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Mypal/layout/mathml/nsMathMLmtableFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "nsMathMLmtableFrame.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsStyleConsts.h"
#include "nsNameSpaceManager.h"
#include "nsRenderingContext.h"
#include "nsCSSRendering.h"
#include "nsMathMLElement.h"
#include "nsTArray.h"
#include "nsTableFrame.h"
#include "celldata.h"
#include "mozilla/RestyleManagerHandle.h"
#include "mozilla/RestyleManagerHandleInlines.h"
#include <algorithm>
#include "nsIScriptError.h"
#include "nsContentUtils.h"
using namespace mozilla;
using namespace mozilla::image;
//
// <mtable> -- table or matrix - implementation
//
static int8_t
ParseStyleValue(nsIAtom* aAttribute, const nsAString& aAttributeValue)
{
if (aAttribute == nsGkAtoms::rowalign_) {
if (aAttributeValue.EqualsLiteral("top"))
return NS_STYLE_VERTICAL_ALIGN_TOP;
else if (aAttributeValue.EqualsLiteral("bottom"))
return NS_STYLE_VERTICAL_ALIGN_BOTTOM;
else if (aAttributeValue.EqualsLiteral("center"))
return NS_STYLE_VERTICAL_ALIGN_MIDDLE;
else
return NS_STYLE_VERTICAL_ALIGN_BASELINE;
} else if (aAttribute == nsGkAtoms::columnalign_) {
if (aAttributeValue.EqualsLiteral("left"))
return NS_STYLE_TEXT_ALIGN_LEFT;
else if (aAttributeValue.EqualsLiteral("right"))
return NS_STYLE_TEXT_ALIGN_RIGHT;
else
return NS_STYLE_TEXT_ALIGN_CENTER;
} else if (aAttribute == nsGkAtoms::rowlines_ ||
aAttribute == nsGkAtoms::columnlines_) {
if (aAttributeValue.EqualsLiteral("solid"))
return NS_STYLE_BORDER_STYLE_SOLID;
else if (aAttributeValue.EqualsLiteral("dashed"))
return NS_STYLE_BORDER_STYLE_DASHED;
else
return NS_STYLE_BORDER_STYLE_NONE;
} else {
MOZ_CRASH("Unrecognized attribute.");
}
return -1;
}
static nsTArray<int8_t>*
ExtractStyleValues(const nsAString& aString,
nsIAtom* aAttribute,
bool aAllowMultiValues)
{
nsTArray<int8_t>* styleArray = nullptr;
const char16_t* start = aString.BeginReading();
const char16_t* end = aString.EndReading();
int32_t startIndex = 0;
int32_t count = 0;
while (start < end) {
// Skip leading spaces.
while ((start < end) && nsCRT::IsAsciiSpace(*start)) {
start++;
startIndex++;
}
// Look for the end of the string, or another space.
while ((start < end) && !nsCRT::IsAsciiSpace(*start)) {
start++;
count++;
}
// Grab the value found and process it.
if (count > 0) {
if (!styleArray)
styleArray = new nsTArray<int8_t>();
// We want to return a null array if an attribute gives multiple values,
// but multiple values aren't allowed.
if (styleArray->Length() > 1 && !aAllowMultiValues) {
delete styleArray;
return nullptr;
}
nsDependentSubstring valueString(aString, startIndex, count);
int8_t styleValue = ParseStyleValue(aAttribute, valueString);
styleArray->AppendElement(styleValue);
startIndex += count;
count = 0;
}
}
return styleArray;
}
static nsresult
ReportParseError(nsIFrame* aFrame,
const char16_t* aAttribute,
const char16_t* aValue)
{
nsIContent* content = aFrame->GetContent();
const char16_t* params[] =
{ aValue, aAttribute, content->NodeInfo()->NameAtom()->GetUTF16String() };
return nsContentUtils::ReportToConsole(nsIScriptError::errorFlag,
NS_LITERAL_CSTRING("Layout: MathML"),
content->OwnerDoc(),
nsContentUtils::eMATHML_PROPERTIES,
"AttributeParsingError", params, 3);
}
// Each rowalign='top bottom' or columnalign='left right center' (from
// <mtable> or <mtr>) is split once into an nsTArray<int8_t> which is
// stored in the property table. Row/Cell frames query the property table
// to see what values apply to them.
NS_DECLARE_FRAME_PROPERTY_DELETABLE(RowAlignProperty, nsTArray<int8_t>)
NS_DECLARE_FRAME_PROPERTY_DELETABLE(RowLinesProperty, nsTArray<int8_t>)
NS_DECLARE_FRAME_PROPERTY_DELETABLE(ColumnAlignProperty, nsTArray<int8_t>)
NS_DECLARE_FRAME_PROPERTY_DELETABLE(ColumnLinesProperty, nsTArray<int8_t>)
static const FramePropertyDescriptor<nsTArray<int8_t>>*
AttributeToProperty(nsIAtom* aAttribute)
{
if (aAttribute == nsGkAtoms::rowalign_)
return RowAlignProperty();
if (aAttribute == nsGkAtoms::rowlines_)
return RowLinesProperty();
if (aAttribute == nsGkAtoms::columnalign_)
return ColumnAlignProperty();
NS_ASSERTION(aAttribute == nsGkAtoms::columnlines_, "Invalid attribute");
return ColumnLinesProperty();
}
/* This method looks for a property that applies to a cell, but it looks
* recursively because some cell properties can come from the cell, a row,
* a table, etc. This function searches through the hierarchy for a property
* and returns its value. The function stops searching after checking a <mtable>
* frame.
