nsIContent.h
/* -*- 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/. */
#ifndef nsIContent_h___
#define nsIContent_h___
#include "mozilla/FlushType.h"
#include "nsINode.h"
#include "nsStringFwd.h"
// Forward declarations
class nsIURI;
class nsTextFragment;
class nsIFrame;
namespace mozilla {
class EventChainPreVisitor;
struct URLExtraData;
namespace dom {
struct BindContext;
class ShadowRoot;
class HTMLSlotElement;
} // namespace dom
namespace widget {
enum class IMEEnabled;
struct IMEState;
} // namespace widget
} // namespace mozilla
// IID for the nsIContent interface
// Must be kept in sync with xpcom/rust/xpcom/src/interfaces/nonidl.rs
#define NS_ICONTENT_IID \
{ \
0x8e1bab9d, 0x8815, 0x4d2c, { \
0xa2, 0x4d, 0x7a, 0xba, 0x52, 0x39, 0xdc, 0x22 \
} \
}
/**
* A node of content in a document's content model. This interface
* is supported by all content objects.
*/
class nsIContent : public nsINode {
public:
using IMEEnabled = mozilla::widget::IMEEnabled;
using IMEState = mozilla::widget::IMEState;
using BindContext = mozilla::dom::BindContext;
void ConstructUbiNode(void* storage) override;
#ifdef MOZILLA_INTERNAL_API
// If you're using the external API, the only thing you can know about
// nsIContent is that it exists with an IID
explicit nsIContent(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
: nsINode(std::move(aNodeInfo)) {
MOZ_ASSERT(mNodeInfo);
MOZ_ASSERT(static_cast<nsINode*>(this) == reinterpret_cast<nsINode*>(this));
SetNodeIsContent();
}
#endif // MOZILLA_INTERNAL_API
NS_DECLARE_STATIC_IID_ACCESSOR(NS_ICONTENT_IID)
NS_DECL_CYCLE_COLLECTING_ISUPPORTS_FINAL_DELETECYCLECOLLECTABLE
NS_DECL_CYCLE_COLLECTION_CLASS(nsIContent)
NS_DECL_DOMARENA_DESTROY
NS_IMPL_FROMNODE_HELPER(nsIContent, IsContent())
/**
* Bind this content node to a tree. If this method throws, the caller must
* call UnbindFromTree() on the node. In the typical case of a node being
* appended to a parent, this will be called after the node has been added to
* the parent's child list and before nsIDocumentObserver notifications for
* the addition are dispatched.
* BindContext propagates various information down the subtree; see its
* documentation to know how to set it up.
* @param aParent The new parent node for the content node. May be a document.
* @note This method must not be called by consumers of nsIContent on a node
* that is already bound to a tree. Call UnbindFromTree first.
* @note This method will handle rebinding descendants appropriately (eg
* changing their binding parent as needed).
* @note This method does not add the content node to aParent's child list
* @throws NS_ERROR_OUT_OF_MEMORY if that happens
*
* TODO(emilio): Should we move to nsIContent::BindToTree most of the
* FragmentOrElement / CharacterData duplicated code?
*/
virtual nsresult BindToTree(BindContext&, nsINode& aParent) = 0;
/**
* Unbind this content node from a tree. This will set its current document
* and binding parent to null. In the typical case of a node being removed
* from a parent, this will be called after it has been removed from the
* parent's child list and after the nsIDocumentObserver notifications for
* the removal have been dispatched.
* @param aDeep Whether to recursively unbind the entire subtree rooted at
* this node. The only time false should be passed is when the
* parent node of the content is being destroyed.
* @param aNullParent Whether to null out the parent pointer as well. This
* is usually desirable. This argument should only be false while
* recursively calling UnbindFromTree when a subtree is detached.
* @note This method is safe to call on nodes that are not bound to a tree.
*/
virtual void UnbindFromTree(bool aNullParent = true) = 0;
enum {
/**
* All XBL flattened tree children of the node, as well as :before and
* :after anonymous content and native anonymous children.
