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gecko-dev/dom/base/Element.h
Kirk Steuber 7fdb378650 Bug 1359556 - Optimize cloneNode by preinitializing attribute and child arrays r=bz 
Currently, attribute and child arrays (implemented in dom/base/nsAttrAndChildArray.h) start out empty. When cloning, the array ends up being resized multiple times in order to add the attributes and children that are being cloned from the original node. This would be quicker if the array was initialized to the correct size in the first place so that resizes are not necessary.

However, preallocating space for children is only necessary when performing a deep clone. Therefore, an additional parameter is being added to the Clone, CopyInnerTo, and CloneDocHelper methods to indicate whether preallocation of children should happen. Attributes are copied either way, so that part of the array is preallocated in both cases.

MozReview-Commit-ID: 3iVezeAKXnI

--HG--
extra : rebase_source : 9c3deec6d7aafd6411044d623d4863637b45fd58
2017-04-20 12:57:48 -07:00

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/* -*- 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 nsIDOMElement, implements nsIContent, provides
* utility methods for subclasses, and so forth.
*/
#ifndef mozilla_dom_Element_h__
#define mozilla_dom_Element_h__
#include "mozilla/dom/FragmentOrElement.h" // for base class
#include "nsChangeHint.h" // for enum
#include "mozilla/EventStates.h" // for member
#include "mozilla/ServoTypes.h"
#include "mozilla/dom/DirectionalityUtils.h"
#include "nsIDOMElement.h"
#include "nsILinkHandler.h"
#include "nsINodeList.h"
#include "nsNodeUtils.h"
#include "nsAttrAndChildArray.h"
#include "mozilla/FlushType.h"
#include "nsDOMAttributeMap.h"
#include "nsPresContext.h"
#include "mozilla/CORSMode.h"
#include "mozilla/Attributes.h"
#include "nsIScrollableFrame.h"
#include "mozilla/dom/Attr.h"
#include "nsISMILAttr.h"
#include "mozilla/dom/DOMRect.h"
#include "nsAttrValue.h"
#include "mozilla/EventForwards.h"
#include "mozilla/dom/BindingDeclarations.h"
#include "mozilla/dom/DOMTokenListSupportedTokens.h"
#include "mozilla/dom/WindowBinding.h"
#include "mozilla/dom/ElementBinding.h"
#include "mozilla/dom/Nullable.h"
#include "mozilla/UniquePtr.h"
#include "Units.h"
#include "DOMIntersectionObserver.h"
class mozAutoDocUpdate;
class nsIFrame;
class nsIDOMMozNamedAttrMap;
class nsIMozBrowserFrame;
class nsIURI;
class nsIScrollableFrame;
class nsAttrValueOrString;
class nsContentList;
class nsDOMTokenList;
struct nsRect;
class nsFocusManager;
class nsGlobalWindow;
class nsICSSDeclaration;
class nsISMILAttr;
class nsDocument;
class nsDOMStringMap;
namespace mozilla {
class DeclarationBlock;
namespace dom {
struct AnimationFilter;
struct ScrollIntoViewOptions;
struct ScrollToOptions;
class DOMIntersectionObserver;
class ElementOrCSSPseudoElement;
class UnrestrictedDoubleOrKeyframeAnimationOptions;
enum class CallerType : uint32_t;
} // namespace dom
} // namespace mozilla
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 {
// Set if the element has a pending style change.
ELEMENT_HAS_PENDING_RESTYLE = NODE_SHARED_RESTYLE_BIT_1,
// Set if the element is a potential restyle root (that is, has a style
// change pending _and_ that style change will attempt to restyle
// descendants).
ELEMENT_IS_POTENTIAL_RESTYLE_ROOT = NODE_SHARED_RESTYLE_BIT_2,
// Set if the element has a pending animation-only style change as
// part of an animation-only style update (where we update styles from
// animation to the current refresh tick, but leave everything else as
// it was).
ELEMENT_HAS_PENDING_ANIMATION_ONLY_RESTYLE = ELEMENT_FLAG_BIT(0),
// Set if the element is a potential animation-only restyle root (that
// is, has an animation-only style change pending _and_ that style
// change will attempt to restyle descendants).
ELEMENT_IS_POTENTIAL_ANIMATION_ONLY_RESTYLE_ROOT = ELEMENT_FLAG_BIT(1),
// Set if this element has a pending restyle with an eRestyle_SomeDescendants
// restyle hint.
ELEMENT_IS_CONDITIONAL_RESTYLE_ANCESTOR = ELEMENT_FLAG_BIT(2),
// Just the HAS_PENDING bits, for convenience
ELEMENT_PENDING_RESTYLE_FLAGS =
ELEMENT_HAS_PENDING_RESTYLE |
ELEMENT_HAS_PENDING_ANIMATION_ONLY_RESTYLE,
// Just the IS_POTENTIAL bits, for convenience
ELEMENT_POTENTIAL_RESTYLE_ROOT_FLAGS =
ELEMENT_IS_POTENTIAL_RESTYLE_ROOT |
ELEMENT_IS_POTENTIAL_ANIMATION_ONLY_RESTYLE_ROOT,
// All of the restyle bits together, for convenience.