*/
static nsTArray<int8_t>*
FindCellProperty(const nsIFrame* aCellFrame,
const FramePropertyDescriptor<nsTArray<int8_t>>* aFrameProperty)
{
const nsIFrame* currentFrame = aCellFrame;
nsTArray<int8_t>* propertyData = nullptr;
while (currentFrame) {
propertyData = currentFrame->GetProperty(aFrameProperty);
bool frameIsTable = (currentFrame->GetType() == nsGkAtoms::tableFrame);
if (propertyData || frameIsTable)
currentFrame = nullptr; // A null frame pointer exits the loop
else
currentFrame = currentFrame->GetParent(); // Go to the parent frame
}
return propertyData;
}
static void
ApplyBorderToStyle(const nsMathMLmtdFrame* aFrame,
nsStyleBorder& aStyleBorder)
{
uint32_t rowIndex = aFrame->RowIndex();
uint32_t columnIndex = aFrame->ColIndex();
nscoord borderWidth =
aFrame->PresContext()->GetBorderWidthTable()[NS_STYLE_BORDER_WIDTH_THIN];
nsTArray<int8_t>* rowLinesList =
FindCellProperty(aFrame, RowLinesProperty());
nsTArray<int8_t>* columnLinesList =
FindCellProperty(aFrame, ColumnLinesProperty());
// We don't place a row line on top of the first row
if (rowIndex > 0 && rowLinesList) {
// If the row number is greater than the number of provided rowline
// values, we simply repeat the last value.
uint32_t listLength = rowLinesList->Length();
if (rowIndex < listLength) {
aStyleBorder.SetBorderStyle(NS_SIDE_TOP,
rowLinesList->ElementAt(rowIndex - 1));
} else {
aStyleBorder.SetBorderStyle(NS_SIDE_TOP,
rowLinesList->ElementAt(listLength - 1));
}
aStyleBorder.SetBorderWidth(NS_SIDE_TOP, borderWidth);
}
// We don't place a column line on the left of the first column.
if (columnIndex > 0 && columnLinesList) {
// If the column number is greater than the number of provided columline
// values, we simply repeat the last value.
uint32_t listLength = columnLinesList->Length();
if (columnIndex < listLength) {
aStyleBorder.SetBorderStyle(NS_SIDE_LEFT,
columnLinesList->ElementAt(columnIndex - 1));
} else {
aStyleBorder.SetBorderStyle(NS_SIDE_LEFT,
columnLinesList->ElementAt(listLength - 1));
}
aStyleBorder.SetBorderWidth(NS_SIDE_LEFT, borderWidth);
}
}
static nsMargin
ComputeBorderOverflow(nsMathMLmtdFrame* aFrame,
const nsStyleBorder& aStyleBorder)
{
nsMargin overflow;
int32_t rowIndex;
int32_t columnIndex;
nsTableFrame* table = aFrame->GetTableFrame();
aFrame->GetCellIndexes(rowIndex, columnIndex);
if (!columnIndex) {
overflow.left = table->GetColSpacing(-1);
overflow.right = table->GetColSpacing(0) / 2;
} else if (columnIndex == table->GetColCount() - 1) {
overflow.left = table->GetColSpacing(columnIndex - 1) / 2;
overflow.right = table->GetColSpacing(columnIndex + 1);
} else {
overflow.left = table->GetColSpacing(columnIndex - 1) / 2;
overflow.right = table->GetColSpacing(columnIndex) / 2;
}
if (!rowIndex) {
overflow.top = table->GetRowSpacing(-1);
overflow.bottom = table->GetRowSpacing(0) / 2;
} else if (rowIndex == table->GetRowCount() - 1) {
overflow.top = table->GetRowSpacing(rowIndex - 1) / 2;
overflow.bottom = table->GetRowSpacing(rowIndex + 1);
} else {
overflow.top = table->GetRowSpacing(rowIndex - 1) / 2;
overflow.bottom = table->GetRowSpacing(rowIndex) / 2;
}
return overflow;
}
/*
* A variant of the nsDisplayBorder contains special code to render a border
* around a nsMathMLmtdFrame based on the rowline and columnline properties
* set on the cell frame.
