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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const { Class } = require("../../core/heritage");
const { removeListener, on } = require("../../dom/events");
/**
* Event targets
* can be added / removed by calling `observe / ignore` methods. Composer should
* provide array of event types it wishes to handle as property
* `supportedEventsTypes` and function for handling all those events as
* `handleEvent` property.
*/
exports.DOMEventAssembler = Class({
/**
* Function that is supposed to handle all the supported events (that are
* present in the `supportedEventsTypes`) from all the observed
* `eventTargets`.
* @param {Event} event
* Event being dispatched.
*/
handleEvent() {
throw new TypeError("Instance of DOMEventAssembler must implement `handleEvent` method");
},
/**
* Array of supported event names.
* @type {String[]}
*/
get supportedEventsTypes() {
throw new TypeError("Instance of DOMEventAssembler must implement `handleEvent` field");
},
/**
* Adds `eventTarget` to the list of observed `eventTarget`s. Listeners for
* supported events will be registered on the given `eventTarget`.
* @param {EventTarget} eventTarget
*/
observe: function observe(eventTarget) {
this.supportedEventsTypes.forEach(function(eventType) {
on(eventTarget, eventType, this);
}, this);
},
/**
* Removes `eventTarget` from the list of observed `eventTarget`s. Listeners
* for all supported events will be unregistered from the given `eventTarget`.
* @param {EventTarget} eventTarget
*/
ignore: function ignore(eventTarget) {
this.supportedEventsTypes.forEach(function(eventType) {
removeListener(eventTarget, eventType, this);
}, this);
}
});
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