ELEMENT_ALL_RESTYLE_FLAGS = ELEMENT_PENDING_RESTYLE_FLAGS |
ELEMENT_POTENTIAL_RESTYLE_ROOT_FLAGS |
ELEMENT_IS_CONDITIONAL_RESTYLE_ANCESTOR,
// Set if this element is marked as 'scrollgrab' (see bug 912666)
ELEMENT_HAS_SCROLLGRAB = ELEMENT_FLAG_BIT(3),
// Remaining bits are for subclasses
ELEMENT_TYPE_SPECIFIC_BITS_OFFSET = NODE_TYPE_SPECIFIC_BITS_OFFSET + 4
};
#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 CSSPseudoElementType : uint8_t;
class EventChainPostVisitor;
class EventChainPreVisitor;
class EventChainVisitor;
class EventListenerManager;
class EventStateManager;
namespace dom {
class Animation;
class CustomElementRegistry;
class Link;
class DOMRect;
class DOMRectList;
class DestinationInsertionPointList;
class Grid;
// IID for the dom::Element interface
#define NS_ELEMENT_IID \
{ 0xc67ed254, 0xfd3b, 0x4b10, \
{ 0x96, 0xa2, 0xc5, 0x8b, 0x7b, 0x64, 0x97, 0xd1 } }
class Element : public FragmentOrElement
{
public:
#ifdef MOZILLA_INTERNAL_API
explicit Element(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo) :
FragmentOrElement(aNodeInfo),
mState(NS_EVENT_STATE_MOZ_READONLY)
{
MOZ_ASSERT(mNodeInfo->NodeType() == nsIDOMNode::ELEMENT_NODE,
"Bad NodeType in aNodeInfo");
SetIsElement();
}
~Element()
{
#ifdef MOZ_STYLO
NS_ASSERTION(!HasServoData(), "expected ServoData to be cleared earlier");
#endif
}
#endif // MOZILLA_INTERNAL_API
NS_DECLARE_STATIC_IID_ACCESSOR(NS_ELEMENT_IID)
NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) override;
/**
* Method to get the full state of this element. See mozilla/EventStates.h
* for the possible bits that could be set here.
*/
EventStates 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(EventStates aState);
virtual int32_t TabIndexDefault()
{
return -1;
}
/**
* Get tabIndex of this element. If not found, return TabIndexDefault.
*/
int32_t TabIndex();
/**
* Set tabIndex value to this element.
*/
void SetTabIndex(int32_t aTabIndex, mozilla::ErrorResult& aError);
/**
* Make focus on this element.
*/
virtual void Focus(mozilla::ErrorResult& aError);
/**
* Show blur and clear focus.
*/
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.
*/
EventStates 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.
EventStates mLocks;
// mValues tracks if the locked state should be on or off.
EventStates 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(EventStates aStates, bool aEnabled);
/**
* Remove a style state lock on this element.
*/
void UnlockStyleStates(EventStates aStates);
/**
* Clear all style state locks on this element.
*/
void ClearStyleStateLocks();
/**
* 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() {
mAttrsAndChildren.ClearMappedServoStyle();
}
/**
* Set the inline style declaration for this element. This will send
* an appropriate AttributeChanged notification if aNotify is true.
*/
virtual nsresult SetInlineStyleDeclaration(DeclarationBlock* aDeclaration,
const nsAString* aSerialized,
bool aNotify);
/**
* Get the SMIL override style declaration for this element. If the
* rule hasn't been created, this method simply returns null.
*/
virtual DeclarationBlock* GetSMILOverrideStyleDeclaration();
/**
* Set the SMIL override style declaration for this element. If
* aNotify is true, this method will notify the document's pres
* context, so that the style changes will be noticed.
*/
virtual nsresult SetSMILOverrideStyleDeclaration(
DeclarationBlock* aDeclaration, bool aNotify);
/**
* Returns a new nsISMILAttr that allows the caller to animate the given
* attribute on this element.
*/
virtual UniquePtr<nsISMILAttr> GetAnimatedAttr(int32_t aNamespaceID,
nsIAtom* aName)
{
return nullptr;
}
/**
* 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.
*/
virtual nsICSSDeclaration* GetSMILOverrideStyle();
/**
* 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(bool aIgnoreTabindex) 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 nsIAtom* 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 nsIAtom* 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(DIRECTION_STATES);
}
switch (aDir) {
case (eDir_RTL):
SetFlags(NODE_HAS_DIRECTION_RTL);
if (!aNotify) {
AddStatesSilently(NS_EVENT_STATE_RTL);
}
break;
case(eDir_LTR):
SetFlags(NODE_HAS_DIRECTION_LTR);
if (!aNotify) {
AddStatesSilently(NS_EVENT_STATE_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);
}
}
bool GetBindingURL(nsIDocument* aDocument, css::URLValue **aResult);
// The bdi element defaults to dir=auto if it has no dir attribute set.
