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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 /** | 5 /** |
6 * @fileoverview Braille command definitions. | 6 * @fileoverview Braille command definitions. |
7 * These types are adapted from Chrome's private braille API. | 7 * These types are adapted from Chrome's private braille API. |
8 * They can be found in the Chrome source repo at: | 8 * They can be found in the Chrome source repo at: |
9 * src/chrome/common/extensions/api/braille_display_private.idl | 9 * src/chrome/common/extensions/api/braille_display_private.idl |
10 * We define them here since they don't actually exist as bindings under | 10 * We define them here since they don't actually exist as bindings under |
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87 var SPECIAL_CODES = { | 87 var SPECIAL_CODES = { |
88 'Backspace': 0x08, | 88 'Backspace': 0x08, |
89 'Tab': 0x09, | 89 'Tab': 0x09, |
90 'Enter': 0x0A | 90 'Enter': 0x0A |
91 }; | 91 }; |
92 // Note, the Chrome virtual keyboard falls back on the first character of the | 92 // Note, the Chrome virtual keyboard falls back on the first character of the |
93 // key code if the key is not one of the above. Do the same here. | 93 // key code if the key is not one of the above. Do the same here. |
94 return SPECIAL_CODES[keyCode] || keyCode.charCodeAt(0); | 94 return SPECIAL_CODES[keyCode] || keyCode.charCodeAt(0); |
95 }; | 95 }; |
96 | 96 |
| 97 /* |
| 98 * Note: Some of the below mappings contain raw braille dot |
| 99 * patterns. These are written out in binary form to make clear |
| 100 * exactly what dots in the braille cell make up the pattern. The |
| 101 * braille cell is arranged in a 2 by 4 dot grid with each dot |
| 102 * assigned a number from 1-8. |
| 103 * 1 4 |
| 104 * 2 5 |
| 105 * 3 6 |
| 106 * 7 8 |
| 107 * |
| 108 * In binary form, the dot number minus 1 maps to the bit position |
| 109 * (from right to left). |
| 110 * For example, dots 1-6-7 would be |
| 111 * 0b1100001 |
| 112 */ |
| 113 |
| 114 /** |
| 115 * Maps a braille pattern to a standard key code. |
| 116 * @type {!Object<number, string>} |
| 117 */ |
| 118 cvox.BrailleKeyEvent.brailleDotsToStandardKeyCode = { |
| 119 0b1: 'A', |
| 120 0b11: 'B', |
| 121 0b1001: 'C', |
| 122 0b11001: 'D', |
| 123 0b10001: 'E', |
| 124 0b1011: 'F', |
| 125 0b11011: 'G', |
| 126 0b10011: 'H', |
| 127 0b1010: 'I', |
| 128 0b11010: 'J', |
| 129 0b101: 'K', |
| 130 0b111: 'L', |
| 131 0b1101: 'M', |
| 132 0b11101: 'N', |
| 133 0b10101: 'O', |
| 134 0b1111: 'P', |
| 135 0b11111: 'Q', |
| 136 0b10111: 'R', |
| 137 0b1110: 'S', |
| 138 0b11110: 'T', |
| 139 0b100101: 'U', |
| 140 0b100111: 'V', |
| 141 0b111010: 'W', |
| 142 0b101101: 'X', |
| 143 0b111101: 'Y', |
| 144 0b110101: 'Z', |
| 145 0b110100: '0', |
| 146 0b10: '1', |
| 147 0b110: '2', |
| 148 0b10010: '3', |
| 149 0b110010: '4', |
| 150 0b100010: '5', |
| 151 0b10110: '6', |
| 152 0b110110: '7', |
| 153 0b100110: '8', |
| 154 0b10100: '9' |
| 155 }; |
| 156 |
