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gecko-dev
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gecko-dev/accessible/base/AccEvent.cpp

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C++
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "AccEvent.h"
#include "nsAccUtils.h"
#include "DocAccessible.h"
#include "xpcAccEvents.h"
#include "States.h"
#include "TextRange.h"
#include "xpcAccessibleDocument.h"
#include "xpcAccessibleTextRange.h"
#include "mozilla/dom/Selection.h"
#include "mozilla/dom/UserActivation.h"
#include "nsComponentManagerUtils.h"
#include "nsIMutableArray.h"
using namespace mozilla;
using namespace mozilla::a11y;
static_assert(static_cast<bool>(eNoUserInput) == false &&
static_cast<bool>(eFromUserInput) == true,
"EIsFromUserInput cannot be casted to bool");
////////////////////////////////////////////////////////////////////////////////
// AccEvent
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
// AccEvent constructors
AccEvent::AccEvent(uint32_t aEventType, LocalAccessible* aAccessible,
EIsFromUserInput aIsFromUserInput, EEventRule aEventRule)
: mEventType(aEventType), mEventRule(aEventRule), mAccessible(aAccessible) {
if (aIsFromUserInput == eAutoDetect) {
mIsFromUserInput = dom::UserActivation::IsHandlingUserInput();
} else {
mIsFromUserInput = aIsFromUserInput == eFromUserInput ? true : false;
}
}
////////////////////////////////////////////////////////////////////////////////
// AccEvent cycle collection
NS_IMPL_CYCLE_COLLECTION_CLASS(AccEvent)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(AccEvent)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mAccessible)
if (AccTreeMutationEvent* tmEvent = downcast_accEvent(tmp)) {
tmEvent->SetNextEvent(nullptr);
tmEvent->SetPrevEvent(nullptr);
}
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(AccEvent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAccessible)
if (AccTreeMutationEvent* tmEvent = downcast_accEvent(tmp)) {
CycleCollectionNoteChild(cb, tmEvent->NextEvent(), "mNext");
CycleCollectionNoteChild(cb, tmEvent->PrevEvent(), "mPrevEvent");
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(AccEvent, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(AccEvent, Release)
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
// AccTextChangeEvent
////////////////////////////////////////////////////////////////////////////////
// Note: we pass in eAllowDupes to the base class because we don't support text
// events coalescence. We fire delayed text change events in DocAccessible but
// we continue to base the event off the accessible object rather than just the
// node. This means we won't try to create an accessible based on the node when
// we are ready to fire the event and so we will no longer assert at that point
// if the node was removed from the document. Either way, the AT won't work with
// a defunct accessible so the behaviour should be equivalent.
AccTextChangeEvent::AccTextChangeEvent(LocalAccessible* aAccessible,
int32_t aStart,
const nsAString& aModifiedText,
bool aIsInserted,
EIsFromUserInput aIsFromUserInput)
: AccEvent(
aIsInserted
? static_cast<uint32_t>(nsIAccessibleEvent::EVENT_TEXT_INSERTED)
: static_cast<uint32_t>(nsIAccessibleEvent::EVENT_TEXT_REMOVED),
aAccessible, aIsFromUserInput, eAllowDupes),
mStart(aStart),
mIsInserted(aIsInserted),
mModifiedText(aModifiedText) {
// XXX We should use IsFromUserInput here, but that isn't always correct
// when the text change isn't related to content insertion or removal.
