third_party/google_input_tools/src/chrome/os/inputview/covariance.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.Covariance');
  15
  16 goog.require('i18n.input.chrome.inputview.elements.ElementType');
  17
  18
  19 goog.scope(function() {
  20 var ElementType = i18n.input.chrome.inputview.elements.ElementType;
  21
  22
  23
  24 /**
  25  * The covariance used for gaussian model.
  26  *
  27  * @constructor
  28  */
  29 i18n.input.chrome.inputview.Covariance = function() {
  30   /** @private {number} */
  31   this.breakDown_ = 0;
  32 };
  33 var Covariance = i18n.input.chrome.inputview.Covariance;
  34
  35
  36 /**
  37  * The break-down for covariance.
  38  *
  39  * @enum {number}
  40  */
  41 Covariance.BreakDown = {
  42   A11Y: 1,
  43   HORIZONTAL: 2,
  44   WIDE_SCREEN: 4
  45 };
  46
  47
  48 /**
  49  * The key type.
  50  *
  51  * @type {!Object.<ElementType, number>}
  52  */
  53 Covariance.ElementTypeMap = goog.object.create(
  54     ElementType.CHARACTER_KEY, 0,
  55     ElementType.COMPACT_KEY, 1
  56 );
  57
  58
  59 /**
  60  * The value.
  61  * Key: the break down value.
  62  * Value: A list - first is the covariance for full keyboard, second is for
  63  * compact.
  64  *
  65  * @private {!Object.<!Array.<number>>}
  66  */
  67 Covariance.VALUE_ = {
  68   0: [120, 160],
  69   1: [130, 0],
  70   2: [235, 342],
  71   3: [162, 0],
  72   4: [160, 213],
  73   5: [142, 0],
  74   6: [230, 332],
  75   7: [162, 0]
  76 };
  77
  78
  79 /**
  80  * Updates the covariance.
  81  *
  82  * @param {boolean} isWideScreen .
  83  * @param {boolean} isHorizontal .
  84  * @param {boolean} isA11y .
  85  */
  86 Covariance.prototype.update = function(isWideScreen, isHorizontal, isA11y) {
  87   this.breakDown_ = 0;
  88   if (isWideScreen) {
  89     this.breakDown_ |= Covariance.BreakDown.WIDE_SCREEN;
  90   }
  91   if (isHorizontal) {
  92     this.breakDown_ |= Covariance.BreakDown.HORIZONTAL;
  93   }
  94   if (isA11y) {
  95     this.breakDown_ |= Covariance.BreakDown.A11Y;
  96   }
  97 };
  98
  99
 100 /**
 101  * Gets the covariance value.
 102  *
 103  * @param {ElementType} type .
 104  */
 105 Covariance.prototype.getValue = function(type) {
 106   var index = Covariance.ElementTypeMap[type];
 107   return Covariance.VALUE_[this.breakDown_][index];
 108 };
 109
 110 }); // goog.scope
 111