зеркало из https://github.com/mozilla/gecko-dev.git
986 строки
33 KiB
C++
986 строки
33 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsIContent_h___
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#define nsIContent_h___
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#include "mozilla/Attributes.h"
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#include "mozilla/dom/BorrowedAttrInfo.h"
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#include "nsCaseTreatment.h" // for enum, cannot be forward-declared
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#include "nsINode.h"
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#include "nsStringFwd.h"
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#include "nsISupportsImpl.h"
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// Forward declarations
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class nsAtom;
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class nsIURI;
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class nsAttrValue;
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class nsAttrName;
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class nsTextFragment;
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class nsIFrame;
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class nsXBLBinding;
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class nsITextControlElement;
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namespace mozilla {
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class EventChainPreVisitor;
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struct URLExtraData;
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namespace dom {
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class ShadowRoot;
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class HTMLSlotElement;
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} // namespace dom
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namespace widget {
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struct IMEState;
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} // namespace widget
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} // namespace mozilla
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enum nsLinkState {
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eLinkState_Unvisited = 1,
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eLinkState_Visited = 2,
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eLinkState_NotLink = 3
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};
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// IID for the nsIContent interface
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// Must be kept in sync with xpcom/rust/xpcom/src/interfaces/nonidl.rs
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#define NS_ICONTENT_IID \
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{ 0x8e1bab9d, 0x8815, 0x4d2c, \
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{ 0xa2, 0x4d, 0x7a, 0xba, 0x52, 0x39, 0xdc, 0x22 } }
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/**
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* A node of content in a document's content model. This interface
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* is supported by all content objects.
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*/
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class nsIContent : public nsINode {
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public:
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typedef mozilla::widget::IMEState IMEState;
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#ifdef MOZILLA_INTERNAL_API
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// If you're using the external API, the only thing you can know about
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// nsIContent is that it exists with an IID
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explicit nsIContent(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
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: nsINode(aNodeInfo)
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{
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MOZ_ASSERT(mNodeInfo);
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SetNodeIsContent();
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}
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#endif // MOZILLA_INTERNAL_API
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_ICONTENT_IID)
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_CLASS(nsIContent)
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/**
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* Bind this content node to a tree. If this method throws, the caller must
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* call UnbindFromTree() on the node. In the typical case of a node being
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* appended to a parent, this will be called after the node has been added to
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* the parent's child list and before nsIDocumentObserver notifications for
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* the addition are dispatched.
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* @param aDocument The new document for the content node. May not be null
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* if aParent is null. Must match the current document of
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* aParent, if aParent is not null (note that
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* aParent->GetUncomposedDoc() can be null, in which case
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* this must also be null).
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* @param aParent The new parent for the content node. May be null if the
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* node is being bound as a direct child of the document.
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* @param aBindingParent The new binding parent for the content node.
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* This is must either be non-null if a particular
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* binding parent is desired or match aParent's binding
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* parent.
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* @param aCompileEventHandlers whether to initialize the event handlers in
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* the document (used by nsXULElement)
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* @note either aDocument or aParent must be non-null. If both are null,
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* this method _will_ crash.
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* @note This method must not be called by consumers of nsIContent on a node
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* that is already bound to a tree. Call UnbindFromTree first.
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* @note This method will handle rebinding descendants appropriately (eg
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* changing their binding parent as needed).
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* @note This method does not add the content node to aParent's child list
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* @throws NS_ERROR_OUT_OF_MEMORY if that happens
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*/
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virtual nsresult BindToTree(nsIDocument* aDocument, nsIContent* aParent,
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nsIContent* aBindingParent,
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bool aCompileEventHandlers) = 0;
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/**
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* Unbind this content node from a tree. This will set its current document
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* and binding parent to null. In the typical case of a node being removed
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* from a parent, this will be called after it has been removed from the
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* parent's child list and after the nsIDocumentObserver notifications for
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* the removal have been dispatched.
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* @param aDeep Whether to recursively unbind the entire subtree rooted at
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* this node. The only time false should be passed is when the
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* parent node of the content is being destroyed.
