271 lines
11 KiB
C++
271 lines
11 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 "AccEvent.h"
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#include "nsAccUtils.h"
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#include "DocAccessible.h"
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#include "xpcAccEvents.h"
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#include "States.h"
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#include "xpcAccessibleDocument.h"
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#include "mozilla/EventStateManager.h"
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#include "mozilla/dom/Selection.h"
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using namespace mozilla;
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using namespace mozilla::a11y;
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static_assert(static_cast<bool>(eNoUserInput) == false &&
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static_cast<bool>(eFromUserInput) == true,
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"EIsFromUserInput cannot be casted to bool");
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////////////////////////////////////////////////////////////////////////////////
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// AccEvent
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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// AccEvent constructors
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AccEvent::AccEvent(uint32_t aEventType, Accessible* aAccessible,
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EIsFromUserInput aIsFromUserInput, EEventRule aEventRule) :
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mEventType(aEventType), mEventRule(aEventRule), mAccessible(aAccessible)
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{
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if (aIsFromUserInput == eAutoDetect)
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mIsFromUserInput = EventStateManager::IsHandlingUserInput();
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else
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mIsFromUserInput = aIsFromUserInput == eFromUserInput ? true : false;
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}
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////////////////////////////////////////////////////////////////////////////////
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// AccEvent cycle collection
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NS_IMPL_CYCLE_COLLECTION_CLASS(AccEvent)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(AccEvent)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mAccessible)
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if (AccTreeMutationEvent* tmEvent = downcast_accEvent(tmp)) {
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tmEvent->SetNextEvent(nullptr);
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tmEvent->SetPrevEvent(nullptr);
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}
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(AccEvent)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAccessible)
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if (AccTreeMutationEvent* tmEvent = downcast_accEvent(tmp)) {
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CycleCollectionNoteChild(cb, tmEvent->NextEvent(), "mNext");
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CycleCollectionNoteChild(cb, tmEvent->PrevEvent(), "mPrevEvent");
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}
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(AccEvent, AddRef)
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NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(AccEvent, Release)
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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// AccTextChangeEvent
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////////////////////////////////////////////////////////////////////////////////
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// Note: we pass in eAllowDupes to the base class because we don't support text
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// events coalescence. We fire delayed text change events in DocAccessible but
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// we continue to base the event off the accessible object rather than just the
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// node. This means we won't try to create an accessible based on the node when
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// we are ready to fire the event and so we will no longer assert at that point
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// if the node was removed from the document. Either way, the AT won't work with
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// a defunct accessible so the behaviour should be equivalent.
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AccTextChangeEvent::
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AccTextChangeEvent(Accessible* aAccessible, int32_t aStart,
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const nsAString& aModifiedText, bool aIsInserted,
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EIsFromUserInput aIsFromUserInput)
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: AccEvent(aIsInserted ?
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static_cast<uint32_t>(nsIAccessibleEvent::EVENT_TEXT_INSERTED) :
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static_cast<uint32_t>(nsIAccessibleEvent::EVENT_TEXT_REMOVED),
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aAccessible, aIsFromUserInput, eAllowDupes)
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, mStart(aStart)
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, mIsInserted(aIsInserted)
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, mModifiedText(aModifiedText)
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{
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// XXX We should use IsFromUserInput here, but that isn't always correct
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// when the text change isn't related to content insertion or removal.
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mIsFromUserInput = mAccessible->State() &
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(states::FOCUSED | states::EDITABLE);
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}
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////////////////////////////////////////////////////////////////////////////////
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// AccHideEvent
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////////////////////////////////////////////////////////////////////////////////
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AccHideEvent::
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AccHideEvent(Accessible* aTarget, bool aNeedsShutdown) :
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AccMutationEvent(::nsIAccessibleEvent::EVENT_HIDE, aTarget),
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mNeedsShutdown(aNeedsShutdown)
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{
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mNextSibling = mAccessible->NextSibling();
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mPrevSibling = mAccessible->PrevSibling();
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}
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////////////////////////////////////////////////////////////////////////////////
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// AccShowEvent
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////////////////////////////////////////////////////////////////////////////////
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AccShowEvent::
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AccShowEvent(Accessible* aTarget) :
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AccMutationEvent(::nsIAccessibleEvent::EVENT_SHOW, aTarget)
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{
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int32_t idx = aTarget->IndexInParent();
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MOZ_ASSERT(idx >= 0);
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mInsertionIndex = idx;
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}
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////////////////////////////////////////////////////////////////////////////////
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// AccTextSelChangeEvent
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////////////////////////////////////////////////////////////////////////////////
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AccTextSelChangeEvent::AccTextSelChangeEvent(HyperTextAccessible* aTarget,
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dom::Selection* aSelection,
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int32_t aReason) :
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AccEvent(nsIAccessibleEvent::EVENT_TEXT_SELECTION_CHANGED, aTarget,
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eAutoDetect, eCoalesceTextSelChange),
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mSel(aSelection), mReason(aReason) {}
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AccTextSelChangeEvent::~AccTextSelChangeEvent() { }
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bool
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AccTextSelChangeEvent::IsCaretMoveOnly() const
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{
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return mSel->RangeCount() == 1 && mSel->IsCollapsed() &&
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((mReason & (nsISelectionListener::COLLAPSETOSTART_REASON |
