зеркало из https://github.com/mozilla/gecko-dev.git
464 строки
15 KiB
C++
464 строки
15 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsAccUtils.h"
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#include "LocalAccessible-inl.h"
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#include "AccAttributes.h"
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#include "ARIAMap.h"
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#include "nsAccessibilityService.h"
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#include "nsCoreUtils.h"
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#include "DocAccessible.h"
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#include "HyperTextAccessible.h"
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#include "nsIAccessibleTypes.h"
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#include "Role.h"
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#include "States.h"
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#include "TextLeafAccessible.h"
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#include "nsIDOMXULContainerElement.h"
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#include "nsISimpleEnumerator.h"
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#include "mozilla/a11y/PDocAccessibleChild.h"
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#include "mozilla/dom/Document.h"
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#include "mozilla/dom/Element.h"
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#include "nsAccessibilityService.h"
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using namespace mozilla;
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using namespace mozilla::a11y;
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void nsAccUtils::SetAccGroupAttrs(AccAttributes* aAttributes, int32_t aLevel,
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int32_t aSetSize, int32_t aPosInSet) {
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nsAutoString value;
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if (aLevel) {
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aAttributes->SetAttribute(nsGkAtoms::level, aLevel);
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}
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if (aSetSize && aPosInSet) {
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aAttributes->SetAttribute(nsGkAtoms::posinset, aPosInSet);
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aAttributes->SetAttribute(nsGkAtoms::setsize, aSetSize);
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}
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}
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int32_t nsAccUtils::GetDefaultLevel(const LocalAccessible* aAccessible) {
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roles::Role role = aAccessible->Role();
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if (role == roles::OUTLINEITEM) return 1;
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if (role == roles::ROW) {
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LocalAccessible* parent = aAccessible->LocalParent();
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// It is a row inside flatten treegrid. Group level is always 1 until it
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// is overriden by aria-level attribute.
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if (parent && parent->Role() == roles::TREE_TABLE) return 1;
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}
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return 0;
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}
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int32_t nsAccUtils::GetARIAOrDefaultLevel(const LocalAccessible* aAccessible) {
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int32_t level = 0;
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nsCoreUtils::GetUIntAttr(aAccessible->GetContent(), nsGkAtoms::aria_level,
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&level);
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if (level != 0) return level;
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return GetDefaultLevel(aAccessible);
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}
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int32_t nsAccUtils::GetLevelForXULContainerItem(nsIContent* aContent) {
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nsCOMPtr<nsIDOMXULContainerItemElement> item =
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aContent->AsElement()->AsXULContainerItem();
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if (!item) return 0;
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nsCOMPtr<dom::Element> containerElement;
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item->GetParentContainer(getter_AddRefs(containerElement));
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nsCOMPtr<nsIDOMXULContainerElement> container =
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containerElement ? containerElement->AsXULContainer() : nullptr;
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if (!container) return 0;
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// Get level of the item.
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int32_t level = -1;
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while (container) {
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level++;
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container->GetParentContainer(getter_AddRefs(containerElement));
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container = containerElement ? containerElement->AsXULContainer() : nullptr;
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}
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return level;
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}
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void nsAccUtils::SetLiveContainerAttributes(AccAttributes* aAttributes,
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nsIContent* aStartContent) {
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nsAutoString live, relevant, busy;
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dom::Document* doc = aStartContent->GetComposedDoc();
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if (!doc) {
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return;
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}
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dom::Element* topEl = doc->GetRootElement();
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nsIContent* ancestor = aStartContent;
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while (ancestor) {
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// container-relevant attribute
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if (relevant.IsEmpty() &&
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HasDefinedARIAToken(ancestor, nsGkAtoms::aria_relevant) &&
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ancestor->AsElement()->GetAttr(kNameSpaceID_None,
