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gecko-dev/dom/base/Element.h

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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 Element, 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 "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 "nsAttrValueInlines.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/dom/PointerEventHandler.h"
#include "mozilla/UniquePtr.h"
#include "Units.h"
#include "DOMIntersectionObserver.h"
class mozAutoDocUpdate;
class nsIFrame;
class nsIMozBrowserFrame;
class nsIURI;
class nsIScrollableFrame;
class nsAttrValueOrString;
class nsContentList;
class nsDOMTokenList;
struct nsRect;
class nsFocusManager;
class nsGlobalWindowInner;
class nsGlobalWindowOuter;
class nsDOMCSSAttributeDeclaration;
class nsISMILAttr;
class nsDocument;
class nsDOMStringMap;
namespace mozilla {
class DeclarationBlock;
class TextEditor;
namespace css {
struct URLValue;
} // namespace css
namespace dom {
struct AnimationFilter;
struct ScrollIntoViewOptions;
struct ScrollToOptions;
class DOMIntersectionObserver;
class DOMMatrixReadOnly;
class Element;
class ElementOrCSSPseudoElement;
class UnrestrictedDoubleOrKeyframeAnimationOptions;
enum class CallerType : uint32_t;
typedef nsDataHashtable<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),
// 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 {
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 } }
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() == 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_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);
/**
* Sets or unsets an XBL binding for this element. Setting a
* binding on an element that already has a binding will remove the
* old binding.
*
* @param aBinding The binding to bind to this content. If nullptr is
* provided as the argument, then existing binding will be
* removed.
*
* @param aOldBindingManager The old binding manager that contains
* this content if this content was adopted
* to another document.
*/
void SetXBLBinding(nsXBLBinding* aBinding,
nsBindingManager* aOldBindingManager = nullptr);
/**
* 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);
/**
* 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();
/**
* Accessors for the state of our dir attribute.
*/
bool HasDirAuto() const
{
return State().HasState(NS_EVENT_STATE_DIR_ATTR_LIKE_AUTO);
}
/**
* Elements with dir="rtl" or dir="ltr".
*/
bool HasFixedDir() const
{
return State().HasAtLeastOneOfStates(NS_EVENT_STATE_DIR_ATTR_LTR |
NS_EVENT_STATE_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() {
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.
*/
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.
*/
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,
nsAtom* 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.
*/
nsDOMCSSAttributeDeclaration* 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 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(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);
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(nsIDocument* 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
{
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(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.
*/
void SetCustomElementDefinition(CustomElementDefinition* aDefinition);
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;
}
already_AddRefed<ShadowRoot> AttachShadowInternal(
ShadowRootMode, ErrorResult& aError);
private:
// Need to allow the ESM, nsGlobalWindow, and the focus manager to
// set our state
friend class mozilla::EventStateManager;
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(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)
{
MOZ_ASSERT(!aStates.HasAtLeastOneOfStates(INTRINSIC_STATES),
"Should only be adding externally-managed states here");
AddStatesSilently(aStates);
NotifyStateChange(aStates);
}
virtual void RemoveStates(EventStates aStates)
{
MOZ_ASSERT(!aStates.HasAtLeastOneOfStates(INTRINSIC_STATES),
"Should only be removing externally-managed states here");
RemoveStatesSilently(aStates);
NotifyStateChange(aStates);
}
virtual void ToggleStates(EventStates aStates, bool aNotify)
{
MOZ_ASSERT(!aStates.HasAtLeastOneOfStates(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(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;
/**
* 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 MutationEventBinding::MODIFICATION or to
* MutationEventBinding::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, nsAtom* aName,
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 MutationEventBinding::MODIFICATION or to
* MutationEventBinding::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, nsAtom* aName, nsAString& aResult) const;
bool GetAttr(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, nsAtom* aName) const;
bool HasAttr(nsAtom* aAttr) const
{
return HasAttr(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, 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,
nsAtom* aName,
nsAtom* aValue,
nsCaseTreatment aCaseSensitive) const;
enum {
ATTR_MISSING = -1,
ATTR_VALUE_NO_MATCH = -2
};
/**
* 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
*/
typedef nsStaticAtom* const* const AttrValuesArray;
int32_t FindAttrValueIn(int32_t aNameSpaceID,
nsAtom* aName,
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 mAttrsAndChildren.GetSafeAttrNameAt(aIndex);
}
/**
* Gets the attribute info (name and value) for this element at a given index.
