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gecko/accessible/html/HTMLTableAccessible.cpp
Alexander Surkov 1f22c9eeb2 Bug 1248840 - rename TreeWalker::NextChild, r=yzen
2016-02-18 17:57:17 -05:00

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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 "HTMLTableAccessible.h"
#include "mozilla/DebugOnly.h"
#include "Accessible-inl.h"
#include "nsAccessibilityService.h"
#include "nsAccUtils.h"
#include "DocAccessible.h"
#include "nsTextEquivUtils.h"
#include "Relation.h"
#include "Role.h"
#include "States.h"
#include "TreeWalker.h"
#include "mozilla/dom/HTMLTableElement.h"
#include "nsIDOMElement.h"
#include "nsIDOMRange.h"
#include "nsISelectionPrivate.h"
#include "nsIDOMNodeList.h"
#include "nsIDOMHTMLCollection.h"
#include "nsIDocument.h"
#include "nsIMutableArray.h"
#include "nsIPersistentProperties2.h"
#include "nsIPresShell.h"
#include "nsITableCellLayout.h"
#include "nsFrameSelection.h"
#include "nsError.h"
#include "nsArrayUtils.h"
#include "nsComponentManagerUtils.h"
#include "nsNameSpaceManager.h"
#include "nsTableCellFrame.h"
#include "nsTableOuterFrame.h"
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::a11y;
////////////////////////////////////////////////////////////////////////////////
// HTMLTableCellAccessible
////////////////////////////////////////////////////////////////////////////////
HTMLTableCellAccessible::
HTMLTableCellAccessible(nsIContent* aContent, DocAccessible* aDoc) :
HyperTextAccessibleWrap(aContent, aDoc)
{
mType = eHTMLTableCellType;
mGenericTypes |= eTableCell;
}
NS_IMPL_ISUPPORTS_INHERITED0(HTMLTableCellAccessible, HyperTextAccessible)
////////////////////////////////////////////////////////////////////////////////
// HTMLTableCellAccessible: Accessible implementation
role
HTMLTableCellAccessible::NativeRole()
{
if (mContent->IsMathMLElement(nsGkAtoms::mtd_)) {
return roles::MATHML_CELL;
}
return roles::CELL;
}
uint64_t
HTMLTableCellAccessible::NativeState()
{
uint64_t state = HyperTextAccessibleWrap::NativeState();
nsIFrame *frame = mContent->GetPrimaryFrame();
NS_ASSERTION(frame, "No frame for valid cell accessible!");
if (frame && frame->IsSelected())
state |= states::SELECTED;
return state;
}
uint64_t
HTMLTableCellAccessible::NativeInteractiveState() const
{
return HyperTextAccessibleWrap::NativeInteractiveState() | states::SELECTABLE;
}
already_AddRefed<nsIPersistentProperties>
HTMLTableCellAccessible::NativeAttributes()
{
nsCOMPtr<nsIPersistentProperties> attributes =
HyperTextAccessibleWrap::NativeAttributes();
// table-cell-index attribute
TableAccessible* table = Table();
if (!table)
return attributes.forget();
int32_t rowIdx = -1, colIdx = -1;
nsresult rv = GetCellIndexes(rowIdx, colIdx);
if (NS_FAILED(rv))
return attributes.forget();
nsAutoString stringIdx;
stringIdx.AppendInt(table->CellIndexAt(rowIdx, colIdx));
nsAccUtils::SetAccAttr(attributes, nsGkAtoms::tableCellIndex, stringIdx);
// abbr attribute
// Pick up object attribute from abbr DOM element (a child of the cell) or
// from abbr DOM attribute.