// Other elements will only have dir=auto if they have an explicit dir=auto,
// which will mean that HasValidDir() returns true but HasFixedDir() returns
// false
inline bool HasDirAuto() const {
return (!HasFixedDir() &&
(HasValidDir() || IsHTMLElement(nsGkAtoms::bdi)));
}
Directionality GetComputedDirectionality() const;
inline Element* GetFlattenedTreeParentElement() const;
inline Element* GetFlattenedTreeParentElementForStyle() const;
bool HasDirtyDescendantsForServo() const
{
MOZ_ASSERT(IsStyledByServo());
return HasFlag(NODE_HAS_DIRTY_DESCENDANTS_FOR_SERVO);
}
void SetHasDirtyDescendantsForServo() {
MOZ_ASSERT(IsStyledByServo());
SetFlags(NODE_HAS_DIRTY_DESCENDANTS_FOR_SERVO);
}
void UnsetHasDirtyDescendantsForServo() {
MOZ_ASSERT(IsStyledByServo());
UnsetFlags(NODE_HAS_DIRTY_DESCENDANTS_FOR_SERVO);
}
inline void NoteDirtyDescendantsForServo();
#ifdef DEBUG
inline bool DirtyDescendantsBitIsPropagatedForServo();
#endif
bool HasServoData() const {
#ifdef MOZ_STYLO
return !!mServoData.Get();
#else
MOZ_CRASH("Accessing servo node data in non-stylo build");
#endif
}
void ClearServoData();
/**
* 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
{
nsDOMSlots *slots = GetExistingDOMSlots();
if (slots) {
return slots->mCustomElementData;
}
return nullptr;
}
/**
* Sets the custom element data, ownership of the
* callback data is taken by this element.
*
* @param aData The custom element data.
*/
void SetCustomElementData(CustomElementData* aData);
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
* content state, use State(). See mozilla/EventStates.h for
* the possible bits that could be set here.
*/
virtual EventStates 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(EventStates 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(EventStates aStates)
{
mState &= ~aStates;
}
private:
// Need to allow the ESM, nsGlobalWindow, and the focus manager to
// set our state
friend class mozilla::EventStateManager;
friend class ::nsGlobalWindow;
friend class ::nsFocusManager;
// Allow CusomtElementRegistry to call AddStates.
friend class CustomElementRegistry;
// Also need to allow Link to call UpdateLinkState.
friend class Link;
void NotifyStateChange(EventStates aStates);
void NotifyStyleStateChange(EventStates aStates);
// Style state computed from element's state and style locks.
EventStates StyleStateFromLocks() const;
protected:
// Methods for the ESM, nsGlobalWindow and focus manager 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.
virtual void AddStates(EventStates aStates)
{
NS_PRECONDITION(!aStates.HasAtLeastOneOfStates(INTRINSIC_STATES),
"Should only be adding externally-managed states here");
AddStatesSilently(aStates);
NotifyStateChange(aStates);
}
virtual void RemoveStates(EventStates aStates)
{
NS_PRECONDITION(!aStates.HasAtLeastOneOfStates(INTRINSIC_STATES),
"Should only be removing externally-managed states here");
RemoveStatesSilently(aStates);
NotifyStateChange(aStates);
}
public:
// Public methods to manage state bits in MANUALLY_MANAGED_STATES.
void AddManuallyManagedStates(EventStates aStates)
{
MOZ_ASSERT(MANUALLY_MANAGED_STATES.HasAllStates(aStates),
"Should only be adding manually-managed states here");
AddStates(aStates);
}
void RemoveManuallyManagedStates(EventStates aStates)
{
MOZ_ASSERT(MANUALLY_MANAGED_STATES.HasAllStates(aStates),
"Should only be removing manually-managed states here");
RemoveStates(aStates);
}
virtual void UpdateEditableState(bool aNotify) override;
virtual nsresult BindToTree(nsIDocument* aDocument, nsIContent* aParent,
nsIContent* aBindingParent,
bool aCompileEventHandlers) override;
virtual void UnbindFromTree(bool aDeep = true,
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;
nsresult SetAttr(int32_t aNameSpaceID, nsIAtom* aName,
const nsAString& aValue, bool aNotify)
{
return SetAttr(aNameSpaceID, aName, nullptr, aValue, aNotify);
}
/**
* 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 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 Set to nsIDOMMutationEvent::MODIFICATION or to
* nsIDOMMutationEvent::ADDITION, but only if this helper returns true
* @param aHasListeners Set to true if there are mutation event listeners
* listening for NS_EVENT_BITS_MUTATION_ATTRMODIFIED
*/
bool MaybeCheckSameAttrVal(int32_t aNamespaceID, nsIAtom* aName,
nsIAtom* aPrefix,
const nsAttrValueOrString& aValue,
bool aNotify, nsAttrValue& aOldValue,
uint8_t* aModType, bool* aHasListeners);
bool OnlyNotifySameValueSet(int32_t aNamespaceID, nsIAtom* aName,
nsIAtom* aPrefix,
const nsAttrValueOrString& aValue,
bool aNotify, nsAttrValue& aOldValue,
uint8_t* aModType, bool* aHasListeners);
virtual nsresult SetAttr(int32_t aNameSpaceID, nsIAtom* aName, nsIAtom* aPrefix,
const nsAString& aValue, bool aNotify) override;
// 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, nsIAtom* aName, nsIAtom* aPrefix,
nsAttrValue& aParsedValue, bool aNotify);
// GetAttr is not inlined on purpose, to keep down codesize from all
// the inlined nsAttrValue bits for C++ callers.
