layout/generic/nsContainerFrameInlines.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 nsContainerFrameInlines_h___
   8 #define nsContainerFrameInlines_h___
   9
  10 #include "nsContainerFrame.h"
  11
  12 template <typename ISizeData, typename F>
  13 void nsContainerFrame::DoInlineIntrinsicISize(ISizeData* aData,
  14                                               F& aHandleChildren) {
  15   using namespace mozilla;
  16
  17   auto GetMargin = [](const LengthPercentageOrAuto& aCoord) -> nscoord {
  18     return aCoord.IsAuto() ? 0 : aCoord.AsLengthPercentage().Resolve(0);
  19   };
  20
  21   if (GetPrevInFlow()) return;  // Already added.
  22
  23   WritingMode wm = GetWritingMode();
  24   Side startSide = wm.PhysicalSideForInlineAxis(eLogicalEdgeStart);
  25   Side endSide = wm.PhysicalSideForInlineAxis(eLogicalEdgeEnd);
  26
  27   const nsStylePadding* stylePadding = StylePadding();
  28   const nsStyleBorder* styleBorder = StyleBorder();
  29   const nsStyleMargin* styleMargin = StyleMargin();
  30
  31   // This goes at the beginning no matter how things are broken and how
  32   // messy the bidi situations are, since per CSS2.1 section 8.6
  33   // (implemented in bug 328168), the startSide border is always on the
  34   // first line.
  35   // This frame is a first-in-flow, but it might have a previous bidi
  36   // continuation, in which case that continuation should handle the startSide
  37   // border.
  38   // For box-decoration-break:clone we setup clonePBM = startPBM + endPBM and
  39   // add that to each line.  For box-decoration-break:slice clonePBM is zero.
  40   nscoord clonePBM = 0;  // PBM = PaddingBorderMargin
  41   const bool sliceBreak =
  42       styleBorder->mBoxDecorationBreak == StyleBoxDecorationBreak::Slice;
  43   if (!GetPrevContinuation() || MOZ_UNLIKELY(!sliceBreak)) {
  44     nscoord startPBM =
  45         // clamp negative calc() to 0
  46         std::max(stylePadding->mPadding.Get(startSide).Resolve(0), 0) +
  47         styleBorder->GetComputedBorderWidth(startSide) +
  48         GetMargin(styleMargin->mMargin.Get(startSide));
  49     if (MOZ_LIKELY(sliceBreak)) {
  50       aData->mCurrentLine += startPBM;
  51     } else {
  52       clonePBM = startPBM;
  53     }
  54   }
  55
  56   nscoord endPBM =
  57       // clamp negative calc() to 0
  58       std::max(stylePadding->mPadding.Get(endSide).Resolve(0), 0) +
  59       styleBorder->GetComputedBorderWidth(endSide) +
  60       GetMargin(styleMargin->mMargin.Get(endSide));
  61   if (MOZ_UNLIKELY(!sliceBreak)) {
  62     clonePBM += endPBM;
  63     aData->mCurrentLine += clonePBM;
  64   }
  65
  66   const nsLineList_iterator* savedLine = aData->mLine;
  67   nsIFrame* const savedLineContainer = aData->LineContainer();
  68
  69   nsContainerFrame* lastInFlow;
  70   for (nsContainerFrame* nif = this; nif;
  71        nif = static_cast<nsContainerFrame*>(nif->GetNextInFlow())) {
  72     if (aData->mCurrentLine == 0) {
  73       aData->mCurrentLine = clonePBM;
  74     }
  75     aHandleChildren(nif, aData);
  76
  77     // After we advance to our next-in-flow, the stored line and line container
  78     // may no longer be correct. Just forget them.
  79     aData->mLine = nullptr;
  80     aData->SetLineContainer(nullptr);
  81
  82     lastInFlow = nif;
  83   }
  84
  85   aData->mLine = savedLine;
  86   aData->SetLineContainer(savedLineContainer);
  87
  88   // This goes at the end no matter how things are broken and how
  89   // messy the bidi situations are, since per CSS2.1 section 8.6
  90   // (implemented in bug 328168), the endSide border is always on the
  91   // last line.
  92   // We reached the last-in-flow, but it might have a next bidi
  93   // continuation, in which case that continuation should handle
  94   // the endSide border.
  95   if (MOZ_LIKELY(!lastInFlow->GetNextContinuation() && sliceBreak)) {
  96     aData->mCurrentLine += endPBM;
  97   }
  98 }
  99
 100 #endif  // nsContainerFrameInlines_h___