gecko-dev/dom/base/DocumentOrShadowRoot.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/. */
#ifndef mozilla_dom_DocumentOrShadowRoot_h__
#define mozilla_dom_DocumentOrShadowRoot_h__
#include "mozilla/dom/NameSpaceConstants.h"
#include "mozilla/IdentifierMapEntry.h"
#include "nsClassHashtable.h"
#include "nsContentListDeclarations.h"
#include "nsTArray.h"
class nsContentList;
class nsCycleCollectionTraversalCallback;
class nsINode;
class nsINodeList;
class nsIRadioVisitor;
class nsWindowSizes;
namespace mozilla {
class StyleSheet;
namespace dom {
class Element;
class DocumentOrShadowRoot;
class HTMLInputElement;
struct nsRadioGroupStruct;
class StyleSheetList;
class ShadowRoot;
/**
* 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 {
enum class Kind {
Document,
ShadowRoot,
};
public:
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(); }
int32_t IndexOfSheet(const StyleSheet& aSheet) const {
return mStyleSheets.IndexOf(&aSheet);
}
StyleSheetList& EnsureDOMStyleSheets();
Element* GetElementById(const nsAString& aElementId);
/**
* 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();
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);
void NodesFromRect(float aX, float aY, float aTopSize, float aRightSize,
float aBottomSize, float aLeftSize,
bool aIgnoreRootScrollFrame, bool aFlushLayout,
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();
// nsIRadioGroupContainer
NS_IMETHOD WalkRadioGroup(const nsAString& aName, nsIRadioVisitor* aVisitor,
bool aFlushContent);
void SetCurrentRadioButton(const nsAString& aName, HTMLInputElement* aRadio);
HTMLInputElement* GetCurrentRadioButton(const nsAString& aName);
nsresult GetNextRadioButton(const nsAString& aName, const bool aPrevious,
HTMLInputElement* aFocusedRadio,
HTMLInputElement** aRadioOut);
void AddToRadioGroup(const nsAString& aName, HTMLInputElement* aRadio);
void RemoveFromRadioGroup(const nsAString& aName, HTMLInputElement* aRadio);
uint32_t GetRequiredRadioCount(const nsAString& aName) const;
void RadioRequiredWillChange(const nsAString& aName, bool aRequiredAdded);
bool GetValueMissingState(const nsAString& aName) const;
void SetValueMissingState(const nsAString& aName, bool aValue);
// for radio group
nsRadioGroupStruct* GetRadioGroup(const nsAString& aName) const;
nsRadioGroupStruct* GetOrCreateRadioGroup(const nsAString& aName);
nsIContent* Retarget(nsIContent* aContent) const;
protected:
// Returns the reference to the sheet, if found in mStyleSheets.
already_AddRefed<StyleSheet> RemoveSheet(StyleSheet& aSheet);
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;
/*
* 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;
nsClassHashtable<nsStringHashKey, nsRadioGroupStruct> mRadioGroups;
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