*/
class nsDisplaymtdBorder : public nsDisplayBorder
{
public:
nsDisplaymtdBorder(nsDisplayListBuilder* aBuilder, nsMathMLmtdFrame* aFrame)
: nsDisplayBorder(aBuilder, aFrame)
{
}
nsDisplayItemGeometry* AllocateGeometry(nsDisplayListBuilder* aBuilder) override
{
return new nsDisplayItemGenericImageGeometry(this, aBuilder);
}
void ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion) override
{
auto geometry =
static_cast<const nsDisplayItemGenericImageGeometry*>(aGeometry);
if (aBuilder->ShouldSyncDecodeImages() &&
geometry->ShouldInvalidateToSyncDecodeImages()) {
bool snap;
aInvalidRegion->Or(*aInvalidRegion, GetBounds(aBuilder, &snap));
}
nsDisplayItem::ComputeInvalidationRegion(aBuilder, aGeometry, aInvalidRegion);
}
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) override
{
*aSnap = true;
nsStyleBorder styleBorder = *mFrame->StyleBorder();
nsMathMLmtdFrame* frame = static_cast<nsMathMLmtdFrame*>(mFrame);
ApplyBorderToStyle(frame, styleBorder);
nsRect bounds = CalculateBounds(styleBorder);
nsMargin overflow = ComputeBorderOverflow(frame, styleBorder);
bounds.Inflate(overflow);
return bounds;
}
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) override
{
nsStyleBorder styleBorder = *mFrame->StyleBorder();
nsMathMLmtdFrame* frame = static_cast<nsMathMLmtdFrame*>(mFrame);
ApplyBorderToStyle(frame, styleBorder);
nsRect bounds = nsRect(ToReferenceFrame(), mFrame->GetSize());
nsMargin overflow = ComputeBorderOverflow(frame, styleBorder);
bounds.Inflate(overflow);
PaintBorderFlags flags = aBuilder->ShouldSyncDecodeImages()
? PaintBorderFlags::SYNC_DECODE_IMAGES
: PaintBorderFlags();
DrawResult result =
nsCSSRendering::PaintBorderWithStyleBorder(mFrame->PresContext(), *aCtx,
mFrame, mVisibleRect,
bounds,
styleBorder,
mFrame->StyleContext(),
flags,
mFrame->GetSkipSides());
nsDisplayItemGenericImageGeometry::UpdateDrawResult(this, result);
}
};
#ifdef DEBUG
#define DEBUG_VERIFY_THAT_FRAME_IS(_frame, _expected) \
MOZ_ASSERT(mozilla::StyleDisplay::_expected == _frame->StyleDisplay()->mDisplay, \
"internal error");
#else
#define DEBUG_VERIFY_THAT_FRAME_IS(_frame, _expected)
#endif
static void
ParseFrameAttribute(nsIFrame* aFrame,
nsIAtom* aAttribute,
bool aAllowMultiValues)
{
nsAutoString attrValue;
nsIContent* frameContent = aFrame->GetContent();
frameContent->GetAttr(kNameSpaceID_None, aAttribute, attrValue);
if (!attrValue.IsEmpty()) {
nsTArray<int8_t>* valueList =
ExtractStyleValues(attrValue, aAttribute, aAllowMultiValues);
// If valueList is null, that indicates a problem with the attribute value.
// Only set properties on a valid attribute value.
if (valueList) {
// The code reading the property assumes that this list is nonempty.
NS_ASSERTION(valueList->Length() >= 1, "valueList should not be empty!");
aFrame->SetProperty(AttributeToProperty(aAttribute), valueList);
} else {
ReportParseError(aFrame, aAttribute->GetUTF16String(), attrValue.get());
}
}
}
// rowspacing
//
// Specifies the distance between successive rows in an mtable. Multiple
// lengths can be specified, each corresponding to its respective position
// between rows. For example:
//
// [ROW_0]
// rowspace_0
// [ROW_1]
// rowspace_1
// [ROW_2]
//
// If the number of row gaps exceeds the number of lengths specified, the final
// specified length is repeated. Additional lengths are ignored.
//
// values: (length)+
// default: 1.0ex
//
// Unitless values are permitted and provide a multiple of the default value
// Negative values are forbidden.
//
// columnspacing
//
// Specifies the distance between successive columns in an mtable. Multiple
// lengths can be specified, each corresponding to its respective position
// between columns. For example:
//
// [COLUMN_0] columnspace_0 [COLUMN_1] columnspace_1 [COLUMN_2]
//
// If the number of column gaps exceeds the number of lengths specified, the
// final specified length is repeated. Additional lengths are ignored.
//
// values: (length)+
// default: 0.8em
//
// Unitless values are permitted and provide a multiple of the default value
// Negative values are forbidden.
//
// framespacing
//
// Specifies the distance between the mtable and its frame (if any). The
// first value specified provides the spacing between the left and right edge
// of the table and the frame, the second value determines the spacing between
// the top and bottom edges and the frame.
//
// An error is reported if only one length is passed. Any additional lengths
// are ignored
//
// values: length length
// default: 0em 0ex If frame attribute is "none" or not specified,
// 0.4em 0.5ex otherwise
//
// Unitless values are permitted and provide a multiple of the default value
// Negative values are forbidden.
//
static const float kDefaultRowspacingEx = 1.0f;
static const float kDefaultColumnspacingEm = 0.8f;
static const float kDefaultFramespacingArg0Em = 0.4f;
static const float kDefaultFramespacingArg1Ex = 0.5f;
static void
ExtractSpacingValues(const nsAString& aString,
nsIAtom* aAttribute,
nsTArray<nscoord>& aSpacingArray,
nsIFrame* aFrame,
nscoord aDefaultValue0,
nscoord aDefaultValue1,
float aFontSizeInflation)
{
nsPresContext* presContext = aFrame->PresContext();
nsStyleContext* styleContext = aFrame->StyleContext();
const char16_t* start = aString.BeginReading();
const char16_t* end = aString.EndReading();
int32_t startIndex = 0;
int32_t count = 0;
int32_t elementNum = 0;
while (start < end) {
// Skip leading spaces.
while ((start < end) && nsCRT::IsAsciiSpace(*start)) {
start++;
startIndex++;
}
// Look for the end of the string, or another space.
while ((start < end) && !nsCRT::IsAsciiSpace(*start)) {
start++;
count++;
}
// Grab the value found and process it.
