2 /* ***** BEGIN LICENSE BLOCK *****
3 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
5 * The contents of this file are subject to the Mozilla Public License Version
6 * 1.1 (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 * http://www.mozilla.org/MPL/
10 * Software distributed under the License is distributed on an "AS IS" basis,
11 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 * for the specific language governing rights and limitations under the
15 * The Original Code is guacamole-common-js.
17 * The Initial Developer of the Original Code is
19 * Portions created by the Initial Developer are Copyright (C) 2010
20 * the Initial Developer. All Rights Reserved.
24 * Alternatively, the contents of this file may be used under the terms of
25 * either the GNU General Public License Version 2 or later (the "GPL"), or
26 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
27 * in which case the provisions of the GPL or the LGPL are applicable instead
28 * of those above. If you wish to allow use of your version of this file only
29 * under the terms of either the GPL or the LGPL, and not to allow others to
30 * use your version of this file under the terms of the MPL, indicate your
31 * decision by deleting the provisions above and replace them with the notice
32 * and other provisions required by the GPL or the LGPL. If you do not delete
33 * the provisions above, a recipient may use your version of this file under
34 * the terms of any one of the MPL, the GPL or the LGPL.
36 * ***** END LICENSE BLOCK ***** */
38 // Guacamole namespace
39 var Guacamole = Guacamole || {};
42 * Provides cross-browser and cross-keyboard keyboard for a specific element.
43 * Browser and keyboard layout variation is abstracted away, providing events
44 * which represent keys as their corresponding X11 keysym.
47 * @param {Element} element The Element to use to provide keyboard events.
49 Guacamole.Keyboard = function(element) {
52 * Reference to this Guacamole.Keyboard.
55 var guac_keyboard = this;
58 * Fired whenever the user presses a key with the element associated
59 * with this Guacamole.Keyboard in focus.
62 * @param {Number} keysym The keysym of the key being pressed.
63 * @returns {Boolean} true if the originating event of this keypress should
64 * be allowed through to the browser, false or undefined
67 this.onkeydown = null;
70 * Fired whenever the user releases a key with the element associated
71 * with this Guacamole.Keyboard in focus.
74 * @param {Number} keysym The keysym of the key being released.
75 * @returns {Boolean} true if the originating event of this key release
76 * should be allowed through to the browser, false or
77 * undefined otherwise.
82 * Map of known JavaScript keycodes which do not map to typable characters
83 * to their unshifted X11 keysym equivalents.
86 var unshiftedKeySym = {
87 8: 0xFF08, // backspace
93 19: 0xFF13, // pause/break
94 20: 0xFFE5, // caps lock
96 33: 0xFF55, // page up
97 34: 0xFF56, // page down
100 37: 0xFF51, // left arrow
101 38: 0xFF52, // up arrow
102 39: 0xFF53, // right arrow
103 40: 0xFF54, // down arrow
104 45: 0xFF63, // insert
105 46: 0xFFFF, // delete
106 91: 0xFFEB, // left window key (super_l)
107 92: 0xFF67, // right window key (menu key?)
108 93: null, // select key
121 144: 0xFF7F, // num lock
122 145: 0xFF14 // scroll lock
126 * Map of known JavaScript keycodes which do not map to typable characters
127 * to their shifted X11 keysym equivalents. Keycodes must only be listed
128 * here if their shifted X11 keysym equivalents differ from their unshifted
132 var shiftedKeySym = {
136 // Single key state/modifier buffer
137 var modShift = false;
141 var keydownChar = new Array();
143 // ID of routine repeating keystrokes. -1 = not repeating.
