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      1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 var RowAlignment = {
      6   STRETCH: "stretch",
      7   LEFT: "left",
      8   RIGHT: "right",
      9   CENTER: "center",
     10 }
     11 
     12 /**
     13  * Ratio of key height and font size.
     14  * @type {number}
     15  */
     16 var FONT_SIZE_RATIO = 2.5;
     17 
     18 /**
     19  * @type {enum}
     20  * Possible layout alignments.
     21  */
     22 var LayoutAlignment = {
     23   CENTER: "center",
     24   STRETCH: "stretch",
     25 };
     26 
     27 /**
     28  * The enumerations of key sounds.
     29  * @const
     30  * @type {enum}
     31  */
     32 var Sound = {
     33   NONE: "none",
     34   DEFAULT: "keypress-standard",
     35 };
     36 
     37 /**
     38  * The enumeration of swipe directions.
     39  * @const
     40  * @type {Enum}
     41  */
     42 var SwipeDirection = {
     43   RIGHT: 0x1,
     44   LEFT: 0x2,
     45   UP: 0x4,
     46   DOWN: 0x8
     47 };
     48 
     49 /**
     50  * The ratio between the width and height of the key when in portrait mode.
     51  * @type {number}
     52  */
     53 var KEY_ASPECT_RATIO_PORTRAIT = 1;
     54 
     55 /**
     56  * The ratio between the width and height of the key when in landscape mode.
     57  * @type {number}
     58  */
     59 var KEY_ASPECT_RATIO_LANDSCAPE = 1.46;
     60 
     61 /**
     62  * The ratio between the height and width of the compact keyboard.
     63  * @type {number}
     64  */
     65 var DEFAULT_KEYBOARD_ASPECT_RATIO = 0.41;
     66 
     67 /**
     68  * The default weight of a key.
     69  * @type {number}
     70  */
     71 var DEFAULT_KEY_WEIGHT = 100;
     72 
     73 /**
     74  * The default volume for keyboard sounds.
     75  * @type {number}
     76  */
     77 var DEFAULT_VOLUME = 0.2;
     78 
     79 /**
     80  * The top padding on each key.
     81  * @type {number}
     82  */
     83 // TODO(rsadam): Remove this variable once figure out how to calculate this
     84 // number before the key is rendered.
     85 var KEY_PADDING_TOP = 1;
     86 var KEY_PADDING_BOTTOM = 1;
     87 
     88 /**
     89  * The greatest distance between a key and a touch point for a PointerEvent
     90  * to be processed.
     91  * @type {number}
     92  */
     93 var MAX_TOUCH_FUZZ_DISTANCE = 20;
     94 
     95 /**
     96  * The maximum number of extra pixels before a resize is triggered.
     97  * @type {number}
     98  */
     99 var RESIZE_THRESHOLD = 20;
    100 
    101 /**
    102  * The size of the pool to use for playing audio sounds on key press. This is to
    103  * enable the same sound to be overlayed, for example, when a repeat key is
    104  * pressed.
    105  * @type {number}
    106  */
    107 var SOUND_POOL_SIZE = 10;
    108 
    109 /**
    110  * Whether or not to enable sounds on key press.
    111  * @type {boolean}
    112  */
    113 var SOUND_ENABLED = false;
    114