mozilla
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gecko-dev
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gecko-dev/dom/events/EventListenerService.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=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 "EventListenerService.h"
#include "mozilla/BasicEvents.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventListenerManager.h"
#include "mozilla/JSEventHandler.h"
#include "mozilla/Maybe.h"
#include "nsArrayUtils.h"
#include "nsCOMArray.h"
#include "nsDOMClassInfoID.h"
#include "nsIXPConnect.h"
#include "nsJSUtils.h"
#include "nsMemory.h"
#include "nsServiceManagerUtils.h"
#include "nsArray.h"
#include "nsThreadUtils.h"
namespace mozilla {
using namespace dom;
/******************************************************************************
* mozilla::EventListenerChange
******************************************************************************/
NS_IMPL_ISUPPORTS(EventListenerChange, nsIEventListenerChange)
EventListenerChange::~EventListenerChange()
{
}
EventListenerChange::EventListenerChange(dom::EventTarget* aTarget) :
mTarget(aTarget)
{
}
void
EventListenerChange::AddChangedListenerName(nsAtom* aEventName)
{
mChangedListenerNames.AppendElement(aEventName);
}
NS_IMETHODIMP
EventListenerChange::GetTarget(nsIDOMEventTarget** aTarget)
{
NS_ENSURE_ARG_POINTER(aTarget);
NS_ADDREF(*aTarget = mTarget);
return NS_OK;
}
NS_IMETHODIMP
EventListenerChange::GetCountOfEventListenerChangesAffectingAccessibility(
uint32_t* aCount)
{
*aCount = 0;
size_t length = mChangedListenerNames.Length();
for (size_t i = 0; i < length; i++) {
RefPtr<nsAtom> listenerName = mChangedListenerNames[i];
// These are the event listener changes which may make an element
// accessible or inaccessible.
if (listenerName == nsGkAtoms::onclick ||
listenerName == nsGkAtoms::onmousedown ||
listenerName == nsGkAtoms::onmouseup) {
*aCount += 1;
}
}
return NS_OK;
}
/******************************************************************************
* mozilla::EventListenerInfo
******************************************************************************/
NS_IMPL_CYCLE_COLLECTION(EventListenerInfo, mListener)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(EventListenerInfo)
NS_INTERFACE_MAP_ENTRY(nsIEventListenerInfo)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(EventListenerInfo)
NS_IMPL_CYCLE_COLLECTING_RELEASE(EventListenerInfo)
NS_IMETHODIMP
EventListenerInfo::GetType(nsAString& aType)
{
aType = mType;
return NS_OK;
}
NS_IMETHODIMP
EventListenerInfo::GetCapturing(bool* aCapturing)
{
*aCapturing = mCapturing;
return NS_OK;
}
NS_IMETHODIMP
EventListenerInfo::GetAllowsUntrusted(bool* aAllowsUntrusted)
{
*aAllowsUntrusted = mAllowsUntrusted;
return NS_OK;
}
NS_IMETHODIMP
EventListenerInfo::GetInSystemEventGroup(bool* aInSystemEventGroup)
{
*aInSystemEventGroup = mInSystemEventGroup;
return NS_OK;
}
NS_IMETHODIMP
EventListenerInfo::GetListenerObject(JSContext* aCx,
JS::MutableHandle<JS::Value> aObject)
{
Maybe<JSAutoCompartment> ac;
GetJSVal(aCx, ac, aObject);
return NS_OK;
}
/******************************************************************************
* mozilla::EventListenerService
******************************************************************************/
NS_IMPL_ISUPPORTS(EventListenerService, nsIEventListenerService)
bool
EventListenerInfo::GetJSVal(JSContext* aCx,
Maybe<JSAutoCompartment>& aAc,
JS::MutableHandle<JS::Value> aJSVal)
{
aJSVal.setNull();
nsCOMPtr<nsIXPConnectWrappedJS> wrappedJS = do_QueryInterface(mListener);
if (wrappedJS) {
JS::Rooted<JSObject*> object(aCx, wrappedJS->GetJSObject());
if (!object) {
