1 files changed, 181 insertions, 0 deletions
diff --git a/accessible/ipc/DocAccessibleParent.cpp b/accessible/ipc/DocAccessibleParent.cpp
new file mode 100644
index 000000000..38b41357e
--- /dev/null
+++ b/accessible/ipc/DocAccessibleParent.cpp
@@ -0,0 +1,181 @@
+/* -*- 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 "DocAccessibleParent.h"
+#include "nsAutoPtr.h"
+#include "mozilla/a11y/Platform.h"
+#include "ProxyAccessible.h"
+
+namespace mozilla {
+namespace a11y {
+
+bool
+DocAccessibleParent::RecvShowEvent(const ShowEventData& aData)
+{
+  if (mShutdown)
+    return true;
+
+  if (aData.NewTree().IsEmpty()) {
+    NS_ERROR("no children being added");
+    return false;
+  }
+
+  ProxyAccessible* parent = nullptr;
+  if (aData.ID()) {
+    ProxyEntry* e = mAccessibles.GetEntry(aData.ID());
+    if (e)
+      parent = e->mProxy;
+  } else {
+    parent = this;
+  }
+
+  // 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");
+    return false;
+  }
+
+  uint32_t newChildIdx = aData.Idx();
+  if (newChildIdx > parent->ChildrenCount()) {
+    NS_ERROR("invalid index to add child at");
+    return false;
+  }
+
+  uint32_t consumed = AddSubtree(parent, aData.NewTree(), 0, newChildIdx);
+  MOZ_ASSERT(consumed == aData.NewTree().Length());
+#ifdef DEBUG
+  for (uint32_t i = 0; i < consumed; i++) {
+    uint64_t id = aData.NewTree()[i].ID();
+    MOZ_ASSERT(mAccessibles.GetEntry(id));
+  }
+#endif
+
+  return consumed != 0;
+}
+
+uint32_t
+DocAccessibleParent::AddSubtree(ProxyAccessible* aParent,
+                                const nsTArray<a11y::AccessibleData>& aNewTree,
+                                uint32_t aIdx, uint32_t aIdxInParent)
+{
+  if (aNewTree.Length() <= aIdx) {
+    NS_ERROR("bad index in serialized tree!");
+    return 0;
+  }
+
+  const AccessibleData& newChild = aNewTree[aIdx];
+  if (newChild.Role() > roles::LAST_ROLE) {
+    NS_ERROR("invalid role");
+    return 0;
+  }
+
+  auto role = static_cast<a11y::role>(newChild.Role());
+  ProxyAccessible* newProxy =
+    new ProxyAccessible(newChild.ID(), aParent, this, role);
+  aParent->AddChildAt(aIdxInParent, newProxy);
+  mAccessibles.PutEntry(newChild.ID())->mProxy = newProxy;
+  ProxyCreated(newProxy, newChild.Interfaces());
+
+  uint32_t accessibles = 1;
+  uint32_t kids = newChild.ChildrenCount();
+  for (uint32_t i = 0; i < kids; i++) {
+    uint32_t consumed = AddSubtree(newProxy, aNewTree, aIdx + accessibles, i);
+    if (!consumed)
+      return 0;
+
+    accessibles += consumed;
+  }
+
+  MOZ_ASSERT(newProxy->ChildrenCount() == kids);
+
+  return accessibles;
+}
+
+bool
+DocAccessibleParent::RecvHideEvent(const uint64_t& aRootID)
+{
+  if (mShutdown)
+    return true;
+
+  ProxyEntry* rootEntry = mAccessibles.GetEntry(aRootID);
+  if (!rootEntry) {
+    NS_ERROR("invalid root being removed!");
+    return true;
+  }
+
+  ProxyAccessible* root = rootEntry->mProxy;
+  if (!root) {
+    NS_ERROR("invalid root being removed!");
+    return true;
+  }
+
+  ProxyAccessible* parent = root->Parent();
+  parent->RemoveChild(root);
+  root->Shutdown();
+
+  return true;
+}
+
+bool
+DocAccessibleParent::RecvEvent(const uint64_t& aID, const uint32_t& aEventType)
+{
+  if (!aID) {
+    ProxyEvent(this, aEventType);
+    return true;
+  }
+
+  ProxyEntry* e = mAccessibles.GetEntry(aID);
+  if (!e) {
+    NS_ERROR("no proxy for event!");
+    return true;
+  }
+
+  ProxyEvent(e->mProxy, aEventType);
+  return true;
+}
+bool
+DocAccessibleParent::AddChildDoc(DocAccessibleParent* aChildDoc,
+                                 uint64_t aParentID)
+{
+  ProxyAccessible* outerDoc = mAccessibles.GetEntry(aParentID)->mProxy;
+  if (!outerDoc)
+    return false;
+
+  aChildDoc->mParent = outerDoc;
+  outerDoc->SetChildDoc(aChildDoc);
+  mChildDocs.AppendElement(aChildDoc);
+  aChildDoc->mParentDoc = this;
+  ProxyCreated(aChildDoc, 0);
+  return true;
+}
+
+PLDHashOperator
+DocAccessibleParent::ShutdownAccessibles(ProxyEntry* entry, void*)
+{
+  ProxyDestroyed(entry->mProxy);
+  return PL_DHASH_REMOVE;
+}
+
+void
+DocAccessibleParent::Destroy()
+{
+  NS_ASSERTION(mChildDocs.IsEmpty(),
+               "why weren't the child docs destroyed already?");
+  MOZ_ASSERT(!mShutdown);
+  mShutdown = true;
+
+  uint32_t childDocCount = mChildDocs.Length();
+  for (uint32_t i = childDocCount - 1; i < childDocCount; i--)
+    mChildDocs[i]->Destroy();
+
+  mAccessibles.EnumerateEntries(ShutdownAccessibles, nullptr);
+  ProxyDestroyed(this);
+  mParentDoc ? mParentDoc->RemoveChildDoc(this)
+    : GetAccService()->RemoteDocShutdown(this);
+}
+}
+}