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diff --git a/tools/addon-sdk-1.5/packages/api-utils/lib/events/assembler.js b/tools/addon-sdk-1.5/packages/api-utils/lib/events/assembler.js
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--- a/tools/addon-sdk-1.5/packages/api-utils/lib/events/assembler.js
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-/* vim:set ts=2 sw=2 sts=2 et: */
-/* 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 { Trait } = require("../light-traits");
-const { removeListener, on } = require("../dom/events");
-
-/**
- * Trait may be used for building objects / composing traits that wish to handle
- * multiple dom events from multiple event targets in one place. 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 = Trait({
- /**
- * 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: Trait.required,
- /**
- * Array of supported event names.
- * @type {String[]}
- */
- supportedEventsTypes: Trait.required,
- /**
- * 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);
- }
-});