mozilla/dom/HTMLSpanElement.h" #include "mozilla/dom/HTMLTableCellElement.h" #include "mozilla/dom/HTMLTemplateElement.h" #include "mozilla/dom/KeyframeAnimationOptionsBinding.h" #include "mozilla/dom/KeyframeEffect.h" #include "mozilla/dom/MouseEvent.h" #include "mozilla/dom/MouseEventBinding.h" #include "mozilla/dom/MutationEventBinding.h" #include "mozilla/dom/MutationObservers.h" #include "mozilla/dom/NodeInfo.h" #include "mozilla/dom/PointerEventHandler.h" #include "mozilla/dom/Promise.h" #include "mozilla/dom/Sanitizer.h" #include "mozilla/dom/SVGElement.h" #include "mozilla/dom/ScriptLoader.h" #include "mozilla/dom/ShadowRoot.h" #include "mozilla/dom/Text.h" #include "mozilla/dom/WindowBinding.h" #include "mozilla/dom/XULCommandEvent.h" #include "mozilla/dom/nsCSPContext.h" #include "mozilla/gfx/BasePoint.h" #include "mozilla/gfx/BaseRect.h" #include "mozilla/gfx/BaseSize.h" #include "mozilla/gfx/Matrix.h" #include "nsAtom.h" #include "nsAttrName.h" #include "nsAttrValueInlines.h" #include "nsAttrValueOrString.h" #include "nsBaseHashtable.h" #include "nsBlockFrame.h" #include "nsCOMPtr.h" #include "nsContentUtils.h" #include "nsCSSPseudoElements.h" #include "nsCompatibility.h" #include "nsContainerFrame.h" #include "nsContentList.h" #include "nsContentListDeclarations.h" #include "nsCoord.h" #include "nsDOMAttributeMap.h" #include "nsDOMCSSAttrDeclaration.h" #include "nsDOMMutationObserver.h" #include "nsDOMString.h" #include "nsDOMStringMap.h" #include "nsDOMTokenList.h" #include "nsDocShell.h" #include "nsError.h" #include "nsFlexContainerFrame.h" #include "nsFocusManager.h" #include "nsFrameState.h" #include "nsGenericHTMLElement.h" #include "nsGkAtoms.h" #include "nsGridContainerFrame.h" #include "nsIAutoCompletePopup.h" #include "nsIBrowser.h" #include "nsIContentInlines.h" #include "nsIDOMXULButtonElement.h" #include "nsIDOMXULContainerElement.h" #include "nsIDOMXULControlElement.h" #include "nsIDOMXULMenuListElement.h" #include "nsIDOMXULMultSelectCntrlEl.h" #include "nsIDOMXULRadioGroupElement.h" #include "nsIDOMXULRelatedElement.h" #include "nsIDOMXULSelectCntrlEl.h" #include "nsIDOMXULSelectCntrlItemEl.h" #include "nsIDocShell.h" #include "nsIFocusManager.h" #include "nsIFrame.h" #include "nsIGlobalObject.h" #include "nsIIOService.h" #include "nsIInterfaceRequestor.h" #include "nsIMemoryReporter.h" #include "nsIPrincipal.h" #include "nsIScreenManager.h" #include "nsIScriptError.h" #include "nsIScrollableFrame.h" #include "nsISpeculativeConnect.h" #include "nsISupports.h" #include "nsISupportsUtils.h" #include "nsIURI.h" #include "nsLayoutUtils.h" #include "nsLineBox.h" #include "nsNameSpaceManager.h" #include "nsNodeInfoManager.h" #include "nsPIDOMWindow.h" #include "nsPoint.h" #include "nsPresContext.h" #include "nsQueryFrame.h" #include "nsRefPtrHashtable.h" #include "nsSize.h" #include "nsString.h" #include "nsStyleConsts.h" #include "nsStyleStruct.h" #include "nsStyledElement.h" #include "nsTArray.h" #include "nsTextNode.h" #include "nsThreadUtils.h" #include "nsViewManager.h" #include "nsWindowSizes.h" #include "nsXULElement.h" #ifdef DEBUG # include "nsRange.h" #endif #ifdef ACCESSIBILITY # include "nsAccessibilityService.h" #endif using mozilla::gfx::Matrix4x4; namespace mozilla::dom { // Verify sizes of nodes. We use a template rather than a direct static // assert so that the error message actually displays the sizes. // On 32 bit systems the actual allocated size varies a bit between // OSes/compilers. // // We need different numbers on certain build types to deal with the owning // thread pointer that comes with the non-threadsafe refcount on // nsIContent. #ifdef MOZ_THREAD_SAFETY_OWNERSHIP_CHECKS_SUPPORTED # define EXTRA_DOM_NODE_BYTES 8 #else # define EXTRA_DOM_NODE_BYTES 0 #endif #define ASSERT_NODE_SIZE(type, opt_size_64, opt_size_32) \ template \ struct Check##type##Size { \ static_assert((sizeof(void*) == 8 && a == sizeOn64) || \ (sizeof(void*) == 4 && a <= sizeOn32), \ "DOM size changed"); \ }; \ Check##type##Size \ g##type##CES; // Note that mozjemalloc uses a 16 byte quantum, so 64, 80 and 128 are // bucket sizes. ASSERT_NODE_SIZE(Element, 128, 80); ASSERT_NODE_SIZE(HTMLDivElement, 128, 80); ASSERT_NODE_SIZE(HTMLElement, 128, 80); ASSERT_NODE_SIZE(HTMLParagraphElement, 128, 80); ASSERT_NODE_SIZE(HTMLPreElement, 128, 80); ASSERT_NODE_SIZE(HTMLSpanElement, 128, 80); ASSERT_NODE_SIZE(HTMLTableCellElement, 128, 80); ASSERT_NODE_SIZE(Text, 120, 64); #undef ASSERT_NODE_SIZE #undef EXTRA_DOM_NODE_BYTES } // namespace mozilla::dom nsAtom* nsIContent::DoGetID() const { MOZ_ASSERT(HasID(), "Unexpected call"); MOZ_ASSERT(IsElement(), "Only elements can have IDs"); return AsElement()->GetParsedAttr(nsGkAtoms::id)->GetAtomValue(); } nsIFrame* nsIContent::GetPrimaryFrame(mozilla::FlushType aType) { Document* doc = GetComposedDoc(); if (!doc) { return nullptr; } // Cause a flush, so we get up-to-date frame information. if (aType != mozilla::FlushType::None) { doc->FlushPendingNotifications(aType); } auto* frame = GetPrimaryFrame(); if (!frame) { return nullptr; } if (aType == mozilla::FlushType::Layout) { frame->PresShell()->EnsureReflowIfFrameHasHiddenContent(frame); frame = GetPrimaryFrame(); } return frame; } namespace mozilla::dom { nsDOMAttributeMap* Element::Attributes() { nsDOMSlots* slots = DOMSlots(); if (!slots->mAttributeMap) { slots->mAttributeMap = new nsDOMAttributeMap(this); } return slots->mAttributeMap; } void Element::SetPointerCapture(int32_t aPointerId, ErrorResult& aError) { if (OwnerDoc()->ShouldResistFingerprinting(RFPTarget::Unknown) && aPointerId != PointerEventHandler::GetSpoofedPointerIdForRFP()) { aError.ThrowNotFoundError("Invalid pointer id"); return; } const PointerInfo* pointerInfo = PointerEventHandler::GetPointerInfo(aPointerId); if (!pointerInfo) { aError.ThrowNotFoundError("Invalid pointer id"); return; } if (!IsInComposedDoc()) { aError.Throw(NS_ERROR_DOM_INVALID_STATE_ERR); return; } if (OwnerDoc()->GetPointerLockElement()) { // Throw an exception 'InvalidStateError' while the page has a locked // element. aError.Throw(NS_ERROR_DOM_INVALID_STATE_ERR); return; } if (!pointerInfo->mActiveState || pointerInfo->mActiveDocument != OwnerDoc()) { return; } PointerEventHandler::RequestPointerCaptureById(aPointerId, this); } void Element::ReleasePointerCapture(int32_t aPointerId, ErrorResult& aError) { if (OwnerDoc()->ShouldResistFingerprinting(RFPTarget::Unknown) && aPointerId != PointerEventHandler::GetSpoofedPointerIdForRFP()) { aError.ThrowNotFoundError("Invalid pointer id"); return; } if (!PointerEventHandler::GetPointerInfo(aPointerId)) { aError.ThrowNotFoundError("Invalid pointer id"); return; } if (HasPointerCapture(aPointerId)) { PointerEventHandler::ReleasePointerCaptureById(aPointerId); } } bool Element::HasPointerCapture(long aPointerId) { PointerCaptureInfo* pointerCaptureInfo = PointerEventHandler::GetPointerCaptureInfo(aPointerId); if (pointerCaptureInfo && pointerCaptureInfo->mPendingElement == this) { return true; } return false; } const nsAttrValue* Element::GetSVGAnimatedClass() const { MOZ_ASSERT(MayHaveClass() && IsSVGElement(), "Unexpected call"); return static_cast(this)->GetAnimatedClassName(); } NS_IMETHODIMP Element::QueryInterface(REFNSIID aIID, void** aInstancePtr) { if (aIID.Equals(NS_GET_IID(Element))) { NS_ADDREF_THIS(); *aInstancePtr = this; return NS_OK; } NS_ASSERTION(aInstancePtr, "QueryInterface requires a non-NULL destination!"); nsresult rv = FragmentOrElement::QueryInterface(aIID, aInstancePtr); if (NS_SUCCEEDED(rv)) { return NS_OK; } return NS_NOINTERFACE; } ElementState Element::IntrinsicState() const { return IsEditable() ? ElementState::READWRITE : ElementState::READONLY; } void Element::NotifyStateChange(ElementState aStates) { if (aStates.IsEmpty()) { return; } if (Document* doc = GetComposedDoc()) { nsAutoScriptBlocker scriptBlocker; doc->ElementStateChanged(this, aStates); } } void Element::UpdateLinkState(ElementState aState) { MOZ_ASSERT(!aState.HasAtLeastOneOfStates(~ElementState::VISITED_OR_UNVISITED), "Unexpected link state bits"); mState = (mState & ~ElementState::VISITED_OR_UNVISITED) | aState; } void Element::UpdateState(bool aNotify) { ElementState oldState = mState; mState = IntrinsicState() | (oldState & ElementState::EXTERNALLY_MANAGED_STATES); if (aNotify) { ElementState changedStates = oldState ^ mState; if (!changedStates.IsEmpty()) { Document* doc = GetComposedDoc(); if (doc) { nsAutoScriptBlocker scriptBlocker; doc->ElementStateChanged(this, changedStates); } } } } } // namespace mozilla::dom void nsIContent::UpdateEditableState(bool aNotify) { if (IsInNativeAnonymousSubtree()) { // Don't propagate the editable flag into native anonymous subtrees. if (IsRootOfNativeAnonymousSubtree()) { return; } // We allow setting the flag on NAC (explicitly, see // nsTextControlFrame::CreateAnonymousContent for example), but not // unsetting it. // // Otherwise, just the act of binding the NAC subtree into our non-anonymous // parent would clear the flag, which is not good. As we shouldn't move NAC // around, this is fine. if (HasFlag(NODE_IS_EDITABLE)) { return; } } nsIContent* parent = GetParent(); SetEditableFlag(parent && parent->HasFlag(NODE_IS_EDITABLE)); } namespace mozilla::dom { void Element::UpdateEditableState(bool aNotify) { nsIContent::UpdateEditableState(aNotify); if (aNotify) { UpdateState(aNotify); } else { // Avoid calling UpdateState in this very common case, because // this gets called for pretty much every single element on // insertion into the document and UpdateState can be slow for // some kinds of elements even when not notifying. if (IsEditable()) { RemoveStatesSilently(ElementState::READONLY); AddStatesSilently(ElementState::READWRITE); } else { RemoveStatesSilently(ElementState::READWRITE); AddStatesSilently(ElementState::READONLY); } } } Maybe Element::GetTabIndexAttrValue() { const nsAttrValue* attrVal = GetParsedAttr(nsGkAtoms::tabindex); if (attrVal && attrVal->Type() == nsAttrValue::eInteger) { return Some(attrVal->GetIntegerValue()); } return Nothing(); } int32_t Element::TabIndex() { Maybe attrVal = GetTabIndexAttrValue(); if (attrVal.isSome()) { return attrVal.value(); } return TabIndexDefault(); } void Element::Focus(const FocusOptions& aOptions, CallerType aCallerType, ErrorResult& aError) { const RefPtr fm = nsFocusManager::GetFocusManager(); if (MOZ_UNLIKELY(!fm)) { return; } const OwningNonNull kungFuDeathGrip(*this); // Also other browsers seem to have the hack to not re-focus (and flush) when // the element is already focused. // Until https://github.com/whatwg/html/issues/4512 is clarified, we'll // maintain interoperatibility by not re-focusing, independent of aOptions. // I.e., `focus({ preventScroll: true})` followed by `focus( { preventScroll: // false })` won't re-focus. if (fm->CanSkipFocus(this)) { fm->NotifyOfReFocus(kungFuDeathGrip); fm->NeedsFlushBeforeEventHandling(this); return; } uint32_t fmFlags = nsFocusManager::ProgrammaticFocusFlags(aOptions); if (aCallerType == CallerType::NonSystem) { fmFlags |= nsIFocusManager::FLAG_NONSYSTEMCALLER; } aError = fm->SetFocus(kungFuDeathGrip, fmFlags); } void Element::SetTabIndex(int32_t aTabIndex, mozilla::ErrorResult& aError) { nsAutoString value; value.AppendInt(aTabIndex); SetAttr(nsGkAtoms::tabindex, value, aError); } void Element::SetShadowRoot(ShadowRoot* aShadowRoot) { nsExtendedDOMSlots* slots = ExtendedDOMSlots(); MOZ_ASSERT(!aShadowRoot || !slots->mShadowRoot, "We shouldn't clear the shadow root without unbind first"); slots->mShadowRoot = aShadowRoot; } void Element::SetLastRememberedBSize(float aBSize) { ExtendedDOMSlots()->mLastRememberedBSize = Some(aBSize); } void Element::SetLastRememberedISize(float aISize) { ExtendedDOMSlots()->mLastRememberedISize = Some(aISize); } void Element::RemoveLastRememberedBSize() { if (nsExtendedDOMSlots* slots = GetExistingExtendedDOMSlots()) { slots->mLastRememberedBSize.reset(); } } void Element::RemoveLastRememberedISize() { if (nsExtendedDOMSlots* slots = GetExistingExtendedDOMSlots()) { slots->mLastRememberedISize.reset(); } } void Element::Blur(mozilla::ErrorResult& aError) { if (!ShouldBlur(this)) { return; } Document* doc = GetComposedDoc(); if (!doc) { return; } if (nsCOMPtr win = doc->GetWindow()) { if (RefPtr fm = nsFocusManager::GetFocusManager()) { aError = fm->ClearFocus(win); } } } ElementState Element::StyleStateFromLocks() const { StyleStateLocks locksAndValues = LockedStyleStates(); ElementState locks = locksAndValues.mLocks; ElementState values = locksAndValues.mValues; ElementState state = (mState & ~locks) | (locks & values); if (state.HasState(ElementState::VISITED)) { return state & ~ElementState::UNVISITED; } if (state.HasState(ElementState::UNVISITED)) { return state & ~ElementState::VISITED; } return state; } Element::StyleStateLocks Element::LockedStyleStates() const { StyleStateLocks* locks = static_cast(GetProperty(nsGkAtoms::lockedStyleStates)); if (locks) { return *locks; } return StyleStateLocks(); } void Element::NotifyStyleStateChange(ElementState aStates) { if (RefPtr doc = GetComposedDoc()) { if (RefPtr presShell = doc->GetPresShell()) { nsAutoScriptBlocker scriptBlocker; presShell->ElementStateChanged(doc, this, aStates); } } } void Element::LockStyleStates(ElementState aStates, bool aEnabled) { StyleStateLocks* locks = new StyleStateLocks(LockedStyleStates()); locks->mLocks |= aStates; if (aEnabled) { locks->mValues |= aStates; } else { locks->mValues &= ~aStates; } if (aStates.HasState(ElementState::VISITED)) { locks->mLocks &= ~ElementState::UNVISITED; } if (aStates.HasState(ElementState::UNVISITED)) { locks->mLocks &= ~ElementState::VISITED; } SetProperty(nsGkAtoms::lockedStyleStates, locks, nsINode::DeleteProperty); SetHasLockedStyleStates(); NotifyStyleStateChange(aStates); } void Element::UnlockStyleStates(ElementState aStates) { StyleStateLocks* locks = new StyleStateLocks(LockedStyleStates()); locks->mLocks &= ~aStates; if (locks->mLocks.IsEmpty()) { RemoveProperty(nsGkAtoms::lockedStyleStates); ClearHasLockedStyleStates(); delete locks; } else { SetProperty(nsGkAtoms::lockedStyleStates, locks, nsINode::DeleteProperty); } NotifyStyleStateChange(aStates); } void Element::ClearStyleStateLocks() { StyleStateLocks locks = LockedStyleStates(); RemoveProperty(nsGkAtoms::lockedStyleStates); ClearHasLockedStyleStates(); NotifyStyleStateChange(locks.mLocks); } /* virtual */ nsINode* Element::GetScopeChainParent() const { return OwnerDoc(); } nsDOMTokenList* Element::ClassList() { Element::nsDOMSlots* slots = DOMSlots(); if (!slots->mClassList) { slots->mClassList = new nsDOMTokenList(this, nsGkAtoms::_class); } return slots->mClassList; } nsDOMTokenList* Element::Part() { Element::nsDOMSlots* slots = DOMSlots(); if (!slots->mPart) { slots->mPart = new nsDOMTokenList(this, nsGkAtoms::part); } return slots->mPart; } void Element::RecompileScriptEventListeners() { for (uint32_t i = 0, count = mAttrs.AttrCount(); i < count; ++i) { BorrowedAttrInfo attrInfo = mAttrs.AttrInfoAt(i); // Eventlistenener-attributes are always in the null namespace if (!attrInfo.mName->IsAtom()) { continue; } nsAtom* attr = attrInfo.mName->Atom(); if (!IsEventAttributeName(attr)) { continue; } nsAutoString value; attrInfo.mValue->ToString(value); SetEventHandler(GetEventNameForAttr(attr), value, true); } } void Element::GetAttributeNames(nsTArray& aResult) { uint32_t count = mAttrs.AttrCount(); for (uint32_t i = 0; i < count; ++i) { const nsAttrName* name = mAttrs.AttrNameAt(i); name->GetQualifiedName(*aResult.AppendElement()); } } already_AddRefed Element::GetElementsByTagName( const nsAString& aLocalName) { return NS_GetContentList(this, kNameSpaceID_Unknown, aLocalName); } nsIScrollableFrame* Element::GetScrollFrame(nsIFrame** aFrame, FlushType aFlushType) { nsIFrame* frame = GetPrimaryFrame(aFlushType); if (aFrame) { *aFrame = frame; } if (frame) { if (frame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT)) { // It's unclear what to return for SVG frames, so just return null. return nullptr; } if (nsIScrollableFrame* scrollFrame = frame->GetScrollTargetFrame()) { MOZ_ASSERT(!OwnerDoc()->IsScrollingElement(this), "How can we have a scrollframe if we're the " "scrollingElement for our document?"); return scrollFrame; } } Document* doc = OwnerDoc(); // Note: This IsScrollingElement() call can flush frames, if we're the body of // a quirks mode document. bool isScrollingElement = doc->IsScrollingElement(this); // Now reget *aStyledFrame if the caller asked for it, because that frame // flush can kill it. if (aFrame) { *aFrame = GetPrimaryFrame(FlushType::None); } if (isScrollingElement) { // Our scroll info should map to the root scrollable frame if there is one. if (PresShell* presShell = doc->GetPresShell()) { return presShell->GetRootScrollFrameAsScrollable(); } } return nullptr; } bool Element::CheckVisibility(const CheckVisibilityOptions& aOptions) { nsIFrame* f = GetPrimaryFrame(aOptions.mFlush ? FlushType::Frames : FlushType::None); if (!f) { // 1. If this does not have an associated box, return false. return false; } if (f->IsHiddenByContentVisibilityOnAnyAncestor( nsIFrame::IncludeContentVisibility::Hidden)) { // 2. If a shadow-including ancestor of this has content-visibility: hidden, // return false. return false; } if (aOptions.mCheckOpacity && f->Style()->IsInOpacityZeroSubtree()) { // 3. If the checkOpacity dictionary member of options is true, and this, or // a shadow-including ancestor of this, has a computed opacity value of 0, // return