863 lines
23 KiB
JavaScript
863 lines
23 KiB
JavaScript
/**
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* @author Toru Nagashima <https://github.com/mysticatea>
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* @copyright 2015 Toru Nagashima. All rights reserved.
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* See LICENSE file in root directory for full license.
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*/
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/**
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* @typedef {object} PrivateData
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* @property {EventTarget} eventTarget The event target.
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* @property {{type:string}} event The original event object.
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* @property {number} eventPhase The current event phase.
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* @property {EventTarget|null} currentTarget The current event target.
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* @property {boolean} canceled The flag to prevent default.
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* @property {boolean} stopped The flag to stop propagation.
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* @property {boolean} immediateStopped The flag to stop propagation immediately.
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* @property {Function|null} passiveListener The listener if the current listener is passive. Otherwise this is null.
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* @property {number} timeStamp The unix time.
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* @private
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*/
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/**
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* Private data for event wrappers.
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* @type {WeakMap<Event, PrivateData>}
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* @private
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*/
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const privateData = new WeakMap();
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/**
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* Cache for wrapper classes.
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* @type {WeakMap<Object, Function>}
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* @private
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*/
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const wrappers = new WeakMap();
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/**
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* Get private data.
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* @param {Event} event The event object to get private data.
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* @returns {PrivateData} The private data of the event.
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* @private
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*/
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function pd(event) {
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const retv = privateData.get(event);
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console.assert(
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retv != null,
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"'this' is expected an Event object, but got",
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event
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);
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return retv
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}
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/**
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* https://dom.spec.whatwg.org/#set-the-canceled-flag
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* @param data {PrivateData} private data.
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*/
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function setCancelFlag(data) {
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if (data.passiveListener != null) {
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if (
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typeof console !== "undefined" &&
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typeof console.error === "function"
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) {
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console.error(
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"Unable to preventDefault inside passive event listener invocation.",
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data.passiveListener
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);
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}
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return
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}
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if (!data.event.cancelable) {
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return
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}
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data.canceled = true;
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if (typeof data.event.preventDefault === "function") {
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data.event.preventDefault();
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}
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}
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/**
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* @see https://dom.spec.whatwg.org/#interface-event
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* @private
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*/
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/**
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* The event wrapper.
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* @constructor
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* @param {EventTarget} eventTarget The event target of this dispatching.
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* @param {Event|{type:string}} event The original event to wrap.
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*/
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function Event(eventTarget, event) {
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privateData.set(this, {
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eventTarget,
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event,
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eventPhase: 2,
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currentTarget: eventTarget,
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canceled: false,
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stopped: false,
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immediateStopped: false,
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passiveListener: null,
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timeStamp: event.timeStamp || Date.now(),
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});
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// https://heycam.github.io/webidl/#Unforgeable
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Object.defineProperty(this, "isTrusted", { value: false, enumerable: true });
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// Define accessors
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const keys = Object.keys(event);
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for (let i = 0; i < keys.length; ++i) {
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const key = keys[i];
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if (!(key in this)) {
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Object.defineProperty(this, key, defineRedirectDescriptor(key));
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}
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}
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}
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// Should be enumerable, but class methods are not enumerable.
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Event.prototype = {
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/**
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* The type of this event.
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* @type {string}
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*/
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get type() {
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return pd(this).event.type
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},
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/**
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* The target of this event.
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* @type {EventTarget}
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*/
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get target() {
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return pd(this).eventTarget
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},
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/**
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* The target of this event.
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* @type {EventTarget}
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*/
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get currentTarget() {
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return pd(this).currentTarget
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},
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/**
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* @returns {EventTarget[]} The composed path of this event.
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*/
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composedPath() {
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const currentTarget = pd(this).currentTarget;
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if (currentTarget == null) {
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return []
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}
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return [currentTarget]
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},
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/**
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* Constant of NONE.
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* @type {number}
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*/
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get NONE() {
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return 0
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},
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/**
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* Constant of CAPTURING_PHASE.
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* @type {number}
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*/
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get CAPTURING_PHASE() {
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return 1
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},
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/**
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* Constant of AT_TARGET.
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* @type {number}
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*/
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get AT_TARGET() {
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return 2
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},
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/**
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* Constant of BUBBLING_PHASE.
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* @type {number}
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*/
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get BUBBLING_PHASE() {
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return 3
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},
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/**
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* The target of this event.
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* @type {number}
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*/
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get eventPhase() {
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return pd(this).eventPhase
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},
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/**
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* Stop event bubbling.