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* @param aNullParent Whether to null out the parent pointer as well. This
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* is usually desirable. This argument should only be false while
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* recursively calling UnbindFromTree when a subtree is detached.
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* @note This method is safe to call on nodes that are not bound to a tree.
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*/
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virtual void UnbindFromTree(bool aDeep = true,
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bool aNullParent = true) = 0;
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enum {
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/**
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* All XBL flattened tree children of the node, as well as :before and
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* :after anonymous content and native anonymous children.
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*
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* @note the result children order is
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* 1. :before generated node
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* 2. XBL flattened tree children of this node
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* 3. native anonymous nodes
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* 4. :after generated node
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*/
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eAllChildren = 0,
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/**
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* All XBL explicit children of the node (see
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* http://www.w3.org/TR/xbl/#explicit3 ), as well as :before and :after
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* anonymous content and native anonymous children.
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*
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* @note the result children order is
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* 1. :before generated node
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* 2. XBL explicit children of the node
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* 3. native anonymous nodes
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* 4. :after generated node
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*/
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eAllButXBL = 1,
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/**
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* Skip native anonymous content created for placeholder of HTML input,
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* used in conjunction with eAllChildren or eAllButXBL.
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*/
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eSkipPlaceholderContent = 2,
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/**
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* Skip native anonymous content created by ancestor frames of the root
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* element's primary frame, such as scrollbar elements created by the root
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* scroll frame.
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*/
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eSkipDocumentLevelNativeAnonymousContent = 4,
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};
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/**
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* Return either the XBL explicit children of the node or the XBL flattened
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* tree children of the node, depending on the filter, as well as
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* native anonymous children.
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*
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* @note calling this method with eAllButXBL will return children that are
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* also in the eAllButXBL and eAllChildren child lists of other descendants
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* of this node in the tree, but those other nodes cannot be reached from the
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* eAllButXBL child list.
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*/
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virtual already_AddRefed<nsINodeList> GetChildren(uint32_t aFilter) = 0;
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/**
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* Get whether this content is C++-generated anonymous content
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* @see nsIAnonymousContentCreator
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* @return whether this content is anonymous
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*/
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bool IsRootOfNativeAnonymousSubtree() const
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{
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NS_ASSERTION(!HasFlag(NODE_IS_NATIVE_ANONYMOUS_ROOT) ||
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(HasFlag(NODE_IS_ANONYMOUS_ROOT) &&
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HasFlag(NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE)),
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"Some flags seem to be missing!");
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return HasFlag(NODE_IS_NATIVE_ANONYMOUS_ROOT);
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}
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bool IsRootOfChromeAccessOnlySubtree() const
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{
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return HasFlag(NODE_IS_NATIVE_ANONYMOUS_ROOT |
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NODE_IS_ROOT_OF_CHROME_ONLY_ACCESS);
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}
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/**
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* Makes this content anonymous
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* @see nsIAnonymousContentCreator
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*/
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void SetIsNativeAnonymousRoot()
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{
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SetFlags(NODE_IS_ANONYMOUS_ROOT | NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE |
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NODE_IS_NATIVE_ANONYMOUS_ROOT | NODE_IS_NATIVE_ANONYMOUS);
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}
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/**
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* Returns |this| if it is not chrome-only/native anonymous, otherwise
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* first non chrome-only/native anonymous ancestor.
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*/
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nsIContent* FindFirstNonChromeOnlyAccessContent() const;
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/**
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* Returns true if and only if this node has a parent, but is not in
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* its parent's child list.
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*/
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bool IsRootOfAnonymousSubtree() const
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{
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NS_ASSERTION(!IsRootOfNativeAnonymousSubtree() ||
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(GetParent() && GetBindingParent() == GetParent()),
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"root of native anonymous subtree must have parent equal "
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"to binding parent");
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NS_ASSERTION(!GetParent() ||
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((GetBindingParent() == GetParent()) ==
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HasFlag(NODE_IS_ANONYMOUS_ROOT)) ||
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// Unfortunately default content for XBL insertion points is
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// anonymous content that is bound with the parent of the
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// insertion point as the parent but the bound element for the
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// binding as the binding parent. So we have to complicate
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// the assert a bit here.
