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| -rw-r--r-- | dom/base/Element.h | 2231 |
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diff --git a/dom/base/Element.h b/dom/base/Element.h new file mode 100644 index 0000000000..f146aa674f --- /dev/null +++ b/dom/base/Element.h @@ -0,0 +1,2231 @@ +/* -*- 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. + */ + +#ifndef mozilla_dom_Element_h__ +#define mozilla_dom_Element_h__ + +#include <cstdio> +#include <cstdint> +#include <cstdlib> +#include <utility> +#include "AttrArray.h" +#include "ErrorList.h" +#include "Units.h" +#include "js/RootingAPI.h" +#include "mozilla/AlreadyAddRefed.h" +#include "mozilla/Assertions.h" +#include "mozilla/Attributes.h" +#include "mozilla/BasicEvents.h" +#include "mozilla/CORSMode.h" +#include "mozilla/FlushType.h" +#include "mozilla/Maybe.h" +#include "mozilla/PseudoStyleType.h" +#include "mozilla/RefPtr.h" +#include "mozilla/Result.h" +#include "mozilla/RustCell.h" +#include "mozilla/UniquePtr.h" +#include "mozilla/dom/BorrowedAttrInfo.h" +#include "mozilla/dom/DOMString.h" +#include "mozilla/dom/DirectionalityUtils.h" +#include "mozilla/dom/FragmentOrElement.h" +#include "mozilla/dom/NameSpaceConstants.h" +#include "mozilla/dom/NodeInfo.h" +#include "mozilla/dom/RustTypes.h" +#include "mozilla/dom/ShadowRootBinding.h" +#include "nsAtom.h" +#include "nsAttrValue.h" +#include "nsAttrValueInlines.h" +#include "nsCaseTreatment.h" +#include "nsChangeHint.h" +#include "nsTHashMap.h" +#include "nsDebug.h" +#include "nsError.h" +#include "nsGkAtoms.h" +#include "nsHashKeys.h" +#include "nsIContent.h" +#include "nsID.h" +#include "nsINode.h" +#include "nsLiteralString.h" +#include "nsRect.h" +#include "nsString.h" +#include "nsStringFlags.h" +#include "nsTLiteralString.h" +#include "nscore.h" + +class JSObject; +class mozAutoDocUpdate; +class nsAttrName; +class nsAttrValueOrString; +class nsContentList; +class nsDOMAttributeMap; +class nsDOMCSSAttributeDeclaration; +class nsDOMStringMap; +class nsDOMTokenList; +class nsFocusManager; +class nsGlobalWindowInner; +class nsGlobalWindowOuter; +class nsIAutoCompletePopup; +class nsIBrowser; +class nsIDOMXULButtonElement; +class nsIDOMXULContainerElement; +class nsIDOMXULContainerItemElement; +class nsIDOMXULControlElement; +class nsIDOMXULMenuListElement; +class nsIDOMXULMultiSelectControlElement; +class nsIDOMXULRadioGroupElement; +class nsIDOMXULRelatedElement; +class nsIDOMXULSelectControlElement; +class nsIDOMXULSelectControlItemElement; +class nsIFrame; +class nsIHTMLCollection; +class nsIMozBrowserFrame; +class nsIPrincipal; +class nsIScrollableFrame; +class nsIURI; +class nsMappedAttributes; +class nsPresContext; +class nsWindowSizes; +struct JSContext; +struct ServoNodeData; +template <class E> +class nsTArray; +template <class T> +class nsGetterAddRefs; + +namespace mozilla { +class DeclarationBlock; +class ErrorResult; +class OOMReporter; +class SMILAttr; +struct MutationClosureData; +class TextEditor; +namespace css { +struct URLValue; +} // namespace css +namespace dom { +struct CheckVisibilityOptions; +struct CustomElementData; +struct SetHTMLOptions; +struct GetAnimationsOptions; +struct ScrollIntoViewOptions; +struct ScrollToOptions; +struct FocusOptions; +struct ShadowRootInit; +struct ScrollOptions; +class Attr; +class BooleanOrScrollIntoViewOptions; +class Document; +class DOMIntersectionObserver; +class DOMMatrixReadOnly; +class Element; +class ElementOrCSSPseudoElement; +class Promise; +class Sanitizer; +class ShadowRoot; +class UnrestrictedDoubleOrKeyframeAnimationOptions; +template <typename T> +class Optional; +enum class CallerType : uint32_t; +enum class ReferrerPolicy : uint8_t; +typedef nsTHashMap<nsRefPtrHashKey<DOMIntersectionObserver>, int32_t> + IntersectionObserverList; +} // namespace dom +} // namespace mozilla + +// Declared here because of include hell. +extern "C" bool Servo_Element_IsDisplayContents(const mozilla::dom::Element*); + +already_AddRefed<nsContentList> NS_GetContentList(nsINode* aRootNode, + int32_t aMatchNameSpaceId, + const nsAString& aTagname); + +#define ELEMENT_FLAG_BIT(n_) \ + NODE_FLAG_BIT(NODE_TYPE_SPECIFIC_BITS_OFFSET + (n_)) + +// Element-specific flags +enum { + // Whether this node has dirty descendants for Servo's style system. + ELEMENT_HAS_DIRTY_DESCENDANTS_FOR_SERVO = ELEMENT_FLAG_BIT(0), + // Whether this node has dirty descendants for animation-only restyle for + // Servo's style system. + ELEMENT_HAS_ANIMATION_ONLY_DIRTY_DESCENDANTS_FOR_SERVO = ELEMENT_FLAG_BIT(1), + + // Whether the element has been snapshotted due to attribute or state changes + // by the Servo restyle manager. + ELEMENT_HAS_SNAPSHOT = ELEMENT_FLAG_BIT(2), + + // Whether the element has already handled its relevant snapshot. + // + // Used by the servo restyle process in order to accurately track whether the + // style of an element is up-to-date, even during the same restyle process. + ELEMENT_HANDLED_SNAPSHOT = ELEMENT_FLAG_BIT(3), + + // If this flag is set on an element, that means that it is a HTML datalist + // element or has a HTML datalist element ancestor. + ELEMENT_IS_DATALIST_OR_HAS_DATALIST_ANCESTOR = ELEMENT_FLAG_BIT(4), + + // Remaining bits are for subclasses + ELEMENT_TYPE_SPECIFIC_BITS_OFFSET = NODE_TYPE_SPECIFIC_BITS_OFFSET + 5 +}; + +#undef ELEMENT_FLAG_BIT + +// Make sure we have space for our bits +ASSERT_NODE_FLAGS_SPACE(ELEMENT_TYPE_SPECIFIC_BITS_OFFSET); + +namespace mozilla { +enum class PseudoStyleType : uint8_t; +class EventChainPostVisitor; +class EventChainPreVisitor; +class EventChainVisitor; +class EventListenerManager; +class EventStateManager; + +namespace dom { + +struct CustomElementDefinition; +class Animation; +class CustomElementRegistry; +class Link; +class DOMRect; +class DOMRectList; +class Flex; +class Grid; + +// IID for the dom::Element interface +#define NS_ELEMENT_IID \ + { \ + 0xc67ed254, 0xfd3b, 0x4b10, { \ + 0x96, 0xa2, 0xc5, 0x8b, 0x7b, 0x64, 0x97, 0xd1 \ + } \ + } + +#define REFLECT_DOMSTRING_ATTR(method, attr) \ + void Get##method(nsAString& aValue) const { \ + GetAttr(nsGkAtoms::attr, aValue); \ + } \ + void Set##method(const nsAString& aValue, ErrorResult& aRv) { \ + SetAttr(nsGkAtoms::attr, aValue, aRv); \ + } + +class Element : public FragmentOrElement { + public: +#ifdef MOZILLA_INTERNAL_API + explicit Element(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo) + : FragmentOrElement(std::move(aNodeInfo)), + mState(ElementState::READONLY | ElementState::DEFINED) { + MOZ_ASSERT(mNodeInfo->NodeType() == ELEMENT_NODE, + "Bad NodeType in aNodeInfo"); + SetIsElement(); + } + + ~Element() { + NS_ASSERTION(!HasServoData(), "expected ServoData to be cleared earlier"); + } + +#endif // MOZILLA_INTERNAL_API + + NS_DECLARE_STATIC_IID_ACCESSOR(NS_ELEMENT_IID) + + NS_DECL_ADDSIZEOFEXCLUDINGTHIS + + NS_IMPL_FROMNODE_HELPER(Element, IsElement()) + + NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) override; + + /** + * Method to get the full state of this element. See dom/base/rust/lib.rs for + * the possible bits that could be set here. + */ + ElementState State() const { + // mState is maintained by having whoever might have changed it + // call UpdateState() or one of the other mState mutators. + return mState; + } + + /** + * Ask this element to update its state. If aNotify is false, then + * state change notifications will not be dispatched; in that + * situation it is the caller's responsibility to dispatch them. + * + * In general, aNotify should only be false if we're guaranteed that + * the element can't have a frame no matter what its style is + * (e.g. if we're in the middle of adding it to the document or + * removing it from the document). + */ + void UpdateState(bool aNotify); + + /** + * Method to update mState with link state information. This does not notify. + */ + void UpdateLinkState(ElementState aState); + + /** + * Returns the current disabled state of the element. + */ + bool IsDisabled() const { return State().HasState(ElementState::DISABLED); } + + virtual int32_t TabIndexDefault() { return -1; } + + /** + * Get tabIndex of this element. If not found, return TabIndexDefault. + */ + int32_t TabIndex(); + + /** + * Get the parsed value of tabindex attribute. + */ + Maybe<int32_t> GetTabIndexAttrValue(); + + /** + * Set tabIndex value to this element. + */ + void SetTabIndex(int32_t aTabIndex, mozilla::ErrorResult& aError); + + /** + * Sets the ShadowRoot binding for this element. The contents of the + * binding is rendered in place of this node's children. + * + * @param aShadowRoot The ShadowRoot to be bound to this element. + */ + void SetShadowRoot(ShadowRoot* aShadowRoot); + + void SetLastRememberedBSize(float aBSize); + void SetLastRememberedISize(float aISize); + void RemoveLastRememberedBSize(); + void RemoveLastRememberedISize(); + + /** + * Make focus on this element. + */ + // TODO: Convert Focus() to MOZ_CAN_RUN_SCRIPT and get rid of the + // kungFuDeathGrip in it. + MOZ_CAN_RUN_SCRIPT_BOUNDARY virtual void Focus(const FocusOptions& aOptions, + const CallerType aCallerType, + ErrorResult& aError); + + /** + * Show blur and clear focus. + */ + MOZ_CAN_RUN_SCRIPT_BOUNDARY virtual void Blur(mozilla::ErrorResult& aError); + + /** + * The style state of this element. This is the real state of the element + * with any style locks applied for pseudo-class inspecting. + */ + ElementState StyleState() const { + if (!HasLockedStyleStates()) { + return mState; + } + return StyleStateFromLocks(); + } + + /** + * StyleStateLocks is used to specify which event states should be locked, + * and whether they should be locked to on or off. + */ + struct StyleStateLocks { + // mLocks tracks which event states should be locked. + ElementState mLocks; + // mValues tracks if the locked state should be on or off. + ElementState mValues; + }; + + /** + * The style state locks applied to this element. + */ + StyleStateLocks LockedStyleStates() const; + + /** + * Add a style