nsAutoString abbrText;
if (ChildCount() == 1) {
Accessible* abbr = FirstChild();
if (abbr->IsAbbreviation()) {
nsIContent* firstChildNode = abbr->GetContent()->GetFirstChild();
if (firstChildNode) {
nsTextEquivUtils::
AppendTextEquivFromTextContent(firstChildNode, &abbrText);
}
}
}
if (abbrText.IsEmpty())
mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::abbr, abbrText);
if (!abbrText.IsEmpty())
nsAccUtils::SetAccAttr(attributes, nsGkAtoms::abbr, abbrText);
// axis attribute
nsAutoString axisText;
mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::axis, axisText);
if (!axisText.IsEmpty())
nsAccUtils::SetAccAttr(attributes, nsGkAtoms::axis, axisText);
#ifdef DEBUG
nsAutoString unused;
attributes->SetStringProperty(NS_LITERAL_CSTRING("cppclass"),
NS_LITERAL_STRING("HTMLTableCellAccessible"),
unused);
#endif
return attributes.forget();
}
GroupPos
HTMLTableCellAccessible::GroupPosition()
{
int32_t count = 0, index = 0;
TableAccessible* table = Table();
if (table && nsCoreUtils::GetUIntAttr(table->AsAccessible()->GetContent(),
nsGkAtoms::aria_colcount, &count) &&
nsCoreUtils::GetUIntAttr(mContent, nsGkAtoms::aria_colindex, &index)) {
return GroupPos(0, index, count);
}
return HyperTextAccessibleWrap::GroupPosition();
}
////////////////////////////////////////////////////////////////////////////////
// HTMLTableCellAccessible: TableCellAccessible implementation
TableAccessible*
HTMLTableCellAccessible::Table() const
{
Accessible* parent = const_cast<HTMLTableCellAccessible*>(this);
while ((parent = parent->Parent())) {
if (parent->IsTable())
return parent->AsTable();
}
return nullptr;
}
uint32_t
HTMLTableCellAccessible::ColIdx() const
{
nsITableCellLayout* cellLayout = GetCellLayout();
NS_ENSURE_TRUE(cellLayout, 0);
int32_t colIdx = 0;
cellLayout->GetColIndex(colIdx);
return colIdx > 0 ? static_cast<uint32_t>(colIdx) : 0;
}
uint32_t
HTMLTableCellAccessible::RowIdx() const
{
nsITableCellLayout* cellLayout = GetCellLayout();
NS_ENSURE_TRUE(cellLayout, 0);
int32_t rowIdx = 0;
cellLayout->GetRowIndex(rowIdx);
return rowIdx > 0 ? static_cast<uint32_t>(rowIdx) : 0;
}
uint32_t
HTMLTableCellAccessible::ColExtent() const
{
int32_t rowIdx = -1, colIdx = -1;
GetCellIndexes(rowIdx, colIdx);
TableAccessible* table = Table();
NS_ASSERTION(table, "cell not in a table!");
if (!table)
return 0;
return table->ColExtentAt(rowIdx, colIdx);
}
uint32_t
HTMLTableCellAccessible::RowExtent() const
{
int32_t rowIdx = -1, colIdx = -1;
GetCellIndexes(rowIdx, colIdx);
TableAccessible* table = Table();
NS_ASSERTION(table, "cell not in atable!");
if (!table)
return 0;
return table->RowExtentAt(rowIdx, colIdx);
}
void
HTMLTableCellAccessible::ColHeaderCells(nsTArray<Accessible*>* aCells)
{
IDRefsIterator itr(mDoc, mContent, nsGkAtoms::headers);
while (Accessible* cell = itr.Next()) {
a11y::role cellRole = cell->Role();
if (cellRole == roles::COLUMNHEADER) {
aCells->AppendElement(cell);
} else if (cellRole != roles::ROWHEADER) {
// If referred table cell is at the same column then treat it as a column
// header.
TableCellAccessible* tableCell = cell->AsTableCell();
if (tableCell && tableCell->ColIdx() == ColIdx())
aCells->AppendElement(cell);
}
}
if (aCells->IsEmpty())
TableCellAccessible::ColHeaderCells(aCells);
}
void
HTMLTableCellAccessible::RowHeaderCells(nsTArray<Accessible*>* aCells)
{
IDRefsIterator itr(mDoc, mContent, nsGkAtoms::headers);
while (Accessible* cell = itr.Next()) {
a11y::role cellRole = cell->Role();
if (cellRole == roles::ROWHEADER) {
aCells->AppendElement(cell);
} else if (cellRole != roles::COLUMNHEADER) {
// If referred table cell is at the same row then treat it as a column
// header.
TableCellAccessible* tableCell = cell->AsTableCell();
if (tableCell && tableCell->RowIdx() == RowIdx())
aCells->AppendElement(cell);
}
}
if (aCells->IsEmpty())
TableCellAccessible::RowHeaderCells(aCells);
}
bool
HTMLTableCellAccessible::Selected()
{
int32_t rowIdx = -1, colIdx = -1;
GetCellIndexes(rowIdx, colIdx);
TableAccessible* table = Table();
NS_ENSURE_TRUE(table, false);
return table->IsCellSelected(rowIdx, colIdx);
}
////////////////////////////////////////////////////////////////////////////////
// HTMLTableCellAccessible: protected implementation
nsITableCellLayout*
HTMLTableCellAccessible::GetCellLayout() const
{
return do_QueryFrame(mContent->GetPrimaryFrame());
}
nsresult
HTMLTableCellAccessible::GetCellIndexes(int32_t& aRowIdx, int32_t& aColIdx) const
{
nsITableCellLayout *cellLayout = GetCellLayout();
NS_ENSURE_STATE(cellLayout);
return cellLayout->GetCellIndexes(aRowIdx, aColIdx);
}
////////////////////////////////////////////////////////////////////////////////
// HTMLTableHeaderCellAccessible
////////////////////////////////////////////////////////////////////////////////
HTMLTableHeaderCellAccessible::
HTMLTableHeaderCellAccessible(nsIContent* aContent, DocAccessible* aDoc) :
HTMLTableCellAccessible(aContent, aDoc)
{
}
////////////////////////////////////////////////////////////////////////////////
// HTMLTableHeaderCellAccessible: Accessible implementation
role
HTMLTableHeaderCellAccessible::NativeRole()
{
// Check value of @scope attribute.