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(GetBindingParent() &&
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(GetBindingParent() == GetParent()->GetBindingParent()) ==
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HasFlag(NODE_IS_ANONYMOUS_ROOT)),
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"For nodes with parent, flag and GetBindingParent() check "
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"should match");
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return HasFlag(NODE_IS_ANONYMOUS_ROOT);
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}
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/**
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* Returns true if there is NOT a path through child lists
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* from the top of this node's parent chain back to this node or
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* if the node is in native anonymous subtree without a parent.
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*/
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inline bool IsInAnonymousSubtree() const;
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/**
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* Return true iff this node is in an HTML document (in the HTML5 sense of
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* the term, i.e. not in an XHTML/XML document).
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*/
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inline bool IsInHTMLDocument() const;
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/**
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* Returns true if in a chrome document
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*/
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inline bool IsInChromeDocument() const;
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/**
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* Get the namespace that this element's tag is defined in
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* @return the namespace
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*/
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inline int32_t GetNameSpaceID() const
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{
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return mNodeInfo->NamespaceID();
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}
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inline bool IsHTMLElement() const
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{
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return IsInNamespace(kNameSpaceID_XHTML);
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}
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inline bool IsHTMLElement(nsAtom* aTag) const
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{
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return mNodeInfo->Equals(aTag, kNameSpaceID_XHTML);
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}
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template<typename First, typename... Args>
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inline bool IsAnyOfHTMLElements(First aFirst, Args... aArgs) const
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{
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return IsHTMLElement() && IsNodeInternal(aFirst, aArgs...);
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}
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inline bool IsSVGElement() const
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{
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return IsInNamespace(kNameSpaceID_SVG);
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}
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inline bool IsSVGElement(nsAtom* aTag) const
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{
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return mNodeInfo->Equals(aTag, kNameSpaceID_SVG);
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}
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template<typename First, typename... Args>
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inline bool IsAnyOfSVGElements(First aFirst, Args... aArgs) const
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{
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return IsSVGElement() && IsNodeInternal(aFirst, aArgs...);
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}
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inline bool IsXULElement() const
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{
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return IsInNamespace(kNameSpaceID_XUL);
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}
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inline bool IsXULElement(nsAtom* aTag) const
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{
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return mNodeInfo->Equals(aTag, kNameSpaceID_XUL);
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}
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template<typename First, typename... Args>
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inline bool IsAnyOfXULElements(First aFirst, Args... aArgs) const
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{
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return IsXULElement() && IsNodeInternal(aFirst, aArgs...);
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}
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inline bool IsMathMLElement() const
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{
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return IsInNamespace(kNameSpaceID_MathML);
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}
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inline bool IsMathMLElement(nsAtom* aTag) const
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{
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return mNodeInfo->Equals(aTag, kNameSpaceID_MathML);
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}
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template<typename First, typename... Args>
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inline bool IsAnyOfMathMLElements(First aFirst, Args... aArgs) const
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{
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return IsMathMLElement() && IsNodeInternal(aFirst, aArgs...);
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}
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inline bool IsActiveChildrenElement() const;
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bool IsGeneratedContentContainerForBefore() const
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{
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return IsRootOfNativeAnonymousSubtree() &&
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mNodeInfo->NameAtom() == nsGkAtoms::mozgeneratedcontentbefore;
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}
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bool IsGeneratedContentContainerForAfter() const
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{
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return IsRootOfNativeAnonymousSubtree() &&
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mNodeInfo->NameAtom() == nsGkAtoms::mozgeneratedcontentafter;
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}
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/**
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* Get direct access (but read only) to the text in the text content.
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* NOTE: For elements this is *not* the concatenation of all text children,
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* it is simply null;
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*/
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virtual const nsTextFragment *GetText() = 0;
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/**
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* Get the length of the text content.
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* NOTE: This should not be called on elements.
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*/
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virtual uint32_t TextLength() const = 0;
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/**
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* Determines if an event attribute name (such as onclick) is valid for
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* a given element type.