*/
BorrowedAttrInfo GetAttrInfoAt(uint32_t aIndex) const
{
if (aIndex >= mAttrsAndChildren.AttrCount()) {
return BorrowedAttrInfo(nullptr, nullptr);
}
return mAttrsAndChildren.AttrInfoAt(aIndex);
}
/**
* Get the number of all specified attributes.
*
* @return the number of attributes
*/
uint32_t GetAttrCount() const
{
return mAttrsAndChildren.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 DoGetClasses();
}
return nullptr;
}
/**
* Hook for implementing GetClasses. This should only be called if the
* ElementMayHaveClass flag is set.
*
* Public only because Servo needs to call it too, and it ensures the
* precondition before calling this.
*/
const nsAttrValue* DoGetClasses() const
{
MOZ_ASSERT(MayHaveClass(), "Unexpected call");
if (IsSVGElement()) {
if (const nsAttrValue* value = GetSVGAnimatedClass()) {
return value;
}
}
return GetParsedAttr(nsGkAtoms::_class);
}
#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
/**
* Append to aOutDescription a short (preferably one line) string
* describing the element.
*/
void Describe(nsAString& aOutDescription) const;
/*
* Attribute Mapping Helpers
*/
struct MappedAttributeEntry {
nsStaticAtom** 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*** 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, 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 = 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.IsEmpty(), "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, 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);
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);
}
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 {
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));
}
/**
* Return an array of all elements in the subtree rooted at this
* element that are styled as grid containers. This includes
* elements that don't actually generate any frames (by virtue of
* being in a 'display:none' subtree), but this does not include
* pseudo-elements.
*/
void GetElementsWithGrid(nsTArray<RefPtr<Element>>& aElements);
private:
/**
* Define a general matching function that can be passed to
* GetElementsByMatching(). Each Element being considered is
* passed in.
*/
typedef bool (*nsElementMatchFunc)(Element* aElement);
void GetElementsByMatching(nsElementMatchFunc aFunc,
nsTArray<RefPtr<Element>>& aElements);
/**
* 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 (!PointerEventHandler::GetPointerInfo(aPointerId, activeState)) {
aError.Throw(NS_ERROR_DOM_INVALID_POINTER_ERR);
return;
}
if (!IsInUncomposedDoc()) {
aError.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return;
}
if (OwnerDoc()->GetPointerLockElement()) {
// Throw an exception 'InvalidStateError' while the page has a locked
// element.
aError.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return;
}
if (!activeState) {
return;
}
PointerEventHandler::SetPointerCaptureById(aPointerId, this);
}
void ReleasePointerCapture(int32_t aPointerId, ErrorResult& aError)
{
bool activeState = false;
if (!PointerEventHandler::GetPointerInfo(aPointerId, activeState)) {
aError.Throw(NS_ERROR_DOM_INVALID_POINTER_ERR);
return;
}
if (HasPointerCapture(aPointerId)) {
PointerEventHandler::ReleasePointerCaptureById(aPointerId);
}
}
bool HasPointerCapture(long aPointerId)
{
PointerCaptureInfo* pointerCaptureInfo =
PointerEventHandler::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);
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);
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;
}
private:
void ScrollIntoView(const ScrollIntoViewOptions &aOptions);
public:
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);
/* Scrolls without flushing the layout.
* aDx is the x offset, aDy the y offset in CSS pixels.
* Returns true if we actually scrolled.
*/
MOZ_CAN_RUN_SCRIPT bool ScrollByNoFlush(int32_t aDx, int32_t aDy);
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 nsPresContext::AppUnitsToIntCSSPixels(GetClientAreaRect().y);
}
MOZ_CAN_RUN_SCRIPT int32_t ClientLeft()
{
return nsPresContext::AppUnitsToIntCSSPixels(GetClientAreaRect().x);
}
MOZ_CAN_RUN_SCRIPT int32_t ClientWidth()
{
return nsPresContext::AppUnitsToIntCSSPixels(GetClientAreaRect().Width());
}
MOZ_CAN_RUN_SCRIPT int32_t ClientHeight()
{
return nsPresContext::AppUnitsToIntCSSPixels(GetClientAreaRect().Height());
}
MOZ_CAN_RUN_SCRIPT int32_t ScrollTopMin()
{
nsIScrollableFrame* sf = GetScrollFrame();
return sf ?