false. return false; } if (aOptions.mCheckVisibilityCSS && !f->StyleVisibility()->IsVisible()) { // 4. If the checkVisibilityCSS dictionary member of options is true, and // this is invisible, return false. return false; } // 5. Return true return true; } void Element::ScrollIntoView(const BooleanOrScrollIntoViewOptions& aObject) { if (aObject.IsScrollIntoViewOptions()) { return ScrollIntoView(aObject.GetAsScrollIntoViewOptions()); } MOZ_DIAGNOSTIC_ASSERT(aObject.IsBoolean()); ScrollIntoViewOptions options; if (aObject.GetAsBoolean()) { options.mBlock = ScrollLogicalPosition::Start; options.mInline = ScrollLogicalPosition::Nearest; } else { options.mBlock = ScrollLogicalPosition::End; options.mInline = ScrollLogicalPosition::Nearest; } return ScrollIntoView(options); } void Element::ScrollIntoView(const ScrollIntoViewOptions& aOptions) { Document* document = GetComposedDoc(); if (!document) { return; } // Get the presentation shell RefPtr presShell = document->GetPresShell(); if (!presShell) { return; } const auto ToWhereToScroll = [](ScrollLogicalPosition aPosition) -> WhereToScroll { switch (aPosition) { case ScrollLogicalPosition::Start: return WhereToScroll::Start; case ScrollLogicalPosition::Center: return WhereToScroll::Center; case ScrollLogicalPosition::End: return WhereToScroll::End; case ScrollLogicalPosition::EndGuard_: MOZ_FALLTHROUGH_ASSERT("Unexpected block direction value"); case ScrollLogicalPosition::Nearest: break; } return WhereToScroll::Nearest; }; const auto block = ToWhereToScroll(aOptions.mBlock); const auto inline_ = ToWhereToScroll(aOptions.mInline); ScrollFlags scrollFlags = ScrollFlags::ScrollOverflowHidden | ScrollFlags::TriggeredByScript; if (aOptions.mBehavior == ScrollBehavior::Smooth) { scrollFlags |= ScrollFlags::ScrollSmooth; } else if (aOptions.mBehavior == ScrollBehavior::Auto) { scrollFlags |= ScrollFlags::ScrollSmoothAuto; } // TODO: Propagate whether the axes are logical or not down (via scrollflags). presShell->ScrollContentIntoView( this, ScrollAxis(block, WhenToScroll::Always), ScrollAxis(inline_, WhenToScroll::Always), scrollFlags); } void Element::Scroll(const CSSIntPoint& aScroll, const ScrollOptions& aOptions) { nsIScrollableFrame* sf = GetScrollFrame(); if (sf) { ScrollMode scrollMode = sf->IsSmoothScroll(aOptions.mBehavior) ? ScrollMode::SmoothMsd : ScrollMode::Instant; sf->ScrollToCSSPixels(aScroll, scrollMode); } } void Element::Scroll(double aXScroll, double aYScroll) { // Convert -Inf, Inf, and NaN to 0; otherwise, convert by C-style cast. auto scrollPos = CSSIntPoint::Truncate(mozilla::ToZeroIfNonfinite(aXScroll), mozilla::ToZeroIfNonfinite(aYScroll)); Scroll(scrollPos, ScrollOptions()); } void Element::Scroll(const ScrollToOptions& aOptions) { nsIScrollableFrame* sf = GetScrollFrame(); if (sf) { CSSIntPoint scrollPos = sf->GetScrollPositionCSSPixels(); if (aOptions.mLeft.WasPassed()) { scrollPos.x = mozilla::ToZeroIfNonfinite(aOptions.mLeft.Value()); } if (aOptions.mTop.WasPassed()) { scrollPos.y = mozilla::ToZeroIfNonfinite(aOptions.mTop.Value()); } Scroll(scrollPos, aOptions); } } void Element::ScrollTo(double aXScroll, double aYScroll) { Scroll(aXScroll, aYScroll); } void Element::ScrollTo(const ScrollToOptions& aOptions) { Scroll(aOptions); } void Element::ScrollBy(double aXScrollDif, double aYScrollDif) { nsIScrollableFrame* sf = GetScrollFrame(); if (sf) { ScrollToOptions options; options.mLeft.Construct(aXScrollDif); options.mTop.Construct(aYScrollDif); ScrollBy(options); } } void Element::ScrollBy(const ScrollToOptions& aOptions) { nsIScrollableFrame* sf = GetScrollFrame(); if (sf) { CSSIntPoint scrollDelta; if (aOptions.mLeft.WasPassed()) { scrollDelta.x = mozilla::ToZeroIfNonfinite(aOptions.mLeft.Value()); } if (aOptions.mTop.WasPassed()) { scrollDelta.y = mozilla::ToZeroIfNonfinite(aOptions.mTop.Value()); } ScrollMode scrollMode = sf->IsSmoothScroll(aOptions.mBehavior) ? ScrollMode::SmoothMsd : ScrollMode::Instant; sf->ScrollByCSSPixels(scrollDelta, scrollMode); } } int32_t Element::ScrollTop() { nsIScrollableFrame* sf = GetScrollFrame(); return sf ? sf->GetScrollPositionCSSPixels().y.value : 0; } void Element::SetScrollTop(int32_t aScrollTop) { // When aScrollTop is 0, we don't need to flush layout to scroll to that // point; we know 0 is always in range. At least we think so... But we do // need to flush frames so we ensure we find the right scrollable frame if // there is one. // // If aScrollTop is nonzero, we need to flush layout because we need to figure // out what our real scrollTopMax is. FlushType flushType = aScrollTop == 0 ? FlushType::Frames : FlushType::Layout; nsIScrollableFrame* sf = GetScrollFrame(nullptr, flushType); if (sf) { ScrollMode scrollMode = sf->IsSmoothScroll() ? ScrollMode::SmoothMsd : ScrollMode::Instant; sf->ScrollToCSSPixels( CSSIntPoint(sf->GetScrollPositionCSSPixels().x, aScrollTop), scrollMode); } } int32_t Element::ScrollLeft() { nsIScrollableFrame* sf = GetScrollFrame(); return sf ? sf->GetScrollPositionCSSPixels().x.value : 0; } void Element::SetScrollLeft(int32_t aScrollLeft) { // We can't assume things here based on the value of aScrollLeft, because // depending on our direction and layout 0 may or may not be in our scroll // range. So we need to flush layout no matter what. nsIScrollableFrame* sf = GetScrollFrame(); if (sf) { ScrollMode scrollMode = sf->IsSmoothScroll() ? ScrollMode::SmoothMsd : ScrollMode::Instant; sf->ScrollToCSSPixels( CSSIntPoint(aScrollLeft, sf->GetScrollPositionCSSPixels().y), scrollMode); } } void Element::MozScrollSnap() { nsIScrollableFrame* sf = GetScrollFrame(nullptr, FlushType::None); if (sf) { sf->ScrollSnap(); } } int32_t Element::ScrollTopMin() { nsIScrollableFrame* sf = GetScrollFrame(); if (!sf) { return 0; } return CSSPixel::FromAppUnits(sf->GetScrollRange().y).Rounded(); } int32_t Element::ScrollTopMax() { nsIScrollableFrame* sf = GetScrollFrame(); if (!sf) { return 0; } return CSSPixel::FromAppUnits(sf->GetScrollRange().YMost()).Rounded(); } int32_t Element::ScrollLeftMin() { nsIScrollableFrame* sf = GetScrollFrame(); if (!sf) { return 0; } return CSSPixel::FromAppUnits(sf->GetScrollRange().x).Rounded(); } int32_t Element::ScrollLeftMax() { nsIScrollableFrame* sf = GetScrollFrame(); if (!sf) { return 0; } return CSSPixel::FromAppUnits(sf->GetScrollRange().XMost()).Rounded(); } static nsSize GetScrollRectSizeForOverflowVisibleFrame(nsIFrame* aFrame) { if (!aFrame || aFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT)) { return nsSize(0, 0); } nsRect paddingRect = aFrame->GetPaddingRectRelativeToSelf(); OverflowAreas overflowAreas(paddingRect, paddingRect); // Add the scrollable overflow areas of children (if any) to the paddingRect. // It's important to start with the paddingRect, otherwise if there are no // children the overflow rect will be 0,0,0,0 which will force the point 0,0 // to be included in the final rect. nsLayoutUtils::UnionChildOverflow(aFrame, overflowAreas); // Make sure that an empty padding-rect's edges are included, by adding // the padding-rect in again with UnionEdges. nsRect overflowRect = overflowAreas.ScrollableOverflow().UnionEdges(paddingRect); return nsLayoutUtils::GetScrolledRect(aFrame, overflowRect, paddingRect.Size(), aFrame->StyleVisibility()->mDirection) .Size(); } int32_t Element::ScrollHeight() { nsIFrame* frame; nsIScrollableFrame* sf = GetScrollFrame(&frame); nscoord height; if (sf) { height = sf->GetScrollRange().Height() + sf->GetScrollPortRect().Height(); } else { height = GetScrollRectSizeForOverflowVisibleFrame(frame).height; } return nsPresContext::AppUnitsToIntCSSPixels(height); } int32_t Element::ScrollWidth() { nsIFrame* frame; nsIScrollableFrame* sf = GetScrollFrame(&frame); nscoord width; if (sf) { width = sf->GetScrollRange().Width() + sf->GetScrollPortRect().Width(); } else { width = GetScrollRectSizeForOverflowVisibleFrame(frame).width; } return nsPresContext::AppUnitsToIntCSSPixels(width); } nsRect Element::GetClientAreaRect() { Document* doc = OwnerDoc(); nsPresContext* presContext = doc->GetPresContext(); // We can avoid a layout flush if this is the scrolling element of the // document, we have overlay scrollbars, and we aren't embedded in another // document if (presContext && presContext->UseOverlayScrollbars() && !doc->StyleOrLayoutObservablyDependsOnParentDocumentLayout() && doc->IsScrollingElement(this)) { if (PresShell* presShell = doc->GetPresShell()) { // Ensure up to date dimensions, but don't reflow if (RefPtr viewManager = presShell->GetViewManager()) { viewManager->FlushDelayedResize(); } return nsRect(nsPoint(), presContext->GetVisibleArea().Size()); } } nsIFrame* frame; if (nsIScrollableFrame* sf = GetScrollFrame(&frame)) { nsRect scrollPort = sf->GetScrollPortRect(); if (!sf->IsRootScrollFrameOfDocument()) { MOZ_ASSERT(frame); nsIFrame* scrollableAsFrame = do_QueryFrame(sf); // We want the offset to be relative to `frame`, not `sf`... Except for // the root scroll frame, which is an ancestor of frame rather than a // descendant and thus this wouldn't particularly make sense. if (frame != scrollableAsFrame) { scrollPort.MoveBy(scrollableAsFrame->GetOffsetTo(frame)); } } // The scroll port value might be expanded to the minimum scale size, we // should limit the size to the ICB in such cases. scrollPort.SizeTo(sf->GetLayoutSize()); return scrollPort; } if (frame && // The display check is OK even though we're not looking at the style // frame, because the style frame only differs from "frame" for tables, // and table wrappers have the same display as the table itself. (!frame->StyleDisplay()->IsInlineFlow() || frame->IsFrameOfType(nsIFrame::eReplaced))) { // Special case code to make client area work even when there isn't // a scroll view, see bug 180552, bug 227567. return frame->GetPaddingRect() - frame->GetPositionIgnoringScrolling(); } // SVG nodes reach here and just return 0 return nsRect(0, 0, 0, 0); } int32_t Element::ScreenX() { nsIFrame* frame = GetPrimaryFrame(FlushType::Layout); return frame ? frame->GetScreenRect().x : 0; } int32_t Element::ScreenY() { nsIFrame* frame = GetPrimaryFrame(FlushType::Layout); return frame ? frame->GetScreenRect().y : 0; } already_AddRefed Element::GetScreen() { nsIFrame* frame = GetPrimaryFrame(FlushType::Layout); if (!frame) { return nullptr; } nsCOMPtr screenMgr = do_GetService("@mozilla.org/gfx/screenmanager;1"); if (!screenMgr) { return nullptr; } nsPresContext* pc = frame->PresContext(); const CSSIntRect rect = frame->GetScreenRect(); DesktopRect desktopRect = rect * pc->CSSToDevPixelScale() / pc->DeviceContext()->GetDesktopToDeviceScale(); return screenMgr->ScreenForRect(DesktopIntRect::Round(desktopRect)); } already_AddRefed Element::GetBoundingClientRect() { RefPtr rect = new DOMRect(ToSupports(OwnerDoc())); nsIFrame* frame = GetPrimaryFrame(FlushType::Layout); if (!frame) { // display:none, perhaps? Return the empty rect return rect.forget(); } rect->SetLayoutRect(frame->GetBoundingClientRect()); return rect.forget(); } already_AddRefed Element::GetClientRects() { RefPtr rectList = new DOMRectList(this); nsIFrame* frame = GetPrimaryFrame(FlushType::Layout); if (!frame) { // display:none, perhaps? Return an empty list return rectList.forget(); } nsLayoutUtils::RectListBuilder builder(rectList); nsLayoutUtils::GetAllInFlowRects( frame, nsLayoutUtils::GetContainingBlockForClientRect(frame), &builder, nsLayoutUtils::RECTS_ACCOUNT_FOR_TRANSFORMS); return rectList.forget(); } //---------------------------------------------------------------------- void Element::AddToIdTable(nsAtom* aId) { NS_ASSERTION(HasID(), "Node doesn't have an ID?"); if (IsInShadowTree()) { ShadowRoot* containingShadow = GetContainingShadow(); containingShadow->AddToIdTable(this, aId); } else { Document* doc = GetUncomposedDoc(); if (doc && !IsInNativeAnonymousSubtree()) { doc->AddToIdTable(this, aId); } } } void Element::RemoveFromIdTable() { if (!HasID()) { return; } nsAtom* id = DoGetID(); if (IsInShadowTree()) { ShadowRoot* containingShadow = GetContainingShadow(); // Check for containingShadow because it may have // been deleted during unlinking. if (containingShadow) { containingShadow->RemoveFromIdTable(this, id); } } else { Document* doc = GetUncomposedDoc(); if (doc && !IsInNativeAnonymousSubtree()) { doc->RemoveFromIdTable(this, id); } } } void Element::SetSlot(const nsAString& aName, ErrorResult& aError) { aError = SetAttr(kNameSpaceID_None, nsGkAtoms::slot, aName, true); } void Element::GetSlot(nsAString& aName) { GetAttr(kNameSpaceID_None, nsGkAtoms::slot, aName); } // https://dom.spec.whatwg.org/#dom-element-shadowroot ShadowRoot* Element::GetShadowRootByMode() const { /** * 1. Let shadow be context object's shadow root. * 2. If shadow is null or its mode is "closed", then return null. */ ShadowRoot* shadowRoot = GetShadowRoot(); if (!shadowRoot || shadowRoot->IsClosed()) { return nullptr; } /** * 3. Return shadow. */ return shadowRoot; } bool Element::CanAttachShadowDOM() const { /** * If context object's namespace is not the HTML namespace, * return false. * * Deviate from the spec here to allow shadow dom attachement to * XUL elements. */ if (!IsHTMLElement() && !(IsXULElement() && nsContentUtils::AllowXULXBLForPrincipal(NodePrincipal()))) { return false; } /** * If context object's local name is not * a valid custom element name, "article", "aside", "blockquote", * "body", "div", "footer", "h1", "h2", "h3", "h4", "h5", "h6", * "header", "main" "nav", "p", "section", or "span", * return false. */ nsAtom* nameAtom = NodeInfo()->NameAtom(); uint32_t namespaceID = NodeInfo()->NamespaceID(); if (!(nsContentUtils::IsCustomElementName(nameAtom, namespaceID) || nameAtom == nsGkAtoms::article || nameAtom == nsGkAtoms::aside || nameAtom == nsGkAtoms::blockquote || nameAtom == nsGkAtoms::body || nameAtom == nsGkAtoms::div || nameAtom == nsGkAtoms::footer || nameAtom == nsGkAtoms::h1 || nameAtom == nsGkAtoms::h2 || nameAtom == nsGkAtoms::h3 || nameAtom == nsGkAtoms::h4 || nameAtom == nsGkAtoms::h5 || nameAtom == nsGkAtoms::h6 || nameAtom == nsGkAtoms::header || nameAtom == nsGkAtoms::main || nameAtom == nsGkAtoms::nav || nameAtom == nsGkAtoms::p || nameAtom == nsGkAtoms::section || nameAtom == nsGkAtoms::span)) { return false; } /** * 3. If context object’s local name is a valid custom element name, or * context object’s is value is not null, then: * If definition is not null and definition’s disable shadow is true, then * return false. */ // It will always have CustomElementData when the element is a valid custom // element or has is value. if (CustomElementData* ceData = GetCustomElementData()) { CustomElementDefinition* definition = ceData->GetCustomElementDefinition(); // If the definition is null, the element possible hasn't yet upgraded. // Fallback to use LookupCustomElementDefinition to find its definition. if (!definition) { definition = nsContentUtils::LookupCustomElementDefinition( NodeInfo()->GetDocument(), nameAtom, namespaceID, ceData->GetCustomElementType()); } if (definition && definition->mDisableShadow) { return false; } } return true; } // https://dom.spec.whatwg.org/commit-snapshots/1eadf0a4a271acc92013d1c0de8c730ac96204f9/#dom-element-attachshadow already_AddRefed Element::AttachShadow(const ShadowRootInit& aInit, ErrorResult& aError) { /** * Step 1, 2, and 3. */ if (!CanAttachShadowDOM()) { aError.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR); return nullptr; } /** * 4. If this is a shadow host, then throw a "NotSupportedError" DOMException. */ if (GetShadowRoot()) { aError.