зеркало из https://github.com/mozilla/gecko-dev.git
403 строки
12 KiB
C++
403 строки
12 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "EventListenerService.h"
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#include "mozilla/BasicEvents.h"
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#include "mozilla/EventDispatcher.h"
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#include "mozilla/EventListenerManager.h"
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#include "mozilla/JSEventHandler.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/dom/EventListenerBinding.h"
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#include "mozilla/dom/ScriptSettings.h"
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#include "nsArrayUtils.h"
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#include "nsCOMArray.h"
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#include "nsJSUtils.h"
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#include "nsMemory.h"
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#include "nsServiceManagerUtils.h"
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#include "nsArray.h"
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#include "nsThreadUtils.h"
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namespace mozilla {
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using namespace dom;
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/******************************************************************************
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* mozilla::EventListenerChange
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******************************************************************************/
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NS_IMPL_ISUPPORTS(EventListenerChange, nsIEventListenerChange)
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EventListenerChange::~EventListenerChange() = default;
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EventListenerChange::EventListenerChange(EventTarget* aTarget)
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: mTarget(aTarget) {}
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void EventListenerChange::AddChangedListenerName(nsAtom* aEventName) {
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mChangedListenerNames.AppendElement(aEventName);
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}
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NS_IMETHODIMP
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EventListenerChange::GetTarget(EventTarget** aTarget) {
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NS_ENSURE_ARG_POINTER(aTarget);
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NS_ADDREF(*aTarget = mTarget);
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return NS_OK;
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}
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NS_IMETHODIMP
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EventListenerChange::GetCountOfEventListenerChangesAffectingAccessibility(
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uint32_t* aCount) {
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*aCount = 0;
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size_t length = mChangedListenerNames.Length();
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for (size_t i = 0; i < length; i++) {
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RefPtr<nsAtom> listenerName = mChangedListenerNames[i];
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// These are the event listener changes which may make an element
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// accessible or inaccessible.
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if (listenerName == nsGkAtoms::onclick ||
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listenerName == nsGkAtoms::onmousedown ||
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listenerName == nsGkAtoms::onmouseup) {
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*aCount += 1;
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}
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}
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return NS_OK;
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}
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/******************************************************************************
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* mozilla::EventListenerInfo
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******************************************************************************/
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EventListenerInfo::EventListenerInfo(
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const nsAString& aType, JS::Handle<JSObject*> aScriptedListener,
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JS::Handle<JSObject*> aScriptedListenerGlobal, bool aCapturing,
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bool aAllowsUntrusted, bool aInSystemEventGroup)
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: mType(aType),
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mScriptedListener(aScriptedListener),
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mScriptedListenerGlobal(aScriptedListenerGlobal),
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mCapturing(aCapturing),
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mAllowsUntrusted(aAllowsUntrusted),
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mInSystemEventGroup(aInSystemEventGroup) {
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if (aScriptedListener) {
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MOZ_ASSERT(JS_IsGlobalObject(aScriptedListenerGlobal));
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js::AssertSameCompartment(aScriptedListener, aScriptedListenerGlobal);
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}
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HoldJSObjects(this);
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}
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EventListenerInfo::~EventListenerInfo() { DropJSObjects(this); }
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NS_IMPL_CYCLE_COLLECTION_CLASS(EventListenerInfo)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(EventListenerInfo)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(EventListenerInfo)
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tmp->mScriptedListener = nullptr;
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tmp->mScriptedListenerGlobal = nullptr;
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(EventListenerInfo)
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NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mScriptedListener)
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NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mScriptedListenerGlobal)
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NS_IMPL_CYCLE_COLLECTION_TRACE_END
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(EventListenerInfo)
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NS_INTERFACE_MAP_ENTRY(nsIEventListenerInfo)
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NS_INTERFACE_MAP_ENTRY(nsISupports)
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NS_INTERFACE_MAP_END
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NS_IMPL_CYCLE_COLLECTING_ADDREF(EventListenerInfo)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(EventListenerInfo)
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NS_IMETHODIMP
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EventListenerInfo::GetType(nsAString& aType) {
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aType = mType;
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return NS_OK;
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}
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NS_IMETHODIMP
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EventListenerInfo::GetCapturing(bool* aCapturing) {
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*aCapturing = mCapturing;
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return NS_OK;
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}
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NS_IMETHODIMP
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EventListenerInfo::GetAllowsUntrusted(bool* aAllowsUntrusted) {
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*aAllowsUntrusted = mAllowsUntrusted;
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return NS_OK;
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}
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NS_IMETHODIMP
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EventListenerInfo::GetInSystemEventGroup(bool* aInSystemEventGroup) {
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*aInSystemEventGroup = mInSystemEventGroup;
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return NS_OK;
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}