static nsIContent::AttrValuesArray scopeValues[] =
{ &nsGkAtoms::col, &nsGkAtoms::colgroup,
&nsGkAtoms::row, &nsGkAtoms::rowgroup, nullptr };
int32_t valueIdx =
mContent->FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::scope,
scopeValues, eCaseMatters);
switch (valueIdx) {
case 0:
case 1:
return roles::COLUMNHEADER;
case 2:
case 3:
return roles::ROWHEADER;
}
TableAccessible* table = Table();
if (!table)
return roles::NOTHING;
// If the cell next to this one is not a header cell then assume this cell is
// a row header for it.
uint32_t rowIdx = RowIdx(), colIdx = ColIdx();
Accessible* cell = table->CellAt(rowIdx, colIdx + ColExtent());
if (cell && !nsCoreUtils::IsHTMLTableHeader(cell->GetContent()))
return roles::ROWHEADER;
// If the cell below this one is not a header cell then assume this cell is
// a column header for it.
uint32_t rowExtent = RowExtent();
cell = table->CellAt(rowIdx + rowExtent, colIdx);
if (cell && !nsCoreUtils::IsHTMLTableHeader(cell->GetContent()))
return roles::COLUMNHEADER;
// Otherwise if this cell is surrounded by header cells only then make a guess
// based on its cell spanning. In other words if it is row spanned then assume
// it's a row header, otherwise it's a column header.
return rowExtent > 1 ? roles::ROWHEADER : roles::COLUMNHEADER;
}
////////////////////////////////////////////////////////////////////////////////
// HTMLTableRowAccessible
////////////////////////////////////////////////////////////////////////////////
NS_IMPL_ISUPPORTS_INHERITED0(HTMLTableRowAccessible, Accessible)
role
HTMLTableRowAccessible::NativeRole()
{
if (mContent->IsMathMLElement(nsGkAtoms::mtr_)) {
return roles::MATHML_TABLE_ROW;
} else if (mContent->IsMathMLElement(nsGkAtoms::mlabeledtr_)) {
return roles::MATHML_LABELED_ROW;
}
return roles::ROW;
}
GroupPos
HTMLTableRowAccessible::GroupPosition()
{
int32_t count = 0, index = 0;
Accessible* table = nsAccUtils::TableFor(this);
if (table && nsCoreUtils::GetUIntAttr(table->GetContent(),
nsGkAtoms::aria_rowcount, &count) &&
nsCoreUtils::GetUIntAttr(mContent, nsGkAtoms::aria_rowindex, &index)) {
return GroupPos(0, index, count);
}
return AccessibleWrap::GroupPosition();
}
////////////////////////////////////////////////////////////////////////////////
// HTMLTableAccessible
////////////////////////////////////////////////////////////////////////////////
NS_IMPL_ISUPPORTS_INHERITED0(HTMLTableAccessible, Accessible)
////////////////////////////////////////////////////////////////////////////////
// HTMLTableAccessible: Accessible
void
HTMLTableAccessible::CacheChildren()
{
// Move caption accessible so that it's the first child. Check for the first
// caption only, because nsAccessibilityService ensures we don't create
// accessibles for the other captions, since only the first is actually
// visible.
TreeWalker walker(this, mContent);
Accessible* child = nullptr;
while ((child = walker.Next())) {
if (child->Role() == roles::CAPTION) {
InsertChildAt(0, child);
while ((child = walker.Next()) && AppendChild(child));
break;
}
AppendChild(child);
}
}
role
HTMLTableAccessible::NativeRole()
{
if (mContent->IsMathMLElement(nsGkAtoms::mtable_)) {
return roles::MATHML_TABLE;
}
return roles::TABLE;
}
uint64_t
HTMLTableAccessible::NativeState()
{
return Accessible::NativeState() | states::READONLY;
}
ENameValueFlag
HTMLTableAccessible::NativeName(nsString& aName)
{
ENameValueFlag nameFlag = Accessible::NativeName(aName);
if (!aName.IsEmpty())
return nameFlag;
// Use table caption as a name.
Accessible* caption = Caption();
if (caption) {
nsIContent* captionContent = caption->GetContent();
if (captionContent) {
nsTextEquivUtils::AppendTextEquivFromContent(this, captionContent, &aName);
if (!aName.IsEmpty())
return eNameOK;
}
}
// If no caption then use summary as a name.
mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::summary, aName);
return eNameOK;
}
already_AddRefed<nsIPersistentProperties>
HTMLTableAccessible::NativeAttributes()
{
nsCOMPtr<nsIPersistentProperties> attributes =
AccessibleWrap::NativeAttributes();
if (mContent->IsMathMLElement(nsGkAtoms::mtable_)) {
GetAccService()->MarkupAttributes(mContent, attributes);
}
if (IsProbablyLayoutTable()) {
nsAutoString unused;
attributes->SetStringProperty(NS_LITERAL_CSTRING("layout-guess"),
NS_LITERAL_STRING("true"), unused);
}
return attributes.forget();
}
////////////////////////////////////////////////////////////////////////////////
// HTMLTableAccessible: Accessible
Relation
HTMLTableAccessible::RelationByType(RelationType aType)
{
Relation rel = AccessibleWrap::RelationByType(aType);
if (aType == RelationType::LABELLED_BY)
rel.AppendTarget(Caption());
return rel;
}
////////////////////////////////////////////////////////////////////////////////
// HTMLTableAccessible: Table
Accessible*
HTMLTableAccessible::Caption() const
{
Accessible* child = mChildren.SafeElementAt(0, nullptr);
return child && child->Role() == roles::CAPTION ? child : nullptr;
}
void
HTMLTableAccessible::Summary(nsString& aSummary)
{
dom::HTMLTableElement* table = dom::HTMLTableElement::FromContent(mContent);
if (table)
table->GetSummary(aSummary);
}
uint32_t
HTMLTableAccessible::ColCount()
{
nsTableOuterFrame* tableFrame = do_QueryFrame(mContent->GetPrimaryFrame());
return tableFrame ? tableFrame->GetColCount() : 0;
}
uint32_t
HTMLTableAccessible::RowCount()
{
nsTableOuterFrame* tableFrame = do_QueryFrame(mContent->GetPrimaryFrame());
return tableFrame ? tableFrame->GetRowCount() : 0;
}
uint32_t
HTMLTableAccessible::SelectedCellCount()
{
nsTableOuterFrame* tableFrame = do_QueryFrame(mContent->GetPrimaryFrame());
if (!tableFrame)
return 0;
uint32_t count = 0, rowCount = RowCount(), colCount = ColCount();
for (uint32_t rowIdx = 0; rowIdx < rowCount; rowIdx++) {
for (uint32_t colIdx = 0; colIdx < colCount; colIdx++) {
nsTableCellFrame* cellFrame = tableFrame->GetCellFrameAt(rowIdx, colIdx);
if (!cellFrame || !cellFrame->IsSelected())
continue;
int32_t startRow = -1, startCol = -1;
cellFrame->GetRowIndex(startRow);
cellFrame->GetColIndex(startCol);
if (startRow >= 0 && (uint32_t)startRow == rowIdx &&
startCol >= 0 && (uint32_t)startCol == colIdx)
count++;
}
}
return count;
}
uint32_t
HTMLTableAccessible::SelectedColCount()
{
uint32_t count = 0, colCount = ColCount();
for (uint32_t colIdx = 0; colIdx < colCount; colIdx++)
if (IsColSelected(colIdx))
count++;
return count;
}
uint32_t
HTMLTableAccessible::SelectedRowCount()
{
uint32_t count = 0, rowCount = RowCount();
for (uint32_t rowIdx = 0; rowIdx < rowCount; rowIdx++)
if (IsRowSelected(rowIdx))
count++;
return count;
}
void
HTMLTableAccessible::SelectedCells(nsTArray<Accessible*>* aCells)
{
nsTableOuterFrame* tableFrame = do_QueryFrame(mContent->GetPrimaryFrame());
if (!tableFrame)
return;
uint32_t rowCount = RowCount(), colCount = ColCount();
for (uint32_t rowIdx = 0; rowIdx < rowCount; rowIdx++) {
for (uint32_t colIdx = 0; colIdx < colCount; colIdx++) {
nsTableCellFrame* cellFrame = tableFrame->GetCellFrameAt(rowIdx, colIdx);
if (!cellFrame || !cellFrame->IsSelected())
continue;
int32_t startCol = -1, startRow = -1;
cellFrame->GetRowIndex(startRow);
cellFrame->GetColIndex(startCol);
if ((startRow >= 0 && (uint32_t)startRow != rowIdx) ||
(startCol >= 0 && (uint32_t)startCol != colIdx))
continue;
Accessible* cell = mDoc->GetAccessible(cellFrame->GetContent());
aCells->AppendElement(cell);
}
}
}
void
HTMLTableAccessible::SelectedCellIndices(nsTArray<uint32_t>* aCells)
{
nsTableOuterFrame* tableFrame = do_QueryFrame(mContent->GetPrimaryFrame());
if (!tableFrame)
return;
uint32_t rowCount = RowCount(), colCount = ColCount();
for (uint32_t rowIdx = 0; rowIdx < rowCount; rowIdx++) {
for (uint32_t colIdx = 0; colIdx < colCount; colIdx++) {
nsTableCellFrame* cellFrame = tableFrame->GetCellFrameAt(rowIdx, colIdx);
if (!cellFrame || !cellFrame->IsSelected())
continue;
int32_t startRow = -1, startCol = -1;
cellFrame->GetColIndex(startCol);
cellFrame->GetRowIndex(startRow);
if (startRow >= 0 && (uint32_t)startRow == rowIdx &&
startCol >= 0 && (uint32_t)startCol == colIdx)
aCells->AppendElement(CellIndexAt(rowIdx, colIdx));
}
}
}
void
HTMLTableAccessible::SelectedColIndices(nsTArray<uint32_t>* aCols)
{
uint32_t colCount = ColCount();
for (uint32_t colIdx = 0; colIdx < colCount; colIdx++)
if (IsColSelected(colIdx))
aCols->AppendElement(colIdx);
}
void
HTMLTableAccessible::SelectedRowIndices(nsTArray<uint32_t>* aRows)
{
uint32_t rowCount = RowCount();
for (uint32_t rowIdx = 0; rowIdx < rowCount; rowIdx++)
if (IsRowSelected(rowIdx))
aRows->AppendElement(rowIdx);
}
Accessible*
HTMLTableAccessible::CellAt(uint32_t aRowIdx, uint32_t aColIdx)
{
nsTableOuterFrame* tableFrame = do_QueryFrame(mContent->GetPrimaryFrame());
if (!tableFrame)
return nullptr;
nsIContent* cellContent = tableFrame->GetCellAt(aRowIdx, aColIdx);
Accessible* cell = mDoc->GetAccessible(cellContent);
// XXX bug 576838: crazy tables (like table6 in tables/test_table2.html) may
// return itself as a cell what makes Orca hang.