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR); return nullptr; } if (StaticPrefs::dom_webcomponents_shadowdom_report_usage()) { OwnerDoc()->ReportShadowDOMUsage(); } return AttachShadowWithoutNameChecks(aInit.mMode, DelegatesFocus(aInit.mDelegatesFocus), aInit.mSlotAssignment); } already_AddRefed Element::AttachShadowWithoutNameChecks( ShadowRootMode aMode, DelegatesFocus aDelegatesFocus, SlotAssignmentMode aSlotAssignment) { nsAutoScriptBlocker scriptBlocker; auto* nim = mNodeInfo->NodeInfoManager(); RefPtr nodeInfo = nim->GetNodeInfo(nsGkAtoms::documentFragmentNodeName, nullptr, kNameSpaceID_None, DOCUMENT_FRAGMENT_NODE); // If there are no children, the flat tree is not changing due to the presence // of the shadow root, so we don't need to invalidate style / layout. // // This is a minor optimization, but also works around nasty stuff like // bug 1397876. if (Document* doc = GetComposedDoc()) { if (PresShell* presShell = doc->GetPresShell()) { presShell->ShadowRootWillBeAttached(*this); } } /** * 5. Let shadow be a new shadow root whose node document is * context object's node document, host is context object, * and mode is init's mode. */ RefPtr shadowRoot = new (nim) ShadowRoot( this, aMode, aDelegatesFocus, aSlotAssignment, nodeInfo.forget()); if (NodeOrAncestorHasDirAuto()) { shadowRoot->SetAncestorHasDirAuto(); } /** * 7. If this’s custom element state is "precustomized" or "custom", then set * shadow’s available to element internals to true. */ CustomElementData* ceData = GetCustomElementData(); if (ceData && (ceData->mState == CustomElementData::State::ePrecustomized || ceData->mState == CustomElementData::State::eCustom)) { shadowRoot->SetAvailableToElementInternals(); } /** * 9. Set context object's shadow root to shadow. */ SetShadowRoot(shadowRoot); // Dispatch a "shadowrootattached" event for devtools if needed. if (MOZ_UNLIKELY( nim->GetDocument()->DevToolsAnonymousAndShadowEventsEnabled())) { AsyncEventDispatcher* dispatcher = new AsyncEventDispatcher( this, u"shadowrootattached"_ns, CanBubble::eYes, ChromeOnlyDispatch::eYes, Composed::eYes); dispatcher->PostDOMEvent(); } /** * 10. Return shadow. */ return shadowRoot.forget(); } void Element::AttachAndSetUAShadowRoot(NotifyUAWidgetSetup aNotify, DelegatesFocus aDelegatesFocus) { MOZ_DIAGNOSTIC_ASSERT(!CanAttachShadowDOM(), "Cannot be used to attach UI shadow DOM"); if (OwnerDoc()->IsStaticDocument()) { return; } if (!GetShadowRoot()) { RefPtr shadowRoot = AttachShadowWithoutNameChecks(ShadowRootMode::Closed, aDelegatesFocus); shadowRoot->SetIsUAWidget(); } MOZ_ASSERT(GetShadowRoot()->IsUAWidget()); if (aNotify == NotifyUAWidgetSetup::Yes) { NotifyUAWidgetSetupOrChange(); } } void Element::NotifyUAWidgetSetupOrChange() { MOZ_ASSERT(IsInComposedDoc()); Document* doc = OwnerDoc(); if (doc->IsStaticDocument()) { return; } // Schedule a runnable, ensure the event dispatches before // returning to content script. // This event cause UA Widget to construct or cause onchange callback // of existing UA Widget to run; dispatching this event twice should not cause // UA Widget to re-init. nsContentUtils::AddScriptRunner(NS_NewRunnableFunction( "Element::NotifyUAWidgetSetupOrChange::UAWidgetSetupOrChange", [self = RefPtr(this), doc = RefPtr(doc)]() { nsContentUtils::DispatchChromeEvent(doc, self, u"UAWidgetSetupOrChange"_ns, CanBubble::eYes, Cancelable::eNo); })); } void Element::NotifyUAWidgetTeardown(UnattachShadowRoot aUnattachShadowRoot) { MOZ_ASSERT(IsInComposedDoc()); if (!GetShadowRoot()) { return; } MOZ_ASSERT(GetShadowRoot()->IsUAWidget()); if (aUnattachShadowRoot == UnattachShadowRoot::Yes) { UnattachShadow(); } Document* doc = OwnerDoc(); if (doc->IsStaticDocument()) { return; } // The runnable will dispatch an event to tear down UA Widget. nsContentUtils::AddScriptRunner(NS_NewRunnableFunction( "Element::NotifyUAWidgetTeardownAndUnattachShadow::UAWidgetTeardown", [self = RefPtr(this), doc = RefPtr(doc)]() { // Bail out if the element is being collected by CC bool hasHadScriptObject = true; nsIScriptGlobalObject* scriptObject = doc->GetScriptHandlingObject(hasHadScriptObject); if (!scriptObject && hasHadScriptObject) { return; } Unused << nsContentUtils::DispatchChromeEvent( doc, self, u"UAWidgetTeardown"_ns, CanBubble::eYes, Cancelable::eNo); })); } void Element::UnattachShadow() { RefPtr shadowRoot = GetShadowRoot(); if (!shadowRoot) { return; } nsAutoScriptBlocker scriptBlocker; if (RefPtr doc = GetComposedDoc()) { if (PresShell* presShell = doc->GetPresShell()) { presShell->DestroyFramesForAndRestyle(this); #ifdef ACCESSIBILITY // We need to notify the accessibility service here explicitly because, // even though we're going to reconstruct the _host_, the shadow root and // its children are never really going to come back. We could plumb that // further down to DestroyFramesForAndRestyle and add a new flag to // nsCSSFrameConstructor::ContentRemoved or such, but this seems simpler // instead. if (nsAccessibilityService* accService = GetAccService()) { accService->ContentRemoved(presShell, shadowRoot); } #endif } // ContentRemoved doesn't really run script in the cases we care about (it // can only call ClearFocus when removing iframes and so on...) [&]() MOZ_CAN_RUN_SCRIPT_BOUNDARY { if (RefPtr fm = nsFocusManager::GetFocusManager()) { fm->ContentRemoved(doc, shadowRoot); } }(); } MOZ_ASSERT(!GetPrimaryFrame()); shadowRoot->Unattach(); SetShadowRoot(nullptr); } void Element::GetAttribute(const nsAString& aName, DOMString& aReturn) { const nsAttrValue* val = mAttrs.GetAttr( aName, IsHTMLElement() && IsInHTMLDocument() ? eIgnoreCase : eCaseMatters); if (val) { val->ToString(aReturn); } else { if (IsXULElement()) { // XXX should be SetDOMStringToNull(aReturn); // See bug 232598 // aReturn is already empty } else { aReturn.SetNull(); } } } bool Element::ToggleAttribute(const nsAString& aName, const Optional& aForce, nsIPrincipal* aTriggeringPrincipal, ErrorResult& aError) { aError = nsContentUtils::CheckQName(aName, false); if (aError.Failed()) { return false; } nsAutoString nameToUse; const nsAttrName* name = InternalGetAttrNameFromQName(aName, &nameToUse); if (!name) { if (aForce.WasPassed() && !aForce.Value()) { return false; } RefPtr nameAtom = NS_AtomizeMainThread(nameToUse); if (!nameAtom) { aError.Throw(NS_ERROR_OUT_OF_MEMORY); return false; } aError = SetAttr(kNameSpaceID_None, nameAtom, u""_ns, aTriggeringPrincipal, true); return true; } if (aForce.WasPassed() && aForce.Value()) { return true; } // Hold a strong reference here so that the atom or nodeinfo doesn't go // away during UnsetAttr. If it did UnsetAttr would be left with a // dangling pointer as argument without knowing it. nsAttrName tmp(*name); aError = UnsetAttr(name->NamespaceID(), name->LocalName(), true); return false; } void Element::SetAttribute(const nsAString& aName, const nsAString& aValue, nsIPrincipal* aTriggeringPrincipal, ErrorResult& aError) { aError = nsContentUtils::CheckQName(aName, false); if (aError.Failed()) { return; } nsAutoString nameToUse; const nsAttrName* name = InternalGetAttrNameFromQName(aName, &nameToUse); if (!name) { RefPtr nameAtom = NS_AtomizeMainThread(nameToUse); if (!nameAtom) { aError.Throw(NS_ERROR_OUT_OF_MEMORY); return; } aError = SetAttr(kNameSpaceID_None, nameAtom, aValue, aTriggeringPrincipal, true); return; } aError = SetAttr(name->NamespaceID(), name->LocalName(), name->GetPrefix(), aValue, aTriggeringPrincipal, true); } void Element::RemoveAttribute(const nsAString& aName, ErrorResult& aError) { const nsAttrName* name = InternalGetAttrNameFromQName(aName); if (!name) { // If there is no canonical nsAttrName for this attribute name, then the // attribute does not exist and we can't get its namespace ID and // local name below, so we return early. return; } // Hold a strong reference here so that the atom or nodeinfo doesn't go // away during UnsetAttr. If it did UnsetAttr would be left with a // dangling pointer as argument without knowing it. nsAttrName tmp(*name); aError = UnsetAttr(name->NamespaceID(), name->LocalName(), true); } Attr* Element::GetAttributeNode(const nsAString& aName) { return Attributes()->GetNamedItem(aName); } already_AddRefed Element::SetAttributeNode(Attr& aNewAttr, ErrorResult& aError) { return Attributes()->SetNamedItemNS(aNewAttr, aError); } already_AddRefed Element::RemoveAttributeNode(Attr& aAttribute, ErrorResult& aError) { Element* elem = aAttribute.GetElement(); if (elem != this) { aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR); return nullptr; } nsAutoString nameSpaceURI; aAttribute.NodeInfo()->GetNamespaceURI(nameSpaceURI); return Attributes()->RemoveNamedItemNS( nameSpaceURI, aAttribute.NodeInfo()->LocalName(), aError); } void Element::GetAttributeNS(const nsAString& aNamespaceURI, const nsAString& aLocalName, nsAString& aReturn) { int32_t nsid = nsNameSpaceManager::GetInstance()->GetNameSpaceID( aNamespaceURI, nsContentUtils::IsChromeDoc(OwnerDoc())); if (nsid == kNameSpaceID_Unknown) { // Unknown namespace means no attribute. SetDOMStringToNull(aReturn); return; } RefPtr name = NS_AtomizeMainThread(aLocalName); bool hasAttr = GetAttr(nsid, name, aReturn); if (!hasAttr) { SetDOMStringToNull(aReturn); } } void Element::SetAttributeNS(const nsAString& aNamespaceURI, const nsAString& aQualifiedName, const nsAString& aValue, nsIPrincipal* aTriggeringPrincipal, ErrorResult& aError) { RefPtr ni; aError = nsContentUtils::GetNodeInfoFromQName( aNamespaceURI, aQualifiedName, mNodeInfo->NodeInfoManager(), ATTRIBUTE_NODE, getter_AddRefs(ni)); if (aError.Failed()) { return; } aError = SetAttr(ni->NamespaceID(), ni->NameAtom(), ni->GetPrefixAtom(), aValue, aTriggeringPrincipal, true); } already_AddRefed Element::CreateDevtoolsPrincipal() { // Return an ExpandedPrincipal that subsumes this Element's Principal, // and expands this Element's CSP to allow the actions that devtools // needs to perform. AutoTArray, 1> allowList = {NodePrincipal()}; RefPtr dtPrincipal = ExpandedPrincipal::Create( allowList, NodePrincipal()->OriginAttributesRef()); if (nsIContentSecurityPolicy* csp = GetCsp()) { RefPtr dtCsp = new nsCSPContext(); dtCsp->InitFromOther(static_cast(csp)); dtCsp->SetSkipAllowInlineStyleCheck(true); dtPrincipal->SetCsp(dtCsp); } return dtPrincipal.forget(); } void Element::SetAttributeDevtools(const nsAString& aName, const nsAString& aValue, ErrorResult& aError) { // Run this through SetAttribute with a devtools-ready principal. RefPtr dtPrincipal = CreateDevtoolsPrincipal(); SetAttribute(aName, aValue, dtPrincipal, aError); } void Element::SetAttributeDevtoolsNS(const nsAString& aNamespaceURI, const nsAString& aLocalName, const nsAString& aValue, ErrorResult& aError) { // Run this through SetAttributeNS with a devtools-ready principal. RefPtr dtPrincipal = CreateDevtoolsPrincipal(); SetAttributeNS(aNamespaceURI, aLocalName, aValue, dtPrincipal, aError); } void Element::RemoveAttributeNS(const nsAString& aNamespaceURI, const nsAString& aLocalName, ErrorResult& aError) { RefPtr name = NS_AtomizeMainThread(aLocalName); int32_t nsid = nsNameSpaceManager::GetInstance()->GetNameSpaceID( aNamespaceURI, nsContentUtils::IsChromeDoc(OwnerDoc())); if (nsid == kNameSpaceID_Unknown) { // If the namespace ID is unknown, it means there can't possibly be an // existing attribute. We would need a known namespace ID to pass into // UnsetAttr, so we return early if we don't have one. return; } aError = UnsetAttr(nsid, name, true); } Attr* Element::GetAttributeNodeNS(const nsAString& aNamespaceURI, const nsAString& aLocalName) { return GetAttributeNodeNSInternal(aNamespaceURI, aLocalName); } Attr* Element::GetAttributeNodeNSInternal(const nsAString& aNamespaceURI, const nsAString& aLocalName) { return Attributes()->GetNamedItemNS(aNamespaceURI, aLocalName); } already_AddRefed Element::SetAttributeNodeNS(Attr& aNewAttr, ErrorResult& aError) { return Attributes()->SetNamedItemNS(aNewAttr, aError); } already_AddRefed Element::GetElementsByTagNameNS( const nsAString& aNamespaceURI, const nsAString& aLocalName, ErrorResult& aError) { int32_t nameSpaceId = kNameSpaceID_Wildcard; if (!aNamespaceURI.EqualsLiteral("*")) { aError = nsNameSpaceManager::GetInstance()->RegisterNameSpace(aNamespaceURI, nameSpaceId); if (aError.Failed()) { return nullptr; } } NS_ASSERTION(nameSpaceId != kNameSpaceID_Unknown, "Unexpected namespace ID!"); return NS_GetContentList(this, nameSpaceId, aLocalName); } bool Element::HasAttributeNS(const nsAString& aNamespaceURI, const nsAString& aLocalName) const { int32_t nsid = nsNameSpaceManager::GetInstance()->GetNameSpaceID( aNamespaceURI, nsContentUtils::IsChromeDoc(OwnerDoc())); if (nsid == kNameSpaceID_Unknown) { // Unknown namespace means no attr... return false; } RefPtr name = NS_AtomizeMainThread(aLocalName); return HasAttr(nsid, name); } already_AddRefed Element::GetElementsByClassName( const nsAString& aClassNames) { return nsContentUtils::GetElementsByClassName(this, aClassNames); } Element* Element::GetAttrAssociatedElement(nsAtom* aAttr) const { const nsExtendedDOMSlots* slots = GetExistingExtendedDOMSlots(); if (slots) { nsWeakPtr weakAttrEl = slots->mExplicitlySetAttrElements.Get(aAttr); if (nsCOMPtr attrEl = do_QueryReferent(weakAttrEl)) { // If reflectedTarget's explicitly set attr-element |attrEl| is // a descendant of any of element's shadow-including ancestors, then // return |atrEl|. nsINode* root = SubtreeRoot(); nsINode* attrSubtreeRoot = attrEl->SubtreeRoot(); do { if (root == attrSubtreeRoot) { return attrEl; } auto* shadow = ShadowRoot::FromNode(root); if (!shadow || !shadow->GetHost()) { break; } root = shadow->GetHost()->SubtreeRoot(); } while (true); return nullptr; } } const nsAttrValue* value = GetParsedAttr(aAttr); if (!value) { return nullptr; } MOZ_ASSERT(value->Type() == nsAttrValue::eAtom, "Attribute used for attr associated element must be parsed"); nsAtom* valueAtom = value->GetAtomValue(); if (auto* docOrShadowRoot = GetContainingDocumentOrShadowRoot()) { return docOrShadowRoot->GetElementById(valueAtom); } nsINode* root = SubtreeRoot(); for (auto* node = root; node; node = node->GetNextNode(root)) { if (node->HasID() && node->AsContent()->GetID() == valueAtom) { return node->AsElement(); } } return nullptr; } void Element::ExplicitlySetAttrElement(nsAtom* aAttr, Element* aElement) { if (aElement) { nsExtendedDOMSlots* slots = ExtendedDOMSlots(); slots->mExplicitlySetAttrElements.InsertOrUpdate( aAttr, do_GetWeakReference(aElement)); SetAttr(aAttr, EmptyString(), IgnoreErrors()); return; } if (auto* slots = GetExistingExtendedDOMSlots()) { slots->mExplicitlySetAttrElements.Remove(aAttr); UnsetAttr(aAttr, IgnoreErrors()); } } void Element::GetElementsWithGrid(nsTArray>& aElements) { nsINode* cur = this; while (cur) { if (cur->IsElement()) { Element* elem = cur->AsElement(); if (elem->GetPrimaryFrame()) { // See if this has a GridContainerFrame. Use the same method that // nsGridContainerFrame uses, which deals with some edge cases. if (nsGridContainerFrame::GetGridContainerFrame( elem->GetPrimaryFrame())) { aElements.AppendElement(elem); } // This element has a frame, so allow the traversal to go through // the children. cur = cur->GetNextNode(this); continue; } } // Either this isn't an element, or it has no frame. Continue with the // traversal but ignore all the children. cur = cur->GetNextNonChildNode(this); } } bool Element::HasVisibleScrollbars() { nsIScrollableFrame* scrollFrame = GetScrollFrame(); return scrollFrame && (!scrollFrame->GetScrollbarVisibility().isEmpty()); } nsresult Element::BindToTree(BindContext& aContext, nsINode& aParent) { MOZ_ASSERT(aParent.IsContent() || aParent.IsDocument(), "Must have content or document parent!"); MOZ_ASSERT(aParent.OwnerDoc() == OwnerDoc(), "Must have the same owner document"); MOZ_ASSERT(OwnerDoc() == &aContext.OwnerDoc(), "These should match too"); MOZ_ASSERT(!IsInUncomposedDoc(), "Already have a document. Unbind first!"); MOZ_ASSERT(!IsInComposedDoc(), "Already have a document. Unbind first!"); // Note that as we recurse into the kids, they'll have a non-null parent. So // only assert if our parent is _changing_ while we have a parent. MOZ_ASSERT(!GetParentNode() || &aParent == GetParentNode(), "Already have a parent. Unbind first!"); const bool hadParent = !!GetParentNode(); if (aParent.IsInNativeAnonymousSubtree()) { SetFlags(NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE); } if (IsRootOfNativeAnonymousSubtree()) { aParent.SetMayHaveAnonymousChildren(); } else if (aParent.HasFlag(NODE_HAS_BEEN_IN_UA_WIDGET)) { SetFlags(NODE_HAS_BEEN_IN_UA_WIDGET); } if (aParent.HasFlag(ELEMENT_IS_DATALIST_OR_HAS_DATALIST_ANCESTOR)) { SetFlags(ELEMENT_IS_DATALIST_OR_HAS_DATALIST_ANCESTOR); } aParent.SetFlags(NODE_MAY_HAVE_ELEMENT_CHILDREN); // Now set the parent. mParent = &aParent; if (!hadParent && aParent.IsContent()) { SetParentIsContent(true); NS_ADDREF(mParent); } MOZ_ASSERT(!!GetParent() == aParent.IsContent()); MOZ_ASSERT(!HasAnyOfFlags(Element::kAllServoDescendantBits)); // Finally, set the document if (aParent.IsInUncomposedDoc() || aParent.IsInShadowTree()) { // We no longer need to track the subtree pointer (and in fact we'll assert // if we do this any later). ClearSubtreeRootPointer(); SetIsConnected(aParent.IsInComposedDoc()); if (aParent.IsInUncomposedDoc()) { SetIsInDocument(); } else { SetFlags(NODE_IS_IN_SHADOW_TREE); MOZ_ASSERT(aParent.IsContent() && aParent.AsContent()->GetContainingShadow()); ExtendedDOMSlots()->mContainingShadow = aParent.AsContent()->GetContainingShadow(); } // Clear the lazy frame construction bits. UnsetFlags(NODE_NEEDS_FRAME | NODE_DESCENDANTS_NEED_FRAMES); } else { // If we're not in the doc and not in a shadow tree, // update our subtree pointer. SetSubtreeRootPointer(aParent.SubtreeRoot()); } if (IsInComposedDoc()) { // Connected callback must be enqueued whenever a custom element becomes // connected. if (CustomElementData* data = GetCustomElementData()) { if (data->mState == CustomElementData::State::eCustom) { nsContentUtils::EnqueueLifecycleCallback( ElementCallbackType::eConnected, this, {}); } else { // Step 7.7.2.2 https://dom.spec.whatwg.org/#concept-node-insert nsContentUtils::TryToUpgradeElement(this); } } } // This has to be here, rather than in nsGenericHTMLElement::BindToTree, // because it has to happen after updating the parent pointer, but before // recursively binding the kids. if (IsHTMLElement()) { SetDirOnBind(this, nsIContent::FromNode(aParent)); } UpdateEditableState(false); // Call BindToTree on shadow root children. nsresult rv; if (ShadowRoot* shadowRoot = GetShadowRoot()) { rv = shadowRoot->Bind(); NS_ENSURE_SUCCESS(rv, rv); } // Now recurse into our kids. Ensure this happens after binding the shadow // root so that directionality of slots is updated. { for (nsIContent* child = GetFirstChild(); child; child = child->GetNextSibling()) { rv = child->BindToTree(aContext, *this); NS_ENSURE_SUCCESS(rv, rv); } } MutationObservers::NotifyParentChainChanged(this); // Ensure we only run this once, in the case we move the ShadowRoot around. if (aContext.SubtreeRootChanges()) { if (HasPartAttribute()) { if (ShadowRoot* shadow = GetContainingShadow()) { shadow->PartAdded(*this); } } if (HasID()) { AddToIdTable(DoGetID()); } HandleShadowDOMRelatedInsertionSteps(hadParent); } if (MayHaveStyle()) { // If MayHaveStyle() is true, we must be an nsStyledElement. static_cast(this)->ReparseStyleAttribute( /* aForceInDataDoc = */ false); } // XXXbz script execution during binding can trigger some of these // postcondition