bool GetAttr(int32_t aNameSpaceID, nsIAtom* aName,
nsAString& aResult) const;
inline bool HasAttr(int32_t aNameSpaceID, nsIAtom* aName) const;
// aCaseSensitive == eIgnoreCaase means ASCII case-insensitive matching.
inline bool AttrValueIs(int32_t aNameSpaceID, nsIAtom* aName,
const nsAString& aValue,
nsCaseTreatment aCaseSensitive) const;
inline bool AttrValueIs(int32_t aNameSpaceID, nsIAtom* aName,
nsIAtom* aValue,
nsCaseTreatment aCaseSensitive) const;
virtual int32_t FindAttrValueIn(int32_t aNameSpaceID,
nsIAtom* aName,
AttrValuesArray* aValues,
nsCaseTreatment aCaseSensitive) const override;
virtual nsresult UnsetAttr(int32_t aNameSpaceID, nsIAtom* aAttribute,
bool aNotify) override;
virtual const nsAttrName* GetAttrNameAt(uint32_t aIndex) const override;
virtual BorrowedAttrInfo GetAttrInfoAt(uint32_t aIndex) const override;
virtual uint32_t GetAttrCount() const override;
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 DoGetClasses();
}
return nullptr;
}
#ifdef DEBUG
virtual void List(FILE* out = stdout, int32_t aIndent = 0) const override
{
List(out, aIndent, EmptyCString());
}
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
void Describe(nsAString& aOutDescription) const override;
/*
* Attribute Mapping Helpers
*/
struct MappedAttributeEntry {
nsIAtom** 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 nsIAtom* aAttribute,
const MappedAttributeEntry* const (&aMaps)[N])
{
return FindAttributeDependence(aAttribute, aMaps, N);
}
static nsIAtom*** HTMLSVGPropertiesToTraverseAndUnlink();
private:
void DescribeAttribute(uint32_t index, nsAString& aOutDescription) const;
static bool
FindAttributeDependence(const nsIAtom* aAttribute,
const MappedAttributeEntry* const aMaps[],
uint32_t aMapCount);
protected:
inline bool GetAttr(int32_t aNameSpaceID, nsIAtom* 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.HasStringBuffer() && aResult.StringBufferLength() == 0,
"Should have empty string coming in");
const nsAttrValue* val = mAttrsAndChildren.GetAttr(aName, aNameSpaceID);
if (val) {
val->ToString(aResult);
return true;
}
// else DOMString comes pre-emptied.
return false;
}
public:
bool HasAttrs() const { return mAttrsAndChildren.HasAttrs(); }
inline bool GetAttr(const nsAString& aName, DOMString& aResult) const
{
MOZ_ASSERT(aResult.HasStringBuffer() && aResult.StringBufferLength() == 0,
"Should have empty string coming in");
const nsAttrValue* val = mAttrsAndChildren.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();
nsDOMAttributeMap* Attributes()
{
nsDOMSlots* slots = DOMSlots();
if (!slots->mAttributeMap) {
slots->mAttributeMap = new nsDOMAttributeMap(this);
}
return slots->mAttributeMap;
}
void GetAttributeNames(nsTArray<nsString>& aResult);
void GetAttribute(const nsAString& aName, nsString& 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);
void SetAttribute(const nsAString& aName, const nsAString& aValue,
ErrorResult& aError);
void SetAttributeNS(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 nsAString& aSelector,
ErrorResult& aResult);
bool Matches(const nsAString& 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);
CSSPseudoElementType GetPseudoElementType() const {
if (!HasProperties()) {
return CSSPseudoElementType::NotPseudo;
}
nsresult rv = NS_OK;
auto raw = GetProperty(nsGkAtoms::pseudoProperty, &rv);
if (rv == NS_PROPTABLE_PROP_NOT_THERE) {
return CSSPseudoElementType::NotPseudo;
}
return CSSPseudoElementType(reinterpret_cast<uintptr_t>(raw));
}
void SetPseudoElementType(CSSPseudoElementType aPseudo) {
static_assert(sizeof(CSSPseudoElementType) <= sizeof(uintptr_t),
"Need to be able to store this in a void*");
MOZ_ASSERT(aPseudo != CSSPseudoElementType::NotPseudo);
SetProperty(nsGkAtoms::pseudoProperty, reinterpret_cast<void*>(aPseudo));
}
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)
{
bool activeState = false;
if (!nsIPresShell::GetPointerInfo(aPointerId, activeState)) {
aError.Throw(NS_ERROR_DOM_INVALID_POINTER_ERR);
return;
}
if (!IsInUncomposedDoc()) {
aError.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return;
}
if (!activeState) {
return;
}