144 var repeatKeyTimeoutId = -1;
145 var repeatKeyIntervalId = -1;
147 // Starts repeating keystrokes
148 function startRepeat(keySym) {
149 repeatKeyIntervalId = setInterval(function() {
150 sendKeyReleased(keySym);
151 sendKeyPressed(keySym);
155 // Stops repeating keystrokes
156 function stopRepeat() {
157 if (repeatKeyTimeoutId != -1) clearInterval(repeatKeyTimeoutId);
158 if (repeatKeyIntervalId != -1) clearInterval(repeatKeyIntervalId);
162 function getKeySymFromKeyIdentifier(shifted, keyIdentifier) {
164 var unicodePrefixLocation = keyIdentifier.indexOf("U+");
165 if (unicodePrefixLocation >= 0) {
167 var hex = keyIdentifier.substring(unicodePrefixLocation+2);
168 var codepoint = parseInt(hex, 16);
171 // Convert case if shifted
173 typedCharacter = String.fromCharCode(codepoint).toLowerCase();
175 typedCharacter = String.fromCharCode(codepoint).toUpperCase();
178 codepoint = typedCharacter.charCodeAt(0);
180 return getKeySymFromCharCode(codepoint);
188 function getKeySymFromCharCode(keyCode) {
190 if (keyCode >= 0x0000 && keyCode <= 0x00FF)
193 if (keyCode >= 0x0100 && keyCode <= 0x10FFFF)
194 return 0x01000000 | keyCode;
200 function getKeySymFromKeyCode(keyCode) {
203 if (!modShift) keysym = unshiftedKeySym[keyCode];
205 keysym = shiftedKeySym[keyCode];
206 if (keysym == null) keysym = unshiftedKeySym[keyCode];
214 // Sends a single keystroke over the network
215 function sendKeyPressed(keysym) {
216 if (keysym != null && guac_keyboard.onkeydown)
217 return guac_keyboard.onkeydown(keysym) != false;
221 // Sends a single keystroke over the network
222 function sendKeyReleased(keysym) {
223 if (keysym != null && guac_keyboard.onkeyup)
224 return guac_keyboard.onkeyup(keysym) != false;
232 var keySymSource = null;
235 var keydownCode = null;
236 element.onkeydown = function(e) {
238 // Only intercept if handler set
239 if (!guac_keyboard.onkeydown) return true;
242 if (window.event) keynum = window.event.keyCode;
243 else if (e.which) keynum = e.which;
248 else if (keynum == 17)
250 else if (keynum == 18)
253 var keysym = getKeySymFromKeyCode(keynum);
255 // Get keysyms and events from KEYDOWN
256 keySymSource = KEYDOWN;
259 // If modifier keys are held down, and we have keyIdentifier
260 else if ((modCtrl || modAlt) && e.keyIdentifier) {
262 // Get keysym from keyIdentifier
263 keysym = getKeySymFromKeyIdentifier(modShift, e.keyIdentifier);
265 // Get keysyms and events from KEYDOWN
266 keySymSource = KEYDOWN;
271 // Get keysyms and events from KEYPRESS
272 keySymSource = KEYPRESS;
274 keydownCode = keynum;
276 // Ignore key if we don't need to use KEYPRESS.
277 // Send key event here
278 if (keySymSource == KEYDOWN) {
280 if (keydownChar[keynum] != keysym) {
283 keydownChar[keynum] = keysym;
284 var returnValue = sendKeyPressed(keysym);
286 // Clear old key repeat, if any.
289 // Start repeating (if not a modifier key) after a short delay
290 if (keynum != 16 && keynum != 17 && keynum != 18)
291 repeatKeyTimeoutId = setTimeout(function() { startRepeat(keysym); }, 500);
293 // Use return code provided by handler
298 // Default to canceling event if no keypress is being sent, but
299 // source of events is keydown.
309 element.onkeypress = function(e) {
311 // Only intercept if handler set
312 if (!guac_keyboard.onkeydown) return true;
314 if (keySymSource != KEYPRESS) return false;
317 if (window.event) keynum = window.event.keyCode;
318 else if (e.which) keynum = e.which;
320 var keysym = getKeySymFromCharCode(keynum);
321 if (keysym && keydownChar[keynum] != keysym) {
323 // If this button already pressed, release first
324 var lastKeyDownChar = keydownChar[keydownCode];
326 sendKeyReleased(lastKeyDownChar);
328 keydownChar[keydownCode] = keysym;
330 // Clear old key repeat, if any.
334 var returnValue = sendKeyPressed(keysym);
336 // Start repeating (if not a modifier key) after a short delay
337 repeatKeyTimeoutId = setTimeout(function() { startRepeat(keysym); }, 500);
342 // Default to canceling event if no keypress is being sent, but
343 // source of events is keypress.
349 element.onkeyup = function(e) {
351 // Only intercept if handler set
352 if (!guac_keyboard.onkeyup) return true;
355 if (window.event) keynum = window.event.keyCode;
356 else if (e.which) keynum = e.which;
361 else if (keynum == 17)
363 else if (keynum == 18)
368 // Get corresponding character
369 var lastKeyDownChar = keydownChar[keynum];
371 // Clear character record
372 keydownChar[keynum] = null;
374 // Send release event
375 return sendKeyReleased(lastKeyDownChar);
379 // When focus is lost, clear modifiers.
380 element.onblur = function() {