1 files changed, 226 insertions, 0 deletions
diff --git a/accessible/generic/OuterDocAccessible.cpp b/accessible/generic/OuterDocAccessible.cpp
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+++ b/accessible/generic/OuterDocAccessible.cpp
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+/* -*- 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 "OuterDocAccessible.h"
+
+#include "LocalAccessible-inl.h"
+#include "nsAccUtils.h"
+#include "DocAccessible-inl.h"
+#include "mozilla/a11y/DocAccessibleChild.h"
+#include "mozilla/a11y/DocAccessibleParent.h"
+#include "mozilla/dom/BrowserBridgeChild.h"
+#include "mozilla/dom/BrowserParent.h"
+#include "Role.h"
+#include "States.h"
+
+#ifdef A11Y_LOG
+#  include "Logging.h"
+#endif
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// OuterDocAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+OuterDocAccessible::OuterDocAccessible(nsIContent* aContent,
+                                       DocAccessible* aDoc)
+    : AccessibleWrap(aContent, aDoc) {
+  mType = eOuterDocType;
+
+  if (IPCAccessibilityActive()) {
+    auto bridge = dom::BrowserBridgeChild::GetFrom(aContent);
+    if (bridge) {
+      // This is an iframe which will be rendered in another process.
+      SendEmbedderAccessible(bridge);
+    }
+  }
+
+  // Request document accessible for the content document to make sure it's
+  // created. It will appended to outerdoc accessible children asynchronously.
+  dom::Document* outerDoc = mContent->GetUncomposedDoc();
+  if (outerDoc) {
+    dom::Document* innerDoc = outerDoc->GetSubDocumentFor(mContent);
+    if (innerDoc) GetAccService()->GetDocAccessible(innerDoc);
+  }
+}
+
+OuterDocAccessible::~OuterDocAccessible() {}
+
+void OuterDocAccessible::SendEmbedderAccessible(
+    dom::BrowserBridgeChild* aBridge) {
+  MOZ_ASSERT(mDoc);
+  DocAccessibleChild* ipcDoc = mDoc->IPCDoc();
+  if (ipcDoc) {
+    uint64_t id = reinterpret_cast<uintptr_t>(UniqueID());
+    aBridge->SetEmbedderAccessible(ipcDoc, id);
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// LocalAccessible public (DON'T add methods here)
+
+role OuterDocAccessible::NativeRole() const { return roles::INTERNAL_FRAME; }
+
+LocalAccessible* OuterDocAccessible::LocalChildAtPoint(
+    int32_t aX, int32_t aY, EWhichChildAtPoint aWhichChild) {
+  LayoutDeviceIntRect docRect = Bounds();
+  if (!docRect.Contains(aX, aY)) return nullptr;
+
+  // Always return the inner doc as direct child accessible unless bounds
+  // outside of it.
+  LocalAccessible* child = LocalChildAt(0);
+  NS_ENSURE_TRUE(child, nullptr);
+
+  if (aWhichChild == Accessible::EWhichChildAtPoint::DeepestChild) {
+    return child->LocalChildAtPoint(
+        aX, aY, Accessible::EWhichChildAtPoint::DeepestChild);
+  }
+  return child;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// LocalAccessible public
+
+void OuterDocAccessible::Shutdown() {
+#ifdef A11Y_LOG
+  if (logging::IsEnabled(logging::eDocDestroy)) logging::OuterDocDestroy(this);
+#endif
+
+  if (auto* bridge = dom::BrowserBridgeChild::GetFrom(mContent)) {
+    uint64_t id = reinterpret_cast<uintptr_t>(UniqueID());
+    if (bridge->GetEmbedderAccessibleID() == id) {
+      // We were the last embedder accessible sent via PBrowserBridge; i.e. a
+      // new embedder accessible hasn't been created yet for this iframe. Clear
+      // the embedder accessible on PBrowserBridge.
+      bridge->SetEmbedderAccessible(nullptr, 0);
+    }
+  }
+
+  LocalAccessible* child = mChildren.SafeElementAt(0, nullptr);
+  if (child) {
+#ifdef A11Y_LOG
+    if (logging::IsEnabled(logging::eDocDestroy)) {
+      logging::DocDestroy("outerdoc's child document rebind is scheduled",
+                          child->AsDoc()->DocumentNode());
+    }
+#endif
+    RemoveChild(child);
+
+    // XXX: sometimes outerdoc accessible is shutdown because of layout style
+    // change however the presshell of underlying document isn't destroyed and
+    // the document doesn't get pagehide events. Schedule a document rebind
+    // to its parent document. Otherwise a document accessible may be lost if
+    // its outerdoc has being recreated (see bug 862863 for details).