nsIPresShell::SetPointerCapturingContent(aPointerId, this);
}
void ReleasePointerCapture(int32_t aPointerId, ErrorResult& aError)
{
bool activeState = false;
if (!nsIPresShell::GetPointerInfo(aPointerId, activeState)) {
aError.Throw(NS_ERROR_DOM_INVALID_POINTER_ERR);
return;
}
if (HasPointerCapture(aPointerId)) {
nsIPresShell::ReleasePointerCapturingContent(aPointerId);
}
}
bool HasPointerCapture(long aPointerId)
{
nsIPresShell::PointerCaptureInfo* pointerCaptureInfo =
nsIPresShell::GetPointerCaptureInfo(aPointerId);
if (pointerCaptureInfo && pointerCaptureInfo->mPendingContent == this) {
return true;
}
return false;
}
void 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 (!nsIPresShell::GetCapturingContent()) {
nsIPresShell::SetCapturingContent(this, CAPTURE_PREVENTDRAG |
(aRetargetToElement ? CAPTURE_RETARGETTOELEMENT : 0));
}
}
void SetCaptureAlways(bool aRetargetToElement)
{
nsIPresShell::SetCapturingContent(this,
CAPTURE_PREVENTDRAG | CAPTURE_IGNOREALLOWED |
(aRetargetToElement ? CAPTURE_RETARGETTOELEMENT : 0));
}
void ReleaseCapture()
{
if (nsIPresShell::GetCapturingContent() == this) {
nsIPresShell::SetCapturingContent(nullptr, 0);
}
}
void RequestFullscreen(CallerType aCallerType, ErrorResult& aError);
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);
already_AddRefed<DOMRectList> GetClientRects();
already_AddRefed<DOMRect> GetBoundingClientRect();
already_AddRefed<ShadowRoot> CreateShadowRoot(ErrorResult& aError);
already_AddRefed<DestinationInsertionPointList> GetDestinationInsertionPoints();
ShadowRoot *FastGetShadowRoot() const
{
nsDOMSlots* slots = GetExistingDOMSlots();
return slots ? slots->mShadowRoot.get() : nullptr;
}
void ScrollIntoView();
void ScrollIntoView(bool aTop);
void ScrollIntoView(const ScrollIntoViewOptions &aOptions);
void Scroll(double aXScroll, double aYScroll);
void Scroll(const ScrollToOptions& aOptions);
void ScrollTo(double aXScroll, double aYScroll);
void ScrollTo(const ScrollToOptions& aOptions);
void ScrollBy(double aXScrollDif, double aYScrollDif);
void ScrollBy(const ScrollToOptions& aOptions);
/* Scrolls without flushing the layout.
* aDx is the x offset, aDy the y offset in CSS pixels.
* Returns true if we actually scrolled.
*/
bool ScrollByNoFlush(int32_t aDx, int32_t aDy);
int32_t ScrollTop();
void SetScrollTop(int32_t aScrollTop);
int32_t ScrollLeft();
void SetScrollLeft(int32_t aScrollLeft);
int32_t ScrollWidth();
int32_t ScrollHeight();
void MozScrollSnap();
int32_t ClientTop()
{
return nsPresContext::AppUnitsToIntCSSPixels(GetClientAreaRect().y);
}
int32_t ClientLeft()
{
return nsPresContext::AppUnitsToIntCSSPixels(GetClientAreaRect().x);
}
int32_t ClientWidth()
{
return nsPresContext::AppUnitsToIntCSSPixels(GetClientAreaRect().width);
}
int32_t ClientHeight()
{
return nsPresContext::AppUnitsToIntCSSPixels(GetClientAreaRect().height);
}
int32_t ScrollTopMin()
{
nsIScrollableFrame* sf = GetScrollFrame();
return sf ?
nsPresContext::AppUnitsToIntCSSPixels(sf->GetScrollRange().y) : 0;
}
int32_t ScrollTopMax()
{
nsIScrollableFrame* sf = GetScrollFrame();
return sf ?
nsPresContext::AppUnitsToIntCSSPixels(sf->GetScrollRange().YMost()) :
0;
}
int32_t ScrollLeftMin()
{
nsIScrollableFrame* sf = GetScrollFrame();
return sf ?
nsPresContext::AppUnitsToIntCSSPixels(sf->GetScrollRange().x) : 0;
}
int32_t ScrollLeftMax()
{
nsIScrollableFrame* sf = GetScrollFrame();
return sf ?
nsPresContext::AppUnitsToIntCSSPixels(sf->GetScrollRange().XMost()) :
0;
}
void GetGridFragments(nsTArray<RefPtr<Grid>>& aResult);
already_AddRefed<Animation>
Animate(JSContext* aContext,
JS::Handle<JSObject*> aKeyframes,
const UnrestrictedDoubleOrKeyframeAnimationOptions& aOptions,
ErrorResult& aError);
// A helper method that factors out the common functionality needed by
// Element::Animate and CSSPseudoElement::Animate
static already_AddRefed<Animation>
Animate(const Nullable<ElementOrCSSPseudoElement>& aTarget,
JSContext* aContext,
JS::Handle<JSObject*> aKeyframes,
const UnrestrictedDoubleOrKeyframeAnimationOptions& aOptions,
ErrorResult& aError);
// Note: GetAnimations will flush style while GetAnimationsUnsorted won't.