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* @note calls nsContentUtils::IsEventAttributeName with right flag
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* @note *Internal is overridden by subclasses as needed
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* @param aName the event name to look up
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*/
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bool IsEventAttributeName(nsAtom* aName);
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virtual bool IsEventAttributeNameInternal(nsAtom* aName)
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{
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return false;
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}
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/**
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* Query method to see if the frame is nothing but whitespace
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* NOTE: Always returns false for elements
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*/
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virtual bool TextIsOnlyWhitespace() = 0;
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/**
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* Thread-safe version of TextIsOnlyWhitespace.
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*/
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virtual bool ThreadSafeTextIsOnlyWhitespace() const = 0;
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/**
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* Check if this content is focusable and in the current tab order.
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* Note: most callers should use nsIFrame::IsFocusable() instead as it
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* checks visibility and other layout factors as well.
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* Tabbable is indicated by a nonnegative tabindex & is a subset of focusable.
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* For example, only the selected radio button in a group is in the
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* tab order, unless the radio group has no selection in which case
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* all of the visible, non-disabled radio buttons in the group are
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* in the tab order. On the other hand, all of the visible, non-disabled
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* radio buttons are always focusable via clicking or script.
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* Also, depending on either the accessibility.tabfocus pref or
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* a system setting (nowadays: Full keyboard access, mac only)
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* some widgets may be focusable but removed from the tab order.
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* @param [inout, optional] aTabIndex the computed tab index
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* In: default tabindex for element (-1 nonfocusable, == 0 focusable)
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* Out: computed tabindex
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* @param [optional] aTabIndex the computed tab index
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* < 0 if not tabbable
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* == 0 if in normal tab order
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* > 0 can be tabbed to in the order specified by this value
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* @return whether the content is focusable via mouse, kbd or script.
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*/
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bool IsFocusable(int32_t* aTabIndex = nullptr, bool aWithMouse = false);
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virtual bool IsFocusableInternal(int32_t* aTabIndex, bool aWithMouse);
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/**
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* The method focuses (or activates) element that accesskey is bound to. It is
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* called when accesskey is activated.
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*
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* @param aKeyCausesActivation - if true then element should be activated
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* @param aIsTrustedEvent - if true then event that is cause of accesskey
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* execution is trusted.
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* @return true if the focus was changed.
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*/
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virtual bool PerformAccesskey(bool aKeyCausesActivation,
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bool aIsTrustedEvent)
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{
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return false;
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}
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/*
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* Get desired IME state for the content.
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*
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* @return The desired IME status for the content.
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* This is a combination of an IME enabled value and
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* an IME open value of widget::IMEState.
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* If you return DISABLED, you should not set the OPEN and CLOSE
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* value.
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* PASSWORD should be returned only from password editor, this value
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* has a special meaning. It is used as alternative of DISABLED.
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* PLUGIN should be returned only when plug-in has focus. When a
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* plug-in is focused content, we should send native events directly.
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* Because we don't process some native events, but they may be needed
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* by the plug-in.
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*/
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virtual IMEState GetDesiredIMEState();
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/**
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* Gets content node with the binding (or native code, possibly on the
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* frame) responsible for our construction (and existence). Used by
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* anonymous content (both XBL-generated and native-anonymous).
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*
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* null for all explicit content (i.e., content reachable from the top
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* of its GetParent() chain via child lists).
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*
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* @return the binding parent
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*/
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virtual nsIContent* GetBindingParent() const
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{
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const nsExtendedContentSlots* slots = GetExistingExtendedContentSlots();
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return slots ? slots->mBindingParent : nullptr;
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}
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/**
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* Gets the current XBL binding that is bound to this element.
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*
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* @return the current binding.
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*/
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nsXBLBinding* GetXBLBinding() const
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{
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if (!HasFlag(NODE_MAY_BE_IN_BINDING_MNGR)) {
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return nullptr;
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}
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return DoGetXBLBinding();
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}
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virtual nsXBLBinding* DoGetXBLBinding() const = 0;
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/**
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* Gets the ShadowRoot binding for this element.
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*
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* @return The ShadowRoot currently bound to this element.
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*/
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inline mozilla::dom::ShadowRoot* GetShadowRoot() const;
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/**
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* Gets the root of the node tree for this content if it is in a shadow tree.