nsPresContext::AppUnitsToIntCSSPixels(sf->GetScrollRange().y) : 0;
}
MOZ_CAN_RUN_SCRIPT int32_t ScrollTopMax()
{
nsIScrollableFrame* sf = GetScrollFrame();
return sf ?
nsPresContext::AppUnitsToIntCSSPixels(sf->GetScrollRange().YMost()) :
0;
}
MOZ_CAN_RUN_SCRIPT int32_t ScrollLeftMin()
{
nsIScrollableFrame* sf = GetScrollFrame();
return sf ?
nsPresContext::AppUnitsToIntCSSPixels(sf->GetScrollRange().x) : 0;
}
MOZ_CAN_RUN_SCRIPT int32_t ScrollLeftMax()
{
nsIScrollableFrame* sf = GetScrollFrame();
return sf ?
nsPresContext::AppUnitsToIntCSSPixels(sf->GetScrollRange().XMost()) :
0;
}
already_AddRefed<Flex> GetAsFlexContainer();
void GetGridFragments(nsTArray<RefPtr<Grid>>& aResult);
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);
// 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);
virtual void GetInnerHTML(nsAString& aInnerHTML, OOMReporter& aError);
virtual void SetInnerHTML(const nsAString& aInnerHTML, nsIPrincipal* aSubjectPrincipal, ErrorResult& aError);
void UnsafeSetInnerHTML(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(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.
*/
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(); }
bool IsDisplayContents() const
{
return HasServoData() && Servo_Element_IsDisplayContents(this);
}
const nsAttrValue* GetParsedAttr(nsAtom* aAttr) const
{
return mAttrsAndChildren.GetAttr(aAttr);
}
const nsAttrValue* GetParsedAttr(nsAtom* 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.
*/
BorrowedAttrInfo GetAttrInfo(int32_t aNamespaceID, nsAtom* aName) const
{
NS_ASSERTION(aName, "must have attribute name");
NS_ASSERTION(aNamespaceID != kNameSpaceID_Unknown,
"must have a real namespace ID!");
int32_t index = mAttrsAndChildren.IndexOfAttr(aName, aNamespaceID);
if (index < 0) {
return BorrowedAttrInfo(nullptr, nullptr);
}
return mAttrsAndChildren.AttrInfoAt(index);
}
/**
* 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);
JSObject* WrapObject(JSContext *aCx, JS::Handle<JSObject*> aGivenProto) final;
nsINode* GetScopeChainParent() const override;
/**
* Locate a TextEditor rooted at this content node, if there is one.
*/
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();
net::ReferrerPolicy GetReferrerPolicyAsEnum();
net::ReferrerPolicy ReferrerPolicyFromAttr(const nsAttrValue* aValue);
/*
* 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);
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 MutationEventBinding::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,
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
*/
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.
*/
// 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, nsAtom* aName,
const nsAttrValue* aValue,
const nsAttrValue* aOldValue,
nsIPrincipal* aMaybeScriptedPrincipal,
bool aNotify)
{
return NS_OK;
}
/**
* 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;
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(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
* @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.
*/
void 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(nsAtom* aAtom,
const DOMTokenListSupportedTokenArray aSupportedTokens = nullptr);
private:
/**
* Slow path for DoGetClasses, 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();
MOZ_CAN_RUN_SCRIPT
nsIScrollableFrame* GetScrollFrame(nsIFrame **aStyledFrame = nullptr,
FlushType aFlushType = FlushType::Layout);
// Data members
EventStates mState;
// Per-node data managed by Servo.
//
// There should not be data on nodes that are in the flattened tree, or
// descendants of display: none elements.
mozilla::ServoCell<ServoNodeData*> mServoData;
};
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;
};
NS_DEFINE_STATIC_IID_ACCESSOR(Element, NS_ELEMENT_IID)
inline bool
Element::HasAttr(int32_t aNameSpaceID, nsAtom* 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,
nsAtom* 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,
nsAtom* aName,
nsAtom* 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 mozilla::dom::Element* nsINode::GetParentElement() const
{
return mParent && mParent->IsElement() ? mParent->AsElement() : 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, \
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 EXPAND(...) __VA_ARGS__
#define NS_IMPL_ELEMENT_CLONE_WITH_INIT_HELPER(_elementName, extra_args_) \
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 EXPAND extra_args_); \
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; \
}
#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__
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