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NS_IMETHODIMP
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EventListenerInfo::GetListenerObject(JSContext* aCx,
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JS::MutableHandle<JS::Value> aObject) {
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Maybe<JSAutoRealm> ar;
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GetJSVal(aCx, ar, aObject);
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return NS_OK;
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}
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/******************************************************************************
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* mozilla::EventListenerService
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******************************************************************************/
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NS_IMPL_ISUPPORTS(EventListenerService, nsIEventListenerService)
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bool EventListenerInfo::GetJSVal(JSContext* aCx, Maybe<JSAutoRealm>& aAr,
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JS::MutableHandle<JS::Value> aJSVal) {
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if (mScriptedListener) {
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aJSVal.setObject(*mScriptedListener);
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aAr.emplace(aCx, mScriptedListenerGlobal);
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return true;
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}
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aJSVal.setNull();
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return false;
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}
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NS_IMETHODIMP
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EventListenerInfo::ToSource(nsAString& aResult) {
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aResult.SetIsVoid(true);
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AutoSafeJSContext cx;
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Maybe<JSAutoRealm> ar;
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JS::Rooted<JS::Value> v(cx);
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if (GetJSVal(cx, ar, &v)) {
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JSString* str = JS_ValueToSource(cx, v);
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if (str) {
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nsAutoJSString autoStr;
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if (autoStr.init(cx, str)) {
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aResult.Assign(autoStr);
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}
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}
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}
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return NS_OK;
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}
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EventListenerService* EventListenerService::sInstance = nullptr;
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EventListenerService::EventListenerService() {
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MOZ_ASSERT(!sInstance);
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sInstance = this;
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}
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EventListenerService::~EventListenerService() {
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MOZ_ASSERT(sInstance == this);
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sInstance = nullptr;
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}
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NS_IMETHODIMP
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EventListenerService::GetListenerInfoFor(
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EventTarget* aEventTarget,
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nsTArray<RefPtr<nsIEventListenerInfo>>& aOutArray) {
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NS_ENSURE_ARG_POINTER(aEventTarget);
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EventListenerManager* elm = aEventTarget->GetExistingListenerManager();
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if (elm) {
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elm->GetListenerInfo(aOutArray);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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EventListenerService::GetEventTargetChainFor(
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EventTarget* aEventTarget, bool aComposed,
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nsTArray<RefPtr<EventTarget>>& aOutArray) {
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NS_ENSURE_ARG(aEventTarget);
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WidgetEvent event(true, eVoidEvent);
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event.SetComposed(aComposed);
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nsTArray<EventTarget*> targets;
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nsresult rv = EventDispatcher::Dispatch(aEventTarget, nullptr, &event,
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nullptr, nullptr, nullptr, &targets);
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NS_ENSURE_SUCCESS(rv, rv);
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aOutArray.AppendElements(targets);
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return NS_OK;
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}
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NS_IMETHODIMP
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EventListenerService::HasListenersFor(EventTarget* aEventTarget,
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const nsAString& aType, bool* aRetVal) {
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NS_ENSURE_TRUE(aEventTarget, NS_ERROR_UNEXPECTED);
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EventListenerManager* elm = aEventTarget->GetExistingListenerManager();
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*aRetVal = elm && elm->HasListenersFor(aType);
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return NS_OK;
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}
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static already_AddRefed<EventListener> ToEventListener(
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JSContext* aCx, JS::Handle<JS::Value> aValue) {
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if (NS_WARN_IF(!aValue.isObject())) {
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return nullptr;
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}
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JS::Rooted<JSObject*> obj(aCx, &aValue.toObject());
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JS::Rooted<JSObject*> global(aCx, JS::CurrentGlobalOrNull(aCx));
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RefPtr<EventListener> listener =
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new EventListener(aCx, obj, global, GetIncumbentGlobal());
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return listener.forget();
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}
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NS_IMETHODIMP
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EventListenerService::AddSystemEventListener(EventTarget* aTarget,
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const nsAString& aType,
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JS::Handle<JS::Value> aListener,
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bool aUseCapture, JSContext* aCx) {
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MOZ_ASSERT(aTarget, "Missing target");
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NS_ENSURE_TRUE(aTarget, NS_ERROR_UNEXPECTED);
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RefPtr<EventListener> listener = ToEventListener(aCx, aListener);
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if (!listener) {
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return NS_ERROR_UNEXPECTED;
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}
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EventListenerManager* manager = aTarget->GetOrCreateListenerManager();
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NS_ENSURE_STATE(manager);
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EventListenerFlags flags = aUseCapture ? TrustedEventsAtSystemGroupCapture()
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: TrustedEventsAtSystemGroupBubble();
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manager->AddEventListenerByType(listener, aType, flags);
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return NS_OK;
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}
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NS_IMETHODIMP
