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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 "xpcAccessibleDocument.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/dom/Selection.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, Accessible* aAccessible,
EIsFromUserInput aIsFromUserInput, EEventRule aEventRule) :
mEventType(aEventType), mEventRule(aEventRule), mAccessible(aAccessible)
{
if (aIsFromUserInput == eAutoDetect)
mIsFromUserInput = EventStateManager::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(Accessible* 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(Accessible* aTarget, bool aNeedsShutdown) :
AccMutationEvent(::nsIAccessibleEvent::EVENT_HIDE, aTarget),
mNeedsShutdown(aNeedsShutdown)
{
mNextSibling = mAccessible->NextSibling();
mPrevSibling = mAccessible->PrevSibling();
}
////////////////////////////////////////////////////////////////////////////////
// AccShowEvent
////////////////////////////////////////////////////////////////////////////////
AccShowEvent::
AccShowEvent(Accessible* 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);
}
////////////////////////////////////////////////////////////////////////////////
// AccSelChangeEvent
////////////////////////////////////////////////////////////////////////////////
AccSelChangeEvent::
AccSelChangeEvent(Accessible* aWidget, Accessible* 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(Accessible* aAccessible, uint32_t aEventType,
int32_t aRowOrColIndex, int32_t aNumRowsOrCols) :
AccEvent(aEventType, aAccessible),
mRowOrColIndex(aRowOrColIndex), mNumRowsOrCols(aNumRowsOrCols)
{
}
////////////////////////////////////////////////////////////////////////////////
// AccVCChangeEvent
////////////////////////////////////////////////////////////////////////////////
AccVCChangeEvent::
AccVCChangeEvent(Accessible* aAccessible,
Accessible* aOldAccessible,
int32_t aOldStart, int32_t aOldEnd,
int16_t aReason, EIsFromUserInput aIsFromUserInput) :
AccEvent(::nsIAccessibleEvent::EVENT_VIRTUALCURSOR_CHANGED, aAccessible,
aIsFromUserInput),
mOldAccessible(aOldAccessible), mOldStart(aOldStart), mOldEnd(aOldEnd),
mReason(aReason)
{
}
already_AddRefed<nsIAccessibleEvent>
a11y::MakeXPCEvent(AccEvent* aEvent)
{
DocAccessible* doc = aEvent->Document();
Accessible* acc = aEvent->GetAccessible();
nsINode* node = acc->GetNode();
nsIDOMNode* domNode = node ? node->AsDOMNode() : nullptr;
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),
domNode, 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),
domNode, 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),
domNode, 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),
domNode, fromUser,
cm->GetCaretOffset());
return xpEvent.forget();
}
if (eventGroup & (1 << AccEvent::eVirtualCursorChangeEvent)) {
AccVCChangeEvent* vcc = downcast_accEvent(aEvent);
xpEvent = new xpcAccVirtualCursorChangeEvent(type,
ToXPC(acc), ToXPCDocument(doc),
domNode, fromUser,
ToXPC(vcc->OldAccessible()),
vcc->OldStartOffset(),
vcc->OldEndOffset(),
vcc->Reason());
return xpEvent.forget();
}
if (eventGroup & (1 << AccEvent::eObjectAttrChangedEvent)) {
AccObjectAttrChangedEvent* oac = downcast_accEvent(aEvent);
xpEvent = new xpcAccObjectAttributeChangedEvent(type,
ToXPC(acc),
ToXPCDocument(doc), domNode,
fromUser,
oac->GetAttribute());
return xpEvent.forget();
}
xpEvent = new xpcAccEvent(type, ToXPC(acc), ToXPCDocument(doc), domNode, fromUser);
return xpEvent.forget();
}
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