state lock on this element. + * aEnabled is the value to lock the given state bits to. + */ + void LockStyleStates(ElementState aStates, bool aEnabled); + + /** + * Remove a style state lock on this element. + */ + void UnlockStyleStates(ElementState aStates); + + /** + * Clear all style state locks on this element. + */ + void ClearStyleStateLocks(); + + /** + * Accessors for the state of our dir attribute. + */ + bool HasDirAuto() const { + return State().HasState(ElementState::HAS_DIR_ATTR_LIKE_AUTO); + } + + /** + * Elements with dir="rtl" or dir="ltr". + */ + bool HasFixedDir() const { + return State().HasAtLeastOneOfStates(ElementState::HAS_DIR_ATTR_LTR | + ElementState::HAS_DIR_ATTR_RTL); + } + + /** + * Get the inline style declaration, if any, for this element. + */ + DeclarationBlock* GetInlineStyleDeclaration() const; + + /** + * Get the mapped attributes, if any, for this element. + */ + const nsMappedAttributes* GetMappedAttributes() const; + + void ClearMappedServoStyle() { mAttrs.ClearMappedServoStyle(); } + + /** + * InlineStyleDeclarationWillChange is called before SetInlineStyleDeclaration + * so that the element implementation can access the old style attribute + * value. + */ + virtual void InlineStyleDeclarationWillChange(MutationClosureData& aData); + + /** + * Set the inline style declaration for this element. + */ + virtual nsresult SetInlineStyleDeclaration(DeclarationBlock& aDeclaration, + MutationClosureData& aData); + + /** + * Get the SMIL override style declaration for this element. If the + * rule hasn't been created, this method simply returns null. + */ + DeclarationBlock* GetSMILOverrideStyleDeclaration(); + + /** + * Set the SMIL override style declaration for this element. This method will + * notify the document's pres context, so that the style changes will be + * noticed. + */ + void SetSMILOverrideStyleDeclaration(DeclarationBlock&); + + /** + * Returns a new SMILAttr that allows the caller to animate the given + * attribute on this element. + */ + virtual UniquePtr<SMILAttr> GetAnimatedAttr(int32_t aNamespaceID, + nsAtom* aName); + + /** + * Get the SMIL override style for this element. This is a style declaration + * that is applied *after* the inline style, and it can be used e.g. to store + * animated style values. + * + * Note: This method is analogous to the 'GetStyle' method in + * nsGenericHTMLElement and nsStyledElement. + */ + nsDOMCSSAttributeDeclaration* SMILOverrideStyle(); + + /** + * Returns if the element is labelable as per HTML specification. + */ + virtual bool IsLabelable() const; + + /** + * Returns if the element is interactive content as per HTML specification. + */ + virtual bool IsInteractiveHTMLContent() const; + + /** + * Returns |this| as an nsIMozBrowserFrame* if the element is a frame or + * iframe element. + * + * We have this method, rather than using QI, so that we can use it during + * the servo traversal, where we can't QI DOM nodes because of non-thread-safe + * refcounts. + */ + virtual nsIMozBrowserFrame* GetAsMozBrowserFrame() { return nullptr; } + + /** + * Is the attribute named stored in the mapped attributes? + * + * // XXXbz we use this method in HasAttributeDependentStyle, so svg + * returns true here even though it stores nothing in the mapped + * attributes. + */ + NS_IMETHOD_(bool) IsAttributeMapped(const nsAtom* aAttribute) const; + + /** + * Get a hint that tells the style system what to do when + * an attribute on this node changes, if something needs to happen + * in response to the change *other* than the result of what is + * mapped into style data via any type of style rule. + */ + virtual nsChangeHint GetAttributeChangeHint(const nsAtom* aAttribute, + int32_t aModType) const; + + inline Directionality GetDirectionality() const { + if (HasFlag(NODE_HAS_DIRECTION_RTL)) { + return eDir_RTL; + } + + if (HasFlag(NODE_HAS_DIRECTION_LTR)) { + return eDir_LTR; + } + + return eDir_NotSet; + } + + inline void SetDirectionality(Directionality aDir, bool aNotify) { + UnsetFlags(NODE_ALL_DIRECTION_FLAGS); + if (!aNotify) { + RemoveStatesSilently(ElementState::DIR_STATES); + } + + switch (aDir) { + case (eDir_RTL): + SetFlags(NODE_HAS_DIRECTION_RTL); + if (!aNotify) { + AddStatesSilently(ElementState::RTL); + } + break; + + case (eDir_LTR): + SetFlags(NODE_HAS_DIRECTION_LTR); + if (!aNotify) { + AddStatesSilently(ElementState::LTR); + } + break; + + default: + break; + } + + /* + * Only call UpdateState if we need to notify, because we call + * SetDirectionality for every element, and UpdateState is very very slow + * for some elements. + */ + if (aNotify) { + UpdateState(true); + } + } + + Directionality GetComputedDirectionality() const; + + static const uint32_t kAllServoDescendantBits = + ELEMENT_HAS_DIRTY_DESCENDANTS_FOR_SERVO | + ELEMENT_HAS_ANIMATION_ONLY_DIRTY_DESCENDANTS_FOR_SERVO | + NODE_DESCENDANTS_NEED_FRAMES; + + /** + * Notes that something in the given subtree of this element needs dirtying, + * and that all the relevant dirty bits have already been propagated up to the + * element. + * + * This is important because `NoteDirtyForServo` uses the dirty bits to reason + * about the shape of the tree, so we can't just call into there. + */ + void NoteDirtySubtreeForServo(); + + void NoteDirtyForServo(); + void NoteAnimationOnlyDirtyForServo(); + void NoteDescendantsNeedFramesForServo(); + + bool HasDirtyDescendantsForServo() const { + return HasFlag(ELEMENT_HAS_DIRTY_DESCENDANTS_FOR_SERVO); + } + + void SetHasDirtyDescendantsForServo() { + SetFlags(ELEMENT_HAS_DIRTY_DESCENDANTS_FOR_SERVO); + } + + void UnsetHasDirtyDescendantsForServo() { + UnsetFlags(ELEMENT_HAS_DIRTY_DESCENDANTS_FOR_SERVO); + } + + bool HasAnimationOnlyDirtyDescendantsForServo() const { + return HasFlag(ELEMENT_HAS_ANIMATION_ONLY_DIRTY_DESCENDANTS_FOR_SERVO); + } + + void SetHasAnimationOnlyDirtyDescendantsForServo() { + SetFlags(ELEMENT_HAS_ANIMATION_ONLY_DIRTY_DESCENDANTS_FOR_SERVO); + } + + void UnsetHasAnimationOnlyDirtyDescendantsForServo() { + UnsetFlags(ELEMENT_HAS_ANIMATION_ONLY_DIRTY_DESCENDANTS_FOR_SERVO); + } + + bool HasServoData() const { return !!mServoData.Get(); } + + void ClearServoData() { ClearServoData(GetComposedDoc()); } + void ClearServoData(Document* aDocument); + + /** + * Gets the custom element data used by web components custom element. + * Custom element data is created at the first attempt to enqueue a callback. + * + * @return The custom element data or null if none. + */ + inline CustomElementData* GetCustomElementData() const { + if (!HasCustomElementData()) { + return nullptr; + } + + const nsExtendedDOMSlots* slots = GetExistingExtendedDOMSlots(); + return slots ? slots->mCustomElementData.get() : nullptr; + } + + /** + * Sets the custom element data, ownership of the + * callback data is taken by this element. + * + * @param aData The custom element data. + */ + void SetCustomElementData(UniquePtr<CustomElementData> aData); + + /** + * Gets the custom element definition used by web components custom element. + * + * @return The custom element definition or null if element is not a custom + * element or custom element is not defined yet. + */ + CustomElementDefinition* GetCustomElementDefinition() const; + + /** + * Sets the custom element definition, called when custom element is created + * or upgraded. + * + * @param aDefinition The custom element definition. + */ + virtual void SetCustomElementDefinition(CustomElementDefinition* aDefinition); + + const AttrArray& GetAttrs() const { return mAttrs; } + + void SetDefined(bool aSet) { + if (aSet) { + AddStates(ElementState::DEFINED); + } else { + RemoveStates(ElementState::DEFINED); + } + } + + // AccessibilityRole + REFLECT_DOMSTRING_ATTR(Role, role) + + // AriaAttributes + REFLECT_DOMSTRING_ATTR(AriaAtomic, aria_atomic) + REFLECT_DOMSTRING_ATTR(AriaAutoComplete, aria_autocomplete) + REFLECT_DOMSTRING_ATTR(AriaBusy, aria_busy) + REFLECT_DOMSTRING_ATTR(AriaChecked, aria_checked) + REFLECT_DOMSTRING_ATTR(AriaColCount, aria_colcount) + REFLECT_DOMSTRING_ATTR(AriaColIndex, aria_colindex) + REFLECT_DOMSTRING_ATTR(AriaColIndexText, aria_colindextext) + REFLECT_DOMSTRING_ATTR(AriaColSpan, aria_colspan) + REFLECT_DOMSTRING_ATTR(AriaCurrent, aria_current) + REFLECT_DOMSTRING_ATTR(AriaDescription, aria_description) + REFLECT_DOMSTRING_ATTR(AriaDisabled, aria_disabled) + REFLECT_DOMSTRING_ATTR(AriaExpanded, aria_expanded) + REFLECT_DOMSTRING_ATTR(AriaHasPopup, aria_haspopup) + REFLECT_DOMSTRING_ATTR(AriaHidden, aria_hidden) + REFLECT_DOMSTRING_ATTR(AriaInvalid, aria_invalid) + REFLECT_DOMSTRING_ATTR(AriaKeyShortcuts, aria_keyshortcuts) + REFLECT_DOMSTRING_ATTR(AriaLabel, aria_label) + REFLECT_DOMSTRING_ATTR(AriaLevel, aria_level) + REFLECT_DOMSTRING_ATTR(AriaLive, aria_live) + REFLECT_DOMSTRING_ATTR(AriaModal, aria_modal) + REFLECT_DOMSTRING_ATTR(AriaMultiLine, aria_multiline) + REFLECT_DOMSTRING_ATTR(AriaMultiSelectable, aria_multiselectable) + REFLECT_DOMSTRING_ATTR(AriaOrientation, aria_orientation) + REFLECT_DOMSTRING_ATTR(AriaPlaceholder, aria_placeholder) + REFLECT_DOMSTRING_ATTR(AriaPosInSet, aria_posinset) + REFLECT_DOMSTRING_ATTR(AriaPressed, aria_pressed) + REFLECT_DOMSTRING_ATTR(AriaReadOnly, aria_readonly) + REFLECT_DOMSTRING_ATTR(AriaRelevant, aria_relevant) + REFLECT_DOMSTRING_ATTR(AriaRequired, aria_required) + REFLECT_DOMSTRING_ATTR(AriaRoleDescription, aria_roledescription) + REFLECT_DOMSTRING_ATTR(AriaRowCount, aria_rowcount) + REFLECT_DOMSTRING_ATTR(AriaRowIndex, aria_rowindex) + REFLECT_DOMSTRING_ATTR(AriaRowIndexText, aria_rowindextext) + REFLECT_DOMSTRING_ATTR(AriaRowSpan, aria_rowspan) + REFLECT_DOMSTRING_ATTR(AriaSelected, aria_selected) + REFLECT_DOMSTRING_ATTR(AriaSetSize, aria_setsize) + REFLECT_DOMSTRING_ATTR(AriaSort, aria_sort) + REFLECT_DOMSTRING_ATTR(AriaValueMax, aria_valuemax) + REFLECT_DOMSTRING_ATTR(AriaValueMin, aria_valuemin) + REFLECT_DOMSTRING_ATTR(AriaValueNow, aria_valuenow) + REFLECT_DOMSTRING_ATTR(AriaValueText, aria_valuetext) + + protected: + /** + * Method to get the _intrinsic_ content state of this element. This is the + * state that is independent of the element's presentation. To get the full + * the possible bits that could be set here. + */ + virtual ElementState IntrinsicState() const; + + /** + * Method to add state bits. This should be called from subclass + * constructors to set up our event state correctly at construction + * time and other places where we don't want to notify a state + * change. + */ + void AddStatesSilently(ElementState aStates) { mState |= aStates; } + + /** + * Method to remove state bits. This should be called from subclass + * constructors to set up our event state correctly at construction + * time and other places where we don't want to notify a state + * change. + */ + void RemoveStatesSilently(ElementState aStates) { mState &= ~aStates; } + + already_AddRefed<ShadowRoot> AttachShadowInternal(ShadowRootMode, + ErrorResult& aError); + + public: + MOZ_CAN_RUN_SCRIPT + nsIScrollableFrame* GetScrollFrame(nsIFrame** aStyledFrame = nullptr, + FlushType aFlushType = FlushType::Layout); + + private: + // Need to allow the ESM, nsGlobalWindow, and the focus manager + // and Document to set our state + friend class mozilla::EventStateManager; + friend class mozilla::dom::Document; + friend class ::nsGlobalWindowInner; + friend class ::nsGlobalWindowOuter; + friend class ::nsFocusManager; + + // Allow CusomtElementRegistry to call AddStates. + friend class CustomElementRegistry; + + // Also need to allow Link to call UpdateLinkState. + friend class Link; + + void NotifyStateChange(ElementState aStates); + + void NotifyStyleStateChange(ElementState aStates); + + // Style state computed from element's state and style locks. + ElementState StyleStateFromLocks() const; + + protected: + // Methods for the ESM, nsGlobalWindow, focus manager and Document to + // manage state bits. + // These will handle setting up script blockers when they notify, so no need + // to do it in the callers unless desired. States passed here must only be + // those in EXTERNALLY_MANAGED_STATES. + void AddStates(ElementState aStates) { + MOZ_ASSERT(!aStates.HasAtLeastOneOfStates(ElementState::INTRINSIC_STATES), + "Should only be adding externally-managed states here"); + ElementState old = mState; + AddStatesSilently(aStates); + NotifyStateChange(old ^ mState); + } + void RemoveStates(ElementState aStates) { + MOZ_ASSERT(!aStates.HasAtLeastOneOfStates(ElementState::INTRINSIC_STATES), + "Should only be removing externally-managed states here"); + ElementState old = mState; + RemoveStatesSilently(aStates); + NotifyStateChange(old ^ mState); + } + void ToggleStates(ElementState aStates, bool aNotify) { + MOZ_ASSERT(!aStates.HasAtLeastOneOfStates(ElementState::INTRINSIC_STATES), + "Should only be removing externally-managed states here"); + mState ^= aStates; + if (aNotify) { + NotifyStateChange(aStates); + } + } + + public: + // Public methods to manage state bits in MANUALLY_MANAGED_STATES. + void AddManuallyManagedStates(ElementState aStates) { + MOZ_ASSERT(ElementState::MANUALLY_MANAGED_STATES.HasAllStates(aStates), + "Should only be adding manually-managed states here"); + AddStates(aStates); + } + void RemoveManuallyManagedStates(ElementState aStates) { + MOZ_ASSERT(ElementState::MANUALLY_MANAGED_STATES.HasAllStates(aStates), + "Should only be removing manually-managed states here"); + RemoveStates(aStates); + } + + void UpdateEditableState(bool aNotify) override; + + nsresult BindToTree(BindContext&, nsINode& aParent) override; + + void UnbindFromTree(bool aNullParent = true) override; + + /** + * Normalizes an attribute name and returns it as a nodeinfo if an attribute + * with that name exists. This method is intended for character case + * conversion if the content object is case insensitive (e.g. HTML). Returns + * the nodeinfo of the attribute with the specified name if one exists or + * null otherwise. + * + * @param aStr the unparsed attribute string + * @return the node info. May be nullptr. + */ + already_AddRefed<mozilla::dom::NodeInfo> GetExistingAttrNameFromQName( + const nsAString& aStr) const; + + /** + * Helper for SetAttr/SetParsedAttr. This method will return true if aNotify + * is true or there are mutation listeners that must be triggered, the + * attribute is currently set, and the new value that is about to be set is + * different to the current value. As a perf optimization the new and old + * values will not actually be compared if we aren't notifying and we don't + * have mutation listeners (in which case it's cheap to just return false + * and let the caller go ahead and set the value). + * @param aOldValue [out] Set to the old value of the attribute, but only if + * there are event listeners. If set, the type of aOldValue will be either + * nsAttrValue::eString or nsAttrValue::eAtom. + * @param aModType [out] Set to MutationEvent_Binding::MODIFICATION or to + * MutationEvent_Binding::ADDITION, but only if this helper returns true + * @param aHasListeners [out] Set to true if there are mutation event + * listeners listening for NS_EVENT_BITS_MUTATION_ATTRMODIFIED + * @param aOldValueSet [out] Indicates whether an old attribute value has been + * stored in aOldValue. The bool will be set to true if a value was stored. + */ + bool MaybeCheckSameAttrVal(int32_t aNamespaceID, const nsAtom* aName, + const nsAtom* aPrefix, + const nsAttrValueOrString& aValue, bool aNotify, + nsAttrValue& aOldValue, uint8_t* aModType, + bool* aHasListeners, bool* aOldValueSet); + + /** + * Notifies mutation listeners if aNotify is true, there are mutation + * listeners, and the attribute value is changing. + * + * @param aNamespaceID The namespace of the attribute + * @param aName The local name of the attribute + * @param aPrefix The prefix of the attribute + * @param aValue The value that the attribute is being changed to + * @param aNotify If true, mutation listeners will be notified if they exist + * and the attribute value is changing + * @param aOldValue [out] Set to the old value of the attribute, but only if + * there are event listeners. If set, the type of aOldValue will be either + * nsAttrValue::eString or nsAttrValue::eAtom. + * @param aModType [out] Set to MutationEvent_Binding::MODIFICATION or to + * MutationEvent_Binding::ADDITION, but only if this helper returns true + * @param aHasListeners [out] Set to true if there are mutation event + * listeners listening for NS_EVENT_BITS_MUTATION_ATTRMODIFIED + * @param aOldValueSet [out] Indicates whether an old attribute value has been + * stored in aOldValue. The bool will be set to true if a value was stored. + */ + bool OnlyNotifySameValueSet(int32_t aNamespaceID, nsAtom* aName, + nsAtom* aPrefix, + const nsAttrValueOrString& aValue, bool aNotify, + nsAttrValue& aOldValue, uint8_t* aModType, + bool* aHasListeners, bool* aOldValueSet); + + /** + * Sets the class attribute to a value that contains no whitespace. + * Assumes that we are not notifying and that the attribute hasn't been + * set previously. + */ + nsresult SetSingleClassFromParser(nsAtom* aSingleClassName); + + // aParsedValue receives the old value of the attribute. That's useful if + // either the input or output value of aParsedValue is StoresOwnData. + nsresult SetParsedAttr(int32_t aNameSpaceID, nsAtom* aName, nsAtom* aPrefix, + nsAttrValue& aParsedValue, bool aNotify); + /** + * Get the current value of the attribute. This returns a form that is + * suitable for passing back into SetAttr. + * + * @param aNameSpaceID the namespace of the attr (defaults to + kNameSpaceID_None in the overload that omits this arg) + * @param aName the name of the attr + * @param aResult the value (may legitimately be the empty string) [OUT] + * @returns true if the attribute was set (even when set to empty string) + * false when not set. + * GetAttr is not inlined on purpose, to keep down codesize from all the + * inlined nsAttrValue bits for C++ callers. + */ + bool GetAttr(int32_t aNameSpaceID, const nsAtom* aName, + nsAString& aResult) const; + + bool GetAttr(const nsAtom* aName, nsAString& aResult) const { + return GetAttr(kNameSpaceID_None, aName, aResult); + } + + /** + * Determine if an attribute has been set (empty string or otherwise). + * + * @param aNameSpaceId the namespace id of the attribute (defaults to + kNameSpaceID_None in the overload that omits this arg) + * @param aAttr the attribute name + * @return whether an attribute exists + */ + inline bool HasAttr(int32_t aNameSpaceID, const nsAtom* aName) const; + + bool HasAttr(const nsAtom* aAttr) const { + return HasAttr(kNameSpaceID_None, aAttr); + } + + /** + * Determine if an attribute has been set to a non-empty string value. If the + * attribute is not set at all, this will return false. + * + * @param aNameSpaceId the namespace id of the attribute (defaults to + * kNameSpaceID_None in the overload that omits this arg) + * @param aAttr the attribute name + */ + inline bool HasNonEmptyAttr(int32_t aNameSpaceID, const nsAtom* aName) const; + + bool HasNonEmptyAttr(const nsAtom* aAttr) const { + return HasNonEmptyAttr(kNameSpaceID_None, aAttr); + } + + /** + * Test whether this Element's given attribute has the given value. If the + * attribute is not set at all, this will return false. + * + * @param aNameSpaceID The namespace ID of the attribute. Must not + * be kNameSpaceID_Unknown. + * @param aName The name atom of the attribute. Must not be null. + * @param aValue The value to compare to. + * @param aCaseSensitive Whether to do a case-sensitive compare on the value. + */ + inline bool AttrValueIs(int32_t aNameSpaceID, const nsAtom* aName, + const nsAString& aValue, + nsCaseTreatment aCaseSensitive) const; + + /** + * Test whether this Element's given attribute has the given value. If the + * attribute is not set at all, this will return false. + * + * @param aNameSpaceID The namespace ID of the attribute. Must not + * be kNameSpaceID_Unknown. + * @param