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https://github.com/mozilla/gecko-dev.git
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e5e885ae31
# ignore-this-changeset --HG-- extra : amend_source : 7221c8d15a765df71171099468e7c7faa648f37c extra : histedit_source : a0cce6015636202bff09e35a13f72e03257a7695
602 lines
19 KiB
C++
602 lines
19 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "EventTree.h"
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#include "Accessible-inl.h"
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#include "EmbeddedObjCollector.h"
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#include "NotificationController.h"
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#include "nsEventShell.h"
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#include "DocAccessible.h"
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#ifdef A11Y_LOG
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# include "Logging.h"
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#endif
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#include "mozilla/UniquePtr.h"
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using namespace mozilla;
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using namespace mozilla::a11y;
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////////////////////////////////////////////////////////////////////////////////
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// TreeMutation class
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EventTree* const TreeMutation::kNoEventTree = reinterpret_cast<EventTree*>(-1);
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TreeMutation::TreeMutation(Accessible* aParent, bool aNoEvents)
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: mParent(aParent),
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mStartIdx(UINT32_MAX),
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mStateFlagsCopy(mParent->mStateFlags),
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mQueueEvents(!aNoEvents) {
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#ifdef DEBUG
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mIsDone = false;
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#endif
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#ifdef A11Y_LOG
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if (mQueueEvents && logging::IsEnabled(logging::eEventTree)) {
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logging::MsgBegin("EVENTS_TREE", "reordering tree before");
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logging::AccessibleInfo("reordering for", mParent);
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Controller()->RootEventTree().Log();
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logging::MsgEnd();
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if (logging::IsEnabled(logging::eVerbose)) {
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logging::Tree("EVENTS_TREE", "Container tree", mParent->Document(),
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PrefixLog, static_cast<void*>(this));
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}
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}
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#endif
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mParent->mStateFlags |= Accessible::eKidsMutating;
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}
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TreeMutation::~TreeMutation() {
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MOZ_ASSERT(mIsDone, "Done() must be called explicitly");
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}
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void TreeMutation::AfterInsertion(Accessible* aChild) {
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MOZ_ASSERT(aChild->Parent() == mParent);
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if (static_cast<uint32_t>(aChild->mIndexInParent) < mStartIdx) {
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mStartIdx = aChild->mIndexInParent + 1;
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}
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if (!mQueueEvents) {
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return;
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}
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RefPtr<AccShowEvent> ev = new AccShowEvent(aChild);
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DebugOnly<bool> added = Controller()->QueueMutationEvent(ev);
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MOZ_ASSERT(added);
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aChild->SetShowEventTarget(true);
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}
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void TreeMutation::BeforeRemoval(Accessible* aChild, bool aNoShutdown) {
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MOZ_ASSERT(aChild->Parent() == mParent);
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if (static_cast<uint32_t>(aChild->mIndexInParent) < mStartIdx) {
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mStartIdx = aChild->mIndexInParent;
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}
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if (!mQueueEvents) {
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return;
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}
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RefPtr<AccHideEvent> ev = new AccHideEvent(aChild, !aNoShutdown);
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if (Controller()->QueueMutationEvent(ev)) {
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aChild->SetHideEventTarget(true);
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}
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}
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void TreeMutation::Done() {
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MOZ_ASSERT(mParent->mStateFlags & Accessible::eKidsMutating);
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mParent->mStateFlags &= ~Accessible::eKidsMutating;
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uint32_t length = mParent->mChildren.Length();
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#ifdef DEBUG
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for (uint32_t idx = 0; idx < mStartIdx && idx < length; idx++) {
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MOZ_ASSERT(
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mParent->mChildren[idx]->mIndexInParent == static_cast<int32_t>(idx),
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"Wrong index detected");
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}
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#endif
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for (uint32_t idx = mStartIdx; idx < length; idx++) {
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mParent->mChildren[idx]->mInt.mIndexOfEmbeddedChild = -1;
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}
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for (uint32_t idx = 0; idx < length; idx++) {
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mParent->mChildren[idx]->mStateFlags |= Accessible::eGroupInfoDirty;
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}
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mParent->mEmbeddedObjCollector = nullptr;
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mParent->mStateFlags |= mStateFlagsCopy & Accessible::eKidsMutating;
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#ifdef DEBUG
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mIsDone = true;
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#endif
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#ifdef A11Y_LOG
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if (mQueueEvents && logging::IsEnabled(logging::eEventTree)) {
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logging::MsgBegin("EVENTS_TREE", "reordering tree after");
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logging::AccessibleInfo("reordering for", mParent);
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Controller()->RootEventTree().Log();
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logging::MsgEnd();
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}
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#endif
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}
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#ifdef A11Y_LOG
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const char* TreeMutation::PrefixLog(void* aData, Accessible* aAcc) {
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TreeMutation* thisObj = reinterpret_cast<TreeMutation*>(aData);
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if (thisObj->mParent == aAcc) {
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return "_X_";
