gecko-dev/accessible/base/AccIterator.cpp

371 строка
12 KiB
C++

/* 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 "AccIterator.h"
#include "AccGroupInfo.h"
#ifdef MOZ_XUL
# include "XULTreeAccessible.h"
#endif
#include "mozilla/dom/HTMLLabelElement.h"
using namespace mozilla;
using namespace mozilla::a11y;
////////////////////////////////////////////////////////////////////////////////
// AccIterator
////////////////////////////////////////////////////////////////////////////////
AccIterator::AccIterator(const Accessible* aAccessible,
filters::FilterFuncPtr aFilterFunc)
: mFilterFunc(aFilterFunc) {
mState = new IteratorState(aAccessible);
}
AccIterator::~AccIterator() {
while (mState) {
IteratorState* tmp = mState;
mState = tmp->mParentState;
delete tmp;
}
}
Accessible* AccIterator::Next() {
while (mState) {
Accessible* child = mState->mParent->GetChildAt(mState->mIndex++);
if (!child) {
IteratorState* tmp = mState;
mState = mState->mParentState;
delete tmp;
continue;
}
uint32_t result = mFilterFunc(child);
if (result & filters::eMatch) return child;
if (!(result & filters::eSkipSubtree)) {
IteratorState* childState = new IteratorState(child, mState);
mState = childState;
}
}
return nullptr;
}
////////////////////////////////////////////////////////////////////////////////
// nsAccIterator::IteratorState
AccIterator::IteratorState::IteratorState(const Accessible* aParent,
IteratorState* mParentState)
: mParent(aParent), mIndex(0), mParentState(mParentState) {}
////////////////////////////////////////////////////////////////////////////////
// RelatedAccIterator
////////////////////////////////////////////////////////////////////////////////
RelatedAccIterator::RelatedAccIterator(DocAccessible* aDocument,
nsIContent* aDependentContent,
nsAtom* aRelAttr)
: mDocument(aDocument),
mRelAttr(aRelAttr),
mProviders(nullptr),
mBindingParent(nullptr),
mIndex(0) {
mBindingParent = aDependentContent->IsInAnonymousSubtree()
? aDependentContent->GetBindingParent()
: nullptr;
nsAtom* IDAttr = mBindingParent ? nsGkAtoms::anonid : nsGkAtoms::id;
nsAutoString id;
if (aDependentContent->IsElement() &&
aDependentContent->AsElement()->GetAttr(kNameSpaceID_None, IDAttr, id)) {
mProviders = mDocument->GetRelProviders(aDependentContent->AsElement(), id);
}
}
Accessible* RelatedAccIterator::Next() {
if (!mProviders) return nullptr;
while (mIndex < mProviders->Length()) {
DocAccessible::AttrRelProvider* provider = (*mProviders)[mIndex++];
// Return related accessible for the given attribute and if the provider
// content is in the same binding in the case of XBL usage.
if (provider->mRelAttr == mRelAttr) {
nsIContent* bindingParent = provider->mContent->IsInAnonymousSubtree()
? provider->mContent->GetBindingParent()
: nullptr;
bool inScope = mBindingParent == bindingParent ||
mBindingParent == provider->mContent;
if (inScope) {
Accessible* related = mDocument->GetAccessible(provider->mContent);
if (related) return related;
// If the document content is pointed by relation then return the
// document itself.
if (provider->mContent == mDocument->GetContent()) return mDocument;
}
}
}
return nullptr;
}
////////////////////////////////////////////////////////////////////////////////
// HTMLLabelIterator
////////////////////////////////////////////////////////////////////////////////
HTMLLabelIterator::HTMLLabelIterator(DocAccessible* aDocument,
const Accessible* aAccessible,
LabelFilter aFilter)
: mRelIter(aDocument, aAccessible->GetContent(), nsGkAtoms::_for),
mAcc(aAccessible),
mLabelFilter(aFilter) {}
bool HTMLLabelIterator::IsLabel(Accessible* aLabel) {
dom::HTMLLabelElement* labelEl =
dom::HTMLLabelElement::FromNode(aLabel->GetContent());
return labelEl && labelEl->GetControl() == mAcc->GetContent();
}
Accessible* HTMLLabelIterator::Next() {
// Get either <label for="[id]"> element which explicitly points to given
// element, or <label> ancestor which implicitly point to it.