asserts.... But we do want that, since things will // generally be quite broken when that happens. MOZ_ASSERT(OwnerDoc() == aParent.OwnerDoc(), "Bound to wrong document"); MOZ_ASSERT(IsInComposedDoc() == aContext.InComposedDoc()); MOZ_ASSERT(IsInUncomposedDoc() == aContext.InUncomposedDoc()); MOZ_ASSERT(&aParent == GetParentNode(), "Bound to wrong parent node"); MOZ_ASSERT(aParent.IsInUncomposedDoc() == IsInUncomposedDoc()); MOZ_ASSERT(aParent.IsInComposedDoc() == IsInComposedDoc()); MOZ_ASSERT(aParent.IsInShadowTree() == IsInShadowTree()); MOZ_ASSERT(aParent.SubtreeRoot() == SubtreeRoot()); return NS_OK; } bool WillDetachFromShadowOnUnbind(const Element& aElement, bool aNullParent) { // If our parent still is in a shadow tree by now, and we're not removing // ourselves from it, then we're still going to be in a shadow tree after // this. return aElement.IsInShadowTree() && (aNullParent || !aElement.GetParent()->IsInShadowTree()); } void Element::UnbindFromTree(bool aNullParent) { HandleShadowDOMRelatedRemovalSteps(aNullParent); if (HasFlag(ELEMENT_IS_DATALIST_OR_HAS_DATALIST_ANCESTOR) && !IsHTMLElement(nsGkAtoms::datalist)) { if (aNullParent) { UnsetFlags(ELEMENT_IS_DATALIST_OR_HAS_DATALIST_ANCESTOR); } else { nsIContent* parent = GetParent(); MOZ_ASSERT(parent); if (!parent->HasFlag(ELEMENT_IS_DATALIST_OR_HAS_DATALIST_ANCESTOR)) { UnsetFlags(ELEMENT_IS_DATALIST_OR_HAS_DATALIST_ANCESTOR); } } } const bool detachingFromShadow = WillDetachFromShadowOnUnbind(*this, aNullParent); // Make sure to only remove from the ID table if our subtree root is actually // changing. if (IsInUncomposedDoc() || detachingFromShadow) { RemoveFromIdTable(); } if (detachingFromShadow && HasPartAttribute()) { if (ShadowRoot* shadow = GetContainingShadow()) { shadow->PartRemoved(*this); } } // Make sure to unbind this node before doing the kids Document* document = GetComposedDoc(); if (HasPointerLock()) { PointerLockManager::Unlock(); } if (mState.HasState(ElementState::FULLSCREEN)) { // The element being removed is an ancestor of the fullscreen element, // exit fullscreen state. nsContentUtils::ReportToConsole(nsIScriptError::warningFlag, "DOM"_ns, OwnerDoc(), nsContentUtils::eDOM_PROPERTIES, "RemovedFullscreenElement"); // Fully exit fullscreen. Document::ExitFullscreenInDocTree(OwnerDoc()); } MOZ_ASSERT_IF(HasServoData(), document); MOZ_ASSERT_IF(HasServoData(), IsInNativeAnonymousSubtree()); if (document) { ClearServoData(document); } // Ensure that CSS transitions don't continue on an element at a // different place in the tree (even if reinserted before next // animation refresh). // // We need to delete the properties while we're still in document // (if we were in document) so that they can look up the // PendingAnimationTracker on the document and remove their animations, // and so they can find their pres context for dispatching cancel events. // // FIXME(bug 522599): Need a test for this. // FIXME(emilio): Why not clearing the effect set as well? if (auto* data = GetAnimationData()) { data->ClearAllAnimationCollections(); } if (aNullParent) { if (GetParent()) { RefPtr p; p.swap(mParent); } else { mParent = nullptr; } SetParentIsContent(false); } #ifdef DEBUG // If we can get access to the PresContext, then we sanity-check that // we're not leaving behind a pointer to ourselves as the PresContext's // cached provider of the viewport's scrollbar styles. if (document) { nsPresContext* presContext = document->GetPresContext(); if (presContext) { MOZ_ASSERT(this != presContext->GetViewportScrollStylesOverrideElement(), "Leaving behind a raw pointer to this element (as having " "propagated scrollbar styles) - that's dangerous..."); } } # ifdef ACCESSIBILITY MOZ_ASSERT(!GetAccService() || !GetAccService()->HasAccessible(this), "An accessible for this element still exists!"); # endif #endif ClearInDocument(); SetIsConnected(false); if (HasElementCreatedFromPrototypeAndHasUnmodifiedL10n()) { if (document) { document->mL10nProtoElements.Remove(this); } ClearElementCreatedFromPrototypeAndHasUnmodifiedL10n(); } if (aNullParent || !mParent->IsInShadowTree()) { UnsetFlags(NODE_IS_IN_SHADOW_TREE); // Begin keeping track of our subtree root. SetSubtreeRootPointer(aNullParent ? this : mParent->SubtreeRoot()); } if (nsExtendedDOMSlots* slots = GetExistingExtendedDOMSlots()) { if (aNullParent || !mParent->IsInShadowTree()) { slots->mContainingShadow = nullptr; } } if (document) { // Disconnected must be enqueued whenever a connected custom element becomes // disconnected. CustomElementData* data = GetCustomElementData(); if (data) { if (data->mState == CustomElementData::State::eCustom) { nsContentUtils::EnqueueLifecycleCallback( ElementCallbackType::eDisconnected, this, {}); } else { // Remove an unresolved custom element that is a candidate for upgrade // when a custom element is disconnected. nsContentUtils::UnregisterUnresolvedElement(this); } } if (HasLastRememberedBSize() || HasLastRememberedISize()) { // Need to remove the last remembered size at the next ResizeObserver // opportunity, so observe the element. But if already observed, we still // want the callback to be invoked even if the size was already 0x0, so // unobserve it first. document->UnobserveForLastRememberedSize(*this); document->ObserveForLastRememberedSize(*this); } } // This has to be here, rather than in nsGenericHTMLElement::UnbindFromTree, // because it has to happen after unsetting the parent pointer, but before // recursively unbinding the kids. if (IsHTMLElement()) { ResetDir(this); } for (nsIContent* child = GetFirstChild(); child; child = child->GetNextSibling()) { // Note that we pass false for aNullParent here, since we don't want // the kids to forget us. child->UnbindFromTree(false); } MutationObservers::NotifyParentChainChanged(this); // Unbind children of shadow root. if (ShadowRoot* shadowRoot = GetShadowRoot()) { shadowRoot->Unbind(); } MOZ_ASSERT(!HasAnyOfFlags(kAllServoDescendantBits)); MOZ_ASSERT(!document || document->GetServoRestyleRoot() != this); } UniquePtr Element::GetAnimatedAttr(int32_t aNamespaceID, nsAtom* aName) { return nullptr; } nsDOMCSSAttributeDeclaration* Element::SMILOverrideStyle() { Element::nsExtendedDOMSlots* slots = ExtendedDOMSlots(); if (!slots->mSMILOverrideStyle) { slots->mSMILOverrideStyle = new nsDOMCSSAttributeDeclaration(this, true); } return slots->mSMILOverrideStyle; } DeclarationBlock* Element::GetSMILOverrideStyleDeclaration() { Element::nsExtendedDOMSlots* slots = GetExistingExtendedDOMSlots(); return slots ? slots->mSMILOverrideStyleDeclaration.get() : nullptr; } void Element::SetSMILOverrideStyleDeclaration(DeclarationBlock& aDeclaration) { ExtendedDOMSlots()->mSMILOverrideStyleDeclaration = &aDeclaration; // Only need to request a restyle if we're in a document. (We might not // be in a document, if we're clearing animation effects on a target node // that's been detached since the previous animation sample.) if (Document* doc = GetComposedDoc()) { if (PresShell* presShell = doc->GetPresShell()) { presShell->RestyleForAnimation(this, RestyleHint::RESTYLE_SMIL); } } } bool Element::IsLabelable() const { return false; } bool Element::IsInteractiveHTMLContent() const { return false; } DeclarationBlock* Element::GetInlineStyleDeclaration() const { if (!MayHaveStyle()) { return nullptr; } const nsAttrValue* attrVal = mAttrs.GetAttr(nsGkAtoms::style); if (attrVal && attrVal->Type() == nsAttrValue::eCSSDeclaration) { return attrVal->GetCSSDeclarationValue(); } return nullptr; } const nsMappedAttributes* Element::GetMappedAttributes() const { return mAttrs.GetMapped(); } void Element::InlineStyleDeclarationWillChange(MutationClosureData& aData) { MOZ_ASSERT_UNREACHABLE("Element::InlineStyleDeclarationWillChange"); } nsresult Element::SetInlineStyleDeclaration(DeclarationBlock& aDeclaration, MutationClosureData& aData) { MOZ_ASSERT_UNREACHABLE("Element::SetInlineStyleDeclaration"); return NS_ERROR_NOT_IMPLEMENTED; } NS_IMETHODIMP_(bool) Element::IsAttributeMapped(const nsAtom* aAttribute) const { return false; } nsChangeHint Element::GetAttributeChangeHint(const nsAtom* aAttribute, int32_t aModType) const { return nsChangeHint(0); } bool Element::FindAttributeDependence(const nsAtom* aAttribute, const MappedAttributeEntry* const aMaps[], uint32_t aMapCount) { for (uint32_t mapindex = 0; mapindex < aMapCount; ++mapindex) { for (const MappedAttributeEntry* map = aMaps[mapindex]; map->attribute; ++map) { if (aAttribute == map->attribute) { return true; } } } return false; } already_AddRefed Element::GetExistingAttrNameFromQName( const nsAString& aStr) const { const nsAttrName* name = InternalGetAttrNameFromQName(aStr); if (!name) { return nullptr; } RefPtr nodeInfo; if (name->IsAtom()) { nodeInfo = mNodeInfo->NodeInfoManager()->GetNodeInfo( name->Atom(), nullptr, kNameSpaceID_None, ATTRIBUTE_NODE); } else { nodeInfo = name->NodeInfo(); } return nodeInfo.forget(); } // static bool Element::ShouldBlur(nsIContent* aContent) { // Determine if the current element is focused, if it is not focused // then we should not try to blur Document* document = aContent->GetComposedDoc(); if (!document) return false; nsCOMPtr window = document->GetWindow(); if (!window) return false; nsCOMPtr focusedFrame; nsIContent* contentToBlur = nsFocusManager::GetFocusedDescendant( window, nsFocusManager::eOnlyCurrentWindow, getter_AddRefs(focusedFrame)); if (!contentToBlur) { return false; } if (contentToBlur == aContent) { return true; } ShadowRoot* root = aContent->GetShadowRoot(); if (root && root->DelegatesFocus() && contentToBlur->IsShadowIncludingInclusiveDescendantOf(root)) { return true; } return false; } /* static */ nsresult Element::DispatchEvent(nsPresContext* aPresContext, WidgetEvent* aEvent, nsIContent* aTarget, bool aFullDispatch, nsEventStatus* aStatus) { MOZ_ASSERT(aTarget, "Must have target"); MOZ_ASSERT(aEvent, "Must have source event"); MOZ_ASSERT(aStatus, "Null out param?"); if (!aPresContext) { return NS_OK; } RefPtr presShell = aPresContext->GetPresShell(); if (!presShell) { return NS_OK; } if (aFullDispatch) { return presShell->HandleEventWithTarget(aEvent, nullptr, aTarget, aStatus); } return presShell->HandleDOMEventWithTarget(aTarget, aEvent, aStatus); } /* static */ nsresult Element::DispatchClickEvent(nsPresContext* aPresContext, WidgetInputEvent* aSourceEvent, nsIContent* aTarget, bool aFullDispatch, const EventFlags* aExtraEventFlags, nsEventStatus* aStatus) { MOZ_ASSERT(aTarget, "Must have target"); MOZ_ASSERT(aSourceEvent, "Must have source event"); MOZ_ASSERT(aStatus, "Null out param?"); WidgetMouseEvent event(aSourceEvent->IsTrusted(), eMouseClick, aSourceEvent->mWidget, WidgetMouseEvent::eReal); event.mRefPoint = aSourceEvent->mRefPoint; uint32_t clickCount = 1; float pressure = 0; uint32_t pointerId = 0; // Use the default value here. uint16_t inputSource = 0; WidgetMouseEvent* sourceMouseEvent = aSourceEvent->AsMouseEvent(); if (sourceMouseEvent) { clickCount = sourceMouseEvent->mClickCount; pressure = sourceMouseEvent->mPressure; pointerId = sourceMouseEvent->pointerId; inputSource = sourceMouseEvent->mInputSource; } else if (aSourceEvent->mClass == eKeyboardEventClass) { event.mFlags.mIsPositionless = true; inputSource = MouseEvent_Binding::MOZ_SOURCE_KEYBOARD; } event.mPressure = pressure; event.mClickCount = clickCount; event.pointerId = pointerId; event.mInputSource = inputSource; event.mModifiers = aSourceEvent->mModifiers; if (aExtraEventFlags) { // Be careful not to overwrite existing flags! event.mFlags.Union(*aExtraEventFlags); } return DispatchEvent(aPresContext, &event, aTarget, aFullDispatch, aStatus); } //---------------------------------------------------------------------- nsresult Element::LeaveLink(nsPresContext* aPresContext) { if (!aPresContext || !aPresContext->Document()->LinkHandlingEnabled()) { return NS_OK; } nsIDocShell* shell = aPresContext->Document()->GetDocShell(); if (!shell) { return NS_OK; } return nsDocShell::Cast(shell)->OnLeaveLink(); } void Element::SetEventHandler(nsAtom* aEventName, const nsAString& aValue, bool aDefer) { Document* ownerDoc = OwnerDoc(); if (ownerDoc->IsLoadedAsData()) { // Make this a no-op rather than throwing an error to avoid // the error causing problems setting the attribute. return; } MOZ_ASSERT(aEventName, "Must have event name!"); bool defer = true; EventListenerManager* manager = GetEventListenerManagerForAttr(aEventName, &defer); if (!manager) { return; } defer = defer && aDefer; // only defer if everyone agrees... manager->SetEventHandler(aEventName, aValue, defer, !nsContentUtils::IsChromeDoc(ownerDoc), this); } //---------------------------------------------------------------------- const nsAttrName* Element::InternalGetAttrNameFromQName( const nsAString& aStr, nsAutoString* aNameToUse) const { MOZ_ASSERT(!aNameToUse || aNameToUse->IsEmpty()); const nsAttrName* val = nullptr; if (IsHTMLElement() && IsInHTMLDocument()) { nsAutoString lower; nsAutoString& outStr = aNameToUse ? *aNameToUse : lower; nsContentUtils::ASCIIToLower(aStr, outStr); val = mAttrs.GetExistingAttrNameFromQName(outStr); if (val) { outStr.Truncate(); } } else { val = mAttrs.GetExistingAttrNameFromQName(aStr); if (!val && aNameToUse) { *aNameToUse = aStr; } } return val; } bool Element::MaybeCheckSameAttrVal(int32_t aNamespaceID, const nsAtom* aName, const nsAtom* aPrefix, const nsAttrValueOrString& aValue, bool aNotify, nsAttrValue& aOldValue, uint8_t* aModType, bool* aHasListeners, bool* aOldValueSet) { bool modification = false; *aHasListeners = aNotify && nsContentUtils::HasMutationListeners( this, NS_EVENT_BITS_MUTATION_ATTRMODIFIED, this); *aOldValueSet = false; // If we have no listeners and aNotify is false, we are almost certainly // coming from the content sink and will almost certainly have no previous // value. Even if we do, setting the value is cheap when we have no // listeners and don't plan to notify. The check for aNotify here is an // optimization, the check for *aHasListeners is a correctness issue. if (*aHasListeners || aNotify) { BorrowedAttrInfo info(GetAttrInfo(aNamespaceID, aName)); if (info.mValue) { // Check whether the old value is the same as the new one. Note that we // only need to actually _get_ the old value if we have listeners or // if the element is a custom element (because it may have an // attribute changed callback). if (*aHasListeners || GetCustomElementData()) { // Need to store the old value. // // If the current attribute value contains a pointer to some other data // structure that gets updated in the process of setting the attribute // we'll no longer have the old value of the attribute. Therefore, we // should serialize the attribute value now to keep a snapshot. // // We have to serialize the value anyway in order to create the // mutation event so there's no cost in doing it now. aOldValue.SetToSerialized(*info.mValue); *aOldValueSet = true; } bool valueMatches = aValue.EqualsAsStrings(*info.mValue); if (valueMatches && aPrefix == info.mName->GetPrefix()) { return true; } modification = true; } } *aModType = modification ? static_cast(MutationEvent_Binding::MODIFICATION) : static_cast(MutationEvent_Binding::ADDITION); return false; } bool Element::OnlyNotifySameValueSet(int32_t aNamespaceID, nsAtom* aName, nsAtom* aPrefix, const nsAttrValueOrString& aValue, bool aNotify, nsAttrValue& aOldValue, uint8_t* aModType, bool* aHasListeners, bool* aOldValueSet) { if (!MaybeCheckSameAttrVal(aNamespaceID, aName, aPrefix, aValue, aNotify, aOldValue, aModType, aHasListeners, aOldValueSet)) { return false; } nsAutoScriptBlocker scriptBlocker; MutationObservers::NotifyAttributeSetToCurrentValue(this, aNamespaceID, aName); return true; } nsresult Element::SetSingleClassFromParser(nsAtom* aSingleClassName) { // Keep this in sync with SetAttr and SetParsedAttr below. nsAttrValue value(aSingleClassName); Document* document = GetComposedDoc(); mozAutoDocUpdate updateBatch(document, false); // In principle, BeforeSetAttr should be called here if a node type // existed that wanted to do something special for class, but there // is no such node type, so calling SetMayHaveClass() directly. SetMayHaveClass(); return SetAttrAndNotify(kNameSpaceID_None, nsGkAtoms::_class, nullptr, // prefix nullptr, // old value value, nullptr, static_cast(MutationEvent_Binding::ADDITION), false, // hasListeners false, // notify kCallAfterSetAttr, document, updateBatch); } nsresult Element::SetAttr(int32_t aNamespaceID, nsAtom* aName, nsAtom* aPrefix, const nsAString& aValue, nsIPrincipal* aSubjectPrincipal, bool aNotify) { // Keep this in sync with SetParsedAttr below and SetSingleClassFromParser // above. NS_ENSURE_ARG_POINTER(aName); NS_ASSERTION(aNamespaceID != kNameSpaceID_Unknown, "Don't call SetAttr with unknown namespace"); uint8_t modType; bool hasListeners; nsAttrValue oldValue; bool oldValueSet; { const nsAttrValueOrString value(aValue); if (OnlyNotifySameValueSet(aNamespaceID, aName, aPrefix, value, aNotify, oldValue, &modType, &hasListeners, &oldValueSet)) { OnAttrSetButNotChanged(aNamespaceID, aName, value, aNotify); return NS_OK; } } // Hold a script blocker while calling ParseAttribute since that can call // out to id-observers Document* document = GetComposedDoc(); mozAutoDocUpdate updateBatch(document, aNotify); if (aNotify) { MutationObservers::NotifyAttributeWillChange(this, aNamespaceID, aName, modType); } nsAttrValue attrValue; if (!ParseAttribute(aNamespaceID, aName, aValue, aSubjectPrincipal, attrValue)) { attrValue.SetTo(aValue); } BeforeSetAttr(aNamespaceID, aName, &attrValue, aNotify); PreIdMaybeChange(aNamespaceID, aName, &attrValue); return