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nsGkAtoms::aria_relevant, relevant)) {
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aAttributes->SetAttribute(nsGkAtoms::containerRelevant, relevant);
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}
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// container-live, and container-live-role attributes
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if (live.IsEmpty()) {
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const nsRoleMapEntry* role = nullptr;
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if (ancestor->IsElement()) {
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role = aria::GetRoleMap(ancestor->AsElement());
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}
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if (HasDefinedARIAToken(ancestor, nsGkAtoms::aria_live)) {
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ancestor->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::aria_live,
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live);
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} else if (role) {
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GetLiveAttrValue(role->liveAttRule, live);
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} else if (nsStaticAtom* value = GetAccService()->MarkupAttribute(
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ancestor, nsGkAtoms::aria_live)) {
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value->ToString(live);
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}
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if (!live.IsEmpty()) {
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aAttributes->SetAttribute(nsGkAtoms::containerLive, live);
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if (role) {
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aAttributes->SetAttribute(nsGkAtoms::containerLiveRole,
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role->ARIARoleString());
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}
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}
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}
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// container-atomic attribute
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if (ancestor->IsElement() && ancestor->AsElement()->AttrValueIs(
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kNameSpaceID_None, nsGkAtoms::aria_atomic,
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nsGkAtoms::_true, eCaseMatters)) {
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aAttributes->SetAttribute(nsGkAtoms::containerAtomic, true);
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}
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// container-busy attribute
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if (busy.IsEmpty() && HasDefinedARIAToken(ancestor, nsGkAtoms::aria_busy) &&
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ancestor->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::aria_busy,
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busy)) {
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aAttributes->SetAttribute(nsGkAtoms::containerBusy, busy);
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}
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if (ancestor == topEl) {
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break;
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}
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ancestor = ancestor->GetParent();
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if (!ancestor) {
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ancestor = topEl; // Use <body>/<frameset>
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}
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}
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}
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bool nsAccUtils::HasDefinedARIAToken(nsIContent* aContent, nsAtom* aAtom) {
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NS_ASSERTION(aContent, "aContent is null in call to HasDefinedARIAToken!");
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if (!aContent->IsElement()) return false;
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dom::Element* element = aContent->AsElement();
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if (!element->HasAttr(kNameSpaceID_None, aAtom) ||
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element->AttrValueIs(kNameSpaceID_None, aAtom, nsGkAtoms::_empty,
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eCaseMatters) ||
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element->AttrValueIs(kNameSpaceID_None, aAtom, nsGkAtoms::_undefined,
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eCaseMatters)) {
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return false;
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}
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return true;
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}
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nsStaticAtom* nsAccUtils::GetARIAToken(dom::Element* aElement, nsAtom* aAttr) {
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if (!HasDefinedARIAToken(aElement, aAttr)) return nsGkAtoms::_empty;
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static dom::Element::AttrValuesArray tokens[] = {
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nsGkAtoms::_false, nsGkAtoms::_true, nsGkAtoms::mixed, nullptr};
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int32_t idx =
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aElement->FindAttrValueIn(kNameSpaceID_None, aAttr, tokens, eCaseMatters);
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if (idx >= 0) return tokens[idx];
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return nullptr;
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}
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nsStaticAtom* nsAccUtils::NormalizeARIAToken(dom::Element* aElement,
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nsAtom* aAttr) {
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if (!HasDefinedARIAToken(aElement, aAttr)) {
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return nsGkAtoms::_empty;
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}
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if (aAttr == nsGkAtoms::aria_current) {
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static dom::Element::AttrValuesArray tokens[] = {
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nsGkAtoms::page, nsGkAtoms::step, nsGkAtoms::location_,
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nsGkAtoms::date, nsGkAtoms::time, nsGkAtoms::_true,
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nullptr};
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int32_t idx = aElement->FindAttrValueIn(kNameSpaceID_None, aAttr, tokens,
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eCaseMatters);
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// If the token is present, return it, otherwise TRUE as per spec.
