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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/. */
+
+#ifndef mozilla_dom_DocumentOrShadowRoot_h__
+#define mozilla_dom_DocumentOrShadowRoot_h__
+
+#include "mozilla/dom/NameSpaceConstants.h"
+#include "mozilla/IdentifierMapEntry.h"
+#include "mozilla/RelativeTo.h"
+#include "mozilla/ReverseIterator.h"
+#include "nsClassHashtable.h"
+#include "nsContentListDeclarations.h"
+#include "nsTArray.h"
+#include "nsTHashSet.h"
+#include "RadioGroupManager.h"
+
+class nsContentList;
+class nsCycleCollectionTraversalCallback;
+class nsINode;
+class nsINodeList;
+class nsIRadioVisitor;
+class nsWindowSizes;
+
+namespace mozilla {
+class ErrorResult;
+class StyleSheet;
+class ErrorResult;
+
+namespace dom {
+
+class Animation;
+class Element;
+class Document;
+class DocumentOrShadowRoot;
+class HTMLInputElement;
+class StyleSheetList;
+class ShadowRoot;
+template <typename T>
+class Sequence;
+
+/**
+ * A class meant to be shared by ShadowRoot and Document, that holds a list of
+ * stylesheets.
+ *
+ * TODO(emilio, bug 1418159): In the future this should hold most of the
+ * relevant style state, this should allow us to fix bug 548397.
+ */
+class DocumentOrShadowRoot : public RadioGroupManager {
+ enum class Kind {
+ Document,
+ ShadowRoot,
+ };
+
+ public:
+ // These should always be non-null, but can't use a reference because
+ // dereferencing `this` on initializer lists is UB, apparently, see
+ // bug 1596499.
+ explicit DocumentOrShadowRoot(Document*);
+ explicit DocumentOrShadowRoot(ShadowRoot*);
+
+ // Unusual argument naming is because of cycle collection macros.
+ static void Traverse(DocumentOrShadowRoot* tmp,
+ nsCycleCollectionTraversalCallback& cb);
+ static void Unlink(DocumentOrShadowRoot* tmp);
+
+ nsINode& AsNode() { return *mAsNode; }
+
+ const nsINode& AsNode() const { return *mAsNode; }
+
+ StyleSheet* SheetAt(size_t aIndex) const {
+ return mStyleSheets.SafeElementAt(aIndex);
+ }
+
+ size_t SheetCount() const { return mStyleSheets.Length(); }
+
+ const nsTArray<RefPtr<StyleSheet>>& AdoptedStyleSheets() const {
+ return mAdoptedStyleSheets;
+ }
+
+ /**
+ * Returns an index for the sheet in relative style order.
+ * If there are non-applicable sheets, then this index may
+ * not match 1:1 with the sheet's actual index in the style set.
+ *
+ * Handles sheets from both mStyleSheets and mAdoptedStyleSheets
+ */
+ int32_t StyleOrderIndexOfSheet(const StyleSheet& aSheet) const;
+
+ StyleSheetList* StyleSheets();
+
+ void RemoveStyleSheet(StyleSheet&);
+
+ Element* GetElementById(const nsAString& aElementId) const;
+ Element* GetElementById(nsAtom* aElementId) const;
+
+ /**
+ * This method returns _all_ the elements in this scope which have id
+ * aElementId, if there are any. Otherwise it returns null.
+ *
+ * This is useful for stuff like QuerySelector optimization and such.