return cell == this ? nullptr : cell;
}
int32_t
HTMLTableAccessible::CellIndexAt(uint32_t aRowIdx, uint32_t aColIdx)
{
nsTableOuterFrame* tableFrame = do_QueryFrame(mContent->GetPrimaryFrame());
if (!tableFrame)
return -1;
return tableFrame->GetIndexByRowAndColumn(aRowIdx, aColIdx);
}
int32_t
HTMLTableAccessible::ColIndexAt(uint32_t aCellIdx)
{
nsTableOuterFrame* tableFrame = do_QueryFrame(mContent->GetPrimaryFrame());
if (!tableFrame)
return -1;
int32_t rowIdx = -1, colIdx = -1;
tableFrame->GetRowAndColumnByIndex(aCellIdx, &rowIdx, &colIdx);
return colIdx;
}
int32_t
HTMLTableAccessible::RowIndexAt(uint32_t aCellIdx)
{
nsTableOuterFrame* tableFrame = do_QueryFrame(mContent->GetPrimaryFrame());
if (!tableFrame)
return -1;
int32_t rowIdx = -1, colIdx = -1;
tableFrame->GetRowAndColumnByIndex(aCellIdx, &rowIdx, &colIdx);
return rowIdx;
}
void
HTMLTableAccessible::RowAndColIndicesAt(uint32_t aCellIdx, int32_t* aRowIdx,
int32_t* aColIdx)
{
nsTableOuterFrame* tableFrame = do_QueryFrame(mContent->GetPrimaryFrame());
if (tableFrame)
tableFrame->GetRowAndColumnByIndex(aCellIdx, aRowIdx, aColIdx);
}
uint32_t
HTMLTableAccessible::ColExtentAt(uint32_t aRowIdx, uint32_t aColIdx)
{
nsTableOuterFrame* tableFrame = do_QueryFrame(mContent->GetPrimaryFrame());
if (!tableFrame)
return 0;
return tableFrame->GetEffectiveColSpanAt(aRowIdx, aColIdx);
}
uint32_t
HTMLTableAccessible::RowExtentAt(uint32_t aRowIdx, uint32_t aColIdx)
{
nsTableOuterFrame* tableFrame = do_QueryFrame(mContent->GetPrimaryFrame());
if (!tableFrame)
return 0;
return tableFrame->GetEffectiveRowSpanAt(aRowIdx, aColIdx);
}
bool
HTMLTableAccessible::IsColSelected(uint32_t aColIdx)
{
bool isSelected = false;
uint32_t rowCount = RowCount();
for (uint32_t rowIdx = 0; rowIdx < rowCount; rowIdx++) {
isSelected = IsCellSelected(rowIdx, aColIdx);
if (!isSelected)
return false;
}
return isSelected;
}
bool
HTMLTableAccessible::IsRowSelected(uint32_t aRowIdx)
{
bool isSelected = false;
uint32_t colCount = ColCount();
for (uint32_t colIdx = 0; colIdx < colCount; colIdx++) {
isSelected = IsCellSelected(aRowIdx, colIdx);
if (!isSelected)
return false;
}
return isSelected;
}
bool
HTMLTableAccessible::IsCellSelected(uint32_t aRowIdx, uint32_t aColIdx)
{
nsTableOuterFrame* tableFrame = do_QueryFrame(mContent->GetPrimaryFrame());
if (!tableFrame)
return false;
nsTableCellFrame* cellFrame = tableFrame->GetCellFrameAt(aRowIdx, aColIdx);
return cellFrame ? cellFrame->IsSelected() : false;
}
void
HTMLTableAccessible::SelectRow(uint32_t aRowIdx)
{
DebugOnly<nsresult> rv =
RemoveRowsOrColumnsFromSelection(aRowIdx,
nsISelectionPrivate::TABLESELECTION_ROW,
true);
NS_ASSERTION(NS_SUCCEEDED(rv),
"RemoveRowsOrColumnsFromSelection() Shouldn't fail!");
AddRowOrColumnToSelection(aRowIdx, nsISelectionPrivate::TABLESELECTION_ROW);
}