*
* @note the result children order is
* 1. :before generated node
* 2. XBL flattened tree children of this node
* 3. native anonymous nodes
* 4. :after generated node
*/
eAllChildren = 0,
/**
* All XBL explicit children of the node (see
* http://www.w3.org/TR/xbl/#explicit3 ), as well as :before and :after
* anonymous content and native anonymous children.
*
* @note the result children order is
* 1. :before generated node
* 2. XBL explicit children of the node
* 3. native anonymous nodes
* 4. :after generated node
*/
eAllButXBL = 1,
/**
* Skip native anonymous content created for placeholder of HTML input,
* used in conjunction with eAllChildren or eAllButXBL.
*/
eSkipPlaceholderContent = 2,
/**
* Skip native anonymous content created by ancestor frames of the root
* element's primary frame, such as scrollbar elements created by the root
* scroll frame.
*/
eSkipDocumentLevelNativeAnonymousContent = 4,
};
/**
* Return either the XBL explicit children of the node or the XBL flattened
* tree children of the node, depending on the filter, as well as
* native anonymous children.
*
* @note calling this method with eAllButXBL will return children that are
* also in the eAllButXBL and eAllChildren child lists of other descendants
* of this node in the tree, but those other nodes cannot be reached from the
* eAllButXBL child list.
*/
virtual already_AddRefed<nsINodeList> GetChildren(uint32_t aFilter) = 0;
/**
* Makes this content anonymous
* @see nsIAnonymousContentCreator
*/
void SetIsNativeAnonymousRoot() {
SetFlags(NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE |
NODE_IS_NATIVE_ANONYMOUS_ROOT);
}
/**
* Returns |this| if it is not chrome-only/native anonymous, otherwise
* first non chrome-only/native anonymous ancestor.
*/
nsIContent* FindFirstNonChromeOnlyAccessContent() const;
/**
* Return true iff this node is in an HTML document (in the HTML5 sense of
* the term, i.e. not in an XHTML/XML document).
*/
inline bool IsInHTMLDocument() const;
/**
* Returns true if in a chrome document
*/
inline bool IsInChromeDocument() const;
/**
* Get the namespace that this element's tag is defined in
* @return the namespace
*/
inline int32_t GetNameSpaceID() const { return mNodeInfo->NamespaceID(); }
inline bool IsHTMLElement() const {
return IsInNamespace(kNameSpaceID_XHTML);
}
inline bool IsHTMLElement(const nsAtom* aTag) const {
return mNodeInfo->Equals(aTag, kNameSpaceID_XHTML);
}
template <typename First, typename... Args>
inline bool IsAnyOfHTMLElements(First aFirst, Args... aArgs) const {
return IsHTMLElement() && IsNodeInternal(aFirst, aArgs...);
}
inline bool IsSVGElement() const { return IsInNamespace(kNameSpaceID_SVG); }
inline bool IsSVGElement(const nsAtom* aTag) const {
return mNodeInfo->Equals(aTag, kNameSpaceID_SVG);
}
template <typename First, typename... Args>
inline bool IsAnyOfSVGElements(First aFirst, Args... aArgs) const {
return IsSVGElement() && IsNodeInternal(aFirst, aArgs...);
}
inline bool IsXULElement() const { return IsInNamespace(kNameSpaceID_XUL); }
inline bool IsXULElement(const nsAtom* aTag) const {
return mNodeInfo->Equals(aTag, kNameSpaceID_XUL);
}
template <typename First, typename... Args>
inline bool IsAnyOfXULElements(First aFirst, Args... aArgs) const {
return IsXULElement() && IsNodeInternal(aFirst, aArgs...);
}
inline bool IsMathMLElement() const {
return IsInNamespace(kNameSpaceID_MathML);
}
inline bool IsMathMLElement(const nsAtom* aTag) const {
return mNodeInfo->Equals(aTag, kNameSpaceID_MathML);
}
template <typename First, typename... Args>
inline bool IsAnyOfMathMLElements(First aFirst, Args... aArgs) const {
return IsMathMLElement() && IsNodeInternal(aFirst, aArgs...);
}
bool IsGeneratedContentContainerForBefore() const {
return IsRootOfNativeAnonymousSubtree() &&
mNodeInfo->NameAtom() == nsGkAtoms::mozgeneratedcontentbefore;
}
bool IsGeneratedContentContainerForAfter() const {
return IsRootOfNativeAnonymousSubtree() &&
mNodeInfo->NameAtom() == nsGkAtoms::mozgeneratedcontentafter;
}
bool IsGeneratedContentContainerForMarker() const {
return IsRootOfNativeAnonymousSubtree() &&
mNodeInfo->NameAtom() == nsGkAtoms::mozgeneratedcontentmarker;
}
/**
* Get direct access (but read only) to the text in the text content.