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* This method is called |GetContainingShadow| instead of |GetRootShadowRoot|
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* to avoid confusion with |GetShadowRoot|.
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*
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* @return The ShadowRoot that is the root of the node tree.
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*/
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mozilla::dom::ShadowRoot* GetContainingShadow() const
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{
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const nsExtendedContentSlots* slots = GetExistingExtendedContentSlots();
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return slots ? slots->mContainingShadow.get() : nullptr;
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}
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/**
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* Gets the shadow host if this content is in a shadow tree. That is, the host
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* of |GetContainingShadow|, if its not null.
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*
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* @return The shadow host, if this is in shadow tree, or null.
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*/
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nsIContent* GetContainingShadowHost() const;
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/**
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* Gets the assigned slot associated with this content.
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*
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* @return The assigned slot element or null.
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*/
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mozilla::dom::HTMLSlotElement* GetAssignedSlot() const
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{
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const nsExtendedContentSlots* slots = GetExistingExtendedContentSlots();
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|
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;
|
|
|
|
nsIContent* GetXBLInsertionParent() const
|
|
{
|
|
nsIContent* ip = GetXBLInsertionPoint();
|
|
return ip ? ip->GetParent() : nullptr;
|
|
}
|
|
|
|
/**
|
|
* Gets the insertion parent element of the XBL binding.
|
|
* The insertion parent is our one true parent in the transformed DOM.
|
|
*
|
|
* @return the insertion parent element.
|
|
*/
|
|
nsIContent* GetXBLInsertionPoint() const
|
|
{
|
|
const nsExtendedContentSlots* slots = GetExistingExtendedContentSlots();
|
|
return slots ? slots->mXBLInsertionPoint.get() : nullptr;
|
|
}
|
|
|
|
/**
|
|
* Sets the insertion parent element of the XBL binding.
|
|
*
|
|
* @param aContent The insertion parent element.
|
|
*/
|
|
void SetXBLInsertionPoint(nsIContent* aContent);
|
|
|
|
/**
|
|
* Same as GetFlattenedTreeParentNode, but returns null if the parent is
|
|
* non-nsIContent.
|
|
*/
|
|
inline nsIContent* GetFlattenedTreeParent() const;
|
|
|
|
/**
|
|
* 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 currently only called for input and button, in the HTML
|
|
* content sink. If you want to call it on your element, modify the content
|
|
* sink of your choice to do so. 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 currently only called for textarea, select, and object
|
|
* elements in the HTML content sink. If you want to call it on your element,
|
|
* modify the content sink of your choice to do so. 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;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
// 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();
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
// Returns true if this element is native-anonymous scrollbar content.
|
|
bool IsNativeScrollbarContent() const {
|
|
return IsNativeAnonymous() &&
|
|
IsAnyOfXULElements(nsGkAtoms::scrollbar,
|
|
nsGkAtoms::resizer,
|
|
nsGkAtoms::scrollcorner);
|
|
}
|
|
|
|
// Overloaded from nsINode
|
|
virtual already_AddRefed<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 Traverse(nsCycleCollectionTraversalCallback&);
|
|
virtual void Unlink();
|
|
|
|
/**
|
|
* The nearest enclosing content node with a binding that created us.
|
|
* TODO(emilio): This should be an Element*.