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* @returns {void}
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*/
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stopPropagation() {
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const data = pd(this);
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data.stopped = true;
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if (typeof data.event.stopPropagation === "function") {
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data.event.stopPropagation();
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}
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},
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/**
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* Stop event bubbling.
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* @returns {void}
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*/
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stopImmediatePropagation() {
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const data = pd(this);
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data.stopped = true;
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data.immediateStopped = true;
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if (typeof data.event.stopImmediatePropagation === "function") {
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data.event.stopImmediatePropagation();
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}
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},
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/**
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* The flag to be bubbling.
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* @type {boolean}
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*/
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get bubbles() {
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return Boolean(pd(this).event.bubbles)
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},
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/**
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* The flag to be cancelable.
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* @type {boolean}
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*/
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get cancelable() {
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return Boolean(pd(this).event.cancelable)
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},
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/**
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* Cancel this event.
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* @returns {void}
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*/
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preventDefault() {
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setCancelFlag(pd(this));
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},
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/**
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* The flag to indicate cancellation state.
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* @type {boolean}
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*/
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get defaultPrevented() {
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return pd(this).canceled
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},
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/**
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* The flag to be composed.
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* @type {boolean}
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*/
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get composed() {
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return Boolean(pd(this).event.composed)
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},
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/**
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* The unix time of this event.
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* @type {number}
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*/
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get timeStamp() {
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return pd(this).timeStamp
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},
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/**
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* The target of this event.
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* @type {EventTarget}
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* @deprecated
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*/
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get srcElement() {
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return pd(this).eventTarget
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},
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/**
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* The flag to stop event bubbling.
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* @type {boolean}
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* @deprecated
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*/
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get cancelBubble() {
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return pd(this).stopped
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},
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set cancelBubble(value) {
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if (!value) {
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return
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}
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const data = pd(this);
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data.stopped = true;
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if (typeof data.event.cancelBubble === "boolean") {
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data.event.cancelBubble = true;
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}
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},
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/**
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* The flag to indicate cancellation state.
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* @type {boolean}
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* @deprecated
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*/
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get returnValue() {
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return !pd(this).canceled
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},
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set returnValue(value) {
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if (!value) {
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setCancelFlag(pd(this));
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}
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},
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/**
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* Initialize this event object. But do nothing under event dispatching.
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* @param {string} type The event type.
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* @param {boolean} [bubbles=false] The flag to be possible to bubble up.
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* @param {boolean} [cancelable=false] The flag to be possible to cancel.
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* @deprecated
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*/
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initEvent() {
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// Do nothing.
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},
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};
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// `constructor` is not enumerable.
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Object.defineProperty(Event.prototype, "constructor", {
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value: Event,
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configurable: true,
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writable: true,
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});
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// Ensure `event instanceof window.Event` is `true`.
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if (typeof window !== "undefined" && typeof window.Event !== "undefined") {
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Object.setPrototypeOf(Event.prototype, window.Event.prototype);
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// Make association for wrappers.
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wrappers.set(window.Event.prototype, Event);
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}
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/**
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* Get the property descriptor to redirect a given property.
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* @param {string} key Property name to define property descriptor.
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* @returns {PropertyDescriptor} The property descriptor to redirect the property.
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* @private
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*/
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function defineRedirectDescriptor(key) {
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return {
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get() {
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return pd(this).event[key]
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},
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set(value) {
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pd(this).event[key] = value;
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},
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configurable: true,
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enumerable: true,
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}
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}
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/**
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* Get the property descriptor to call a given method property.
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* @param {string} key Property name to define property descriptor.
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* @returns {PropertyDescriptor} The property descriptor to call the method property.
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* @private
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*/
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function defineCallDescriptor(key) {
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return {
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value() {
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const event = pd(this).event;
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return event[key].apply(event, arguments)
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},
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configurable: true,
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enumerable: true,
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}
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}
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/**
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* Define new wrapper class.
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* @param {Function} BaseEvent The base wrapper class.
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* @param {Object} proto The prototype of the original event.
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* @returns {Function} The defined wrapper class.
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* @private
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*/
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function defineWrapper(BaseEvent, proto) {
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const keys = Object.keys(proto);
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if (keys.length === 0) {
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return BaseEvent
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}
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/** CustomEvent */
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function CustomEvent(eventTarget, event) {
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BaseEvent.call(this, eventTarget, event);
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}
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CustomEvent.prototype = Object.create(BaseEvent.prototype, {
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constructor: { value: CustomEvent, configurable: true, writable: true },
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});
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// Define accessors.