SetAttrAndNotify(aNamespaceID, aName, aPrefix, oldValueSet ? &oldValue : nullptr, attrValue, aSubjectPrincipal, modType, hasListeners, aNotify, kCallAfterSetAttr, document, updateBatch); } nsresult Element::SetParsedAttr(int32_t aNamespaceID, nsAtom* aName, nsAtom* aPrefix, nsAttrValue& aParsedValue, bool aNotify) { // Keep this in sync with SetAttr and SetSingleClassFromParser above NS_ENSURE_ARG_POINTER(aName); NS_ASSERTION(aNamespaceID != kNameSpaceID_Unknown, "Don't call SetAttr with unknown namespace"); uint8_t modType; bool hasListeners; nsAttrValue oldValue; bool oldValueSet; { const nsAttrValueOrString value(aParsedValue); if (OnlyNotifySameValueSet(aNamespaceID, aName, aPrefix, value, aNotify, oldValue, &modType, &hasListeners, &oldValueSet)) { OnAttrSetButNotChanged(aNamespaceID, aName, value, aNotify); return NS_OK; } } Document* document = GetComposedDoc(); mozAutoDocUpdate updateBatch(document, aNotify); if (aNotify) { MutationObservers::NotifyAttributeWillChange(this, aNamespaceID, aName, modType); } BeforeSetAttr(aNamespaceID, aName, &aParsedValue, aNotify); PreIdMaybeChange(aNamespaceID, aName, &aParsedValue); return SetAttrAndNotify(aNamespaceID, aName, aPrefix, oldValueSet ? &oldValue : nullptr, aParsedValue, nullptr, modType, hasListeners, aNotify, kCallAfterSetAttr, document, updateBatch); } nsresult Element::SetAttrAndNotify( int32_t aNamespaceID, nsAtom* aName, nsAtom* aPrefix, const nsAttrValue* aOldValue, nsAttrValue& aParsedValue, nsIPrincipal* aSubjectPrincipal, uint8_t aModType, bool aFireMutation, bool aNotify, bool aCallAfterSetAttr, Document* aComposedDocument, const mozAutoDocUpdate& aGuard) { nsresult rv; nsMutationGuard::DidMutate(); // Copy aParsedValue for later use since it will be lost when we call // SetAndSwapMappedAttr below nsAttrValue valueForAfterSetAttr; if (aCallAfterSetAttr || GetCustomElementData()) { valueForAfterSetAttr.SetTo(aParsedValue); } bool hadValidDir = false; bool hadDirAuto = false; bool oldValueSet; if (aNamespaceID == kNameSpaceID_None) { if (aName == nsGkAtoms::dir) { hadValidDir = HasValidDir() || IsHTMLElement(nsGkAtoms::bdi); hadDirAuto = HasDirAuto(); // already takes bdi into account } // XXXbz Perhaps we should push up the attribute mapping function // stuff to Element? if (!IsAttributeMapped(aName) || !SetAndSwapMappedAttribute(aName, aParsedValue, &oldValueSet, &rv)) { rv = mAttrs.SetAndSwapAttr(aName, aParsedValue, &oldValueSet); } } else { RefPtr ni; ni = mNodeInfo->NodeInfoManager()->GetNodeInfo(aName, aPrefix, aNamespaceID, ATTRIBUTE_NODE); rv = mAttrs.SetAndSwapAttr(ni, aParsedValue, &oldValueSet); } NS_ENSURE_SUCCESS(rv, rv); PostIdMaybeChange(aNamespaceID, aName, &valueForAfterSetAttr); // If the old value owns its own data, we know it is OK to keep using it. // oldValue will be null if there was no previously set value const nsAttrValue* oldValue; if (aParsedValue.StoresOwnData()) { if (oldValueSet) { oldValue = &aParsedValue; } else { oldValue = nullptr; } } else { // No need to conditionally assign null here. If there was no previously // set value for the attribute, aOldValue will already be null. oldValue = aOldValue; } if (HasElementCreatedFromPrototypeAndHasUnmodifiedL10n() && aNamespaceID == kNameSpaceID_None && (aName == nsGkAtoms::datal10nid || aName == nsGkAtoms::datal10nargs)) { ClearElementCreatedFromPrototypeAndHasUnmodifiedL10n(); if (aComposedDocument) { aComposedDocument->mL10nProtoElements.Remove(this); } } const CustomElementData* data = GetCustomElementData(); if (data && data->mState == CustomElementData::State::eCustom) { CustomElementDefinition* definition = data->GetCustomElementDefinition(); MOZ_ASSERT(definition, "Should have a valid CustomElementDefinition"); if (definition->IsInObservedAttributeList(aName)) { RefPtr oldValueAtom; if (oldValue) { oldValueAtom = oldValue->GetAsAtom(); } else { // If there is no old value, get the value of the uninitialized // attribute that was swapped with aParsedValue. oldValueAtom = aParsedValue.GetAsAtom(); } RefPtr newValueAtom = valueForAfterSetAttr.GetAsAtom(); nsAutoString ns; nsNameSpaceManager::GetInstance()->GetNameSpaceURI(aNamespaceID, ns); LifecycleCallbackArgs args; args.mName = nsDependentAtomString(aName); args.mOldValue = (aModType == MutationEvent_Binding::ADDITION ? VoidString() : nsDependentAtomString(oldValueAtom)); args.mNewValue = nsDependentAtomString(newValueAtom); args.mNamespaceURI = (ns.IsEmpty() ? VoidString() : ns); nsContentUtils::EnqueueLifecycleCallback( ElementCallbackType::eAttributeChanged, this, args, definition); } } if (aCallAfterSetAttr) { AfterSetAttr(aNamespaceID, aName, &valueForAfterSetAttr, oldValue, aSubjectPrincipal, aNotify); if (aNamespaceID == kNameSpaceID_None && aName == nsGkAtoms::dir) { OnSetDirAttr(this, &valueForAfterSetAttr, hadValidDir, hadDirAuto, aNotify); } } UpdateState(aNotify); if (aNotify) { // Don't pass aOldValue to AttributeChanged since it may not be reliable. // Callers only compute aOldValue under certain conditions which may not // be triggered by all nsIMutationObservers. MutationObservers::NotifyAttributeChanged( this, aNamespaceID, aName, aModType, aParsedValue.StoresOwnData() ? &aParsedValue : nullptr); } if (aFireMutation) { InternalMutationEvent mutation(true, eLegacyAttrModified); nsAutoString ns; nsNameSpaceManager::GetInstance()->GetNameSpaceURI(aNamespaceID, ns); Attr* attrNode = GetAttributeNodeNSInternal(ns, nsDependentAtomString(aName)); mutation.mRelatedNode = attrNode; mutation.mAttrName = aName; nsAutoString newValue; GetAttr(aNamespaceID, aName, newValue); if (!newValue.IsEmpty()) { mutation.mNewAttrValue = NS_Atomize(newValue); } if (oldValue && !oldValue->IsEmptyString()) { mutation.mPrevAttrValue = oldValue->GetAsAtom(); } mutation.mAttrChange = aModType; mozAutoSubtreeModified subtree(OwnerDoc(), this); AsyncEventDispatcher::RunDOMEventWhenSafe(*this, mutation); } return NS_OK; } bool Element::ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute, const nsAString& aValue, nsIPrincipal* aMaybeScriptedPrincipal, nsAttrValue& aResult) { if (aAttribute == nsGkAtoms::lang) { aResult.ParseAtom(aValue); return true; } if (aNamespaceID == kNameSpaceID_None) { if (aAttribute == nsGkAtoms::_class || aAttribute == nsGkAtoms::part) { aResult.ParseAtomArray(aValue); return true; } if (aAttribute == nsGkAtoms::exportparts) { aResult.ParsePartMapping(aValue); return true; } if (aAttribute == nsGkAtoms::id) { // Store id as an atom. id="" means that the element has no id, // not that it has an emptystring as the id. if (aValue.IsEmpty()) { return false; } aResult.ParseAtom(aValue); return true; } } return false; } bool Element::SetAndSwapMappedAttribute(nsAtom* aName, nsAttrValue& aValue, bool* aValueWasSet, nsresult* aRetval) { *aRetval = NS_OK; return false; } void Element::BeforeSetAttr(int32_t aNamespaceID, nsAtom* aName, const nsAttrValue* aValue, bool aNotify) { if (aNamespaceID == kNameSpaceID_None) { if (aName == nsGkAtoms::_class && aValue) { // Note: This flag is asymmetrical. It is never unset and isn't exact. // If it is ever made to be exact, we probably need to handle this // similarly to how ids are handled in PreIdMaybeChange and // PostIdMaybeChange. // Note that SetSingleClassFromParser inlines BeforeSetAttr and // calls SetMayHaveClass directly. Making a subclass take action // on the class attribute in a BeforeSetAttr override would // require revising SetSingleClassFromParser. SetMayHaveClass(); } } } void Element::AfterSetAttr(int32_t aNamespaceID, nsAtom* aName, const nsAttrValue* aValue, const nsAttrValue* aOldValue, nsIPrincipal* aMaybeScriptedPrincipal, bool aNotify) { if (aNamespaceID == kNameSpaceID_None) { if (aName == nsGkAtoms::part) { bool isPart = !!aValue; if (HasPartAttribute() != isPart) { SetHasPartAttribute(isPart); if (ShadowRoot* shadow = GetContainingShadow()) { if (isPart) { shadow->PartAdded(*this); } else { shadow->PartRemoved(*this); } } } MOZ_ASSERT(HasPartAttribute() == isPart); } else if (aName == nsGkAtoms::slot && GetParent()) { if (ShadowRoot* shadow = GetParent()->GetShadowRoot()) { shadow->MaybeReassignContent(*this); } } } } void Element::PreIdMaybeChange(int32_t aNamespaceID, nsAtom* aName, const nsAttrValue* aValue) { if (aNamespaceID != kNameSpaceID_None || aName != nsGkAtoms::id) { return; } RemoveFromIdTable(); } void Element::PostIdMaybeChange(int32_t aNamespaceID, nsAtom* aName, const nsAttrValue* aValue) { if (aNamespaceID != kNameSpaceID_None || aName != nsGkAtoms::id) { return; } // id="" means that the element has no id, not that it has an empty // string as the id. if (aValue && !aValue->IsEmptyString()) { SetHasID(); AddToIdTable(aValue->GetAtomValue()); } else { ClearHasID(); } } void Element::OnAttrSetButNotChanged(int32_t aNamespaceID, nsAtom* aName, const nsAttrValueOrString& aValue, bool aNotify) { const CustomElementData* data = GetCustomElementData(); if (data && data->mState == CustomElementData::State::eCustom) { CustomElementDefinition* definition = data->GetCustomElementDefinition(); MOZ_ASSERT(definition, "Should have a valid CustomElementDefinition"); if (definition->IsInObservedAttributeList(aName)) { nsAutoString ns; nsNameSpaceManager::GetInstance()->GetNameSpaceURI(aNamespaceID, ns); nsAutoString value(aValue.String()); LifecycleCallbackArgs args; args.mName = nsDependentAtomString(aName); args.mOldValue = value; args.mNewValue = value; args.mNamespaceURI = (ns.IsEmpty() ? VoidString() : ns); nsContentUtils::EnqueueLifecycleCallback( ElementCallbackType::eAttributeChanged, this, args, definition); } } } EventListenerManager* Element::GetEventListenerManagerForAttr(nsAtom* aAttrName, bool* aDefer) { *aDefer = true; return GetOrCreateListenerManager(); } bool Element::GetAttr(int32_t aNameSpaceID, const nsAtom* aName, nsAString& aResult) const { DOMString str; bool haveAttr = GetAttr(aNameSpaceID, aName, str); str.ToString(aResult); return haveAttr; } int32_t Element::FindAttrValueIn(int32_t aNameSpaceID, const nsAtom* aName, AttrArray::AttrValuesArray* aValues, nsCaseTreatment aCaseSensitive) const { return mAttrs.FindAttrValueIn(aNameSpaceID, aName, aValues, aCaseSensitive); } nsresult Element::UnsetAttr(int32_t aNameSpaceID, nsAtom* aName, bool aNotify) { NS_ASSERTION(nullptr != aName, "must have attribute name"); int32_t index = mAttrs.IndexOfAttr(aName, aNameSpaceID); if (index < 0) { return NS_OK; } Document* document = GetComposedDoc(); mozAutoDocUpdate updateBatch(document, aNotify); if (aNotify) { MutationObservers::NotifyAttributeWillChange( this, aNameSpaceID, aName, MutationEvent_Binding::REMOVAL); } BeforeSetAttr(aNameSpaceID, aName, nullptr, aNotify); bool hasMutationListeners = aNotify && nsContentUtils::HasMutationListeners( this, NS_EVENT_BITS_MUTATION_ATTRMODIFIED, this); PreIdMaybeChange(aNameSpaceID, aName, nullptr); // Grab the attr node if needed before we remove it from the attr map RefPtr attrNode; if (hasMutationListeners) { nsAutoString ns; nsNameSpaceManager::GetInstance()->GetNameSpaceURI(aNameSpaceID, ns); attrNode = GetAttributeNodeNSInternal(ns, nsDependentAtomString(aName)); } // Clear the attribute out from attribute map. nsDOMSlots* slots = GetExistingDOMSlots(); if (slots && slots->mAttributeMap) { slots->mAttributeMap->DropAttribute(aNameSpaceID, aName); } // The id-handling code, and in the future possibly other code, need to // react to unexpected attribute changes. nsMutationGuard::DidMutate(); bool hadValidDir = false; bool hadDirAuto = false; if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::dir) { hadValidDir = HasValidDir() || IsHTMLElement(nsGkAtoms::bdi); hadDirAuto = HasDirAuto(); // already takes bdi into account } nsAttrValue oldValue; nsresult rv = mAttrs.RemoveAttrAt(index, oldValue); NS_ENSURE_SUCCESS(rv, rv); PostIdMaybeChange(aNameSpaceID, aName, nullptr); const CustomElementData* data = GetCustomElementData(); if (data && data->mState == CustomElementData::State::eCustom) { CustomElementDefinition* definition = data->GetCustomElementDefinition(); MOZ_ASSERT(definition, "Should have a valid CustomElementDefinition"); if (definition->IsInObservedAttributeList(aName)) { nsAutoString ns; nsNameSpaceManager::GetInstance()->GetNameSpaceURI(aNameSpaceID, ns); RefPtr oldValueAtom = oldValue.GetAsAtom(); LifecycleCallbackArgs args; args.mName = nsDependentAtomString(aName); args.mOldValue = nsDependentAtomString(oldValueAtom); args.mNewValue = VoidString(); args.mNamespaceURI = (ns.IsEmpty() ? VoidString() : ns); nsContentUtils::EnqueueLifecycleCallback( ElementCallbackType::eAttributeChanged, this, args, definition); } } AfterSetAttr(aNameSpaceID, aName, nullptr, &oldValue, nullptr, aNotify); UpdateState(aNotify); if (aNotify) { // We can always pass oldValue here since there is no new value which could // have corrupted it. MutationObservers::NotifyAttributeChanged( this, aNameSpaceID, aName, MutationEvent_Binding::REMOVAL, &oldValue); } if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::dir) { OnSetDirAttr(this, nullptr, hadValidDir, hadDirAuto, aNotify); } if (hasMutationListeners) { InternalMutationEvent mutation(true, eLegacyAttrModified); mutation.mRelatedNode = attrNode; mutation.mAttrName = aName; nsAutoString value; oldValue.ToString(value); if (!value.IsEmpty()) mutation.mPrevAttrValue = NS_Atomize(value); mutation.mAttrChange = MutationEvent_Binding::REMOVAL; mozAutoSubtreeModified subtree(OwnerDoc(), this); AsyncEventDispatcher::RunDOMEventWhenSafe(*this, mutation); } return NS_OK; } void Element::DescribeAttribute(uint32_t index, nsAString& aOutDescription) const { // name mAttrs.AttrNameAt(index)->GetQualifiedName(aOutDescription); // value aOutDescription.AppendLiteral("=\""); nsAutoString value; mAttrs.AttrAt(index)->ToString(value); for (uint32_t i = value.Length(); i > 0; --i) { if (value[i - 1] == char16_t('"')) value.Insert(char16_t('\\'), i - 1); } aOutDescription.Append(value); aOutDescription.Append('"'); } #ifdef MOZ_DOM_LIST void Element::ListAttributes(FILE* out) const { uint32_t index, count = mAttrs.AttrCount(); for (index = 0; index < count; index++) { nsAutoString attributeDescription; DescribeAttribute(index, attributeDescription); fputs(" ", out); fputs(NS_LossyConvertUTF16toASCII(attributeDescription).get(), out); } } void Element::List(FILE* out, int32_t aIndent, const nsCString& aPrefix) const { int32_t indent; for (indent = aIndent; --indent >= 0;) fputs(" ", out); fputs(aPrefix.get(), out); fputs(NS_LossyConvertUTF16toASCII(mNodeInfo->QualifiedName()).get(), out); fprintf(out, "@%p", (void*)this); ListAttributes(out); fprintf(out, " state=[%llx]", static_cast(State().GetInternalValue())); fprintf(out, " flags=[%08x]", static_cast(GetFlags())); if (IsClosestCommonInclusiveAncestorForRangeInSelection()) { const LinkedList* ranges = GetExistingClosestCommonInclusiveAncestorRanges(); int32_t count = 0; if (ranges) { // Can't use range-based iteration on a const LinkedList, unfortunately. for (const AbstractRange* r = ranges->getFirst(); r; r = r->getNext()) { ++count; } } fprintf(out, " ranges:%d", count); } fprintf(out, " primaryframe=%p", static_cast(GetPrimaryFrame())); fprintf(out, " refcount=%" PRIuPTR "<", mRefCnt.get()); nsIContent* child = GetFirstChild(); if (child) { fputs("\n", out); for (; child; child = child->GetNextSibling()) { child->List(out, aIndent + 1); } for (indent = aIndent; --indent >= 0;) fputs(" ", out); } fputs(">\n", out); } void Element::DumpContent(FILE* out, int32_t aIndent, bool aDumpAll) const { int32_t indent; for (indent = aIndent; --indent >= 0;) fputs(" ", out); const nsString& buf = mNodeInfo->QualifiedName(); fputs("<", out); fputs(NS_LossyConvertUTF16toASCII(buf).get(), out); if (aDumpAll) ListAttributes(out); fputs(">", out); if (aIndent) fputs("\n", out); for (nsIContent* child = GetFirstChild(); child; child = child->GetNextSibling()) { int32_t indent = aIndent ? aIndent + 1 : 0; child->DumpContent(out, indent, aDumpAll); } for (indent = aIndent; --indent >= 0;) fputs(" ", out); fputs("", out); if (aIndent) fputs("\n", out); } #endif void Element::Describe(nsAString& aOutDescription, bool aShort) const { aOutDescription.Append(mNodeInfo->QualifiedName()); aOutDescription.AppendPrintf("@%p", (void*)this); uint32_t index, count = mAttrs.AttrCount(); for (index = 0; index < count; index++) { if (aShort) { const nsAttrName* name = mAttrs.AttrNameAt(index); if (!name->Equals(nsGkAtoms::id) && !name->Equals(nsGkAtoms::_class)) { continue; } } aOutDescription.Append(' '); nsAutoString attributeDescription; DescribeAttribute(index, attributeDescription); aOutDescription.Append(attributeDescription); } } bool Element::CheckHandleEventForLinksPrecondition( EventChainVisitor& aVisitor) const { // Make sure we actually are a link if (!IsLink()) { return false; } if (aVisitor.mEventStatus == nsEventStatus_eConsumeNoDefault || (!aVisitor.mEvent->IsTrusted() && (aVisitor.mEvent->mMessage != eMouseClick) && (aVisitor.mEvent->mMessage != eKeyPress) && (aVisitor.mEvent->mMessage != eLegacyDOMActivate)) || aVisitor.mEvent->mFlags.mMultipleActionsPrevented) { return false; } return true; } void Element::GetEventTargetParentForLinks(EventChainPreVisitor& aVisitor) { // Optimisation: return early if this event doesn't interest us. // IMPORTANT: this switch and the switch below it must be kept in sync! switch (aVisitor.mEvent->mMessage) { case eMouseOver: case eFocus: case eMouseOut: case eBlur: break; default: return; } // Make sure we meet the preconditions before continuing if (!CheckHandleEventForLinksPrecondition(aVisitor)) { return; } // We try to handle everything we can even when the URI is invalid. Though of // course we can't do stuff like updating the status bar, so return early here // instead. nsCOMPtr absURI = GetHrefURI(); if (!absURI) { return; } // We do the status bar updates in GetEventTargetParent so that the status bar // gets updated even if the event is consumed before we have a chance to set // it. switch (aVisitor.mEvent->mMessage) { // Set the status bar similarly for mouseover and focus case eMouseOver: aVisitor.mEventStatus = nsEventStatus_eConsumeNoDefault; [[fallthrough]]; case eFocus: { InternalFocusEvent* focusEvent = aVisitor.mEvent->AsFocusEvent(); if (!focusEvent || !focusEvent->mIsRefocus) { nsAutoString target; GetLinkTarget(target); nsContentUtils::TriggerLink(this, absURI, target, /* click */ false, /* isTrusted */ true); // Make sure any ancestor links don't also TriggerLink aVisitor.mEvent->mFlags.mMultipleActionsPrevented = true; } break; } case eMouseOut: aVisitor.mEventStatus = nsEventStatus_eConsumeNoDefault; [[fallthrough]]; case eBlur: { nsresult rv = LeaveLink(aVisitor.mPresContext); if (NS_SUCCEEDED(rv)) { aVisitor.mEvent->mFlags.mMultipleActionsPrevented = true; } break; } default: // switch not in sync with the optimization switch earlier in this // function MOZ_ASSERT_UNREACHABLE("switch statements not in sync"); } } // This dispatches a 'chromelinkclick' CustomEvent to chrome-only listeners, // so that frontend can handle middle-clicks and ctrl/cmd/shift/etc.