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Diffstat (limited to '')
| -rw-r--r-- | accessible/ipc/DocAccessibleParent.cpp | 1266 |
1 files changed, 1266 insertions, 0 deletions
diff --git a/accessible/ipc/DocAccessibleParent.cpp b/accessible/ipc/DocAccessibleParent.cpp new file mode 100644 index 0000000000..1c96bd38cd --- /dev/null +++ b/accessible/ipc/DocAccessibleParent.cpp @@ -0,0 +1,1266 @@ +/* -*- 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 "DocAccessibleParent.h" +#include "mozilla/a11y/Platform.h" +#include "mozilla/Components.h" // for mozilla::components +#include "mozilla/dom/BrowserBridgeParent.h" +#include "mozilla/dom/BrowserParent.h" +#include "mozilla/dom/CanonicalBrowsingContext.h" +#include "nsAccessibilityService.h" +#include "xpcAccessibleDocument.h" +#include "xpcAccEvents.h" +#include "nsAccUtils.h" +#include "nsIIOService.h" +#include "TextRange.h" +#include "Relation.h" +#include "RootAccessible.h" + +#if defined(XP_WIN) +# include "Compatibility.h" +# include "nsWinUtils.h" +#endif + +#if defined(ANDROID) +# define ACQUIRE_ANDROID_LOCK \ + MonitorAutoLock mal(nsAccessibilityService::GetAndroidMonitor()); +#else +# define ACQUIRE_ANDROID_LOCK \ + do { \ + } while (0); +#endif + +namespace mozilla { + +namespace a11y { +uint64_t DocAccessibleParent::sMaxDocID = 0; + +DocAccessibleParent::DocAccessibleParent() + : RemoteAccessible(this), + mParentDoc(kNoParentDoc), +#if defined(XP_WIN) + mEmulatedWindowHandle(nullptr), +#endif // defined(XP_WIN) + mTopLevel(false), + mTopLevelInContentProcess(false), + mShutdown(false), + mFocus(0), + mCaretId(0), + mCaretOffset(-1), + mIsCaretAtEndOfLine(false) { + sMaxDocID++; + mActorID = sMaxDocID; + MOZ_ASSERT(!LiveDocs().Get(mActorID)); + LiveDocs().InsertOrUpdate(mActorID, this); +} + +DocAccessibleParent::~DocAccessibleParent() { + UnregisterWeakMemoryReporter(this); + LiveDocs().Remove(mActorID); + MOZ_ASSERT(mChildDocs.Length() == 0); + MOZ_ASSERT(!ParentDoc()); +} + +already_AddRefed<DocAccessibleParent> DocAccessibleParent::New() { + RefPtr<DocAccessibleParent> dap(new DocAccessibleParent()); + // We need to do this with a non-zero reference count. The easiest way is to + // do it in this static method and hide the constructor. + RegisterWeakMemoryReporter(dap); + return dap.forget(); +} + +void DocAccessibleParent::SetBrowsingContext( + dom::CanonicalBrowsingContext* aBrowsingContext) { + mBrowsingContext = aBrowsingContext; +} + +mozilla::ipc::IPCResult DocAccessibleParent::RecvShowEvent( + nsTArray<AccessibleData>&& aNewTree, const bool& aEventSuppressed, + const bool& aComplete, const bool& aFromUser) { + ACQUIRE_ANDROID_LOCK + if (mShutdown) return IPC_OK(); + + MOZ_ASSERT(CheckDocTree()); + + if (aNewTree.IsEmpty()) { + return IPC_FAIL(this, "No children being added"); + } + + RemoteAccessible* root = nullptr; + RemoteAccessible* rootParent = nullptr; + RemoteAccessible* lastParent = this; + uint64_t lastParentID = 0; + for (const auto& accData : aNewTree) { + RemoteAccessible* parent = accData.ParentID() == lastParentID + ? lastParent + : GetAccessible(accData.ParentID()); + // XXX This should really never happen, but sometimes we fail to fire the + // required show events. + if (!parent) { + NS_ERROR("adding child to unknown accessible"); +#ifdef DEBUG + return IPC_FAIL(this, "unknown parent accessible"); +#else + return IPC_OK(); +#endif + } + + uint32_t childIdx = accData.IndexInParent(); + if (childIdx > parent->ChildCount()) { + NS_ERROR("invalid index to add child at"); +#ifdef DEBUG + return IPC_FAIL(this, "invalid index"); +#else + return IPC_OK(); +#endif + } + + RemoteAccessible* child = CreateAcc(accData); + if (!child) { + // This shouldn't happen. + return IPC_FAIL(this, "failed to add children"); + } + if (!root && !mPendingShowChild) { + // This is the first Accessible, which is the root of the shown subtree. + root = child; + rootParent = parent; + } + // If this show event has been split across multiple messages and this is + // not the last message, don't attach the shown root to the tree yet. + // Otherwise, clients might crawl the incomplete subtree and they won't get + // mutation events for the remaining pieces. + if (aComplete || root != child) { + AttachChild(parent, childIdx, child); + } + } + + MOZ_ASSERT(CheckDocTree()); + + if (!aComplete && !mPendingShowChild) { + // This is the first message for a show event split across multiple + // messages. Save the show target for subsequent messages and return. + const auto& accData = aNewTree[0]; + mPendingShowChild = accData.ID(); + mPendingShowParent = accData.ParentID(); + mPendingShowIndex = accData.IndexInParent(); + return IPC_OK(); + } + if (!aComplete) { + // This show event has been split into multiple messages, but this is + // neither the first nor the last message. There's nothing more