+ */
+ inline const nsTArray<Element*>* GetAllElementsForId(
+ const nsAString& aElementId) const;
+
+ already_AddRefed<nsContentList> GetElementsByTagName(
+ const nsAString& aTagName) {
+ return NS_GetContentList(&AsNode(), kNameSpaceID_Unknown, aTagName);
+ }
+
+ already_AddRefed<nsContentList> GetElementsByTagNameNS(
+ const nsAString& aNamespaceURI, const nsAString& aLocalName);
+
+ already_AddRefed<nsContentList> GetElementsByTagNameNS(
+ const nsAString& aNamespaceURI, const nsAString& aLocalName,
+ mozilla::ErrorResult&);
+
+ already_AddRefed<nsContentList> GetElementsByClassName(
+ const nsAString& aClasses);
+
+ ~DocumentOrShadowRoot();
+
+ Element* GetPointerLockElement();
+ Element* GetFullscreenElement() const;
+
+ Element* ElementFromPoint(float aX, float aY);
+ nsINode* NodeFromPoint(float aX, float aY);
+
+ void ElementsFromPoint(float aX, float aY, nsTArray<RefPtr<Element>>&);
+ void NodesFromPoint(float aX, float aY, nsTArray<RefPtr<nsINode>>&);
+
+ /**
+ * Helper for elementFromPoint implementation that allows
+ * ignoring the scroll frame and/or avoiding layout flushes.
+ *
+ * @see nsIDOMWindowUtils::elementFromPoint
+ */
+ Element* ElementFromPointHelper(float aX, float aY,
+ bool aIgnoreRootScrollFrame,
+ bool aFlushLayout,
+ ViewportType aViewportType);
+
+ void NodesFromRect(float aX, float aY, float aTopSize, float aRightSize,
+ float aBottomSize, float aLeftSize,
+ bool aIgnoreRootScrollFrame, bool aFlushLayout,
+ bool aOnlyVisible, float aVisibleThreshold,
+ nsTArray<RefPtr<nsINode>>&);
+
+ /**
+ * This gets fired when the element that an id refers to changes.
+ * This fires at difficult times. It is generally not safe to do anything
+ * which could modify the DOM in any way. Use
+ * nsContentUtils::AddScriptRunner.
+ * @return true to keep the callback in the callback set, false
+ * to remove it.
+ */
+ typedef bool (*IDTargetObserver)(Element* aOldElement, Element* aNewelement,
+ void* aData);
+
+ /**
+ * Add an IDTargetObserver for a specific ID. The IDTargetObserver
+ * will be fired whenever the content associated with the ID changes
+ * in the future. If aForImage is true, mozSetImageElement can override
+ * what content is associated with the ID. In that case the IDTargetObserver
+ * will be notified at those times when the result of LookupImageElement
+ * changes.
+ * At most one (aObserver, aData, aForImage) triple can be
+ * registered for each ID.
+ * @return the content currently associated with the ID.
+ */
+ Element* AddIDTargetObserver(nsAtom* aID, IDTargetObserver aObserver,
+ void* aData, bool aForImage);
+
+ /**
+ * Remove the (aObserver, aData, aForImage) triple for a specific ID, if
+ * registered.
+ */
+ void RemoveIDTargetObserver(nsAtom* aID, IDTargetObserver aObserver,
+ void* aData, bool aForImage);
+
+ /**
+ * Lookup an image element using its associated ID, which is usually provided
+ * by |-moz-element()|. Similar to GetElementById, with the difference that
+ * elements set using mozSetImageElement have higher priority.
+ * @param aId the ID associated the element we want to lookup
+ * @return the element associated with |aId|
+ */
+ Element* LookupImageElement(const nsAString& aElementId);
+
+ /**
+ * Check that aId is not empty and log a message to the console
+ * service if it is.
+ * @returns true if aId looks correct, false otherwise.