aName The name atom of the attribute. Must not be null. + * @param aValue The value to compare to. Must not be null. + * @param aCaseSensitive Whether to do a case-sensitive compare on the value. + */ + bool AttrValueIs(int32_t aNameSpaceID, const nsAtom* aName, + const nsAtom* aValue, nsCaseTreatment aCaseSensitive) const; + + /** + * Check whether this Element's given attribute has one of a given list of + * values. If there is a match, we return the index in the list of the first + * matching value. If there was no attribute at all, then we return + * ATTR_MISSING. If there was an attribute but it didn't match, we return + * ATTR_VALUE_NO_MATCH. A non-negative result always indicates a match. + * + * @param aNameSpaceID The namespace ID of the attribute. Must not + * be kNameSpaceID_Unknown. + * @param aName The name atom of the attribute. Must not be null. + * @param aValues a nullptr-terminated array of pointers to atom values to + * test against. + * @param aCaseSensitive Whether to do a case-sensitive compare on the values. + * @return ATTR_MISSING, ATTR_VALUE_NO_MATCH or the non-negative index + * indicating the first value of aValues that matched + */ + using AttrValuesArray = AttrArray::AttrValuesArray; + int32_t FindAttrValueIn(int32_t aNameSpaceID, const nsAtom* aName, + AttrArray::AttrValuesArray* aValues, + nsCaseTreatment aCaseSensitive) const; + + /** + * Set attribute values. All attribute values are assumed to have a + * canonical string representation that can be used for these + * methods. The SetAttr method is assumed to perform a translation + * of the canonical form into the underlying content specific + * form. + * + * @param aNameSpaceID the namespace of the attribute + * @param aName the name of the attribute + * @param aValue the value to set + * @param aNotify specifies how whether or not the document should be + * notified of the attribute change. + */ + nsresult SetAttr(int32_t aNameSpaceID, nsAtom* aName, const nsAString& aValue, + bool aNotify) { + return SetAttr(aNameSpaceID, aName, nullptr, aValue, aNotify); + } + nsresult SetAttr(int32_t aNameSpaceID, nsAtom* aName, nsAtom* aPrefix, + const nsAString& aValue, bool aNotify) { + return SetAttr(aNameSpaceID, aName, aPrefix, aValue, nullptr, aNotify); + } + nsresult SetAttr(int32_t aNameSpaceID, nsAtom* aName, const nsAString& aValue, + nsIPrincipal* aTriggeringPrincipal, bool aNotify) { + return SetAttr(aNameSpaceID, aName, nullptr, aValue, aTriggeringPrincipal, + aNotify); + } + + /** + * Set attribute values. All attribute values are assumed to have a + * canonical String representation that can be used for these + * methods. The SetAttr method is assumed to perform a translation + * of the canonical form into the underlying content specific + * form. + * + * @param aNameSpaceID the namespace of the attribute + * @param aName the name of the attribute + * @param aPrefix the prefix of the attribute + * @param aValue the value to set + * @param aMaybeScriptedPrincipal the principal of the scripted caller + * responsible for setting the attribute, or null if no scripted caller can be + * determined. A null value here does not guarantee that there is no + * scripted caller, but a non-null value does guarantee that a scripted + * caller with the given principal is directly responsible for the + * attribute change. + * @param aNotify specifies how whether or not the document should be + * notified of the attribute change. + */ + nsresult SetAttr(int32_t aNameSpaceID, nsAtom* aName, nsAtom* aPrefix, + const nsAString& aValue, + nsIPrincipal* aMaybeScriptedPrincipal, bool aNotify); + + /** + * Remove an attribute so that it is no longer explicitly specified. + * + * @param aNameSpaceID the namespace id of the attribute + * @param aAttr the name of the attribute to unset + * @param aNotify specifies whether or not the document should be + * notified of the attribute change + */ + nsresult UnsetAttr(int32_t aNameSpaceID, nsAtom* aAttribute, bool aNotify); + + /** + * Get the namespace / name / prefix of a given attribute. + * + * @param aIndex the index of the attribute name + * @returns The name at the given index, or null if the index is + * out-of-bounds. + * @note The document returned by NodeInfo()->GetDocument() (if one is + * present) is *not* necessarily the owner document of the element. + * @note The pointer returned by this function is only valid until the + * next call of either GetAttrNameAt or SetAttr on the element. + */ + const nsAttrName* GetAttrNameAt(uint32_t aIndex) const { + return mAttrs.GetSafeAttrNameAt(aIndex); + } + + /** + * Same as above, but does not do out-of-bounds checks! + */ + const nsAttrName* GetUnsafeAttrNameAt(uint32_t aIndex) const { + return mAttrs.AttrNameAt(aIndex); + } + + /** + * Gets the attribute info (name and value) for this element at a given index. + */ + BorrowedAttrInfo GetAttrInfoAt(uint32_t aIndex) const { + if (aIndex >= mAttrs.AttrCount()) { + return BorrowedAttrInfo(nullptr, nullptr); + } + + return mAttrs.AttrInfoAt(aIndex); + } + + /** + * Get the number of all specified attributes. + * + * @return the number of attributes + */ + uint32_t GetAttrCount() const { return mAttrs.AttrCount(); } + + virtual bool IsNodeOfType(uint32_t aFlags) const override; + + /** + * Get the class list of this element (this corresponds to the value of the + * class attribute). This may be null if there are no classes, but that's not + * guaranteed (e.g. we could have class=""). + */ + const nsAttrValue* GetClasses() const { + if (!MayHaveClass()) { + return nullptr; + } + + if (IsSVGElement()) { + if (const nsAttrValue* value = GetSVGAnimatedClass()) { + return value; + } + } + + return GetParsedAttr(nsGkAtoms::_class); + } + +#ifdef MOZ_DOM_LIST + virtual void List(FILE* out = stdout, int32_t aIndent = 0) const override { + List(out, aIndent, ""_ns); + } + virtual void DumpContent(FILE* out, int32_t aIndent, + bool aDumpAll) const override; + void List(FILE* out, int32_t aIndent, const nsCString& aPrefix) const; + void ListAttributes(FILE* out) const; +#endif + + /** + * Append to aOutDescription a string describing the element and its + * attributes. + * If aShort is true, only the id and class attributes will be listed. + */ + void Describe(nsAString& aOutDescription, bool aShort = false) const; + + /* + * Attribute Mapping Helpers + */ + struct MappedAttributeEntry { + const nsStaticAtom* const attribute; + }; + + /** + * A common method where you can just pass in a list of maps to check + * for attribute dependence. Most implementations of + * IsAttributeMapped should use this function as a default + * handler. + */ + template <size_t N> + static bool FindAttributeDependence( + const nsAtom* aAttribute, const MappedAttributeEntry* const (&aMaps)[N]) { + return FindAttributeDependence(aAttribute, aMaps, N); + } + + static nsStaticAtom* const* HTMLSVGPropertiesToTraverseAndUnlink(); + + private: + void DescribeAttribute(uint32_t index, nsAString& aOutDescription) const; + + static bool FindAttributeDependence(const nsAtom* aAttribute, + const MappedAttributeEntry* const aMaps[], + uint32_t aMapCount); + + protected: + inline bool GetAttr(int32_t aNameSpaceID, const nsAtom* aName, + DOMString& aResult) const { + NS_ASSERTION(nullptr != aName, "must have attribute name"); + NS_ASSERTION(aNameSpaceID != kNameSpaceID_Unknown, + "must have a real namespace ID!"); + MOZ_ASSERT(aResult.IsEmpty(), "Should have empty string coming in"); + const nsAttrValue* val = mAttrs.GetAttr(aName, aNameSpaceID); + if (val) { + val->ToString(aResult); + return true; + } + // else DOMString comes pre-emptied. + return false; + } + + public: + bool HasAttrs() const { return mAttrs.HasAttrs(); } + + inline bool GetAttr(const nsAString& aName, DOMString& aResult) const { + MOZ_ASSERT(aResult.IsEmpty(), "Should have empty string coming in"); + const nsAttrValue* val = mAttrs.GetAttr(aName); + if (val) { + val->ToString(aResult); + return true; + } + // else DOMString comes pre-emptied. + return false; + } + + void GetTagName(nsAString& aTagName) const { aTagName = NodeName(); } + void GetId(nsAString& aId) const { + GetAttr(kNameSpaceID_None, nsGkAtoms::id, aId); + } + void GetId(DOMString& aId) const { + GetAttr(kNameSpaceID_None, nsGkAtoms::id, aId); + } + void SetId(const nsAString& aId) { + SetAttr(kNameSpaceID_None, nsGkAtoms::id, aId, true); + } + void GetClassName(nsAString& aClassName) { + GetAttr(kNameSpaceID_None, nsGkAtoms::_class, aClassName); + } + void GetClassName(DOMString& aClassName) { + GetAttr(kNameSpaceID_None, nsGkAtoms::_class, aClassName); + } + void SetClassName(const nsAString& aClassName) { + SetAttr(kNameSpaceID_None, nsGkAtoms::_class, aClassName, true); + } + + nsDOMTokenList* ClassList(); + nsDOMTokenList* Part(); + + nsDOMAttributeMap* Attributes(); + + void GetAttributeNames(nsTArray<nsString>& aResult); + + void GetAttribute(const nsAString& aName, nsAString& aReturn) { + DOMString str; + GetAttribute(aName, str); + str.ToString(aReturn); + } + + void GetAttribute(const nsAString& aName, DOMString& aReturn); + void GetAttributeNS(const nsAString& aNamespaceURI, + const nsAString& aLocalName, nsAString& aReturn); + bool ToggleAttribute(const nsAString& aName, const Optional<bool>& aForce, + nsIPrincipal* aTriggeringPrincipal, ErrorResult& aError); + void SetAttribute(const nsAString& aName, const nsAString& aValue, + nsIPrincipal* aTriggeringPrincipal, ErrorResult& aError); + void SetAttributeNS(const nsAString& aNamespaceURI, + const nsAString& aLocalName, const nsAString& aValue, + nsIPrincipal* aTriggeringPrincipal, ErrorResult& aError); + void SetAttribute(const nsAString& aName, const nsAString& aValue, + ErrorResult& aError) { + SetAttribute(aName, aValue, nullptr, aError); + } + /** + * This method creates a principal that subsumes this element's NodePrincipal + * and which has flags set for elevated permissions that devtools needs to + * operate on this element. The