gecko-dev/layout/generic/nsAtomicContainerFrame.h

/* -*- 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/. */

/* base class for rendering objects that need child lists but behave like leaf
 */

#ifndef nsAtomicContainerFrame_h___
#define nsAtomicContainerFrame_h___

#include "nsContainerFrame.h"

/**
 * This class is for frames which need child lists but act like a leaf
 * frame. In general, all frames of elements laid out according to the
 * CSS box model would need child list for ::backdrop in case they are
 * in fullscreen, while some of them still want leaf frame behavior.
 */
class nsAtomicContainerFrame : public nsContainerFrame {
 public:
  NS_DECL_ABSTRACT_FRAME(nsAtomicContainerFrame)

  // Bypass the nsContainerFrame/nsSplittableFrame impl of the following
  // methods so we behave like a leaf frame.
  FrameSearchResult PeekOffsetNoAmount(bool aForward,
                                       int32_t* aOffset) override {
    return nsFrame::PeekOffsetNoAmount(aForward, aOffset);
  }
  FrameSearchResult PeekOffsetCharacter(
      bool aForward, int32_t* aOffset,
      PeekOffsetCharacterOptions aOptions =
          PeekOffsetCharacterOptions()) override {
    return nsFrame::PeekOffsetCharacter(aForward, aOffset, aOptions);
  }

 protected:
  nsAtomicContainerFrame(ComputedStyle* aStyle, nsPresContext* aPresContext,
                         ClassID aID)
      : nsContainerFrame(aStyle, aPresContext, aID) {}
};

#endif  // nsAtomicContainerFrame_h___