562 lines
20 KiB
C++
562 lines
20 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 "EventQueue.h"
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#include "Accessible-inl.h"
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#include "nsEventShell.h"
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#include "DocAccessible.h"
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#include "DocAccessibleChild.h"
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#include "nsAccessibilityService.h"
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#include "nsTextEquivUtils.h"
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#ifdef A11Y_LOG
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#include "Logging.h"
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#endif
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using namespace mozilla;
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using namespace mozilla::a11y;
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// Defines the number of selection add/remove events in the queue when they
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// aren't packed into single selection within event.
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const unsigned int kSelChangeCountToPack = 5;
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////////////////////////////////////////////////////////////////////////////////
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// EventQueue
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////////////////////////////////////////////////////////////////////////////////
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bool
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EventQueue::PushEvent(AccEvent* aEvent)
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{
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NS_ASSERTION((aEvent->mAccessible && aEvent->mAccessible->IsApplication()) ||
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aEvent->GetDocAccessible() == mDocument,
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"Queued event belongs to another document!");
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if (!mEvents.AppendElement(aEvent))
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return false;
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// Filter events.
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CoalesceEvents();
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// Fire name change event on parent given that this event hasn't been
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// coalesced, the parent's name was calculated from its subtree, and the
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// subtree was changed.
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Accessible* target = aEvent->mAccessible;
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if (aEvent->mEventRule != AccEvent::eDoNotEmit &&
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target->HasNameDependentParent() &&
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(aEvent->mEventType == nsIAccessibleEvent::EVENT_NAME_CHANGE ||
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aEvent->mEventType == nsIAccessibleEvent::EVENT_TEXT_REMOVED ||
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aEvent->mEventType == nsIAccessibleEvent::EVENT_TEXT_INSERTED ||
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aEvent->mEventType == nsIAccessibleEvent::EVENT_SHOW ||
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aEvent->mEventType == nsIAccessibleEvent::EVENT_HIDE)) {
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// Only continue traversing up the tree if it's possible that the parent
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// accessible's name can depend on this accessible's name.
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Accessible* parent = target->Parent();
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while (parent &&
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nsTextEquivUtils::HasNameRule(parent, eNameFromSubtreeIfReqRule)) {
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// Test possible name dependent parent.
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if (nsTextEquivUtils::HasNameRule(parent, eNameFromSubtreeRule)) {
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nsAutoString name;
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ENameValueFlag nameFlag = parent->Name(name);
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// If name is obtained from subtree, fire name change event.
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if (nameFlag == eNameFromSubtree) {
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RefPtr<AccEvent> nameChangeEvent =
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new AccEvent(nsIAccessibleEvent::EVENT_NAME_CHANGE, parent);
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PushEvent(nameChangeEvent);
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}
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break;
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}
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parent = parent->Parent();
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}
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}
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// Associate text change with hide event if it wasn't stolen from hiding
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// siblings during coalescence.
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AccMutationEvent* showOrHideEvent = downcast_accEvent(aEvent);
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if (showOrHideEvent && !showOrHideEvent->mTextChangeEvent)
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CreateTextChangeEventFor(showOrHideEvent);
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return true;
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}
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////////////////////////////////////////////////////////////////////////////////
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// EventQueue: private
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void
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EventQueue::CoalesceEvents()
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{
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NS_ASSERTION(mEvents.Length(), "There should be at least one pending event!");
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uint32_t tail = mEvents.Length() - 1;
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AccEvent* tailEvent = mEvents[tail];
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switch(tailEvent->mEventRule) {
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case AccEvent::eCoalesceReorder:
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CoalesceReorderEvents(tailEvent);
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break; // case eCoalesceReorder
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case AccEvent::eCoalesceMutationTextChange:
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{
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for (uint32_t index = tail - 1; index < tail; index--) {
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AccEvent* thisEvent = mEvents[index];
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if (thisEvent->mEventRule != tailEvent->mEventRule)
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continue;
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// We don't currently coalesce text change events from show/hide events.
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if (thisEvent->mEventType != tailEvent->mEventType)
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continue;
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// Show events may be duped because of reinsertion (removal is ignored
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// because initial insertion is not processed). Ignore initial
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// insertion.
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if (thisEvent->mAccessible == tailEvent->mAccessible)
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thisEvent->mEventRule = AccEvent::eDoNotEmit;
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AccMutationEvent* tailMutationEvent = downcast_accEvent(tailEvent);
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AccMutationEvent* thisMutationEvent = downcast_accEvent(thisEvent);
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if (tailMutationEvent->mParent != thisMutationEvent->mParent)
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continue;
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// Coalesce text change events for hide and show events.