+    if (!mDoc->IsDefunct()) {
+      MOZ_ASSERT(!child->IsDefunct(),
+                 "Attempt to reattach shutdown document accessible");
+      if (!child->IsDefunct()) {
+        mDoc->BindChildDocument(child->AsDoc());
+      }
+    }
+  }
+
+  AccessibleWrap::Shutdown();
+}
+
+bool OuterDocAccessible::InsertChildAt(uint32_t aIdx,
+                                       LocalAccessible* aAccessible) {
+  MOZ_RELEASE_ASSERT(aAccessible->IsDoc(),
+                     "OuterDocAccessible can have a document child only!");
+
+  // We keep showing the old document for a bit after creating the new one,
+  // and while building the new DOM and frame tree. That's done on purpose
+  // to avoid weird flashes of default background color.
+  // The old viewer will be destroyed after the new one is created.
+  // For a11y, it should be safe to shut down the old document now.
+  if (mChildren.Length()) mChildren[0]->Shutdown();
+
+  if (!AccessibleWrap::InsertChildAt(0, aAccessible)) return false;
+
+#ifdef A11Y_LOG
+  if (logging::IsEnabled(logging::eDocCreate)) {
+    logging::DocCreate("append document to outerdoc",
+                       aAccessible->AsDoc()->DocumentNode());
+    logging::Address("outerdoc", this);
+  }
+#endif
+
+  return true;
+}
+
+bool OuterDocAccessible::RemoveChild(LocalAccessible* aAccessible) {
+  LocalAccessible* child = mChildren.SafeElementAt(0, nullptr);
+  MOZ_ASSERT(child == aAccessible, "Wrong child to remove!");
+  if (child != aAccessible) {
+    return false;
+  }
+
+#ifdef A11Y_LOG
+  if (logging::IsEnabled(logging::eDocDestroy)) {
+    logging::DocDestroy("remove document from outerdoc",
+                        child->AsDoc()->DocumentNode(), child->AsDoc());
+    logging::Address("outerdoc", this);
+  }
+#endif
+
+  bool wasRemoved = AccessibleWrap::RemoveChild(child);
+
+  NS_ASSERTION(!mChildren.Length(),
+               "This child document of outerdoc accessible wasn't removed!");
+
+  return wasRemoved;
+}
+
+bool OuterDocAccessible::IsAcceptableChild(nsIContent* aEl) const {
+  // outer document accessible doesn't not participate in ordinal tree
+  // mutations.
+  return false;
+}
+
+// Accessible
+
+uint32_t OuterDocAccessible::ChildCount() const {
+  uint32_t result = mChildren.Length();
+  if (!result && RemoteChildDoc()) {
+    result = 1;
+  }
+  return result;
+}
+
+Accessible* OuterDocAccessible::ChildAt(uint32_t aIndex) const {
+  LocalAccessible* result = LocalChildAt(aIndex);
+  if (result || aIndex) {
+    return result;
+  }
+
+  return RemoteChildDoc();
+}
+
+Accessible* OuterDocAccessible::ChildAtPoint(int32_t aX, int32_t aY,
+                                             EWhichChildAtPoint aWhichChild) {
+  LayoutDeviceIntRect docRect = Bounds();
+  if (!docRect.Contains(aX, aY)) return nullptr;
+
+  // Always return the inner doc as direct child accessible unless bounds
+  // outside of it.
+  Accessible* child = ChildAt(0);
+  NS_ENSURE_TRUE(child, nullptr);
+
+  if (aWhichChild == EWhichChildAtPoint::DeepestChild) {
+    return child->ChildAtPoint(aX, aY, EWhichChildAtPoint::DeepestChild);
+  }
+  return child;
+}
+
+DocAccessibleParent* OuterDocAccessible::RemoteChildDoc() const {
+  dom::BrowserParent* tab = dom::BrowserParent::GetFrom(GetContent());
+  if (!tab) {
+    return nullptr;
+  }
+
+  return tab->GetTopLevelDocAccessible();
+}