principal returned by this method is used by + * various devtools methods to permit otherwise blocked operations, without + * changing any other restrictions the NodePrincipal might have. + */ + already_AddRefed<nsIPrincipal> CreateDevtoolsPrincipal(); + void SetAttributeDevtools(const nsAString& aName, const nsAString& aValue, + ErrorResult& aError); + void SetAttributeDevtoolsNS(const nsAString& aNamespaceURI, + const nsAString& aLocalName, + const nsAString& aValue, ErrorResult& aError); + + void RemoveAttribute(const nsAString& aName, ErrorResult& aError); + void RemoveAttributeNS(const nsAString& aNamespaceURI, + const nsAString& aLocalName, ErrorResult& aError); + bool HasAttribute(const nsAString& aName) const { + return InternalGetAttrNameFromQName(aName) != nullptr; + } + bool HasAttributeNS(const nsAString& aNamespaceURI, + const nsAString& aLocalName) const; + bool HasAttributes() const { return HasAttrs(); } + Element* Closest(const nsACString& aSelector, ErrorResult& aResult); + bool Matches(const nsACString& aSelector, ErrorResult& aError); + already_AddRefed<nsIHTMLCollection> GetElementsByTagName( + const nsAString& aQualifiedName); + already_AddRefed<nsIHTMLCollection> GetElementsByTagNameNS( + const nsAString& aNamespaceURI, const nsAString& aLocalName, + ErrorResult& aError); + already_AddRefed<nsIHTMLCollection> GetElementsByClassName( + const nsAString& aClassNames); + + PseudoStyleType GetPseudoElementType() const { + nsresult rv = NS_OK; + auto raw = GetProperty(nsGkAtoms::pseudoProperty, &rv); + if (rv == NS_PROPTABLE_PROP_NOT_THERE) { + return PseudoStyleType::NotPseudo; + } + return PseudoStyleType(reinterpret_cast<uintptr_t>(raw)); + } + + void SetPseudoElementType(PseudoStyleType aPseudo) { + static_assert(sizeof(PseudoStyleType) <= sizeof(uintptr_t), + "Need to be able to store this in a void*"); + MOZ_ASSERT(PseudoStyle::IsPseudoElement(aPseudo)); + SetProperty(nsGkAtoms::pseudoProperty, reinterpret_cast<void*>(aPseudo)); + } + + /** + * Return an array of all elements in the subtree rooted at this + * element that have grid container frames. This does not include + * pseudo-elements. + */ + void GetElementsWithGrid(nsTArray<RefPtr<Element>>& aElements); + + /** + * Provide a direct way to determine if this Element has visible + * scrollbars. Flushes layout. + */ + MOZ_CAN_RUN_SCRIPT bool HasVisibleScrollbars(); + + private: + /** + * Implement the algorithm specified at + * https://dom.spec.whatwg.org/#insert-adjacent for both + * |insertAdjacentElement()| and |insertAdjacentText()| APIs. + */ + nsINode* InsertAdjacent(const nsAString& aWhere, nsINode* aNode, + ErrorResult& aError); + + public: + Element* InsertAdjacentElement(const nsAString& aWhere, Element& aElement, + ErrorResult& aError); + + void InsertAdjacentText(const nsAString& aWhere, const nsAString& aData, + ErrorResult& aError); + + void SetPointerCapture(int32_t aPointerId, ErrorResult& aError); + void ReleasePointerCapture(int32_t aPointerId, ErrorResult& aError); + bool HasPointerCapture(long aPointerId); + void SetCapture(bool aRetargetToElement); + + void SetCaptureAlways(bool aRetargetToElement); + + void ReleaseCapture(); + + already_AddRefed<Promise> RequestFullscreen(CallerType, ErrorResult&); + void RequestPointerLock(CallerType aCallerType); + Attr* GetAttributeNode(const nsAString& aName); + already_AddRefed<Attr> SetAttributeNode(Attr& aNewAttr, ErrorResult& aError); + already_AddRefed<Attr> RemoveAttributeNode(Attr& aOldAttr, + ErrorResult& aError); + Attr* GetAttributeNodeNS(const nsAString& aNamespaceURI, + const nsAString& aLocalName); + already_AddRefed<Attr> SetAttributeNodeNS(Attr& aNewAttr, + ErrorResult& aError); + + MOZ_CAN_RUN_SCRIPT already_AddRefed<DOMRectList> GetClientRects(); + MOZ_CAN_RUN_SCRIPT already_AddRefed<DOMRect> GetBoundingClientRect(); + + // Shadow DOM v1 + already_AddRefed<ShadowRoot> AttachShadow(const ShadowRootInit& aInit, + ErrorResult& aError); + bool CanAttachShadowDOM() const; + + enum class DelegatesFocus : bool { No, Yes }; + + already_AddRefed<ShadowRoot> AttachShadowWithoutNameChecks( + ShadowRootMode aMode, DelegatesFocus = DelegatesFocus::No, + SlotAssignmentMode aSlotAssignmentMode = SlotAssignmentMode::Named); + + // Attach UA Shadow Root if it is not attached. + enum class NotifyUAWidgetSetup : bool { No, Yes }; + void AttachAndSetUAShadowRoot(NotifyUAWidgetSetup = NotifyUAWidgetSetup::Yes, + DelegatesFocus = DelegatesFocus::No); + + // Dispatch an event to UAWidgetsChild, triggering construction + // or onchange callback on the existing widget. + void NotifyUAWidgetSetupOrChange(); + + enum class UnattachShadowRoot { + No, + Yes, + }; + + // Dispatch an event to UAWidgetsChild, triggering UA Widget destruction. + // and optionally remove the shadow root. + void NotifyUAWidgetTeardown(UnattachShadowRoot = UnattachShadowRoot::Yes); + + void UnattachShadow(); + + ShadowRoot* GetShadowRootByMode() const; + void SetSlot(const nsAString& aName, ErrorResult& aError); + void GetSlot(nsAString& aName); + + ShadowRoot* GetShadowRoot() const { + const nsExtendedDOMSlots* slots = GetExistingExtendedDOMSlots(); + return slots ? slots->mShadowRoot.get() : nullptr; + } + + const Maybe<float> GetLastRememberedBSize() const { + const nsExtendedDOMSlots* slots = GetExistingExtendedDOMSlots(); + return slots ? slots->mLastRememberedBSize : Nothing(); + } + const Maybe<float> GetLastRememberedISize() const { + const nsExtendedDOMSlots* slots = GetExistingExtendedDOMSlots(); + return slots ? slots->mLastRememberedISize : Nothing(); + } + bool HasLastRememberedBSize() const { + return GetLastRememberedBSize().isSome(); + } + bool HasLastRememberedISize() const { + return GetLastRememberedISize().isSome(); + } + + const Maybe<ContentRelevancy> GetContentRelevancy() const { + const auto* slots = GetExistingExtendedDOMSlots(); + return slots ? slots->mContentRelevancy : Nothing(); + } + void SetContentRelevancy(ContentRelevancy relevancy) { + ExtendedDOMSlots()->mContentRelevancy = Some(relevancy); + } + + const Maybe<bool> GetVisibleForContentVisibility() const { + const auto* slots = GetExistingExtendedDOMSlots(); + return slots ? slots->mVisibleForContentVisibility : Nothing(); + } + void SetVisibleForContentVisibility(bool visible) { + ExtendedDOMSlots()->mVisibleForContentVisibility = Some(visible); + } + + void ClearContentRelevancy() { + if (auto* slots = GetExistingExtendedDOMSlots()) { + slots->mContentRelevancy.reset(); + slots->mVisibleForContentVisibility.reset(); + } + } + + // https://drafts.csswg.org/cssom-view-1/#dom-element-checkvisibility + MOZ_CAN_RUN_SCRIPT bool CheckVisibility(const CheckVisibilityOptions&); + + private: + // DO NOT USE THIS FUNCTION directly in C++. This function is supposed to be + // called from JS. Use PresShell::ScrollContentIntoView instead. + MOZ_CAN_RUN_SCRIPT void ScrollIntoView(const ScrollIntoViewOptions& aOptions); + + public: + MOZ_CAN_RUN_SCRIPT + // DO NOT USE THIS FUNCTION directly in C++. This function is supposed to be + // called from JS. Use PresShell::ScrollContentIntoView instead. + void ScrollIntoView(const BooleanOrScrollIntoViewOptions& aObject); + MOZ_CAN_RUN_SCRIPT void Scroll(double aXScroll, double aYScroll); + MOZ_CAN_RUN_SCRIPT void Scroll(const ScrollToOptions& aOptions); + MOZ_CAN_RUN_SCRIPT void ScrollTo(double aXScroll, double aYScroll); + MOZ_CAN_RUN_SCRIPT void ScrollTo(const ScrollToOptions& aOptions); + MOZ_CAN_RUN_SCRIPT void ScrollBy(double aXScrollDif, double aYScrollDif); + MOZ_CAN_RUN_SCRIPT void ScrollBy(const ScrollToOptions& aOptions); + MOZ_CAN_RUN_SCRIPT int32_t ScrollTop(); + MOZ_CAN_RUN_SCRIPT void SetScrollTop(int32_t aScrollTop); + MOZ_CAN_RUN_SCRIPT int32_t ScrollLeft(); + MOZ_CAN_RUN_SCRIPT void SetScrollLeft(int32_t aScrollLeft); + MOZ_CAN_RUN_SCRIPT int32_t ScrollWidth(); + MOZ_CAN_RUN_SCRIPT int32_t ScrollHeight(); + MOZ_CAN_RUN_SCRIPT void MozScrollSnap(); + MOZ_CAN_RUN_SCRIPT int32_t ClientTop() { + return CSSPixel::FromAppUnits(GetClientAreaRect().y).Rounded(); + } + MOZ_CAN_RUN_SCRIPT int32_t ClientLeft() { + return CSSPixel::FromAppUnits(GetClientAreaRect().x).Rounded(); + } + MOZ_CAN_RUN_SCRIPT int32_t ClientWidth() { + return CSSPixel::FromAppUnits(GetClientAreaRect().Width()).Rounded(); + } + MOZ_CAN_RUN_SCRIPT int32_t ClientHeight() { + return CSSPixel::FromAppUnits(GetClientAreaRect().Height()).Rounded(); + } + + MOZ_CAN_RUN_SCRIPT int32_t ScreenX(); + MOZ_CAN_RUN_SCRIPT int32_t ScreenY(); + MOZ_CAN_RUN_SCRIPT already_AddRefed<nsIScreen> GetScreen(); + + MOZ_CAN_RUN_SCRIPT int32_t ScrollTopMin(); + MOZ_CAN_RUN_SCRIPT int32_t ScrollTopMax(); + MOZ_CAN_RUN_SCRIPT int32_t ScrollLeftMin(); + MOZ_CAN_RUN_SCRIPT int32_t ScrollLeftMax(); + + MOZ_CAN_RUN_SCRIPT double ClientHeightDouble() { + return CSSPixel::FromAppUnits(GetClientAreaRect().Height()); + } + + MOZ_CAN_RUN_SCRIPT double ClientWidthDouble() { + return CSSPixel::FromAppUnits(GetClientAreaRect().Width()); + } + + // This function will return the block size of first line box, no matter if + // the box is 'block' or 'inline'. The return unit is pixel. If the element + // can't get a primary frame, we will return be zero. + double FirstLineBoxBSize() const; + + already_AddRefed<Flex> GetAsFlexContainer(); + void GetGridFragments(nsTArray<RefPtr<Grid>>& aResult); + + bool HasGridFragments(); + + already_AddRefed<DOMMatrixReadOnly> GetTransformToAncestor( + Element& aAncestor); + already_AddRefed<DOMMatrixReadOnly> GetTransformToParent(); + already_AddRefed<DOMMatrixReadOnly> GetTransformToViewport(); + + already_AddRefed<Animation> Animate( + JSContext* aContext, JS::Handle<JSObject*> aKeyframes, + const UnrestrictedDoubleOrKeyframeAnimationOptions& aOptions, + ErrorResult& aError); + + MOZ_CAN_RUN_SCRIPT + void GetAnimations(const GetAnimationsOptions& aOptions, + nsTArray<RefPtr<Animation>>& aAnimations); + + void GetAnimationsWithoutFlush(const GetAnimationsOptions& aOptions, + nsTArray<RefPtr<Animation>>& aAnimations); + + static