tor-browser

The Tor Browser
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EventTree.cpp (2700B)

      1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* This Source Code Form is subject to the terms of the Mozilla Public
      3 * License, v. 2.0. If a copy of the MPL was not distributed with this
      4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      5 
      6 #include "EventTree.h"
      7 
      8 #include "EmbeddedObjCollector.h"
      9 #include "NotificationController.h"
     10 #ifdef A11Y_LOG
     11 #  include "Logging.h"
     12 #endif
     13 
     14 using namespace mozilla;
     15 using namespace mozilla::a11y;
     16 
     17 ////////////////////////////////////////////////////////////////////////////////
     18 // TreeMutation class
     19 
     20 TreeMutation::TreeMutation(LocalAccessible* aParent, bool aNoEvents)
     21    : mParent(aParent),
     22      mStartIdx(UINT32_MAX),
     23      mStateFlagsCopy(mParent->mStateFlags),
     24      mQueueEvents(!aNoEvents) {
     25 #ifdef DEBUG
     26  mIsDone = false;
     27 #endif
     28 
     29  mParent->mStateFlags |= LocalAccessible::eKidsMutating;
     30 }
     31 
     32 TreeMutation::~TreeMutation() {
     33  MOZ_ASSERT(mIsDone, "Done() must be called explicitly");
     34 }
     35 
     36 void TreeMutation::AfterInsertion(LocalAccessible* aChild) {
     37  MOZ_ASSERT(aChild->LocalParent() == mParent);
     38 
     39  if (static_cast<uint32_t>(aChild->mIndexInParent) < mStartIdx) {
     40    mStartIdx = aChild->mIndexInParent + 1;
     41  }
     42 
     43  if (!mQueueEvents) {
     44    return;
     45  }
     46 
     47  RefPtr<AccShowEvent> ev = new AccShowEvent(aChild);
     48  DebugOnly<bool> added = Controller()->QueueMutationEvent(ev);
     49  MOZ_ASSERT(added);
     50  aChild->SetShowEventTarget(true);
     51 }
     52 
     53 void TreeMutation::BeforeRemoval(LocalAccessible* aChild, bool aNoShutdown) {
     54  MOZ_ASSERT(aChild->LocalParent() == mParent);
     55 
     56  if (static_cast<uint32_t>(aChild->mIndexInParent) < mStartIdx) {
     57    mStartIdx = aChild->mIndexInParent;
     58  }
     59 
     60  if (!mQueueEvents) {
     61    return;
     62  }
     63 
     64  RefPtr<AccHideEvent> ev = new AccHideEvent(aChild, !aNoShutdown);
     65  if (Controller()->QueueMutationEvent(ev)) {
     66    aChild->SetHideEventTarget(true);
     67  }
     68 }
     69 
     70 void TreeMutation::Done() {
     71  MOZ_ASSERT(mParent->mStateFlags & LocalAccessible::eKidsMutating);
     72  mParent->mStateFlags &= ~LocalAccessible::eKidsMutating;
     73 
     74  uint32_t length = mParent->mChildren.Length();
     75 #ifdef DEBUG
     76  for (uint32_t idx = 0; idx < mStartIdx && idx < length; idx++) {
     77    MOZ_ASSERT(
     78        mParent->mChildren[idx]->mIndexInParent == static_cast<int32_t>(idx),
     79        "Wrong index detected");
     80  }
     81 #endif
     82 
     83  for (uint32_t idx = mStartIdx; idx < length; idx++) {
     84    mParent->mChildren[idx]->mIndexOfEmbeddedChild = -1;
     85  }
     86 
     87  for (uint32_t idx = 0; idx < length; idx++) {
     88    mParent->mChildren[idx]->mStateFlags |= LocalAccessible::eGroupInfoDirty;
     89  }
     90 
     91  mParent->mEmbeddedObjCollector = nullptr;
     92  mParent->mStateFlags |= mStateFlagsCopy & LocalAccessible::eKidsMutating;
     93 
     94 #ifdef DEBUG
     95  mIsDone = true;
     96 #endif
     97 }