+ */
+ inline bool CheckGetElementByIdArg(const nsAString& aId) {
+ if (aId.IsEmpty()) {
+ ReportEmptyGetElementByIdArg();
+ return false;
+ }
+ return true;
+ }
+
+ void ReportEmptyGetElementByIdArg() const;
+
+ // Web Animations
+ MOZ_CAN_RUN_SCRIPT
+ void GetAnimations(nsTArray<RefPtr<Animation>>& aAnimations);
+
+ nsINode* Retarget(nsINode*) const;
+
+ void OnSetAdoptedStyleSheets(StyleSheet&, uint32_t aIndex, ErrorResult&);
+ void OnDeleteAdoptedStyleSheets(StyleSheet&, uint32_t aIndex, ErrorResult&);
+
+ // This is needed because ServoStyleSet / ServoAuthorData don't deal with
+ // duplicate stylesheets (and it's unclear we'd want to support that as it'd
+ // be a bunch of duplicate work), while adopted stylesheets do need to deal
+ // with them.
+ template <typename Callback>
+ void EnumerateUniqueAdoptedStyleSheetsBackToFront(Callback aCallback) {
+ StyleSheetSet set(mAdoptedStyleSheets.Length());
+ for (StyleSheet* sheet : Reversed(mAdoptedStyleSheets)) {
+ if (MOZ_UNLIKELY(!set.EnsureInserted(sheet))) {
+ continue;
+ }
+ aCallback(*sheet);
+ }
+ }
+
+ protected:
+ // Cycle collection helper functions
+ void TraverseSheetRefInStylesIfApplicable(
+ StyleSheet&, nsCycleCollectionTraversalCallback&);
+ void TraverseStyleSheets(nsTArray<RefPtr<StyleSheet>>&, const char*,
+ nsCycleCollectionTraversalCallback&);
+ void UnlinkStyleSheets(nsTArray<RefPtr<StyleSheet>>&);
+
+ using StyleSheetSet = nsTHashSet<const StyleSheet*>;
+ void RemoveSheetFromStylesIfApplicable(StyleSheet&);
+ void ClearAdoptedStyleSheets();
+
+ /**
+ * Clone's the argument's adopted style sheets into this.
+ * This should only be used when cloning a static document for printing.
+ */
+ void CloneAdoptedSheetsFrom(const DocumentOrShadowRoot&);
+
+ void InsertSheetAt(size_t aIndex, StyleSheet& aSheet);
+
+ void AddSizeOfExcludingThis(nsWindowSizes&) const;
+ void AddSizeOfOwnedSheetArrayExcludingThis(
+ nsWindowSizes&, const nsTArray<RefPtr<StyleSheet>>&) const;
+
+ /**
+ * If focused element's subtree root is this document or shadow root, return
+ * focused element, otherwise, get the shadow host recursively until the
+ * shadow host's subtree root is this document or shadow root.
+ */
+ Element* GetRetargetedFocusedElement();
+
+ nsTArray<RefPtr<StyleSheet>> mStyleSheets;
+ RefPtr<StyleSheetList> mDOMStyleSheets;
+
+ /**
+ * Style sheets that are adopted by assinging to the `adoptedStyleSheets`
+ * WebIDL atribute. These can only be constructed stylesheets.
+ */
+ nsTArray<RefPtr<StyleSheet>> mAdoptedStyleSheets;
+
+ /*
+ * mIdentifierMap works as follows for IDs:
+ * 1) Attribute changes affect the table immediately (removing and adding
+ * entries as needed).
+ * 2) Removals from the DOM affect the table immediately
+ * 3) Additions to the DOM always update existing entries for names, and add
+ * new ones for IDs.
+ */
+ nsTHashtable<IdentifierMapEntry> mIdentifierMap;
+
+ // Always non-null, see comment in the constructor as to why a pointer instead
+ // of a reference.
+ nsINode* mAsNode;
+ const Kind mKind;
+};
+
+inline const nsTArray<Element*>* DocumentOrShadowRoot::GetAllElementsForId(
+ const nsAString& aElementId) const {
+ if (aElementId.IsEmpty()) {
+ return nullptr;
+ }
+
+ IdentifierMapEntry* entry = mIdentifierMap.GetEntry(aElementId);
+ return entry ? &entry->GetIdElements() : nullptr;
+}
+
+} // namespace dom
+
+} // namespace mozilla
+
+#endif