| 157 /** |
| 158 * Maps a braille chord pattern to a standard key code. |
| 159 * @type {!Object<number, string>} |
| 160 */ |
| 161 cvox.BrailleKeyEvent.brailleChordsToStandardKeyCode = { |
| 162 0b1000000: 'Backspace', |
| 163 0b10100: 'Tab', |
| 164 0b110101: 'Escape', |
| 165 0b101000: 'Enter' |
| 166 }; |
| 167 |
| 168 /** |
| 169 * Maps a braille dot chord pattern to standard key modifiers. |
| 170 */ |
| 171 cvox.BrailleKeyEvent.brailleDotsToModifiers = { |
| 172 0b010010: {ctrlKey: true}, |
| 173 0b100100: {altKey: true}, |
| 174 0b1000100: {shiftKey: true}, |
| 175 0b1010010: {ctrlKey: true, shiftKey: true}, |
| 176 0b1100100: {altKey: true, shiftKey: true} |
| 177 }; |
| 178 |
97 | 179 |
98 /** | 180 /** |
99 * Map from DOM level 4 key codes to legacy numeric key codes. | 181 * Map from DOM level 4 key codes to legacy numeric key codes. |
100 * @private {Object<number>} | 182 * @private {Object<number>} |
101 */ | 183 */ |
102 cvox.BrailleKeyEvent.legacyKeyCodeMap_ = { | 184 cvox.BrailleKeyEvent.legacyKeyCodeMap_ = { |
103 'Backspace': 8, | 185 'Backspace': 8, |
104 'Tab': 9, | 186 'Tab': 9, |
105 'Enter': 13, | 187 'Enter': 13, |
106 'Escape': 27, | 188 'Escape': 27, |
107 'Home': 36, | 189 'Home': 36, |
108 'ArrowLeft': 37, | 190 'ArrowLeft': 37, |
109 'ArrowUp': 38, | 191 'ArrowUp': 38, |
110 'ArrowRight': 39, | 192 'ArrowRight': 39, |
111 'ArrowDown': 40, | 193 'ArrowDown': 40, |
112 'PageUp': 33, | 194 'PageUp': 33, |
113 'PageDown': 34, | 195 'PageDown': 34, |
114 'End': 35, | 196 'End': 35, |
115 'Insert': 45, | 197 'Insert': 45, |
116 'Delete': 46 | 198 'Delete': 46, |
| 199 'AudioVolumeDown': 174, |
| 200 'AudioVolumeUp': 175 |
117 }; | 201 }; |
118 | 202 |
119 // Add the F1 to F12 keys. | |
120 (function() { | 203 (function() { |
| 204 // Add 0-9. |
| 205 for (var i = '0'.charCodeAt(0); i < '9'.charCodeAt(0); ++i) { |
| 206 cvox.BrailleKeyEvent.legacyKeyCodeMap_[String.fromCharCode(i)] = i; |
| 207 } |
| 208 |
| 209 // Add A-Z. |
| 210 for (var i = 'A'.charCodeAt(0); i < 'Z'.charCodeAt(0); ++i) { |
| 211 cvox.BrailleKeyEvent.legacyKeyCodeMap_[String.fromCharCode(i)] = i; |
| 212 } |
| 213 |
| 214 // Add the F1 to F12 keys. |
121 for (var i = 0; i < 12; ++i) { | 215 for (var i = 0; i < 12; ++i) { |
122 cvox.BrailleKeyEvent.legacyKeyCodeMap_['F' + (i + 1)] = 112 + i; | 216 cvox.BrailleKeyEvent.legacyKeyCodeMap_['F' + (i + 1)] = 112 + i; |
123 } | 217 } |
124 })(); | 218 })(); |
125 | 219 |
126 | 220 |
127 /** | 221 /** |
128 * The state of a braille display as represented in the | 222 * The state of a braille display as represented in the |
129 * chrome.brailleDisplayPrivate API. | 223 * chrome.brailleDisplayPrivate API. |
130 * @typedef {{available: boolean, textRowCount: number, | 224 * @typedef {{available: boolean, textRowCount: number, |
131 * textColumnCount: number}} | 225 * textColumnCount: number}} |
132 */ | 226 */ |
133 cvox.BrailleDisplayState; | 227 cvox.BrailleDisplayState; |
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