to do here. + return IPC_OK(); + } + MOZ_ASSERT(aComplete); + if (mPendingShowChild) { + // This is the last message for a show event split across multiple + // messages. Retrieve the saved show target, attach it to the tree and fire + // an event if appropriate. + rootParent = GetAccessible(mPendingShowParent); + MOZ_ASSERT(rootParent); + root = GetAccessible(mPendingShowChild); + MOZ_ASSERT(root); + AttachChild(rootParent, mPendingShowIndex, root); + mPendingShowChild = 0; + mPendingShowParent = 0; + mPendingShowIndex = 0; + } + + // Just update, no events. + if (aEventSuppressed) { + return IPC_OK(); + } + + PlatformShowHideEvent(root, rootParent, true, aFromUser); + + if (nsCOMPtr<nsIObserverService> obsService = + services::GetObserverService()) { + obsService->NotifyObservers(nullptr, NS_ACCESSIBLE_CACHE_TOPIC, nullptr); + } + + if (!nsCoreUtils::AccEventObserversExist()) { + return IPC_OK(); + } + + uint32_t type = nsIAccessibleEvent::EVENT_SHOW; + xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(root); + xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this); + nsINode* node = nullptr; + RefPtr<xpcAccEvent> event = + new xpcAccEvent(type, xpcAcc, doc, node, aFromUser); + nsCoreUtils::DispatchAccEvent(std::move(event)); + + return IPC_OK(); +} + +RemoteAccessible* DocAccessibleParent::CreateAcc( + const AccessibleData& aAccData) { + RemoteAccessible* newProxy; + if ((newProxy = GetAccessible(aAccData.ID()))) { + // This is a move. Reuse the Accessible; don't destroy it. + MOZ_ASSERT(!newProxy->RemoteParent()); + return newProxy; + } + + if (!aria::IsRoleMapIndexValid(aAccData.RoleMapEntryIndex())) { + MOZ_ASSERT_UNREACHABLE("Invalid role map entry index"); + return nullptr; + } + + newProxy = new RemoteAccessible(aAccData.ID(), this, aAccData.Role(), + aAccData.Type(), aAccData.GenericTypes(), + aAccData.RoleMapEntryIndex()); + mAccessibles.PutEntry(aAccData.ID())->mProxy = newProxy; + + if (RefPtr<AccAttributes> fields = aAccData.CacheFields()) { + newProxy->ApplyCache(CacheUpdateType::Initial, fields); + } + + return newProxy; +} + +void DocAccessibleParent::AttachChild(RemoteAccessible* aParent, + uint32_t aIndex, + RemoteAccessible* aChild) { + aParent->AddChildAt(aIndex, aChild); + aChild->SetParent(aParent); + // ProxyCreated might have already been called if aChild is being moved. + if (!aChild->GetWrapper()) { + ProxyCreated(aChild); + } + if (aChild->IsTableCell()) { + CachedTableAccessible::Invalidate(aChild); + } + if (aChild->IsOuterDoc()) { + // We can only do this after ProxyCreated is called because it will fire an + // event on aChild. + mPendingOOPChildDocs.RemoveIf([&](dom::BrowserBridgeParent* bridge) { + MOZ_ASSERT(bridge->GetBrowserParent(), + "Pending BrowserBridgeParent should be alive"); + if (bridge->GetEmbedderAccessibleId() != aChild->ID()) { + return false; + } + MOZ_ASSERT(bridge->GetEmbedderAccessibleDoc() == this); + if (DocAccessibleParent* childDoc = bridge->GetDocAccessibleParent()) { + AddChildDoc(childDoc, aChild->ID(), false); + } + return true; + }); + } +} + +void DocAccessibleParent::ShutdownOrPrepareForMove(RemoteAccessible* aAcc) { + // Children might be removed or moved. Handle them the same way. We do this + // before checking the moving IDs set in order to ensure that we handle moved + // descendants properly. Avoid descending into the children of outer documents + // for moves since they are added and removed differently to normal children. + if (!aAcc->IsOuterDoc()) { + // Even if some children are kept, those will be re-attached when we handle + // the show event. For now, clear all of them by moving them to a temporary. + auto children{std::move(aAcc->mChildren)}; + for (RemoteAccessible* child : children) { + ShutdownOrPrepareForMove(child); + } + } + + const uint64_t id = aAcc->ID(); + if (!mMovingIDs.Contains(id)) { + // This Accessible is being removed. + aAcc->Shutdown(); + return; + } + // This is a move. Moves are sent as a hide and then a show, but for a move, + // we want to keep the Accessible alive for reuse later. + if (aAcc->IsTable() || aAcc->IsTableCell()) { + // For table cells, it's important that we do this before the parent is + // cleared because CachedTableAccessible::Invalidate needs the ancestry. + CachedTableAccessible::Invalidate(aAcc); + } + if (aAcc->IsHyperText()) { + aAcc->InvalidateCachedHyperTextOffsets(); + } + aAcc->SetParent(nullptr); + mMovingIDs.EnsureRemoved(id); +} + +mozilla::ipc::IPCResult DocAccessibleParent::RecvHideEvent( + const uint64_t& aRootID, const bool& aFromUser) { + ACQUIRE_ANDROID_LOCK + if (mShutdown) return IPC_OK(); + + MOZ_ASSERT(CheckDocTree()); + + // We shouldn't actually need this because mAccessibles shouldn't have an + // entry for the document itself, but it doesn't hurt to be explicit. + if (!aRootID) { + return IPC_FAIL(this, "Trying