* NOTE: For elements this is *not* the concatenation of all text children,
* it is simply null;
*/
virtual const nsTextFragment* GetText() = 0;
/**
* Get the length of the text content.
* NOTE: This should not be called on elements.
*/
virtual uint32_t TextLength() const = 0;
/**
* Determines if an event attribute name (such as onclick) is valid for
* a given element type.
* @note calls nsContentUtils::IsEventAttributeName with right flag
* @note *Internal is overridden by subclasses as needed
* @param aName the event name to look up
*/
bool IsEventAttributeName(nsAtom* aName);
virtual bool IsEventAttributeNameInternal(nsAtom* aName) { return false; }
/**
* Query method to see if the frame is nothing but whitespace
* NOTE: Always returns false for elements
*/
virtual bool TextIsOnlyWhitespace() = 0;
/**
* Thread-safe version of TextIsOnlyWhitespace.
*/
virtual bool ThreadSafeTextIsOnlyWhitespace() const = 0;
/**
* Check if this content is focusable and in the current tab order.
* Note: most callers should use nsIFrame::IsFocusable() instead as it
* checks visibility and other layout factors as well.
* Tabbable is indicated by a nonnegative tabindex & is a subset of focusable.
* For example, only the selected radio button in a group is in the
* tab order, unless the radio group has no selection in which case
* all of the visible, non-disabled radio buttons in the group are
* in the tab order. On the other hand, all of the visible, non-disabled
* radio buttons are always focusable via clicking or script.
* Also, depending on either the accessibility.tabfocus pref or
* a system setting (nowadays: Full keyboard access, mac only)
* some widgets may be focusable but removed from the tab order.
* @param [inout, optional] aTabIndex the computed tab index
* In: default tabindex for element (-1 nonfocusable, == 0 focusable)
* Out: computed tabindex
* @param [optional] aTabIndex the computed tab index
* < 0 if not tabbable
* == 0 if in normal tab order
* > 0 can be tabbed to in the order specified by this value
* @return whether the content is focusable via mouse, kbd or script.
*/
bool IsFocusable(int32_t* aTabIndex = nullptr, bool aWithMouse = false);
virtual bool IsFocusableInternal(int32_t* aTabIndex, bool aWithMouse);
/*
* Get desired IME state for the content.
*
* @return The desired IME status for the content.
* This is a combination of an IME enabled value and
* an IME open value of widget::IMEState.
* If you return IMEEnabled::Disabled, you should not set the OPEN
* nor CLOSE value.
* IMEEnabled::Password should be returned only from password editor,
* this value has a special meaning. It is used as alternative of
* IMEEnabled::Disabled. IMEENabled::Plugin should be returned only
* when plug-in has focus. When a plug-in is focused content, we
* should send native events directly. Because we don't process some
* native events, but they may be needed by the plug-in.
*/
virtual IMEState GetDesiredIMEState();
/**
* Gets the ShadowRoot binding for this element.