if (count > 0) {
const nsAString& str = Substring(aString, startIndex, count);
nsAutoString valueString;
valueString.Assign(str);
nscoord newValue;
if (aAttribute == nsGkAtoms::framespacing_ && elementNum) {
newValue = aDefaultValue1;
} else {
newValue = aDefaultValue0;
}
nsMathMLFrame::ParseNumericValue(valueString, &newValue,
nsMathMLElement::PARSE_ALLOW_UNITLESS,
presContext, styleContext,
aFontSizeInflation);
aSpacingArray.AppendElement(newValue);
startIndex += count;
count = 0;
elementNum++;
}
}
}
static void
ParseSpacingAttribute(nsMathMLmtableFrame* aFrame, nsIAtom* aAttribute)
{
NS_ASSERTION(aAttribute == nsGkAtoms::rowspacing_ ||
aAttribute == nsGkAtoms::columnspacing_ ||
aAttribute == nsGkAtoms::framespacing_,
"Non spacing attribute passed");
nsAutoString attrValue;
nsIContent* frameContent = aFrame->GetContent();
frameContent->GetAttr(kNameSpaceID_None, aAttribute, attrValue);
if (nsGkAtoms::framespacing_ == aAttribute) {
nsAutoString frame;
frameContent->GetAttr(kNameSpaceID_None, nsGkAtoms::frame, frame);
if (frame.IsEmpty() || frame.EqualsLiteral("none")) {
aFrame->SetFrameSpacing(0, 0);
return;
}
}
nscoord value;
nscoord value2;
// Set defaults
float fontSizeInflation = nsLayoutUtils::FontSizeInflationFor(aFrame);
RefPtr<nsFontMetrics> fm =
nsLayoutUtils::GetFontMetricsForFrame(aFrame, fontSizeInflation);
if (nsGkAtoms::rowspacing_ == aAttribute) {
value = kDefaultRowspacingEx * fm->XHeight();
value2 = 0;
} else if (nsGkAtoms::columnspacing_ == aAttribute) {
value = kDefaultColumnspacingEm * fm->EmHeight();
value2 = 0;
} else {
value = kDefaultFramespacingArg0Em * fm->EmHeight();
value2 = kDefaultFramespacingArg1Ex * fm->XHeight();
}
nsTArray<nscoord> valueList;
ExtractSpacingValues(attrValue, aAttribute, valueList, aFrame, value, value2,
fontSizeInflation);
if (valueList.Length() == 0) {
if (frameContent->HasAttr(kNameSpaceID_None, aAttribute)) {
ReportParseError(aFrame, aAttribute->GetUTF16String(),
attrValue.get());
}
valueList.AppendElement(value);
}
if (aAttribute == nsGkAtoms::framespacing_) {
if (valueList.Length() == 1) {
if(frameContent->HasAttr(kNameSpaceID_None, aAttribute)) {
ReportParseError(aFrame, aAttribute->GetUTF16String(),
attrValue.get());
}
valueList.AppendElement(value2);
} else if (valueList.Length() != 2) {
ReportParseError(aFrame, aAttribute->GetUTF16String(),
attrValue.get());
}
}
if (aAttribute == nsGkAtoms::rowspacing_) {
aFrame->SetRowSpacingArray(valueList);
} else if (aAttribute == nsGkAtoms::columnspacing_) {
aFrame->SetColSpacingArray(valueList);
} else {
aFrame->SetFrameSpacing(valueList.ElementAt(0),
valueList.ElementAt(1));
}
}
static void ParseSpacingAttributes(nsMathMLmtableFrame* aTableFrame)
{
ParseSpacingAttribute(aTableFrame, nsGkAtoms::rowspacing_);
ParseSpacingAttribute(aTableFrame, nsGkAtoms::columnspacing_);
ParseSpacingAttribute(aTableFrame, nsGkAtoms::framespacing_);
aTableFrame->SetUseCSSSpacing();
}
// map all attributes within a table -- requires the indices of rows and cells.
// so it can only happen after they are made ready by the table base class.
static void
MapAllAttributesIntoCSS(nsMathMLmtableFrame* aTableFrame)
{
// Map mtable rowalign & rowlines.
ParseFrameAttribute(aTableFrame, nsGkAtoms::rowalign_, true);
ParseFrameAttribute(aTableFrame, nsGkAtoms::rowlines_, true);
// Map mtable columnalign & columnlines.
ParseFrameAttribute(aTableFrame, nsGkAtoms::columnalign_, true);
ParseFrameAttribute(aTableFrame, nsGkAtoms::columnlines_, true);
// Map mtable rowspacing, columnspacing & framespacing
ParseSpacingAttributes(aTableFrame);
// mtable is simple and only has one (pseudo) row-group
nsIFrame* rgFrame = aTableFrame->PrincipalChildList().FirstChild();
if (!rgFrame || rgFrame->GetType() != nsGkAtoms::tableRowGroupFrame)
return;
for (nsIFrame* rowFrame : rgFrame->PrincipalChildList()) {
DEBUG_VERIFY_THAT_FRAME_IS(rowFrame, TableRow);
if (rowFrame->GetType() == nsGkAtoms::tableRowFrame) {
// Map row rowalign.
ParseFrameAttribute(rowFrame, nsGkAtoms::rowalign_, false);
// Map row columnalign.
ParseFrameAttribute(rowFrame, nsGkAtoms::columnalign_, true);
for (nsIFrame* cellFrame : rowFrame->PrincipalChildList()) {
DEBUG_VERIFY_THAT_FRAME_IS(cellFrame, TableCell);
if (IS_TABLE_CELL(cellFrame->GetType())) {
// Map cell rowalign.
ParseFrameAttribute(cellFrame, nsGkAtoms::rowalign_, false);
// Map row columnalign.
