DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (57352ccfac02)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160
/* -*- 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/. */

#include "nsMathMLSelectedFrame.h"
#include "nsDisplayList.h"

using namespace mozilla;

nsMathMLSelectedFrame::~nsMathMLSelectedFrame() {}

NS_IMETHODIMP
nsMathMLSelectedFrame::TransmitAutomaticData() {
  // Note that to determine space-like and embellished op properties:
  //   - <semantics> behaves the same as <maction>
  //   - <annotation-xml> behaves the same as <mrow>

  // The REC defines the following element to be space-like:
  // * an maction element whose selected sub-expression exists and is
  //   space-like;
  nsIMathMLFrame* mathMLFrame = do_QueryFrame(mSelectedFrame);
  if (mathMLFrame && mathMLFrame->IsSpaceLike()) {
    mPresentationData.flags |= NS_MATHML_SPACE_LIKE;
  } else {
    mPresentationData.flags &= ~NS_MATHML_SPACE_LIKE;
  }

  // The REC defines the following element to be an embellished operator:
  // * an maction element whose selected sub-expression exists and is an
  //   embellished operator;
  mPresentationData.baseFrame = mSelectedFrame;
  GetEmbellishDataFrom(mSelectedFrame, mEmbellishData);

  return NS_OK;
}

nsresult nsMathMLSelectedFrame::ChildListChanged(int32_t aModType) {
  GetSelectedFrame();
  return nsMathMLContainerFrame::ChildListChanged(aModType);
}

void nsMathMLSelectedFrame::SetInitialChildList(ChildListID aListID,
                                                nsFrameList& aChildList) {
  nsMathMLContainerFrame::SetInitialChildList(aListID, aChildList);
  // This very first call to GetSelectedFrame() will cause us to be marked as an
  // embellished operator if the selected child is an embellished operator
  GetSelectedFrame();
}

//  Only paint the selected child...
void nsMathMLSelectedFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
                                             const nsDisplayListSet& aLists) {
  // Report an error if something wrong was found in this frame.
  // We can't call nsDisplayMathMLError from here,
  // so ask nsMathMLContainerFrame to do the work for us.
  if (NS_MATHML_HAS_ERROR(mPresentationData.flags)) {
    nsMathMLContainerFrame::BuildDisplayList(aBuilder, aLists);
    return;
  }

  DisplayBorderBackgroundOutline(aBuilder, aLists);

  nsIFrame* childFrame = GetSelectedFrame();
  if (childFrame) {
    // Put the child's background directly onto the content list
    nsDisplayListSet set(aLists, aLists.Content());
    // The children should be in content order
    BuildDisplayListForChild(aBuilder, childFrame, set);
  }

#if defined(DEBUG) && defined(SHOW_BOUNDING_BOX)
  // visual debug
  DisplayBoundingMetrics(aBuilder, this, mReference, mBoundingMetrics, aLists);
#endif
}

/* virtual */
LogicalSize nsMathMLSelectedFrame::ComputeSize(
    gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
    nscoord aAvailableISize, const LogicalSize& aMargin,
    const LogicalSize& aBorder, const LogicalSize& aPadding,
    ComputeSizeFlags aFlags) {
  nsIFrame* childFrame = GetSelectedFrame();
  if (childFrame) {
    // Delegate size computation to the child frame.
    // Try to account for border/padding/margin on this frame and the child,
    // though we don't really support them during reflow anyway...
    nscoord availableISize = aAvailableISize - aBorder.ISize(aWM) -
                             aPadding.ISize(aWM) - aMargin.ISize(aWM);
    LogicalSize cbSize = aCBSize - aBorder - aPadding - aMargin;
    SizeComputationInput offsetState(childFrame, aRenderingContext, aWM,
                                     availableISize);
    LogicalSize size = childFrame->ComputeSize(
        aRenderingContext, aWM, cbSize, availableISize,
        offsetState.ComputedLogicalMargin().Size(aWM),
        offsetState.ComputedLogicalBorderPadding().Size(aWM) -
            offsetState.ComputedLogicalPadding().Size(aWM),
        offsetState.ComputedLogicalPadding().Size(aWM), aFlags);
    return size + offsetState.ComputedLogicalBorderPadding().Size(aWM);
  }
  return LogicalSize(aWM);
}

// Only reflow the selected child ...
void nsMathMLSelectedFrame::Reflow(nsPresContext* aPresContext,
                                   ReflowOutput& aDesiredSize,
                                   const ReflowInput& aReflowInput,
                                   nsReflowStatus& aStatus) {
  MarkInReflow();
  MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");

  mPresentationData.flags &= ~NS_MATHML_ERROR;
  aDesiredSize.ClearSize();
  aDesiredSize.SetBlockStartAscent(0);
  mBoundingMetrics = nsBoundingMetrics();
  nsIFrame* childFrame = GetSelectedFrame();
  if (childFrame) {
    WritingMode wm = childFrame->GetWritingMode();
    LogicalSize availSize = aReflowInput.ComputedSize(wm);
    availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE;
    ReflowInput childReflowInput(aPresContext, aReflowInput, childFrame,
                                 availSize);
    ReflowChild(childFrame, aPresContext, aDesiredSize, childReflowInput,
                aStatus);
    SaveReflowAndBoundingMetricsFor(childFrame, aDesiredSize,
                                    aDesiredSize.mBoundingMetrics);
    mBoundingMetrics = aDesiredSize.mBoundingMetrics;
  }
  FinalizeReflow(aReflowInput.mRenderingContext->GetDrawTarget(), aDesiredSize);
  NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aDesiredSize);
}

// Only place the selected child ...
/* virtual */
nsresult nsMathMLSelectedFrame::Place(DrawTarget* aDrawTarget,
                                      bool aPlaceOrigin,
                                      ReflowOutput& aDesiredSize) {
  nsIFrame* childFrame = GetSelectedFrame();

  if (mInvalidMarkup) {
    return ReflowError(aDrawTarget, aDesiredSize);
  }

  aDesiredSize.ClearSize();
  aDesiredSize.SetBlockStartAscent(0);
  mBoundingMetrics = nsBoundingMetrics();
  if (childFrame) {
    GetReflowAndBoundingMetricsFor(childFrame, aDesiredSize, mBoundingMetrics);
    if (aPlaceOrigin) {
      FinishReflowChild(childFrame, PresContext(), aDesiredSize, nullptr, 0, 0,
                        0);
    }
    mReference.x = 0;
    mReference.y = aDesiredSize.BlockStartAscent();
  }
  aDesiredSize.mBoundingMetrics = mBoundingMetrics;
  return NS_OK;
}