return false;
}
aAc.emplace(aCx, object);
aJSVal.setObject(*object);
return true;
}
nsCOMPtr<JSEventHandler> jsHandler = do_QueryInterface(mListener);
if (jsHandler && jsHandler->GetTypedEventHandler().HasEventHandler()) {
JS::Handle<JSObject*> handler =
jsHandler->GetTypedEventHandler().Ptr()->CallableOrNull();
if (handler) {
aAc.emplace(aCx, handler);
aJSVal.setObject(*handler);
return true;
}
}
return false;
}
NS_IMETHODIMP
EventListenerInfo::ToSource(nsAString& aResult)
{
aResult.SetIsVoid(true);
AutoSafeJSContext cx;
Maybe<JSAutoCompartment> ac;
JS::Rooted<JS::Value> v(cx);
if (GetJSVal(cx, ac, &v)) {
JSString* str = JS_ValueToSource(cx, v);
if (str) {
nsAutoJSString autoStr;
if (autoStr.init(cx, str)) {
aResult.Assign(autoStr);
}
}
}
return NS_OK;
}
EventListenerService*
EventListenerService::sInstance = nullptr;
EventListenerService::EventListenerService()
{
MOZ_ASSERT(!sInstance);
sInstance = this;
}
EventListenerService::~EventListenerService()
{
MOZ_ASSERT(sInstance == this);
sInstance = nullptr;
}
NS_IMETHODIMP
EventListenerService::GetListenerInfoFor(nsIDOMEventTarget* aEventTarget,
uint32_t* aCount,
nsIEventListenerInfo*** aOutArray)
{
NS_ENSURE_ARG_POINTER(aEventTarget);
*aCount = 0;
*aOutArray = nullptr;
nsCOMArray<nsIEventListenerInfo> listenerInfos;
nsCOMPtr<EventTarget> eventTarget = do_QueryInterface(aEventTarget);
NS_ENSURE_TRUE(eventTarget, NS_ERROR_NO_INTERFACE);
EventListenerManager* elm = eventTarget->GetExistingListenerManager();
if (elm) {
elm->GetListenerInfo(&listenerInfos);
}
int32_t count = listenerInfos.Count();
if (count == 0) {
return NS_OK;
}
listenerInfos.Forget(aOutArray);
*aCount = count;
return NS_OK;
}
NS_IMETHODIMP
EventListenerService::GetEventTargetChainFor(nsIDOMEventTarget* aEventTarget,
bool aComposed,
uint32_t* aCount,
nsIDOMEventTarget*** aOutArray)
{
*aCount = 0;
*aOutArray = nullptr;
NS_ENSURE_ARG(aEventTarget);
WidgetEvent event(true, eVoidEvent);
event.SetComposed(aComposed);
nsTArray<EventTarget*> targets;
nsresult rv = EventDispatcher::Dispatch(aEventTarget, nullptr, &event,
nullptr, nullptr, nullptr, &targets);
NS_ENSURE_SUCCESS(rv, rv);
int32_t count = targets.Length();
if (count == 0) {
return NS_OK;
}
*aOutArray =
static_cast<nsIDOMEventTarget**>(
moz_xmalloc(sizeof(nsIDOMEventTarget*) * count));
NS_ENSURE_TRUE(*aOutArray, NS_ERROR_OUT_OF_MEMORY);
for (int32_t i = 0; i < count; ++i) {
NS_ADDREF((*aOutArray)[i] = targets[i]);
}
*aCount = count;
return NS_OK;
}
NS_IMETHODIMP
EventListenerService::HasListenersFor(nsIDOMEventTarget* aEventTarget,
const nsAString& aType,
bool* aRetVal)
{
nsCOMPtr<EventTarget> eventTarget = do_QueryInterface(aEventTarget);
NS_ENSURE_TRUE(eventTarget, NS_ERROR_NO_INTERFACE);
EventListenerManager* elm = eventTarget->GetExistingListenerManager();
*aRetVal = elm && elm->HasListenersFor(aType);
return NS_OK;
}
NS_IMETHODIMP
EventListenerService::AddSystemEventListener(nsIDOMEventTarget *aTarget,
const nsAString& aType,
nsIDOMEventListener* aListener,
bool aUseCapture)
{
NS_PRECONDITION(aTarget, "Missing target");
NS_PRECONDITION(aListener, "Missing listener");
nsCOMPtr<EventTarget> eventTarget = do_QueryInterface(aTarget);
NS_ENSURE_TRUE(eventTarget, NS_ERROR_NO_INTERFACE);
EventListenerManager* manager = eventTarget->GetOrCreateListenerManager();
NS_ENSURE_STATE(manager);
EventListenerFlags flags =
aUseCapture ? TrustedEventsAtSystemGroupCapture() :
TrustedEventsAtSystemGroupBubble();
manager->AddEventListenerByType(aListener, aType, flags);
return NS_OK;
}
NS_IMETHODIMP
EventListenerService::RemoveSystemEventListener(nsIDOMEventTarget *aTarget,
const nsAString& aType,