void
HTMLTableAccessible::SelectCol(uint32_t aColIdx)
{
DebugOnly<nsresult> rv =
RemoveRowsOrColumnsFromSelection(aColIdx,
nsISelectionPrivate::TABLESELECTION_COLUMN,
true);
NS_ASSERTION(NS_SUCCEEDED(rv),
"RemoveRowsOrColumnsFromSelection() Shouldn't fail!");
AddRowOrColumnToSelection(aColIdx, nsISelectionPrivate::TABLESELECTION_COLUMN);
}
void
HTMLTableAccessible::UnselectRow(uint32_t aRowIdx)
{
RemoveRowsOrColumnsFromSelection(aRowIdx,
nsISelectionPrivate::TABLESELECTION_ROW,
false);
}
void
HTMLTableAccessible::UnselectCol(uint32_t aColIdx)
{
RemoveRowsOrColumnsFromSelection(aColIdx,
nsISelectionPrivate::TABLESELECTION_COLUMN,
false);
}
nsresult
HTMLTableAccessible::AddRowOrColumnToSelection(int32_t aIndex, uint32_t aTarget)
{
bool doSelectRow = (aTarget == nsISelectionPrivate::TABLESELECTION_ROW);
nsTableOuterFrame* tableFrame = do_QueryFrame(mContent->GetPrimaryFrame());
if (!tableFrame)
return NS_OK;
uint32_t count = 0;
if (doSelectRow)
count = ColCount();
else
count = RowCount();
nsIPresShell* presShell(mDoc->PresShell());
RefPtr<nsFrameSelection> tableSelection =
const_cast<nsFrameSelection*>(presShell->ConstFrameSelection());
for (uint32_t idx = 0; idx < count; idx++) {
int32_t rowIdx = doSelectRow ? aIndex : idx;
int32_t colIdx = doSelectRow ? idx : aIndex;
nsTableCellFrame* cellFrame = tableFrame->GetCellFrameAt(rowIdx, colIdx);
if (cellFrame && !cellFrame->IsSelected()) {
nsresult rv = tableSelection->SelectCellElement(cellFrame->GetContent());
NS_ENSURE_SUCCESS(rv, rv);
}
}
return NS_OK;
}
nsresult
HTMLTableAccessible::RemoveRowsOrColumnsFromSelection(int32_t aIndex,
uint32_t aTarget,
bool aIsOuter)
{
nsTableOuterFrame* tableFrame = do_QueryFrame(mContent->GetPrimaryFrame());
if (!tableFrame)
return NS_OK;
nsIPresShell* presShell(mDoc->PresShell());
RefPtr<nsFrameSelection> tableSelection =
const_cast<nsFrameSelection*>(presShell->ConstFrameSelection());
bool doUnselectRow = (aTarget == nsISelectionPrivate::TABLESELECTION_ROW);
uint32_t count = doUnselectRow ? ColCount() : RowCount();
int32_t startRowIdx = doUnselectRow ? aIndex : 0;
int32_t endRowIdx = doUnselectRow ? aIndex : count - 1;
int32_t startColIdx = doUnselectRow ? 0 : aIndex;
int32_t endColIdx = doUnselectRow ? count - 1 : aIndex;
if (aIsOuter)
return tableSelection->RestrictCellsToSelection(mContent,
startRowIdx, startColIdx,
endRowIdx, endColIdx);
return tableSelection->RemoveCellsFromSelection(mContent,
startRowIdx, startColIdx,
endRowIdx, endColIdx);
}
void
HTMLTableAccessible::Description(nsString& aDescription)
{
// Helpful for debugging layout vs. data tables
aDescription.Truncate();
Accessible::Description(aDescription);
if (!aDescription.IsEmpty())
return;
// Use summary as description if it weren't used as a name.
// XXX: get rid code duplication with NameInternal().
