LocalEventTrapMixin.js

/**
 * Copyright 2014-2015, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule LocalEventTrapMixin
 */

'use strict';

var ReactBrowserEventEmitter = require("./ReactBrowserEventEmitter");

var accumulateInto = require("./accumulateInto");
var forEachAccumulated = require("./forEachAccumulated");
var invariant = require("./invariant");

function remove(event) {
  event.remove();
}

var LocalEventTrapMixin = {
  trapBubbledEvent:function(topLevelType, handlerBaseName) {
    ("production" !== process.env.NODE_ENV ? invariant(this.isMounted(), 'Must be mounted to trap events') : invariant(this.isMounted()));
    // If a component renders to null or if another component fatals and causes
    // the state of the tree to be corrupted, `node` here can be null.
    var node = this.getDOMNode();
    ("production" !== process.env.NODE_ENV ? invariant(
      node,
      'LocalEventTrapMixin.trapBubbledEvent(...): Requires node to be rendered.'
    ) : invariant(node));
    var listener = ReactBrowserEventEmitter.trapBubbledEvent(
      topLevelType,
      handlerBaseName,
      node
    );
    this._localEventListeners =
      accumulateInto(this._localEventListeners, listener);
  },

  // trapCapturedEvent would look nearly identical. We don't implement that
  // method because it isn't currently needed.

  componentWillUnmount:function() {
    if (this._localEventListeners) {
      forEachAccumulated(this._localEventListeners, remove);
    }
  }
};

module.exports = LocalEventTrapMixin;