remoting/tools/javascript_key_tester/chord_tracker.js

   1 /* Copyright (c) 2014 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
   6 /**
   7  * @constructor
   8  * @param {HTMLElement} parentDiv
   9  */
  10 var ChordTracker = function(parentDiv) {
  11   /** @type {HTMLElement} */
  12   this.parentDiv_ = parentDiv;
  13   /** @type {HTMLElement} */
  14   this.currentDiv_ = null;
  15   /** @type {Object<HTMLElement>} */
  16   this.pressedKeys_ = {};
  17 };
  18
  19 /**
  20  * @param {string} code The PNaCl "code" string.
  21  * @param {string} title
  22  * @return {void}
  23  */
  24 ChordTracker.prototype.addKeyUpEvent = function(code, title) {
  25   var span = this.addSpanElement_('key-up', code, title);
  26   delete this.pressedKeys_[code];
  27   if (!this.keysPressed_()) {
  28     this.end_();
  29   }
  30 };
  31
  32 /**
  33  * @param {string} code The PNaCl "code" string.
  34  * @param {string} title
  35  * @return {void}
  36  */
  37 ChordTracker.prototype.addKeyDownEvent = function(code, title) {
  38   var span = this.addSpanElement_('key-down', code, title);
  39   this.pressedKeys_[code] = span;
  40 };
  41
  42 /**
  43  * @param {string} characterText
  44  * @param {string} title
  45  * @return {void}
  46  */
  47 ChordTracker.prototype.addCharEvent = function(characterText, title) {
  48   this.addSpanElement_('char-event', characterText, title);
  49 };
  50
  51 /**
  52  * @return {void}
  53  */
  54 ChordTracker.prototype.releaseAllKeys = function() {
  55   this.end_();
  56   for (var i in this.pressedKeys_) {
  57     this.pressedKeys_[i].classList.add('unreleased');
  58   }
  59   this.pressedKeys_ = {};
  60 }
  61
  62 /**
  63  * @private
  64  * @param {string} className
  65  * @param {string} text
  66  * @param {string} title
  67  * @return {HTMLElement}
  68  */
  69 ChordTracker.prototype.addSpanElement_ = function(className, text, title) {
  70   this.begin_();
  71   var span = /** @type {HTMLElement} */ (document.createElement('span'));
  72   span.classList.add(className);
  73   span.classList.add('key-div');
  74   span.innerText = text;
  75   span.title = title;
  76   this.currentDiv_.appendChild(span);
  77   return span;
  78 }
  79
  80 /**
  81  * @private
  82  */
  83 ChordTracker.prototype.begin_ = function() {
  84   if (this.currentDiv_) {
  85     return;
  86   }
  87   this.currentDiv_ = /** @type {HTMLElement} */ (document.createElement('div'));
  88   this.currentDiv_.classList.add('chord-div');
  89   this.parentDiv_.appendChild(this.currentDiv_);
  90 };
  91
  92 /**
  93  * @private
  94  */
  95 ChordTracker.prototype.end_ = function() {
  96   if (!this.currentDiv_) {
  97     return;
  98   }
  99   if (this.keysPressed_()) {
 100     this.currentDiv_.classList.add('some-keys-still-pressed');
 101   } else {
 102     this.currentDiv_.classList.add('all-keys-released');
 103   }
 104   this.currentDiv_ = null;
 105 };
 106
 107 /**
 108  * @return {boolean} True if there are any keys pressed down.
 109  * @private
 110  */
 111 ChordTracker.prototype.keysPressed_ = function() {
 112   for (var property in this.pressedKeys_) {
 113     return true;
 114   }
 115   return false;
 116 };