Accessible* caption = Caption();
if (caption) {
nsIContent* captionContent = caption->GetContent();
if (captionContent) {
nsAutoString captionText;
nsTextEquivUtils::AppendTextEquivFromContent(this, captionContent,
&captionText);
if (!captionText.IsEmpty()) { // summary isn't used as a name.
mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::summary,
aDescription);
}
}
}
#ifdef SHOW_LAYOUT_HEURISTIC
if (aDescription.IsEmpty()) {
bool isProbablyForLayout = IsProbablyLayoutTable();
aDescription = mLayoutHeuristic;
}
printf("\nTABLE: %s\n", NS_ConvertUTF16toUTF8(mLayoutHeuristic).get());
#endif
}
bool
HTMLTableAccessible::HasDescendant(const nsAString& aTagName, bool aAllowEmpty)
{
nsCOMPtr<nsIHTMLCollection> elements =
mContent->AsElement()->GetElementsByTagName(aTagName);
Element* foundItem = elements->Item(0);
if (!foundItem)
return false;
if (aAllowEmpty)
return true;
// Make sure that the item we found has contents and either has multiple
// children or the found item is not a whitespace-only text node.
if (foundItem->GetChildCount() > 1)
return true; // Treat multiple child nodes as non-empty
nsIContent *innerItemContent = foundItem->GetFirstChild();
if (innerItemContent && !innerItemContent->TextIsOnlyWhitespace())
return true;
// If we found more than one node then return true not depending on
// aAllowEmpty flag.
// XXX it might be dummy but bug 501375 where we changed this addresses
// performance problems only. Note, currently 'aAllowEmpty' flag is used for
// caption element only. On another hand we create accessible object for
// the first entry of caption element (see
// HTMLTableAccessible::CacheChildren).
return !!elements->Item(1);
}
bool
HTMLTableAccessible::IsProbablyLayoutTable()
{
// Implement a heuristic to determine if table is most likely used for layout
// XXX do we want to look for rowspan or colspan, especialy that span all but a couple cells
// at the beginning or end of a row/col, and especially when they occur at the edge of a table?
// XXX expose this info via object attributes to AT-SPI
// XXX For now debugging descriptions are always on via SHOW_LAYOUT_HEURISTIC
// This will allow release trunk builds to be used by testers to refine the algorithm
// Change to |#define SHOW_LAYOUT_HEURISTIC DEBUG| before final release
#ifdef SHOW_LAYOUT_HEURISTIC
#define RETURN_LAYOUT_ANSWER(isLayout, heuristic) \
{ \
mLayoutHeuristic = isLayout ? \
NS_LITERAL_STRING("layout table: " heuristic) : \
NS_LITERAL_STRING("data table: " heuristic); \
return isLayout; \
}
#else
#define RETURN_LAYOUT_ANSWER(isLayout, heuristic) { return isLayout; }
#endif
DocAccessible* docAccessible = Document();
if (docAccessible) {
uint64_t docState = docAccessible->State();
if (docState & states::EDITABLE) { // Need to see all elements while document is being edited
RETURN_LAYOUT_ANSWER(false, "In editable document");
}
}
// Check to see if an ARIA role overrides the role from native markup,
// but for which we still expose table semantics (treegrid, for example).
if (Role() != roles::TABLE)
RETURN_LAYOUT_ANSWER(false, "Has role attribute");
if (mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::role)) {
// Role attribute is present, but overridden roles have already been dealt with.
// Only landmarks and other roles that don't override the role from native
// markup are left to deal with here.
RETURN_LAYOUT_ANSWER(false, "Has role attribute, weak role, and role is table");
}
NS_ASSERTION(mContent->IsHTMLElement(nsGkAtoms::table),
"table should not be built by CSS display:table style");
// Check if datatable attribute has "0" value.
if (mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::datatable,
NS_LITERAL_STRING("0"), eCaseMatters)) {
RETURN_LAYOUT_ANSWER(true, "Has datatable = 0 attribute, it's for layout");
}
// Check for legitimate data table attributes.
nsAutoString summary;
if (mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::summary, summary) &&
!summary.IsEmpty())
RETURN_LAYOUT_ANSWER(false, "Has summary -- legitimate table structures");
// Check for legitimate data table elements.