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if (thisMutationEvent->IsHide()) {
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AccHideEvent* tailHideEvent = downcast_accEvent(tailEvent);
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AccHideEvent* thisHideEvent = downcast_accEvent(thisEvent);
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CoalesceTextChangeEventsFor(tailHideEvent, thisHideEvent);
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break;
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}
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AccShowEvent* tailShowEvent = downcast_accEvent(tailEvent);
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AccShowEvent* thisShowEvent = downcast_accEvent(thisEvent);
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CoalesceTextChangeEventsFor(tailShowEvent, thisShowEvent);
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break;
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}
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} break; // case eCoalesceMutationTextChange
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case AccEvent::eCoalesceOfSameType:
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{
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// Coalesce old events by newer event.
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for (uint32_t index = tail - 1; index < tail; index--) {
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AccEvent* accEvent = mEvents[index];
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if (accEvent->mEventType == tailEvent->mEventType &&
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accEvent->mEventRule == tailEvent->mEventRule) {
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accEvent->mEventRule = AccEvent::eDoNotEmit;
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return;
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}
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}
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} break; // case eCoalesceOfSameType
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case AccEvent::eCoalesceSelectionChange:
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{
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AccSelChangeEvent* tailSelChangeEvent = downcast_accEvent(tailEvent);
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for (uint32_t index = tail - 1; index < tail; index--) {
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AccEvent* thisEvent = mEvents[index];
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if (thisEvent->mEventRule == tailEvent->mEventRule) {
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AccSelChangeEvent* thisSelChangeEvent =
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downcast_accEvent(thisEvent);
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// Coalesce selection change events within same control.
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if (tailSelChangeEvent->mWidget == thisSelChangeEvent->mWidget) {
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CoalesceSelChangeEvents(tailSelChangeEvent, thisSelChangeEvent, index);
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return;
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}
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}
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}
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} break; // eCoalesceSelectionChange
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case AccEvent::eCoalesceStateChange:
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{
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// If state change event is duped then ignore previous event. If state
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// change event is opposite to previous event then no event is emitted
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// (accessible state wasn't changed).
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for (uint32_t index = tail - 1; index < tail; index--) {
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AccEvent* thisEvent = mEvents[index];
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if (thisEvent->mEventRule != AccEvent::eDoNotEmit &&
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thisEvent->mEventType == tailEvent->mEventType &&
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thisEvent->mAccessible == tailEvent->mAccessible) {
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AccStateChangeEvent* thisSCEvent = downcast_accEvent(thisEvent);
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AccStateChangeEvent* tailSCEvent = downcast_accEvent(tailEvent);
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if (thisSCEvent->mState == tailSCEvent->mState) {
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thisEvent->mEventRule = AccEvent::eDoNotEmit;
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if (thisSCEvent->mIsEnabled != tailSCEvent->mIsEnabled)
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tailEvent->mEventRule = AccEvent::eDoNotEmit;
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}
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}
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}
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break; // eCoalesceStateChange
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}
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case AccEvent::eCoalesceTextSelChange:
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{
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// Coalesce older event by newer event for the same selection or target.
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// Events for same selection may have different targets and vice versa one
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// target may be pointed by different selections (for latter see
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// bug 927159).
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for (uint32_t index = tail - 1; index < tail; index--) {
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AccEvent* thisEvent = mEvents[index];
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if (thisEvent->mEventRule != AccEvent::eDoNotEmit &&
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thisEvent->mEventType == tailEvent->mEventType) {
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AccTextSelChangeEvent* thisTSCEvent = downcast_accEvent(thisEvent);
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AccTextSelChangeEvent* tailTSCEvent = downcast_accEvent(tailEvent);
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if (thisTSCEvent->mSel == tailTSCEvent->mSel ||
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thisEvent->mAccessible == tailEvent->mAccessible)
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thisEvent->mEventRule = AccEvent::eDoNotEmit;
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}
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}
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} break; // eCoalesceTextSelChange
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case AccEvent::eRemoveDupes:
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{
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// Check for repeat events, coalesce newly appended event by more older
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// event.
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for (uint32_t index = tail - 1; index < tail; index--) {
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AccEvent* accEvent = mEvents[index];
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if (accEvent->mEventType == tailEvent->mEventType &&
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accEvent->mEventRule == tailEvent->mEventRule &&
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accEvent->mAccessible == tailEvent->mAccessible) {
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tailEvent->mEventRule = AccEvent::eDoNotEmit;
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return;
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}
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}
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} break; // case eRemoveDupes
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default:
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break; // case eAllowDupes, eDoNotEmit
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} // switch
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}
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void
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EventQueue::CoalesceReorderEvents(AccEvent* aTailEvent)
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{
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uint32_t count = mEvents.Length();
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for (uint32_t index = count - 2; index < count; index--) {
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AccEvent* thisEvent = mEvents[index];
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// Skip events of different types and targeted to application accessible.
