layout/mathml/nsMathMLmrowFrame.cpp

   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 #include "nsMathMLmrowFrame.h"
   8
   9 #include "mozilla/PresShell.h"
  10 #include "mozilla/gfx/2D.h"
  11
  12 using namespace mozilla;
  13
  14 //
  15 // <mrow> -- horizontally group any number of subexpressions - implementation
  16 //
  17
  18 nsIFrame* NS_NewMathMLmrowFrame(PresShell* aPresShell, ComputedStyle* aStyle) {
  19   return new (aPresShell)
  20       nsMathMLmrowFrame(aStyle, aPresShell->GetPresContext());
  21 }
  22
  23 NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmrowFrame)
  24
  25 nsMathMLmrowFrame::~nsMathMLmrowFrame() = default;
  26
  27 NS_IMETHODIMP
  28 nsMathMLmrowFrame::InheritAutomaticData(nsIFrame* aParent) {
  29   // let the base class get the default from our parent
  30   nsMathMLContainerFrame::InheritAutomaticData(aParent);
  31
  32   mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_VERTICALLY;
  33
  34   return NS_OK;
  35 }
  36
  37 nsresult nsMathMLmrowFrame::AttributeChanged(int32_t aNameSpaceID,
  38                                              nsAtom* aAttribute,
  39                                              int32_t aModType) {
  40   // Special for <mtable>: In the frame construction code, we also use
  41   // this frame class as a wrapper for mtable. Hence, we should pass the
  42   // notification to the real mtable
  43   if (mContent->IsMathMLElement(nsGkAtoms::mtable_)) {
  44     nsIFrame* frame = mFrames.FirstChild();
  45     for (; frame; frame = frame->PrincipalChildList().FirstChild()) {
  46       // drill down to the real mtable
  47       if (frame->IsTableWrapperFrame())
  48         return frame->AttributeChanged(aNameSpaceID, aAttribute, aModType);
  49     }
  50     MOZ_ASSERT_UNREACHABLE("mtable wrapper without the real table frame");
  51   }
  52
  53   return nsMathMLContainerFrame::AttributeChanged(aNameSpaceID, aAttribute,
  54                                                   aModType);
  55 }
  56
  57 /* virtual */
  58 eMathMLFrameType nsMathMLmrowFrame::GetMathMLFrameType() {
  59   if (!IsMrowLike()) {
  60     nsIMathMLFrame* child = do_QueryFrame(mFrames.FirstChild());
  61     if (child) {
  62       // We only have one child, so we return the frame type of that child as if
  63       // we didn't exist.
  64       return child->GetMathMLFrameType();
  65     }
  66   }
  67   return nsMathMLFrame::GetMathMLFrameType();
  68 }