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-rw-r--r--accessible/ipc/DocAccessibleChild.cpp431
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diff --git a/accessible/ipc/DocAccessibleChild.cpp b/accessible/ipc/DocAccessibleChild.cpp
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+/* -*- 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 "chrome/common/ipc_channel.h"
+#include "mozilla/a11y/DocAccessibleChild.h"
+#include "mozilla/a11y/CacheConstants.h"
+#include "mozilla/a11y/FocusManager.h"
+#include "mozilla/ipc/ProcessChild.h"
+#include "nsAccessibilityService.h"
+
+#include "LocalAccessible-inl.h"
+#ifdef A11Y_LOG
+# include "Logging.h"
+#endif
+#include "TextLeafRange.h"
+
+namespace mozilla {
+namespace a11y {
+
+/* static */
+void DocAccessibleChild::FlattenTree(LocalAccessible* aRoot,
+ nsTArray<LocalAccessible*>& aTree) {
+ MOZ_ASSERT(!aRoot->IsDoc(), "documents shouldn't be serialized");
+
+ aTree.AppendElement(aRoot);
+ // OuterDocAccessibles are special because we don't want to serialize the
+ // child doc here, we'll call PDocAccessibleConstructor in
+ // NotificationController.
+ uint32_t childCount = aRoot->IsOuterDoc() ? 0 : aRoot->ChildCount();
+
+ for (uint32_t i = 0; i < childCount; i++) {
+ FlattenTree(aRoot->LocalChildAt(i), aTree);
+ }
+}
+
+/* static */
+AccessibleData DocAccessibleChild::SerializeAcc(LocalAccessible* aAcc) {
+ uint32_t genericTypes = aAcc->mGenericTypes;
+ if (aAcc->ARIAHasNumericValue()) {
+ // XXX: We need to do this because this requires a state check.
+ genericTypes |= eNumericValue;
+ }
+ if (aAcc->IsTextLeaf() || aAcc->IsImage()) {
+ // Ideally, we'd set eActionable for any Accessible with an ancedstor
+ // action. However, that requires an ancestor walk which is too expensive
+ // here. eActionable is only used by ATK. For now, we only expose ancestor
+ // actions on text leaf and image Accessibles. This means that we don't
+ // support "click ancestor" for ATK.
+ if (aAcc->ActionCount()) {
+ genericTypes |= eActionable;
+ }
+ } else if (aAcc->HasPrimaryAction()) {
+ genericTypes |= eActionable;
+ }
+
+ RefPtr<AccAttributes> fields;
+ // Even though we send moves as a hide and a show, we don't want to
+ // push the cache again for moves.
+ if (!aAcc->Document()->IsAccessibleBeingMoved(aAcc)) {
+ fields =
+ aAcc->BundleFieldsForCache(CacheDomain::All, CacheUpdateType::Initial);
+ if (fields->Count() == 0) {
+ fields = nullptr;
+ }
+ }
+
+ return AccessibleData(aAcc->ID(), aAcc->Role(), aAcc->LocalParent()->ID(),
+ static_cast<int32_t>(aAcc->IndexInParent()),
+ static_cast<AccType>(aAcc->mType),
+ static_cast<AccGenericType>(genericTypes),
+ aAcc->mRoleMapEntryIndex, fields);
+}
+
+void DocAccessibleChild::InsertIntoIpcTree(LocalAccessible* aChild,
+ bool aSuppressShowEvent) {
+ nsTArray<LocalAccessible*> shownTree;
+ FlattenTree(aChild, shownTree);
+ uint32_t totalAccs = shownTree.Length();
+ // Exceeding the IPDL maximum message size will cause a crash. Try to avoid
+ // this by only including kMaxAccsPerMessage Accessibels in a single IPDL
+ // call. If there are Accessibles beyond this, they will be split across
+ // multiple calls.
