dom/svg/SVGStyleElement.h
author Nathan Froyd <froydnj@mozilla.com>
Fri, 21 Sep 2018 16:45:49 -0400
changeset 496222 a14c288aec85e9e772dbb5e118a16c16cb95cc83
parent 488329 36a50c3f679a741a2a3a1ca89b192e8656262d0d
child 508163 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1492894 - part 1 - make the node hierarchy consistently constructed with NodeInfo&&; r=mccr8 Various places in dom/ use the pattern: already_AddRefed<NodeInfo> ni = ...; which is supposed to be disallowed by our static analysis code, but isn't, for whatever reason. To fix our static analysis code, we need to eliminate instances of the above pattern. Unfortunately, eliminating this pattern requires restructuring how Nodes are created. Most Node subclasses take `already_AddRefed<NodeInfo>&` in their constructors, and a few accept `already_AddRefed<NodeInfo>&&`. We need to enforce the latter pattern consistently, which requires changing dozens of source files.

/* -*- 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_SVGStyleElement_h
#define mozilla_dom_SVGStyleElement_h

#include "mozilla/Attributes.h"
#include "nsSVGElement.h"
#include "nsStyleLinkElement.h"
#include "nsStubMutationObserver.h"

nsresult NS_NewSVGStyleElement(nsIContent **aResult,
                               already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo);

typedef nsSVGElement SVGStyleElementBase;

namespace mozilla {
namespace dom {

class SVGStyleElement final : public SVGStyleElementBase,
                              public nsStyleLinkElement,
                              public nsStubMutationObserver
{
protected:
  friend nsresult (::NS_NewSVGStyleElement(nsIContent **aResult,
                                           already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo));
  explicit SVGStyleElement(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo);
  ~SVGStyleElement();

  virtual JSObject* WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto) override;

public:
  NS_DECL_ISUPPORTS_INHERITED

  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(SVGStyleElement,
                                           SVGStyleElementBase)

  // nsIContent
  virtual nsresult BindToTree(nsIDocument* aDocument, nsIContent* aParent,
                              nsIContent* aBindingParent) override;
  virtual void UnbindFromTree(bool aDeep = true,
                              bool aNullParent = true) override;
  virtual nsresult AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
                                const nsAttrValue* aValue,
                                const nsAttrValue* aOldValue,
                                nsIPrincipal* aMaybeScriptedPrincipal,
                                bool aNotify) override;
  virtual bool ParseAttribute(int32_t aNamespaceID,
                              nsAtom* aAttribute,
                              const nsAString& aValue,
                              nsIPrincipal* aMaybeScriptedPrincipal,
                              nsAttrValue& aResult) override;

  virtual nsresult Clone(dom::NodeInfo*, nsINode** aResult) const override;

  // nsIMutationObserver
  NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED
  NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
  NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
  NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED

  // WebIDL
  void GetXmlspace(nsAString & aXmlspace);
  void SetXmlspace(const nsAString & aXmlspace, ErrorResult& rv);
  void GetMedia(nsAString & aMedia);
  void SetMedia(const nsAString& aMedia, ErrorResult& rv);
  void GetType(nsAString & aType);
  void SetType(const nsAString& aType, ErrorResult& rv);
  void GetTitle(nsAString & aTitle);
  void SetTitle(const nsAString& aTitle, ErrorResult& rv);

protected:
  // Dummy init method to make the NS_IMPL_NS_NEW_SVG_ELEMENT and
  // NS_IMPL_ELEMENT_CLONE_WITH_INIT usable with this class. This should be
  // completely optimized away.
  inline nsresult Init()
  {
    return NS_OK;
  }

  // nsStyleLinkElement overrides
  Maybe<SheetInfo> GetStyleSheetInfo() final;

  /**
   * Common method to call from the various mutation observer methods.
   * aContent is a content node that's either the one that changed or its
   * parent; we should only respond to the change if aContent is non-anonymous.
   */
  void ContentChanged(nsIContent* aContent);
};

} // namespace dom
} // namespace mozilla

#endif // mozilla_dom_SVGStyleElement_h