to hide entire document?"); + } + + ProxyEntry* rootEntry = mAccessibles.GetEntry(aRootID); + if (!rootEntry) { + NS_ERROR("invalid root being removed!"); + return IPC_OK(); + } + + RemoteAccessible* root = rootEntry->mProxy; + if (!root) { + NS_ERROR("invalid root being removed!"); + return IPC_OK(); + } + + RemoteAccessible* parent = root->RemoteParent(); + PlatformShowHideEvent(root, parent, false, aFromUser); + + RefPtr<xpcAccHideEvent> event = nullptr; + if (nsCoreUtils::AccEventObserversExist()) { + uint32_t type = nsIAccessibleEvent::EVENT_HIDE; + xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(root); + xpcAccessibleGeneric* xpcParent = GetXPCAccessible(parent); + RemoteAccessible* next = root->RemoteNextSibling(); + xpcAccessibleGeneric* xpcNext = next ? GetXPCAccessible(next) : nullptr; + RemoteAccessible* prev = root->RemotePrevSibling(); + xpcAccessibleGeneric* xpcPrev = prev ? GetXPCAccessible(prev) : nullptr; + xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this); + nsINode* node = nullptr; + event = new xpcAccHideEvent(type, xpcAcc, doc, node, aFromUser, xpcParent, + xpcNext, xpcPrev); + } + + parent->RemoveChild(root); + ShutdownOrPrepareForMove(root); + + MOZ_ASSERT(CheckDocTree()); + + if (event) { + nsCoreUtils::DispatchAccEvent(std::move(event)); + } + + return IPC_OK(); +} + +mozilla::ipc::IPCResult DocAccessibleParent::RecvEvent( + const uint64_t& aID, const uint32_t& aEventType) { + ACQUIRE_ANDROID_LOCK + if (mShutdown) { + return IPC_OK(); + } + if (aEventType == 0 || aEventType >= nsIAccessibleEvent::EVENT_LAST_ENTRY) { + MOZ_ASSERT_UNREACHABLE("Invalid event"); + return IPC_FAIL(this, "Invalid event"); + } + + RemoteAccessible* remote = GetAccessible(aID); + if (!remote) { + NS_ERROR("no proxy for event!"); + return IPC_OK(); + } + + FireEvent(remote, aEventType); + return IPC_OK(); +} + +void DocAccessibleParent::FireEvent(RemoteAccessible* aAcc, + const uint32_t& aEventType) { + if (aEventType == nsIAccessibleEvent::EVENT_REORDER || + aEventType == nsIAccessibleEvent::EVENT_INNER_REORDER) { + uint32_t count = aAcc->ChildCount(); + for (uint32_t c = 0; c < count; ++c) { + aAcc->RemoteChildAt(c)->InvalidateGroupInfo(); + } + } else if (aEventType == nsIAccessibleEvent::EVENT_DOCUMENT_LOAD_COMPLETE && + aAcc == this) { + // A DocAccessible gets the STALE state while it is still loading, but we + // don't fire a state change for that. That state might have been + // included in the initial cache push, so clear it here. + // We also clear the BUSY state here. Although we do fire a state change + // for that, we fire it after doc load complete. It doesn't make sense + // for the document to report BUSY after doc load complete and doing so + // confuses JAWS. + UpdateStateCache(states::STALE | states::BUSY, false); + } + + PlatformEvent(aAcc, aEventType); + + if (!nsCoreUtils::AccEventObserversExist()) { + return; + } + + xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(aAcc); + xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this); + nsINode* node = nullptr; + bool fromUser = true; // XXX fix me + RefPtr<xpcAccEvent> event = + new xpcAccEvent(aEventType, xpcAcc, doc, node, fromUser); + nsCoreUtils::DispatchAccEvent(std::move(event)); +} + +mozilla::ipc::IPCResult DocAccessibleParent::RecvStateChangeEvent( + const uint64_t& aID, const uint64_t& aState, const bool& aEnabled) { + ACQUIRE_ANDROID_LOCK + if (mShutdown) { + return IPC_OK(); + } + + RemoteAccessible* target = GetAccessible(aID); + if (!target) { + NS_ERROR("we don't know about the target of a state change event!"); + return IPC_OK(); + } + + target->UpdateStateCache(aState, aEnabled); + if (nsCOMPtr<nsIObserverService> obsService = + services::GetObserverService()) { + obsService->NotifyObservers(nullptr, NS_ACCESSIBLE_CACHE_TOPIC, nullptr); + } + PlatformStateChangeEvent(target, aState, aEnabled); + + if (!nsCoreUtils::AccEventObserversExist()) { + return IPC_OK(); + } + + xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(target); + xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this); + uint32_t type = nsIAccessibleEvent::EVENT_STATE_CHANGE; + bool extra; + uint32_t state = nsAccUtils::To32States(aState, &extra); + bool fromUser = true; // XXX fix this + nsINode* node = nullptr; // XXX can we do better? + RefPtr<xpcAccStateChangeEvent> event = new xpcAccStateChangeEvent( + type, xpcAcc, doc, node, fromUser, state, extra, aEnabled); + nsCoreUtils::DispatchAccEvent(std::move(event)); + + return IPC_OK(); +} + +mozilla::ipc::IPCResult DocAccessibleParent::RecvCaretMoveEvent( + const uint64_t& aID, const LayoutDeviceIntRect& aCaretRect, + const int32_t& aOffset, const bool& aIsSelectionCollapsed, + const bool& aIsAtEndOfLine, const int32_t& aGranularity, + const bool& aFromUser) { + ACQUIRE_ANDROID_LOCK + if (mShutdown) { + return