bool
nsCoreUtils::HasClickListener(nsIContent *aContent)
{
NS_ENSURE_TRUE(aContent, false);
EventListenerManager* listenerManager =
aContent->GetExistingListenerManager();
return listenerManager &&
(listenerManager->HasListenersFor(nsGkAtoms::onclick) ||
listenerManager->HasListenersFor(nsGkAtoms::onmousedown) ||
listenerManager->HasListenersFor(nsGkAtoms::onmouseup));
}
NS_IMETHODIMP
EventListenerService::HasListenersFor(EventTarget* aEventTarget,
const nsAString& aType,
bool* aRetVal)
{
NS_ENSURE_TRUE(aEventTarget, NS_ERROR_UNEXPECTED);
EventListenerManager* elm = aEventTarget->GetExistingListenerManager();
*aRetVal = elm && elm->HasListenersFor(aType);
return NS_OK;
}
static bool
HasTouchListener(nsIContent* aContent)
{
EventListenerManager* elm = aContent->GetExistingListenerManager();
if (!elm) {
return false;
}
if (!gTouchEventsRegistered) {
Preferences::AddIntVarCache(&gTouchEventsEnabled,
"dom.w3c_touch_events.enabled", gTouchEventsEnabled);
gTouchEventsRegistered = true;
}
if (!gTouchEventsEnabled) {
return false;
}
return elm->HasListenersFor(nsGkAtoms::ontouchstart) ||
elm->HasListenersFor(nsGkAtoms::ontouchend);
}
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;
}