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}
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const EventTree& ret = thisObj->Controller()->RootEventTree();
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if (ret.Find(aAcc)) {
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return "_с_";
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}
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return "";
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}
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#endif
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////////////////////////////////////////////////////////////////////////////////
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// EventTree
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void EventTree::Shown(Accessible* aChild) {
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RefPtr<AccShowEvent> ev = new AccShowEvent(aChild);
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Controller(aChild)->WithdrawPrecedingEvents(&ev->mPrecedingEvents);
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Mutated(ev);
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}
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void EventTree::Hidden(Accessible* aChild, bool aNeedsShutdown) {
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RefPtr<AccHideEvent> ev = new AccHideEvent(aChild, aNeedsShutdown);
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if (!aNeedsShutdown) {
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Controller(aChild)->StorePrecedingEvent(ev);
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}
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Mutated(ev);
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}
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void EventTree::Process(const RefPtr<DocAccessible>& aDeathGrip) {
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while (mFirst) {
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// Skip a node and its subtree if its container is not in the document.
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if (mFirst->mContainer->IsInDocument()) {
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mFirst->Process(aDeathGrip);
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if (aDeathGrip->IsDefunct()) {
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return;
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}
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}
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mFirst = std::move(mFirst->mNext);
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}
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MOZ_ASSERT(mContainer || mDependentEvents.IsEmpty(),
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"No container, no events");
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MOZ_ASSERT(!mContainer || !mContainer->IsDefunct(),
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"Processing events for defunct container");
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MOZ_ASSERT(!mFireReorder || mContainer, "No target for reorder event");
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// Fire mutation events.
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uint32_t eventsCount = mDependentEvents.Length();
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for (uint32_t jdx = 0; jdx < eventsCount; jdx++) {
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AccMutationEvent* mtEvent = mDependentEvents[jdx];
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MOZ_ASSERT(mtEvent->Document(), "No document for event target");
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// Fire all hide events that has to be fired before this show event.
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if (mtEvent->IsShow()) {
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AccShowEvent* showEv = downcast_accEvent(mtEvent);
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for (uint32_t i = 0; i < showEv->mPrecedingEvents.Length(); i++) {
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nsEventShell::FireEvent(showEv->mPrecedingEvents[i]);
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if (aDeathGrip->IsDefunct()) {
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return;
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}
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}
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}
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nsEventShell::FireEvent(mtEvent);
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if (aDeathGrip->IsDefunct()) {
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return;
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}
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if (mtEvent->mTextChangeEvent) {
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nsEventShell::FireEvent(mtEvent->mTextChangeEvent);
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if (aDeathGrip->IsDefunct()) {
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return;
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}
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}
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if (mtEvent->IsHide()) {
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// Fire menupopup end event before a hide event if a menu goes away.
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// XXX: We don't look into children of hidden subtree to find hiding
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// menupopup (as we did prior bug 570275) because we don't do that when
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// menu is showing (and that's impossible until bug 606924 is fixed).
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// Nevertheless we should do this at least because layout coalesces
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// the changes before our processing and we may miss some menupopup
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// events. Now we just want to be consistent in content insertion/removal
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// handling.
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if (mtEvent->mAccessible->ARIARole() == roles::MENUPOPUP) {
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nsEventShell::FireEvent(nsIAccessibleEvent::EVENT_MENUPOPUP_END,
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mtEvent->mAccessible);
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if (aDeathGrip->IsDefunct()) {
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return;
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}
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}
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AccHideEvent* hideEvent = downcast_accEvent(mtEvent);
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if (hideEvent->NeedsShutdown()) {
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aDeathGrip->ShutdownChildrenInSubtree(mtEvent->mAccessible);
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}
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}
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}
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// Fire reorder event at last.
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if (mFireReorder) {
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nsEventShell::FireEvent(nsIAccessibleEvent::EVENT_REORDER, mContainer);
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mContainer->Document()->MaybeNotifyOfValueChange(mContainer);
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}
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mDependentEvents.Clear();
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}
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EventTree* EventTree::FindOrInsert(Accessible* aContainer) {
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if (!mFirst) {
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mFirst.reset(new EventTree(aContainer, mDependentEvents.IsEmpty()));
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return mFirst.get();
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}
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EventTree* prevNode = nullptr;
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EventTree* node = mFirst.get();
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do {
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MOZ_ASSERT(!node->mContainer->IsApplication(),
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"No event for application accessible is expected here");
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MOZ_ASSERT(!node->mContainer->IsDefunct(),
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"An event target has to be alive");
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// Case of same target.