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return (idx >= 0) ? tokens[idx] : nsGkAtoms::_true;
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}
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return nullptr;
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}
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LocalAccessible* nsAccUtils::GetSelectableContainer(
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LocalAccessible* aAccessible, uint64_t aState) {
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if (!aAccessible) return nullptr;
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if (!(aState & states::SELECTABLE)) return nullptr;
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LocalAccessible* parent = aAccessible;
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while ((parent = parent->LocalParent()) && !parent->IsSelect()) {
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if (parent->Role() == roles::PANE) return nullptr;
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}
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return parent;
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}
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bool nsAccUtils::IsDOMAttrTrue(const LocalAccessible* aAccessible,
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nsAtom* aAttr) {
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dom::Element* el = aAccessible->Elm();
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return el && el->AttrValueIs(kNameSpaceID_None, aAttr, nsGkAtoms::_true,
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eCaseMatters);
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}
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LocalAccessible* nsAccUtils::TableFor(LocalAccessible* aRow) {
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if (aRow) {
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LocalAccessible* table = aRow->LocalParent();
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if (table) {
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roles::Role tableRole = table->Role();
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const nsRoleMapEntry* roleMapEntry = table->ARIARoleMap();
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if (tableRole == roles::GROUPING || // if there's a rowgroup.
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(table->IsGenericHyperText() && !roleMapEntry &&
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!table->IsTable())) { // or there is a wrapping text container
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table = table->LocalParent();
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if (table) tableRole = table->Role();
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}
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return (tableRole == roles::TABLE || tableRole == roles::TREE_TABLE ||
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tableRole == roles::MATHML_TABLE)
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? table
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: nullptr;
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}
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}
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return nullptr;
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}
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HyperTextAccessible* nsAccUtils::GetTextContainer(nsINode* aNode) {
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// Get text accessible containing the result node.
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DocAccessible* doc = GetAccService()->GetDocAccessible(aNode->OwnerDoc());
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LocalAccessible* accessible =
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doc ? doc->GetAccessibleOrContainer(aNode) : nullptr;
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if (!accessible) return nullptr;
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do {
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HyperTextAccessible* textAcc = accessible->AsHyperText();
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if (textAcc) return textAcc;
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accessible = accessible->LocalParent();
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} while (accessible);
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return nullptr;
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}
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nsIntPoint nsAccUtils::ConvertToScreenCoords(int32_t aX, int32_t aY,
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uint32_t aCoordinateType,
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LocalAccessible* aAccessible) {
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nsIntPoint coords(aX, aY);
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switch (aCoordinateType) {
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case nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE:
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break;
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case nsIAccessibleCoordinateType::COORDTYPE_WINDOW_RELATIVE: {
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coords += nsCoreUtils::GetScreenCoordsForWindow(aAccessible->GetNode());
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break;
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}
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case nsIAccessibleCoordinateType::COORDTYPE_PARENT_RELATIVE: {
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coords += GetScreenCoordsForParent(aAccessible);
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break;
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}
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default:
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MOZ_ASSERT_UNREACHABLE("invalid coord type!");
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}
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return coords;
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}
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void nsAccUtils::ConvertScreenCoordsTo(int32_t* aX, int32_t* aY,
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uint32_t aCoordinateType,
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LocalAccessible* aAccessible) {
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switch (aCoordinateType) {
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case nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE:
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break;
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case nsIAccessibleCoordinateType::COORDTYPE_WINDOW_RELATIVE: {
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nsIntPoint coords =
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nsCoreUtils::GetScreenCoordsForWindow(aAccessible->GetNode());
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*aX -= coords.x;
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*aY -= coords.y;
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break;
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}
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case nsIAccessibleCoordinateType::COORDTYPE_PARENT_RELATIVE: {
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nsIntPoint coords = GetScreenCoordsForParent(aAccessible);
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*aX -= coords.x;
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*aY -= coords.y;
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break;
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}
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default:
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MOZ_ASSERT_UNREACHABLE("invalid coord type!");
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}
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}
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nsIntPoint nsAccUtils::GetScreenCoordsForParent(LocalAccessible* aAccessible) {
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LocalAccessible* parent = aAccessible->LocalParent();
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if (!parent) return nsIntPoint(0, 0);
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nsIFrame* parentFrame = parent->GetFrame();
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if (!parentFrame) return nsIntPoint(0, 0);
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nsRect rect = parentFrame->GetScreenRectInAppUnits();
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return nsPoint(rect.X(), rect.Y())
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.ToNearestPixels(parentFrame->PresContext()->AppUnitsPerDevPixel());
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}
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bool nsAccUtils::GetLiveAttrValue(uint32_t aRule, nsAString& aValue) {
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switch (aRule) {
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case eOffLiveAttr:
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aValue = u"off"_ns;
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return true;
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case ePoliteLiveAttr:
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aValue = u"polite"_ns;
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return true;
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case eAssertiveLiveAttr:
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aValue = u"assertive"_ns;
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return true;
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}
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return false;
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}
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#ifdef DEBUG
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bool nsAccUtils::IsTextInterfaceSupportCorrect(LocalAccessible* aAccessible) {
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// Don't test for accessible docs, it makes us create accessibles too
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// early and fire mutation events before we need to
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if (aAccessible->IsDoc()) return true;
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bool foundText = false;
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uint32_t childCount = aAccessible->ChildCount();
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for (uint32_t childIdx = 0; childIdx < childCount; childIdx++) {
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LocalAccessible* child = aAccessible->LocalChildAt(childIdx);
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if (child && child->IsText()) {
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foundText = true;
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break;
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}
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}
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return !foundText || aAccessible->IsHyperText();
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}
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#endif
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uint32_t nsAccUtils::TextLength(LocalAccessible* aAccessible) {
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if (!aAccessible->IsText()) {
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return 1;
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}
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TextLeafAccessible* textLeaf = aAccessible->AsTextLeaf();
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if (textLeaf) return textLeaf->Text().Length();
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// For list bullets (or anything other accessible which would compute its own
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// text. They don't have their own frame.