-clicks // on links, without getting a call for every single click the user makes. // Only supported for click or auxclick events. void Element::DispatchChromeOnlyLinkClickEvent( EventChainPostVisitor& aVisitor) { MOZ_ASSERT(aVisitor.mEvent->mMessage == eMouseAuxClick || aVisitor.mEvent->mMessage == eMouseClick, "DispatchChromeOnlyLinkClickEvent supports only click and " "auxclick source events"); Document* doc = OwnerDoc(); RefPtr event = new XULCommandEvent(doc, aVisitor.mPresContext, nullptr); RefPtr mouseDOMEvent = aVisitor.mDOMEvent; if (!mouseDOMEvent) { mouseDOMEvent = EventDispatcher::CreateEvent( aVisitor.mEvent->mOriginalTarget, aVisitor.mPresContext, aVisitor.mEvent, u""_ns); NS_ADDREF(aVisitor.mDOMEvent = mouseDOMEvent); } MouseEvent* mouseEvent = mouseDOMEvent->AsMouseEvent(); event->InitCommandEvent( u"chromelinkclick"_ns, /* CanBubble */ true, /* Cancelable */ true, nsGlobalWindowInner::Cast(doc->GetInnerWindow()), 0, mouseEvent->CtrlKey(), mouseEvent->AltKey(), mouseEvent->ShiftKey(), mouseEvent->MetaKey(), mouseEvent->Button(), mouseDOMEvent, mouseEvent->MozInputSource(), IgnoreErrors()); // Note: we're always trusted, but the event we pass as the `sourceEvent` // might not be. Frontend code will check that event's trusted property to // make that determination; doing it this way means we don't also start // acting on web-generated custom 'chromelinkclick' events which would // provide additional attack surface for a malicious actor. event->SetTrusted(true); event->WidgetEventPtr()->mFlags.mOnlyChromeDispatch = true; DispatchEvent(*event); } nsresult Element::PostHandleEventForLinks(EventChainPostVisitor& aVisitor) { // Optimisation: return early if this event doesn't interest us. // IMPORTANT: this switch and the switch below it must be kept in sync! switch (aVisitor.mEvent->mMessage) { case eMouseDown: case eMouseClick: case eMouseAuxClick: case eLegacyDOMActivate: case eKeyPress: break; default: return NS_OK; } // Make sure we meet the preconditions before continuing if (!CheckHandleEventForLinksPrecondition(aVisitor)) { return NS_OK; } // We try to handle ~everything consistently even if the href is invalid // (GetHrefURI() returns null). nsresult rv = NS_OK; switch (aVisitor.mEvent->mMessage) { case eMouseDown: { if (!OwnerDoc()->LinkHandlingEnabled()) { break; } WidgetMouseEvent* const mouseEvent = aVisitor.mEvent->AsMouseEvent(); mouseEvent->mFlags.mMultipleActionsPrevented |= mouseEvent->mButton == MouseButton::ePrimary || mouseEvent->mButton == MouseButton::eMiddle; if (mouseEvent->mButton == MouseButton::ePrimary) { // For avoiding focus popup opened by clicking this link to get blurred, // we need this to get focused now. However, if the mousedown occurs // in editable element in this link, we should not do this because its // editing host will get focus. if (IsInComposedDoc()) { Element* targetElement = Element::FromEventTargetOrNull( aVisitor.mEvent->GetDOMEventTarget()); if (targetElement && targetElement->IsInclusiveDescendantOf(this) && (!targetElement->IsEditable() || targetElement->GetEditingHost() == this)) { if (RefPtr fm = nsFocusManager::GetFocusManager()) { RefPtr kungFuDeathGrip(this); fm->SetFocus(kungFuDeathGrip, nsIFocusManager::FLAG_BYMOUSE | nsIFocusManager::FLAG_NOSCROLL); } } } if (aVisitor.mPresContext) { EventStateManager::SetActiveManager( aVisitor.mPresContext->EventStateManager(), this); } // OK, we're pretty sure we're going to load, so warm up a speculative // connection to be sure we have one ready when we open the channel. if (nsIDocShell* shell = OwnerDoc()->GetDocShell()) { if (nsCOMPtr absURI = GetHrefURI()) { if (nsCOMPtr sc = mozilla::components::IO::Service()) { nsCOMPtr ir = do_QueryInterface(shell); sc->SpeculativeConnect(absURI, NodePrincipal(), ir, false); } } } } } break; case eMouseClick: { WidgetMouseEvent* mouseEvent = aVisitor.mEvent->AsMouseEvent(); if (mouseEvent->IsLeftClickEvent()) { if (!mouseEvent->IsControl() && !mouseEvent->IsMeta() && !mouseEvent->IsAlt() && !mouseEvent->IsShift()) { // The default action is simply to dispatch DOMActivate nsEventStatus status = nsEventStatus_eIgnore; // DOMActivate event should be trusted since the activation is // actually occurred even if the cause is an untrusted click event. InternalUIEvent actEvent(true, eLegacyDOMActivate, mouseEvent); actEvent.mDetail = 1; rv = EventDispatcher::Dispatch(this, aVisitor.mPresContext, &actEvent, nullptr, &status); if (NS_SUCCEEDED(rv)) { aVisitor.mEventStatus = nsEventStatus_eConsumeNoDefault; } } DispatchChromeOnlyLinkClickEvent(aVisitor); } break; } case eMouseAuxClick: { DispatchChromeOnlyLinkClickEvent(aVisitor); break; } case eLegacyDOMActivate: { if (aVisitor.mEvent->mOriginalTarget == this) { if (nsCOMPtr absURI = GetHrefURI()) { nsAutoString target; GetLinkTarget(target); const InternalUIEvent* activeEvent = aVisitor.mEvent->AsUIEvent(); MOZ_ASSERT(activeEvent); nsContentUtils::TriggerLink(this, absURI, target, /* click */ true, activeEvent->IsTrustable()); aVisitor.mEventStatus = nsEventStatus_eConsumeNoDefault; } } } break; case eKeyPress: { WidgetKeyboardEvent* keyEvent = aVisitor.mEvent->AsKeyboardEvent(); if (keyEvent && keyEvent->mKeyCode == NS_VK_RETURN) { nsEventStatus status = nsEventStatus_eIgnore; rv = DispatchClickEvent(aVisitor.mPresContext, keyEvent, this, false, nullptr, &status); if (NS_SUCCEEDED(rv)) { aVisitor.mEventStatus = nsEventStatus_eConsumeNoDefault; } } } break; default: // switch not in sync with the optimization switch earlier in this // function MOZ_ASSERT_UNREACHABLE("switch statements not in sync"); return NS_ERROR_UNEXPECTED; } return rv; } void Element::GetLinkTarget(nsAString& aTarget) { aTarget.Truncate(); } static nsStaticAtom* const sPropertiesToTraverseAndUnlink[] = { nsGkAtoms::dirAutoSetBy, nullptr}; // static nsStaticAtom* const* Element::HTMLSVGPropertiesToTraverseAndUnlink() { return sPropertiesToTraverseAndUnlink; } nsresult Element::CopyInnerTo(Element* aDst, ReparseAttributes aReparse) { nsresult rv = aDst->mAttrs.EnsureCapacityToClone(mAttrs); NS_ENSURE_SUCCESS(rv, rv); const bool reparse = aReparse == ReparseAttributes::Yes; uint32_t count = mAttrs.AttrCount(); for (uint32_t i = 0; i < count; ++i) { BorrowedAttrInfo info = mAttrs.AttrInfoAt(i); const nsAttrName* name = info.mName; const nsAttrValue* value = info.mValue; if (value->Type() == nsAttrValue::eCSSDeclaration) { MOZ_ASSERT(name->Equals(nsGkAtoms::style, kNameSpaceID_None)); // We still clone CSS attributes, even in the `reparse` (cross-document) // case. https://github.com/w3c/webappsec-csp/issues/212 nsAttrValue valueCopy(*value); rv = aDst->SetParsedAttr(name->NamespaceID(), name->LocalName(), name->GetPrefix(), valueCopy, false); NS_ENSURE_SUCCESS(rv, rv); value->GetCSSDeclarationValue()->SetImmutable(); } else if (reparse) { nsAutoString valStr; value->ToString(valStr); rv = aDst->SetAttr(name->NamespaceID(), name->LocalName(), name->GetPrefix(), valStr, false); NS_ENSURE_SUCCESS(rv, rv); } else { nsAttrValue valueCopy(*value); rv = aDst->SetParsedAttr(name->NamespaceID(), name->LocalName(), name->GetPrefix(), valueCopy, false); NS_ENSURE_SUCCESS(rv, rv); } } dom::NodeInfo* dstNodeInfo = aDst->NodeInfo(); if (CustomElementData* data = GetCustomElementData()) { // The cloned node may be a custom element that may require // enqueing upgrade reaction. if (nsAtom* typeAtom = data->GetCustomElementType()) { aDst->SetCustomElementData(MakeUnique(typeAtom)); MOZ_ASSERT(dstNodeInfo->NameAtom()->Equals(dstNodeInfo->LocalName())); CustomElementDefinition* definition = nsContentUtils::LookupCustomElementDefinition( dstNodeInfo->GetDocument(), dstNodeInfo->NameAtom(), dstNodeInfo->NamespaceID(), typeAtom); if (definition) { nsContentUtils::EnqueueUpgradeReaction(aDst, definition); } } } if (dstNodeInfo->GetDocument()->IsStaticDocument()) { // Propagate :defined state to the static clone. if (State().HasState(ElementState::DEFINED)) { aDst->SetDefined(true); } } return NS_OK; } Element* Element::Closest(const nsACString& aSelector, ErrorResult& aResult) { AUTO_PROFILER_LABEL_DYNAMIC_NSCSTRING("Element::Closest", LAYOUT_SelectorQuery, aSelector); const StyleSelectorList* list = ParseSelectorList(aSelector, aResult); if (!list) { return nullptr; } return const_cast(Servo_SelectorList_Closest(this, list)); } bool Element::Matches(const nsACString& aSelector, ErrorResult& aResult) { AUTO_PROFILER_LABEL_DYNAMIC_NSCSTRING("Element::Matches", LAYOUT_SelectorQuery, aSelector); const StyleSelectorList* list = ParseSelectorList(aSelector, aResult); if (!list) { return false; } return Servo_SelectorList_Matches(this, list); } static const nsAttrValue::EnumTable kCORSAttributeTable[] = { // Order matters here // See ParseCORSValue {"anonymous", CORS_ANONYMOUS}, {"use-credentials", CORS_USE_CREDENTIALS}, {nullptr, 0}}; /* static */ void Element::ParseCORSValue(const nsAString& aValue, nsAttrValue& aResult) { DebugOnly success = aResult.ParseEnumValue(aValue, kCORSAttributeTable, false, // default value is anonymous if aValue is // not a value we understand &kCORSAttributeTable[0]); MOZ_ASSERT(success); } /* static */ CORSMode Element::StringToCORSMode(const nsAString& aValue) { if (aValue.IsVoid()) { return CORS_NONE; } nsAttrValue val; Element::ParseCORSValue(aValue, val); return CORSMode(val.GetEnumValue()); } /* static */ CORSMode Element::AttrValueToCORSMode(const nsAttrValue* aValue) { if (!aValue) { return CORS_NONE; } return CORSMode(aValue->GetEnumValue()); } /** * Returns nullptr if requests for fullscreen are allowed in the current * context. Requests are only allowed if the user initiated them (like with * a mouse-click or key press), unless this check has been disabled by * setting the pref "full-screen-api.allow-trusted-requests-only" to false * or if the caller is privileged. Feature policy may also deny requests. * If fullscreen is not allowed, a key for the error message is returned. */ static const char* GetFullscreenError(CallerType aCallerType, Document* aDocument) { MOZ_ASSERT(aDocument); // Privileged callers can always request fullscreen if (aCallerType == CallerType::System) { return nullptr; } if (nsContentUtils::IsPDFJS(aDocument->GetPrincipal())) { // The built-in pdf viewer can always request fullscreen return nullptr; } if (const char* error = aDocument->GetFullscreenError(aCallerType)) { return error; } // Bypass user interaction checks if preference is set if (!StaticPrefs::full_screen_api_allow_trusted_requests_only()) { return nullptr; } if (!aDocument->ConsumeTransientUserGestureActivation()) { return "FullscreenDeniedNotInputDriven"; } // Entering full-screen on mouse mouse event is only allowed with left mouse // button if (StaticPrefs::full_screen_api_mouse_event_allow_left_button_only() && (EventStateManager::sCurrentMouseBtn == MouseButton::eMiddle || EventStateManager::sCurrentMouseBtn == MouseButton::eSecondary)) { return "FullscreenDeniedMouseEventOnlyLeftBtn"; } return nullptr; } void Element::SetCapture(bool aRetargetToElement) { // If there is already an active capture, ignore this request. This would // occur if a splitter, frame resizer, etc had already captured and we don't // want to override those. if (!PresShell::GetCapturingContent()) { PresShell::SetCapturingContent( this, CaptureFlags::PreventDragStart | (aRetargetToElement ? CaptureFlags::RetargetToElement : CaptureFlags::None)); } } void Element::SetCaptureAlways(bool aRetargetToElement) { PresShell::SetCapturingContent( this, CaptureFlags::PreventDragStart | CaptureFlags::IgnoreAllowedState | (aRetargetToElement ? CaptureFlags::RetargetToElement : CaptureFlags::None)); } void Element::ReleaseCapture() { if (PresShell::GetCapturingContent() == this) { PresShell::ReleaseCapturingContent(); } } already_AddRefed Element::RequestFullscreen(CallerType aCallerType, ErrorResult& aRv) { auto request = FullscreenRequest::Create(this, aCallerType, aRv); RefPtr promise = request->GetPromise(); // Only grant fullscreen requests if this is called from inside a trusted // event handler (i.e. inside an event handler for a user initiated event). // This stops the fullscreen from being abused similar to the popups of old, // and it also makes it harder for bad guys' script to go fullscreen and // spoof the browser chrome/window and phish logins etc. // Note that requests for fullscreen inside a web app's origin are exempt // from this restriction. if (const char* error = GetFullscreenError(aCallerType, OwnerDoc())) { request->Reject(error); } else { OwnerDoc()->RequestFullscreen(std::move(request)); } return promise.forget(); } void Element::RequestPointerLock(CallerType aCallerType) { PointerLockManager::RequestLock(this, aCallerType); } already_AddRefed Element::GetAsFlexContainer() { // We need the flex frame to compute additional info, and use // that annotated version of the frame. nsFlexContainerFrame* flexFrame = nsFlexContainerFrame::GetFlexFrameWithComputedInfo( GetPrimaryFrame(FlushType::Layout)); if (flexFrame) { RefPtr flex = new Flex(this, flexFrame); return flex.forget(); } return nullptr; } void Element::GetGridFragments(nsTArray>& aResult) { nsGridContainerFrame* frame = nsGridContainerFrame::GetGridFrameWithComputedInfo( GetPrimaryFrame(FlushType::Layout)); // If we get a nsGridContainerFrame from the prior call, // all the next-in-flow frames will also be nsGridContainerFrames. while (frame) { // Get the existing Grid object, if it exists. This object is // guaranteed to be up-to-date because GetGridFrameWithComputedInfo // will delete an existing one when regenerating grid info. Grid* gridFragment = frame->GetGridFragmentInfo(); if (!gridFragment) { // Grid constructor will add itself as a property to frame, and // its unlink method will remove itself if the frame still exists. gridFragment = new Grid(this, frame); } aResult.AppendElement(gridFragment); frame = static_cast(frame->GetNextInFlow()); } } bool Element::HasGridFragments() { return !!nsGridContainerFrame::GetGridFrameWithComputedInfo( GetPrimaryFrame(FlushType::Layout)); } already_AddRefed Element::GetTransformToAncestor( Element& aAncestor) { nsIFrame* primaryFrame = GetPrimaryFrame(); nsIFrame* ancestorFrame = aAncestor.GetPrimaryFrame(); Matrix4x4 transform; if (primaryFrame) { // If aAncestor is not actually an ancestor of this (including nullptr), // then the call to GetTransformToAncestor will return the transform // all the way up through the parent chain. transform = nsLayoutUtils::GetTransformToAncestor(RelativeTo{primaryFrame}, RelativeTo{ancestorFrame}, nsIFrame::IN_CSS_UNITS) .GetMatrix(); } DOMMatrixReadOnly* matrix = new DOMMatrix(this, transform); RefPtr result(matrix); return result.forget(); } already_AddRefed Element::GetTransformToParent() { nsIFrame* primaryFrame = GetPrimaryFrame(); Matrix4x4 transform; if (primaryFrame) { nsIFrame* parentFrame = primaryFrame->GetParent(); transform = nsLayoutUtils::GetTransformToAncestor(RelativeTo{primaryFrame}, RelativeTo{parentFrame}, nsIFrame::IN_CSS_UNITS) .GetMatrix(); } DOMMatrixReadOnly* matrix = new DOMMatrix(this, transform); RefPtr result(matrix); return result.forget(); } already_AddRefed Element::GetTransformToViewport() { nsIFrame* primaryFrame = GetPrimaryFrame(); Matrix4x4 transform; if (primaryFrame) { transform = nsLayoutUtils::GetTransformToAncestor( RelativeTo{primaryFrame}, RelativeTo{nsLayoutUtils::GetDisplayRootFrame(primaryFrame)}, nsIFrame::IN_CSS_UNITS) .GetMatrix(); } DOMMatrixReadOnly* matrix = new DOMMatrix(this, transform); RefPtr result(matrix); return result.forget(); } already_AddRefed Element::Animate( JSContext* aContext, JS::Handle aKeyframes, const UnrestrictedDoubleOrKeyframeAnimationOptions& aOptions, ErrorResult& aError) { nsCOMPtr ownerGlobal = GetOwnerGlobal(); if (!ownerGlobal) { aError.Throw(NS_ERROR_FAILURE); return nullptr; } GlobalObject global(aContext, ownerGlobal->GetGlobalJSObject()); MOZ_ASSERT(!global.Failed()); // KeyframeEffect