// Callers must keep this element alive because flushing style may destroy
// this element.
void GetAnimations(const AnimationFilter& filter,
nsTArray<RefPtr<Animation>>& aAnimations);
static void GetAnimationsUnsorted(Element* aElement,
CSSPseudoElementType aPseudoType,
nsTArray<RefPtr<Animation>>& aAnimations);
NS_IMETHOD GetInnerHTML(nsAString& aInnerHTML);
virtual void SetInnerHTML(const nsAString& aInnerHTML, ErrorResult& aError);
void GetOuterHTML(nsAString& aOuterHTML);
void SetOuterHTML(const nsAString& aOuterHTML, ErrorResult& aError);
void InsertAdjacentHTML(const nsAString& aPosition, const nsAString& aText,
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
*/
nsresult SetEventHandler(nsIAtom* 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.
*/
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;
static nsresult DispatchEvent(nsPresContext* aPresContext,
WidgetEvent* aEvent,
nsIContent* aTarget,
bool aFullDispatch,
nsEventStatus* aStatus);
/**
* Get the primary frame for this content with flushing
*
* @param aType the kind of flush to do, typically FlushType::Frames or
* FlushType::Layout
* @return the primary frame
*/
nsIFrame* GetPrimaryFrame(FlushType aType);
// Work around silly C++ name hiding stuff
nsIFrame* GetPrimaryFrame() const { return nsIContent::GetPrimaryFrame(); }
const nsAttrValue* GetParsedAttr(nsIAtom* aAttr) const
{
return mAttrsAndChildren.GetAttr(aAttr);
}
const nsAttrValue* GetParsedAttr(nsIAtom* aAttr, int32_t aNameSpaceID) const
{
return mAttrsAndChildren.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;
}
virtual 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 mAttrsAndChildren.
*/
virtual BorrowedAttrInfo GetAttrInfo(int32_t aNamespaceID, nsIAtom* aName) const;
/**
* Called when we have been adopted, and the information of the
* node has been changed.
*
* The new document can be reached via OwnerDoc().
*
* If you override this method,
* please call up to the parent NodeInfoChanged.
*
* If you change this, change also the similar method in Link.
*/
virtual void NodeInfoChanged(nsIDocument* aOldDoc) {}
/**
* 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);
virtual JSObject* WrapObject(JSContext *aCx, JS::Handle<JSObject*> aGivenProto) final override;
nsINode* GetScopeChainParent() const override;
/**
* Locate an nsIEditor rooted at this content node, if there is one.
*/
nsIEditor* GetEditorInternal();
/**
* Helper method for NS_IMPL_BOOL_ATTR macro.
* 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(nsIAtom* aAttr) const
{
return HasAttr(kNameSpaceID_None, aAttr);
}
/**
* Helper method for NS_IMPL_BOOL_ATTR macro.
* 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(nsIAtom* aAttr, bool aValue);
/**
* Helper method for NS_IMPL_ENUM_ATTR_DEFAULT_VALUE.
* 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(nsIAtom* aAttr,
const char* aDefault,
nsAString& aResult) const;
/**
* Helper method for NS_IMPL_ENUM_ATTR_DEFAULT_MISSING_INVALID_VALUES.
* 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(nsIAtom* aAttr,
const char* aDefaultMissing,
const char* aDefaultInvalid,
nsAString& aResult) const;
/**
* Unset an attribute.
*/
void UnsetAttr(nsIAtom* aAttr, ErrorResult& aError)
{
aError = UnsetAttr(kNameSpaceID_None, aAttr, true);
}
/**
* Set an attribute in the simplest way possible.
*/
void SetAttr(nsIAtom* aAttr, const nsAString& aValue, ErrorResult& aError)
{
aError = SetAttr(kNameSpaceID_None, aAttr, aValue, 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(nsIAtom* 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();
net::ReferrerPolicy GetReferrerPolicyAsEnum();
/*
* 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);
bool UpdateIntersectionObservation(DOMIntersectionObserver* aObserver, int32_t threshold);
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.
* @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 aModType nsIDOMMutationEvent::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,
nsIAtom* aName,
nsIAtom* aPrefix,
const nsAttrValue& aOldValue,
nsAttrValue& aParsedValue,
uint8_t aModType,
bool aFireMutation,
bool aNotify,
bool aCallAfterSetAttr,
nsIDocument* 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
*/
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 aResult the nsAttrValue [OUT]
* @return true if the parsing was successful, false otherwise
*/
virtual bool ParseAttribute(int32_t aNamespaceID,
nsIAtom* aAttribute,
const nsAString& aValue,
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
* @param [out] aRetval the nsresult status of the operation, if any.
* @return true if the setting was attempted, false otherwise.
*/
virtual bool SetMappedAttribute(nsIAtom* aName,
nsAttrValue& aValue,
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.