mIsFromUserInput =
mAccessible->State() & (states::FOCUSED | states::EDITABLE);
}
////////////////////////////////////////////////////////////////////////////////
// AccHideEvent
////////////////////////////////////////////////////////////////////////////////
AccHideEvent::AccHideEvent(LocalAccessible* aTarget, bool aNeedsShutdown)
: AccMutationEvent(::nsIAccessibleEvent::EVENT_HIDE, aTarget),
mNeedsShutdown(aNeedsShutdown) {
mNextSibling = mAccessible->LocalNextSibling();
mPrevSibling = mAccessible->LocalPrevSibling();
}
////////////////////////////////////////////////////////////////////////////////
// AccShowEvent
////////////////////////////////////////////////////////////////////////////////
AccShowEvent::AccShowEvent(LocalAccessible* aTarget)
: AccMutationEvent(::nsIAccessibleEvent::EVENT_SHOW, aTarget) {
int32_t idx = aTarget->IndexInParent();
MOZ_ASSERT(idx >= 0);
mInsertionIndex = idx;
}
////////////////////////////////////////////////////////////////////////////////
// AccTextSelChangeEvent
////////////////////////////////////////////////////////////////////////////////
AccTextSelChangeEvent::AccTextSelChangeEvent(HyperTextAccessible* aTarget,
dom::Selection* aSelection,
int32_t aReason)
: AccEvent(nsIAccessibleEvent::EVENT_TEXT_SELECTION_CHANGED, aTarget,
eAutoDetect, eCoalesceTextSelChange),
mSel(aSelection),
mReason(aReason) {}
AccTextSelChangeEvent::~AccTextSelChangeEvent() {}
bool AccTextSelChangeEvent::IsCaretMoveOnly() const {
return mSel->RangeCount() == 1 && mSel->IsCollapsed() &&
((mReason & (nsISelectionListener::COLLAPSETOSTART_REASON |
nsISelectionListener::COLLAPSETOEND_REASON)) == 0);
}
void AccTextSelChangeEvent::SelectionRanges(
nsTArray<TextRange>* aRanges) const {
TextRange::TextRangesFromSelection(mSel, aRanges);
}
////////////////////////////////////////////////////////////////////////////////
// AccSelChangeEvent
////////////////////////////////////////////////////////////////////////////////
AccSelChangeEvent::AccSelChangeEvent(LocalAccessible* aWidget,
LocalAccessible* aItem,
SelChangeType aSelChangeType)
: AccEvent(0, aItem, eAutoDetect, eCoalesceSelectionChange),
mWidget(aWidget),
mItem(aItem),
mSelChangeType(aSelChangeType),
mPreceedingCount(0),
mPackedEvent(nullptr) {
if (aSelChangeType == eSelectionAdd) {
if (mWidget->GetSelectedItem(1)) {
mEventType = nsIAccessibleEvent::EVENT_SELECTION_ADD;
} else {
mEventType = nsIAccessibleEvent::EVENT_SELECTION;
}
} else {
mEventType = nsIAccessibleEvent::EVENT_SELECTION_REMOVE;
}
}
////////////////////////////////////////////////////////////////////////////////
// AccTableChangeEvent
////////////////////////////////////////////////////////////////////////////////
AccTableChangeEvent::AccTableChangeEvent(LocalAccessible* aAccessible,
uint32_t aEventType,
int32_t aRowOrColIndex,
int32_t aNumRowsOrCols)
: AccEvent(aEventType, aAccessible),
mRowOrColIndex(aRowOrColIndex),
mNumRowsOrCols(aNumRowsOrCols) {}
////////////////////////////////////////////////////////////////////////////////
// AccVCChangeEvent
////////////////////////////////////////////////////////////////////////////////
AccVCChangeEvent::AccVCChangeEvent(LocalAccessible* aAccessible,
LocalAccessible* aOldAccessible,
int32_t aOldStart, int32_t aOldEnd,
LocalAccessible* aNewAccessible,
int32_t aNewStart, int32_t aNewEnd,
int16_t aReason, int16_t aBoundaryType,
EIsFromUserInput aIsFromUserInput)
: AccEvent(::nsIAccessibleEvent::EVENT_VIRTUALCURSOR_CHANGED, aAccessible,
aIsFromUserInput),
mOldAccessible(aOldAccessible),
mNewAccessible(aNewAccessible),
mOldStart(aOldStart),
mNewStart(aNewStart),
mOldEnd(aOldEnd),
mNewEnd(aNewEnd),
mReason(aReason),
mBoundaryType(aBoundaryType) {}