void GetAnimationsUnsorted(Element* aElement, + PseudoStyleType aPseudoType, + nsTArray<RefPtr<Animation>>& aAnimations); + + void CloneAnimationsFrom(const Element& aOther); + + virtual void GetInnerHTML(nsAString& aInnerHTML, OOMReporter& aError); + virtual void SetInnerHTML(const nsAString& aInnerHTML, + nsIPrincipal* aSubjectPrincipal, + ErrorResult& aError); + void GetOuterHTML(nsAString& aOuterHTML); + void SetOuterHTML(const nsAString& aOuterHTML, ErrorResult& aError); + void InsertAdjacentHTML(const nsAString& aPosition, const nsAString& aText, + ErrorResult& aError); + + void SetHTML(const nsAString& aInnerHTML, const SetHTMLOptions& aOptions, + ErrorResult& aError); + + //---------------------------------------- + + /** + * Add a script event listener with the given event handler name + * (like onclick) and with the value as JS + * @param aEventName the event listener name + * @param aValue the JS to attach + * @param aDefer indicates if deferred execution is allowed + */ + void SetEventHandler(nsAtom* aEventName, const nsAString& aValue, + bool aDefer = true); + + /** + * Do whatever needs to be done when the mouse leaves a link + */ + nsresult LeaveLink(nsPresContext* aPresContext); + + static bool ShouldBlur(nsIContent* aContent); + + /** + * Method to create and dispatch a left-click event loosely based on + * aSourceEvent. If aFullDispatch is true, the event will be dispatched + * through the full dispatching of the presshell of the aPresContext; if it's + * false the event will be dispatched only as a DOM event. + * If aPresContext is nullptr, this does nothing. + * + * @param aFlags Extra flags for the dispatching event. The true flags + * will be respected. + */ + MOZ_CAN_RUN_SCRIPT + static nsresult DispatchClickEvent(nsPresContext* aPresContext, + WidgetInputEvent* aSourceEvent, + nsIContent* aTarget, bool aFullDispatch, + const EventFlags* aFlags, + nsEventStatus* aStatus); + + /** + * Method to dispatch aEvent to aTarget. If aFullDispatch is true, the event + * will be dispatched through the full dispatching of the presshell of the + * aPresContext; if it's false the event will be dispatched only as a DOM + * event. + * If aPresContext is nullptr, this does nothing. + */ + using nsIContent::DispatchEvent; + MOZ_CAN_RUN_SCRIPT + static nsresult DispatchEvent(nsPresContext* aPresContext, + WidgetEvent* aEvent, nsIContent* aTarget, + bool aFullDispatch, nsEventStatus* aStatus); + + bool IsDisplayContents() const { + return HasServoData() && Servo_Element_IsDisplayContents(this); + } + + /* + * https://html.spec.whatwg.org/#being-rendered + * + * With a gotcha for display contents: + * https://github.com/whatwg/html/issues/1837 + */ + bool IsRendered() const { return GetPrimaryFrame() || IsDisplayContents(); } + + const nsAttrValue* GetParsedAttr(const nsAtom* aAttr) const { + return mAttrs.GetAttr(aAttr); + } + + const nsAttrValue* GetParsedAttr(const nsAtom* aAttr, + int32_t aNameSpaceID) const { + return mAttrs.GetAttr(aAttr, aNameSpaceID); + } + + /** + * Returns the attribute map, if there is one. + * + * @return existing attribute map or nullptr. + */ + nsDOMAttributeMap* GetAttributeMap() { + nsDOMSlots* slots = GetExistingDOMSlots(); + + return slots ? slots->mAttributeMap.get() : nullptr; + } + + void RecompileScriptEventListeners(); + + /** + * Get the attr info for the given namespace ID and attribute name. The + * namespace ID must not be kNameSpaceID_Unknown and the name must not be + * null. Note that this can only return info on attributes that actually + * live on this element (and is only virtual to handle XUL prototypes). That + * is, this should only be called from methods that only care about attrs + * that effectively live in mAttrs. + */ + BorrowedAttrInfo GetAttrInfo(int32_t aNamespaceID, + const nsAtom* aName) const { + NS_ASSERTION(aName, "must have attribute name"); + NS_ASSERTION(aNamespaceID != kNameSpaceID_Unknown, + "must have a real namespace ID!"); + + int32_t index = mAttrs.IndexOfAttr(aName, aNamespaceID); + if (index < 0) { + return BorrowedAttrInfo(nullptr, nullptr); + } + + return mAttrs.AttrInfoAt(index); + } + + /** + * Parse a string into an nsAttrValue for a CORS attribute. This + * never fails. The resulting value is an enumerated value whose + * GetEnumValue() returns one of the above constants. + */ + static void ParseCORSValue(const nsAString& aValue, nsAttrValue& aResult); + + /** + * Return the CORS mode for a given string + */ + static CORSMode StringToCORSMode(const nsAString& aValue); + + /** + * Return the CORS mode for a given nsAttrValue (which may be null, + * but if not should have been parsed via ParseCORSValue). + */ + static CORSMode AttrValueToCORSMode(const nsAttrValue* aValue); + + nsINode* GetScopeChainParent() const override; + + /** + * Locate a TextEditor rooted at this content node, if there is one. + */ + MOZ_CAN_RUN_SCRIPT_BOUNDARY mozilla::TextEditor* GetTextEditorInternal(); + + /** + * Gets value of boolean attribute. Only works for attributes in null + * namespace. + * + * @param aAttr name of attribute. + * @param aValue Boolean value of attribute. + */ + bool GetBoolAttr(nsAtom* aAttr) const { + return HasAttr(kNameSpaceID_None, aAttr); + } + + /** + * Sets value of boolean attribute by removing attribute or setting it to + * the empty string. Only works for attributes in null namespace. + * + * @param aAttr name of attribute. + * @param aValue Boolean value of attribute. + */ + nsresult SetBoolAttr(nsAtom* aAttr, bool aValue); + + /** + * Gets the enum value string of an attribute and using a default value if + * the attribute is missing or the string is an invalid enum value. + * + * @param aType the name of the attribute. + * @param aDefault the default value if the attribute is missing or invalid. + * @param aResult string corresponding to the value [out]. + */ + void GetEnumAttr(nsAtom* aAttr, const char* aDefault, + nsAString& aResult) const; + + /** + * Gets the enum value string of an attribute and using the default missing + * value if the attribute is missing or the default invalid value if the + * string is an invalid enum value. + * + * @param aType the name of the attribute. + * @param aDefaultMissing the default value if the attribute is missing. If + null and the attribute is missing, aResult will be + set to the null DOMString; this only matters for + cases in which we're reflecting a nullable string. + * @param aDefaultInvalid the default value if the attribute is invalid. + * @param aResult string corresponding to the value [out]. + */ + void GetEnumAttr(nsAtom* aAttr, const char* aDefaultMissing, + const char* aDefaultInvalid, nsAString& aResult) const; + + /** + * Unset an attribute. + */ + void UnsetAttr(nsAtom* aAttr, ErrorResult& aError) { + aError = UnsetAttr(kNameSpaceID_None, aAttr, true); + } + + /** + * Set an attribute in the simplest way possible. + */ + void SetAttr(nsAtom* aAttr, const nsAString& aValue, ErrorResult& aError) { + aError = SetAttr(kNameSpaceID_None, aAttr, aValue, true); + } + + void SetAttr(nsAtom* aAttr, const nsAString& aValue, + nsIPrincipal* aTriggeringPrincipal, ErrorResult& aError) { + aError = + SetAttr(kNameSpaceID_None, aAttr, aValue, aTriggeringPrincipal, true); + } + + /** + * Set a content attribute via a reflecting nullable string IDL + * attribute (e.g. a CORS attribute). If DOMStringIsNull(aValue), + * this will actually remove the content attribute. + */ + void SetOrRemoveNullableStringAttr(nsAtom* aName, const nsAString& aValue, + ErrorResult& aError); + + /** + * Retrieve the ratio of font-size-inflated text font size to computed font + * size for this element. This will query the element for its primary frame, + * and then use this to get font size inflation information about the frame. + * + * @returns The font size inflation ratio (inflated font size to uninflated + * font size) for the primary frame of this element. Returns 1.0 + * by default if font size inflation is not enabled. Returns -1 + * if the element does not have a primary frame. + * + * @note The font size inflation ratio that is returned is actually the + * font size inflation data for the element's _primary frame_, not the + * element itself, but for most purposes, this should be sufficient. + */ + float FontSizeInflation(); + + void GetImplementedPseudoElement(nsAString&) const; + + ReferrerPolicy GetReferrerPolicyAsEnum() const; + ReferrerPolicy ReferrerPolicyFromAttr(const nsAttrValue* aValue) const; + + /* + * Helpers for .dataset. This is implemented on Element, though only some + * sorts of elements expose it to JS as a .dataset property + */ + // Getter, to be called from bindings. + already_AddRefed<nsDOMStringMap> Dataset(); + // Callback for destructor of dataset to ensure to null out our weak pointer + // to it. + void ClearDataset(); + + void RegisterIntersectionObserver(DOMIntersectionObserver* aObserver); + void UnregisterIntersectionObserver(DOMIntersectionObserver* aObserver); + void UnlinkIntersectionObservers(); + bool UpdateIntersectionObservation(DOMIntersectionObserver* aObserver, + int32_t threshold); + + // A number of methods to cast to various XUL interfaces. They return a + // pointer only if the element implements that interface. + already_AddRefed<nsIDOMXULButtonElement> AsXULButton(); + already_AddRefed<nsIDOMXULContainerElement> AsXULContainer(); + already_AddRefed<nsIDOMXULContainerItemElement> AsXULContainerItem(); + already_AddRefed<nsIDOMXULControlElement> AsXULControl(); + already_AddRefed<nsIDOMXULMenuListElement> AsXULMenuList(); + already_AddRefed<nsIDOMXULMultiSelectControlElement> + AsXULMultiSelectControl(); + already_AddRefed<nsIDOMXULRadioGroupElement> AsXULRadioGroup(); + already_AddRefed<nsIDOMXULRelatedElement> AsXULRelated(); + already_AddRefed<nsIDOMXULSelectControlElement> AsXULSelectControl(); + already_AddRefed<nsIDOMXULSelectControlItemElement> AsXULSelectControlItem(); + already_AddRefed<nsIBrowser> AsBrowser(); + already_AddRefed<nsIAutoCompletePopup> AsAutoCompletePopup(); + + /** + * Get