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// XXX In the future, list bullets may have frame and anon content, so
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// we should be able to remove this at that point
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nsAutoString text;
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aAccessible->AppendTextTo(text); // Get all the text
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return text.Length();
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}
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bool nsAccUtils::MustPrune(Accessible* aAccessible) {
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MOZ_ASSERT(aAccessible);
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roles::Role role = aAccessible->Role();
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if (role == roles::SLIDER) {
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// Always prune the tree for sliders, as it doesn't make sense for a
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// slider to have descendants and this confuses NVDA.
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return true;
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}
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if (role != roles::MENUITEM && role != roles::COMBOBOX_OPTION &&
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role != roles::OPTION && role != roles::ENTRY &&
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role != roles::FLAT_EQUATION && role != roles::PASSWORD_TEXT &&
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role != roles::PUSHBUTTON && role != roles::TOGGLE_BUTTON &&
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role != roles::GRAPHIC && role != roles::PROGRESSBAR &&
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role != roles::SEPARATOR) {
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// If it doesn't match any of these roles, don't prune its children.
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return false;
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}
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if (aAccessible->ChildCount() != 1) {
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// If the accessible has more than one child, don't prune it.
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return false;
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}
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roles::Role childRole = aAccessible->FirstChild()->Role();
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// If the accessible's child is a text leaf, prune the accessible.
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return childRole == roles::TEXT_LEAF || childRole == roles::STATICTEXT;
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}
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bool nsAccUtils::IsARIALive(const LocalAccessible* aAccessible) {
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// Get computed aria-live property based on the closest container with the
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// attribute. Inner nodes override outer nodes within the same
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// document.
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// This should be the same as the container-live attribute, but we don't need
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// the other container-* attributes, so we can't use the same function.
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nsIContent* ancestor = aAccessible->GetContent();
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if (!ancestor) {
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return false;
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}
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dom::Document* doc = ancestor->GetComposedDoc();
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if (!doc) {
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return false;
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}
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dom::Element* topEl = doc->GetRootElement();
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while (ancestor) {
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const nsRoleMapEntry* role = nullptr;
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if (ancestor->IsElement()) {
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role = aria::GetRoleMap(ancestor->AsElement());
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}
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nsAutoString live;
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if (HasDefinedARIAToken(ancestor, nsGkAtoms::aria_live)) {
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ancestor->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::aria_live,
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live);
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} else if (role) {
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GetLiveAttrValue(role->liveAttRule, live);
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} else if (nsStaticAtom* value = GetAccService()->MarkupAttribute(
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ancestor, nsGkAtoms::aria_live)) {
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value->ToString(live);
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}
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if (!live.IsEmpty() && !live.EqualsLiteral("off")) {
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return true;
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}
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if (ancestor == topEl) {
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break;
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}
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ancestor = ancestor->GetParent();
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if (!ancestor) {
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ancestor = topEl; // Use <body>/<frameset>
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}
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}
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return false;
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}
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