layout/style/DocumentStyleRootIterator.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 file,
   5  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef DocumentStyleRootIterator_h
   8 #define DocumentStyleRootIterator_h
   9
  10 #include "nsTArray.h"
  11
  12 class nsIContent;
  13
  14 class nsINode;
  15
  16 namespace mozilla {
  17
  18 namespace dom {
  19 class Element;
  20 }  // namespace dom
  21
  22 /**
  23  * DocumentStyleRootIterator traverses the roots of the document from the
  24  * perspective of the Servo-backed style system. In the general case, this
  25  * will first traverse the document root, followed by any document level
  26  * native anonymous content.
  27  *
  28  * If the caller passes an element to the constructor rather than the document,
  29  * that element (and nothing else) is returned from GetNextStyleRoot.
  30  */
  31 class DocumentStyleRootIterator {
  32  public:
  33   explicit DocumentStyleRootIterator(nsINode* aStyleRoot);
  34   MOZ_COUNTED_DTOR(DocumentStyleRootIterator)
  35
  36   dom::Element* GetNextStyleRoot();
  37
  38  private:
  39   AutoTArray<nsIContent*, 8> mStyleRoots;
  40   uint32_t mPosition;
  41 };
  42
  43 }  // namespace mozilla
  44
  45 #endif  // DocumentStyleRootIterator_h