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if (node->mContainer == aContainer) {
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return node;
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}
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// Check if the given container is contained by a current node
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Accessible* top = mContainer ? mContainer : aContainer->Document();
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Accessible* parent = aContainer;
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while (parent) {
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// Reached a top, no match for a current event.
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if (parent == top) {
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break;
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}
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// We got a match.
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if (parent->Parent() == node->mContainer) {
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// Reject the node if it's contained by a show/hide event target
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uint32_t evCount = node->mDependentEvents.Length();
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for (uint32_t idx = 0; idx < evCount; idx++) {
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AccMutationEvent* ev = node->mDependentEvents[idx];
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if (ev->GetAccessible() == parent) {
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#ifdef A11Y_LOG
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if (logging::IsEnabled(logging::eEventTree)) {
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logging::MsgBegin("EVENTS_TREE",
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"Rejecting node contained by show/hide");
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logging::AccessibleInfo("Node", aContainer);
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logging::MsgEnd();
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}
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#endif
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// If the node is rejected, then check if it has related hide event
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// on stack, and if so, then connect it to the parent show event.
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if (ev->IsShow()) {
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AccShowEvent* showEv = downcast_accEvent(ev);
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Controller(aContainer)
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->WithdrawPrecedingEvents(&showEv->mPrecedingEvents);
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}
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return nullptr;
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}
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}
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return node->FindOrInsert(aContainer);
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}
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parent = parent->Parent();
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MOZ_ASSERT(parent, "Wrong tree");
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}
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// If the given container contains a current node
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// then
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// if show or hide of the given node contains a grand parent of the
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// current node then ignore the current node and its show and hide events
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// otherwise ignore the current node, but not its show and hide events
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Accessible* curParent = node->mContainer;
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while (curParent && !curParent->IsDoc()) {
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if (curParent->Parent() != aContainer) {
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curParent = curParent->Parent();
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continue;
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}
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// Insert the tail node into the hierarchy between the current node and
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// its parent.
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node->mFireReorder = false;
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UniquePtr<EventTree>& nodeOwnerRef = prevNode ? prevNode->mNext : mFirst;
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UniquePtr<EventTree> newNode(
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new EventTree(aContainer, mDependentEvents.IsEmpty()));
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newNode->mFirst = std::move(nodeOwnerRef);
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nodeOwnerRef = std::move(newNode);
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nodeOwnerRef->mNext = std::move(node->mNext);
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// Check if a next node is contained by the given node too, and move them
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// under the given node if so.
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prevNode = nodeOwnerRef.get();
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node = nodeOwnerRef->mNext.get();
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UniquePtr<EventTree>* nodeRef = &nodeOwnerRef->mNext;
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EventTree* insNode = nodeOwnerRef->mFirst.get();
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while (node) {
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Accessible* curParent = node->mContainer;
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while (curParent && !curParent->IsDoc()) {
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if (curParent->Parent() != aContainer) {
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curParent = curParent->Parent();
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continue;
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}
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MOZ_ASSERT(!insNode->mNext);
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node->mFireReorder = false;
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insNode->mNext = std::move(*nodeRef);
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insNode = insNode->mNext.get();
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prevNode->mNext = std::move(node->mNext);
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node = prevNode;
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break;
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}
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prevNode = node;
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nodeRef = &node->mNext;
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node = node->mNext.get();
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}
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return nodeOwnerRef.get();
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}
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prevNode = node;
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} while ((node = node->mNext.get()));
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MOZ_ASSERT(prevNode, "Nowhere to insert");
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MOZ_ASSERT(!prevNode->mNext, "Taken by another node");
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// If 'this' node contains the given container accessible, then
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// do not emit a reorder event for the container
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// if a dependent show event target contains the given container then do not
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// emit show / hide events (see Process() method)
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prevNode->mNext.reset(new EventTree(aContainer, mDependentEvents.IsEmpty()));
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return prevNode->mNext.get();
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}
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void EventTree::Clear() {
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mFirst = nullptr;
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mNext = nullptr;
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mContainer = nullptr;