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nsISelectionListener::COLLAPSETOEND_REASON)) == 0);
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}
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////////////////////////////////////////////////////////////////////////////////
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// AccSelChangeEvent
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////////////////////////////////////////////////////////////////////////////////
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AccSelChangeEvent::
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AccSelChangeEvent(Accessible* aWidget, Accessible* aItem,
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SelChangeType aSelChangeType) :
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AccEvent(0, aItem, eAutoDetect, eCoalesceSelectionChange),
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mWidget(aWidget), mItem(aItem), mSelChangeType(aSelChangeType),
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mPreceedingCount(0), mPackedEvent(nullptr)
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{
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if (aSelChangeType == eSelectionAdd) {
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if (mWidget->GetSelectedItem(1))
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mEventType = nsIAccessibleEvent::EVENT_SELECTION_ADD;
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else
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mEventType = nsIAccessibleEvent::EVENT_SELECTION;
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} else {
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mEventType = nsIAccessibleEvent::EVENT_SELECTION_REMOVE;
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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// AccTableChangeEvent
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////////////////////////////////////////////////////////////////////////////////
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AccTableChangeEvent::
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AccTableChangeEvent(Accessible* aAccessible, uint32_t aEventType,
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int32_t aRowOrColIndex, int32_t aNumRowsOrCols) :
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AccEvent(aEventType, aAccessible),
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mRowOrColIndex(aRowOrColIndex), mNumRowsOrCols(aNumRowsOrCols)
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{
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}
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////////////////////////////////////////////////////////////////////////////////
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// AccVCChangeEvent
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////////////////////////////////////////////////////////////////////////////////
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AccVCChangeEvent::
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AccVCChangeEvent(Accessible* aAccessible,
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Accessible* aOldAccessible,
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int32_t aOldStart, int32_t aOldEnd,
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int16_t aReason, EIsFromUserInput aIsFromUserInput) :
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AccEvent(::nsIAccessibleEvent::EVENT_VIRTUALCURSOR_CHANGED, aAccessible,
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aIsFromUserInput),
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mOldAccessible(aOldAccessible), mOldStart(aOldStart), mOldEnd(aOldEnd),
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mReason(aReason)
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{
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}
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already_AddRefed<nsIAccessibleEvent>
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a11y::MakeXPCEvent(AccEvent* aEvent)
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{
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DocAccessible* doc = aEvent->Document();
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Accessible* acc = aEvent->GetAccessible();
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nsINode* node = acc->GetNode();
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nsIDOMNode* domNode = node ? node->AsDOMNode() : nullptr;
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bool fromUser = aEvent->IsFromUserInput();
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uint32_t type = aEvent->GetEventType();
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uint32_t eventGroup = aEvent->GetEventGroups();
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nsCOMPtr<nsIAccessibleEvent> xpEvent;
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if (eventGroup & (1 << AccEvent::eStateChangeEvent)) {
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AccStateChangeEvent* sc = downcast_accEvent(aEvent);
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bool extra = false;
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uint32_t state = nsAccUtils::To32States(sc->GetState(), &extra);
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xpEvent = new xpcAccStateChangeEvent(type, ToXPC(acc), ToXPCDocument(doc),
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domNode, fromUser,
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state, extra, sc->IsStateEnabled());
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return xpEvent.forget();
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}
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if (eventGroup & (1 << AccEvent::eTextChangeEvent)) {
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AccTextChangeEvent* tc = downcast_accEvent(aEvent);
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nsString text;
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tc->GetModifiedText(text);
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xpEvent = new xpcAccTextChangeEvent(type, ToXPC(acc), ToXPCDocument(doc),
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domNode, fromUser,
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tc->GetStartOffset(), tc->GetLength(),
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tc->IsTextInserted(), text);
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return xpEvent.forget();
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}
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if (eventGroup & (1 << AccEvent::eHideEvent)) {
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AccHideEvent* hideEvent = downcast_accEvent(aEvent);
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xpEvent = new xpcAccHideEvent(type, ToXPC(acc), ToXPCDocument(doc),
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domNode, fromUser,
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ToXPC(hideEvent->TargetParent()),
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ToXPC(hideEvent->TargetNextSibling()),
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ToXPC(hideEvent->TargetPrevSibling()));
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return xpEvent.forget();
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}
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if (eventGroup & (1 << AccEvent::eCaretMoveEvent)) {
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AccCaretMoveEvent* cm = downcast_accEvent(aEvent);
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xpEvent = new xpcAccCaretMoveEvent(type, ToXPC(acc), ToXPCDocument(doc),
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domNode, fromUser,
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cm->GetCaretOffset());
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return xpEvent.forget();
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}
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if (eventGroup & (1 << AccEvent::eVirtualCursorChangeEvent)) {
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AccVCChangeEvent* vcc = downcast_accEvent(aEvent);
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xpEvent = new xpcAccVirtualCursorChangeEvent(type,
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ToXPC(acc), ToXPCDocument(doc),
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domNode, fromUser,
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ToXPC(vcc->OldAccessible()),
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vcc->OldStartOffset(),
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vcc->OldEndOffset(),
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vcc->Reason());
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return xpEvent.forget();
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}
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if (eventGroup & (1 << AccEvent::eObjectAttrChangedEvent)) {
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AccObjectAttrChangedEvent* oac = downcast_accEvent(aEvent);
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xpEvent = new xpcAccObjectAttributeChangedEvent(type,
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ToXPC(acc),
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ToXPCDocument(doc), domNode,
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fromUser,
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oac->GetAttribute());
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return xpEvent.forget();
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}
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xpEvent = new xpcAccEvent(type, ToXPC(acc), ToXPCDocument(doc), domNode, fromUser);
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return xpEvent.forget();
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}
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