accessible/base/EventTree.cpp

   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 #include "mozilla/UniquePtr.h"
  15
  16 using namespace mozilla;
  17 using namespace mozilla::a11y;
  18
  19 ////////////////////////////////////////////////////////////////////////////////
  20 // TreeMutation class
  21
  22 TreeMutation::TreeMutation(LocalAccessible* aParent, bool aNoEvents)
  23     : mParent(aParent),
  24       mStartIdx(UINT32_MAX),
  25       mStateFlagsCopy(mParent->mStateFlags),
  26       mQueueEvents(!aNoEvents) {
  27 #ifdef DEBUG
  28   mIsDone = false;
  29 #endif
  30
  31   mParent->mStateFlags |= LocalAccessible::eKidsMutating;
  32 }
  33
  34 TreeMutation::~TreeMutation() {
  35   MOZ_ASSERT(mIsDone, "Done() must be called explicitly");
  36 }
  37
  38 void TreeMutation::AfterInsertion(LocalAccessible* aChild) {
  39   MOZ_ASSERT(aChild->LocalParent() == mParent);
  40
  41   if (static_cast<uint32_t>(aChild->mIndexInParent) < mStartIdx) {
  42     mStartIdx = aChild->mIndexInParent + 1;
  43   }
  44
  45   if (!mQueueEvents) {
  46     return;
  47   }
  48
  49   RefPtr<AccShowEvent> ev = new AccShowEvent(aChild);
  50   DebugOnly<bool> added = Controller()->QueueMutationEvent(ev);
  51   MOZ_ASSERT(added);
  52   aChild->SetShowEventTarget(true);
  53 }
  54
  55 void TreeMutation::BeforeRemoval(LocalAccessible* aChild, bool aNoShutdown) {
  56   MOZ_ASSERT(aChild->LocalParent() == mParent);
  57
  58   if (static_cast<uint32_t>(aChild->mIndexInParent) < mStartIdx) {
  59     mStartIdx = aChild->mIndexInParent;
  60   }
  61
  62   if (!mQueueEvents) {
  63     return;
  64   }
  65
  66   RefPtr<AccHideEvent> ev = new AccHideEvent(aChild, !aNoShutdown);
  67   if (Controller()->QueueMutationEvent(ev)) {
  68     aChild->SetHideEventTarget(true);
  69   }
  70 }
  71
  72 void TreeMutation::Done() {
  73   MOZ_ASSERT(mParent->mStateFlags & LocalAccessible::eKidsMutating);
  74   mParent->mStateFlags &= ~LocalAccessible::eKidsMutating;
  75
  76   uint32_t length = mParent->mChildren.Length();
  77 #ifdef DEBUG
  78   for (uint32_t idx = 0; idx < mStartIdx && idx < length; idx++) {
  79     MOZ_ASSERT(
  80         mParent->mChildren[idx]->mIndexInParent == static_cast<int32_t>(idx),
  81         "Wrong index detected");
  82   }
  83 #endif
  84
  85   for (uint32_t idx = mStartIdx; idx < length; idx++) {
  86     mParent->mChildren[idx]->mIndexOfEmbeddedChild = -1;
  87   }
  88
  89   for (uint32_t idx = 0; idx < length; idx++) {
  90     mParent->mChildren[idx]->mStateFlags |= LocalAccessible::eGroupInfoDirty;
  91   }
  92
  93   mParent->mEmbeddedObjCollector = nullptr;
  94   mParent->mStateFlags |= mStateFlagsCopy & LocalAccessible::eKidsMutating;
  95
  96 #ifdef DEBUG
  97   mIsDone = true;
  98 #endif
  99 }