mirror of
https://github.com/denoland/deno.git
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501 lines
14 KiB
TypeScript
501 lines
14 KiB
TypeScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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import * as domTypes from "./dom_types.ts";
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import { DenoError, ErrorKind } from "./errors.ts";
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import { hasOwnProperty, requiredArguments } from "./util.ts";
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import {
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getRoot,
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isNode,
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isShadowRoot,
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isShadowInclusiveAncestor,
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isSlotable,
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retarget
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} from "./dom_util.ts";
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import { window } from "./window.ts";
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// https://dom.spec.whatwg.org/#get-the-parent
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// Note: Nodes, shadow roots, and documents override this algorithm so we set it to null.
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function getEventTargetParent(
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_eventTarget: domTypes.EventTarget,
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_event: domTypes.Event
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): null {
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return null;
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}
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export const eventTargetAssignedSlot: unique symbol = Symbol();
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export const eventTargetHasActivationBehavior: unique symbol = Symbol();
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export class EventTarget implements domTypes.EventTarget {
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public [domTypes.eventTargetHost]: domTypes.EventTarget | null = null;
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public [domTypes.eventTargetListeners]: {
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[type in string]: domTypes.EventListener[];
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} = {};
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public [domTypes.eventTargetMode] = "";
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public [domTypes.eventTargetNodeType]: domTypes.NodeType =
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domTypes.NodeType.DOCUMENT_FRAGMENT_NODE;
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private [eventTargetAssignedSlot] = false;
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private [eventTargetHasActivationBehavior] = false;
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public addEventListener(
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type: string,
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callback: (event: domTypes.Event) => void | null,
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options?: domTypes.AddEventListenerOptions | boolean
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): void {
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const this_ = this || window;
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requiredArguments("EventTarget.addEventListener", arguments.length, 2);
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const normalizedOptions: domTypes.AddEventListenerOptions = eventTargetHelpers.normalizeAddEventHandlerOptions(
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options
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);
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if (callback === null) {
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return;
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}
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const listeners = this_[domTypes.eventTargetListeners];
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if (!hasOwnProperty(listeners, type)) {
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listeners[type] = [];
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}
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for (let i = 0; i < listeners[type].length; ++i) {
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const listener = listeners[type][i];
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if (
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((typeof listener.options === "boolean" &&
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listener.options === normalizedOptions.capture) ||
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(typeof listener.options === "object" &&
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listener.options.capture === normalizedOptions.capture)) &&
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listener.callback === callback
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) {
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return;
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}
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}
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// eslint-disable-next-line @typescript-eslint/no-this-alias
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const eventTarget = this;
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listeners[type].push({
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callback,
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options: normalizedOptions,
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handleEvent(event: domTypes.Event): void {
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this.callback.call(eventTarget, event);
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}
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} as domTypes.EventListener);
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}
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public removeEventListener(
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type: string,
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callback: (event: domTypes.Event) => void | null,
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options?: domTypes.EventListenerOptions | boolean
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): void {
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const this_ = this || window;
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requiredArguments("EventTarget.removeEventListener", arguments.length, 2);
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const listeners = this_[domTypes.eventTargetListeners];
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if (hasOwnProperty(listeners, type) && callback !== null) {
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listeners[type] = listeners[type].filter(
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(listener): boolean => listener.callback !== callback
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);
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}
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const normalizedOptions: domTypes.EventListenerOptions = eventTargetHelpers.normalizeEventHandlerOptions(
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options
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);
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if (callback === null) {
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// Optimization, not in the spec.
