dom/base/GeneratedImageContent.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef dom_base_GeneratedImageContent_h
   8 #define dom_base_GeneratedImageContent_h
   9
  10 /* A content node that keeps track of an index in the parent's `content`
  11  * property value, used for url() values in the content of a ::before or ::after
  12  * pseudo-element. */
  13
  14 #include "mozilla/dom/HTMLElementBinding.h"
  15 #include "mozilla/dom/NameSpaceConstants.h"
  16 #include "mozilla/dom/NodeInfo.h"
  17 #include "nsGenericHTMLElement.h"
  18
  19 namespace mozilla::dom {
  20
  21 class GeneratedImageContent final : public nsGenericHTMLElement {
  22  public:
  23   static already_AddRefed<GeneratedImageContent> Create(Document&,
  24                                                         uint32_t aContentIndex);
  25   // An image created from 'list-style-image' for a ::marker pseudo.
  26   static already_AddRefed<GeneratedImageContent> CreateForListStyleImage(
  27       Document&);
  28
  29   explicit GeneratedImageContent(already_AddRefed<dom::NodeInfo>&& aNodeInfo)
  30       : nsGenericHTMLElement(std::move(aNodeInfo)) {
  31     MOZ_ASSERT(IsInNamespace(kNameSpaceID_XHTML),
  32                "Someone messed up our nodeinfo");
  33   }
  34
  35   ElementState IntrinsicState() const override {
  36     ElementState state = nsGenericHTMLElement::IntrinsicState();
  37     if (mBroken) {
  38       state |= ElementState::BROKEN;
  39     }
  40     return state;
  41   }
  42   nsresult Clone(dom::NodeInfo* aNodeInfo, nsINode** aResult) const final;
  43
  44   nsresult CopyInnerTo(GeneratedImageContent* aDest) {
  45     nsresult rv = nsGenericHTMLElement::CopyInnerTo(aDest);
  46     NS_ENSURE_SUCCESS(rv, rv);
  47     aDest->mIndex = mIndex;
  48     return NS_OK;
  49   }
  50
  51   // Is this an image created from 'list-style-image'?
  52   bool IsForListStyleImageMarker() const { return Index() == uint32_t(-1); }
  53
  54   // @note we use -1 for images created from 'list-style-image'
  55   uint32_t Index() const { return mIndex; }
  56
  57   // Notify this image failed to load.
  58   void NotifyLoadFailed() {
  59     mBroken = true;
  60     UpdateState(true);
  61   }
  62
  63  protected:
  64   JSObject* WrapNode(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) final;
  65
  66  private:
  67   virtual ~GeneratedImageContent() = default;
  68   uint32_t mIndex = 0;
  69   bool mBroken = false;
  70 };
  71
  72 }  // namespace mozilla::dom
  73
  74 #endif  // dom_base_GeneratedImageContent_h