IPC_OK(); + } + + RemoteAccessible* proxy = GetAccessible(aID); + if (!proxy) { + NS_ERROR("unknown caret move event target!"); + return IPC_OK(); + } + + mCaretId = aID; + mCaretOffset = aOffset; + mIsCaretAtEndOfLine = aIsAtEndOfLine; + if (aIsSelectionCollapsed) { + // We don't fire selection events for collapsed selections, but we need to + // ensure we don't have a stale cached selection; e.g. when selecting + // forward and then unselecting backward. + mTextSelections.ClearAndRetainStorage(); + mTextSelections.AppendElement(TextRangeData(aID, aID, aOffset, aOffset)); + } + + PlatformCaretMoveEvent(proxy, aOffset, aIsSelectionCollapsed, aGranularity, + aCaretRect, aFromUser); + + if (!nsCoreUtils::AccEventObserversExist()) { + return IPC_OK(); + } + + xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(proxy); + xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this); + nsINode* node = nullptr; + bool fromUser = true; // XXX fix me + uint32_t type = nsIAccessibleEvent::EVENT_TEXT_CARET_MOVED; + RefPtr<xpcAccCaretMoveEvent> event = new xpcAccCaretMoveEvent( + type, xpcAcc, doc, node, fromUser, aOffset, aIsSelectionCollapsed, + aIsAtEndOfLine, aGranularity); + nsCoreUtils::DispatchAccEvent(std::move(event)); + + return IPC_OK(); +} + +mozilla::ipc::IPCResult DocAccessibleParent::RecvTextChangeEvent( + const uint64_t& aID, const nsAString& aStr, const int32_t& aStart, + const uint32_t& aLen, const bool& aIsInsert, const bool& aFromUser) { + ACQUIRE_ANDROID_LOCK + if (mShutdown) { + return IPC_OK(); + } + + RemoteAccessible* target = GetAccessible(aID); + if (!target) { + NS_ERROR("text change event target is unknown!"); + return IPC_OK(); + } + + PlatformTextChangeEvent(target, aStr, aStart, aLen, aIsInsert, aFromUser); + + if (!nsCoreUtils::AccEventObserversExist()) { + return IPC_OK(); + } + + xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(target); + xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this); + uint32_t type = aIsInsert ? nsIAccessibleEvent::EVENT_TEXT_INSERTED + : nsIAccessibleEvent::EVENT_TEXT_REMOVED; + nsINode* node = nullptr; + RefPtr<xpcAccTextChangeEvent> event = new xpcAccTextChangeEvent( + type, xpcAcc, doc, node, aFromUser, aStart, aLen, aIsInsert, aStr); + nsCoreUtils::DispatchAccEvent(std::move(event)); + + return IPC_OK(); +} + +mozilla::ipc::IPCResult DocAccessibleParent::RecvSelectionEvent( + const uint64_t& aID, const uint64_t& aWidgetID, const uint32_t& aType) { + ACQUIRE_ANDROID_LOCK + if (mShutdown) { + return IPC_OK(); + } + if (aType == 0 || aType >= nsIAccessibleEvent::EVENT_LAST_ENTRY) { + MOZ_ASSERT_UNREACHABLE("Invalid event"); + return IPC_FAIL(this, "Invalid event"); + } + + RemoteAccessible* target = GetAccessible(aID); + RemoteAccessible* widget = GetAccessible(aWidgetID); + if (!target || !widget) { + NS_ERROR("invalid id in selection event"); + return IPC_OK(); + } + + PlatformSelectionEvent(target, widget, aType); + if (!nsCoreUtils::AccEventObserversExist()) { + return IPC_OK(); + } + xpcAccessibleGeneric* xpcTarget = GetXPCAccessible(target); + xpcAccessibleDocument* xpcDoc = GetAccService()->GetXPCDocument(this); + RefPtr<xpcAccEvent> event = + new xpcAccEvent(aType, xpcTarget, xpcDoc, nullptr, false); + nsCoreUtils::DispatchAccEvent(std::move(event)); + + return IPC_OK(); +} + +mozilla::ipc::IPCResult DocAccessibleParent::RecvScrollingEvent( + const uint64_t& aID, const uint64_t& aType, const uint32_t& aScrollX, + const uint32_t& aScrollY, const uint32_t& aMaxScrollX, + const uint32_t& aMaxScrollY) { + ACQUIRE_ANDROID_LOCK + if (mShutdown) { + return IPC_OK(); + } + if (aType == 0 || aType >= nsIAccessibleEvent::EVENT_LAST_ENTRY) { + MOZ_ASSERT_UNREACHABLE("Invalid event"); + return IPC_FAIL(this, "Invalid event"); + } + + RemoteAccessible* target = GetAccessible(aID); + if (!target) { + NS_ERROR("no proxy for event!"); + return IPC_OK(); + } + +#if defined(ANDROID) + PlatformScrollingEvent(target, aType, aScrollX, aScrollY, aMaxScrollX, + aMaxScrollY); +#else + PlatformEvent(target, aType); +#endif + + if (!nsCoreUtils::AccEventObserversExist()) { + return IPC_OK(); + } + + xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(target); + xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this); + nsINode* node = nullptr; + bool fromUser = true; // XXX: Determine if this was from user input. + RefPtr<xpcAccScrollingEvent> event = + new xpcAccScrollingEvent(aType, xpcAcc, doc, node, fromUser, aScrollX, + aScrollY, aMaxScrollX, aMaxScrollY); + nsCoreUtils::DispatchAccEvent(std::move(event)); + + return IPC_OK(); +} + +mozilla::ipc::IPCResult DocAccessibleParent::RecvCache( + const mozilla::a11y::CacheUpdateType& aUpdateType, + nsTArray<CacheData>&& aData) { + ACQUIRE_ANDROID_LOCK + if (mShutdown) { + return IPC_OK(); + } + + for (auto& entry : aData) { + RemoteAccessible* remote = GetAccessible(entry.ID()); + if (!remote) { + MOZ_ASSERT_UNREACHABLE("No remote found!"); + continue; + } + + remote->ApplyCache(aUpdateType, entry.Fields()); + } + + if (nsCOMPtr<nsIObserverService> obsService = + services::GetObserverService()) { + obsService->NotifyObservers(nullptr, NS_ACCESSIBLE_CACHE_TOPIC, nullptr); + } + + return IPC_OK(); +} + +mozilla::ipc::IPCResult DocAccessibleParent::RecvSelectedAccessiblesChanged( + nsTArray<uint64_t>&& aSelectedIDs, nsTArray<uint64_t>&& aUnselectedIDs) { + ACQUIRE_ANDROID_LOCK + if (mShutdown) { + return IPC_OK(); + } + + for (auto& id : aSelectedIDs) { + RemoteAccessible* remote = GetAccessible(id); + if (!remote) { + MOZ_ASSERT_UNREACHABLE("No remote found!"); + continue; + } + + remote->UpdateStateCache(states::SELECTED, true); + } + + for (auto& id : aUnselectedIDs) { + RemoteAccessible* remote = GetAccessible(id); + if (!remote) { + MOZ_ASSERT_UNREACHABLE("No remote found!"); + continue; + } + + remote->UpdateStateCache(states::SELECTED, false); + } + + if (nsCOMPtr<nsIObserverService> obsService = + services::GetObserverService()) { + obsService->NotifyObservers(nullptr, NS_ACCESSIBLE_CACHE_TOPIC, nullptr); + } + + return IPC_OK(); +} + +mozilla::ipc::IPCResult DocAccessibleParent::RecvAccessiblesWillMove( + nsTArray<uint64_t>&& aIDs) { + for (uint64_t id : aIDs) { + mMovingIDs.EnsureInserted(id); + } + return IPC_OK(); +} + +#if !defined(XP_WIN) +mozilla::ipc::IPCResult DocAccessibleParent::RecvAnnouncementEvent( + const uint64_t& aID, const nsAString& aAnnouncement, + const uint16_t& aPriority) { + ACQUIRE_ANDROID_LOCK + if (mShutdown) { + return IPC_OK(); + } + + RemoteAccessible* target = GetAccessible(aID); + if (!target) { + NS_ERROR("no proxy for event!"); + return IPC_OK(); + } + +# if defined(ANDROID) + PlatformAnnouncementEvent(target, aAnnouncement, aPriority); +# endif + + if (!nsCoreUtils::AccEventObserversExist()) { + return IPC_OK(); + } + + xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(target); + xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this); + RefPtr<xpcAccAnnouncementEvent> event = new xpcAccAnnouncementEvent( + nsIAccessibleEvent::EVENT_ANNOUNCEMENT, xpcAcc, doc, nullptr, false, + aAnnouncement, aPriority); + nsCoreUtils::DispatchAccEvent(std::move(event)); + + return IPC_OK(); +} +#endif // !defined(XP_WIN) + +mozilla::ipc::IPCResult DocAccessibleParent::RecvTextSelectionChangeEvent( + const uint64_t& aID, nsTArray<TextRangeData>&& aSelection) { + ACQUIRE_ANDROID_LOCK + if (mShutdown) { + return IPC_OK(); + } + + RemoteAccessible* target = GetAccessible(aID); + if (!target) { + NS_ERROR("no proxy for event!"); + return IPC_OK(); + } + + mTextSelections.ClearAndRetainStorage(); + mTextSelections.AppendElements(aSelection); + +#ifdef MOZ_WIDGET_COCOA + AutoTArray<TextRange, 1> ranges; + SelectionRanges(&ranges); + PlatformTextSelectionChangeEvent(target, ranges); +#else + PlatformEvent(target, nsIAccessibleEvent::EVENT_TEXT_SELECTION_CHANGED); +#endif + + if (!nsCoreUtils::AccEventObserversExist()) { + return IPC_OK(); + } + xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(target); + xpcAccessibleDocument* doc = nsAccessibilityService::GetXPCDocument(this); + nsINode* node = nullptr; + bool fromUser = true; // XXX fix me + RefPtr<xpcAccEvent> event = + new xpcAccEvent(nsIAccessibleEvent::EVENT_TEXT_SELECTION_CHANGED, xpcAcc, + doc, node, fromUser); + nsCoreUtils::DispatchAccEvent(std::move(event)); + + return IPC_OK(); +} + +mozilla::ipc::IPCResult DocAccessibleParent::RecvRoleChangedEvent( + const a11y::role& aRole, const uint8_t& aRoleMapEntryIndex) { + ACQUIRE_ANDROID_LOCK + if (mShutdown) { + return IPC_OK(); + } + if (!aria::IsRoleMapIndexValid(aRoleMapEntryIndex)) { + MOZ_ASSERT_UNREACHABLE("Invalid role map entry index"); + return IPC_FAIL(this, "Invalid role map entry index"); + } + + mRole = aRole; + mRoleMapEntryIndex = aRoleMapEntryIndex; + +#ifdef MOZ_WIDGET_COCOA + PlatformRoleChangedEvent(this, aRole, aRoleMapEntryIndex); +#endif + + return IPC_OK(); +} + +mozilla::ipc::IPCResult DocAccessibleParent::RecvBindChildDoc( + NotNull<PDocAccessibleParent*> aChildDoc, const uint64_t& aID) { + ACQUIRE_ANDROID_LOCK + // One document should never directly be the child of another. + // We should always have at least an outer doc accessible in between. + MOZ_ASSERT(aID); + if (!aID) return IPC_FAIL(this, "ID is 0!"); + + if (mShutdown) { + return IPC_OK(); + } + + MOZ_ASSERT(CheckDocTree()); + + auto childDoc = static_cast<DocAccessibleParent*>(aChildDoc.get()); + childDoc->Unbind(); + ipc::IPCResult result = AddChildDoc(childDoc, aID, false); + MOZ_ASSERT(result); + MOZ_ASSERT(CheckDocTree()); +#ifdef DEBUG + if (!result) { + return result; + } +#else + result = IPC_OK(); +#endif + + return result; +} + +ipc::IPCResult DocAccessibleParent::AddChildDoc(DocAccessibleParent* aChildDoc, + uint64_t