*/
// Note that this is inlined so that when subclasses call it it gets
// inlined. Those calls don't go through a vtable.
virtual nsresult BeforeSetAttr(int32_t aNamespaceID, nsIAtom* aName,
const nsAttrValueOrString* aValue,
bool aNotify)
{
return NS_OK;
}
/**
* Hook that is called by Element::SetAttr to allow subclasses to
* deal with attribute sets. This will only be called after we have called
* SetAndTakeAttr and AttributeChanged (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 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 AfterSetAttr(int32_t aNamespaceID, nsIAtom* aName,
const nsAttrValue* aValue, bool aNotify)
{
return NS_OK;
}
/**
* Hook to allow subclasses to produce a different EventListenerManager if
* needed for attachment of attribute-defined handlers
*/
virtual EventListenerManager*
GetEventListenerManagerForAttr(nsIAtom* 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;
nsIFrame* GetStyledFrame();
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(nsIAtom* 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
* @param aURI the uri of the link, set only if the return value is true [OUT]
* @return true if we can handle the link event, false otherwise
*/
bool CheckHandleEventForLinksPrecondition(EventChainVisitor& aVisitor,
nsIURI** aURI) const;
/**
* Handle status bar updates before they can be cancelled.
*/
nsresult GetEventTargetParentForLinks(EventChainPreVisitor& aVisitor);
/**
* Handle default actions for link event if the event isn't consumed yet.
*/
nsresult PostHandleEventForLinks(EventChainPostVisitor& aVisitor);
/**
* 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);
nsDOMTokenList* GetTokenList(nsIAtom* aAtom,
const DOMTokenListSupportedTokenArray aSupportedTokens = nullptr);
nsDataHashtable<nsRefPtrHashKey<DOMIntersectionObserver>, int32_t>*
RegisteredIntersectionObservers();
private:
/**
* Hook for implementing GetClasses. This is guaranteed to only be
* called if the NODE_MAY_HAVE_CLASS flag is set.
*/
const nsAttrValue* DoGetClasses() const;
/**
* Get this element's client area rect in app units.
* @return the frame's client area
*/
nsRect GetClientAreaRect();
nsIScrollableFrame* GetScrollFrame(nsIFrame **aStyledFrame = nullptr,
bool aFlushLayout = true);
// Data members
EventStates mState;
#ifdef MOZ_STYLO
// Per-node data managed by Servo.
mozilla::ServoCell<ServoNodeData*> mServoData;
#endif
};
class RemoveFromBindingManagerRunnable : public mozilla::Runnable
{
public:
RemoveFromBindingManagerRunnable(nsBindingManager* aManager,
nsIContent* aContent,
nsIDocument* aDoc);
NS_IMETHOD Run() override;
private:
virtual ~RemoveFromBindingManagerRunnable();
RefPtr<nsBindingManager> mManager;
RefPtr<nsIContent> mContent;
nsCOMPtr<nsIDocument> mDoc;
};
class DestinationInsertionPointList : public nsINodeList
{
public:
explicit DestinationInsertionPointList(Element* aElement);
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(DestinationInsertionPointList)
// nsIDOMNodeList
NS_DECL_NSIDOMNODELIST
// nsINodeList
virtual nsIContent* Item(uint32_t aIndex) override;
virtual int32_t IndexOf(nsIContent* aContent) override;
virtual nsINode* GetParentObject() override { return mParent; }
virtual uint32_t Length() const;
virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
protected:
virtual ~DestinationInsertionPointList();
RefPtr<Element> mParent;
nsCOMArray<nsIContent> mDestinationPoints;
};
NS_DEFINE_STATIC_IID_ACCESSOR(Element, NS_ELEMENT_IID)
inline bool
Element::HasAttr(int32_t aNameSpaceID, nsIAtom* aName) const
{
NS_ASSERTION(nullptr != aName, "must have attribute name");
NS_ASSERTION(aNameSpaceID != kNameSpaceID_Unknown,
"must have a real namespace ID!");
return mAttrsAndChildren.IndexOfAttr(aName, aNameSpaceID) >= 0;
}
inline bool
Element::AttrValueIs(int32_t aNameSpaceID,
nsIAtom* aName,
const nsAString& aValue,
nsCaseTreatment aCaseSensitive) const
{
NS_ASSERTION(aName, "Must have attr name");
NS_ASSERTION(aNameSpaceID != kNameSpaceID_Unknown, "Must have namespace");
const nsAttrValue* val = mAttrsAndChildren.GetAttr(aName, aNameSpaceID);
return val && val->Equals(aValue, aCaseSensitive);
}
inline bool
Element::AttrValueIs(int32_t aNameSpaceID,
nsIAtom* aName,