ParseFrameAttribute(cellFrame, nsGkAtoms::columnalign_, false);
}
}
}
}
}
// the align attribute of mtable can have a row number which indicates
// from where to anchor the table, e.g., top 5 means anchor the table at
// the top of the 5th row, axis -1 means anchor the table on the axis of
// the last row
// The REC says that the syntax is
// '\s*(top|bottom|center|baseline|axis)(\s+-?[0-9]+)?\s*'
// the parsing could have been simpler with that syntax
// but for backward compatibility we make optional
// the whitespaces between the alignment name and the row number
enum eAlign {
eAlign_top,
eAlign_bottom,
eAlign_center,
eAlign_baseline,
eAlign_axis
};
static void
ParseAlignAttribute(nsString& aValue, eAlign& aAlign, int32_t& aRowIndex)
{
// by default, the table is centered about the axis
aRowIndex = 0;
aAlign = eAlign_axis;
int32_t len = 0;
// we only have to remove the leading spaces because
// ToInteger ignores the whitespaces around the number
aValue.CompressWhitespace(true, false);
if (0 == aValue.Find("top")) {
len = 3; // 3 is the length of 'top'
aAlign = eAlign_top;
}
else if (0 == aValue.Find("bottom")) {
len = 6; // 6 is the length of 'bottom'
aAlign = eAlign_bottom;
}
else if (0 == aValue.Find("center")) {
len = 6; // 6 is the length of 'center'
aAlign = eAlign_center;
}
else if (0 == aValue.Find("baseline")) {
len = 8; // 8 is the length of 'baseline'
aAlign = eAlign_baseline;
}
else if (0 == aValue.Find("axis")) {
len = 4; // 4 is the length of 'axis'
aAlign = eAlign_axis;
}
if (len) {
nsresult error;
aValue.Cut(0, len); // aValue is not a const here
aRowIndex = aValue.ToInteger(&error);
if (NS_FAILED(error))
aRowIndex = 0;
}
}
#ifdef DEBUG_rbs_off
// call ListMathMLTree(mParent) to get the big picture
static void
ListMathMLTree(nsIFrame* atLeast)
{
// climb up to <math> or <body> if <math> isn't there
nsIFrame* f = atLeast;
for ( ; f; f = f->GetParent()) {
nsIContent* c = f->GetContent();
if (!c || c->IsMathMLElement(nsGkAtoms::math) ||
c->NodeInfo()->NameAtom(nsGkAtoms::body)) // XXXbaku which kind of body tag?
break;
}
if (!f) f = atLeast;
f->List(stdout, 0);
}
#endif
// --------
// implementation of nsMathMLmtableWrapperFrame
NS_QUERYFRAME_HEAD(nsMathMLmtableWrapperFrame)
NS_QUERYFRAME_ENTRY(nsIMathMLFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsTableWrapperFrame)
nsContainerFrame*
NS_NewMathMLmtableOuterFrame (nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsMathMLmtableWrapperFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmtableWrapperFrame)
nsMathMLmtableWrapperFrame::~nsMathMLmtableWrapperFrame()
{
}
nsresult
nsMathMLmtableWrapperFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
// Attributes specific to <mtable>:
// frame : in mathml.css
// framespacing : here
// groupalign : not yet supported
// equalrows : not yet supported
// equalcolumns : not yet supported
// displaystyle : here and in mathml.css
// align : in reflow
// rowalign : here
// rowlines : here
// rowspacing : here
// columnalign : here
// columnlines : here
// columnspacing : here
// mtable is simple and only has one (pseudo) row-group inside our inner-table
nsIFrame* tableFrame = mFrames.FirstChild();
NS_ASSERTION(tableFrame && tableFrame->GetType() == nsGkAtoms::tableFrame,
"should always have an inner table frame");
nsIFrame* rgFrame = tableFrame->PrincipalChildList().FirstChild();
if (!rgFrame || rgFrame->GetType() != nsGkAtoms::tableRowGroupFrame)
return NS_OK;
// align - just need to issue a dirty (resize) reflow command
if (aAttribute == nsGkAtoms::align) {
PresContext()->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eResize, NS_FRAME_IS_DIRTY);
return NS_OK;
}
// displaystyle - may seem innocuous, but it is actually very harsh --
// like changing an unit. Blow away and recompute all our automatic
// presentational data, and issue a style-changed reflow request
if (aAttribute == nsGkAtoms::displaystyle_) {
nsMathMLContainerFrame::RebuildAutomaticDataForChildren(GetParent());
// Need to reflow the parent, not us, because this can actually
// affect siblings.
PresContext()->PresShell()->
FrameNeedsReflow(GetParent(), nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY);
return NS_OK;
}
// ...and the other attributes affect rows or columns in one way or another
nsPresContext* presContext = tableFrame->PresContext();
if (aAttribute == nsGkAtoms::rowspacing_ ||
aAttribute == nsGkAtoms::columnspacing_ ||
aAttribute == nsGkAtoms::framespacing_ ) {
nsMathMLmtableFrame* mathMLmtableFrame = do_QueryFrame(tableFrame);
if (mathMLmtableFrame) {
ParseSpacingAttribute(mathMLmtableFrame, aAttribute);
mathMLmtableFrame->SetUseCSSSpacing();
}
} else if (aAttribute == nsGkAtoms::rowalign_ ||
aAttribute == nsGkAtoms::rowlines_ ||
aAttribute == nsGkAtoms::columnalign_ ||
aAttribute == nsGkAtoms::columnlines_) {
// clear any cached property list for this table
tableFrame->DeleteProperty(AttributeToProperty(aAttribute));
// Reparse the new attribute on the table.