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uint32_t eventsCount = mDependentEvents.Length();
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for (uint32_t jdx = 0; jdx < eventsCount; jdx++) {
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mDependentEvents[jdx]->mEventType = AccEvent::eDoNotEmit;
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AccHideEvent* ev = downcast_accEvent(mDependentEvents[jdx]);
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if (ev && ev->NeedsShutdown()) {
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ev->Document()->ShutdownChildrenInSubtree(ev->mAccessible);
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}
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}
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mDependentEvents.Clear();
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}
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const EventTree* EventTree::Find(const Accessible* aContainer) const {
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const EventTree* et = this;
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while (et) {
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if (et->mContainer == aContainer) {
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return et;
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}
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if (et->mFirst) {
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et = et->mFirst.get();
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const EventTree* cet = et->Find(aContainer);
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if (cet) {
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return cet;
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}
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}
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et = et->mNext.get();
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const EventTree* cet = et->Find(aContainer);
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if (cet) {
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return cet;
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}
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}
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return nullptr;
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}
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#ifdef A11Y_LOG
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void EventTree::Log(uint32_t aLevel) const {
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if (aLevel == UINT32_MAX) {
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if (mFirst) {
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mFirst->Log(0);
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}
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return;
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}
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for (uint32_t i = 0; i < aLevel; i++) {
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printf(" ");
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}
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logging::AccessibleInfo("container", mContainer);
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for (uint32_t i = 0; i < mDependentEvents.Length(); i++) {
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AccMutationEvent* ev = mDependentEvents[i];
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if (ev->IsShow()) {
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for (uint32_t i = 0; i < aLevel + 1; i++) {
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printf(" ");
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}
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logging::AccessibleInfo("shown", ev->mAccessible);
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AccShowEvent* showEv = downcast_accEvent(ev);
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for (uint32_t i = 0; i < showEv->mPrecedingEvents.Length(); i++) {
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for (uint32_t j = 0; j < aLevel + 1; j++) {
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printf(" ");
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}
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logging::AccessibleInfo("preceding",
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showEv->mPrecedingEvents[i]->mAccessible);
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}
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} else {
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for (uint32_t i = 0; i < aLevel + 1; i++) {
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printf(" ");
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}
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logging::AccessibleInfo("hidden", ev->mAccessible);
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}
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}
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if (mFirst) {
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mFirst->Log(aLevel + 1);
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}
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if (mNext) {
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mNext->Log(aLevel);
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}
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}
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#endif
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void EventTree::Mutated(AccMutationEvent* aEv) {
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// If shown or hidden node is a root of previously mutated subtree, then
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// discard those subtree mutations as we are no longer interested in them.
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UniquePtr<EventTree>* node = &mFirst;
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while (*node) {
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Accessible* cntr = (*node)->mContainer;
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while (cntr != mContainer) {
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if (cntr == aEv->mAccessible) {
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#ifdef A11Y_LOG
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if (logging::IsEnabled(logging::eEventTree)) {
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logging::MsgBegin("EVENTS_TREE", "Trim subtree");
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logging::AccessibleInfo("Show/hide container", aEv->mAccessible);
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logging::AccessibleInfo("Trimmed subtree root", (*node)->mContainer);
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logging::MsgEnd();
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}
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#endif
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// If the new hide is part of a move and it contains existing child
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// shows, then move preceding events from the child shows to the buffer,
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// so the ongoing show event will pick them up.
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if (aEv->IsHide()) {
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AccHideEvent* hideEv = downcast_accEvent(aEv);
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if (!hideEv->mNeedsShutdown) {
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for (uint32_t i = 0; i < (*node)->mDependentEvents.Length(); i++) {
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AccMutationEvent* childEv = (*node)->mDependentEvents[i];
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if (childEv->IsShow()) {
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AccShowEvent* childShowEv = downcast_accEvent(childEv);
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if (childShowEv->mPrecedingEvents.Length() > 0) {
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Controller(mContainer)
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->StorePrecedingEvents(
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std::move(childShowEv->mPrecedingEvents));
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}
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}
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}
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}
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}
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// If the new show contains existing child shows, then move preceding
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// events from the child shows to the new show.