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return;
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}
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if (!listeners[type]) {
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return;
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}
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for (let i = 0; i < listeners[type].length; ++i) {
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const listener = listeners[type][i];
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if (
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((typeof listener.options === "boolean" &&
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listener.options === normalizedOptions.capture) ||
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(typeof listener.options === "object" &&
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listener.options.capture === normalizedOptions.capture)) &&
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listener.callback === callback
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) {
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listeners[type].splice(i, 1);
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break;
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}
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}
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}
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public dispatchEvent(event: domTypes.Event): boolean {
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const this_ = this || window;
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requiredArguments("EventTarget.dispatchEvent", arguments.length, 1);
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const listeners = this_[domTypes.eventTargetListeners];
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if (!hasOwnProperty(listeners, event.type)) {
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return true;
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}
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if (event.dispatched || !event.initialized) {
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throw new DenoError(
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ErrorKind.InvalidData,
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"Tried to dispatch an uninitialized event"
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);
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}
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if (event.eventPhase !== domTypes.EventPhase.NONE) {
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throw new DenoError(
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ErrorKind.InvalidData,
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"Tried to dispatch a dispatching event"
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);
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}
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return eventTargetHelpers.dispatch(this_, event);
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}
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get [Symbol.toStringTag](): string {
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return "EventTarget";
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}
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}
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const eventTargetHelpers = {
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// https://dom.spec.whatwg.org/#concept-event-dispatch
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dispatch(
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targetImpl: EventTarget,
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eventImpl: domTypes.Event,
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targetOverride?: domTypes.EventTarget
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): boolean {
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let clearTargets = false;
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let activationTarget = null;
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eventImpl.dispatched = true;
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targetOverride = targetOverride || targetImpl;
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let relatedTarget = retarget(eventImpl.relatedTarget, targetImpl);
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if (
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targetImpl !== relatedTarget ||
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targetImpl === eventImpl.relatedTarget
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) {
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const touchTargets: domTypes.EventTarget[] = [];
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eventTargetHelpers.appendToEventPath(
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eventImpl,
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targetImpl,
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targetOverride,
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relatedTarget,
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touchTargets,
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false
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);
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const isActivationEvent = eventImpl.type === "click";
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if (isActivationEvent && targetImpl[eventTargetHasActivationBehavior]) {
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activationTarget = targetImpl;
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}
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let slotInClosedTree = false;
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let slotable =
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isSlotable(targetImpl) && targetImpl[eventTargetAssignedSlot]
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? targetImpl
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: null;
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let parent = getEventTargetParent(targetImpl, eventImpl);
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// Populate event path
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// https://dom.spec.whatwg.org/#event-path
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while (parent !== null) {
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if (slotable !== null) {
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slotable = null;
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const parentRoot = getRoot(parent);
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if (
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isShadowRoot(parentRoot) &&
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parentRoot &&
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parentRoot[domTypes.eventTargetMode] === "closed"
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) {
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slotInClosedTree = true;
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}
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}
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relatedTarget = retarget(eventImpl.relatedTarget, parent);
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if (
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isNode(parent) &&
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isShadowInclusiveAncestor(getRoot(targetImpl), parent)
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) {
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eventTargetHelpers.appendToEventPath(
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eventImpl,
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parent,
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null,
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relatedTarget,
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touchTargets,
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slotInClosedTree
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);
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} else if (parent === relatedTarget) {
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parent = null;
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} else {
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targetImpl = parent;
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if (
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isActivationEvent &&
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activationTarget === null &&
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targetImpl[eventTargetHasActivationBehavior]
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) {
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activationTarget = targetImpl;
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}
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eventTargetHelpers.appendToEventPath(
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eventImpl,
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parent,
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targetImpl,
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relatedTarget,
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touchTargets,
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slotInClosedTree
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);
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}
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if (parent !== null) {
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parent = getEventTargetParent(parent, eventImpl);
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}
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slotInClosedTree = false;
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}
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let clearTargetsTupleIndex = -1;
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for (
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let i = eventImpl.path.length - 1;
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i >= 0 && clearTargetsTupleIndex === -1;
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i--
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) {
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if (eventImpl.path[i].target !== null) {
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clearTargetsTupleIndex = i;
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}
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}
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const clearTargetsTuple = eventImpl.path[clearTargetsTupleIndex];
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clearTargets =
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(isNode(clearTargetsTuple.target) &&
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isShadowRoot(getRoot(clearTargetsTuple.target))) ||
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(isNode(clearTargetsTuple.relatedTarget) &&
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isShadowRoot(getRoot(clearTargetsTuple.relatedTarget)));
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eventImpl.eventPhase = domTypes.EventPhase.CAPTURING_PHASE;
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for (let i = eventImpl.path.length - 1; i >= 0; --i) {
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const tuple = eventImpl.path[i];
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if (tuple.target === null) {
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eventTargetHelpers.invokeEventListeners(targetImpl, tuple, eventImpl);
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}
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}
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for (let i = 0; i < eventImpl.path.length; i++) {
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const tuple = eventImpl.path[i];
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if (tuple.target !== null) {
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eventImpl.eventPhase = domTypes.EventPhase.AT_TARGET;
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} else {
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eventImpl.eventPhase = domTypes.EventPhase.BUBBLING_PHASE;
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}
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if (
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(eventImpl.eventPhase === domTypes.EventPhase.BUBBLING_PHASE &&
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eventImpl.bubbles) ||
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eventImpl.eventPhase === domTypes.EventPhase.AT_TARGET
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) {
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eventTargetHelpers.invokeEventListeners(targetImpl, tuple, eventImpl);