ParseFrameAttribute(tableFrame, aAttribute, true);
} else {
// Ignore attributes that do not affect layout.
return NS_OK;
}
// Explicitly request a reflow in our subtree to pick up any changes
presContext->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY);
return NS_OK;
}
nsIFrame*
nsMathMLmtableWrapperFrame::GetRowFrameAt(int32_t aRowIndex)
{
int32_t rowCount = GetRowCount();
// Negative indices mean to find upwards from the end.
if (aRowIndex < 0) {
aRowIndex = rowCount + aRowIndex;
} else {
// aRowIndex is 1-based, so convert it to a 0-based index
--aRowIndex;
}
// if our inner table says that the index is valid, find the row now
if (0 <= aRowIndex && aRowIndex <= rowCount) {
nsIFrame* tableFrame = mFrames.FirstChild();
NS_ASSERTION(tableFrame && tableFrame->GetType() == nsGkAtoms::tableFrame,
"should always have an inner table frame");
nsIFrame* rgFrame = tableFrame->PrincipalChildList().FirstChild();
if (!rgFrame || rgFrame->GetType() != nsGkAtoms::tableRowGroupFrame)
return nullptr;
for (nsIFrame* rowFrame : rgFrame->PrincipalChildList()) {
if (aRowIndex == 0) {
DEBUG_VERIFY_THAT_FRAME_IS(rowFrame, TableRow);
if (rowFrame->GetType() != nsGkAtoms::tableRowFrame)
return nullptr;
return rowFrame;
}
--aRowIndex;
}
}
return nullptr;
}
void
nsMathMLmtableWrapperFrame::Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus)
{
nsAutoString value;
// we want to return a table that is anchored according to the align attribute
nsTableWrapperFrame::Reflow(aPresContext, aDesiredSize, aReflowInput, aStatus);
NS_ASSERTION(aDesiredSize.Height() >= 0, "illegal height for mtable");
NS_ASSERTION(aDesiredSize.Width() >= 0, "illegal width for mtable");
// see if the user has set the align attribute on the <mtable>
int32_t rowIndex = 0;
eAlign tableAlign = eAlign_axis;
mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::align, value);
if (!value.IsEmpty()) {
ParseAlignAttribute(value, tableAlign, rowIndex);
}
// adjustments if there is a specified row from where to anchor the table
// (conceptually: when there is no row of reference, picture the table as if
// it is wrapped in a single big fictional row at dy = 0, this way of
// doing so allows us to have a single code path for all cases).
nscoord dy = 0;
WritingMode wm = aDesiredSize.GetWritingMode();
nscoord blockSize = aDesiredSize.BSize(wm);
nsIFrame* rowFrame = nullptr;
if (rowIndex) {
rowFrame = GetRowFrameAt(rowIndex);
if (rowFrame) {
// translate the coordinates to be relative to us and in our writing mode
nsIFrame* frame = rowFrame;
LogicalRect rect(wm, frame->GetRect(),
aReflowInput.ComputedSizeAsContainerIfConstrained());
blockSize = rect.BSize(wm);
do {
dy += rect.BStart(wm);
frame = frame->GetParent();
} while (frame != this);
}
}
switch (tableAlign) {
case eAlign_top:
aDesiredSize.SetBlockStartAscent(dy);
break;
case eAlign_bottom:
aDesiredSize.SetBlockStartAscent(dy + blockSize);
break;
case eAlign_center:
aDesiredSize.SetBlockStartAscent(dy + blockSize / 2);
break;
case eAlign_baseline:
if (rowFrame) {
// anchor the table on the baseline of the row of reference
nscoord rowAscent = ((nsTableRowFrame*)rowFrame)->GetMaxCellAscent();
if (rowAscent) { // the row has at least one cell with 'vertical-align: baseline'
aDesiredSize.SetBlockStartAscent(dy + rowAscent);
break;
}
}
// in other situations, fallback to center
aDesiredSize.SetBlockStartAscent(dy + blockSize / 2);
break;
case eAlign_axis:
default: {
// XXX should instead use style data from the row of reference here ?
RefPtr<nsFontMetrics> fm =
nsLayoutUtils::GetInflatedFontMetricsForFrame(this);
nscoord axisHeight;
GetAxisHeight(aReflowInput.mRenderingContext->GetDrawTarget(), fm, axisHeight);
if (rowFrame) {
// anchor the table on the axis of the row of reference
// XXX fallback to baseline because it is a hard problem
// XXX need to fetch the axis of the row; would need rowalign=axis to work better
nscoord rowAscent = ((nsTableRowFrame*)rowFrame)->GetMaxCellAscent();
if (rowAscent) { // the row has at least one cell with 'vertical-align: baseline'
aDesiredSize.SetBlockStartAscent(dy + rowAscent);
break;
}
}
// in other situations, fallback to using half of the height
aDesiredSize.SetBlockStartAscent(dy + blockSize / 2 + axisHeight);
}
}
mReference.x = 0;
mReference.y = aDesiredSize.BlockStartAscent();
// just make-up a bounding metrics
mBoundingMetrics = nsBoundingMetrics();
mBoundingMetrics.ascent = aDesiredSize.BlockStartAscent();
mBoundingMetrics.descent = aDesiredSize.Height() -
aDesiredSize.BlockStartAscent();
mBoundingMetrics.width = aDesiredSize.Width();
mBoundingMetrics.leftBearing = 0;
mBoundingMetrics.rightBearing = aDesiredSize.Width();
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aDesiredSize);
}
nsContainerFrame*
NS_NewMathMLmtableFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsMathMLmtableFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmtableFrame)
nsMathMLmtableFrame::~nsMathMLmtableFrame()
{
}
void
nsMathMLmtableFrame::SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList)