aParentID, + bool aCreating) { + // We do not use GetAccessible here because we want to be sure to not get the + // document it self. + ProxyEntry* e = mAccessibles.GetEntry(aParentID); + if (!e) { +#ifndef FUZZING_SNAPSHOT + // This diagnostic assert and the one down below expect a well-behaved + // child process. In IPC fuzzing, we directly fuzz parameters of each + // method over IPDL and the asserts are not valid under these conditions. + MOZ_DIAGNOSTIC_ASSERT(false, "Binding to nonexistent proxy!"); +#endif + return IPC_FAIL(this, "binding to nonexistant proxy!"); + } + + RemoteAccessible* outerDoc = e->mProxy; + MOZ_ASSERT(outerDoc); + + // OuterDocAccessibles are expected to only have a document as a child. + // However for compatibility we tolerate replacing one document with another + // here. + if (!outerDoc->IsOuterDoc() || outerDoc->ChildCount() > 1 || + (outerDoc->ChildCount() == 1 && !outerDoc->RemoteChildAt(0)->IsDoc())) { +#ifndef FUZZING_SNAPSHOT + MOZ_DIAGNOSTIC_ASSERT(false, + "Binding to parent that isn't a valid OuterDoc!"); +#endif + return IPC_FAIL(this, "Binding to parent that isn't a valid OuterDoc!"); + } + + if (outerDoc->ChildCount() == 1) { + MOZ_ASSERT(outerDoc->RemoteChildAt(0)->AsDoc()); + outerDoc->RemoteChildAt(0)->AsDoc()->Unbind(); + } + + aChildDoc->SetParent(outerDoc); + outerDoc->SetChildDoc(aChildDoc); + mChildDocs.AppendElement(aChildDoc->mActorID); + aChildDoc->mParentDoc = mActorID; + + if (aCreating) { + ProxyCreated(aChildDoc); + } + + if (aChildDoc->IsTopLevelInContentProcess()) { + // aChildDoc is an embedded document in a different content process to + // this document. + auto embeddedBrowser = + static_cast<dom::BrowserParent*>(aChildDoc->Manager()); + dom::BrowserBridgeParent* bridge = + embeddedBrowser->GetBrowserBridgeParent(); + if (bridge) { +#if defined(XP_WIN) + if (nsWinUtils::IsWindowEmulationStarted()) { + aChildDoc->SetEmulatedWindowHandle(mEmulatedWindowHandle); + } +#endif // defined(XP_WIN) + // We need to fire a reorder event on the outer doc accessible. + // For same-process documents, this is fired by the content process, but + // this isn't possible when the document is in a different process to its + // embedder. + // FireEvent fires both OS and XPCOM events. + FireEvent(outerDoc, nsIAccessibleEvent::EVENT_REORDER); + } + } + + return IPC_OK(); +} + +ipc::IPCResult DocAccessibleParent::AddChildDoc( + dom::BrowserBridgeParent* aBridge) { + MOZ_ASSERT(aBridge->GetEmbedderAccessibleDoc() == this); + uint64_t parentId = aBridge->GetEmbedderAccessibleId(); + MOZ_ASSERT(parentId); + if (!mAccessibles.GetEntry(parentId)) { + // Sometimes, this gets called before the embedder sends us the + // OuterDocAccessible. We must add the child when the OuterDocAccessible + // gets created later. + mPendingOOPChildDocs.Insert(aBridge); + return IPC_OK(); + } + return AddChildDoc(aBridge->GetDocAccessibleParent(), parentId, + /* aCreating */ false); +} + +mozilla::ipc::IPCResult DocAccessibleParent::RecvShutdown() { + ACQUIRE_ANDROID_LOCK + Destroy(); + + auto mgr = static_cast<dom::BrowserParent*>(Manager()); + if (!mgr->IsDestroyed()) { + if (!PDocAccessibleParent::Send__delete__(this)) { + return IPC_FAIL_NO_REASON(mgr); + } + } + + return IPC_OK(); +} + +void DocAccessibleParent::Destroy() { + // If we are already shutdown that is because our containing tab parent is + // shutting down in which case we don't need to do anything. + if (mShutdown) { + return; + } + + mShutdown = true; + mBrowsingContext = nullptr; + +#ifdef ANDROID + if (FocusMgr() && FocusMgr()->IsFocusedRemoteDoc(this)) { + FocusMgr()->SetFocusedRemoteDoc(nullptr); + } +#endif + + MOZ_DIAGNOSTIC_ASSERT(LiveDocs().Contains(mActorID)); + uint32_t childDocCount = mChildDocs.Length(); + for (uint32_t i = 0; i < childDocCount; i++) { + for (uint32_t j = i + 1; j < childDocCount; j++) { + MOZ_DIAGNOSTIC_ASSERT(mChildDocs[i] != mChildDocs[j]); + } + } + + // XXX This indirection through the hash map of live documents shouldn't be + // needed, but be paranoid for now. + int32_t actorID = mActorID; + for (uint32_t i = childDocCount - 1; i < childDocCount; i--) { + DocAccessibleParent* thisDoc = LiveDocs().Get(actorID); + MOZ_ASSERT(thisDoc); + if (!thisDoc) { + return; + } + + thisDoc->ChildDocAt(i)->Destroy(); + } + + for (auto iter = mAccessibles.Iter(); !iter.Done(); iter.Next()) { + RemoteAccessible* acc = iter.Get()->mProxy; + MOZ_ASSERT(acc != this); + if (acc->IsTable()) { + CachedTableAccessible::Invalidate(acc); + } + ProxyDestroyed(acc); + iter.Remove(); + } + + DocAccessibleParent* thisDoc = LiveDocs().Get(actorID); + MOZ_ASSERT(thisDoc); + if (!thisDoc) { + return; + } + + mChildren.Clear(); + // The code above should have already completely cleared these, but to be + // extra safe make sure they are cleared