constructor doesn't follow the standard Xray calling // convention and needs to be called in caller's compartment. // This should match to RunConstructorInCallerCompartment attribute in // KeyframeEffect.webidl. RefPtr effect = KeyframeEffect::Constructor(global, this, aKeyframes, aOptions, aError); if (aError.Failed()) { return nullptr; } // Animation constructor follows the standard Xray calling convention and // needs to be called in the target element's realm. JSAutoRealm ar(aContext, global.Get()); AnimationTimeline* timeline = OwnerDoc()->Timeline(); RefPtr animation = Animation::Constructor( global, effect, Optional(timeline), aError); if (aError.Failed()) { return nullptr; } if (aOptions.IsKeyframeAnimationOptions()) { animation->SetId(aOptions.GetAsKeyframeAnimationOptions().mId); } animation->Play(aError, Animation::LimitBehavior::AutoRewind); if (aError.Failed()) { return nullptr; } return animation.forget(); } void Element::GetAnimations(const GetAnimationsOptions& aOptions, nsTArray>& aAnimations) { if (Document* doc = GetComposedDoc()) { // We don't need to explicitly flush throttled animations here, since // updating the animation style of elements will never affect the set of // running animations and it's only the set of running animations that is // important here. // // NOTE: Any changes to the flags passed to the following call should // be reflected in the flags passed in DocumentOrShadowRoot::GetAnimations // too. doc->FlushPendingNotifications( ChangesToFlush(FlushType::Style, false /* flush animations */)); } GetAnimationsWithoutFlush(aOptions, aAnimations); } void Element::GetAnimationsWithoutFlush( const GetAnimationsOptions& aOptions, nsTArray>& aAnimations) { Element* elem = this; PseudoStyleType pseudoType = PseudoStyleType::NotPseudo; // For animations on generated-content elements, the animations are stored // on the parent element. if (IsGeneratedContentContainerForBefore()) { elem = GetParentElement(); pseudoType = PseudoStyleType::before; } else if (IsGeneratedContentContainerForAfter()) { elem = GetParentElement(); pseudoType = PseudoStyleType::after; } else if (IsGeneratedContentContainerForMarker()) { elem = GetParentElement(); pseudoType = PseudoStyleType::marker; } if (!elem) { return; } if (!aOptions.mSubtree || AnimationUtils::IsSupportedPseudoForAnimations(pseudoType)) { GetAnimationsUnsorted(elem, pseudoType, aAnimations); } else { for (nsIContent* node = this; node; node = node->GetNextNode(this)) { if (!node->IsElement()) { continue; } Element* element = node->AsElement(); Element::GetAnimationsUnsorted(element, PseudoStyleType::NotPseudo, aAnimations); Element::GetAnimationsUnsorted(element, PseudoStyleType::before, aAnimations); Element::GetAnimationsUnsorted(element, PseudoStyleType::after, aAnimations); Element::GetAnimationsUnsorted(element, PseudoStyleType::marker, aAnimations); } } aAnimations.Sort(AnimationPtrComparator>()); } /* static */ void Element::GetAnimationsUnsorted(Element* aElement, PseudoStyleType aPseudoType, nsTArray>& aAnimations) { MOZ_ASSERT(aPseudoType == PseudoStyleType::NotPseudo || AnimationUtils::IsSupportedPseudoForAnimations(aPseudoType), "Unsupported pseudo type"); MOZ_ASSERT(aElement, "Null element"); EffectSet* effects = EffectSet::Get(aElement, aPseudoType); if (!effects) { return; } for (KeyframeEffect* effect : *effects) { MOZ_ASSERT(effect && effect->GetAnimation(), "Only effects associated with an animation should be " "added to an element's effect set"); Animation* animation = effect->GetAnimation(); MOZ_ASSERT(animation->IsRelevant(), "Only relevant animations should be added to an element's " "effect set"); aAnimations.AppendElement(animation); } } void Element::CloneAnimationsFrom(const Element& aOther) { AnimationTimeline* const timeline = OwnerDoc()->Timeline(); MOZ_ASSERT(timeline, "Timeline has not been set on the document yet"); // Iterate through all pseudo types and copy the effects from each of the // other element's effect sets into this element's effect set. for (PseudoStyleType pseudoType : {PseudoStyleType::NotPseudo, PseudoStyleType::before, PseudoStyleType::after, PseudoStyleType::marker}) { // If the element has an effect set for this pseudo type (or not pseudo) // then copy the effects and animation properties. if (auto* const effects = EffectSet::Get(&aOther, pseudoType)) { auto* const clonedEffects = EffectSet::GetOrCreate(this, pseudoType); for (KeyframeEffect* const effect : *effects) { auto* animation = effect->GetAnimation(); if (animation->AsCSSTransition()) { // Don't clone transitions, for compat with other browsers. continue; } // Clone the effect. RefPtr clonedEffect = new KeyframeEffect( OwnerDoc(), OwningAnimationTarget{this, pseudoType}, *effect); // Clone the animation RefPtr clonedAnimation = Animation::ClonePausedAnimation( OwnerDoc()->GetParentObject(), *animation, *clonedEffect, *timeline); if (!clonedAnimation) { continue; } clonedEffects->AddEffect(*clonedEffect); } } } } void Element::GetInnerHTML(nsAString& aInnerHTML, OOMReporter& aError) { GetMarkup(false, aInnerHTML); } void Element::SetInnerHTML(const nsAString& aInnerHTML, nsIPrincipal* aSubjectPrincipal, ErrorResult& aError) { SetInnerHTMLInternal(aInnerHTML, aError); } void Element::GetOuterHTML(nsAString& aOuterHTML) { GetMarkup(true, aOuterHTML); } void Element::SetOuterHTML(const nsAString& aOuterHTML, ErrorResult& aError) { nsCOMPtr parent = GetParentNode(); if (!parent) { return; } if (parent->NodeType() == DOCUMENT_NODE) { aError.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR); return; } if (OwnerDoc()->IsHTMLDocument()) { nsAtom* localName; int32_t namespaceID; if (parent->IsElement()) { localName = parent->NodeInfo()->NameAtom(); namespaceID = parent->NodeInfo()->NamespaceID(); } else { NS_ASSERTION( parent->NodeType() == DOCUMENT_FRAGMENT_NODE, "How come the parent isn't a document, a fragment or an element?"); localName = nsGkAtoms::body; namespaceID = kNameSpaceID_XHTML; } RefPtr fragment = new (OwnerDoc()->NodeInfoManager()) DocumentFragment(OwnerDoc()->NodeInfoManager()); nsContentUtils::ParseFragmentHTML( aOuterHTML, fragment, localName, namespaceID, OwnerDoc()->GetCompatibilityMode() == eCompatibility_NavQuirks, true); parent->ReplaceChild(*fragment, *this, aError); return; } nsCOMPtr context; if (parent->IsElement()) { context = parent; } else { NS_ASSERTION( parent->NodeType() == DOCUMENT_FRAGMENT_NODE, "How come the parent isn't a document, a fragment or an element?"); RefPtr info = OwnerDoc()->NodeInfoManager()->GetNodeInfo( nsGkAtoms::body, nullptr, kNameSpaceID_XHTML, ELEMENT_NODE); context = NS_NewHTMLBodyElement(info.forget(), FROM_PARSER_FRAGMENT); } RefPtr fragment = nsContentUtils::CreateContextualFragment( context, aOuterHTML, true, aError); if (aError.Failed()) { return; } parent->ReplaceChild(*fragment, *this, aError); } enum nsAdjacentPosition { eBeforeBegin, eAfterBegin, eBeforeEnd, eAfterEnd }; void Element::InsertAdjacentHTML(const nsAString& aPosition, const nsAString& aText, ErrorResult& aError) { nsAdjacentPosition position; if (aPosition.LowerCaseEqualsLiteral("beforebegin")) { position = eBeforeBegin; } else if (aPosition.LowerCaseEqualsLiteral("afterbegin")) { position = eAfterBegin; } else if (aPosition.LowerCaseEqualsLiteral("beforeend")) { position = eBeforeEnd; } else if (aPosition.LowerCaseEqualsLiteral("afterend")) { position = eAfterEnd; } else { aError.Throw(NS_ERROR_DOM_SYNTAX_ERR); return; } nsCOMPtr destination; if (position == eBeforeBegin || position == eAfterEnd) { destination = GetParent(); if (!destination) { aError.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR); return; } } else { destination = this; } // mozAutoDocUpdate keeps the owner document alive. Therefore, using a raw // pointer here is safe. Document* const doc = OwnerDoc(); // Needed when insertAdjacentHTML is used in combination with contenteditable mozAutoDocUpdate updateBatch(doc, true); nsAutoScriptLoaderDisabler sld(doc); // Batch possible DOMSubtreeModified events. mozAutoSubtreeModified subtree(doc, nullptr); // Parse directly into destination if possible if (doc->IsHTMLDocument() && !OwnerDoc()->MayHaveDOMMutationObservers() && (position == eBeforeEnd || (position == eAfterEnd && !GetNextSibling()) || (position == eAfterBegin && !GetFirstChild()))) { int32_t oldChildCount = destination->GetChildCount(); int32_t contextNs = destination->GetNameSpaceID(); nsAtom* contextLocal = destination->NodeInfo()->NameAtom(); if (contextLocal == nsGkAtoms::html && contextNs == kNameSpaceID_XHTML) { // For compat with IE6 through IE9. Willful violation of HTML5 as of // 2011-04-06. CreateContextualFragment does the same already. // Spec bug: http://www.w3.org/Bugs/Public/show_bug.cgi?id=12434 contextLocal = nsGkAtoms::body; } aError = nsContentUtils::ParseFragmentHTML( aText, destination, contextLocal, contextNs, doc->GetCompatibilityMode() == eCompatibility_NavQuirks, true); // HTML5 parser has notified, but not fired mutation events. nsContentUtils::FireMutationEventsForDirectParsing(doc, destination, oldChildCount); return; } // couldn't parse directly RefPtr fragment = nsContentUtils::CreateContextualFragment( destination, aText, true, aError); if (aError.Failed()) { return; } // Suppress assertion about node removal mutation events that can't have // listeners anyway, because no one has had the chance to register mutation // listeners on the fragment that comes from the parser. nsAutoScriptBlockerSuppressNodeRemoved scriptBlocker; switch (position) { case eBeforeBegin: destination->InsertBefore(*fragment, this, aError); break; case eAfterBegin: static_cast(this)->InsertBefore(*fragment, GetFirstChild(), aError); break; case eBeforeEnd: static_cast(this)->AppendChild(*fragment, aError); break; case eAfterEnd: destination->InsertBefore(*fragment, GetNextSibling(), aError); break; } } nsINode* Element::InsertAdjacent(const nsAString& aWhere, nsINode* aNode, ErrorResult& aError) { if (aWhere.LowerCaseEqualsLiteral("beforebegin")) { nsCOMPtr parent = GetParentNode(); if (!parent) { return nullptr; } parent->InsertBefore(*aNode, this, aError); } else if (aWhere.LowerCaseEqualsLiteral("afterbegin")) { nsCOMPtr refNode = GetFirstChild(); static_cast(this)->InsertBefore(*aNode, refNode, aError); } else if (aWhere.LowerCaseEqualsLiteral("beforeend")) { static_cast(this)->AppendChild(*aNode, aError); } else if (aWhere.LowerCaseEqualsLiteral("afterend")) { nsCOMPtr parent = GetParentNode(); if (!parent) { return nullptr; } nsCOMPtr refNode = GetNextSibling(); parent->InsertBefore(*aNode, refNode, aError); } else { aError.Throw(NS_ERROR_DOM_SYNTAX_ERR); return nullptr; } return aError.Failed() ? nullptr : aNode; } Element* Element::InsertAdjacentElement(const nsAString& aWhere, Element& aElement, ErrorResult& aError) { nsINode* newNode = InsertAdjacent(aWhere, &aElement, aError); MOZ_ASSERT(!newNode || newNode->IsElement()); return newNode ? newNode->AsElement() : nullptr; } void Element::InsertAdjacentText(const nsAString& aWhere, const nsAString& aData, ErrorResult& aError) { RefPtr textNode = OwnerDoc()->CreateTextNode(aData); InsertAdjacent(aWhere, textNode, aError); } TextEditor* Element::GetTextEditorInternal() { TextControlElement* textControlElement = TextControlElement::FromNode(this); return textControlElement ? MOZ_KnownLive(textControlElement)->GetTextEditor() : nullptr; } nsresult Element::SetBoolAttr(nsAtom* aAttr, bool aValue) { if (aValue) { return SetAttr(kNameSpaceID_None, aAttr, u""_ns, true); } return UnsetAttr(kNameSpaceID_None, aAttr, true); } void Element::GetEnumAttr(nsAtom* aAttr, const char* aDefault, nsAString& aResult) const { GetEnumAttr(aAttr, aDefault, aDefault, aResult); } void Element::GetEnumAttr(nsAtom* aAttr, const char* aDefaultMissing, const char* aDefaultInvalid, nsAString& aResult) const { const nsAttrValue* attrVal = mAttrs.GetAttr(aAttr); aResult.Truncate(); if (!attrVal) { if (aDefaultMissing) { AppendASCIItoUTF16(nsDependentCString(aDefaultMissing), aResult); } else { SetDOMStringToNull(aResult); } } else { if (attrVal->Type() == nsAttrValue::eEnum) { attrVal->GetEnumString(aResult, true); } else if (aDefaultInvalid) { AppendASCIItoUTF16(nsDependentCString(aDefaultInvalid), aResult); } } } void Element::SetOrRemoveNullableStringAttr(nsAtom* aName, const nsAString& aValue, ErrorResult& aError) { if (DOMStringIsNull(aValue)) { UnsetAttr(aName, aError); } else { SetAttr(aName, aValue, aError); } } Directionality Element::GetComputedDirectionality() const { if (nsIFrame* frame = GetPrimaryFrame()) { return frame->StyleVisibility()->mDirection == StyleDirection::Ltr ? eDir_LTR : eDir_RTL; } return GetDirectionality(); } float Element::FontSizeInflation() { nsIFrame* frame = GetPrimaryFrame(); if (!frame) { return -1.0; } if (nsLayoutUtils::FontSizeInflationEnabled(frame->PresContext())) { return nsLayoutUtils::FontSizeInflationFor(frame); } return 1.0; } void Element::GetImplementedPseudoElement(nsAString& aPseudo) const { PseudoStyleType pseudoType = GetPseudoElementType(); if (pseudoType == PseudoStyleType::NotPseudo) { return SetDOMStringToNull(aPseudo); } nsDependentAtomString pseudo(nsCSSPseudoElements::GetPseudoAtom(pseudoType)); // We want to use the modern syntax (::placeholder, etc), but the atoms only // contain one semi-colon. MOZ_ASSERT(pseudo.Length() > 2 && pseudo[0] == ':' && pseudo[1] != ':'); aPseudo.Truncate(); aPseudo.SetCapacity(pseudo.Length() + 1); aPseudo.Append(':'); aPseudo.Append(pseudo); } ReferrerPolicy Element::GetReferrerPolicyAsEnum() const { if (IsHTMLElement()) { return ReferrerPolicyFromAttr(GetParsedAttr(nsGkAtoms::referrerpolicy)); } return ReferrerPolicy::_empty; } ReferrerPolicy Element::ReferrerPolicyFromAttr( const nsAttrValue* aValue) const { if (aValue && aValue->Type() == nsAttrValue::eEnum) { return ReferrerPolicy(aValue->GetEnumValue()); } return ReferrerPolicy::_empty; } already_AddRefed Element::Dataset() { nsDOMSlots* slots = DOMSlots(); if (!slots->mDataset) { // mDataset is a weak reference so assignment will not AddRef. // AddRef is called before returning the pointer. slots->mDataset = new nsDOMStringMap(this); } RefPtr ret = slots->mDataset; return ret.forget(); } void Element::ClearDataset() { nsDOMSlots* slots = GetExistingDOMSlots(); MOZ_ASSERT(slots && slots->mDataset, "Slots should exist and dataset should not be null."); slots->mDataset = nullptr; } enum nsPreviousIntersectionThreshold { eUninitialized = -2, eNonIntersecting = -1 }; static void IntersectionObserverPropertyDtor(void* aObject, nsAtom* aPropertyName, void* aPropertyValue, void* aData) { auto* element = static_cast(aObject); auto* observers = static_cast(aPropertyValue); for (DOMIntersectionObserver* observer : observers->Keys()) { observer->UnlinkTarget(*element); } delete observers; } void Element::RegisterIntersectionObserver(DOMIntersectionObserver* aObserver) { IntersectionObserverList* observers = static_cast( GetProperty(nsGkAtoms::intersectionobserverlist)); if (!observers) { observers = new IntersectionObserverList(); observers->InsertOrUpdate(aObserver, eUninitialized); SetProperty(nsGkAtoms::intersectionobserverlist, observers, IntersectionObserverPropertyDtor, /* aTransfer = */ true); return; } // Value can be: // -2: Makes sure next calculated threshold always differs, leading to a // notification task being scheduled. // -1: Non-intersecting. // >= 0: Intersecting, valid index of aObserver->mThresholds. observers->LookupOrInsert(aObserver, eUninitialized); } void Element::UnregisterIntersectionObserver( DOMIntersectionObserver* aObserver) { auto* observers = static_cast( GetProperty(nsGkAtoms::intersectionobserverlist)); if (observers) { observers->Remove(aObserver); if (observers->IsEmpty()) { RemoveProperty(nsGkAtoms::intersectionobserverlist); } } } void Element::UnlinkIntersectionObservers() { // IntersectionObserverPropertyDtor takes care of the hard work. RemoveProperty(nsGkAtoms::intersectionobserverlist); } bool Element::UpdateIntersectionObservation(DOMIntersectionObserver* aObserver, int32_t aThreshold) { auto* observers = static_cast( GetProperty(nsGkAtoms::intersectionobserverlist)); if (!observers) { return false; } bool updated = false; if (auto entry = observers->Lookup(aObserver)) { updated = entry.Data() != aThreshold; entry.Data() = aThreshold; } return updated; } template void Element::GetCustomInterface(nsGetterAddRefs aResult) { nsCOMPtr iface = CustomElementRegistry::CallGetCustomInterface( this, NS_GET_TEMPLATE_IID(T)); if (iface) { if (NS_SUCCEEDED(CallQueryInterface(iface, static_cast(aResult)))) { return; } } } void Element::ClearServoData(Document* aDoc) { MOZ_ASSERT(aDoc); if (HasServoData()) { Servo_Element_ClearData(this); } else { UnsetFlags(kAllServoDescendantBits | NODE_NEEDS_FRAME); } // Since this element is losing its servo data, nothing under it may have // servo data either, so we can forget restyles rooted at this element. This // is necessary for correctness, since we invoke ClearServoData in various // places where an element's flattened tree parent changes, and such a change // may also make an element invalid to be used as a restyle root. if (aDoc->GetServoRestyleRoot() == this) { aDoc->ClearServoRestyleRoot(); } } bool Element::IsAutoPopover() const { const auto* htmlElement = nsGenericHTMLElement::FromNode(this); return htmlElement && htmlElement->GetPopoverAttributeState() == PopoverAttributeState::Auto; } bool Element::IsPopoverOpen() const { const auto* htmlElement = nsGenericHTMLElement::FromNode(this); return htmlElement && htmlElement->PopoverOpen(); } Element* Element::GetTopmostPopoverAncestor() const { const Element* newPopover = this; nsTHashMap, size_t> popoverPositions; size_t index = 0; for (Element* popover : OwnerDoc()->AutoPopoverList()) { popoverPositions.LookupOrInsert(popover, index++); } popoverPositions.LookupOrInsert(newPopover, index); Element* topmostPopoverAncestor = nullptr; auto checkAncestor = [&](const Element* candidate) { if (!candidate) { return; } Element* candidateAncestor = candidate->GetNearestInclusiveOpenPopover(); if (!candidateAncestor) { return; } size_t candidatePosition; if (popoverPositions.Get(candidateAncestor, &candidatePosition)) { size_t topmostPosition; if (!topmostPopoverAncestor || (popoverPositions.Get(topmostPopoverAncestor, &topmostPosition) && topmostPosition < candidatePosition)) { topmostPopoverAncestor = candidateAncestor; } } }; checkAncestor(newPopover->GetFlattenedTreeParentElement()); // https://github.com/whatwg/html/issues/9160 RefPtr invoker = newPopover->GetPopoverData()->GetInvoker(); checkAncestor(invoker); return topmostPopoverAncestor; } ElementAnimationData& Element::CreateAnimationData() { MOZ_ASSERT(!GetAnimationData()); SetMayHaveAnimations(); auto* slots = ExtendedDOMSlots(); slots->mAnimations = MakeUnique(); return *slots->mAnimations; } PopoverData& Element::CreatePopoverData() { MOZ_ASSERT(!GetPopoverData()); auto* slots = ExtendedDOMSlots(); slots->mPopoverData = MakeUnique(); return *slots->mPopoverData; } void Element::ClearPopoverData() { nsExtendedDOMSlots* slots = GetExistingExtendedDOMSlots(); if (slots) { slots->mPopoverData = nullptr; } } void Element::SetCustomElementData(UniquePtr aData) { SetHasCustomElementData(); if (aData->mState != CustomElementData::State::eCustom) { SetDefined(false); } nsExtendedDOMSlots* slots = ExtendedDOMSlots(); MOZ_ASSERT(!slots->mCustomElementData, "Custom element data may not be changed once set."); #if DEBUG // We assert only XUL usage, since web may pass whatever as 'is' value if (NodeInfo()->NamespaceID() == kNameSpaceID_XUL) { nsAtom* name = NodeInfo()->NameAtom(); nsAtom* type = aData->GetCustomElementType(); // Check to see if the tag name is a dashed name. if (nsContentUtils::IsNameWithDash(name)) { // Assert that a tag name with dashes is always an autonomous custom // element. MOZ_ASSERT(type == name); } else { // Could still be an autonomous custom element with a non-dashed tag name. // Need the check below for sure. if (type != name) { // Assert that the name of the built-in custom element type is always // a dashed name. MOZ_ASSERT(nsContentUtils::IsNameWithDash(type)); } } } #endif slots->mCustomElementData = std::move(aData); } CustomElementDefinition* Element::GetCustomElementDefinition() const { CustomElementData* data = GetCustomElementData(); if (!data) { return nullptr; } return data->GetCustomElementDefinition(); } void Element::SetCustomElementDefinition(CustomElementDefinition* aDefinition) { CustomElementData* data = GetCustomElementData(); MOZ_ASSERT(data); data->SetCustomElementDefinition(aDefinition); } already_AddRefed Element::AsXULButton() { nsCOMPtr value; GetCustomInterface(getter_AddRefs(value)); return value.forget(); } already_AddRefed Element::AsXULContainer() { nsCOMPtr value; GetCustomInterface(getter_AddRefs(value)); return value.forget(); } already_AddRefed Element::AsXULContainerItem() { nsCOMPtr value; GetCustomInterface(getter_AddRefs(value)); return value.forget(); } already_AddRefed Element::AsXULControl() { nsCOMPtr value; GetCustomInterface(getter_AddRefs(value)); return value.forget(); } already_AddRefed Element::AsXULMenuList() { nsCOMPtr value; GetCustomInterface(getter_AddRefs(value)); return value.forget(); } already_AddRefed Element::AsXULMultiSelectControl() { nsCOMPtr value; GetCustomInterface(getter_AddRefs(value)); return value.forget(); } already_AddRefed Element::AsXULRadioGroup() { nsCOMPtr value; GetCustomInterface(getter_AddRefs(value)); return value.forget(); } already_AddRefed Element::AsXULRelated() { nsCOMPtr value; GetCustomInterface(getter_AddRefs(value)); return value.forget(); } already_AddRefed Element::AsXULSelectControl() { nsCOMPtr value; GetCustomInterface(getter_AddRefs(value)); return value.forget(); } already_AddRefed Element::AsXULSelectControlItem() { nsCOMPtr value; GetCustomInterface(getter_AddRefs(value)); return value.forget(); } already_AddRefed Element::AsBrowser() { nsCOMPtr value; GetCustomInterface(getter_AddRefs(value)); return value.forget(); } already_AddRefed Element::AsAutoCompletePopup() { nsCOMPtr value; GetCustomInterface(getter_AddRefs(value)); return value.forget(); } nsPresContext* Element::GetPresContext(PresContextFor aFor) { // Get the document Document* doc = (aFor == eForComposedDoc) ? GetComposedDoc() : GetUncomposedDoc(); if (doc) { return doc->GetPresContext(); } return nullptr; } MOZ_DEFINE_MALLOC_SIZE_OF(ServoElementMallocSizeOf) MOZ_DEFINE_MALLOC_ENCLOSING_SIZE_OF(ServoElementMallocEnclosingSizeOf) void Element::AddSizeOfExcludingThis(nsWindowSizes& aSizes, size_t* aNodeSize) const { FragmentOrElement::AddSizeOfExcludingThis(aSizes, aNodeSize); *aNodeSize += mAttrs.SizeOfExcludingThis(aSizes.mState.mMallocSizeOf); if (HasServoData()) { // Measure the ElementData object itself. aSizes.mLayoutElementDataObjects += aSizes.mState.mMallocSizeOf(mServoData.Get()); // Measure mServoData, excluding the ComputedValues. This measurement // counts towards the element's size. We use ServoElementMallocSizeOf and // ServoElementMallocEnclosingSizeOf rather than |aState.mMallocSizeOf| to // better distinguish in DMD's output the memory measured within Servo // code. *aNodeSize += Servo_Element_SizeOfExcludingThisAndCVs( ServoElementMallocSizeOf, ServoElementMallocEnclosingSizeOf, &aSizes.mState.mSeenPtrs, this); // Now measure just the ComputedValues (and style structs) under // mServoData. This counts towards the relevant fields in |aSizes|. if (auto* style = Servo_Element_GetMaybeOutOfDateStyle(this)) { if (!aSizes.mState.HaveSeenPtr(style)) { style->AddSizeOfIncludingThis(aSizes, &aSizes.mLayoutComputedValuesDom); } for (size_t i = 0; i < PseudoStyle::kEagerPseudoCount; i++) { if (auto* style = Servo_Element_GetMaybeOutOfDatePseudoStyle(this, i)) { if (!aSizes.mState.HaveSeenPtr(style)) { style->AddSizeOfIncludingThis(aSizes, &aSizes.mLayoutComputedValuesDom); } } } } } } #ifdef DEBUG static bool BitsArePropagated(const Element* aElement, uint32_t aBits, nsINode* aRestyleRoot) { const Element* curr = aElement; while (curr) { if (curr == aRestyleRoot) { return true; } if (!curr->HasAllFlags(aBits)) { return false; } nsINode* parentNode = curr->GetParentNode(); curr = curr->GetFlattenedTreeParentElementForStyle(); MOZ_ASSERT_IF(!curr, parentNode == aElement->OwnerDoc() || parentNode == parentNode->OwnerDoc()->GetRootElement()); } return true; } #endif static inline void AssertNoBitsPropagatedFrom(nsINode* aRoot) { #ifdef DEBUG if (!aRoot || !aRoot->IsElement()) { return; } auto* element = aRoot->GetFlattenedTreeParentElementForStyle(); while (element) { MOZ_ASSERT(!element->HasAnyOfFlags(Element::kAllServoDescendantBits)); element = element->GetFlattenedTreeParentElementForStyle(); } #endif } // Sets `aBits` on `aElement` and all of its flattened-tree ancestors up to and // including aStopAt or the root element (whichever is encountered first), and // as long as `aBitsToStopAt` isn't found anywhere in the chain. static inline Element* PropagateBits(Element* aElement, uint32_t aBits, nsINode* aStopAt, uint32_t aBitsToStopAt) { Element* curr = aElement; while (curr && !curr->HasAllFlags(aBitsToStopAt)) { curr->SetFlags(aBits); if (curr == aStopAt) { break; } curr = curr->GetFlattenedTreeParentElementForStyle(); } if (aBitsToStopAt != aBits && curr) { curr->SetFlags(aBits); } return curr; } // Notes that a given element is "dirty" with respect to the given descendants // bit (which may be one of dirty descendants, dirty animation descendants, or // need frame construction for descendants). // // This function operates on the dirty element itself, despite the fact that the // bits are generally used to describe descendants. This allows restyle roots // to be scoped as tightly as possible. On the first call to NoteDirtyElement // since the last restyle, we don't set any descendant bits at all, and just set // the element as the restyle root. // // Because the style traversal handles multiple tasks (styling, // animation-ticking, and lazy frame construction), there are potentially three // separate kinds of dirtiness to track. Rather than maintaining three separate // restyle roots, we use a single root, and always bubble it up to be the // nearest common ancestor of all the dirty content in the tree. This means that // we need to track the types of dirtiness that the restyle root corresponds to, // so SetServoRestyleRoot accepts a bitfield along with an element. // // The overall algorithm is as follows: // * When the first dirty element is noted, we just set as the restyle root. // * When additional dirty elements are noted, we propagate the given bit up // the tree, until we either reach the restyle root or the document root. // * If we reach the document root, we then propagate the bits associated with // the restyle root up the tree until we cross the path of the new root. Once // we find this common ancestor, we record it as the restyle root, and then // clear the bits between the new restyle root and the document root. // * If we have dirty content beneath multiple "document style traversal roots" // (which are the main DOM + each piece of document-level native-anoymous // content), we set the restyle root to the nsINode of the document itself. // This is the bail-out case where we traverse everything. // // Note that, since we track a root, we try to optimize the case where an // element under the current root is dirtied, that's why we don't trivially use // `nsContentUtils::GetCommonFlattenedTreeAncestorForStyle`. static void NoteDirtyElement(Element* aElement, uint32_t aBits) { MOZ_ASSERT(aElement->IsInComposedDoc()); // Check the existing root early on, since it may allow us to short-circuit // before examining the parent chain. Document* doc = aElement->GetComposedDoc(); nsINode* existingRoot = doc->GetServoRestyleRoot(); if (existingRoot == aElement) { doc->SetServoRestyleRootDirtyBits(doc->GetServoRestyleRootDirtyBits() | aBits); return; } nsINode* parent = aElement->GetFlattenedTreeParentNodeForStyle(); if (!parent) { // The element is not in the flattened tree, bail. return; } if (MOZ_LIKELY(parent->IsElement())) { // If our parent is unstyled, we can inductively assume that it will be // traversed when the time is right, and that the traversal will reach us // when it happens. Nothing left to do. if (!parent->AsElement()->HasServoData()) { return; } // Similarly, if our parent already has the bit we're propagating, we can // assume everything is already set up. if (parent->HasAllFlags(aBits)) { return; } // If the parent is styled but is display:none, we're done. // // We can't check for a frame here, since elements inside // still need to generate a frame, even if they're display: none. :( // // The servo traversal doesn't keep style data under display: none subtrees, // so in order for it to not need to cleanup each time anything happens in a // display: none subtree, we keep it clean. // // Also, we can't be much more smarter about using the parent's frame in // order to avoid work here, because since the style system keeps style data // in, e.g., subtrees under a leaf frame, missing restyles and such in there // has observable behavior via getComputedStyle, for example. if (Servo_Element_IsDisplayNone(parent->AsElement())) { return; } } if (PresShell* presShell = doc->GetPresShell()) { presShell->EnsureStyleFlush(); } MOZ_ASSERT(parent->IsElement() || parent == doc); // The bit checks below rely on this to arrive to useful conclusions about the // shape of the tree. AssertNoBitsPropagatedFrom(existingRoot); // If there's no existing restyle root, or if the root is already aElement, // just note the root+bits and return. if (!existingRoot) { doc->SetServoRestyleRoot(aElement, aBits); return; } // There is an existing restyle root - walk up the tree from our element, // propagating bits as we go. const bool reachedDocRoot = !parent->IsElement() || !PropagateBits(parent->AsElement(), aBits, existingRoot, aBits); uint32_t existingBits = doc->GetServoRestyleRootDirtyBits(); if (!reachedDocRoot || existingRoot == doc) { // We're a descendant of the existing root. All that's left to do is to // make sure the bit we propagated is also registered on the root. doc->SetServoRestyleRoot(existingRoot, existingBits | aBits); } else { // We reached the root without crossing the pre-existing restyle root. We // now need to find the nearest common ancestor, so climb up from the // existing root, extending bits along the way. Element* rootParent = existingRoot->GetFlattenedTreeParentElementForStyle(); // We can stop at the first occurrence of `aBits` in order to find the // common ancestor. if (Element* commonAncestor = PropagateBits(rootParent, existingBits, aElement, aBits)) { MOZ_ASSERT(commonAncestor == aElement || commonAncestor == nsContentUtils::GetCommonFlattenedTreeAncestorForStyle( aElement, rootParent)); // We found a common ancestor. Make that the new style root, and clear the // bits between the new style root and the document root. doc->SetServoRestyleRoot(commonAncestor, existingBits | aBits); Element* curr = commonAncestor; while ((curr = curr->GetFlattenedTreeParentElementForStyle())) { MOZ_ASSERT(curr->HasAllFlags(aBits)); curr->UnsetFlags(aBits); } AssertNoBitsPropagatedFrom(commonAncestor); } else { // We didn't find a common ancestor element. That means we're descended // from two different document style roots, so the common ancestor is the // document. doc->SetServoRestyleRoot(doc, existingBits | aBits); } } // See the comment in Document::SetServoRestyleRoot about the !IsElement() // check there. Same justification here. MOZ_ASSERT(aElement == doc->GetServoRestyleRoot() || !doc->GetServoRestyleRoot()->IsElement() || nsContentUtils::ContentIsFlattenedTreeDescendantOfForStyle( aElement, doc->GetServoRestyleRoot())); MOZ_ASSERT(aElement == doc->GetServoRestyleRoot() || !doc->GetServoRestyleRoot()->IsElement() || !parent->IsElement() || BitsArePropagated(parent->AsElement(), aBits, doc->GetServoRestyleRoot())); MOZ_ASSERT(doc->GetServoRestyleRootDirtyBits() & aBits); } void Element::NoteDirtySubtreeForServo() { MOZ_ASSERT(IsInComposedDoc()); MOZ_ASSERT(HasServoData()); Document* doc = GetComposedDoc(); nsINode* existingRoot = doc->GetServoRestyleRoot(); uint32_t existingBits = existingRoot ? doc->GetServoRestyleRootDirtyBits() : 0; if (existingRoot && existingRoot->IsElement() && existingRoot != this && nsContentUtils::ContentIsFlattenedTreeDescendantOfForStyle( existingRoot->AsElement(), this)) { PropagateBits( existingRoot->AsElement()->GetFlattenedTreeParentElementForStyle(), existingBits, this, existingBits); doc->ClearServoRestyleRoot(); } NoteDirtyElement(this, existingBits | ELEMENT_HAS_DIRTY_DESCENDANTS_FOR_SERVO); } void Element::NoteDirtyForServo() { NoteDirtyElement(this, ELEMENT_HAS_DIRTY_DESCENDANTS_FOR_SERVO); } void Element::NoteAnimationOnlyDirtyForServo() { NoteDirtyElement(this, ELEMENT_HAS_ANIMATION_ONLY_DIRTY_DESCENDANTS_FOR_SERVO); } void Element::NoteDescendantsNeedFramesForServo() { // Since lazy frame construction can be required for non-element nodes, this // Note() method operates on the parent of the frame-requiring content, unlike // the other Note() methods above (which operate directly on the element that // needs processing). NoteDirtyElement(this, NODE_DESCENDANTS_NEED_FRAMES); SetFlags(NODE_DESCENDANTS_NEED_FRAMES); } double Element::FirstLineBoxBSize() const { const nsBlockFrame* frame = do_QueryFrame(GetPrimaryFrame()); if (!frame) { return 0.0; } nsBlockFrame::ConstLineIterator line = frame->LinesBegin(); nsBlockFrame::ConstLineIterator lineEnd = frame->LinesEnd(); return line != lineEnd ? nsPresContext::AppUnitsToDoubleCSSPixels(line->BSize()) : 0.0; } // static nsAtom* Element::GetEventNameForAttr(nsAtom* aAttr) { if (aAttr == nsGkAtoms::onwebkitanimationend) { return nsGkAtoms::onwebkitAnimationEnd; } if (aAttr == nsGkAtoms::onwebkitanimationiteration) { return nsGkAtoms::onwebkitAnimationIteration; } if (aAttr == nsGkAtoms::onwebkitanimationstart) { return nsGkAtoms::onwebkitAnimationStart; } if (aAttr == nsGkAtoms::onwebkittransitionend) { return nsGkAtoms::onwebkitTransitionEnd; } return aAttr; } void Element::RegUnRegAccessKey(bool aDoReg) { // first check to see if we have an access key nsAutoString accessKey; GetAttr(kNameSpaceID_None, nsGkAtoms::accesskey, accessKey); if (accessKey.IsEmpty()) { return; } // We have an access key, so get the ESM from the pres context. if (nsPresContext* presContext = GetPresContext(eForComposedDoc)) { EventStateManager* esm = presContext->EventStateManager(); // Register or unregister as appropriate. if (aDoReg) { esm->RegisterAccessKey(this, (uint32_t)accessKey.First()); } else { esm->UnregisterAccessKey(this, (uint32_t)accessKey.First()); } } } void Element::SetHTML(const nsAString& aInnerHTML, const SetHTMLOptions& aOptions, ErrorResult& aError) { // Throw for disallowed elements if (IsHTMLElement(nsGkAtoms::script)) { aError.ThrowTypeError("This does not work on