already_AddRefed<nsIAccessibleEvent> a11y::MakeXPCEvent(AccEvent* aEvent) {
DocAccessible* doc = aEvent->Document();
LocalAccessible* acc = aEvent->GetAccessible();
nsINode* node = acc->GetNode();
bool fromUser = aEvent->IsFromUserInput();
uint32_t type = aEvent->GetEventType();
uint32_t eventGroup = aEvent->GetEventGroups();
nsCOMPtr<nsIAccessibleEvent> xpEvent;
if (eventGroup & (1 << AccEvent::eStateChangeEvent)) {
AccStateChangeEvent* sc = downcast_accEvent(aEvent);
bool extra = false;
uint32_t state = nsAccUtils::To32States(sc->GetState(), &extra);
xpEvent = new xpcAccStateChangeEvent(type, ToXPC(acc), ToXPCDocument(doc),
node, fromUser, state, extra,
sc->IsStateEnabled());
return xpEvent.forget();
}
if (eventGroup & (1 << AccEvent::eTextChangeEvent)) {
AccTextChangeEvent* tc = downcast_accEvent(aEvent);
nsString text;
tc->GetModifiedText(text);
xpEvent = new xpcAccTextChangeEvent(
type, ToXPC(acc), ToXPCDocument(doc), node, fromUser,
tc->GetStartOffset(), tc->GetLength(), tc->IsTextInserted(), text);
return xpEvent.forget();
}
if (eventGroup & (1 << AccEvent::eHideEvent)) {
AccHideEvent* hideEvent = downcast_accEvent(aEvent);
xpEvent = new xpcAccHideEvent(type, ToXPC(acc), ToXPCDocument(doc), node,
fromUser, ToXPC(hideEvent->TargetParent()),
ToXPC(hideEvent->TargetNextSibling()),
ToXPC(hideEvent->TargetPrevSibling()));
return xpEvent.forget();
}
if (eventGroup & (1 << AccEvent::eCaretMoveEvent)) {
AccCaretMoveEvent* cm = downcast_accEvent(aEvent);
xpEvent = new xpcAccCaretMoveEvent(type, ToXPC(acc), ToXPCDocument(doc),
node, fromUser, cm->GetCaretOffset(),
cm->IsSelectionCollapsed());
return xpEvent.forget();
}
if (eventGroup & (1 << AccEvent::eTextSelChangeEvent)) {
AccTextSelChangeEvent* tsc = downcast_accEvent(aEvent);
AutoTArray<TextRange, 1> ranges;
tsc->SelectionRanges(&ranges);
nsCOMPtr<nsIMutableArray> xpcRanges =
do_CreateInstance(NS_ARRAY_CONTRACTID);
uint32_t len = ranges.Length();
for (uint32_t idx = 0; idx < len; idx++) {
xpcRanges->AppendElement(
new xpcAccessibleTextRange(std::move(ranges[idx])));
}
xpEvent = new xpcAccTextSelectionChangeEvent(
type, ToXPC(acc), ToXPCDocument(doc), node, fromUser, xpcRanges);
return xpEvent.forget();
}
if (eventGroup & (1 << AccEvent::eVirtualCursorChangeEvent)) {
AccVCChangeEvent* vcc = downcast_accEvent(aEvent);
xpEvent = new xpcAccVirtualCursorChangeEvent(
type, ToXPC(acc), ToXPCDocument(doc), node, fromUser,
ToXPC(vcc->OldAccessible()), vcc->OldStartOffset(), vcc->OldEndOffset(),
ToXPC(vcc->NewAccessible()), vcc->NewStartOffset(), vcc->NewEndOffset(),
vcc->Reason(), vcc->BoundaryType());
return xpEvent.forget();
}
if (eventGroup & (1 << AccEvent::eObjectAttrChangedEvent)) {
AccObjectAttrChangedEvent* oac = downcast_accEvent(aEvent);
nsString attribute;
oac->GetAttribute()->ToString(attribute);
xpEvent = new xpcAccObjectAttributeChangedEvent(
type, ToXPC(acc), ToXPCDocument(doc), node, fromUser, attribute);
return xpEvent.forget();
}
if (eventGroup & (1 << AccEvent::eScrollingEvent)) {
AccScrollingEvent* sa = downcast_accEvent(aEvent);
xpEvent = new xpcAccScrollingEvent(
type, ToXPC(acc), ToXPCDocument(doc), node, fromUser, sa->ScrollX(),
sa->ScrollY(), sa->MaxScrollX(), sa->MaxScrollY());
return xpEvent.forget();
}
if (eventGroup & (1 << AccEvent::eAnnouncementEvent)) {
AccAnnouncementEvent* aa = downcast_accEvent(aEvent);
xpEvent = new xpcAccAnnouncementEvent(type, ToXPC(acc), ToXPCDocument(doc),
node, fromUser, aa->Announcement(),
aa->Priority());
return xpEvent.forget();
}
xpEvent =
new xpcAccEvent(type, ToXPC(acc), ToXPCDocument(doc), node, fromUser);
return xpEvent.forget();
}
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