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}
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}
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}
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eventImpl.eventPhase = domTypes.EventPhase.NONE;
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eventImpl.currentTarget = null;
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eventImpl.path = [];
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eventImpl.dispatched = false;
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eventImpl.cancelBubble = false;
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eventImpl.cancelBubbleImmediately = false;
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if (clearTargets) {
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eventImpl.target = null;
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eventImpl.relatedTarget = null;
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}
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// TODO: invoke activation targets if HTML nodes will be implemented
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// if (activationTarget !== null) {
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// if (!eventImpl.defaultPrevented) {
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// activationTarget._activationBehavior();
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// }
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// }
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return !eventImpl.defaultPrevented;
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},
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// https://dom.spec.whatwg.org/#concept-event-listener-invoke
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invokeEventListeners(
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targetImpl: EventTarget,
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tuple: domTypes.EventPath,
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eventImpl: domTypes.Event
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): void {
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const tupleIndex = eventImpl.path.indexOf(tuple);
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for (let i = tupleIndex; i >= 0; i--) {
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const t = eventImpl.path[i];
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if (t.target) {
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eventImpl.target = t.target;
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break;
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}
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}
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eventImpl.relatedTarget = tuple.relatedTarget;
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if (eventImpl.cancelBubble) {
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return;
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}
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eventImpl.currentTarget = tuple.item;
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eventTargetHelpers.innerInvokeEventListeners(
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targetImpl,
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eventImpl,
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tuple.item[domTypes.eventTargetListeners]
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);
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},
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// https://dom.spec.whatwg.org/#concept-event-listener-inner-invoke
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innerInvokeEventListeners(
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targetImpl: EventTarget,
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eventImpl: domTypes.Event,
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targetListeners: { [type in string]: domTypes.EventListener[] }
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): boolean {
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let found = false;
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const { type } = eventImpl;
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if (!targetListeners || !targetListeners[type]) {
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return found;
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}
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// Copy event listeners before iterating since the list can be modified during the iteration.
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const handlers = targetListeners[type].slice();
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for (let i = 0; i < handlers.length; i++) {
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const listener = handlers[i];
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let capture, once, passive;
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if (typeof listener.options === "boolean") {
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capture = listener.options;
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once = false;
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passive = false;
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} else {
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capture = listener.options.capture;
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once = listener.options.once;
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passive = listener.options.passive;
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}
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// Check if the event listener has been removed since the listeners has been cloned.
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if (!targetListeners[type].includes(listener)) {
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continue;
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}
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found = true;
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if (
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(eventImpl.eventPhase === domTypes.EventPhase.CAPTURING_PHASE &&
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!capture) ||
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(eventImpl.eventPhase === domTypes.EventPhase.BUBBLING_PHASE && capture)
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) {
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continue;
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}
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if (once) {
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targetListeners[type].splice(
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targetListeners[type].indexOf(listener),
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1
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);
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}
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if (passive) {
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eventImpl.inPassiveListener = true;
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}
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try {
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listener.handleEvent(eventImpl);
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} catch (error) {
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throw new DenoError(ErrorKind.Interrupted, error.message);
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}
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eventImpl.inPassiveListener = false;
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if (eventImpl.cancelBubbleImmediately) {
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return found;
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}
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}
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return found;
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},
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normalizeAddEventHandlerOptions(
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options: boolean | domTypes.AddEventListenerOptions | undefined
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): domTypes.AddEventListenerOptions {
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if (typeof options === "boolean" || typeof options === "undefined") {
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const returnValue: domTypes.AddEventListenerOptions = {
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capture: Boolean(options),
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once: false,
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passive: false
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};
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return returnValue;
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} else {
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return options;
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}
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},
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normalizeEventHandlerOptions(
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options: boolean | domTypes.EventListenerOptions | undefined
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): domTypes.EventListenerOptions {
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if (typeof options === "boolean" || typeof options === "undefined") {
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const returnValue: domTypes.EventListenerOptions = {
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capture: Boolean(options)
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};
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return returnValue;
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} else {
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return options;
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}
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},
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// https://dom.spec.whatwg.org/#concept-event-path-append
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appendToEventPath(
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eventImpl: domTypes.Event,
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target: domTypes.EventTarget,
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targetOverride: domTypes.EventTarget | null,
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relatedTarget: domTypes.EventTarget | null,
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touchTargets: domTypes.EventTarget[],
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slotInClosedTree: boolean
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): void {
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const itemInShadowTree = isNode(target) && isShadowRoot(getRoot(target));
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const rootOfClosedTree =
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isShadowRoot(target) && target[domTypes.eventTargetMode] === "closed";
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eventImpl.path.push({
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item: target,
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itemInShadowTree,
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target: targetOverride,
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relatedTarget,
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touchTargetList: touchTargets,
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rootOfClosedTree,
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slotInClosedTree
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});
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}
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};
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/** Built-in objects providing `get` methods for our
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* interceptable JavaScript operations.
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*/
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Reflect.defineProperty(EventTarget.prototype, "addEventListener", {
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enumerable: true
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});
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Reflect.defineProperty(EventTarget.prototype, "removeEventListener", {
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enumerable: true
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});
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Reflect.defineProperty(EventTarget.prototype, "dispatchEvent", {
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enumerable: true
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});
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