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for (let i = 0; i < keys.length; ++i) {
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const key = keys[i];
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if (!(key in BaseEvent.prototype)) {
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const descriptor = Object.getOwnPropertyDescriptor(proto, key);
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const isFunc = typeof descriptor.value === "function";
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Object.defineProperty(
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CustomEvent.prototype,
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key,
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isFunc
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? defineCallDescriptor(key)
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: defineRedirectDescriptor(key)
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);
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}
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}
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return CustomEvent
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}
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/**
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* Get the wrapper class of a given prototype.
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* @param {Object} proto The prototype of the original event to get its wrapper.
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* @returns {Function} The wrapper class.
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* @private
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*/
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function getWrapper(proto) {
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if (proto == null || proto === Object.prototype) {
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return Event
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}
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let wrapper = wrappers.get(proto);
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if (wrapper == null) {
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wrapper = defineWrapper(getWrapper(Object.getPrototypeOf(proto)), proto);
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wrappers.set(proto, wrapper);
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}
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return wrapper
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}
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/**
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* Wrap a given event to management a dispatching.
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* @param {EventTarget} eventTarget The event target of this dispatching.
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* @param {Object} event The event to wrap.
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* @returns {Event} The wrapper instance.
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* @private
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*/
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function wrapEvent(eventTarget, event) {
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const Wrapper = getWrapper(Object.getPrototypeOf(event));
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return new Wrapper(eventTarget, event)
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}
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/**
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* Get the immediateStopped flag of a given event.
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* @param {Event} event The event to get.
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* @returns {boolean} The flag to stop propagation immediately.
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* @private
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*/
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function isStopped(event) {
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return pd(event).immediateStopped
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}
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/**
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* Set the current event phase of a given event.
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* @param {Event} event The event to set current target.
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* @param {number} eventPhase New event phase.
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* @returns {void}
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* @private
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*/
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function setEventPhase(event, eventPhase) {
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pd(event).eventPhase = eventPhase;
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}
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/**
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* Set the current target of a given event.
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* @param {Event} event The event to set current target.
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* @param {EventTarget|null} currentTarget New current target.
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* @returns {void}
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* @private
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*/
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function setCurrentTarget(event, currentTarget) {
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pd(event).currentTarget = currentTarget;
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}
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/**
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* Set a passive listener of a given event.
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* @param {Event} event The event to set current target.
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* @param {Function|null} passiveListener New passive listener.
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* @returns {void}
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* @private
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*/
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function setPassiveListener(event, passiveListener) {
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pd(event).passiveListener = passiveListener;
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}
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/**
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* @typedef {object} ListenerNode
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* @property {Function} listener
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* @property {1|2|3} listenerType
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* @property {boolean} passive
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* @property {boolean} once
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* @property {ListenerNode|null} next
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* @private
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*/
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/**
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* @type {WeakMap<object, Map<string, ListenerNode>>}
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* @private
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*/
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const listenersMap = new WeakMap();
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// Listener types
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const CAPTURE = 1;
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const BUBBLE = 2;
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const ATTRIBUTE = 3;
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/**
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* Check whether a given value is an object or not.
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* @param {any} x The value to check.
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* @returns {boolean} `true` if the value is an object.
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*/
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function isObject(x) {
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return x !== null && typeof x === "object" //eslint-disable-line no-restricted-syntax
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}
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/**
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* Get listeners.
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* @param {EventTarget} eventTarget The event target to get.
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* @returns {Map<string, ListenerNode>} The listeners.
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* @private
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*/
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function getListeners(eventTarget) {
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const listeners = listenersMap.get(eventTarget);
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if (listeners == null) {
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throw new TypeError(
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"'this' is expected an EventTarget object, but got another value."
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)
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}
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return listeners
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}
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/**
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* Get the property descriptor for the event attribute of a given event.
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* @param {string} eventName The event name to get property descriptor.
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* @returns {PropertyDescriptor} The property descriptor.
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* @private
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*/
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function defineEventAttributeDescriptor(eventName) {
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return {
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get() {
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const listeners = getListeners(this);
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let node = listeners.get(eventName);
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while (node != null) {
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if (node.listenerType === ATTRIBUTE) {
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return node.listener
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}
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node = node.next;
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}
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return null
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},
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set(listener) {
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if (typeof listener !== "function" && !isObject(listener)) {
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listener = null; // eslint-disable-line no-param-reassign
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}
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const listeners = getListeners(this);
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// Traverse to the tail while removing old value.
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let prev = null;
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let node = listeners.get(eventName);
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while (node != null) {
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if (node.listenerType === ATTRIBUTE) {
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// Remove old value.
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if (prev !== null) {
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prev.next = node.next;
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} else if (node.next !== null) {
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listeners.set(eventName, node.next);
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} else {
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listeners.delete(eventName);
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}
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} else {
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prev = node;
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}
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node = node.next;
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}
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// Add new value.