here. + thisDoc->mAccessibles.Clear(); + thisDoc->mChildDocs.Clear(); + + DocManager::NotifyOfRemoteDocShutdown(thisDoc); + thisDoc = LiveDocs().Get(actorID); + MOZ_ASSERT(thisDoc); + if (!thisDoc) { + return; + } + + ProxyDestroyed(thisDoc); + thisDoc = LiveDocs().Get(actorID); + MOZ_ASSERT(thisDoc); + if (!thisDoc) { + return; + } + + if (DocAccessibleParent* parentDoc = thisDoc->ParentDoc()) { + parentDoc->RemoveChildDoc(thisDoc); + } else if (IsTopLevel()) { + GetAccService()->RemoteDocShutdown(this); + } +} + +void DocAccessibleParent::ActorDestroy(ActorDestroyReason aWhy) { + MOZ_ASSERT(CheckDocTree()); + if (!mShutdown) { + ACQUIRE_ANDROID_LOCK + Destroy(); + } +} + +DocAccessibleParent* DocAccessibleParent::ParentDoc() const { + if (mParentDoc == kNoParentDoc) { + return nullptr; + } + + return LiveDocs().Get(mParentDoc); +} + +bool DocAccessibleParent::CheckDocTree() const { + size_t childDocs = mChildDocs.Length(); + for (size_t i = 0; i < childDocs; i++) { + const DocAccessibleParent* childDoc = ChildDocAt(i); + if (!childDoc || childDoc->ParentDoc() != this) return false; + + if (!childDoc->CheckDocTree()) { + return false; + } + } + + return true; +} + +xpcAccessibleGeneric* DocAccessibleParent::GetXPCAccessible( + RemoteAccessible* aProxy) { + xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this); + MOZ_ASSERT(doc); + + return doc->GetAccessible(aProxy); +} + +#if defined(XP_WIN) +void DocAccessibleParent::MaybeInitWindowEmulation() { + if (!nsWinUtils::IsWindowEmulationStarted()) { + return; + } + + // XXX get the bounds from the browserParent instead of poking at accessibles + // which might not exist yet. + LocalAccessible* outerDoc = OuterDocOfRemoteBrowser(); + if (!outerDoc) { + return; + } + + RootAccessible* rootDocument = outerDoc->RootAccessible(); + MOZ_ASSERT(rootDocument); + + bool isActive = true; + LayoutDeviceIntRect rect(CW_USEDEFAULT, CW_USEDEFAULT, 0, 0); + if (Compatibility::IsDolphin()) { + rect = Bounds(); + LayoutDeviceIntRect rootRect = rootDocument->Bounds(); + rect.MoveToX(rootRect.X() - rect.X()); + rect.MoveToY(rect.Y() - rootRect.Y()); + + auto browserParent = static_cast<dom::BrowserParent*>(Manager()); + isActive = browserParent->GetDocShellIsActive(); + } + + // onCreate is guaranteed to be called synchronously by + // nsWinUtils::CreateNativeWindow, so this reference isn't really necessary. + // However, static analysis complains without it. + RefPtr<DocAccessibleParent> thisRef = this; + nsWinUtils::NativeWindowCreateProc onCreate([thisRef](HWND aHwnd) -> void { + ::SetPropW(aHwnd, kPropNameDocAccParent, + reinterpret_cast<HANDLE>(thisRef.get())); + thisRef->SetEmulatedWindowHandle(aHwnd); + }); + + HWND parentWnd = reinterpret_cast<HWND>(rootDocument->GetNativeWindow()); + DebugOnly<HWND> hWnd = nsWinUtils::CreateNativeWindow( + kClassNameTabContent, parentWnd, rect.X(), rect.Y(), rect.Width(), + rect.Height(), isActive, &onCreate); + MOZ_ASSERT(hWnd); +} + +void DocAccessibleParent::SetEmulatedWindowHandle(HWND aWindowHandle) { + if (!aWindowHandle && mEmulatedWindowHandle && IsTopLevel()) { + ::DestroyWindow(mEmulatedWindowHandle); + } + mEmulatedWindowHandle = aWindowHandle; +} +#endif // defined(XP_WIN) + +mozilla::ipc::IPCResult DocAccessibleParent::RecvFocusEvent( + const uint64_t& aID, const LayoutDeviceIntRect& aCaretRect) { + ACQUIRE_ANDROID_LOCK + if (mShutdown) { + return IPC_OK(); + } + + RemoteAccessible* proxy = GetAccessible(aID); + if (!proxy) { + NS_ERROR("no proxy for event!"); + return IPC_OK(); + } + +#ifdef ANDROID + if (FocusMgr()) { + FocusMgr()->SetFocusedRemoteDoc(this); + } +#endif + + mFocus = aID; + PlatformFocusEvent(proxy, aCaretRect); + + if (!nsCoreUtils::AccEventObserversExist()) { + return IPC_OK(); + } + + xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(proxy); + xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this); + nsINode* node = nullptr; + bool fromUser = true; // XXX fix me + RefPtr<xpcAccEvent> event = new xpcAccEvent(nsIAccessibleEvent::EVENT_FOCUS, + xpcAcc, doc, node, fromUser); + nsCoreUtils::DispatchAccEvent(std::move(event)); + + return IPC_OK(); +} + +void DocAccessibleParent::SelectionRanges(nsTArray<TextRange>* aRanges) const { + aRanges->SetCapacity(mTextSelections.Length()); + for (const auto& data : mTextSelections) { + // Selection ranges should usually be in sync with the tree. However, tree + // and selection updates happen using separate IPDL calls, so it's possible + // for a client selection query to arrive between them. Thus, we validate + // the Accessibles and offsets here. + auto* startAcc = + const_cast<RemoteAccessible*>(GetAccessible(data.StartID())); + auto* endAcc = const_cast<RemoteAccessible*>(GetAccessible(data.EndID())); + if (!startAcc || !endAcc) { + continue; + } + uint32_t startCount = startAcc->CharacterCount(); + if (startCount == 0 || + data.StartOffset() > static_cast<int32_t>(startCount)) { + continue; + } + uint32_t endCount = endAcc->CharacterCount(); + if (endCount == 0 || data.EndOffset() > static_cast<int32_t>(endCount)) { + continue; + } + aRanges->AppendElement(TextRange(const_cast<DocAccessibleParent*>(this), + startAcc, data.StartOffset(), endAcc, + data.EndOffset())); + } +} + +Accessible* DocAccessibleParent::FocusedChild() { + LocalAccessible* outerDoc = OuterDocOfRemoteBrowser(); + if (!outerDoc) { + return nullptr; + } + + RootAccessible* rootDocument = outerDoc->RootAccessible(); + return rootDocument->FocusedChild(); +} + +void DocAccessibleParent::URL(nsACString& aURL) const { + if (!mBrowsingContext) { + return; + } + nsCOMPtr<nsIURI> uri = mBrowsingContext->GetCurrentURI(); + if (!uri) { + return; + } + // Let's avoid treating too long URI in the main process for avoiding + // memory fragmentation as far as possible. + if (uri->SchemeIs("data") || uri->SchemeIs("blob")) { + return; + } + nsCOMPtr<nsIIOService> io = mozilla::components::IO::Service(); + if (NS_WARN_IF(!io)) { + return; + } + nsCOMPtr<nsIURI> exposableURI; + if (NS_FAILED(io->CreateExposableURI(uri, getter_AddRefs(exposableURI))) || + MOZ_UNLIKELY(!exposableURI)) { + return; + } + exposableURI->GetSpec(aURL); +} + +void DocAccessibleParent::URL(nsAString& aURL) const { + nsAutoCString url; + URL(url); + CopyUTF8toUTF16(url, aURL); +} + +void DocAccessibleParent::MimeType(nsAString& aMime) const { + if (mCachedFields) { + mCachedFields->GetAttribute(CacheKey::MimeType, aMime); + } +} + +Relation DocAccessibleParent::RelationByType(RelationType aType) const { + // If the accessible is top-level, provide the NODE_CHILD_OF relation so that + // MSAA clients can easily get to true parent instead of getting to oleacc's + // ROLE_WINDOW accessible when window emulation is enabled which will prevent + // us from going up further (because it is system generated and has no idea + // about the hierarchy above it). + if (aType == RelationType::NODE_CHILD_OF && IsTopLevel()) { + return Relation(Parent()); + } + + return RemoteAccessible::RelationByType(aType); +} + +DocAccessibleParent* DocAccessibleParent::GetFrom( + dom::BrowsingContext* aBrowsingContext) { + if (!aBrowsingContext) { + return nullptr; + } + + dom::BrowserParent* bp = aBrowsingContext->Canonical()->GetBrowserParent(); + if (!bp) { + return nullptr; + } + + const ManagedContainer<PDocAccessibleParent>& docs = + bp->ManagedPDocAccessibleParent(); + for (auto* key : docs) { + // Iterate over our docs until we find one with a browsing + // context that matches the one we passed in. Return that + // document. + auto* doc = static_cast<a11y::DocAccessibleParent*>(key); + if (doc->GetBrowsingContext() == aBrowsingContext) { + return doc; + } + } + + return nullptr; +} + +size_t DocAccessibleParent::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) { + size_t size = 0; + + size += RemoteAccessible::SizeOfExcludingThis(aMallocSizeOf); + + size += mReverseRelations.ShallowSizeOfExcludingThis(aMallocSizeOf); + for (auto i = mReverseRelations.Iter(); !i.Done(); i.Next()) { + size += i.Data().ShallowSizeOfExcludingThis(aMallocSizeOf); + for (auto j = i.Data().Iter(); !j.Done(); j.Next()) { + size += j.Data().ShallowSizeOfExcludingThis(aMallocSizeOf); + } + } + + size += mOnScreenAccessibles.ShallowSizeOfExcludingThis(aMallocSizeOf); + + size += mChildDocs.ShallowSizeOfExcludingThis(aMallocSizeOf); + + size += mAccessibles.ShallowSizeOfExcludingThis(aMallocSizeOf); + for (auto i = mAccessibles.Iter(); !i.Done(); i.Next()) { + size += i.Get()->mProxy->SizeOfIncludingThis(aMallocSizeOf); + } + + size += mPendingOOPChildDocs.ShallowSizeOfExcludingThis(aMallocSizeOf); + + // The mTextSelections array contains structs of integers. We can count them + // by counting the size of the array - there's no deep structure here. + size += mTextSelections.ShallowSizeOfExcludingThis(aMallocSizeOf); + + return size; +} + +MOZ_DEFINE_MALLOC_SIZE_OF(MallocSizeOfAccessibilityCache); + +NS_IMETHODIMP +DocAccessibleParent::CollectReports(nsIHandleReportCallback* aHandleReport, + nsISupports* aData, bool aAnon) { + nsAutoCString path; + + if (aAnon) { + path = nsPrintfCString("explicit/a11y/cache(%" PRIu64 ")", mActorID); + } else { + nsCString url; + URL(url); + url.ReplaceChar( + '/', '\\'); // Tell the memory reporter this is not a path seperator. + path = nsPrintfCString("explicit/a11y/cache(%s)", url.get()); + } + + aHandleReport->Callback( + /* process */ ""_ns, path, KIND_HEAP, UNITS_BYTES, + SizeOfIncludingThis(MallocSizeOfAccessibilityCache), + nsLiteralCString("Size of the accessability cache for this document."), + aData); + + return NS_OK; +} + +NS_IMPL_ISUPPORTS(DocAccessibleParent, nsIMemoryReporter); + +} // namespace a11y +} // namespace mozilla |