nsIAtom* aValue,
nsCaseTreatment aCaseSensitive) const
{
NS_ASSERTION(aName, "Must have attr name");
NS_ASSERTION(aNameSpaceID != kNameSpaceID_Unknown, "Must have namespace");
NS_ASSERTION(aValue, "Null value atom");
const nsAttrValue* val = mAttrsAndChildren.GetAttr(aName, aNameSpaceID);
return val && val->Equals(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 void nsINode::UnsetRestyleFlagsIfGecko()
{
if (IsElement() && !AsElement()->IsStyledByServo()) {
UnsetFlags(ELEMENT_ALL_RESTYLE_FLAGS);
}
}
/**
* 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, \
bool aPreallocateChildren) const \
{ \
*aResult = nullptr; \
already_AddRefed<mozilla::dom::NodeInfo> ni = \
RefPtr<mozilla::dom::NodeInfo>(aNodeInfo).forget(); \
_elementName *it = new _elementName(ni); \
if (!it) { \
return NS_ERROR_OUT_OF_MEMORY; \
} \
\
nsCOMPtr<nsINode> kungFuDeathGrip = it; \
nsresult rv = const_cast<_elementName*>(this)->CopyInnerTo(it, aPreallocateChildren); \
if (NS_SUCCEEDED(rv)) { \
kungFuDeathGrip.swap(*aResult); \
} \
\
return rv; \
}
#define NS_IMPL_ELEMENT_CLONE_WITH_INIT(_elementName) \
nsresult \
_elementName::Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult, \
bool aPreallocateChildren) const \
{ \
*aResult = nullptr; \
already_AddRefed<mozilla::dom::NodeInfo> ni = \
RefPtr<mozilla::dom::NodeInfo>(aNodeInfo).forget(); \
_elementName *it = new _elementName(ni); \
if (!it) { \
return NS_ERROR_OUT_OF_MEMORY; \
} \
\
nsCOMPtr<nsINode> kungFuDeathGrip = it; \
nsresult rv = it->Init(); \
nsresult rv2 = const_cast<_elementName*>(this)->CopyInnerTo(it, aPreallocateChildren); \
if (NS_FAILED(rv2)) { \
rv = rv2; \
} \
if (NS_SUCCEEDED(rv)) { \
kungFuDeathGrip.swap(*aResult); \
} \
\
return rv; \
}
/**
* A macro to implement the getter and setter for a given string
* valued content property. The method uses the generic GetAttr and
* SetAttr methods. We use the 5-argument form of SetAttr, because
* some consumers only implement that one, hiding superclass
* 4-argument forms.
*/
#define NS_IMPL_STRING_ATTR(_class, _method, _atom) \
NS_IMETHODIMP \
_class::Get##_method(nsAString& aValue) \
{ \
GetAttr(kNameSpaceID_None, nsGkAtoms::_atom, aValue); \
return NS_OK; \
} \
NS_IMETHODIMP \
_class::Set##_method(const nsAString& aValue) \
{ \
return SetAttr(kNameSpaceID_None, nsGkAtoms::_atom, nullptr, aValue, true); \
}
/**
* A macro to implement the getter and setter for a given boolean
* valued content property. The method uses the GetBoolAttr and
* SetBoolAttr methods.
*/
#define NS_IMPL_BOOL_ATTR(_class, _method, _atom) \
NS_IMETHODIMP \
_class::Get##_method(bool* aValue) \
{ \
*aValue = GetBoolAttr(nsGkAtoms::_atom); \
return NS_OK; \
} \
NS_IMETHODIMP \
_class::Set##_method(bool aValue) \
{ \
return SetBoolAttr(nsGkAtoms::_atom, aValue); \
}
#define NS_FORWARD_NSIDOMELEMENT_TO_GENERIC \
typedef mozilla::dom::Element Element; \
NS_IMETHOD GetTagName(nsAString& aTagName) final override \
{ \
Element::GetTagName(aTagName); \
return NS_OK; \
} \
NS_IMETHOD GetAttributes(nsIDOMMozNamedAttrMap** aAttributes) final override \
{ \
NS_ADDREF(*aAttributes = Attributes()); \
return NS_OK; \
} \
using Element::GetAttribute; \
NS_IMETHOD GetAttribute(const nsAString& name, nsAString& _retval) final \
override \
{ \
nsString attr; \
GetAttribute(name, attr); \
_retval = attr; \
return NS_OK; \
} \
NS_IMETHOD SetAttribute(const nsAString& name, \
const nsAString& value) override \
{ \
mozilla::ErrorResult rv; \
Element::SetAttribute(name, value, rv); \
return rv.StealNSResult(); \
} \
using Element::HasAttribute; \
NS_IMETHOD HasAttribute(const nsAString& name, \
bool* _retval) final override \
{ \
*_retval = HasAttribute(name); \
return NS_OK; \
} \
NS_IMETHOD GetAttributeNode(const nsAString& name, \
nsIDOMAttr** _retval) final override \
{ \
NS_IF_ADDREF(*_retval = Element::GetAttributeNode(name)); \
return NS_OK; \
} \
NS_IMETHOD GetAttributeNodeNS(const nsAString& namespaceURI, \
const nsAString& localName, \
nsIDOMAttr** _retval) final override \
{ \
NS_IF_ADDREF(*_retval = Element::GetAttributeNodeNS(namespaceURI, \
localName)); \
return NS_OK; \
}
#endif // mozilla_dom_Element_h__
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