Accessible* label = nullptr;
while ((label = mRelIter.Next())) {
if (IsLabel(label)) {
return label;
}
}
// Ignore ancestor label on not widget accessible.
if (mLabelFilter == eSkipAncestorLabel || !mAcc->IsWidget()) return nullptr;
// Go up tree to get a name of ancestor label if there is one (an ancestor
// <label> implicitly points to us). Don't go up farther than form or
// document.
Accessible* walkUp = mAcc->Parent();
while (walkUp && !walkUp->IsDoc()) {
nsIContent* walkUpEl = walkUp->GetContent();
if (IsLabel(walkUp) &&
!walkUpEl->AsElement()->HasAttr(kNameSpaceID_None, nsGkAtoms::_for)) {
mLabelFilter = eSkipAncestorLabel; // prevent infinite loop
return walkUp;
}
if (walkUpEl->IsHTMLElement(nsGkAtoms::form)) break;
walkUp = walkUp->Parent();
}
return nullptr;
}
////////////////////////////////////////////////////////////////////////////////
// HTMLOutputIterator
////////////////////////////////////////////////////////////////////////////////
HTMLOutputIterator::HTMLOutputIterator(DocAccessible* aDocument,
nsIContent* aElement)
: mRelIter(aDocument, aElement, nsGkAtoms::_for) {}
Accessible* HTMLOutputIterator::Next() {
Accessible* output = nullptr;
while ((output = mRelIter.Next())) {
if (output->GetContent()->IsHTMLElement(nsGkAtoms::output)) return output;
}
return nullptr;
}
////////////////////////////////////////////////////////////////////////////////
// XULLabelIterator
////////////////////////////////////////////////////////////////////////////////
XULLabelIterator::XULLabelIterator(DocAccessible* aDocument,
nsIContent* aElement)
: mRelIter(aDocument, aElement, nsGkAtoms::control) {}
Accessible* XULLabelIterator::Next() {
Accessible* label = nullptr;
while ((label = mRelIter.Next())) {
if (label->GetContent()->IsXULElement(nsGkAtoms::label)) return label;
}
return nullptr;
}
////////////////////////////////////////////////////////////////////////////////
// XULDescriptionIterator
////////////////////////////////////////////////////////////////////////////////
XULDescriptionIterator::XULDescriptionIterator(DocAccessible* aDocument,
nsIContent* aElement)
: mRelIter(aDocument, aElement, nsGkAtoms::control) {}
Accessible* XULDescriptionIterator::Next() {
Accessible* descr = nullptr;
while ((descr = mRelIter.Next())) {
if (descr->GetContent()->IsXULElement(nsGkAtoms::description)) return descr;
}
return nullptr;
}
////////////////////////////////////////////////////////////////////////////////
// IDRefsIterator
////////////////////////////////////////////////////////////////////////////////
IDRefsIterator::IDRefsIterator(DocAccessible* aDoc, nsIContent* aContent,
nsAtom* aIDRefsAttr)
: mContent(aContent), mDoc(aDoc), mCurrIdx(0) {
if (mContent->IsElement()) {
mContent->AsElement()->GetAttr(kNameSpaceID_None, aIDRefsAttr, mIDs);
}
}
const nsDependentSubstring IDRefsIterator::NextID() {
for (; mCurrIdx < mIDs.Length(); mCurrIdx++) {
if (!NS_IsAsciiWhitespace(mIDs[mCurrIdx])) break;
}
if (mCurrIdx >= mIDs.Length()) return nsDependentSubstring();
nsAString::index_type idStartIdx = mCurrIdx;
while (++mCurrIdx < mIDs.Length()) {
if (NS_IsAsciiWhitespace(mIDs[mCurrIdx])) break;
}
return Substring(mIDs, idStartIdx, mCurrIdx++ - idStartIdx);
}
nsIContent* IDRefsIterator::NextElem() {
while (true) {
const nsDependentSubstring id = NextID();
if (id.IsEmpty()) break;
nsIContent* refContent = GetElem(id);
if (refContent) return refContent;
}
return nullptr;
}
dom::Element* IDRefsIterator::GetElem(nsIContent* aContent,
const nsAString& aID) {
// Get elements in DOM tree by ID attribute if this is an explicit content.
