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Diffstat (limited to 'accessible/ipc/DocAccessibleChild.cpp')
| -rw-r--r-- | accessible/ipc/DocAccessibleChild.cpp | 431 |
1 files changed, 431 insertions, 0 deletions
diff --git a/accessible/ipc/DocAccessibleChild.cpp b/accessible/ipc/DocAccessibleChild.cpp new file mode 100644 index 0000000000..5f9d1a0a63 --- /dev/null +++ b/accessible/ipc/DocAccessibleChild.cpp @@ -0,0 +1,431 @@ +/* -*- 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 |