예제 #1
0
EventTree*
EventTree::FindOrInsert(Accessible* aContainer)
{
  if (!mFirst) {
    mFirst.reset(new EventTree(aContainer, true));
    return mFirst.get();
  }

  EventTree* prevNode = nullptr;
  EventTree* node = mFirst.get();
  do {
    MOZ_ASSERT(!node->mContainer->IsApplication(),
               "No event for application accessible is expected here");
    MOZ_ASSERT(!node->mContainer->IsDefunct(), "An event target has to be alive");

    // Case of same target.
    if (node->mContainer == aContainer) {
      return node;
    }

    // Check if the given container is contained by a current node
    Accessible* top = mContainer ? mContainer : aContainer->Document();
    Accessible* parent = aContainer;
    while (parent) {
      // Reached a top, no match for a current event.
      if (parent == top) {
        break;
      }

      // We got a match.
      if (parent->Parent() == node->mContainer) {
        return node->FindOrInsert(aContainer);
      }

      parent = parent->Parent();
      MOZ_ASSERT(parent, "Wrong tree");
    }

    // If the given container contains a current node
    // then
    //   if show or hide of the given node contains a grand parent of the current node
    //   then ignore the current node and its show and hide events
    //   otherwise ignore the current node, but not its show and hide events
    Accessible* curParent = node->mContainer;
    while (curParent && !curParent->IsDoc()) {
      if (curParent->Parent() != aContainer) {
        curParent = curParent->Parent();
        continue;
      }

      // Insert the tail node into the hierarchy between the current node and
      // its parent.
      node->mFireReorder = false;
      UniquePtr<EventTree>& nodeOwnerRef = prevNode ? prevNode->mNext : mFirst;
      UniquePtr<EventTree> newNode(new EventTree(aContainer, mDependentEvents.IsEmpty()));
      newNode->mFirst = Move(nodeOwnerRef);
      nodeOwnerRef = Move(newNode);
      nodeOwnerRef->mNext = Move(node->mNext);

      // Check if a next node is contained by the given node too, and move them
      // under the given node if so.
      prevNode = nodeOwnerRef.get();
      node = nodeOwnerRef->mNext.get();
      UniquePtr<EventTree>* nodeRef = &nodeOwnerRef->mNext;
      EventTree* insNode = nodeOwnerRef->mFirst.get();
      while (node) {
        Accessible* curParent = node->mContainer;
        while (curParent && !curParent->IsDoc()) {
          if (curParent->Parent() != aContainer) {
            curParent = curParent->Parent();
            continue;
          }

          MOZ_ASSERT(!insNode->mNext);

          node->mFireReorder = false;
          insNode->mNext = Move(*nodeRef);
          insNode = insNode->mNext.get();

          prevNode->mNext = Move(node->mNext);
          node = prevNode;
          break;
        }

        prevNode = node;
        nodeRef = &node->mNext;
        node = node->mNext.get();
      }

      return nodeOwnerRef.get();
    }

    prevNode = node;
  } while ((node = node->mNext.get()));

  MOZ_ASSERT(prevNode, "Nowhere to insert");
  MOZ_ASSERT(!prevNode->mNext, "Taken by another node");

  // If 'this' node contains the given container accessible, then
  //   do not emit a reorder event for the container
  //   if a dependent show event target contains the given container then do not
  //   emit show / hide events (see Process() method)

  prevNode->mNext.reset(new EventTree(aContainer, mDependentEvents.IsEmpty()));
  return prevNode->mNext.get();
}
예제 #2
0
EventTree*
EventTree::FindOrInsert(Accessible* aContainer)
{
  if (!mFirst) {
    mFirst.reset(new EventTree(aContainer, mDependentEvents.IsEmpty()));
    return mFirst.get();
  }

  EventTree* prevNode = nullptr;
  EventTree* node = mFirst.get();
  do {
    MOZ_ASSERT(!node->mContainer->IsApplication(),
               "No event for application accessible is expected here");
    MOZ_ASSERT(!node->mContainer->IsDefunct(), "An event target has to be alive");