*
* @return The ShadowRoot currently bound to this element.
*/
inline mozilla::dom::ShadowRoot* GetShadowRoot() const;
/**
* Gets the root of the node tree for this content if it is in a shadow tree.
*
* @return The ShadowRoot that is the root of the node tree.
*/
mozilla::dom::ShadowRoot* GetContainingShadow() const {
const nsExtendedContentSlots* slots = GetExistingExtendedContentSlots();
return slots ? slots->mContainingShadow.get() : nullptr;
}
/**
* Gets the assigned slot associated with this content.
*
* @return The assigned slot element or null.
*/
mozilla::dom::HTMLSlotElement* GetAssignedSlot() const {
const nsExtendedContentSlots* slots = GetExistingExtendedContentSlots();
return slots ? slots->mAssignedSlot.get() : nullptr;
}
/**
* Sets the assigned slot associated with this content.
*
* @param aSlot The assigned slot.
*/
void SetAssignedSlot(mozilla::dom::HTMLSlotElement* aSlot);
/**
* Gets the assigned slot associated with this content based on parent's
* shadow root mode. Returns null if parent's shadow root is "closed".
* https://dom.spec.whatwg.org/#dom-slotable-assignedslot
*
* @return The assigned slot element or null.
*/
mozilla::dom::HTMLSlotElement* GetAssignedSlotByMode() const;
/**
* Same as GetFlattenedTreeParentNode, but returns null if the parent is
* non-nsIContent.
*/
inline nsIContent* GetFlattenedTreeParent() const;
protected:
// Handles getting inserted or removed directly under a <slot> element.
// This is meant to only be called from the two functions below.
inline void HandleInsertionToOrRemovalFromSlot();
// Handles Shadow-DOM-related state tracking. Meant to be called near the
// end of BindToTree(), only if the tree we're in actually changed, that is,
// after the subtree has been bound to the new parent.
inline void HandleShadowDOMRelatedInsertionSteps(bool aHadParent);
// Handles Shadow-DOM related state tracking. Meant to be called near the
// beginning of UnbindFromTree(), before the node has lost the reference to
// its parent.
inline void HandleShadowDOMRelatedRemovalSteps(bool aNullParent);
public:
/**
* API to check if this is a link that's traversed in response to user input
* (e.g. a click event). Specializations for HTML/SVG/generic XML allow for
* different types of link in different types of content.
*
* @param aURI Required out param. If this content is a link, a new nsIURI
* set to this link's URI will be passed out.
*
* @note The out param, aURI, is guaranteed to be set to a non-null pointer
* when the return value is true.
*
* XXXjwatt: IMO IsInteractiveLink would be a better name.
*/
virtual bool IsLink(nsIURI** aURI) const = 0;
/**
* Get a pointer to the full href URI (fully resolved and canonicalized,
* since it's an nsIURI object) for link elements.
*
* @return A pointer to the URI or null if the element is not a link or it
* has no HREF attribute.
*/
virtual already_AddRefed<nsIURI> GetHrefURI() const { return nullptr; }
/**
* This method is called when the parser finishes creating the element. This
* particularly means that it has done everything you would expect it to have
* done after it encounters the > at the end of the tag (for HTML or XML).
* This includes setting the attributes, setting the document / form, and
* placing the element into the tree at its proper place.
*
* For container elements, this is called *before* any of the children are
* created or added into the tree.
*
* NOTE: this is only called for elements listed in
* RequiresDoneCreatingElement. This is an efficiency measure.
*
* If you also need to determine whether the parser is the one creating your
* element (through createElement() or cloneNode() generally) then add a
* uint32_t aFromParser to the NS_NewXXX() constructor for your element and
* have the parser pass the appropriate flags. See HTMLInputElement.cpp and
* nsHTMLContentSink::MakeContentObject().