the presentation context for this content node. + * @return the presentation context + */ + enum PresContextFor { eForComposedDoc, eForUncomposedDoc }; + nsPresContext* GetPresContext(PresContextFor aFor); + + /** + * The method focuses (or activates) element that accesskey is bound to. It is + * called when accesskey is activated. + * + * @param aKeyCausesActivation - if true then element should be activated + * @param aIsTrustedEvent - if true then event that is cause of accesskey + * execution is trusted. + * @return an error if the element isn't able to handle the accesskey (caller + * would look for the next element to handle it). + * a boolean indicates whether the focus moves to the element after + * the element handles the accesskey. + */ + MOZ_CAN_RUN_SCRIPT + virtual Result<bool, nsresult> PerformAccesskey(bool aKeyCausesActivation, + bool aIsTrustedEvent) { + return Err(NS_ERROR_NOT_IMPLEMENTED); + } + + protected: + /* + * Named-bools for use with SetAttrAndNotify to make call sites easier to + * read. + */ + static const bool kFireMutationEvent = true; + static const bool kDontFireMutationEvent = false; + static const bool kNotifyDocumentObservers = true; + static const bool kDontNotifyDocumentObservers = false; + static const bool kCallAfterSetAttr = true; + static const bool kDontCallAfterSetAttr = false; + + /** + * Set attribute and (if needed) notify documentobservers and fire off + * mutation events. This will send the AttributeChanged notification. + * Callers of this method are responsible for calling AttributeWillChange, + * since that needs to happen before the new attr value has been set, and + * in particular before it has been parsed. + * + * For the boolean parameters, consider using the named bools above to aid + * code readability. + * + * @param aNamespaceID namespace of attribute + * @param aAttribute local-name of attribute + * @param aPrefix aPrefix of attribute + * @param aOldValue The old value of the attribute to use as a fallback + * in the cases where the actual old value (i.e. + * its current value) is !StoresOwnData() --- in which + * case the current value is probably already useless. + * If the current value is StoresOwnData() (or absent), + * aOldValue will not be used. aOldValue will only be set + * in certain circumstances (there are mutation + * listeners, element is a custom element, attribute was + * not previously unset). Otherwise it will be null. + * @param aParsedValue parsed new value of attribute. Replaced by the + * old value of the attribute. This old value is only + * useful if either it or the new value is StoresOwnData. + * @param aMaybeScriptedPrincipal + * the principal of the scripted caller responsible for + * setting the attribute, or null if no scripted caller + * can be determined. A null value here does not + * guarantee that there is no scripted caller, but a + * non-null value does guarantee that a scripted caller + * with the given principal is directly responsible for + * the attribute change. + * @param aModType MutationEvent_Binding::MODIFICATION or ADDITION. Only + * needed if aFireMutation or aNotify is true. + * @param aFireMutation should mutation-events be fired? + * @param aNotify should we notify document-observers? + * @param aCallAfterSetAttr should we call AfterSetAttr? + * @param aComposedDocument The current composed document of the element. + */ + nsresult SetAttrAndNotify(int32_t aNamespaceID, nsAtom* aName, + nsAtom* aPrefix, const nsAttrValue* aOldValue, + nsAttrValue& aParsedValue, + nsIPrincipal* aMaybeScriptedPrincipal, + uint8_t aModType, bool aFireMutation, bool aNotify, + bool aCallAfterSetAttr, Document* aComposedDocument, + const mozAutoDocUpdate& aGuard); + + /** + * Scroll to a new position using behavior evaluated from CSS and + * a CSSOM-View DOM method ScrollOptions dictionary. The scrolling may + * be performed asynchronously or synchronously depending on the resolved + * scroll-behavior. + * + * @param aScroll Destination of scroll, in CSS pixels + * @param aOptions Dictionary of options to be evaluated + */ + MOZ_CAN_RUN_SCRIPT + void Scroll(const CSSIntPoint& aScroll, const ScrollOptions& aOptions); + + /** + * Convert an attribute string value to attribute type based on the type of + * attribute. Called by SetAttr(). Note that at the moment we only do this + * for attributes in the null namespace (kNameSpaceID_None). + * + * @param aNamespaceID the namespace of the attribute to convert + * @param aAttribute the attribute to convert + * @param aValue the string value to convert + * @param aMaybeScriptedPrincipal the principal of the script setting the + * attribute, if one can be determined, or null otherwise. As in + * AfterSetAttr, a null value does not guarantee that the attribute was + * not set by a scripted caller, but a non-null value guarantees that + * the attribute was set by a scripted caller with the given principal. + * @param aResult the nsAttrValue [OUT] + * @return true if the parsing was successful, false otherwise + */ + virtual bool ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute, + const nsAString& aValue, + nsIPrincipal* aMaybeScriptedPrincipal, + nsAttrValue& aResult); + + /** + * Try to set the attribute as a mapped attribute, if applicable. This will + * only be called for attributes that are in the null namespace and only on + * attributes that returned true when passed to IsAttributeMapped. The + * caller will not try to set the attr in any other way if this method + * returns true (the value of aRetval does not matter for that purpose). + * + * @param aName the name of the attribute + * @param aValue the nsAttrValue to set. Will be swapped with the existing + * value of the attribute if the attribute already exists. + * @param [out] aValueWasSet If the attribute was not set previously, + * aValue will be swapped with an empty attribute + * and aValueWasSet will be set to false. Otherwise, + * aValueWasSet will be set to true and aValue will + * contain the previous value set. + * @param [out] aRetval the nsresult status of the operation, if any. + * @return true if the setting was attempted, false otherwise. + */ + virtual bool SetAndSwapMappedAttribute(nsAtom* aName, nsAttrValue& aValue, + bool* aValueWasSet, nsresult* aRetval); + + /** + * Hook that is called by Element::SetAttr to allow subclasses to + * deal with attribute sets. This will only be called after we verify that + * we're actually doing an attr set and will be called before + * AttributeWillChange and before ParseAttribute and hence before we've set + * the new value. + * + * @param aNamespaceID the namespace of the attr being set + * @param aName the localname of the attribute being set + * @param aValue the value it's being set to represented as either a string or + * a parsed nsAttrValue. Alternatively, if the attr is being removed it + * will be null. + * @param aNotify Whether we plan to notify document observers. + */ + virtual nsresult BeforeSetAttr(int32_t aNamespaceID, nsAtom* aName, + const nsAttrValueOrString* aValue, + bool aNotify); + + /** + * Hook that is called by Element::SetAttr to allow subclasses to + * deal with attribute sets. This will only be called after we have called + * SetAndSwapAttr (that is, after we have actually set the attr). It will + * always be called under a scriptblocker. + * + * @param aNamespaceID the namespace of the attr being set + * @param aName the localname of the attribute being set + * @param aValue the value it's being set to. If null, the attr is being + * removed. + * @param aOldValue the value that the attribute had previously. If null, + * the attr was not previously set. This argument may not have the + * correct value for SVG elements, or other cases in which the + * attribute value doesn't store its own data + * @param aMaybeScriptedPrincipal the principal of the scripted caller + * responsible for setting the attribute, or null if no scripted caller + * can be determined, or the attribute is being unset. A null value + * here does not guarantee that there is no scripted caller, but a + * non-null value does guarantee that a scripted caller with the given + * principal is directly responsible for the attribute change. + * @param aNotify Whether we plan to notify document observers. + */ + virtual nsresult AfterSetAttr(int32_t aNamespaceID, nsAtom* aName, + const nsAttrValue* aValue, + const nsAttrValue* aOldValue, + nsIPrincipal* aMaybeScriptedPrincipal, + bool aNotify); + + /** + * This function shall be called just before the id attribute changes. It will + * be called after BeforeSetAttr. If the attribute being changed is not the id + * attribute, this function does nothing. Otherwise, it will remove the old id + * from the document's id cache. + * + * This must happen after BeforeSetAttr (rather than during) because the + * the subclasses' calls to BeforeSetAttr may notify on state changes. If they + * incorrectly determine whether the element had an id, the element may not be + * restyled properly. + * + * @param aNamespaceID the namespace of the attr being set + * @param aName the localname of the attribute being set + * @param aValue the new id value. Will be null if the id is being unset. + */ + void PreIdMaybeChange(int32_t aNamespaceID, nsAtom* aName, + const nsAttrValueOrString* aValue); + + /** + * This function shall be called just after the id attribute changes. It will + * be called before AfterSetAttr. If the attribute being changed is not the id + * attribute, this function does nothing. Otherwise, it will add the new id to + * the document's id cache and properly set the ElementHasID flag. + * + * This must happen before AfterSetAttr (rather than during) because the + * the subclasses' calls to AfterSetAttr may notify on state changes. If they + * incorrectly determine whether the element now has an id, the element may + * not be restyled properly. + * + * @param