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else if (aEv->IsShow()) {
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AccShowEvent* showEv = downcast_accEvent(aEv);
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for (uint32_t i = 0; (*node)->mDependentEvents.Length(); i++) {
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AccMutationEvent* childEv = (*node)->mDependentEvents[i];
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if (childEv->IsShow()) {
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AccShowEvent* showChildEv = downcast_accEvent(childEv);
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if (showChildEv->mPrecedingEvents.Length() > 0) {
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#ifdef A11Y_LOG
|
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if (logging::IsEnabled(logging::eEventTree)) {
|
||
logging::MsgBegin("EVENTS_TREE", "Adopt preceding events");
|
||
logging::AccessibleInfo("Parent", aEv->mAccessible);
|
||
for (uint32_t j = 0;
|
||
j < showChildEv->mPrecedingEvents.Length(); j++) {
|
||
logging::AccessibleInfo(
|
||
"Adoptee",
|
||
showChildEv->mPrecedingEvents[i]->mAccessible);
|
||
}
|
||
logging::MsgEnd();
|
||
}
|
||
#endif
|
||
showEv->mPrecedingEvents.AppendElements(
|
||
showChildEv->mPrecedingEvents);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
*node = std::move((*node)->mNext);
|
||
break;
|
||
}
|
||
cntr = cntr->Parent();
|
||
}
|
||
if (cntr == aEv->mAccessible) {
|
||
continue;
|
||
}
|
||
node = &(*node)->mNext;
|
||
}
|
||
|
||
AccMutationEvent* prevEvent = mDependentEvents.SafeLastElement(nullptr);
|
||
mDependentEvents.AppendElement(aEv);
|
||
|
||
// Coalesce text change events from this hide/show event and the previous one.
|
||
if (prevEvent && aEv->mEventType == prevEvent->mEventType) {
|
||
if (aEv->IsHide()) {
|
||
// XXX: we need a way to ignore SplitNode and JoinNode() when they do not
|
||
// affect the text within the hypertext.
|
||
AccTextChangeEvent* prevTextEvent = prevEvent->mTextChangeEvent;
|
||
if (prevTextEvent) {
|
||
AccHideEvent* hideEvent = downcast_accEvent(aEv);
|
||
AccHideEvent* prevHideEvent = downcast_accEvent(prevEvent);
|
||
|
||
if (prevHideEvent->mNextSibling == hideEvent->mAccessible) {
|
||
hideEvent->mAccessible->AppendTextTo(prevTextEvent->mModifiedText);
|
||
} else if (prevHideEvent->mPrevSibling == hideEvent->mAccessible) {
|
||
uint32_t oldLen = prevTextEvent->GetLength();
|
||
hideEvent->mAccessible->AppendTextTo(prevTextEvent->mModifiedText);
|
||
prevTextEvent->mStart -= prevTextEvent->GetLength() - oldLen;
|
||
}
|
||
|
||
hideEvent->mTextChangeEvent.swap(prevEvent->mTextChangeEvent);
|
||
}
|
||
} else {
|
||
AccTextChangeEvent* prevTextEvent = prevEvent->mTextChangeEvent;
|
||
if (prevTextEvent) {
|
||
if (aEv->mAccessible->IndexInParent() ==
|
||
prevEvent->mAccessible->IndexInParent() + 1) {
|
||
// If tail target was inserted after this target, i.e. tail target is
|
||
// next sibling of this target.
|
||
aEv->mAccessible->AppendTextTo(prevTextEvent->mModifiedText);
|
||
} else if (aEv->mAccessible->IndexInParent() ==
|
||
prevEvent->mAccessible->IndexInParent() - 1) {
|
||
// If tail target was inserted before this target, i.e. tail target is
|
||
// previous sibling of this target.
|
||
nsAutoString startText;
|
||
aEv->mAccessible->AppendTextTo(startText);
|
||
prevTextEvent->mModifiedText =
|
||
startText + prevTextEvent->mModifiedText;
|
||
prevTextEvent->mStart -= startText.Length();
|
||
}
|
||
|
||
aEv->mTextChangeEvent.swap(prevEvent->mTextChangeEvent);
|
||
}
|
||
}
|
||
}
|
||
|
||
// Create a text change event caused by this hide/show event. When a node is
|
||
// hidden/removed or shown/appended, the text in an ancestor hyper text will
|
||
// lose or get new characters.
|
||
if (aEv->mTextChangeEvent || !mContainer->IsHyperText()) {
|
||
return;
|
||
}
|
||
|
||
nsAutoString text;
|
||
aEv->mAccessible->AppendTextTo(text);
|
||
if (text.IsEmpty()) {
|
||
return;
|
||
}
|
||
|
||
int32_t offset = mContainer->AsHyperText()->GetChildOffset(aEv->mAccessible);
|
||
aEv->mTextChangeEvent = new AccTextChangeEvent(
|
||
mContainer, offset, text, aEv->IsShow(),
|
||
aEv->mIsFromUserInput ? eFromUserInput : eNoUserInput);
|
||
}
|