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Diffstat (limited to 'accessible/ipc/RemoteAccessibleBase.cpp')
| -rw-r--r-- | accessible/ipc/RemoteAccessibleBase.cpp | 2121 |
1 files changed, 2121 insertions, 0 deletions
diff --git a/accessible/ipc/RemoteAccessibleBase.cpp b/accessible/ipc/RemoteAccessibleBase.cpp new file mode 100644 index 0000000000..89c887fa4a --- /dev/null +++ b/accessible/ipc/RemoteAccessibleBase.cpp @@ -0,0 +1,2121 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=2 et sw=2 tw=80: */ +/* 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 "ARIAMap.h" +#include "CachedTableAccessible.h" +#include "DocAccessible.h" +#include "RemoteAccessibleBase.h" +#include "mozilla/a11y/DocAccessibleParent.h" +#include "mozilla/a11y/DocManager.h" +#include "mozilla/a11y/Platform.h" +#include "mozilla/a11y/RemoteAccessibleBase.h" +#include "mozilla/a11y/RemoteAccessible.h" +#include "mozilla/a11y/Role.h" +#include "mozilla/a11y/TableAccessible.h" +#include "mozilla/a11y/TableCellAccessible.h" +#include "mozilla/BinarySearch.h" +#include "mozilla/dom/Element.h" +#include "mozilla/dom/BrowserParent.h" +#include "mozilla/dom/CanonicalBrowsingContext.h" +#include "mozilla/dom/DocumentInlines.h" +#include "mozilla/gfx/Matrix.h" +#include "nsAccessibilityService.h" +#include "mozilla/Unused.h" +#include "nsAccUtils.h" +#include "nsTextEquivUtils.h" +#include "Pivot.h" +#include "Relation.h" +#include "RelationType.h" +#include "TextLeafRange.h" +#include "xpcAccessibleDocument.h" + +#ifdef A11Y_LOG +# include "Logging.h" +# define VERIFY_CACHE(domain) \ + if (logging::IsEnabled(logging::eCache)) { \ + Unused << mDoc->SendVerifyCache(mID, domain, mCachedFields); \ + } +#else +# define VERIFY_CACHE(domain) \ + do { \ + } while (0) + +#endif + +namespace mozilla { +namespace a11y { + +template <class Derived> +void RemoteAccessibleBase<Derived>::Shutdown() { + MOZ_DIAGNOSTIC_ASSERT(!IsDoc()); + xpcAccessibleDocument* xpcDoc = + GetAccService()->GetCachedXPCDocument(Document()); + if (xpcDoc) { + xpcDoc->NotifyOfShutdown(static_cast<Derived*>(this)); + } + + if (IsTable() || IsTableCell()) { + CachedTableAccessible::Invalidate(this); + } + + // Remove this acc's relation map from the doc's map of + // reverse relations. Prune forward relations associated with this + // acc's reverse relations. This also removes the acc's map of reverse + // rels from the mDoc's mReverseRelations. + PruneRelationsOnShutdown(); + + // XXX Ideally this wouldn't be necessary, but it seems OuterDoc + // accessibles can be destroyed before the doc they own. + uint32_t childCount = mChildren.Length(); + if (!IsOuterDoc()) { + for (uint32_t idx = 0; idx < childCount; idx++) mChildren[idx]->Shutdown(); + } else { + if (childCount > 1) { + MOZ_CRASH("outer doc has too many documents!"); + } else if (childCount == 1) { + mChildren[0]->AsDoc()->Unbind(); + } + } + + mChildren.Clear(); + ProxyDestroyed(static_cast<Derived*>(this)); + mDoc->RemoveAccessible(static_cast<Derived*>(this)); +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::SetChildDoc( + DocAccessibleParent* aChildDoc) { + MOZ_ASSERT(aChildDoc); + MOZ_ASSERT(mChildren.Length() == 0); + mChildren.AppendElement(aChildDoc); +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::ClearChildDoc( + DocAccessibleParent* aChildDoc) { + MOZ_ASSERT(aChildDoc); + // This is possible if we're replacing one document with another: Doc 1 + // has not had a chance to remove itself, but was already replaced by Doc 2 + // in SetChildDoc(). This could result in two subsequent calls to + // ClearChildDoc() even though mChildren.Length() == 1. + MOZ_ASSERT(mChildren.Length() <= 1); + mChildren.RemoveElement(aChildDoc); +} + +template <class Derived> +uint32_t RemoteAccessibleBase<Derived>::EmbeddedChildCount() { + size_t count = 0, kids = mChildren.Length(); + for (size_t i = 0; i < kids; i++) { + if (mChildren[i]->IsEmbeddedObject()) { + count++; + } + } + + return count; +} + +template <class Derived> +int32_t RemoteAccessibleBase<Derived>::IndexOfEmbeddedChild( + Accessible* aChild) { + size_t index = 0, kids = mChildren.Length(); + for (size_t i = 0; i < kids; i++) { + if (mChildren[i]->IsEmbeddedObject()) { + if (mChildren[i] == aChild) { + return index; + } + + index++; + } + } + + return -1; +} + +template <class Derived> +Accessible* RemoteAccessibleBase<Derived>::EmbeddedChildAt(uint32_t aChildIdx) { + size_t index = 0, kids = mChildren.Length(); + for (size_t i = 0; i < kids; i++) { + if (!mChildren[i]->IsEmbeddedObject()) { + continue; + } + + if (index == aChildIdx) { + return mChildren[i]; + } + + index++; + } + + return nullptr; +} + +template <class Derived> +LocalAccessible* RemoteAccessibleBase<Derived>::OuterDocOfRemoteBrowser() + const { + auto tab = static_cast<dom::BrowserParent*>(mDoc->Manager()); + dom::Element* frame = tab->GetOwnerElement(); + NS_ASSERTION(frame, "why isn't the tab in a frame!"); + if (!frame) return nullptr; + + DocAccessible* chromeDoc = GetExistingDocAccessible(frame->OwnerDoc()); + + return chromeDoc ? chromeDoc->GetAccessible(frame) : nullptr; +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::SetParent(Derived* aParent) { + if (!aParent) { + mParent = kNoParent; + } else { + MOZ_ASSERT(!IsDoc() || !aParent->IsDoc()); + mParent = aParent->ID(); + } +} + +template <class Derived> +Derived* RemoteAccessibleBase<Derived>::RemoteParent() const { + if (mParent == kNoParent) { + return nullptr; + } + + // if we are not a document then are parent is another proxy in the same + // document. That means we can just ask our document for the proxy with our + // parent id. + if (!IsDoc()) { + return Document()->GetAccessible(mParent); + } + + // If we are a top level document then our parent is not a proxy. + if (AsDoc()->IsTopLevel()) { + return nullptr; + } + + // Finally if we are a non top level document then our parent id is for a + // proxy in our parent document so get the proxy from there. + DocAccessibleParent* parentDoc = AsDoc()->ParentDoc(); + MOZ_ASSERT(parentDoc); + MOZ_ASSERT(mParent); + return parentDoc->GetAccessible(mParent); +} + +template <class Derived> +ENameValueFlag RemoteAccessibleBase<Derived>::Name(nsString& aName) const { + ENameValueFlag nameFlag = eNameOK; + if (mCachedFields) { + if (IsText()) { + mCachedFields->GetAttribute(nsGkAtoms::text, aName); + return eNameOK; + } + auto cachedNameFlag = + mCachedFields->GetAttribute<int32_t>(nsGkAtoms::explicit_name); + if (cachedNameFlag) { + nameFlag = static_cast<ENameValueFlag>(*cachedNameFlag); + } + if (mCachedFields->GetAttribute(nsGkAtoms::name, aName)) { + VERIFY_CACHE(CacheDomain::NameAndDescription); + return nameFlag; + } + } + + MOZ_ASSERT(aName.IsEmpty()); + aName.SetIsVoid(true); + return nameFlag; +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::Description(nsString& aDescription) const { + if (mCachedFields) { + mCachedFields->GetAttribute(nsGkAtoms::description, aDescription); + VERIFY_CACHE(CacheDomain::NameAndDescription); + } +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::Value(nsString& aValue) const { + if (mCachedFields) { + if (mCachedFields->HasAttribute(nsGkAtoms::aria_valuetext)) { + mCachedFields->GetAttribute(nsGkAtoms::aria_valuetext, aValue); + VERIFY_CACHE(CacheDomain::Value); + return; + } + + if (HasNumericValue()) { + double checkValue = CurValue(); + if (!std::isnan(checkValue)) { + aValue.AppendFloat(checkValue); + } + return; + } + + const nsRoleMapEntry* roleMapEntry = ARIARoleMap(); + // Value of textbox is a textified subtree. + if (roleMapEntry && roleMapEntry->Is(nsGkAtoms::textbox)) { + nsTextEquivUtils::GetTextEquivFromSubtree(this, aValue); + return; + } + + if (IsCombobox()) { + // For combo boxes, rely on selection state to determine the value. + const Accessible* option = + const_cast<RemoteAccessibleBase<Derived>*>(this)->GetSelectedItem(0); + if (option) { + option->Name(aValue); + } else { + // If no selected item, determine the value from descendant elements. + nsTextEquivUtils::GetTextEquivFromSubtree(this, aValue); + } + return; + } + + if (IsTextLeaf() || IsImage()) { + if (const Accessible* actionAcc = ActionAncestor()) { + if (const_cast<Accessible*>(actionAcc)->State() & states::LINKED) { + // Text and image descendants of links expose the link URL as the + // value. + return actionAcc->Value(aValue); + } + } + } + } +} + +template <class Derived> +double RemoteAccessibleBase<Derived>::CurValue() const { + if (mCachedFields) { + if (auto value = mCachedFields->GetAttribute<double>(nsGkAtoms::value)) { + VERIFY_CACHE(CacheDomain::Value); + return *value; + } + } + + return UnspecifiedNaN<double>(); +} + +template <class Derived> +double RemoteAccessibleBase<Derived>::MinValue() const { + if (mCachedFields) { + if (auto min = mCachedFields->GetAttribute<double>(nsGkAtoms::min)) { + VERIFY_CACHE(CacheDomain::Value); + return *min; + } + } + + return UnspecifiedNaN<double>(); +} + +template <class Derived> +double RemoteAccessibleBase<Derived>::MaxValue() const { + if (mCachedFields) { + if (auto max = mCachedFields->GetAttribute<double>(nsGkAtoms::max)) { + VERIFY_CACHE(CacheDomain::Value); + return *max; + } + } + + return UnspecifiedNaN<double>(); +} + +template <class Derived> +double RemoteAccessibleBase<Derived>::Step() const { + if (mCachedFields) { + if (auto step = mCachedFields->GetAttribute<double>(nsGkAtoms::step)) { + VERIFY_CACHE(CacheDomain::Value); + return *step; + } + } + + return UnspecifiedNaN<double>(); +} + +template <class Derived> +bool RemoteAccessibleBase<Derived>::SetCurValue(double aValue) { + if (!HasNumericValue() || IsProgress()) { + return false; + } + + const uint32_t kValueCannotChange = states::READONLY | states::UNAVAILABLE; + if (State() & kValueCannotChange) { + return false; + } + + double checkValue = MinValue(); + if (!std::isnan(checkValue) && aValue < checkValue) { + return false; + } + + checkValue = MaxValue(); + if (!std::isnan(checkValue) && aValue > checkValue) { + return false; + } + + Unused << mDoc->SendSetCurValue(mID, aValue); + return true; +} + +template <class Derived> +bool RemoteAccessibleBase<Derived>::ContainsPoint(int32_t aX, int32_t aY) { + if (!BoundsWithOffset(Nothing(), true).Contains(aX, aY)) { + return false; + } + if (!IsTextLeaf()) { + return true; + } + // This is a text leaf. The text might wrap across lines, which means our + // rect might cover a wider area than the actual text. For example, if the + // text begins in the middle of the first line and wraps on to the second, + // the rect will cover the start of the first line and the end of the second. + auto lines = GetCachedTextLines(); + if (!lines) { + // This means the text is empty or occupies a single line (but does not + // begin the line). In that case, the Bounds check above is sufficient, + // since there's only one rect. + return true; + } + uint32_t length = lines->Length(); + MOZ_ASSERT(length > 0, + "Line starts shouldn't be in cache if there aren't any"); + if (length == 0 || (length == 1 && (*lines)[0] == 0)) { + // This means the text begins and occupies a single line. Again, the Bounds + // check above is sufficient. + return true; + } + // Walk the lines of the text. Even if this text doesn't start at the + // beginning of a line (i.e. lines[0] > 0), we always want to consider its + // first line. + int32_t lineStart = 0; + for (uint32_t index = 0; index <= length; ++index) { + int32_t lineEnd; + if (index < length) { + int32_t nextLineStart = (*lines)[index]; + if (nextLineStart == 0) { + // This Accessible starts at the beginning of a line. Here, we always + // treat 0 as the first line start anyway. + MOZ_ASSERT(index == 0); + continue; + } + lineEnd = nextLineStart - 1; + } else { + // This is the last line. + lineEnd = static_cast<int32_t>(nsAccUtils::TextLength(this)) - 1; + } + MOZ_ASSERT(lineEnd >= lineStart); + nsRect lineRect = GetCachedCharRect(lineStart); + if (lineEnd > lineStart) { + lineRect.UnionRect(lineRect, GetCachedCharRect(lineEnd)); + } + if (BoundsWithOffset(Some(lineRect), true).Contains(aX, aY)) { + return true; + } + lineStart = lineEnd + 1; + } + return false; +} + +template <class Derived> +RemoteAccessible* RemoteAccessibleBase<Derived>::DoFuzzyHittesting() { + uint32_t childCount = ChildCount(); + if (!childCount) { + return nullptr; + } + // Check if this match has a clipped child. + // This usually indicates invisible text, and we're + // interested in returning the inner text content + // even if it doesn't contain the point we're hittesting. + RemoteAccessible* clippedContainer = nullptr; + for (uint32_t i = 0; i < childCount; i++) { + RemoteAccessible* child = RemoteChildAt(i); + if (child->Role() == roles::TEXT_CONTAINER) { + if (child->IsClipped()) { + clippedContainer = child; + break; + } + } + } + // If we found a clipped container, descend it in search of + // meaningful text leaves. Ignore non-text-leaf/text-container + // siblings. + RemoteAccessible* container = clippedContainer; + while (container) { + RemoteAccessible* textLeaf = nullptr; + bool continueSearch = false; + childCount = container->ChildCount(); + for (uint32_t i = 0; i < childCount; i++) { + RemoteAccessible* child = container->RemoteChildAt(i); + if (child->Role() == roles::TEXT_CONTAINER) { + container = child; + continueSearch = true; + break; + } + if (child->IsTextLeaf()) { + textLeaf = child; + // Don't break here -- it's possible a text container + // exists as another sibling, and we should descend as + // deep as possible. + } + } + if (textLeaf) { + return textLeaf; + } + if (!continueSearch) { + // We didn't find anything useful in this set of siblings. + // Don't keep searching + break; + } + } + return nullptr; +} + +template <class Derived> +Accessible* RemoteAccessibleBase<Derived>::ChildAtPoint( + int32_t aX, int32_t aY, LocalAccessible::EWhichChildAtPoint aWhichChild) { + // Elements that are partially on-screen should have their bounds masked by + // their containing scroll area so hittesting yields results that are + // consistent with the content's visual representation. Pass this value to + // bounds calculation functions to indicate that we're hittesting. + const bool hitTesting = true; + + if (IsOuterDoc() && aWhichChild == EWhichChildAtPoint::DirectChild) { + // This is an iframe, which is as deep as the viewport cache goes. The + // caller wants a direct child, which can only be the embedded document. + if (BoundsWithOffset(Nothing(), hitTesting).Contains(aX, aY)) { + return RemoteFirstChild(); + } + return nullptr; + } + + RemoteAccessible* lastMatch = nullptr; + // If `this` is a document, use its viewport cache instead of + // the cache of its parent document. + if (DocAccessibleParent* doc = IsDoc() ? AsDoc() : mDoc) { + if (!doc->mCachedFields) { + // A client call might arrive after we've constructed doc but before we + // get a cache push for it. + return nullptr; + } + if (auto maybeViewportCache = + doc->mCachedFields->GetAttribute<nsTArray<uint64_t>>( + nsGkAtoms::viewport)) { + // The retrieved viewport cache contains acc IDs in hittesting order. + // That is, items earlier in the list have z-indexes that are larger than + // those later in the list. If you were to build a tree by z-index, where + // chilren have larger z indices than their parents, iterating this list + // is essentially a postorder tree traversal. + const nsTArray<uint64_t>& viewportCache = *maybeViewportCache; + + for (auto id : viewportCache) { + RemoteAccessible* acc = doc->GetAccessible(id); + if (!acc) { + // This can happen if the acc died in between + // pushing the viewport cache and doing this hittest + continue; + } + + if (acc->IsOuterDoc() && + aWhichChild == EWhichChildAtPoint::DeepestChild && + acc->BoundsWithOffset(Nothing(), hitTesting).Contains(aX, aY)) { + // acc is an iframe, which is as deep as the viewport cache goes. This + // iframe contains the requested point. + RemoteAccessible* innerDoc = acc->RemoteFirstChild(); + if (innerDoc) { + MOZ_ASSERT(innerDoc->IsDoc()); + // Search the embedded document's viewport cache so we return the + // deepest descendant in that embedded document. + Accessible* deepestAcc = innerDoc->ChildAtPoint( + aX, aY, EWhichChildAtPoint::DeepestChild); + MOZ_ASSERT(!deepestAcc || deepestAcc->IsRemote()); + lastMatch = deepestAcc ? deepestAcc->AsRemote() : nullptr; + break; + } + // If there is no embedded document, the iframe itself is the deepest + // descendant. + lastMatch = acc; + break; + } + + if (acc == this) { + MOZ_ASSERT(!acc->IsOuterDoc()); + // Even though we're searching from the doc's cache + // this call shouldn't pass the boundary defined by + // the acc this call originated on. If we hit `this`, + // return our most recent match. + if (!lastMatch && + BoundsWithOffset(Nothing(), hitTesting).Contains(aX, aY)) { + // If we haven't found a match, but `this` contains the point we're + // looking for, set it as our temp last match so we can + // (potentially) do fuzzy hittesting on it below. + lastMatch = acc; + } + break; + } + + if (acc->ContainsPoint(aX, aY)) { + // Because our rects are in hittesting order, the + // first match we encounter is guaranteed to be the + // deepest match. + lastMatch = acc; + break; + } + } + if (lastMatch) { + RemoteAccessible* fuzzyMatch = lastMatch->DoFuzzyHittesting(); + lastMatch = fuzzyMatch ? fuzzyMatch : lastMatch; + } + } + } + + if (aWhichChild == EWhichChildAtPoint::DirectChild && lastMatch) { + // lastMatch is the deepest match. Walk up to the direct child of this. + RemoteAccessible* parent = lastMatch->RemoteParent(); + for (;;) { + if (parent == this) { + break; + } + if (!parent || parent->IsDoc()) { + // `this` is not an ancestor of lastMatch. Ignore lastMatch. + lastMatch = nullptr; + break; + } + lastMatch = parent; + parent = parent->RemoteParent(); + } + } else if (aWhichChild == EWhichChildAtPoint::DeepestChild && lastMatch && + !IsDoc() && !IsAncestorOf(lastMatch)) { + // If we end up with a match that is not in the ancestor chain + // of the accessible this call originated on, we should ignore it. + // This can happen when the aX, aY given are outside `this`. + lastMatch = nullptr; + } + + if (!lastMatch && BoundsWithOffset(Nothing(), hitTesting).Contains(aX, aY)) { + // Even though the hit target isn't inside `this`, the point is still + // within our bounds, so fall back to `this`. + return this; + } + + return lastMatch; +} + +template <class Derived> +Maybe<nsRect> RemoteAccessibleBase<Derived>::RetrieveCachedBounds() const { + if (!mCachedFields) { + return Nothing(); + } + + Maybe<const nsTArray<int32_t>&> maybeArray = + mCachedFields->GetAttribute<nsTArray<int32_t>>(nsGkAtoms::relativeBounds); + if (maybeArray) { + const nsTArray<int32_t>& relativeBoundsArr = *maybeArray; + MOZ_ASSERT(relativeBoundsArr.Length() == 4, + "Incorrectly sized bounds array"); + nsRect relativeBoundsRect(relativeBoundsArr[0], relativeBoundsArr[1], + relativeBoundsArr[2], relativeBoundsArr[3]); + return Some(relativeBoundsRect); + } + + return Nothing(); +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::ApplyCrossDocOffset(nsRect& aBounds) const { + if (!IsDoc()) { + // We should only apply cross-doc offsets to documents. If we're anything + // else, return early here. + return; + } + + RemoteAccessible* parentAcc = RemoteParent(); + if (!parentAcc || !parentAcc->IsOuterDoc()) { + return; + } + + Maybe<const nsTArray<int32_t>&> maybeOffset = + parentAcc->mCachedFields->GetAttribute<nsTArray<int32_t>>( + nsGkAtoms::crossorigin); + if (!maybeOffset) { + return; + } + + MOZ_ASSERT(maybeOffset->Length() == 2); + const nsTArray<int32_t>& offset = *maybeOffset; + // Our retrieved value is in app units, so we don't need to do any + // unit conversion here. + aBounds.MoveBy(offset[0], offset[1]); +} + +template <class Derived> +bool RemoteAccessibleBase<Derived>::ApplyTransform( + nsRect& aCumulativeBounds) const { + // First, attempt to retrieve the transform from the cache. + Maybe<const UniquePtr<gfx::Matrix4x4>&> maybeTransform = + mCachedFields->GetAttribute<UniquePtr<gfx::Matrix4x4>>( + nsGkAtoms::transform); + if (!maybeTransform) { + return false; + } + + auto mtxInPixels = gfx::Matrix4x4Typed<CSSPixel, CSSPixel>::FromUnknownMatrix( + *(*maybeTransform)); + + // Our matrix is in CSS Pixels, so we need our rect to be in CSS + // Pixels too. Convert before applying. + auto boundsInPixels = CSSRect::FromAppUnits(aCumulativeBounds); + boundsInPixels = mtxInPixels.TransformBounds(boundsInPixels); + aCumulativeBounds = CSSRect::ToAppUnits(boundsInPixels); + + return true; +} + +template <class Derived> +bool RemoteAccessibleBase<Derived>::ApplyScrollOffset(nsRect& aBounds) const { + Maybe<const nsTArray<int32_t>&> maybeScrollPosition = + mCachedFields->GetAttribute<nsTArray<int32_t>>(nsGkAtoms::scrollPosition); + + if (!maybeScrollPosition || maybeScrollPosition->Length() != 2) { + return false; + } + // Our retrieved value is in app units, so we don't need to do any + // unit conversion here. + const nsTArray<int32_t>& scrollPosition = *maybeScrollPosition; + + // Scroll position is an inverse representation of scroll offset (since the + // further the scroll bar moves down the page, the further the page content + // moves up/closer to the origin). + nsPoint scrollOffset(-scrollPosition[0], -scrollPosition[1]); + + aBounds.MoveBy(scrollOffset.x, scrollOffset.y); + + // Return true here even if the scroll offset was 0,0 because the RV is used + // as a scroll container indicator. Non-scroll containers won't have cached + // scroll position. + return true; +} + +template <class Derived> +nsRect RemoteAccessibleBase<Derived>::BoundsInAppUnits() const { + if (dom::CanonicalBrowsingContext* cbc = mDoc->GetBrowsingContext()->Top()) { + if (dom::BrowserParent* bp = cbc->GetBrowserParent()) { + DocAccessibleParent* topDoc = bp->GetTopLevelDocAccessible(); + if (topDoc && topDoc->mCachedFields) { + auto appUnitsPerDevPixel = topDoc->mCachedFields->GetAttribute<int32_t>( + nsGkAtoms::_moz_device_pixel_ratio); + MOZ_ASSERT(appUnitsPerDevPixel); + return LayoutDeviceIntRect::ToAppUnits(Bounds(), *appUnitsPerDevPixel); + } + } + } + return LayoutDeviceIntRect::ToAppUnits(Bounds(), AppUnitsPerCSSPixel()); +} + +template <class Derived> +bool RemoteAccessibleBase<Derived>::IsFixedPos() const { + MOZ_ASSERT(mCachedFields); + if (auto maybePosition = + mCachedFields->GetAttribute<RefPtr<nsAtom>>(nsGkAtoms::position)) { + return *maybePosition == nsGkAtoms::fixed; + } + + return false; +} + +template <class Derived> +bool RemoteAccessibleBase<Derived>::IsOverflowHidden() const { + MOZ_ASSERT(mCachedFields); + if (auto maybeOverflow = + mCachedFields->GetAttribute<RefPtr<nsAtom>>(nsGkAtoms::overflow)) { + return *maybeOverflow == nsGkAtoms::hidden; + } + + return false; +} + +template <class Derived> +bool RemoteAccessibleBase<Derived>::IsClipped() const { + MOZ_ASSERT(mCachedFields); + if (mCachedFields->GetAttribute<bool>(nsGkAtoms::clip_rule)) { + return true; + } + + return false; +} + +template <class Derived> +LayoutDeviceIntRect RemoteAccessibleBase<Derived>::BoundsWithOffset( + Maybe<nsRect> aOffset, bool aBoundsAreForHittesting) const { + Maybe<nsRect> maybeBounds = RetrieveCachedBounds(); + if (maybeBounds) { + nsRect bounds = *maybeBounds; + // maybeBounds is parent-relative. However, the transform matrix we cache + // (if any) is meant to operate on self-relative rects. Therefore, make + // bounds self-relative until after we transform. + bounds.MoveTo(0, 0); + const DocAccessibleParent* topDoc = IsDoc() ? AsDoc() : nullptr; + + if (aOffset.isSome()) { + // The rect we've passed in is in app units, so no conversion needed. + nsRect internalRect = *aOffset; + bounds.SetRectX(bounds.x + internalRect.x, internalRect.width); + bounds.SetRectY(bounds.y + internalRect.y, internalRect.height); + } + + Unused << ApplyTransform(bounds); + // Now apply the parent-relative offset. + bounds.MoveBy(maybeBounds->TopLeft()); + + ApplyCrossDocOffset(bounds); + + LayoutDeviceIntRect devPxBounds; + const Accessible* acc = Parent(); + bool encounteredFixedContainer = IsFixedPos(); + while (acc && acc->IsRemote()) { + // Return early if we're hit testing and our cumulative bounds are empty, + // since walking the ancestor chain won't produce any hits. + if (aBoundsAreForHittesting && bounds.IsEmpty()) { + return LayoutDeviceIntRect{}; + } + + RemoteAccessible* remoteAcc = const_cast<Accessible*>(acc)->AsRemote(); + + if (Maybe<nsRect> maybeRemoteBounds = remoteAcc->RetrieveCachedBounds()) { + nsRect remoteBounds = *maybeRemoteBounds; + // We need to take into account a non-1 resolution set on the + // presshell. This happens with async pinch zooming, among other + // things. We can't reliably query this value in the parent process, + // so we retrieve it from the document's cache. + if (remoteAcc->IsDoc()) { + // Apply the document's resolution to the bounds we've gathered + // thus far. We do this before applying the document's offset + // because document accs should not have their bounds scaled by + // their own resolution. They should be scaled by the resolution + // of their containing document (if any). + Maybe<float> res = + remoteAcc->AsDoc()->mCachedFields->GetAttribute<float>( + nsGkAtoms::resolution); + MOZ_ASSERT(res, "No cached document resolution found."); + bounds.ScaleRoundOut(res.valueOr(1.0f)); + + topDoc = remoteAcc->AsDoc(); + } + + // We don't account for the document offset of iframes when + // computing parent-relative bounds. Instead, we store this value + // separately on all iframes and apply it here. See the comments in + // LocalAccessible::BundleFieldsForCache where we set the + // nsGkAtoms::crossorigin attribute. + remoteAcc->ApplyCrossDocOffset(remoteBounds); + if (!encounteredFixedContainer) { + // Apply scroll offset, if applicable. Only the contents of an + // element are affected by its scroll offset, which is why this call + // happens in this loop instead of both inside and outside of + // the loop (like ApplyTransform). + // Never apply scroll offsets past a fixed container. + const bool hasScrollArea = remoteAcc->ApplyScrollOffset(bounds); + + // If we are hit testing and the Accessible has a scroll area, ensure + // that the bounds we've calculated so far are constrained to the + // bounds of the scroll area. Without this, we'll "hit" the off-screen + // portions of accs that are are partially (but not fully) within the + // scroll area. This is also a problem for accs with overflow:hidden; + if (aBoundsAreForHittesting && + (hasScrollArea || remoteAcc->IsOverflowHidden())) { + nsRect selfRelativeVisibleBounds(0, 0, remoteBounds.width, + remoteBounds.height); + bounds = bounds.SafeIntersect(selfRelativeVisibleBounds); + } + } + if (remoteAcc->IsDoc()) { + // Fixed elements are document relative, so if we've hit a + // document we're now subject to that document's styling + // (including scroll offsets that operate on it). + // This ordering is important, we don't want to apply scroll + // offsets on this doc's content. + encounteredFixedContainer = false; + } + if (!encounteredFixedContainer) { + // The transform matrix we cache (if any) is meant to operate on + // self-relative rects. Therefore, we must apply the transform before + // we make bounds parent-relative. + Unused << remoteAcc->ApplyTransform(bounds); + // Regardless of whether this is a doc, we should offset `bounds` + // by the bounds retrieved here. This is how we build screen + // coordinates from relative coordinates. + bounds.MoveBy(remoteBounds.X(), remoteBounds.Y()); + } + + if (remoteAcc->IsFixedPos()) { + encounteredFixedContainer = true; + } + // we can't just break here if we're scroll suppressed because we still + // need to find the top doc. + } + acc = acc->Parent(); + } + + MOZ_ASSERT(topDoc); + if (topDoc) { + // We use the top documents app-units-per-dev-pixel even though + // theoretically nested docs can have different values. Practically, + // that isn't likely since we only offer zoom controls for the top + // document and all subdocuments inherit from it. + auto appUnitsPerDevPixel = topDoc->mCachedFields->GetAttribute<int32_t>( + nsGkAtoms::_moz_device_pixel_ratio); + MOZ_ASSERT(appUnitsPerDevPixel); + if (appUnitsPerDevPixel) { + // Convert our existing `bounds` rect from app units to dev pixels + devPxBounds = LayoutDeviceIntRect::FromAppUnitsToNearest( + bounds, *appUnitsPerDevPixel); + } + } + +#if !defined(ANDROID) + // This block is not thread safe because it queries a LocalAccessible. + // It is also not needed in Android since the only local accessible is + // the outer doc browser that has an offset of 0. + // acc could be null if the OuterDocAccessible died before the top level + // DocAccessibleParent. + if (LocalAccessible* localAcc = + acc ? const_cast<Accessible*>(acc)->AsLocal() : nullptr) { + // LocalAccessible::Bounds returns screen-relative bounds in + // dev pixels. + LayoutDeviceIntRect localBounds = localAcc->Bounds(); + + // The root document will always have an APZ resolution of 1, + // so we don't factor in its scale here. We also don't scale + // by GetFullZoom because LocalAccessible::Bounds already does + // that. + devPxBounds.MoveBy(localBounds.X(), localBounds.Y()); + } +#endif + + return devPxBounds; + } + + return LayoutDeviceIntRect(); +} + +template <class Derived> +LayoutDeviceIntRect RemoteAccessibleBase<Derived>::Bounds() const { + return BoundsWithOffset(Nothing()); +} + +template <class Derived> +Relation RemoteAccessibleBase<Derived>::RelationByType( + RelationType aType) const { + // We are able to handle some relations completely in the + // parent process, without the help of the cache. Those + // relations are enumerated here. Other relations, whose + // types are stored in kRelationTypeAtoms, are processed + // below using the cache. + if (aType == RelationType::CONTAINING_TAB_PANE) { + if (dom::CanonicalBrowsingContext* cbc = mDoc->GetBrowsingContext()) { + if (dom::CanonicalBrowsingContext* topCbc = cbc->Top()) { + if (dom::BrowserParent* bp = topCbc->GetBrowserParent()) { + return Relation(bp->GetTopLevelDocAccessible()); + } + } + } + return Relation(); + } + + if (aType == RelationType::LINKS_TO && Role() == roles::LINK) { + Pivot p = Pivot(mDoc); + nsString href; + Value(href); + int32_t i = href.FindChar('#'); + int32_t len = static_cast<int32_t>(href.Length()); + if (i != -1 && i < (len - 1)) { + nsDependentSubstring anchorName = Substring(href, i + 1, len); + MustPruneSameDocRule rule; + Accessible* nameMatch = nullptr; + for (Accessible* match = p.Next(mDoc, rule); match; + match = p.Next(match, rule)) { + nsString currID; + match->DOMNodeID(currID); + MOZ_ASSERT(match->IsRemote()); + if (anchorName.Equals(currID)) { + return Relation(match->AsRemote()); + } + if (!nameMatch) { + nsString currName = match->AsRemote()->GetCachedHTMLNameAttribute(); + if (match->TagName() == nsGkAtoms::a && anchorName.Equals(currName)) { + // If we find an element with a matching ID, we should return + // that, but if we don't we should return the first anchor with + // a matching name. To avoid doing two traversals, store the first + // name match here. + nameMatch = match; + } + } + } + return nameMatch ? Relation(nameMatch->AsRemote()) : Relation(); + } + + return Relation(); + } + + // Handle ARIA tree, treegrid parent/child relations. Each of these cases + // relies on cached group info. To find the parent of an accessible, use the + // unified conceptual parent. + if (aType == RelationType::NODE_CHILD_OF) { + const nsRoleMapEntry* roleMapEntry = ARIARoleMap(); + if (roleMapEntry && (roleMapEntry->role == roles::OUTLINEITEM || + roleMapEntry->role == roles::LISTITEM || + roleMapEntry->role == roles::ROW)) { + if (const AccGroupInfo* groupInfo = + const_cast<RemoteAccessibleBase<Derived>*>(this) + ->GetOrCreateGroupInfo()) { + return Relation(groupInfo->ConceptualParent()); + } + } + return Relation(); + } + + // To find the children of a parent, provide an iterator through its items. + if (aType == RelationType::NODE_PARENT_OF) { + const nsRoleMapEntry* roleMapEntry = ARIARoleMap(); + if (roleMapEntry && (roleMapEntry->role == roles::OUTLINEITEM || + roleMapEntry->role == roles::LISTITEM || + roleMapEntry->role == roles::ROW || + roleMapEntry->role == roles::OUTLINE || + roleMapEntry->role == roles::LIST || + roleMapEntry->role == roles::TREE_TABLE)) { + return Relation(new ItemIterator(this)); + } + return Relation(); + } + + if (aType == RelationType::MEMBER_OF) { + Relation rel = Relation(); + // HTML radio buttons with cached names should be grouped. + if (IsHTMLRadioButton()) { + nsString name = GetCachedHTMLNameAttribute(); + if (name.IsEmpty()) { + return rel; + } + + RemoteAccessible* ancestor = RemoteParent(); + while (ancestor && ancestor->Role() != roles::FORM && ancestor != mDoc) { + ancestor = ancestor->RemoteParent(); + } + if (ancestor) { + // Sometimes we end up with an unparented acc here, potentially + // because the acc is being moved. See bug 1807639. + // Pivot expects to be created with a non-null mRoot. + Pivot p = Pivot(ancestor); + PivotRadioNameRule rule(name); + Accessible* match = p.Next(ancestor, rule); + while (match) { + rel.AppendTarget(match->AsRemote()); + match = p.Next(match, rule); + } + } + return rel; + } + + if (IsARIARole(nsGkAtoms::radio)) { + // ARIA radio buttons should be grouped by their radio group + // parent, if one exists. + RemoteAccessible* currParent = RemoteParent(); + while (currParent && currParent->Role() != roles::RADIO_GROUP) { + currParent = currParent->RemoteParent(); + } + + if (currParent && currParent->Role() == roles::RADIO_GROUP) { + // If we found a radiogroup parent, search for all + // roles::RADIOBUTTON children and add them to our relation. + // This search will include the radio button this method + // was called from, which is expected. + Pivot p = Pivot(currParent); + PivotRoleRule rule(roles::RADIOBUTTON); + Accessible* match = p.Next(currParent, rule); + while (match) { + MOZ_ASSERT(match->IsRemote(), + "We should only be traversing the remote tree."); + rel.AppendTarget(match->AsRemote()); + match = p.Next(match, rule); + } + } + } + // By webkit's standard, aria radio buttons do not get grouped + // if they lack a group parent, so we return an empty + // relation here if the above check fails. + return rel; + } + + Relation rel; + if (!mCachedFields) { + return rel; + } + + for (const auto& data : kRelationTypeAtoms) { + if (data.mType != aType || + (data.mValidTag && TagName() != data.mValidTag)) { + continue; + } + + if (auto maybeIds = + mCachedFields->GetAttribute<nsTArray<uint64_t>>(data.mAtom)) { + rel.AppendIter(new RemoteAccIterator(*maybeIds, Document())); + } + // Each relation type has only one relevant cached attribute, + // so break after we've handled the attr for this type, + // even if we didn't find any targets. + break; + } + + if (auto accRelMapEntry = mDoc->mReverseRelations.Lookup(ID())) { + if (auto reverseIdsEntry = accRelMapEntry.Data().Lookup(aType)) { + rel.AppendIter(new RemoteAccIterator(reverseIdsEntry.Data(), Document())); + } + } + + // We handle these relations here rather than before cached relations because + // the cached relations need to take precedence. For example, a <figure> with + // both aria-labelledby and a <figcaption> must return two LABELLED_BY + // targets: the aria-labelledby and then the <figcaption>. + if (aType == RelationType::LABELLED_BY && TagName() == nsGkAtoms::figure) { + uint32_t count = ChildCount(); + for (uint32_t c = 0; c < count; ++c) { + RemoteAccessible* child = RemoteChildAt(c); + MOZ_ASSERT(child); + if (child->TagName() == nsGkAtoms::figcaption) { + rel.AppendTarget(child); + } + } + } else if (aType == RelationType::LABEL_FOR && + TagName() == nsGkAtoms::figcaption) { + if (RemoteAccessible* parent = RemoteParent()) { + if (parent->TagName() == nsGkAtoms::figure) { + rel.AppendTarget(parent); + } + } + } + + return rel; +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::AppendTextTo(nsAString& aText, + uint32_t aStartOffset, + uint32_t aLength) { + if (IsText()) { + if (mCachedFields) { + if (auto text = mCachedFields->GetAttribute<nsString>(nsGkAtoms::text)) { + aText.Append(Substring(*text, aStartOffset, aLength)); + } + VERIFY_CACHE(CacheDomain::Text); + } + return; + } + + if (aStartOffset != 0 || aLength == 0) { + return; + } + + if (IsHTMLBr()) { + aText += kForcedNewLineChar; + } else if (RemoteParent() && nsAccUtils::MustPrune(RemoteParent())) { + // Expose the embedded object accessible as imaginary embedded object + // character if its parent hypertext accessible doesn't expose children to + // AT. + aText += kImaginaryEmbeddedObjectChar; + } else { + aText += kEmbeddedObjectChar; + } +} + +template <class Derived> +nsTArray<bool> RemoteAccessibleBase<Derived>::PreProcessRelations( + AccAttributes* aFields) { + nsTArray<bool> updateTracker(ArrayLength(kRelationTypeAtoms)); + for (auto const& data : kRelationTypeAtoms) { + if (data.mValidTag) { + // The relation we're currently processing only applies to particular + // elements. Check to see if we're one of them. + nsAtom* tag = TagName(); + if (!tag) { + // TagName() returns null on an initial cache push -- check aFields + // for a tag name instead. + if (auto maybeTag = + aFields->GetAttribute<RefPtr<nsAtom>>(nsGkAtoms::tag)) { + tag = *maybeTag; + } + } + MOZ_ASSERT( + tag || IsTextLeaf() || IsDoc(), + "Could not fetch tag via TagName() or from initial cache push!"); + if (tag != data.mValidTag) { + // If this rel doesn't apply to us, do no pre-processing. Also, + // note in our updateTracker that we should do no post-processing. + updateTracker.AppendElement(false); + continue; + } + } + + nsStaticAtom* const relAtom = data.mAtom; + auto newRelationTargets = + aFields->GetAttribute<nsTArray<uint64_t>>(relAtom); + bool shouldAddNewImplicitRels = + newRelationTargets && newRelationTargets->Length(); + + // Remove existing implicit relations if we need to perform an update, or + // if we've recieved a DeleteEntry(). Only do this if mCachedFields is + // initialized. If mCachedFields is not initialized, we still need to + // construct the update array so we correctly handle reverse rels in + // PostProcessRelations. + if ((shouldAddNewImplicitRels || + aFields->GetAttribute<DeleteEntry>(relAtom)) && + mCachedFields) { + if (auto maybeOldIDs = + mCachedFields->GetAttribute<nsTArray<uint64_t>>(relAtom)) { + for (uint64_t id : *maybeOldIDs) { + // For each target, fetch its reverse relation map + // We need to call `Lookup` here instead of `LookupOrInsert` because + // it's possible the ID we're querying is from an acc that has since + // been Shutdown(), and so has intentionally removed its reverse rels + // from the doc's reverse rel cache. + if (auto reverseRels = Document()->mReverseRelations.Lookup(id)) { + // Then fetch its reverse relation's ID list. This should be safe + // to do via LookupOrInsert because by the time we've gotten here, + // we know the acc and `this` are still alive in the doc. If we hit + // the following assert, we don't have parity on implicit/explicit + // rels and something is wrong. + nsTArray<uint64_t>& reverseRelIDs = + reverseRels->LookupOrInsert(data.mReverseType); + // There might be other reverse relations stored for this acc, so + // remove our ID instead of deleting the array entirely. + DebugOnly<bool> removed = reverseRelIDs.RemoveElement(ID()); + MOZ_ASSERT(removed, "Can't find old reverse relation"); + } + } + } + } + + updateTracker.AppendElement(shouldAddNewImplicitRels); + } + + return updateTracker; +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::PostProcessRelations( + const nsTArray<bool>& aToUpdate) { + size_t updateCount = aToUpdate.Length(); + MOZ_ASSERT(updateCount == ArrayLength(kRelationTypeAtoms), + "Did not note update status for every relation type!"); + for (size_t i = 0; i < updateCount; i++) { + if (aToUpdate.ElementAt(i)) { + // Since kRelationTypeAtoms was used to generate aToUpdate, we + // know the ith entry of aToUpdate corresponds to the relation type in + // the ith entry of kRelationTypeAtoms. Fetch the related data here. + auto const& data = kRelationTypeAtoms[i]; + + const nsTArray<uint64_t>& newIDs = + *mCachedFields->GetAttribute<nsTArray<uint64_t>>(data.mAtom); + for (uint64_t id : newIDs) { + nsTHashMap<RelationType, nsTArray<uint64_t>>& relations = + Document()->mReverseRelations.LookupOrInsert(id); + nsTArray<uint64_t>& ids = relations.LookupOrInsert(data.mReverseType); + ids.AppendElement(ID()); + } + } + } +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::PruneRelationsOnShutdown() { + auto reverseRels = mDoc->mReverseRelations.Lookup(ID()); + if (!reverseRels) { + return; + } + for (auto const& data : kRelationTypeAtoms) { + // Fetch the list of targets for this reverse relation + auto reverseTargetList = reverseRels->Lookup(data.mReverseType); + if (!reverseTargetList) { + continue; + } + for (uint64_t id : *reverseTargetList) { + // For each target, retrieve its corresponding forward relation target + // list + RemoteAccessible* affectedAcc = mDoc->GetAccessible(id); + if (!affectedAcc) { + // It's possible the affect acc also shut down, in which case + // we don't have anything to update. + continue; + } + if (auto forwardTargetList = + affectedAcc->mCachedFields + ->GetMutableAttribute<nsTArray<uint64_t>>(data.mAtom)) { + forwardTargetList->RemoveElement(ID()); + if (!forwardTargetList->Length()) { + // The ID we removed was the only thing in the list, so remove the + // entry from the cache entirely -- don't leave an empty array. + affectedAcc->mCachedFields->Remove(data.mAtom); + } + } + } + } + // Remove this ID from the document's map of reverse relations. + reverseRels.Remove(); +} + +template <class Derived> +uint32_t RemoteAccessibleBase<Derived>::GetCachedTextLength() { + MOZ_ASSERT(!HasChildren()); + if (!mCachedFields) { + return 0; + } + VERIFY_CACHE(CacheDomain::Text); + auto text = mCachedFields->GetAttribute<nsString>(nsGkAtoms::text); + if (!text) { + return 0; + } + return text->Length(); +} + +template <class Derived> +Maybe<const nsTArray<int32_t>&> +RemoteAccessibleBase<Derived>::GetCachedTextLines() { + MOZ_ASSERT(!HasChildren()); + if (!mCachedFields) { + return Nothing(); + } + VERIFY_CACHE(CacheDomain::Text); + return mCachedFields->GetAttribute<nsTArray<int32_t>>(nsGkAtoms::line); +} + +template <class Derived> +nsRect RemoteAccessibleBase<Derived>::GetCachedCharRect(int32_t aOffset) { + MOZ_ASSERT(IsText()); + if (!mCachedFields) { + return nsRect(); + } + + if (Maybe<const nsTArray<int32_t>&> maybeCharData = + mCachedFields->GetAttribute<nsTArray<int32_t>>( + nsGkAtoms::characterData)) { + const nsTArray<int32_t>& charData = *maybeCharData; + const int32_t index = aOffset * kNumbersInRect; + if (index < static_cast<int32_t>(charData.Length())) { + return nsRect(charData[index], charData[index + 1], charData[index + 2], + charData[index + 3]); + } + // It is valid for a client to call this with an offset 1 after the last + // character because of the insertion point at the end of text boxes. + MOZ_ASSERT(index == static_cast<int32_t>(charData.Length())); + } + + return nsRect(); +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::DOMNodeID(nsString& aID) const { + if (mCachedFields) { + mCachedFields->GetAttribute(nsGkAtoms::id, aID); + VERIFY_CACHE(CacheDomain::DOMNodeIDAndClass); + } +} + +template <class Derived> +RefPtr<const AccAttributes> +RemoteAccessibleBase<Derived>::GetCachedTextAttributes() { + MOZ_ASSERT(IsText() || IsHyperText()); + if (mCachedFields) { + auto attrs = + mCachedFields->GetAttributeRefPtr<AccAttributes>(nsGkAtoms::style); + VERIFY_CACHE(CacheDomain::Text); + return attrs; + } + return nullptr; +} + +template <class Derived> +already_AddRefed<AccAttributes> +RemoteAccessibleBase<Derived>::DefaultTextAttributes() { + RefPtr<const AccAttributes> attrs = GetCachedTextAttributes(); + RefPtr<AccAttributes> result = new AccAttributes(); + if (attrs) { + attrs->CopyTo(result); + } + return result.forget(); +} + +template <class Derived> +RefPtr<const AccAttributes> +RemoteAccessibleBase<Derived>::GetCachedARIAAttributes() const { + if (mCachedFields) { + auto attrs = + mCachedFields->GetAttributeRefPtr<AccAttributes>(nsGkAtoms::aria); + VERIFY_CACHE(CacheDomain::ARIA); + return attrs; + } + return nullptr; +} + +template <class Derived> +nsString RemoteAccessibleBase<Derived>::GetCachedHTMLNameAttribute() const { + if (mCachedFields) { + if (auto maybeName = + mCachedFields->GetAttribute<nsString>(nsGkAtoms::attributeName)) { + return *maybeName; + } + } + return nsString(); +} + +template <class Derived> +uint64_t RemoteAccessibleBase<Derived>::State() { + uint64_t state = 0; + if (mCachedFields) { + if (auto rawState = + mCachedFields->GetAttribute<uint64_t>(nsGkAtoms::state)) { + VERIFY_CACHE(CacheDomain::State); + state = *rawState; + // Handle states that are derived from other states. + if (!(state & states::UNAVAILABLE)) { + state |= states::ENABLED | states::SENSITIVE; + } + if (state & states::EXPANDABLE && !(state & states::EXPANDED)) { + state |= states::COLLAPSED; + } + } + + ApplyImplicitState(state); + + auto* cbc = mDoc->GetBrowsingContext(); + if (cbc && !cbc->IsActive()) { + // If our browsing context is _not_ active, we're in a background tab + // and inherently offscreen. + state |= states::OFFSCREEN; + } else { + // If we're in an active browsing context, there are a few scenarios we + // need to address: + // - We are an iframe document in the visual viewport + // - We are an iframe document out of the visual viewport + // - We are non-iframe content in the visual viewport + // - We are non-iframe content out of the visual viewport + // We assume top level tab docs are on screen if their BC is active, so + // we don't need additional handling for them here. + if (!mDoc->IsTopLevel()) { + // Here we handle iframes and iframe content. + // We use an iframe's outer doc's position in the embedding document's + // viewport to determine if the iframe has been scrolled offscreen. + Accessible* docParent = mDoc->Parent(); + // In rare cases, we might not have an outer doc yet. Return if that's + // the case. + if (NS_WARN_IF(!docParent || !docParent->IsRemote())) { + return state; + } + + RemoteAccessible* outerDoc = docParent->AsRemote(); + DocAccessibleParent* embeddingDocument = outerDoc->Document(); + if (embeddingDocument && + !embeddingDocument->mOnScreenAccessibles.Contains(outerDoc->ID())) { + // Our embedding document's viewport cache doesn't contain the ID of + // our outer doc, so this iframe (and any of its content) is + // offscreen. + state |= states::OFFSCREEN; + } else if (this != mDoc && !mDoc->mOnScreenAccessibles.Contains(ID())) { + // Our embedding document's viewport cache contains the ID of our + // outer doc, but the iframe's viewport cache doesn't contain our ID. + // We are offscreen. + state |= states::OFFSCREEN; + } + } else if (this != mDoc && !mDoc->mOnScreenAccessibles.Contains(ID())) { + // We are top level tab content (but not a top level tab doc). + // If our tab doc's viewport cache doesn't contain our ID, we're + // offscreen. + state |= states::OFFSCREEN; + } + } + } + + return state; +} + +template <class Derived> +already_AddRefed<AccAttributes> RemoteAccessibleBase<Derived>::Attributes() { + RefPtr<AccAttributes> attributes = new AccAttributes(); + nsAccessibilityService* accService = GetAccService(); + if (!accService) { + // The service can be shut down before RemoteAccessibles. If it is shut + // down, we can't calculate some attributes. We're about to die anyway. + return attributes.forget(); + } + + if (mCachedFields) { + // We use GetAttribute instead of GetAttributeRefPtr because we need + // nsAtom, not const nsAtom. + if (auto tag = + mCachedFields->GetAttribute<RefPtr<nsAtom>>(nsGkAtoms::tag)) { + attributes->SetAttribute(nsGkAtoms::tag, *tag); + } + + GroupPos groupPos = GroupPosition(); + nsAccUtils::SetAccGroupAttrs(attributes, groupPos.level, groupPos.setSize, + groupPos.posInSet); + + bool hierarchical = false; + uint32_t itemCount = AccGroupInfo::TotalItemCount(this, &hierarchical); + if (itemCount) { + attributes->SetAttribute(nsGkAtoms::child_item_count, + static_cast<int32_t>(itemCount)); + } + + if (hierarchical) { + attributes->SetAttribute(nsGkAtoms::tree, true); + } + + if (auto inputType = mCachedFields->GetAttribute<RefPtr<nsAtom>>( + nsGkAtoms::textInputType)) { + attributes->SetAttribute(nsGkAtoms::textInputType, *inputType); + } + + if (RefPtr<nsAtom> display = DisplayStyle()) { + attributes->SetAttribute(nsGkAtoms::display, display); + } + + if (TableCellAccessible* cell = AsTableCell()) { + TableAccessible* table = cell->Table(); + uint32_t row = cell->RowIdx(); + uint32_t col = cell->ColIdx(); + int32_t cellIdx = table->CellIndexAt(row, col); + if (cellIdx != -1) { + attributes->SetAttribute(nsGkAtoms::tableCellIndex, cellIdx); + } + } + + if (bool layoutGuess = TableIsProbablyForLayout()) { + attributes->SetAttribute(nsGkAtoms::layout_guess, layoutGuess); + } + + accService->MarkupAttributes(this, attributes); + + const nsRoleMapEntry* roleMap = ARIARoleMap(); + nsAutoString role; + mCachedFields->GetAttribute(nsGkAtoms::role, role); + if (role.IsEmpty()) { + if (roleMap && roleMap->roleAtom != nsGkAtoms::_empty) { + // Single, known role. + attributes->SetAttribute(nsGkAtoms::xmlroles, roleMap->roleAtom); + } else if (nsAtom* landmark = LandmarkRole()) { + // Landmark role from markup; e.g. HTML <main>. + attributes->SetAttribute(nsGkAtoms::xmlroles, landmark); + } + } else { + // Unknown role or multiple roles. + attributes->SetAttribute(nsGkAtoms::xmlroles, std::move(role)); + } + + if (roleMap) { + nsAutoString live; + if (nsAccUtils::GetLiveAttrValue(roleMap->liveAttRule, live)) { + attributes->SetAttribute(nsGkAtoms::aria_live, std::move(live)); + } + } + + if (auto ariaAttrs = GetCachedARIAAttributes()) { + ariaAttrs->CopyTo(attributes); + } + + nsAccUtils::SetLiveContainerAttributes(attributes, this); + + nsString id; + DOMNodeID(id); + if (!id.IsEmpty()) { + attributes->SetAttribute(nsGkAtoms::id, std::move(id)); + } + + nsString className; + mCachedFields->GetAttribute(nsGkAtoms::_class, className); + if (!className.IsEmpty()) { + attributes->SetAttribute(nsGkAtoms::_class, std::move(className)); + } + + if (IsImage()) { + nsString src; + mCachedFields->GetAttribute(nsGkAtoms::src, src); + if (!src.IsEmpty()) { + attributes->SetAttribute(nsGkAtoms::src, std::move(src)); + } + } + + if (IsTextField()) { + nsString placeholder; + mCachedFields->GetAttribute(nsGkAtoms::placeholder, placeholder); + if (!placeholder.IsEmpty()) { + attributes->SetAttribute(nsGkAtoms::placeholder, + std::move(placeholder)); + attributes->Remove(nsGkAtoms::aria_placeholder); + } + } + } + + nsAutoString name; + if (Name(name) != eNameFromSubtree && !name.IsVoid()) { + attributes->SetAttribute(nsGkAtoms::explicit_name, true); + } + + // Expose the string value via the valuetext attribute. We test for the value + // interface because we don't want to expose traditional Value() information + // such as URLs on links and documents, or text in an input. + // XXX This is only needed for ATK, since other APIs have native ways to + // retrieve value text. We should probably move this into ATK specific code. + // For now, we do this because LocalAccessible does it. + if (HasNumericValue()) { + nsString valuetext; + Value(valuetext); + attributes->SetAttribute(nsGkAtoms::aria_valuetext, std::move(valuetext)); + } + + return attributes.forget(); +} + +template <class Derived> +nsAtom* RemoteAccessibleBase<Derived>::TagName() const { + if (mCachedFields) { + if (auto tag = + mCachedFields->GetAttribute<RefPtr<nsAtom>>(nsGkAtoms::tag)) { + return *tag; + } + } + + return nullptr; +} + +template <class Derived> +already_AddRefed<nsAtom> RemoteAccessibleBase<Derived>::InputType() const { + if (mCachedFields) { + if (auto inputType = mCachedFields->GetAttribute<RefPtr<nsAtom>>( + nsGkAtoms::textInputType)) { + RefPtr<nsAtom> result = *inputType; + return result.forget(); + } + } + + return nullptr; +} + +template <class Derived> +already_AddRefed<nsAtom> RemoteAccessibleBase<Derived>::DisplayStyle() const { + if (mCachedFields) { + if (auto display = + mCachedFields->GetAttribute<RefPtr<nsAtom>>(nsGkAtoms::display)) { + RefPtr<nsAtom> result = *display; + return result.forget(); + } + } + return nullptr; +} + +template <class Derived> +float RemoteAccessibleBase<Derived>::Opacity() const { + if (mCachedFields) { + if (auto opacity = mCachedFields->GetAttribute<float>(nsGkAtoms::opacity)) { + return *opacity; + } + } + + return 1.0f; +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::LiveRegionAttributes( + nsAString* aLive, nsAString* aRelevant, Maybe<bool>* aAtomic, + nsAString* aBusy) const { + if (!mCachedFields) { + return; + } + RefPtr<const AccAttributes> attrs = GetCachedARIAAttributes(); + if (!attrs) { + return; + } + if (aLive) { + attrs->GetAttribute(nsGkAtoms::aria_live, *aLive); + } + if (aRelevant) { + attrs->GetAttribute(nsGkAtoms::aria_relevant, *aRelevant); + } + if (aAtomic) { + if (auto value = + attrs->GetAttribute<RefPtr<nsAtom>>(nsGkAtoms::aria_atomic)) { + *aAtomic = Some(*value == nsGkAtoms::_true); + } + } + if (aBusy) { + attrs->GetAttribute(nsGkAtoms::aria_busy, *aBusy); + } +} + +template <class Derived> +Maybe<bool> RemoteAccessibleBase<Derived>::ARIASelected() const { + if (mCachedFields) { + return mCachedFields->GetAttribute<bool>(nsGkAtoms::aria_selected); + } + return Nothing(); +} + +template <class Derived> +nsAtom* RemoteAccessibleBase<Derived>::GetPrimaryAction() const { + if (mCachedFields) { + if (auto action = + mCachedFields->GetAttribute<RefPtr<nsAtom>>(nsGkAtoms::action)) { + return *action; + } + } + + return nullptr; +} + +template <class Derived> +uint8_t RemoteAccessibleBase<Derived>::ActionCount() const { + uint8_t actionCount = 0; + if (mCachedFields) { + if (HasPrimaryAction() || ActionAncestor()) { + actionCount++; + } + + if (mCachedFields->HasAttribute(nsGkAtoms::longdesc)) { + actionCount++; + } + VERIFY_CACHE(CacheDomain::Actions); + } + + return actionCount; +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::ActionNameAt(uint8_t aIndex, + nsAString& aName) { + if (mCachedFields) { + aName.Truncate(); + nsAtom* action = GetPrimaryAction(); + bool hasActionAncestor = !action && ActionAncestor(); + + switch (aIndex) { + case 0: + if (action) { + action->ToString(aName); + } else if (hasActionAncestor) { + aName.AssignLiteral("click ancestor"); + } else if (mCachedFields->HasAttribute(nsGkAtoms::longdesc)) { + aName.AssignLiteral("showlongdesc"); + } + break; + case 1: + if ((action || hasActionAncestor) && + mCachedFields->HasAttribute(nsGkAtoms::longdesc)) { + aName.AssignLiteral("showlongdesc"); + } + break; + default: + break; + } + } + VERIFY_CACHE(CacheDomain::Actions); +} + +template <class Derived> +bool RemoteAccessibleBase<Derived>::DoAction(uint8_t aIndex) const { + if (ActionCount() < aIndex + 1) { + return false; + } + + Unused << mDoc->SendDoActionAsync(mID, aIndex); + return true; +} + +template <class Derived> +KeyBinding RemoteAccessibleBase<Derived>::AccessKey() const { + if (mCachedFields) { + if (auto value = + mCachedFields->GetAttribute<uint64_t>(nsGkAtoms::accesskey)) { + return KeyBinding(*value); + } + } + return KeyBinding(); +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::SelectionRanges( + nsTArray<TextRange>* aRanges) const { + Document()->SelectionRanges(aRanges); +} + +template <class Derived> +bool RemoteAccessibleBase<Derived>::RemoveFromSelection(int32_t aSelectionNum) { + MOZ_ASSERT(IsHyperText()); + if (SelectionCount() <= aSelectionNum) { + return false; + } + + Unused << mDoc->SendRemoveTextSelection(mID, aSelectionNum); + + return true; +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::ARIAGroupPosition( + int32_t* aLevel, int32_t* aSetSize, int32_t* aPosInSet) const { + if (!mCachedFields) { + return; + } + + if (aLevel) { + if (auto level = + mCachedFields->GetAttribute<int32_t>(nsGkAtoms::aria_level)) { + *aLevel = *level; + } + } + if (aSetSize) { + if (auto setsize = + mCachedFields->GetAttribute<int32_t>(nsGkAtoms::aria_setsize)) { + *aSetSize = *setsize; + } + } + if (aPosInSet) { + if (auto posinset = + mCachedFields->GetAttribute<int32_t>(nsGkAtoms::aria_posinset)) { + *aPosInSet = *posinset; + } + } +} + +template <class Derived> +AccGroupInfo* RemoteAccessibleBase<Derived>::GetGroupInfo() const { + if (!mCachedFields) { + return nullptr; + } + + if (auto groupInfo = mCachedFields->GetAttribute<UniquePtr<AccGroupInfo>>( + nsGkAtoms::group)) { + return groupInfo->get(); + } + + return nullptr; +} + +template <class Derived> +AccGroupInfo* RemoteAccessibleBase<Derived>::GetOrCreateGroupInfo() { + AccGroupInfo* groupInfo = GetGroupInfo(); + if (groupInfo) { + return groupInfo; + } + + groupInfo = AccGroupInfo::CreateGroupInfo(this); + if (groupInfo) { + if (!mCachedFields) { + mCachedFields = new AccAttributes(); + } + + mCachedFields->SetAttribute(nsGkAtoms::group, groupInfo); + } + + return groupInfo; +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::InvalidateGroupInfo() { + if (mCachedFields) { + mCachedFields->Remove(nsGkAtoms::group); + } +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::GetPositionAndSetSize(int32_t* aPosInSet, + int32_t* aSetSize) { + if (IsHTMLRadioButton()) { + *aSetSize = 0; + Relation rel = RelationByType(RelationType::MEMBER_OF); + while (Accessible* radio = rel.Next()) { + ++*aSetSize; + if (radio == this) { + *aPosInSet = *aSetSize; + } + } + return; + } + + Accessible::GetPositionAndSetSize(aPosInSet, aSetSize); +} + +template <class Derived> +bool RemoteAccessibleBase<Derived>::HasPrimaryAction() const { + return mCachedFields && mCachedFields->HasAttribute(nsGkAtoms::action); +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::TakeFocus() const { + Unused << mDoc->SendTakeFocus(mID); +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::ScrollTo(uint32_t aHow) const { + Unused << mDoc->SendScrollTo(mID, aHow); +} + +//////////////////////////////////////////////////////////////////////////////// +// SelectAccessible + +template <class Derived> +void RemoteAccessibleBase<Derived>::SelectedItems( + nsTArray<Accessible*>* aItems) { + Pivot p = Pivot(this); + PivotStateRule rule(states::SELECTED); + for (Accessible* selected = p.First(rule); selected; + selected = p.Next(selected, rule)) { + aItems->AppendElement(selected); + } +} + +template <class Derived> +uint32_t RemoteAccessibleBase<Derived>::SelectedItemCount() { + uint32_t count = 0; + Pivot p = Pivot(this); + PivotStateRule rule(states::SELECTED); + for (Accessible* selected = p.First(rule); selected; + selected = p.Next(selected, rule)) { + count++; + } + + return count; +} + +template <class Derived> +Accessible* RemoteAccessibleBase<Derived>::GetSelectedItem(uint32_t aIndex) { + uint32_t index = 0; + Accessible* selected = nullptr; + Pivot p = Pivot(this); + PivotStateRule rule(states::SELECTED); + for (selected = p.First(rule); selected && index < aIndex; + selected = p.Next(selected, rule)) { + index++; + } + + return selected; +} + +template <class Derived> +bool RemoteAccessibleBase<Derived>::IsItemSelected(uint32_t aIndex) { + uint32_t index = 0; + Accessible* selectable = nullptr; + Pivot p = Pivot(this); + PivotStateRule rule(states::SELECTABLE); + for (selectable = p.First(rule); selectable && index < aIndex; + selectable = p.Next(selectable, rule)) { + index++; + } + + return selectable && selectable->State() & states::SELECTED; +} + +template <class Derived> +bool RemoteAccessibleBase<Derived>::AddItemToSelection(uint32_t aIndex) { + uint32_t index = 0; + Accessible* selectable = nullptr; + Pivot p = Pivot(this); + PivotStateRule rule(states::SELECTABLE); + for (selectable = p.First(rule); selectable && index < aIndex; + selectable = p.Next(selectable, rule)) { + index++; + } + + if (selectable) selectable->SetSelected(true); + + return static_cast<bool>(selectable); +} + +template <class Derived> +bool RemoteAccessibleBase<Derived>::RemoveItemFromSelection(uint32_t aIndex) { + uint32_t index = 0; + Accessible* selectable = nullptr; + Pivot p = Pivot(this); + PivotStateRule rule(states::SELECTABLE); + for (selectable = p.First(rule); selectable && index < aIndex; + selectable = p.Next(selectable, rule)) { + index++; + } + + if (selectable) selectable->SetSelected(false); + + return static_cast<bool>(selectable); +} + +template <class Derived> +bool RemoteAccessibleBase<Derived>::SelectAll() { + if ((State() & states::MULTISELECTABLE) == 0) { + return false; + } + + bool success = false; + Accessible* selectable = nullptr; + Pivot p = Pivot(this); + PivotStateRule rule(states::SELECTABLE); + for (selectable = p.First(rule); selectable; + selectable = p.Next(selectable, rule)) { + success = true; + selectable->SetSelected(true); + } + return success; +} + +template <class Derived> +bool RemoteAccessibleBase<Derived>::UnselectAll() { + if ((State() & states::MULTISELECTABLE) == 0) { + return false; + } + + bool success = false; + Accessible* selectable = nullptr; + Pivot p = Pivot(this); + PivotStateRule rule(states::SELECTABLE); + for (selectable = p.First(rule); selectable; + selectable = p.Next(selectable, rule)) { + success = true; + selectable->SetSelected(false); + } + return success; +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::TakeSelection() { + Unused << mDoc->SendTakeSelection(mID); +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::SetSelected(bool aSelect) { + Unused << mDoc->SendSetSelected(mID, aSelect); +} + +template <class Derived> +TableAccessible* RemoteAccessibleBase<Derived>::AsTable() { + if (IsTable()) { + return CachedTableAccessible::GetFrom(this); + } + return nullptr; +} + +template <class Derived> +TableCellAccessible* RemoteAccessibleBase<Derived>::AsTableCell() { + if (IsTableCell()) { + return CachedTableCellAccessible::GetFrom(this); + } + return nullptr; +} + +template <class Derived> +bool RemoteAccessibleBase<Derived>::TableIsProbablyForLayout() { + if (mCachedFields) { + if (auto layoutGuess = + mCachedFields->GetAttribute<bool>(nsGkAtoms::layout_guess)) { + return *layoutGuess; + } + } + return false; +} + +template <class Derived> +nsTArray<int32_t>& RemoteAccessibleBase<Derived>::GetCachedHyperTextOffsets() { + if (mCachedFields) { + if (auto offsets = mCachedFields->GetMutableAttribute<nsTArray<int32_t>>( + nsGkAtoms::offset)) { + return *offsets; + } + } + nsTArray<int32_t> newOffsets; + if (!mCachedFields) { + mCachedFields = new AccAttributes(); + } + mCachedFields->SetAttribute(nsGkAtoms::offset, std::move(newOffsets)); + return *mCachedFields->GetMutableAttribute<nsTArray<int32_t>>( + nsGkAtoms::offset); +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::SetCaretOffset(int32_t aOffset) { + Unused << mDoc->SendSetCaretOffset(mID, aOffset); +} + +template <class Derived> +Maybe<int32_t> RemoteAccessibleBase<Derived>::GetIntARIAAttr( + nsAtom* aAttrName) const { + if (RefPtr<const AccAttributes> attrs = GetCachedARIAAttributes()) { + if (auto val = attrs->GetAttribute<int32_t>(aAttrName)) { + return val; + } + } + return Nothing(); +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::Language(nsAString& aLocale) { + if (!IsHyperText()) { + return; + } + if (auto attrs = GetCachedTextAttributes()) { + attrs->GetAttribute(nsGkAtoms::language, aLocale); + } +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::ReplaceText(const nsAString& aText) { + Unused << mDoc->SendReplaceText(mID, aText); +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::InsertText(const nsAString& aText, + int32_t aPosition) { + Unused << mDoc->SendInsertText(mID, aText, aPosition); +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::CopyText(int32_t aStartPos, + int32_t aEndPos) { + Unused << mDoc->SendCopyText(mID, aStartPos, aEndPos); +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::CutText(int32_t aStartPos, + int32_t aEndPos) { + Unused << mDoc->SendCutText(mID, aStartPos, aEndPos); +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::DeleteText(int32_t aStartPos, + int32_t aEndPos) { + Unused << mDoc->SendDeleteText(mID, aStartPos, aEndPos); +} + +template <class Derived> +void RemoteAccessibleBase<Derived>::PasteText(int32_t aPosition) { + Unused << mDoc->SendPasteText(mID, aPosition); +} + +template <class Derived> +size_t RemoteAccessibleBase<Derived>::SizeOfIncludingThis( + MallocSizeOf aMallocSizeOf) { + return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf); +} + +template <class Derived> +size_t RemoteAccessibleBase<Derived>::SizeOfExcludingThis( + MallocSizeOf aMallocSizeOf) { + size_t size = 0; + + // Count attributes. + if (mCachedFields) { + size += mCachedFields->SizeOfIncludingThis(aMallocSizeOf); + } + + // We don't recurse into mChildren because they're already counted in their + // document's mAccessibles. + size += mChildren.ShallowSizeOfExcludingThis(aMallocSizeOf); + + return size; +} + +template class RemoteAccessibleBase<RemoteAccessible>; + +} // namespace a11y +} // namespace mozilla |