chromium/third_party/google_input_tools/src/chrome/os/inputview/handler/util.js

// Copyright 2014 The ChromeOS IME Authors. All Rights Reserved.
// limitations under the License.
// See the License for the specific language governing permissions and
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// distributed under the License is distributed on an "AS-IS" BASIS,
// Unless required by applicable law or agreed to in writing, software
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// You may obtain a copy of the License at
// you may not use this file except in compliance with the License.
// Licensed under the Apache License, Version 2.0 (the "License");
//
goog.provide('i18n.input.chrome.inputview.handler.Util');

goog.require('goog.dom');
goog.require('goog.events.EventType');

goog.scope(function() {
var Util = i18n.input.chrome.inputview.handler.Util;


/**
 * The mouse event identifier.
 *
 * @type {number}
 */
Util.MOUSE_EVENT_IDENTIFIER = -1;


/**
 * Represents invalid event identifier.
 *
 * @type {number}
 */
Util.INVALID_EVENT_IDENTIFIER = -2;


/**
 * Gets the view.
 *
 * @param {Node} target .
 * @return {i18n.input.chrome.inputview.elements.Element} .
 */
Util.getView = function(target) {
  if (!target) {
    return null;
  }
  var element = /** @type {!Element} */ (target);
  var view = element['view'];
  while (!view && element) {
    view = element['view'];
    element = goog.dom.getParentElement(element);
  }
  return view;
};


/**
 * Gets the identifier from |e|. If |e| is a MouseEvent, returns -1.
 *
 * @param {!Event|!Touch|!goog.events.BrowserEvent} e The event.
 * @return {number} .
 *
 */
Util.getEventIdentifier = function(e) {
  var nativeEvt = e.getBrowserEvent ? e.getBrowserEvent() : e;
  if (nativeEvt.changedTouches) {
    if (e.type == goog.events.EventType.TOUCHMOVE) {
      console.error('TouchMove is not expected.');
    }
    // TouchStart and TouchEnd should only contains one Touch in changedTouches.
    // The spec didn't have this restriction but it is safe to assume it in
    // Chrome.
    nativeEvt = nativeEvt.changedTouches[0];
  }
  return nativeEvt.identifier === undefined ?
      Util.MOUSE_EVENT_IDENTIFIER : nativeEvt.identifier;
};


});  // goog.scope