// In case of bound element check its anonymous subtree.
if (!aContent->IsInAnonymousSubtree()) {
dom::DocumentOrShadowRoot* docOrShadowRoot =
aContent->GetUncomposedDocOrConnectedShadowRoot();
if (docOrShadowRoot) {
dom::Element* refElm = docOrShadowRoot->GetElementById(aID);
if (refElm || !aContent->GetXBLBinding()) {
return refElm;
}
}
}
// If content is in anonymous subtree or an element having anonymous subtree
// then use "anonid" attribute to get elements in anonymous subtree.
// Check inside the binding the element is contained in.
nsIContent* bindingParent = aContent->GetBindingParent();
if (bindingParent) {
dom::Element* refElm =
bindingParent->OwnerDoc()->GetAnonymousElementByAttribute(
bindingParent, nsGkAtoms::anonid, aID);
if (refElm) return refElm;
}
// Check inside the binding of the element.
if (aContent->GetXBLBinding()) {
return aContent->OwnerDoc()->GetAnonymousElementByAttribute(
aContent, nsGkAtoms::anonid, aID);
}
return nullptr;
}
dom::Element* IDRefsIterator::GetElem(const nsDependentSubstring& aID) {
return GetElem(mContent, aID);
}
Accessible* IDRefsIterator::Next() {
nsIContent* nextEl = nullptr;
while ((nextEl = NextElem())) {
Accessible* acc = mDoc->GetAccessible(nextEl);
if (acc) {
return acc;
}
}
return nullptr;
}
////////////////////////////////////////////////////////////////////////////////
// SingleAccIterator
////////////////////////////////////////////////////////////////////////////////
Accessible* SingleAccIterator::Next() {
RefPtr<Accessible> nextAcc;
mAcc.swap(nextAcc);
if (!nextAcc || nextAcc->IsDefunct()) {
return nullptr;
}
return nextAcc;
}
////////////////////////////////////////////////////////////////////////////////
// ItemIterator
////////////////////////////////////////////////////////////////////////////////
Accessible* ItemIterator::Next() {
if (mContainer) {
mAnchor = AccGroupInfo::FirstItemOf(mContainer);
mContainer = nullptr;
return mAnchor;
}
return mAnchor ? (mAnchor = AccGroupInfo::NextItemTo(mAnchor)) : nullptr;
}
////////////////////////////////////////////////////////////////////////////////
// XULTreeItemIterator
////////////////////////////////////////////////////////////////////////////////
XULTreeItemIterator::XULTreeItemIterator(const XULTreeAccessible* aXULTree,
nsITreeView* aTreeView,
int32_t aRowIdx)
: mXULTree(aXULTree),
mTreeView(aTreeView),
mRowCount(-1),
mContainerLevel(-1),
mCurrRowIdx(aRowIdx + 1) {
mTreeView->GetRowCount(&mRowCount);
if (aRowIdx != -1) mTreeView->GetLevel(aRowIdx, &mContainerLevel);
}
Accessible* XULTreeItemIterator::Next() {
while (mCurrRowIdx < mRowCount) {
int32_t level = 0;
mTreeView->GetLevel(mCurrRowIdx, &level);
if (level == mContainerLevel + 1)
return mXULTree->GetTreeItemAccessible(mCurrRowIdx++);
if (level <= mContainerLevel) { // got level up
mCurrRowIdx = mRowCount;
break;
}
mCurrRowIdx++;
}
return nullptr;
}