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if (listener !== null) {
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const newNode = {
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listener,
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listenerType: ATTRIBUTE,
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passive: false,
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once: false,
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next: null,
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};
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if (prev === null) {
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listeners.set(eventName, newNode);
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} else {
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prev.next = newNode;
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}
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}
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},
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configurable: true,
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enumerable: true,
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}
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}
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/**
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* Define an event attribute (e.g. `eventTarget.onclick`).
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* @param {Object} eventTargetPrototype The event target prototype to define an event attrbite.
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* @param {string} eventName The event name to define.
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* @returns {void}
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*/
|
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function defineEventAttribute(eventTargetPrototype, eventName) {
|
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Object.defineProperty(
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eventTargetPrototype,
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`on${eventName}`,
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defineEventAttributeDescriptor(eventName)
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);
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}
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/**
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* Define a custom EventTarget with event attributes.
|
|
* @param {string[]} eventNames Event names for event attributes.
|
|
* @returns {EventTarget} The custom EventTarget.
|
|
* @private
|
|
*/
|
|
function defineCustomEventTarget(eventNames) {
|
|
/** CustomEventTarget */
|
|
function CustomEventTarget() {
|
|
EventTarget.call(this);
|
|
}
|
|
|
|
CustomEventTarget.prototype = Object.create(EventTarget.prototype, {
|
|
constructor: {
|
|
value: CustomEventTarget,
|
|
configurable: true,
|
|
writable: true,
|
|
},
|
|
});
|
|
|
|
for (let i = 0; i < eventNames.length; ++i) {
|
|
defineEventAttribute(CustomEventTarget.prototype, eventNames[i]);
|
|
}
|
|
|
|
return CustomEventTarget
|
|
}
|
|
|
|
/**
|
|
* EventTarget.
|
|
*
|
|
* - This is constructor if no arguments.
|
|
* - This is a function which returns a CustomEventTarget constructor if there are arguments.
|
|
*
|
|
* For example:
|
|
*
|
|
* class A extends EventTarget {}
|
|
* class B extends EventTarget("message") {}
|
|
* class C extends EventTarget("message", "error") {}
|
|
* class D extends EventTarget(["message", "error"]) {}
|
|
*/
|
|
function EventTarget() {
|
|
/*eslint-disable consistent-return */
|
|
if (this instanceof EventTarget) {
|
|
listenersMap.set(this, new Map());
|
|
return
|
|
}
|
|
if (arguments.length === 1 && Array.isArray(arguments[0])) {
|
|
return defineCustomEventTarget(arguments[0])
|
|
}
|
|
if (arguments.length > 0) {
|
|
const types = new Array(arguments.length);
|
|
for (let i = 0; i < arguments.length; ++i) {
|
|
types[i] = arguments[i];
|
|
}
|
|
return defineCustomEventTarget(types)
|
|
}
|
|
throw new TypeError("Cannot call a class as a function")
|
|
/*eslint-enable consistent-return */
|
|
}
|
|
|
|
// Should be enumerable, but class methods are not enumerable.
|
|
EventTarget.prototype = {
|
|
/**
|
|
* Add a given listener to this event target.
|
|
* @param {string} eventName The event name to add.
|
|
* @param {Function} listener The listener to add.
|
|
* @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener.
|
|
* @returns {void}
|
|
*/
|
|
addEventListener(eventName, listener, options) {
|
|
if (listener == null) {
|
|
return
|
|
}
|
|
if (typeof listener !== "function" && !isObject(listener)) {
|
|
throw new TypeError("'listener' should be a function or an object.")
|
|
}
|
|
|
|
const listeners = getListeners(this);
|
|
const optionsIsObj = isObject(options);
|
|
const capture = optionsIsObj
|
|
? Boolean(options.capture)
|
|
: Boolean(options);
|
|
const listenerType = capture ? CAPTURE : BUBBLE;
|
|
const newNode = {
|
|
listener,
|
|
listenerType,
|
|
passive: optionsIsObj && Boolean(options.passive),
|
|
once: optionsIsObj && Boolean(options.once),
|
|
next: null,
|
|
};
|
|
|
|
// Set it as the first node if the first node is null.
|
|
let node = listeners.get(eventName);
|
|
if (node === undefined) {
|
|
listeners.set(eventName, newNode);
|
|
return
|
|
}
|
|
|
|
// Traverse to the tail while checking duplication..
|
|
let prev = null;
|
|
while (node != null) {
|
|
if (
|
|
node.listener === listener &&
|
|
node.listenerType === listenerType
|
|
) {
|
|
// Should ignore duplication.