nsIDOMEventListener* aListener,
bool aUseCapture)
{
NS_PRECONDITION(aTarget, "Missing target");
NS_PRECONDITION(aListener, "Missing listener");
nsCOMPtr<EventTarget> eventTarget = do_QueryInterface(aTarget);
NS_ENSURE_TRUE(eventTarget, NS_ERROR_NO_INTERFACE);
EventListenerManager* manager = eventTarget->GetExistingListenerManager();
if (manager) {
EventListenerFlags flags =
aUseCapture ? TrustedEventsAtSystemGroupCapture() :
TrustedEventsAtSystemGroupBubble();
manager->RemoveEventListenerByType(aListener, aType, flags);
}
return NS_OK;
}
NS_IMETHODIMP
EventListenerService::AddListenerForAllEvents(nsIDOMEventTarget* aTarget,
nsIDOMEventListener* aListener,
bool aUseCapture,
bool aWantsUntrusted,
bool aSystemEventGroup)
{
NS_ENSURE_STATE(aTarget && aListener);
nsCOMPtr<EventTarget> eventTarget = do_QueryInterface(aTarget);
NS_ENSURE_TRUE(eventTarget, NS_ERROR_NO_INTERFACE);
EventListenerManager* manager = eventTarget->GetOrCreateListenerManager();
NS_ENSURE_STATE(manager);
manager->AddListenerForAllEvents(aListener, aUseCapture, aWantsUntrusted,
aSystemEventGroup);
return NS_OK;
}
NS_IMETHODIMP
EventListenerService::RemoveListenerForAllEvents(nsIDOMEventTarget* aTarget,
nsIDOMEventListener* aListener,
bool aUseCapture,
bool aSystemEventGroup)
{
NS_ENSURE_STATE(aTarget && aListener);
nsCOMPtr<EventTarget> eventTarget = do_QueryInterface(aTarget);
NS_ENSURE_TRUE(eventTarget, NS_ERROR_NO_INTERFACE);
EventListenerManager* manager = eventTarget->GetExistingListenerManager();
if (manager) {
manager->RemoveListenerForAllEvents(aListener, aUseCapture, aSystemEventGroup);
}
return NS_OK;
}
NS_IMETHODIMP
EventListenerService::AddListenerChangeListener(nsIListenerChangeListener* aListener)
{
if (!mChangeListeners.Contains(aListener)) {
mChangeListeners.AppendElement(aListener);
}
return NS_OK;
};
NS_IMETHODIMP
EventListenerService::RemoveListenerChangeListener(nsIListenerChangeListener* aListener)
{
mChangeListeners.RemoveElement(aListener);
return NS_OK;
};
void
EventListenerService::NotifyAboutMainThreadListenerChangeInternal(dom::EventTarget* aTarget,
nsAtom* aName)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aTarget);
if (mChangeListeners.IsEmpty()) {
return;
}
if (!mPendingListenerChanges) {
mPendingListenerChanges = nsArrayBase::Create();
nsCOMPtr<nsIRunnable> runnable =
NewRunnableMethod("EventListenerService::NotifyPendingChanges",
this, &EventListenerService::NotifyPendingChanges);
if (nsCOMPtr<nsIGlobalObject> global = aTarget->GetOwnerGlobal()) {
global->Dispatch(TaskCategory::Other, runnable.forget());
} else if (nsCOMPtr<nsINode> node = do_QueryInterface(aTarget)) {
node->OwnerDoc()->Dispatch(TaskCategory::Other, runnable.forget());
} else {
NS_DispatchToCurrentThread(runnable);
}
}
RefPtr<EventListenerChange> changes =
mPendingListenerChangesSet.LookupForAdd(aTarget).OrInsert(
[this, aTarget] () {
EventListenerChange* c = new EventListenerChange(aTarget);
mPendingListenerChanges->AppendElement(c, false);
return c;
});
changes->AddChangedListenerName(aName);
}
void
EventListenerService::NotifyPendingChanges()
{
nsCOMPtr<nsIMutableArray> changes;
mPendingListenerChanges.swap(changes);
mPendingListenerChangesSet.Clear();
nsTObserverArray<nsCOMPtr<nsIListenerChangeListener>>::EndLimitedIterator
iter(mChangeListeners);
while (iter.HasMore()) {
nsCOMPtr<nsIListenerChangeListener> listener = iter.GetNext();
listener->ListenersChanged(changes);
}
}
} // namespace mozilla
nsresult
NS_NewEventListenerService(nsIEventListenerService** aResult)
{
*aResult = new mozilla::EventListenerService();
NS_ADDREF(*aResult);
return NS_OK;
}
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