layout/mathml/nsMathMLmspaceFrame.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 "nsMathMLmspaceFrame.h"
   8
   9 #include "mozilla/dom/MathMLElement.h"
  10 #include "mozilla/PresShell.h"
  11 #include "mozilla/gfx/2D.h"
  12 #include "nsLayoutUtils.h"
  13 #include <algorithm>
  14
  15 using namespace mozilla;
  16
  17 //
  18 // <mspace> -- space - implementation
  19 //
  20
  21 nsIFrame* NS_NewMathMLmspaceFrame(PresShell* aPresShell,
  22                                   ComputedStyle* aStyle) {
  23   return new (aPresShell)
  24       nsMathMLmspaceFrame(aStyle, aPresShell->GetPresContext());
  25 }
  26
  27 NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmspaceFrame)
  28
  29 nsMathMLmspaceFrame::~nsMathMLmspaceFrame() = default;
  30
  31 nsresult nsMathMLmspaceFrame::AttributeChanged(int32_t aNameSpaceID,
  32                                                nsAtom* aAttribute,
  33                                                int32_t aModType) {
  34   if (aNameSpaceID == kNameSpaceID_None) {
  35     bool hasDirtyAttributes = false;
  36     IntrinsicDirty intrinsicDirty = IntrinsicDirty::None;
  37     if (aAttribute == nsGkAtoms::width) {
  38       mWidth.mState = Attribute::ParsingState::Dirty;
  39       hasDirtyAttributes = true;
  40       intrinsicDirty = IntrinsicDirty::FrameAndAncestors;
  41     } else if (aAttribute == nsGkAtoms::height) {
  42       mHeight.mState = Attribute::ParsingState::Dirty;
  43       hasDirtyAttributes = true;
  44     } else if (aAttribute == nsGkAtoms::depth_) {
  45       mDepth.mState = Attribute::ParsingState::Dirty;
  46       hasDirtyAttributes = true;
  47     }
  48     if (hasDirtyAttributes) {
  49       PresShell()->FrameNeedsReflow(this, intrinsicDirty, NS_FRAME_IS_DIRTY);
  50     }
  51     return NS_OK;
  52   }
  53   return nsMathMLContainerFrame::AttributeChanged(aNameSpaceID, aAttribute,
  54                                                   aModType);
  55 }
  56
  57 nscoord nsMathMLmspaceFrame::CalculateAttributeValue(nsAtom* aAtom,
  58                                                      Attribute& aAttribute,
  59                                                      uint32_t aFlags,
  60                                                      float aFontSizeInflation) {
  61   if (aAttribute.mState == Attribute::ParsingState::Dirty) {
  62     nsAutoString value;
  63     aAttribute.mState = Attribute::ParsingState::Invalid;
  64     mContent->AsElement()->GetAttr(aAtom, value);
  65     if (!value.IsEmpty()) {
  66       if (dom::MathMLElement::ParseNumericValue(
  67               value, aAttribute.mValue, aFlags, PresContext()->Document())) {
  68         aAttribute.mState = Attribute::ParsingState::Valid;
  69       } else {
  70         ReportParseError(aAtom->GetUTF16String(), value.get());
  71       }
  72     }
  73   }
  74   // Invalid is interpreted as the default which is 0.
  75   // Percentages are interpreted as a multiple of the default value.
  76   if (aAttribute.mState == Attribute::ParsingState::Invalid ||
  77       aAttribute.mValue.GetUnit() == eCSSUnit_Percent) {
  78     return 0;
  79   }
  80   return CalcLength(PresContext(), mComputedStyle, aAttribute.mValue,
  81                     aFontSizeInflation);
  82 }
  83
  84 nsresult nsMathMLmspaceFrame::Place(DrawTarget* aDrawTarget,
  85                                     const PlaceFlags& aFlags,
  86                                     ReflowOutput& aDesiredSize) {
  87   float fontSizeInflation = nsLayoutUtils::FontSizeInflationFor(this);
  88
  89   // <mspace/> is listed among MathML elements allowing negative spacing and
  90   // the MathML test suite contains "Presentation/TokenElements/mspace/mspace2"
  91   // as an example. Hence we allow negative values.
  92   nscoord width = CalculateAttributeValue(
  93       nsGkAtoms::width, mWidth, dom::MathMLElement::PARSE_ALLOW_NEGATIVE,
  94       fontSizeInflation);
  95
  96   // We do not allow negative values for height and depth attributes. See bug
  97   // 716349.
  98   nscoord height =
  99       CalculateAttributeValue(nsGkAtoms::height, mHeight, 0, fontSizeInflation);
 100   nscoord depth =
 101       CalculateAttributeValue(nsGkAtoms::depth_, mDepth, 0, fontSizeInflation);
 102
 103   mBoundingMetrics = nsBoundingMetrics();
 104   mBoundingMetrics.width = width;
 105   mBoundingMetrics.ascent = height;
 106   mBoundingMetrics.descent = depth;
 107   mBoundingMetrics.leftBearing = 0;
 108   mBoundingMetrics.rightBearing = mBoundingMetrics.width;
 109
 110   aDesiredSize.SetBlockStartAscent(mBoundingMetrics.ascent);
 111   aDesiredSize.Width() = std::max(0, mBoundingMetrics.width);
 112   aDesiredSize.Height() = mBoundingMetrics.ascent + mBoundingMetrics.descent;
 113   // Also return our bounding metrics
 114   aDesiredSize.mBoundingMetrics = mBoundingMetrics;
 115
 116   // Apply width/height to math content box.
 117   const PlaceFlags flags;
 118   auto sizes = GetWidthAndHeightForPlaceAdjustment(flags);
 119   ApplyAdjustmentForWidthAndHeight(flags, sizes, aDesiredSize,
 120                                    mBoundingMetrics);
 121
 122   // Add padding+border.
 123   auto borderPadding = GetBorderPaddingForPlace(aFlags);
 124   InflateReflowAndBoundingMetrics(borderPadding, aDesiredSize,
 125                                   mBoundingMetrics);
 126   return NS_OK;
 127 }