*
* DO NOT USE THIS METHOD to get around the fact that it's hard to deal with
* attributes dynamically. If you make attributes affect your element from
* this method, it will only happen on initialization and JavaScript will not
* be able to create elements (which requires them to first create the
* element and then call setAttribute() directly, at which point
* DoneCreatingElement() has already been called and is out of the picture).
*/
virtual void DoneCreatingElement() {}
/**
* This method is called when the parser finishes creating the element's
* children, if any are present.
*
* NOTE: this is only called for elements listed in
* RequiresDoneAddingChildren. This is an efficiency measure.
*
* If you also need to determine whether the parser is the one creating your
* element (through createElement() or cloneNode() generally) then add a
* boolean aFromParser to the NS_NewXXX() constructor for your element and
* have the parser pass true. See HTMLInputElement.cpp and
* nsHTMLContentSink::MakeContentObject().
*
* @param aHaveNotified Whether there has been a
* ContentInserted/ContentAppended notification for this content node
* yet.
*/
virtual void DoneAddingChildren(bool aHaveNotified) {}
/**
* For HTML textarea, select, and object elements, returns true if all
* children have been added OR if the element was not created by the parser.
* Returns true for all other elements.
*
* @returns false if the element was created by the parser and
* it is an HTML textarea, select, or object
* element and not all children have been added.
*
* @returns true otherwise.
*/
virtual bool IsDoneAddingChildren() { return true; }
/**
* Returns true if an element needs its DoneCreatingElement method to be
* called after it has been created.
* @see nsIContent::DoneCreatingElement
*
* @param aNamespaceID the node's namespace ID
* @param aName the node's tag name
*/
static inline bool RequiresDoneCreatingElement(int32_t aNamespace,
nsAtom* aName) {
if (aNamespace == kNameSpaceID_XHTML &&
(aName == nsGkAtoms::input || aName == nsGkAtoms::button ||
aName == nsGkAtoms::menuitem || aName == nsGkAtoms::audio ||
aName == nsGkAtoms::video)) {
MOZ_ASSERT(
!RequiresDoneAddingChildren(aNamespace, aName),
"Both DoneCreatingElement and DoneAddingChildren on a same element "
"isn't supported.");
return true;
}
return false;
}
/**
* Returns true if an element needs its DoneAddingChildren method to be
* called after all of its children have been added.
* @see nsIContent::DoneAddingChildren
*
* @param aNamespace the node's namespace ID
* @param aName the node's tag name
*/
static inline bool RequiresDoneAddingChildren(int32_t aNamespace,
nsAtom* aName) {
return (aNamespace == kNameSpaceID_XHTML &&
(aName == nsGkAtoms::select || aName == nsGkAtoms::textarea ||
aName == nsGkAtoms::head || aName == nsGkAtoms::title ||
aName == nsGkAtoms::object || aName == nsGkAtoms::output)) ||
(aNamespace == kNameSpaceID_SVG && aName == nsGkAtoms::title) ||
(aNamespace == kNameSpaceID_XUL && aName == nsGkAtoms::linkset);
}
/**
* Get the ID of this content node (the atom corresponding to the
* value of the id attribute). This may be null if there is no ID.
*/
nsAtom* GetID() const {
if (HasID()) {
return DoGetID();
}
return nullptr;
}
/**
* Should be called when the node can become editable or when it can stop
* being editable (for example when its contentEditable attribute changes,
* when it is moved into an editable parent, ...). If aNotify is true and
* the node is an element, this will notify the state change.
*/
virtual void UpdateEditableState(bool aNotify);
/**
* Destroy this node and its children. Ideally this shouldn't be needed
* but for now we need to do it to break cycles.
*/
virtual void DestroyContent() {}
/**
* Saves the form state of this node and its children.
*/
virtual void SaveSubtreeState() = 0;
/**
* Getter and setter for our primary frame pointer. This is the frame that
* is most closely associated with the content. A frame is more closely
* associated with the content than another frame if the one frame contains
* directly or indirectly the other frame (e.g., when a frame is scrolled
* there is a scroll frame that contains the frame being scrolled). This
* frame is always the first continuation.
