layout/generic/nsAtomicContainerFrame.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 /* base class for rendering objects that need child lists but behave like leaf
   8  */
   9
  10 #ifndef nsAtomicContainerFrame_h___
  11 #define nsAtomicContainerFrame_h___
  12
  13 #include "nsContainerFrame.h"
  14
  15 /**
  16  * This class is for frames which need child lists but act like a leaf
  17  * frame. In general, all frames of elements laid out according to the
  18  * CSS box model would need child list for ::backdrop in case they are
  19  * in fullscreen, while some of them still want leaf frame behavior.
  20  */
  21 class nsAtomicContainerFrame : public nsContainerFrame {
  22  public:
  23   NS_DECL_ABSTRACT_FRAME(nsAtomicContainerFrame)
  24
  25   // Bypass the nsContainerFrame/nsSplittableFrame impl of the following
  26   // methods so we behave like a leaf frame.
  27   FrameSearchResult PeekOffsetNoAmount(bool aForward,
  28                                        int32_t* aOffset) override {
  29     return nsIFrame::PeekOffsetNoAmount(aForward, aOffset);
  30   }
  31   FrameSearchResult PeekOffsetCharacter(
  32       bool aForward, int32_t* aOffset,
  33       PeekOffsetCharacterOptions aOptions =
  34           PeekOffsetCharacterOptions()) override {
  35     return nsIFrame::PeekOffsetCharacter(aForward, aOffset, aOptions);
  36   }
  37
  38  protected:
  39   nsAtomicContainerFrame(ComputedStyle* aStyle, nsPresContext* aPresContext,
  40                          ClassID aID)
  41       : nsContainerFrame(aStyle, aPresContext, aID) {}
  42 };
  43
  44 #endif  // nsAtomicContainerFrame_h___