+ constexpr uint32_t kMaxAccsPerMessage =
+ IPC::Channel::kMaximumMessageSize / (2 * 1024);
+ nsTArray<AccessibleData> data(std::min(kMaxAccsPerMessage, totalAccs));
+ for (LocalAccessible* child : shownTree) {
+ if (data.Length() == kMaxAccsPerMessage) {
+ if (ipc::ProcessChild::ExpectingShutdown()) {
+ return;
+ }
+ SendShowEvent(data, aSuppressShowEvent, false, false);
+ data.ClearAndRetainStorage();
+ }
+ data.AppendElement(SerializeAcc(child));
+ }
+ if (ipc::ProcessChild::ExpectingShutdown()) {
+ return;
+ }
+ if (!data.IsEmpty()) {
+ SendShowEvent(data, aSuppressShowEvent, true, false);
+ }
+}
+
+void DocAccessibleChild::ShowEvent(AccShowEvent* aShowEvent) {
+ LocalAccessible* child = aShowEvent->GetAccessible();
+ InsertIntoIpcTree(child, false);
+}
+
+mozilla::ipc::IPCResult DocAccessibleChild::RecvTakeFocus(const uint64_t& aID) {
+ LocalAccessible* acc = IdToAccessible(aID);
+ if (acc) {
+ acc->TakeFocus();
+ }
+ return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleChild::RecvScrollTo(
+ const uint64_t& aID, const uint32_t& aScrollType) {
+ LocalAccessible* acc = IdToAccessible(aID);
+ if (acc) {
+ RefPtr<PresShell> presShell = acc->Document()->PresShellPtr();
+ nsCOMPtr<nsIContent> content = acc->GetContent();
+ nsCoreUtils::ScrollTo(presShell, content, aScrollType);
+ }
+
+ return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleChild::RecvTakeSelection(
+ const uint64_t& aID) {
+ LocalAccessible* acc = IdToAccessible(aID);
+ if (acc) {
+ acc->TakeSelection();
+ }
+
+ return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleChild::RecvSetSelected(
+ const uint64_t& aID, const bool& aSelect) {
+ LocalAccessible* acc = IdToAccessible(aID);
+ if (acc) {
+ acc->SetSelected(aSelect);
+ }
+
+ return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleChild::RecvVerifyCache(
+ const uint64_t& aID, const uint64_t& aCacheDomain, AccAttributes* aFields) {
+#ifdef A11Y_LOG
+ LocalAccessible* acc = IdToAccessible(aID);
+ if (!acc) {
+ return IPC_OK();
+ }
+
+ RefPtr<AccAttributes> localFields =
+ acc->BundleFieldsForCache(aCacheDomain, CacheUpdateType::Update);
+ bool mismatches = false;
+
+ for (auto prop : *localFields) {
+ if (prop.Value<DeleteEntry>()) {
+ if (aFields->HasAttribute(prop.Name())) {
+ if (!mismatches) {
+ logging::MsgBegin("Mismatch!", "Local and remote values differ");
+ logging::AccessibleInfo("", acc);
+ mismatches = true;
+ }
+ nsAutoCString propName;
+ prop.Name()->ToUTF8String(propName);
+ nsAutoString val;
+ aFields->GetAttribute(prop.Name(), val);
+ logging::MsgEntry(
+ "Remote value for %s should be empty, but instead it is '%s'",
+ propName.get(), NS_ConvertUTF16toUTF8(val).get());
+ }
+ continue;
+ }
+
+ nsAutoString localVal;
+ prop.ValueAsString(localVal);
+ nsAutoString remoteVal;
+ aFields->GetAttribute(prop.Name(), remoteVal);
+ if (!localVal.Equals(remoteVal)) {
+ if (!mismatches) {
+ logging::MsgBegin("Mismatch!", "Local and remote values differ");
+ logging::AccessibleInfo("", acc);
+ mismatches = true;
+ }
+ nsAutoCString propName;
+ prop.Name()->ToUTF8String(propName);
+ logging::MsgEntry("Fields differ: %s '%s' != '%s'", propName.get(),
+ NS_ConvertUTF16toUTF8(remoteVal).get(),
+ NS_ConvertUTF16toUTF8(localVal).get());
+ }
+ }