*
* In the case of absolutely positioned elements and floated elements, this
* frame is the out of flow frame, not the placeholder.
*/
nsIFrame* GetPrimaryFrame() const {
return (IsInUncomposedDoc() || IsInShadowTree()) ? mPrimaryFrame : nullptr;
}
/**
* 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(mozilla::FlushType aType);
// Defined in nsIContentInlines.h because it needs nsIFrame.
inline void SetPrimaryFrame(nsIFrame* aFrame);
nsresult LookupNamespaceURIInternal(const nsAString& aNamespacePrefix,
nsAString& aNamespaceURI) const;
/**
* If this content has independent selection, e.g., if this is input field
* or textarea, this return TRUE. Otherwise, false.
*/
bool HasIndependentSelection() const;
/**
* If the content is a part of HTML editor, this returns editing
* host content. When the content is in designMode, this returns its body
* element. Also, when the content isn't editable, this returns null.
*/
mozilla::dom::Element* GetEditingHost();
bool SupportsLangAttr() const {
return IsHTMLElement() || IsSVGElement() || IsXULElement();
}
/**
* Determining language. Look at the nearest ancestor element that has a lang
* attribute in the XML namespace or is an HTML/SVG element and has a lang in
* no namespace attribute.
*
* Returns null if no language was specified. Can return the empty atom.
*/
nsAtom* GetLang() const;
bool GetLang(nsAString& aResult) const {
if (auto* lang = GetLang()) {
aResult.Assign(nsDependentAtomString(lang));
return true;
}
return false;
}
// Overloaded from nsINode
nsIURI* GetBaseURI(bool aTryUseXHRDocBaseURI = false) const override;
// Returns base URI for style attribute.
nsIURI* GetBaseURIForStyleAttr() const;
// Returns the URL data for style attribute.
// If aSubjectPrincipal is passed, it should be the scripted principal
// responsible for generating the URL data.
already_AddRefed<mozilla::URLExtraData> GetURLDataForStyleAttr(
nsIPrincipal* aSubjectPrincipal = nullptr) const;
void GetEventTargetParent(mozilla::EventChainPreVisitor& aVisitor) override;
bool IsPurple() const { return mRefCnt.IsPurple(); }
void RemovePurple() { mRefCnt.RemovePurple(); }
bool OwnedOnlyByTheDOMTree() {
uint32_t rc = mRefCnt.get();
if (GetParent()) {
--rc;
}
rc -= GetChildCount();
return rc == 0;
}
protected:
/**
* Lazily allocated extended slots to avoid
* that may only be instantiated when a content object is accessed
* through the DOM. Rather than burn actual slots in the content
* objects for each of these instance variables, we put them off
* in a side structure that's only allocated when the content is
* accessed through the DOM.
*/
class nsExtendedContentSlots {
public:
nsExtendedContentSlots();
virtual ~nsExtendedContentSlots();
virtual void TraverseExtendedSlots(nsCycleCollectionTraversalCallback&);
virtual void UnlinkExtendedSlots();
virtual size_t SizeOfExcludingThis(
mozilla::MallocSizeOf aMallocSizeOf) const;
/**
* @see nsIContent::GetContainingShadow
*/
RefPtr<mozilla::dom::ShadowRoot> mContainingShadow;
/**
* @see nsIContent::GetAssignedSlot
*/
RefPtr<mozilla::dom::HTMLSlotElement> mAssignedSlot;
};
class nsContentSlots : public nsINode::nsSlots {
public:
nsContentSlots() : nsINode::nsSlots(), mExtendedSlots(0) {}
~nsContentSlots() {
if (!(mExtendedSlots & sNonOwningExtendedSlotsFlag)) {
delete GetExtendedContentSlots();
}
}
void Traverse(nsCycleCollectionTraversalCallback& aCb) override {
nsINode::nsSlots::Traverse(aCb);
if (mExtendedSlots) {
GetExtendedContentSlots()->TraverseExtendedSlots(aCb);
}
}
void Unlink() override {
nsINode::nsSlots::Unlink();
if (mExtendedSlots) {
GetExtendedContentSlots()->UnlinkExtendedSlots();
}
}
void SetExtendedContentSlots(nsExtendedContentSlots* aSlots, bool aOwning) {
mExtendedSlots = reinterpret_cast<uintptr_t>(aSlots);
if (!aOwning) {
mExtendedSlots |= sNonOwningExtendedSlotsFlag;
}
}
// OwnsExtendedSlots returns true if we have no extended slots or if we
// have extended slots and own them.