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if (thisEvent->mEventType != aTailEvent->mEventType ||
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thisEvent->mAccessible->IsApplication())
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continue;
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// If thisEvent target is not in document longer, i.e. if it was
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// removed from the tree then do not emit the event.
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if (!thisEvent->mAccessible->IsDoc() &&
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!thisEvent->mAccessible->IsInDocument()) {
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thisEvent->mEventRule = AccEvent::eDoNotEmit;
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continue;
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}
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// Coalesce earlier event of the same target.
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if (thisEvent->mAccessible == aTailEvent->mAccessible) {
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thisEvent->mEventRule = AccEvent::eDoNotEmit;
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return;
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}
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// If tailEvent contains thisEvent
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// then
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// if show or hide of tailEvent contains a grand parent of thisEvent
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// then ignore thisEvent and its show and hide events
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// otherwise ignore thisEvent but not its show and hide events
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Accessible* thisParent = thisEvent->mAccessible;
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while (thisParent && thisParent != mDocument) {
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if (thisParent->Parent() == aTailEvent->mAccessible) {
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AccReorderEvent* tailReorder = downcast_accEvent(aTailEvent);
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uint32_t eventType = tailReorder->IsShowHideEventTarget(thisParent);
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// Sometimes InvalidateChildren() and
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// DocAccessible::CacheChildrenInSubtree() can conspire to reparent an
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// accessible in this case no need for mutation events. Se bug 883708
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// for details.
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if (eventType == nsIAccessibleEvent::EVENT_SHOW ||
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eventType == nsIAccessibleEvent::EVENT_HIDE) {
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AccReorderEvent* thisReorder = downcast_accEvent(thisEvent);
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thisReorder->DoNotEmitAll();
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} else {
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thisEvent->mEventRule = AccEvent::eDoNotEmit;
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}
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return;
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}
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thisParent = thisParent->Parent();
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}
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// If tailEvent is contained by thisEvent
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// then
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// if show of thisEvent contains the tailEvent
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// then ignore tailEvent
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// if hide of thisEvent contains the tailEvent
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// then assert
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// otherwise ignore tailEvent but not its show and hide events
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Accessible* tailParent = aTailEvent->mAccessible;
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while (tailParent && tailParent != mDocument) {
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if (tailParent->Parent() == thisEvent->mAccessible) {
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AccReorderEvent* thisReorder = downcast_accEvent(thisEvent);
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AccReorderEvent* tailReorder = downcast_accEvent(aTailEvent);
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uint32_t eventType = thisReorder->IsShowHideEventTarget(tailParent);
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if (eventType == nsIAccessibleEvent::EVENT_SHOW) {
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tailReorder->DoNotEmitAll();
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}
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else if (eventType == nsIAccessibleEvent::EVENT_HIDE) {
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NS_ERROR("Accessible tree was modified after it was removed! Huh?");
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}
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else {
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aTailEvent->mEventRule = AccEvent::eDoNotEmit;
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mEvents[index].swap(mEvents[count - 1]);
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}
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return;
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}
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tailParent = tailParent->Parent();
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}
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} // for (index)
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}
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void
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EventQueue::CoalesceSelChangeEvents(AccSelChangeEvent* aTailEvent,
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AccSelChangeEvent* aThisEvent,
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uint32_t aThisIndex)
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{
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aTailEvent->mPreceedingCount = aThisEvent->mPreceedingCount + 1;
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// Pack all preceding events into single selection within event
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// when we receive too much selection add/remove events.
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if (aTailEvent->mPreceedingCount >= kSelChangeCountToPack) {
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aTailEvent->mEventType = nsIAccessibleEvent::EVENT_SELECTION_WITHIN;
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aTailEvent->mAccessible = aTailEvent->mWidget;
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aThisEvent->mEventRule = AccEvent::eDoNotEmit;
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// Do not emit any preceding selection events for same widget if they
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// weren't coalesced yet.