{
nsTableFrame::SetInitialChildList(aListID, aChildList);
MapAllAttributesIntoCSS(this);
}
void
nsMathMLmtableFrame::RestyleTable()
{
// re-sync MathML specific style data that may have changed
MapAllAttributesIntoCSS(this);
// Explicitly request a re-resolve and reflow in our subtree to pick up any changes
PresContext()->RestyleManager()->
PostRestyleEvent(mContent->AsElement(), eRestyle_Subtree,
nsChangeHint_AllReflowHints);
}
nscoord
nsMathMLmtableFrame::GetColSpacing(int32_t aColIndex)
{
if (mUseCSSSpacing) {
return nsTableFrame::GetColSpacing(aColIndex);
}
if (!mColSpacing.Length()) {
NS_ERROR("mColSpacing should not be empty");
return 0;
}
if (aColIndex < 0 || aColIndex >= GetColCount()) {
NS_ASSERTION(aColIndex == -1 || aColIndex == GetColCount(),
"Desired column beyond bounds of table and border");
return mFrameSpacingX;
}
if ((uint32_t) aColIndex >= mColSpacing.Length()) {
return mColSpacing.LastElement();
}
return mColSpacing.ElementAt(aColIndex);
}
nscoord
nsMathMLmtableFrame::GetColSpacing(int32_t aStartColIndex,
int32_t aEndColIndex)
{
if (mUseCSSSpacing) {
return nsTableFrame::GetColSpacing(aStartColIndex, aEndColIndex);
}
if (aStartColIndex == aEndColIndex) {
return 0;
}
if (!mColSpacing.Length()) {
NS_ERROR("mColSpacing should not be empty");
return 0;
}
nscoord space = 0;
if (aStartColIndex < 0) {
NS_ASSERTION(aStartColIndex == -1,
"Desired column beyond bounds of table and border");
space += mFrameSpacingX;
aStartColIndex = 0;
}
if (aEndColIndex >= GetColCount()) {
NS_ASSERTION(aEndColIndex == GetColCount(),
"Desired column beyond bounds of table and border");
space += mFrameSpacingX;
aEndColIndex = GetColCount();
}
// Only iterate over column spacing when there is the potential to vary
int32_t min = std::min(aEndColIndex, (int32_t) mColSpacing.Length());
for (int32_t i = aStartColIndex; i < min; i++) {
space += mColSpacing.ElementAt(i);
}
// The remaining values are constant. Note that if there are more
// column spacings specified than there are columns, LastElement() will be
// multiplied by 0, so it is still safe to use.
space += (aEndColIndex - min) * mColSpacing.LastElement();
return space;
}
nscoord
nsMathMLmtableFrame::GetRowSpacing(int32_t aRowIndex)
{
if (mUseCSSSpacing) {
return nsTableFrame::GetRowSpacing(aRowIndex);
}
if (!mRowSpacing.Length()) {
NS_ERROR("mRowSpacing should not be empty");
return 0;
}
if (aRowIndex < 0 || aRowIndex >= GetRowCount()) {
NS_ASSERTION(aRowIndex == -1 || aRowIndex == GetRowCount(),
"Desired row beyond bounds of table and border");
return mFrameSpacingY;
}
if ((uint32_t) aRowIndex >= mRowSpacing.Length()) {
return mRowSpacing.LastElement();
}
return mRowSpacing.ElementAt(aRowIndex);
}
nscoord
nsMathMLmtableFrame::GetRowSpacing(int32_t aStartRowIndex,
int32_t aEndRowIndex)
{
if (mUseCSSSpacing) {
return nsTableFrame::GetRowSpacing(aStartRowIndex, aEndRowIndex);
}
if (aStartRowIndex == aEndRowIndex) {
return 0;
}
if (!mRowSpacing.Length()) {
NS_ERROR("mRowSpacing should not be empty");
return 0;
}
nscoord space = 0;
if (aStartRowIndex < 0) {
NS_ASSERTION(aStartRowIndex == -1,
"Desired row beyond bounds of table and border");
space += mFrameSpacingY;
aStartRowIndex = 0;
}
if (aEndRowIndex >= GetRowCount()) {
NS_ASSERTION(aEndRowIndex == GetRowCount(),
"Desired row beyond bounds of table and border");
space += mFrameSpacingY;
aEndRowIndex = GetRowCount();
}
// Only iterate over row spacing when there is the potential to vary
int32_t min = std::min(aEndRowIndex, (int32_t) mRowSpacing.Length());
for (int32_t i = aStartRowIndex; i < min; i++) {
space += mRowSpacing.ElementAt(i);
}
// The remaining values are constant. Note that if there are more
// row spacings specified than there are row, LastElement() will be
// multiplied by 0, so it is still safe to use.
space += (aEndRowIndex - min) * mRowSpacing.LastElement();
return space;
}
void
nsMathMLmtableFrame::SetUseCSSSpacing()
{
mUseCSSSpacing =
!(mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::rowspacing_) ||
mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::columnspacing_) ||
mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::framespacing_));
}
NS_QUERYFRAME_HEAD(nsMathMLmtableFrame)
NS_QUERYFRAME_ENTRY(nsMathMLmtableFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsTableFrame)
// --------
// implementation of nsMathMLmtrFrame
nsContainerFrame*
NS_NewMathMLmtrFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsMathMLmtrFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmtrFrame)
nsMathMLmtrFrame::~nsMathMLmtrFrame()
{
}
nsresult
nsMathMLmtrFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
// Attributes specific to <mtr>:
// groupalign : Not yet supported.
// rowalign : Here
// columnalign : Here
nsPresContext* presContext = PresContext();
if (aAttribute != nsGkAtoms::rowalign_ &&
aAttribute != nsGkAtoms::columnalign_) {
return NS_OK;
}
DeleteProperty(AttributeToProperty(aAttribute));
bool allowMultiValues = (aAttribute == nsGkAtoms::columnalign_);
// Reparse the new attribute.