Accessible* caption = FirstChild();
if (caption && caption->Role() == roles::CAPTION && caption->HasChildren())
RETURN_LAYOUT_ANSWER(false, "Not empty caption -- legitimate table structures");
for (nsIContent* childElm = mContent->GetFirstChild(); childElm;
childElm = childElm->GetNextSibling()) {
if (!childElm->IsHTMLElement())
continue;
if (childElm->IsAnyOfHTMLElements(nsGkAtoms::col,
nsGkAtoms::colgroup,
nsGkAtoms::tfoot,
nsGkAtoms::thead)) {
RETURN_LAYOUT_ANSWER(false,
"Has col, colgroup, tfoot or thead -- legitimate table structures");
}
if (childElm->IsHTMLElement(nsGkAtoms::tbody)) {
for (nsIContent* rowElm = childElm->GetFirstChild(); rowElm;
rowElm = rowElm->GetNextSibling()) {
if (rowElm->IsHTMLElement(nsGkAtoms::tr)) {
for (nsIContent* cellElm = rowElm->GetFirstChild(); cellElm;
cellElm = cellElm->GetNextSibling()) {
if (cellElm->IsHTMLElement()) {
if (cellElm->NodeInfo()->Equals(nsGkAtoms::th)) {
RETURN_LAYOUT_ANSWER(false,
"Has th -- legitimate table structures");
}
if (cellElm->HasAttr(kNameSpaceID_None, nsGkAtoms::headers) ||
cellElm->HasAttr(kNameSpaceID_None, nsGkAtoms::scope) ||
cellElm->HasAttr(kNameSpaceID_None, nsGkAtoms::abbr)) {
RETURN_LAYOUT_ANSWER(false,
"Has headers, scope, or abbr attribute -- legitimate table structures");
}
Accessible* cell = mDoc->GetAccessible(cellElm);
if (cell && cell->ChildCount() == 1 &&
cell->FirstChild()->IsAbbreviation()) {
RETURN_LAYOUT_ANSWER(false,
"has abbr -- legitimate table structures");
}
}
}
}
}
}
}
if (HasDescendant(NS_LITERAL_STRING("table"))) {
RETURN_LAYOUT_ANSWER(true, "Has a nested table within it");
}
// If only 1 column or only 1 row, it's for layout
uint32_t colCount = ColCount();
if (colCount <=1) {
RETURN_LAYOUT_ANSWER(true, "Has only 1 column");
}
uint32_t rowCount = RowCount();
if (rowCount <=1) {
RETURN_LAYOUT_ANSWER(true, "Has only 1 row");
}
// Check for many columns
if (colCount >= 5) {
RETURN_LAYOUT_ANSWER(false, ">=5 columns");
}
// Now we know there are 2-4 columns and 2 or more rows
// Check to see if there are visible borders on the cells
// XXX currently, we just check the first cell -- do we really need to do more?
nsTableOuterFrame* tableFrame = do_QueryFrame(mContent->GetPrimaryFrame());
if (!tableFrame)
RETURN_LAYOUT_ANSWER(false, "table with no frame!");
nsIFrame* cellFrame = tableFrame->GetCellFrameAt(0, 0);
if (!cellFrame)
RETURN_LAYOUT_ANSWER(false, "table's first cell has no frame!");
nsMargin border;
cellFrame->GetBorder(border);
if (border.top && border.bottom && border.left && border.right) {
RETURN_LAYOUT_ANSWER(false, "Has nonzero border-width on table cell");
}
/**
* Rules for non-bordered tables with 2-4 columns and 2+ rows from here on forward
*/
// Check for styled background color across rows (alternating background
// color is a common feature for data tables).
uint32_t childCount = ChildCount();
nscolor rowColor = 0;
nscolor prevRowColor;
for (uint32_t childIdx = 0; childIdx < childCount; childIdx++) {
Accessible* child = GetChildAt(childIdx);
if (child->Role() == roles::ROW) {
prevRowColor = rowColor;
nsIFrame* rowFrame = child->GetFrame();
rowColor = rowFrame->StyleBackground()->mBackgroundColor;
if (childIdx > 0 && prevRowColor != rowColor)
RETURN_LAYOUT_ANSWER(false, "2 styles of row background color, non-bordered");
}
}
// Check for many rows
const uint32_t kMaxLayoutRows = 20;
if (rowCount > kMaxLayoutRows) { // A ton of rows, this is probably for data
RETURN_LAYOUT_ANSWER(false, ">= kMaxLayoutRows (20) and non-bordered");
}
// Check for very wide table.
nsIFrame* documentFrame = Document()->GetFrame();
nsSize documentSize = documentFrame->GetSize();
if (documentSize.width > 0) {
nsSize tableSize = GetFrame()->GetSize();
int32_t percentageOfDocWidth = (100 * tableSize.width) / documentSize.width;
if (percentageOfDocWidth > 95) {
// 3-4 columns, no borders, not a lot of rows, and 95% of the doc's width
// Probably for layout
RETURN_LAYOUT_ANSWER(true,
"<= 4 columns, table width is 95% of document width");
}
}
// Two column rules
if (rowCount * colCount <= 10) {
RETURN_LAYOUT_ANSWER(true, "2-4 columns, 10 cells or less, non-bordered");
}
if (HasDescendant(NS_LITERAL_STRING("embed")) ||
HasDescendant(NS_LITERAL_STRING("object")) ||
HasDescendant(NS_LITERAL_STRING("applet")) ||
HasDescendant(NS_LITERAL_STRING("iframe"))) {
RETURN_LAYOUT_ANSWER(true, "Has no borders, and has iframe, object, applet or iframe, typical of advertisements");
}
RETURN_LAYOUT_ANSWER(false, "no layout factor strong enough, so will guess data");
}
////////////////////////////////////////////////////////////////////////////////
// HTMLCaptionAccessible
////////////////////////////////////////////////////////////////////////////////
Relation
HTMLCaptionAccessible::RelationByType(RelationType aType)
{
Relation rel = HyperTextAccessible::RelationByType(aType);
if (aType == RelationType::LABEL_FOR)
rel.AppendTarget(Parent());
return rel;
}
role
HTMLCaptionAccessible::NativeRole()
{
return roles::CAPTION;
}
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