    // Case of same target.
    if (node->mContainer == aContainer) {
      return node;
    }

    // Check if the given container is contained by a current node
    Accessible* top = mContainer ? mContainer : aContainer->Document();
    Accessible* parent = aContainer;
    while (parent) {
      // Reached a top, no match for a current event.
      if (parent == top) {
        break;
      }

      // We got a match.
      if (parent->Parent() == node->mContainer) {
        // Reject the node if it's contained by a show/hide event target
        uint32_t evCount = node->mDependentEvents.Length();
        for (uint32_t idx = 0; idx < evCount; idx++) {
          AccMutationEvent* ev = node->mDependentEvents[idx];
          if (ev->GetAccessible() == parent) {
#ifdef A11Y_LOG
            if (logging::IsEnabled(logging::eEventTree)) {
              logging::MsgBegin("EVENTS_TREE",
                "Rejecting node contained by show/hide");
              logging::AccessibleInfo("Node", aContainer);
              logging::MsgEnd();
            }
#endif
            // If the node is rejected, then check if it has related hide event
            // on stack, and if so, then connect it to the parent show event.
            if (ev->IsShow()) {
              AccShowEvent* showEv = downcast_accEvent(ev);
              Controller(aContainer)->
                WithdrawPrecedingEvents(&showEv->mPrecedingEvents);
            }
            return nullptr;
          }
        }

        return node->FindOrInsert(aContainer);
      }

      parent = parent->Parent();
      MOZ_ASSERT(parent, "Wrong tree");
    }

    // If the given container contains a current node
    // then
    //   if show or hide of the given node contains a grand parent of the current node
    //   then ignore the current node and its show and hide events
    //   otherwise ignore the current node, but not its show and hide events
    Accessible* curParent = node->mContainer;
    while (curParent && !curParent->IsDoc()) {
      if (curParent->Parent() != aContainer) {
        curParent = curParent->Parent();
        continue;
      }

      // Insert the tail node into the hierarchy between the current node and
      // its parent.
      node->mFireReorder = false;
      UniquePtr<EventTree>& nodeOwnerRef = prevNode ? prevNode->mNext : mFirst;
      UniquePtr<EventTree> newNode(new EventTree(aContainer, mDependentEvents.IsEmpty()));
      newNode->mFirst = Move(nodeOwnerRef);
      nodeOwnerRef = Move(newNode);
      nodeOwnerRef->mNext = Move(node->mNext);

      // Check if a next node is contained by the given node too, and move them
      // under the given node if so.
      prevNode = nodeOwnerRef.get();
      node = nodeOwnerRef->mNext.get();
      UniquePtr<EventTree>* nodeRef = &nodeOwnerRef->mNext;
      EventTree* insNode = nodeOwnerRef->mFirst.get();
      while (node) {
        Accessible* curParent = node->mContainer;
        while (curParent && !curParent->IsDoc()) {
          if (curParent->Parent() != aContainer) {
            curParent = curParent->Parent();
            continue;
          }

          MOZ_ASSERT(!insNode->mNext);

          node->mFireReorder = false;
          insNode->mNext = Move(*nodeRef);
          insNode = insNode->mNext.get();

          prevNode->mNext = Move(node->mNext);
          node = prevNode;
          break;
        }

        prevNode = node;
        nodeRef = &node->mNext;
        node = node->mNext.get();
      }

      return nodeOwnerRef.get();
    }

    prevNode = node;
  } while ((node = node->mNext.get()));

  MOZ_ASSERT(prevNode, "Nowhere to insert");
  MOZ_ASSERT(!prevNode->mNext, "Taken by another node");

  // If 'this' node contains the given container accessible, then
  //   do not emit a reorder event for the container
  //   if a dependent show event target contains the given container then do not
  //   emit show / hide events (see Process() method)

  prevNode->mNext.reset(new EventTree(aContainer, mDependentEvents.IsEmpty()));
  return prevNode->mNext.get();
}