+ if (mismatches) {
+ logging::MsgEnd();
+ }
+#endif // A11Y_LOG
+
+ return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleChild::RecvDoActionAsync(
+ const uint64_t& aID, const uint8_t& aIndex) {
+ if (LocalAccessible* acc = IdToAccessible(aID)) {
+ Unused << acc->DoAction(aIndex);
+ }
+
+ return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleChild::RecvSetCaretOffset(
+ const uint64_t& aID, const int32_t& aOffset) {
+ HyperTextAccessible* acc = IdToHyperTextAccessible(aID);
+ if (acc && acc->IsTextRole() && acc->IsValidOffset(aOffset)) {
+ acc->SetCaretOffset(aOffset);
+ }
+ return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleChild::RecvSetTextSelection(
+ const uint64_t& aStartID, const int32_t& aStartOffset,
+ const uint64_t& aEndID, const int32_t& aEndOffset,
+ const int32_t& aSelectionNum) {
+ TextLeafRange range(TextLeafPoint(IdToAccessible(aStartID), aStartOffset),
+ TextLeafPoint(IdToAccessible(aEndID), aEndOffset));
+ if (range) {
+ range.SetSelection(aSelectionNum);
+ }
+
+ return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleChild::RecvScrollTextLeafRangeIntoView(
+ const uint64_t& aStartID, const int32_t& aStartOffset,
+ const uint64_t& aEndID, const int32_t& aEndOffset,
+ const uint32_t& aScrollType) {
+ TextLeafRange range(TextLeafPoint(IdToAccessible(aStartID), aStartOffset),
+ TextLeafPoint(IdToAccessible(aEndID), aEndOffset));
+ if (range) {
+ range.ScrollIntoView(aScrollType);
+ }
+
+ return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleChild::RecvRemoveTextSelection(
+ const uint64_t& aID, const int32_t& aSelectionNum) {
+ HyperTextAccessible* acc = IdToHyperTextAccessible(aID);
+ if (acc && acc->IsTextRole()) {
+ acc->RemoveFromSelection(aSelectionNum);
+ }
+
+ return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleChild::RecvSetCurValue(
+ const uint64_t& aID, const double& aValue) {
+ LocalAccessible* acc = IdToAccessible(aID);
+ if (acc) {
+ acc->SetCurValue(aValue);
+ }
+
+ return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleChild::RecvReplaceText(
+ const uint64_t& aID, const nsAString& aText) {
+ HyperTextAccessible* acc = IdToHyperTextAccessible(aID);
+ if (acc && acc->IsTextRole()) {
+ acc->ReplaceText(aText);
+ }
+
+ return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleChild::RecvInsertText(
+ const uint64_t& aID, const nsAString& aText, const int32_t& aPosition) {
+ HyperTextAccessible* acc = IdToHyperTextAccessible(aID);
+ if (acc && acc->IsTextRole()) {
+ acc->InsertText(aText, aPosition);
+ }
+
+ return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleChild::RecvCopyText(
+ const uint64_t& aID, const int32_t& aStartPos, const int32_t& aEndPos) {
+ HyperTextAccessible* acc = IdToHyperTextAccessible(aID);
+ if (acc && acc->IsTextRole()) {
+ acc->CopyText(aStartPos, aEndPos);
+ }
+
+ return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleChild::RecvCutText(
+ const uint64_t& aID, const int32_t& aStartPos, const int32_t& aEndPos) {
+ HyperTextAccessible* acc = IdToHyperTextAccessible(aID);
+ if (acc && acc->IsTextRole()) {
+ acc->CutText(aStartPos, aEndPos);
+ }
+
+ return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleChild::RecvDeleteText(
+ const uint64_t& aID, const int32_t& aStartPos, const int32_t& aEndPos) {