bool OwnsExtendedSlots() const {
return !(mExtendedSlots & sNonOwningExtendedSlotsFlag);
}
nsExtendedContentSlots* GetExtendedContentSlots() const {
return reinterpret_cast<nsExtendedContentSlots*>(
mExtendedSlots & ~sNonOwningExtendedSlotsFlag);
}
private:
static const uintptr_t sNonOwningExtendedSlotsFlag = 1u;
uintptr_t mExtendedSlots;
};
// Override from nsINode
nsContentSlots* CreateSlots() override { return new nsContentSlots(); }
nsContentSlots* ContentSlots() {
return static_cast<nsContentSlots*>(Slots());
}
const nsContentSlots* GetExistingContentSlots() const {
return static_cast<nsContentSlots*>(GetExistingSlots());
}
nsContentSlots* GetExistingContentSlots() {
return static_cast<nsContentSlots*>(GetExistingSlots());
}
virtual nsExtendedContentSlots* CreateExtendedSlots() {
return new nsExtendedContentSlots();
}
const nsExtendedContentSlots* GetExistingExtendedContentSlots() const {
const nsContentSlots* slots = GetExistingContentSlots();
return slots ? slots->GetExtendedContentSlots() : nullptr;
}
nsExtendedContentSlots* GetExistingExtendedContentSlots() {
nsContentSlots* slots = GetExistingContentSlots();
return slots ? slots->GetExtendedContentSlots() : nullptr;
}
nsExtendedContentSlots* ExtendedContentSlots() {
nsContentSlots* slots = ContentSlots();
if (!slots->GetExtendedContentSlots()) {
slots->SetExtendedContentSlots(CreateExtendedSlots(), true);
}
return slots->GetExtendedContentSlots();
}
/**
* Hook for implementing GetID. This is guaranteed to only be
* called if HasID() is true.
*/
nsAtom* DoGetID() const;
~nsIContent() = default;
public:
#if defined(DEBUG) || defined(MOZ_DUMP_PAINTING)
# define MOZ_DOM_LIST
#endif
#ifdef MOZ_DOM_LIST
/**
* List the content (and anything it contains) out to the given
* file stream. Use aIndent as the base indent during formatting.
*/
virtual void List(FILE* out = stdout, int32_t aIndent = 0) const = 0;
/**
* Dump the content (and anything it contains) out to the given
* file stream. Use aIndent as the base indent during formatting.
*/
virtual void DumpContent(FILE* out = stdout, int32_t aIndent = 0,
bool aDumpAll = true) const = 0;
#endif
enum ETabFocusType {
eTabFocus_textControlsMask =
(1 << 0), // textboxes and lists always tabbable
eTabFocus_formElementsMask = (1 << 1), // non-text form elements
eTabFocus_linksMask = (1 << 2), // links
eTabFocus_any = 1 + (1 << 1) + (1 << 2) // everything that can be focused
};
// Tab focus model bit field:
static int32_t sTabFocusModel;
// accessibility.tabfocus_applies_to_xul pref - if it is set to true,
// the tabfocus bit field applies to xul elements.
static bool sTabFocusModelAppliesToXUL;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsIContent, NS_ICONTENT_IID)
#endif /* nsIContent_h___ */