aNamespaceID the namespace of the attr being set + * @param aName the localname of the attribute being set + * @param aValue the new id value. Will be null if the id is being unset. + */ + void PostIdMaybeChange(int32_t aNamespaceID, nsAtom* aName, + const nsAttrValue* aValue); + + /** + * Usually, setting an attribute to the value that it already has results in + * no action. However, in some cases, setting an attribute to its current + * value should have the effect of, for example, forcing a reload of + * network data. To address that, this function will be called in this + * situation to allow the handling of such a case. + * + * @param aNamespaceID the namespace of the attr being set + * @param aName the localname of the attribute being set + * @param aValue the value it's being set to represented as either a string or + * a parsed nsAttrValue. + * @param aNotify Whether we plan to notify document observers. + */ + // Note that this is inlined so that when subclasses call it it gets + // inlined. Those calls don't go through a vtable. + virtual nsresult OnAttrSetButNotChanged(int32_t aNamespaceID, nsAtom* aName, + const nsAttrValueOrString& aValue, + bool aNotify); + + /** + * Hook to allow subclasses to produce a different EventListenerManager if + * needed for attachment of attribute-defined handlers + */ + virtual EventListenerManager* GetEventListenerManagerForAttr( + nsAtom* aAttrName, bool* aDefer); + + /** + * Internal hook for converting an attribute name-string to nsAttrName in + * case there is such existing attribute. aNameToUse can be passed to get + * name which was used for looking for the attribute (lowercase in HTML). + */ + const nsAttrName* InternalGetAttrNameFromQName( + const nsAString& aStr, nsAutoString* aNameToUse = nullptr) const; + + virtual Element* GetNameSpaceElement() override { return this; } + + Attr* GetAttributeNodeNSInternal(const nsAString& aNamespaceURI, + const nsAString& aLocalName); + + inline void RegisterActivityObserver(); + inline void UnregisterActivityObserver(); + + /** + * Add/remove this element to the documents id cache + */ + void AddToIdTable(nsAtom* aId); + void RemoveFromIdTable(); + + /** + * Functions to carry out event default actions for links of all types + * (HTML links, XLinks, SVG "XLinks", etc.) + */ + + /** + * Check that we meet the conditions to handle a link event + * and that we are actually on a link. + * + * @param aVisitor event visitor + * @return true if we can handle the link event, false otherwise + */ + bool CheckHandleEventForLinksPrecondition(EventChainVisitor& aVisitor) const; + + /** + * Handle status bar updates before they can be cancelled. + */ + void GetEventTargetParentForLinks(EventChainPreVisitor& aVisitor); + + void DispatchChromeOnlyLinkClickEvent(EventChainPostVisitor& aVisitor); + + /** + * Handle default actions for link event if the event isn't consumed yet. + */ + MOZ_CAN_RUN_SCRIPT + nsresult PostHandleEventForLinks(EventChainPostVisitor& aVisitor); + + public: + /** + * Check if this element is a link. This matches the CSS definition of the + * :any-link pseudo-class. + */ + bool IsLink() const { + return mState.HasAtLeastOneOfStates(ElementState::VISITED | + ElementState::UNVISITED); + } + + /** + * Get a pointer to the full href URI (fully resolved and canonicalized, since + * it's an nsIURI object) for link elements. + * + * @return A pointer to the URI or null if the element is not a link, or it + * has no HREF attribute, or the HREF attribute is an invalid URI. + */ + virtual already_AddRefed<nsIURI> GetHrefURI() const { return nullptr; } + + /** + * Get the target of this link element. Consumers should established that + * this element is a link (probably using IsLink) before calling this + * function (or else why call it?) + * + * Note: for HTML this gets the value of the 'target' attribute; for XLink + * this gets the value of the xlink:_moz_target attribute, or failing that, + * the value of xlink:show, converted to a suitably equivalent named target + * (e.g. _blank). + */ + virtual void GetLinkTarget(nsAString& aTarget); + + protected: + enum class ReparseAttributes { No, Yes }; + /** + * Copy attributes and state to another element + * @param aDest the object to copy to + */ + nsresult CopyInnerTo(Element* aDest, + ReparseAttributes = ReparseAttributes::Yes); + + /** + * Some event handler content attributes have a different name (e.g. different + * case) from the actual event name. This function takes an event handler + * content attribute name and returns the corresponding event name, to be used + * for adding the actual event listener. + */ + virtual nsAtom* GetEventNameForAttr(nsAtom* aAttr); + + /** + * Register/unregister this element to accesskey map if it supports accesskey. + */ + virtual void RegUnRegAccessKey(bool aDoReg); + + private: +#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED + void AssertInvariantsOnNodeInfoChange(); +#endif + + /** + * Slow path for GetClasses, this should only be called for SVG elements. + */ + const nsAttrValue* GetSVGAnimatedClass() const; + + /** + * Get this element's client area rect in app units. + * @return the frame's client area + */ + MOZ_CAN_RUN_SCRIPT nsRect GetClientAreaRect(); + + /** + * GetCustomInterface is somewhat like a GetInterface, but it is expected + * that the implementation is provided by a custom element or via the + * the XBL implements keyword. To use this, create a public method that + * wraps a call to GetCustomInterface. + */ + template <class T> + void GetCustomInterface(nsGetterAddRefs<T> aResult); + + // Prevent people from doing pointless checks/casts on Element instances. + void IsElement() = delete; + void AsElement() = delete; + + // Data members + ElementState mState; + // Per-node data managed by Servo. + // + // There should not be data on nodes that are not in the flattened tree, or + // descendants of display: none elements. + mozilla::RustCell<ServoNodeData*> mServoData; + + protected: + // Array containing all attributes for this element + AttrArray mAttrs; +}; + +NS_DEFINE_STATIC_IID_ACCESSOR(Element, NS_ELEMENT_IID) + +inline bool Element::HasAttr(int32_t aNameSpaceID, const nsAtom* aName) const { + NS_ASSERTION(nullptr != aName, "must have attribute name"); + NS_ASSERTION(aNameSpaceID != kNameSpaceID_Unknown, + "must have a real namespace ID!"); + + return mAttrs.IndexOfAttr(aName, aNameSpaceID) >= 0; +} + +inline bool Element::HasNonEmptyAttr(int32_t aNameSpaceID, + const nsAtom* aName) const { + MOZ_ASSERT(aNameSpaceID > kNameSpaceID_Unknown, "Must have namespace"); + MOZ_ASSERT(aName, "Must have attribute name"); + + const nsAttrValue* val = mAttrs.GetAttr(aName, aNameSpaceID); + return val && !val->IsEmptyString(); +} + +inline bool Element::AttrValueIs(int32_t aNameSpaceID, const nsAtom* aName, + const nsAString& aValue, + nsCaseTreatment aCaseSensitive) const { + return mAttrs.AttrValueIs(aNameSpaceID, aName, aValue, aCaseSensitive); +} + +inline bool Element::AttrValueIs(int32_t aNameSpaceID, const nsAtom* aName, + const nsAtom* aValue, + nsCaseTreatment aCaseSensitive) const { + return mAttrs.AttrValueIs(aNameSpaceID, aName, aValue, aCaseSensitive); +} + +} // namespace dom +} // namespace mozilla + +inline mozilla::dom::Element* nsINode::AsElement() { + MOZ_ASSERT(IsElement()); + return static_cast<mozilla::dom::Element*>(this); +} + +inline const mozilla::dom::Element* nsINode::AsElement() const { + MOZ_ASSERT(IsElement()); + return static_cast<const mozilla::dom::Element*>(this); +} + +inline mozilla::dom::Element* nsINode::GetParentElement() const { + return mozilla::dom::Element::FromNodeOrNull(mParent); +} + +inline mozilla::dom::Element* nsINode::GetPreviousElementSibling() const { + nsIContent* previousSibling = GetPreviousSibling(); + while (previousSibling) { + if (previousSibling->IsElement()) { + return previousSibling->AsElement(); + } + previousSibling = previousSibling->GetPreviousSibling(); + } + + return nullptr; +} + +inline mozilla::dom::Element* nsINode::GetAsElementOrParentElement() const { + return IsElement() ? const_cast<mozilla::dom::Element*>(AsElement()) + : GetParentElement(); +} + +inline mozilla::dom::Element* nsINode::GetNextElementSibling() const { + nsIContent* nextSibling = GetNextSibling(); + while (nextSibling) { + if (nextSibling->IsElement()) { + return nextSibling->AsElement(); + } + nextSibling = nextSibling->GetNextSibling(); + } + + return nullptr; +} + +/** + * Macros to implement Clone(). _elementName is the class for which to implement + * Clone. + */ +#define NS_IMPL_ELEMENT_CLONE(_elementName) \ + nsresult _elementName::Clone(mozilla::dom::NodeInfo* aNodeInfo, \ + nsINode** aResult) const { \ + *aResult = nullptr; \ + RefPtr<mozilla::dom::NodeInfo> ni(aNodeInfo); \ + auto* nim = ni->NodeInfoManager(); \ + RefPtr<_elementName> it = new (nim) _elementName(ni.forget()); \ + nsresult rv = const_cast<_elementName*>(this)->CopyInnerTo(it); \ + if (NS_SUCCEEDED(rv)) { \ + it.forget(aResult); \ + } \ + \ + return rv; \ + } + +#define EXPAND(...) __VA_ARGS__ +#define NS_IMPL_ELEMENT_CLONE_WITH_INIT_HELPER(_elementName, extra_args_) \ + nsresult _elementName::Clone(mozilla::dom::NodeInfo* aNodeInfo, \ + nsINode** aResult) const { \ + *aResult = nullptr; \ + RefPtr<mozilla::dom::NodeInfo> ni(aNodeInfo); \ + auto* nim = ni->NodeInfoManager(); \ + RefPtr<_elementName> it = \ + new (nim) _elementName(ni.forget() EXPAND extra_args_); \ + nsresult rv = it->Init(); \ + nsresult rv2 = const_cast<_elementName*>(this)->CopyInnerTo(it); \ + if (NS_FAILED(rv2)) { \ + rv = rv2; \ + } \ + if (NS_SUCCEEDED(rv)) { \ + it.forget(aResult); \ + } \ + \ + return rv; \ + } + +#define NS_IMPL_ELEMENT_CLONE_WITH_INIT(_elementName) \ + NS_IMPL_ELEMENT_CLONE_WITH_INIT_HELPER(_elementName, ()) +#define NS_IMPL_ELEMENT_CLONE_WITH_INIT_AND_PARSER(_elementName) \ + NS_IMPL_ELEMENT_CLONE_WITH_INIT_HELPER(_elementName, (, NOT_FROM_PARSER)) + +#endif // mozilla_dom_Element_h__ |