+ HyperTextAccessible* acc = IdToHyperTextAccessible(aID);
+ if (acc && acc->IsTextRole()) {
+ acc->DeleteText(aStartPos, aEndPos);
+ }
+
+ return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleChild::RecvPasteText(
+ const uint64_t& aID, const int32_t& aPosition) {
+ RefPtr<HyperTextAccessible> acc = IdToHyperTextAccessible(aID);
+ if (acc && acc->IsTextRole()) {
+ acc->PasteText(aPosition);
+ }
+
+ return IPC_OK();
+}
+
+ipc::IPCResult DocAccessibleChild::RecvRestoreFocus() {
+ if (FocusManager* focusMgr = FocusMgr()) {
+ focusMgr->ForceFocusEvent();
+ }
+ return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DocAccessibleChild::RecvScrollToPoint(
+ const uint64_t& aID, const uint32_t& aScrollType, const int32_t& aX,
+ const int32_t& aY) {
+ LocalAccessible* acc = IdToAccessible(aID);
+ if (acc) {
+ acc->ScrollToPoint(aScrollType, aX, aY);
+ }
+
+ return IPC_OK();
+}
+
+LayoutDeviceIntRect DocAccessibleChild::GetCaretRectFor(const uint64_t& aID) {
+#if defined(XP_WIN)
+ LocalAccessible* target;
+
+ if (aID) {
+ target = reinterpret_cast<LocalAccessible*>(aID);
+ } else {
+ target = mDoc;
+ }
+
+ MOZ_ASSERT(target);
+
+ HyperTextAccessible* text = target->AsHyperText();
+ if (!text) {
+ return LayoutDeviceIntRect();
+ }
+
+ nsIWidget* widget = nullptr;
+ return text->GetCaretRect(&widget);
+#else
+ // The caret rect is only used on Windows, so just return an empty rect
+ // on other platforms.
+ return LayoutDeviceIntRect();
+#endif // defined(XP_WIN)
+}
+
+bool DocAccessibleChild::SendFocusEvent(const uint64_t& aID) {
+ return PDocAccessibleChild::SendFocusEvent(aID, GetCaretRectFor(aID));
+}
+
+bool DocAccessibleChild::SendCaretMoveEvent(const uint64_t& aID,
+ const int32_t& aOffset,
+ const bool& aIsSelectionCollapsed,
+ const bool& aIsAtEndOfLine,
+ const int32_t& aGranularity,
+ bool aFromUser) {
+ return PDocAccessibleChild::SendCaretMoveEvent(
+ aID, GetCaretRectFor(aID), aOffset, aIsSelectionCollapsed, aIsAtEndOfLine,
+ aGranularity, aFromUser);
+}
+
+#if !defined(XP_WIN)
+mozilla::ipc::IPCResult DocAccessibleChild::RecvAnnounce(
+ const uint64_t& aID, const nsAString& aAnnouncement,
+ const uint16_t& aPriority) {
+ LocalAccessible* acc = IdToAccessible(aID);
+ if (acc) {
+ acc->Announce(aAnnouncement, aPriority);
+ }
+
+ return IPC_OK();
+}
+#endif // !defined(XP_WIN)
+
+mozilla::ipc::IPCResult DocAccessibleChild::RecvScrollSubstringToPoint(
+ const uint64_t& aID, const int32_t& aStartOffset, const int32_t& aEndOffset,
+ const uint32_t& aCoordinateType, const int32_t& aX, const int32_t& aY) {
+ HyperTextAccessible* acc = IdToHyperTextAccessible(aID);
+ if (acc) {
+ acc->ScrollSubstringToPoint(aStartOffset, aEndOffset, aCoordinateType, aX,
+ aY);
+ }
+
+ return IPC_OK();
+}
+
+LocalAccessible* DocAccessibleChild::IdToAccessible(const uint64_t& aID) const {
+ if (!aID) return mDoc;
+
+ if (!mDoc) return nullptr;
+
+ return mDoc->GetAccessibleByUniqueID(reinterpret_cast<void*>(aID));
+}
+
+HyperTextAccessible* DocAccessibleChild::IdToHyperTextAccessible(
+ const uint64_t& aID) const {
+ LocalAccessible* acc = IdToAccessible(aID);
+ return acc && acc->IsHyperText() ? acc->AsHyperText() : nullptr;
+}
+
+} // namespace a11y
+} // namespace mozilla