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EventListenerService::RemoveSystemEventListener(EventTarget* aTarget,
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const nsAString& aType,
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JS::Handle<JS::Value> aListener,
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bool aUseCapture,
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JSContext* aCx) {
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MOZ_ASSERT(aTarget, "Missing target");
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NS_ENSURE_TRUE(aTarget, NS_ERROR_UNEXPECTED);
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RefPtr<EventListener> listener = ToEventListener(aCx, aListener);
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if (!listener) {
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return NS_ERROR_UNEXPECTED;
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}
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EventListenerManager* manager = aTarget->GetExistingListenerManager();
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if (manager) {
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EventListenerFlags flags = aUseCapture ? TrustedEventsAtSystemGroupCapture()
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: TrustedEventsAtSystemGroupBubble();
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manager->RemoveEventListenerByType(listener, aType, flags);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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EventListenerService::AddListenerForAllEvents(
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EventTarget* aTarget, JS::Handle<JS::Value> aListener, bool aUseCapture,
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bool aWantsUntrusted, bool aSystemEventGroup, JSContext* aCx) {
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NS_ENSURE_STATE(aTarget);
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RefPtr<EventListener> listener = ToEventListener(aCx, aListener);
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if (!listener) {
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return NS_ERROR_UNEXPECTED;
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}
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EventListenerManager* manager = aTarget->GetOrCreateListenerManager();
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NS_ENSURE_STATE(manager);
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manager->AddListenerForAllEvents(listener, aUseCapture, aWantsUntrusted,
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aSystemEventGroup);
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return NS_OK;
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}
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NS_IMETHODIMP
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EventListenerService::RemoveListenerForAllEvents(
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EventTarget* aTarget, JS::Handle<JS::Value> aListener, bool aUseCapture,
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bool aSystemEventGroup, JSContext* aCx) {
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NS_ENSURE_STATE(aTarget);
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RefPtr<EventListener> listener = ToEventListener(aCx, aListener);
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if (!listener) {
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return NS_ERROR_UNEXPECTED;
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}
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EventListenerManager* manager = aTarget->GetExistingListenerManager();
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if (manager) {
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manager->RemoveListenerForAllEvents(listener, aUseCapture,
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aSystemEventGroup);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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EventListenerService::AddListenerChangeListener(
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nsIListenerChangeListener* aListener) {
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if (!mChangeListeners.Contains(aListener)) {
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mChangeListeners.AppendElement(aListener);
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}
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return NS_OK;
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};
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NS_IMETHODIMP
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EventListenerService::RemoveListenerChangeListener(
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nsIListenerChangeListener* aListener) {
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mChangeListeners.RemoveElement(aListener);
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return NS_OK;
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};
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void EventListenerService::NotifyAboutMainThreadListenerChangeInternal(
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dom::EventTarget* aTarget, nsAtom* aName) {
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MOZ_ASSERT(NS_IsMainThread());
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MOZ_ASSERT(aTarget);
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if (mChangeListeners.IsEmpty()) {
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return;
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}
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if (!mPendingListenerChanges) {
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mPendingListenerChanges = nsArrayBase::Create();
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nsCOMPtr<nsIRunnable> runnable =
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NewRunnableMethod("EventListenerService::NotifyPendingChanges", this,
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&EventListenerService::NotifyPendingChanges);
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if (nsCOMPtr<nsIGlobalObject> global = aTarget->GetOwnerGlobal()) {
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global->Dispatch(TaskCategory::Other, runnable.forget());
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} else if (nsCOMPtr<nsINode> node = do_QueryInterface(aTarget)) {
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node->OwnerDoc()->Dispatch(TaskCategory::Other, runnable.forget());
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} else {
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NS_DispatchToCurrentThread(runnable);
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}
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}
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RefPtr<EventListenerChange> changes =
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mPendingListenerChangesSet.LookupForAdd(aTarget).OrInsert(
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[this, aTarget]() {
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EventListenerChange* c = new EventListenerChange(aTarget);
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mPendingListenerChanges->AppendElement(c);
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return c;
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});
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changes->AddChangedListenerName(aName);
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}
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void EventListenerService::NotifyPendingChanges() {
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nsCOMPtr<nsIMutableArray> changes;
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mPendingListenerChanges.swap(changes);
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mPendingListenerChangesSet.Clear();
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nsTObserverArray<nsCOMPtr<nsIListenerChangeListener>>::EndLimitedIterator
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iter(mChangeListeners);
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while (iter.HasMore()) {
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nsCOMPtr<nsIListenerChangeListener> listener = iter.GetNext();
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listener->ListenersChanged(changes);
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}
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}
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} // namespace mozilla
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nsresult NS_NewEventListenerService(nsIEventListenerService** aResult) {
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*aResult = new mozilla::EventListenerService();
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NS_ADDREF(*aResult);
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return NS_OK;
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}
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