third_party/WebKit/Source/modules/accessibility/AXARIAGridRow.cpp

/*
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 *     from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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#include "modules/accessibility/AXARIAGridRow.h"

#include "modules/accessibility/AXObjectCacheImpl.h"
#include "modules/accessibility/AXTable.h"

namespace blink {

AXARIAGridRow::AXARIAGridRow(LayoutObject* layout_object,
                             AXObjectCacheImpl& ax_object_cache)
    : AXTableRow(layout_object, ax_object_cache) {}

AXARIAGridRow::~AXARIAGridRow() {}

AXARIAGridRow* AXARIAGridRow::Create(LayoutObject* layout_object,
                                     AXObjectCacheImpl& ax_object_cache) {
  return new AXARIAGridRow(layout_object, ax_object_cache);
}

bool AXARIAGridRow::IsARIARow() const {
  AXObject* parent = ParentTable();
  if (!parent)
    return false;

  AccessibilityRole parent_role = parent->AriaRoleAttribute();
  return parent_role == kTreeGridRole || parent_role == kGridRole;
}

void AXARIAGridRow::HeaderObjectsForRow(AXObjectVector& headers) {
  for (const auto& cell : Children()) {
    if (cell->RoleValue() == kRowHeaderRole)
      headers.push_back(cell);
  }
}

bool AXARIAGridRow::AddCell(AXObject* possible_cell) {
  if (!possible_cell)
    return false;

  AccessibilityRole role = possible_cell->RoleValue();
  if (role != kCellRole && role != kRowHeaderRole && role != kColumnHeaderRole)
    return false;

  cells_.push_back(possible_cell);
  return true;
}

void AXARIAGridRow::ComputeCells(AXObjectVector possible_cells) {
  // Only add children that are actually rows.
  for (const auto& possible_cell : possible_cells) {
    if (!AddCell(possible_cell)) {
      // Normally with good authoring practices, the cells should be children of
      // the row. However, if this is not the case, recursively look for cells
      // in the descendants of the non-row child.
      if (!possible_cell->HasChildren())
        possible_cell->AddChildren();

      ComputeCells(possible_cell->Children());
    }
  }
}

void AXARIAGridRow::AddChildren() {
  DCHECK(!IsDetached());
  DCHECK(!have_children_);

  AXTableRow::AddChildren();

  if (IsTableRow() && layout_object_) {
    ComputeCells(children_);
  }
}

AXObject* AXARIAGridRow::ParentTable() const {
  // A poorly-authored ARIA grid row could be nested within wrapper elements.
  AXObject* ancestor = static_cast<AXObject*>(const_cast<AXARIAGridRow*>(this));
  do {
    ancestor = ancestor->ParentObjectUnignored();
  } while (ancestor && !ancestor->IsAXTable());

  return ancestor;
}

void AXARIAGridRow::Trace(blink::Visitor* visitor) {
  visitor->Trace(cells_);
  AXTableRow::Trace(visitor);
}

}  // namespace blink