ParseFrameAttribute(this, aAttribute, allowMultiValues);
// Explicitly request a reflow in our subtree to pick up any changes
presContext->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY);
return NS_OK;
}
// --------
// implementation of nsMathMLmtdFrame
nsContainerFrame*
NS_NewMathMLmtdFrame(nsIPresShell* aPresShell,
nsStyleContext* aContext,
nsTableFrame* aTableFrame)
{
return new (aPresShell) nsMathMLmtdFrame(aContext, aTableFrame);
}
NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmtdFrame)
nsMathMLmtdFrame::~nsMathMLmtdFrame()
{
}
void
nsMathMLmtdFrame::Init(nsIContent* aContent,
nsContainerFrame* aParent,
nsIFrame* aPrevInFlow)
{
nsTableCellFrame::Init(aContent, aParent, aPrevInFlow);
// We want to use the ancestor <math> element's font inflation to avoid
// individual cells having their own varying font inflation.
RemoveStateBits(NS_FRAME_FONT_INFLATION_FLOW_ROOT);
}
nsresult
nsMathMLmtdFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
// Attributes specific to <mtd>:
// groupalign : Not yet supported
// rowalign : here
// columnalign : here
// rowspan : here
// columnspan : here
if (aAttribute == nsGkAtoms::rowalign_ ||
aAttribute == nsGkAtoms::columnalign_) {
DeleteProperty(AttributeToProperty(aAttribute));
// Reparse the attribute.
ParseFrameAttribute(this, aAttribute, false);
return NS_OK;
}
if (aAttribute == nsGkAtoms::rowspan ||
aAttribute == nsGkAtoms::columnspan_) {
// use the naming expected by the base class
if (aAttribute == nsGkAtoms::columnspan_)
aAttribute = nsGkAtoms::colspan;
return nsTableCellFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
}
return NS_OK;
}
uint8_t
nsMathMLmtdFrame::GetVerticalAlign() const
{
// Set the default alignment in case no alignment was specified
uint8_t alignment = nsTableCellFrame::GetVerticalAlign();
nsTArray<int8_t>* alignmentList = FindCellProperty(this, RowAlignProperty());
if (alignmentList) {
uint32_t rowIndex = RowIndex();
// If the row number is greater than the number of provided rowalign values,
// we simply repeat the last value.
if (rowIndex < alignmentList->Length())
alignment = alignmentList->ElementAt(rowIndex);
else
alignment = alignmentList->ElementAt(alignmentList->Length() - 1);
}
return alignment;
}
nsresult
nsMathMLmtdFrame::ProcessBorders(nsTableFrame* aFrame,
nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists)
{
aLists.BorderBackground()->AppendNewToTop(new (aBuilder)
nsDisplaymtdBorder(aBuilder, this));
return NS_OK;
}
LogicalMargin
nsMathMLmtdFrame::GetBorderWidth(WritingMode aWM) const
{
nsStyleBorder styleBorder = *StyleBorder();
ApplyBorderToStyle(this, styleBorder);
return LogicalMargin(aWM, styleBorder.GetComputedBorder());
}
nsMargin
nsMathMLmtdFrame::GetBorderOverflow()
{
nsStyleBorder styleBorder = *StyleBorder();
ApplyBorderToStyle(this, styleBorder);
nsMargin overflow = ComputeBorderOverflow(this, styleBorder);
return overflow;
}
// --------
// implementation of nsMathMLmtdInnerFrame
NS_QUERYFRAME_HEAD(nsMathMLmtdInnerFrame)
NS_QUERYFRAME_ENTRY(nsIMathMLFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsBlockFrame)
nsContainerFrame*
NS_NewMathMLmtdInnerFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsMathMLmtdInnerFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmtdInnerFrame)
nsMathMLmtdInnerFrame::nsMathMLmtdInnerFrame(nsStyleContext* aContext)
: nsBlockFrame(aContext)
{
// Make a copy of the parent nsStyleText for later modification.
mUniqueStyleText = new (PresContext()) nsStyleText(*StyleText());
}
nsMathMLmtdInnerFrame::~nsMathMLmtdInnerFrame()
{
mUniqueStyleText->Destroy(PresContext());
}
void
nsMathMLmtdInnerFrame::Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus)
{
// Let the base class do the reflow
nsBlockFrame::Reflow(aPresContext, aDesiredSize, aReflowInput, aStatus);
// more about <maligngroup/> and <malignmark/> later
// ...
}
const
nsStyleText* nsMathMLmtdInnerFrame::StyleTextForLineLayout()
{
// Set the default alignment in case nothing was specified
uint8_t alignment = StyleText()->mTextAlign;
nsTArray<int8_t>* alignmentList =
FindCellProperty(this, ColumnAlignProperty());
if (alignmentList) {
nsMathMLmtdFrame* cellFrame = (nsMathMLmtdFrame*)GetParent();
uint32_t columnIndex = cellFrame->ColIndex();
// If the column number is greater than the number of provided columalign
// values, we simply repeat the last value.
if (columnIndex < alignmentList->Length())
alignment = alignmentList->ElementAt(columnIndex);
else
alignment = alignmentList->ElementAt(alignmentList->Length() - 1);
}
mUniqueStyleText->mTextAlign = alignment;
return mUniqueStyleText;
}
/* virtual */ void
nsMathMLmtdInnerFrame::DidSetStyleContext(nsStyleContext* aOldStyleContext)
{
nsBlockFrame::DidSetStyleContext(aOldStyleContext);
mUniqueStyleText->Destroy(PresContext());
mUniqueStyleText = new (PresContext()) nsStyleText(*StyleText());
}
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