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

   1 // Copyright 2014 The ChromeOS IME Authors. All Rights Reserved.
   2 // limitations under the License.
   3 // See the License for the specific language governing permissions and
   4 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   5 // distributed under the License is distributed on an "AS-IS" BASIS,
   6 // Unless required by applicable law or agreed to in writing, software
   7 //
   8 //      http://www.apache.org/licenses/LICENSE-2.0
   9 //
  10 // You may obtain a copy of the License at
  11 // you may not use this file except in compliance with the License.
  12 // Licensed under the Apache License, Version 2.0 (the "License");
  13 //
  14 goog.provide('i18n.input.chrome.inputview.handler.Util');
  15
  16 goog.require('goog.dom');
  17 goog.require('goog.events.EventType');
  18
  19 goog.scope(function() {
  20 var Util = i18n.input.chrome.inputview.handler.Util;
  21
  22
  23 /**
  24  * The mouse event identifier.
  25  *
  26  * @type {number}
  27  */
  28 Util.MOUSE_EVENT_IDENTIFIER = -1;
  29
  30
  31 /**
  32  * Represents invalid event identifier.
  33  *
  34  * @type {number}
  35  */
  36 Util.INVALID_EVENT_IDENTIFIER = -2;
  37
  38
  39 /**
  40  * Gets the view.
  41  *
  42  * @param {Node} target .
  43  * @return {i18n.input.chrome.inputview.elements.Element} .
  44  */
  45 Util.getView = function(target) {
  46   if (!target) {
  47     return null;
  48   }
  49   var element = /** @type {!Element} */ (target);
  50   var view = element['view'];
  51   while (!view && element) {
  52     view = element['view'];
  53     element = goog.dom.getParentElement(element);
  54   }
  55   return view;
  56 };
  57
  58
  59 /**
  60  * Gets the identifier from |e|. If |e| is a MouseEvent, returns -1.
  61  *
  62  * @param {!Event|!Touch|!goog.events.BrowserEvent} e The event.
  63  * @return {number} .
  64  *
  65  */
  66 Util.getEventIdentifier = function(e) {
  67   var nativeEvt = e.getBrowserEvent ? e.getBrowserEvent() : e;
  68   if (nativeEvt.changedTouches) {
  69     if (e.type == goog.events.EventType.TOUCHMOVE) {
  70       console.error('TouchMove is not expected.');
  71     }
  72     // TouchStart and TouchEnd should only contains one Touch in changedTouches.
  73     // The spec didn't have this restriction but it is safe to assume it in
  74     // Chrome.
  75     nativeEvt = nativeEvt.changedTouches[0];
  76   }
  77   return nativeEvt.identifier === undefined ?
  78       Util.MOUSE_EVENT_IDENTIFIER : nativeEvt.identifier;
  79 };
  80
  81
  82 });  // goog.scope