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if (aThisEvent->mEventType != nsIAccessibleEvent::EVENT_SELECTION_WITHIN) {
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for (uint32_t jdx = aThisIndex - 1; jdx < aThisIndex; jdx--) {
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AccEvent* prevEvent = mEvents[jdx];
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if (prevEvent->mEventRule == aTailEvent->mEventRule) {
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AccSelChangeEvent* prevSelChangeEvent =
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downcast_accEvent(prevEvent);
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if (prevSelChangeEvent->mWidget == aTailEvent->mWidget)
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prevSelChangeEvent->mEventRule = AccEvent::eDoNotEmit;
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}
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}
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}
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return;
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}
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// Pack sequential selection remove and selection add events into
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// single selection change event.
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if (aTailEvent->mPreceedingCount == 1 &&
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aTailEvent->mItem != aThisEvent->mItem) {
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if (aTailEvent->mSelChangeType == AccSelChangeEvent::eSelectionAdd &&
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aThisEvent->mSelChangeType == AccSelChangeEvent::eSelectionRemove) {
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aThisEvent->mEventRule = AccEvent::eDoNotEmit;
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aTailEvent->mEventType = nsIAccessibleEvent::EVENT_SELECTION;
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aTailEvent->mPackedEvent = aThisEvent;
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return;
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}
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if (aThisEvent->mSelChangeType == AccSelChangeEvent::eSelectionAdd &&
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aTailEvent->mSelChangeType == AccSelChangeEvent::eSelectionRemove) {
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aTailEvent->mEventRule = AccEvent::eDoNotEmit;
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aThisEvent->mEventType = nsIAccessibleEvent::EVENT_SELECTION;
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aThisEvent->mPackedEvent = aTailEvent;
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return;
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}
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}
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// Unpack the packed selection change event because we've got one
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// more selection add/remove.
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if (aThisEvent->mEventType == nsIAccessibleEvent::EVENT_SELECTION) {
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if (aThisEvent->mPackedEvent) {
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aThisEvent->mPackedEvent->mEventType =
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aThisEvent->mPackedEvent->mSelChangeType == AccSelChangeEvent::eSelectionAdd ?
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nsIAccessibleEvent::EVENT_SELECTION_ADD :
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nsIAccessibleEvent::EVENT_SELECTION_REMOVE;
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aThisEvent->mPackedEvent->mEventRule =
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AccEvent::eCoalesceSelectionChange;
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aThisEvent->mPackedEvent = nullptr;
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}
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aThisEvent->mEventType =
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aThisEvent->mSelChangeType == AccSelChangeEvent::eSelectionAdd ?
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nsIAccessibleEvent::EVENT_SELECTION_ADD :
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nsIAccessibleEvent::EVENT_SELECTION_REMOVE;
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return;
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}
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// Convert into selection add since control has single selection but other
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// selection events for this control are queued.
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if (aTailEvent->mEventType == nsIAccessibleEvent::EVENT_SELECTION)
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aTailEvent->mEventType = nsIAccessibleEvent::EVENT_SELECTION_ADD;
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}
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void
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EventQueue::CoalesceTextChangeEventsFor(AccHideEvent* aTailEvent,
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AccHideEvent* aThisEvent)
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{
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// XXX: we need a way to ignore SplitNode and JoinNode() when they do not
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// affect the text within the hypertext.
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AccTextChangeEvent* textEvent = aThisEvent->mTextChangeEvent;
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if (!textEvent)
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return;
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if (aThisEvent->mNextSibling == aTailEvent->mAccessible) {
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aTailEvent->mAccessible->AppendTextTo(textEvent->mModifiedText);
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} else if (aThisEvent->mPrevSibling == aTailEvent->mAccessible) {
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uint32_t oldLen = textEvent->GetLength();
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aTailEvent->mAccessible->AppendTextTo(textEvent->mModifiedText);
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textEvent->mStart -= textEvent->GetLength() - oldLen;
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}
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aTailEvent->mTextChangeEvent.swap(aThisEvent->mTextChangeEvent);
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}
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void
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EventQueue::CoalesceTextChangeEventsFor(AccShowEvent* aTailEvent,
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AccShowEvent* aThisEvent)
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{
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AccTextChangeEvent* textEvent = aThisEvent->mTextChangeEvent;
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if (!textEvent)
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return;
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if (aTailEvent->mAccessible->IndexInParent() ==
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aThisEvent->mAccessible->IndexInParent() + 1) {
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// If tail target was inserted after this target, i.e. tail target is next
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// sibling of this target.
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aTailEvent->mAccessible->AppendTextTo(textEvent->mModifiedText);
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} else if (aTailEvent->mAccessible->IndexInParent() ==
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aThisEvent->mAccessible->IndexInParent() -1) {
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// If tail target was inserted before this target, i.e. tail target is
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// previous sibling of this target.
