1 files changed, 99 insertions, 0 deletions
diff --git a/accessible/base/EventTree.cpp b/accessible/base/EventTree.cpp
new file mode 100644
index 0000000000..29cf66e493
--- /dev/null
+++ b/accessible/base/EventTree.cpp
@@ -0,0 +1,99 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "EventTree.h"
+
+#include "EmbeddedObjCollector.h"
+#include "NotificationController.h"
+#ifdef A11Y_LOG
+#  include "Logging.h"
+#endif
+
+#include "mozilla/UniquePtr.h"
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// TreeMutation class
+
+TreeMutation::TreeMutation(LocalAccessible* aParent, bool aNoEvents)
+    : mParent(aParent),
+      mStartIdx(UINT32_MAX),
+      mStateFlagsCopy(mParent->mStateFlags),
+      mQueueEvents(!aNoEvents) {
+#ifdef DEBUG
+  mIsDone = false;
+#endif
+
+  mParent->mStateFlags |= LocalAccessible::eKidsMutating;
+}
+
+TreeMutation::~TreeMutation() {
+  MOZ_ASSERT(mIsDone, "Done() must be called explicitly");
+}
+
+void TreeMutation::AfterInsertion(LocalAccessible* aChild) {
+  MOZ_ASSERT(aChild->LocalParent() == mParent);
+
+  if (static_cast<uint32_t>(aChild->mIndexInParent) < mStartIdx) {
+    mStartIdx = aChild->mIndexInParent + 1;
+  }
+
+  if (!mQueueEvents) {
+    return;
+  }
+
+  RefPtr<AccShowEvent> ev = new AccShowEvent(aChild);
+  DebugOnly<bool> added = Controller()->QueueMutationEvent(ev);
+  MOZ_ASSERT(added);
+  aChild->SetShowEventTarget(true);
+}
+
+void TreeMutation::BeforeRemoval(LocalAccessible* aChild, bool aNoShutdown) {
+  MOZ_ASSERT(aChild->LocalParent() == mParent);
+
+  if (static_cast<uint32_t>(aChild->mIndexInParent) < mStartIdx) {
+    mStartIdx = aChild->mIndexInParent;
+  }
+
+  if (!mQueueEvents) {
+    return;
+  }
+
+  RefPtr<AccHideEvent> ev = new AccHideEvent(aChild, !aNoShutdown);
+  if (Controller()->QueueMutationEvent(ev)) {
+    aChild->SetHideEventTarget(true);
+  }
+}
+
+void TreeMutation::Done() {
+  MOZ_ASSERT(mParent->mStateFlags & LocalAccessible::eKidsMutating);
+  mParent->mStateFlags &= ~LocalAccessible::eKidsMutating;
+
+  uint32_t length = mParent->mChildren.Length();
+#ifdef DEBUG
+  for (uint32_t idx = 0; idx < mStartIdx && idx < length; idx++) {
+    MOZ_ASSERT(
+        mParent->mChildren[idx]->mIndexInParent == static_cast<int32_t>(idx),
+        "Wrong index detected");
+  }
+#endif
+
+  for (uint32_t idx = mStartIdx; idx < length; idx++) {
+    mParent->mChildren[idx]->mIndexOfEmbeddedChild = -1;
+  }
+
+  for (uint32_t idx = 0; idx < length; idx++) {
+    mParent->mChildren[idx]->mStateFlags |= LocalAccessible::eGroupInfoDirty;
+  }
+
+  mParent->mEmbeddedObjCollector = nullptr;
+  mParent->mStateFlags |= mStateFlagsCopy & LocalAccessible::eKidsMutating;
+
+#ifdef DEBUG
+  mIsDone = true;
+#endif
+}