|
|
*
|
|
* @see nsIContent::GetBindingParent
|
|
*/
|
|
nsIContent* mBindingParent; // [Weak]
|
|
|
|
/**
|
|
* @see nsIContent::GetXBLInsertionPoint
|
|
*/
|
|
nsCOMPtr<nsIContent> mXBLInsertionPoint;
|
|
|
|
/**
|
|
* @see nsIContent::GetContainingShadow
|
|
*/
|
|
RefPtr<mozilla::dom::ShadowRoot> mContainingShadow;
|
|
|
|
/**
|
|
* @see nsIContent::GetAssignedSlot
|
|
*/
|
|
RefPtr<mozilla::dom::HTMLSlotElement> mAssignedSlot;
|
|
};
|
|
|
|
class nsContentSlots : public nsINode::nsSlots
|
|
{
|
|
public:
|
|
void Traverse(nsCycleCollectionTraversalCallback& aCb) override
|
|
{
|
|
nsINode::nsSlots::Traverse(aCb);
|
|
if (mExtendedSlots) {
|
|
mExtendedSlots->Traverse(aCb);
|
|
}
|
|
}
|
|
|
|
void Unlink() override
|
|
{
|
|
nsINode::nsSlots::Unlink();
|
|
if (mExtendedSlots) {
|
|
mExtendedSlots->Unlink();
|
|
}
|
|
}
|
|
|
|
mozilla::UniquePtr<nsExtendedContentSlots> 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->mExtendedSlots.get() : nullptr;
|
|
}
|
|
|
|
nsExtendedContentSlots* GetExistingExtendedContentSlots()
|
|
{
|
|
nsContentSlots* slots = GetExistingContentSlots();
|
|
return slots ? slots->mExtendedSlots.get() : nullptr;
|
|
}
|
|
|
|
nsExtendedContentSlots* ExtendedContentSlots()
|
|
{
|
|
nsContentSlots* slots = ContentSlots();
|
|
if (!slots->mExtendedSlots) {
|
|
slots->mExtendedSlots.reset(CreateExtendedSlots());
|
|
}
|
|
return slots->mExtendedSlots.get();
|
|
}
|
|
|
|
/**
|
|
* Hook for implementing GetID. This is guaranteed to only be
|
|
* called if HasID() is true.
|
|
*/
|
|
nsAtom* DoGetID() const;
|
|
|
|
~nsIContent() {}
|
|
|
|
public:
|
|
#ifdef DEBUG
|
|
/**
|
|
* 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)
|
|
|
|
inline nsIContent* nsINode::AsContent()
|
|
{
|
|
MOZ_ASSERT(IsContent());
|
|
return static_cast<nsIContent*>(this);
|
|
}
|
|
|
|
inline const nsIContent* nsINode::AsContent() const
|
|
{
|
|
return const_cast<nsINode*>(this)->AsContent();
|
|
}
|
|
|
|
// Some checks are faster to do on nsIContent or Element than on
|
|
// nsINode, so spit out FromNode versions taking those types too.
|
|
#define NS_IMPL_FROMNODE_HELPER(_class, _check) \
|
|
template<typename ArgType> \
|
|
static _class* FromNode(ArgType&& aNode) \
|
|
{ \
|
|
/* We need the double-cast in case aNode is a smartptr. Those */ \
|
|
/* can cast to superclasses of the type they're templated on, */ \
|
|
/* but not directly to subclasses. */ \
|
|
return aNode->_check ? \
|
|
static_cast<_class*>(static_cast<nsINode*>(aNode)) : nullptr; \
|
|
} \
|
|
template<typename ArgType> \
|
|
static _class* FromNodeOrNull(ArgType&& aNode) \
|
|
{ \
|
|
return aNode ? FromNode(aNode) : nullptr; \
|
|
} \
|
|
template<typename ArgType> \
|
|
static const _class* FromNode(const ArgType* aNode) \
|
|
{ \
|
|
return aNode->_check ? static_cast<const _class*>(aNode) : nullptr; \
|
|
} \
|
|
template<typename ArgType> \
|
|
static const _class* FromNodeOrNull(const ArgType* aNode) \
|
|
{ \
|
|
return aNode ? FromNode(aNode) : nullptr; \
|
|
}
|
|
|
|
#define NS_IMPL_FROMNODE(_class, _nsid) \
|
|
NS_IMPL_FROMNODE_HELPER(_class, IsInNamespace(_nsid))
|
|
|
|
#define NS_IMPL_FROMNODE_WITH_TAG(_class, _nsid, _tag) \
|
|
NS_IMPL_FROMNODE_HELPER(_class, NodeInfo()->Equals(nsGkAtoms::_tag, _nsid))
|
|
|
|
#define NS_IMPL_FROMNODE_HTML_WITH_TAG(_class, _tag) \
|
|
NS_IMPL_FROMNODE_WITH_TAG(_class, kNameSpaceID_XHTML, _tag)
|
|
|
|
#endif /* nsIContent_h___ */
|