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nsAutoString startText;
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aTailEvent->mAccessible->AppendTextTo(startText);
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textEvent->mModifiedText = startText + textEvent->mModifiedText;
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textEvent->mStart -= startText.Length();
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}
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aTailEvent->mTextChangeEvent.swap(aThisEvent->mTextChangeEvent);
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}
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void
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EventQueue::CreateTextChangeEventFor(AccMutationEvent* aEvent)
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{
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Accessible* container = aEvent->mAccessible->Parent();
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if (!container)
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return;
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HyperTextAccessible* textAccessible = container->AsHyperText();
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if (!textAccessible)
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return;
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// Don't fire event for the first html:br in an editor.
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if (aEvent->mAccessible->Role() == roles::WHITESPACE) {
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nsCOMPtr<nsIEditor> editor = textAccessible->GetEditor();
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if (editor) {
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bool isEmpty = false;
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editor->GetDocumentIsEmpty(&isEmpty);
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if (isEmpty)
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return;
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}
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}
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int32_t offset = textAccessible->GetChildOffset(aEvent->mAccessible);
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nsAutoString text;
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aEvent->mAccessible->AppendTextTo(text);
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if (text.IsEmpty())
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return;
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aEvent->mTextChangeEvent =
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new AccTextChangeEvent(textAccessible, offset, text, aEvent->IsShow(),
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aEvent->mIsFromUserInput ? eFromUserInput : eNoUserInput);
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}
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////////////////////////////////////////////////////////////////////////////////
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// EventQueue: event queue
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void
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EventQueue::ProcessEventQueue()
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{
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// Process only currently queued events.
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nsTArray<RefPtr<AccEvent> > events;
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events.SwapElements(mEvents);
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uint32_t eventCount = events.Length();
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#ifdef A11Y_LOG
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if (eventCount > 0 && logging::IsEnabled(logging::eEvents)) {
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logging::MsgBegin("EVENTS", "events processing");
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logging::Address("document", mDocument);
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logging::MsgEnd();
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}
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#endif
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for (uint32_t idx = 0; idx < eventCount; idx++) {
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AccEvent* event = events[idx];
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if (event->mEventRule != AccEvent::eDoNotEmit) {
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Accessible* target = event->GetAccessible();
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if (!target || target->IsDefunct())
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continue;
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// Dispatch the focus event if target is still focused.
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if (event->mEventType == nsIAccessibleEvent::EVENT_FOCUS) {
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FocusMgr()->ProcessFocusEvent(event);
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continue;
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}
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// Dispatch caret moved and text selection change events.
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if (event->mEventType == nsIAccessibleEvent::EVENT_TEXT_SELECTION_CHANGED) {
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SelectionMgr()->ProcessTextSelChangeEvent(event);
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continue;
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}
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// Fire selected state change events in support to selection events.
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if (event->mEventType == nsIAccessibleEvent::EVENT_SELECTION_ADD) {
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nsEventShell::FireEvent(event->mAccessible, states::SELECTED,
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true, event->mIsFromUserInput);
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} else if (event->mEventType == nsIAccessibleEvent::EVENT_SELECTION_REMOVE) {
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nsEventShell::FireEvent(event->mAccessible, states::SELECTED,
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false, event->mIsFromUserInput);
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} else if (event->mEventType == nsIAccessibleEvent::EVENT_SELECTION) {
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AccSelChangeEvent* selChangeEvent = downcast_accEvent(event);
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nsEventShell::FireEvent(event->mAccessible, states::SELECTED,
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(selChangeEvent->mSelChangeType == AccSelChangeEvent::eSelectionAdd),
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event->mIsFromUserInput);
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if (selChangeEvent->mPackedEvent) {
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nsEventShell::FireEvent(selChangeEvent->mPackedEvent->mAccessible,
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states::SELECTED,
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(selChangeEvent->mPackedEvent->mSelChangeType == AccSelChangeEvent::eSelectionAdd),
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selChangeEvent->mPackedEvent->mIsFromUserInput);
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}
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}
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nsEventShell::FireEvent(event);
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// Fire text change events.
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AccMutationEvent* mutationEvent = downcast_accEvent(event);
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if (mutationEvent) {
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if (mutationEvent->mTextChangeEvent)
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nsEventShell::FireEvent(mutationEvent->mTextChangeEvent);
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}
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}
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AccHideEvent* hideEvent = downcast_accEvent(event);
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if (hideEvent && hideEvent->NeedsShutdown()) {
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mDocument->ShutdownChildrenInSubtree(event->mAccessible);
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}
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if (!mDocument)
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return;
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}
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}
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