|
|
return
|
|
}
|
|
prev = node;
|
|
node = node.next;
|
|
}
|
|
|
|
// Add it.
|
|
prev.next = newNode;
|
|
},
|
|
|
|
/**
|
|
* Remove a given listener from this event target.
|
|
* @param {string} eventName The event name to remove.
|
|
* @param {Function} listener The listener to remove.
|
|
* @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener.
|
|
* @returns {void}
|
|
*/
|
|
removeEventListener(eventName, listener, options) {
|
|
if (listener == null) {
|
|
return
|
|
}
|
|
|
|
const listeners = getListeners(this);
|
|
const capture = isObject(options)
|
|
? Boolean(options.capture)
|
|
: Boolean(options);
|
|
const listenerType = capture ? CAPTURE : BUBBLE;
|
|
|
|
let prev = null;
|
|
let node = listeners.get(eventName);
|
|
while (node != null) {
|
|
if (
|
|
node.listener === listener &&
|
|
node.listenerType === listenerType
|
|
) {
|
|
if (prev !== null) {
|
|
prev.next = node.next;
|
|
} else if (node.next !== null) {
|
|
listeners.set(eventName, node.next);
|
|
} else {
|
|
listeners.delete(eventName);
|
|
}
|
|
return
|
|
}
|
|
|
|
prev = node;
|
|
node = node.next;
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Dispatch a given event.
|
|
* @param {Event|{type:string}} event The event to dispatch.
|
|
* @returns {boolean} `false` if canceled.
|
|
*/
|
|
dispatchEvent(event) {
|
|
if (event == null || typeof event.type !== "string") {
|
|
throw new TypeError('"event.type" should be a string.')
|
|
}
|
|
|
|
// If listeners aren't registered, terminate.
|
|
const listeners = getListeners(this);
|
|
const eventName = event.type;
|
|
let node = listeners.get(eventName);
|
|
if (node == null) {
|
|
return true
|
|
}
|
|
|
|
// Since we cannot rewrite several properties, so wrap object.
|
|
const wrappedEvent = wrapEvent(this, event);
|
|
|
|
// This doesn't process capturing phase and bubbling phase.
|
|
// This isn't participating in a tree.
|
|
let prev = null;
|
|
while (node != null) {
|
|
// Remove this listener if it's once
|
|
if (node.once) {
|
|
if (prev !== null) {
|
|
prev.next = node.next;
|
|
} else if (node.next !== null) {
|
|
listeners.set(eventName, node.next);
|
|
} else {
|
|
listeners.delete(eventName);
|
|
}
|
|
} else {
|
|
prev = node;
|
|
}
|
|
|
|
// Call this listener
|
|
setPassiveListener(
|
|
wrappedEvent,
|
|
node.passive ? node.listener : null
|
|
);
|
|
if (typeof node.listener === "function") {
|
|
try {
|
|
node.listener.call(this, wrappedEvent);
|
|
} catch (err) {
|
|
if (
|
|
typeof console !== "undefined" &&
|
|
typeof console.error === "function"
|
|
) {
|
|
console.error(err);
|
|
}
|
|
}
|
|
} else if (
|
|
node.listenerType !== ATTRIBUTE &&
|
|
typeof node.listener.handleEvent === "function"
|
|
) {
|
|
node.listener.handleEvent(wrappedEvent);
|
|
}
|
|
|
|
// Break if `event.stopImmediatePropagation` was called.
|
|
if (isStopped(wrappedEvent)) {
|
|
break
|
|
}
|
|
|
|
node = node.next;
|
|
}
|
|
setPassiveListener(wrappedEvent, null);
|
|
setEventPhase(wrappedEvent, 0);
|
|
setCurrentTarget(wrappedEvent, null);
|
|
|
|
return !wrappedEvent.defaultPrevented
|
|
},
|
|
};
|
|
|
|
// `constructor` is not enumerable.
|
|
Object.defineProperty(EventTarget.prototype, "constructor", {
|
|
value: EventTarget,
|
|
configurable: true,
|
|
writable: true,
|
|
});
|
|
|
|
// Ensure `eventTarget instanceof window.EventTarget` is `true`.
|
|
if (
|
|
typeof window !== "undefined" &&
|
|
typeof window.EventTarget !== "undefined"
|
|
) {
|
|
Object.setPrototypeOf(EventTarget.prototype, window.EventTarget.prototype);
|
|
}
|
|
|
|
export default EventTarget;
|
|
export { defineEventAttribute, EventTarget };
|
|
//# sourceMappingURL=event-target-shim.mjs.map
|