mirror of
https://github.com/gyurix1968/guacamole-client.git
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420 lines
12 KiB
JavaScript
420 lines
12 KiB
JavaScript
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is guacamole-common-js.
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*
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* The Initial Developer of the Original Code is
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* Michael Jumper.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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// Guacamole namespace
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var Guacamole = Guacamole || {};
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/**
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* Provides cross-browser and cross-keyboard keyboard for a specific element.
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* Browser and keyboard layout variation is abstracted away, providing events
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* which represent keys as their corresponding X11 keysym.
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*
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* @constructor
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* @param {Element} element The Element to use to provide keyboard events.
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*/
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Guacamole.Keyboard = function(element) {
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/**
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* Reference to this Guacamole.Keyboard.
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* @private
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*/
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var guac_keyboard = this;
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/**
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* Fired whenever the user presses a key with the element associated
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* with this Guacamole.Keyboard in focus.
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*
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* @event
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* @param {Number} keysym The keysym of the key being pressed.
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* @returns {Boolean} true if the originating event of this keypress should
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* be allowed through to the browser, false or undefined
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* otherwise.
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*/
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this.onkeydown = null;
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/**
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* Fired whenever the user releases a key with the element associated
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* with this Guacamole.Keyboard in focus.
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*
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* @event
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* @param {Number} keysym The keysym of the key being released.
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* @returns {Boolean} true if the originating event of this key release
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* should be allowed through to the browser, false or
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* undefined otherwise.
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*/
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this.onkeyup = null;
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/**
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* Map of known JavaScript keycodes which do not map to typable characters
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* to their unshifted X11 keysym equivalents.
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* @private
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*/
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var unshiftedKeySym = {
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8: 0xFF08, // backspace
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9: 0xFF09, // tab
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13: 0xFF0D, // enter
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16: 0xFFE1, // shift
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17: 0xFFE3, // ctrl
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18: 0xFFE9, // alt
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19: 0xFF13, // pause/break
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20: 0xFFE5, // caps lock
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27: 0xFF1B, // escape
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33: 0xFF55, // page up
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34: 0xFF56, // page down
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35: 0xFF57, // end
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36: 0xFF50, // home
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37: 0xFF51, // left arrow
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38: 0xFF52, // up arrow
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39: 0xFF53, // right arrow
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40: 0xFF54, // down arrow
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45: 0xFF63, // insert
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46: 0xFFFF, // delete
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91: 0xFFEB, // left window key (super_l)
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92: 0xFF67, // right window key (menu key?)
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93: null, // select key
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112: 0xFFBE, // f1
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113: 0xFFBF, // f2
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114: 0xFFC0, // f3
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115: 0xFFC1, // f4
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116: 0xFFC2, // f5
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117: 0xFFC3, // f6
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118: 0xFFC4, // f7
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119: 0xFFC5, // f8
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120: 0xFFC6, // f9
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121: 0xFFC7, // f10
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122: 0xFFC8, // f11
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123: 0xFFC9, // f12
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144: 0xFF7F, // num lock
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145: 0xFF14 // scroll lock
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};
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/**
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* Map of known JavaScript keycodes which do not map to typable characters
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* to their shifted X11 keysym equivalents. Keycodes must only be listed
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* here if their shifted X11 keysym equivalents differ from their unshifted
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* equivalents.
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* @private
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*/
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var shiftedKeySym = {
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18: 0xFFE7 // alt
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};
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/**
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* All modifiers and their states.
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*/
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this.modifiers = {
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/**
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* Whether shift is currently pressed.
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*/
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"shift": false,
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/**
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* Whether ctrl is currently pressed.
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*/
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"ctrl" : false,
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/**
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* Whether alt is currently pressed.
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*/
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"alt" : false
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};
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/**
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* The state of every key, indexed by keysym. If a particular key is
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* pressed, the value of pressed for that keysym will be true. If a key
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* is not currently pressed, the value for that keysym may be false or
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* undefined.
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*/
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this.pressed = [];
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var keydownChar = new Array();
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// ID of routine repeating keystrokes. -1 = not repeating.
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var repeatKeyTimeoutId = -1;
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var repeatKeyIntervalId = -1;
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// Starts repeating keystrokes
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function startRepeat(keySym) {
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repeatKeyIntervalId = setInterval(function() {
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sendKeyReleased(keySym);
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sendKeyPressed(keySym);
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}, 50);
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}
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// Stops repeating keystrokes
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function stopRepeat() {
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if (repeatKeyTimeoutId != -1) clearInterval(repeatKeyTimeoutId);
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if (repeatKeyIntervalId != -1) clearInterval(repeatKeyIntervalId);
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}
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function getKeySymFromKeyIdentifier(shifted, keyIdentifier) {
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var unicodePrefixLocation = keyIdentifier.indexOf("U+");
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if (unicodePrefixLocation >= 0) {
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var hex = keyIdentifier.substring(unicodePrefixLocation+2);
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var codepoint = parseInt(hex, 16);
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var typedCharacter;
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// Convert case if shifted
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if (shifted == 0)
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typedCharacter = String.fromCharCode(codepoint).toLowerCase();
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else
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typedCharacter = String.fromCharCode(codepoint).toUpperCase();
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// Get codepoint
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codepoint = typedCharacter.charCodeAt(0);
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return getKeySymFromCharCode(codepoint);
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}
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return null;
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}
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function getKeySymFromCharCode(keyCode) {
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if (keyCode >= 0x0000 && keyCode <= 0x00FF)
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return keyCode;
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if (keyCode >= 0x0100 && keyCode <= 0x10FFFF)
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return 0x01000000 | keyCode;
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return null;
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}
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function getKeySymFromKeyCode(keyCode) {
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var keysym = null;
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if (!guac_keyboard.modifiers.shift) keysym = unshiftedKeySym[keyCode];
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else {
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keysym = shiftedKeySym[keyCode];
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if (keysym == null) keysym = unshiftedKeySym[keyCode];
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}
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return keysym;
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}
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// Sends a single keystroke over the network
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function sendKeyPressed(keysym) {
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// Mark key as pressed
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guac_keyboard.pressed[keysym] = true;
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// Send key event
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if (keysym != null && guac_keyboard.onkeydown)
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return guac_keyboard.onkeydown(keysym) != false;
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return true;
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}
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// Sends a single keystroke over the network
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function sendKeyReleased(keysym) {
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// Mark key as released
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guac_keyboard.pressed[keysym] = false;
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// Send key event
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if (keysym != null && guac_keyboard.onkeyup)
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return guac_keyboard.onkeyup(keysym) != false;
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return true;
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}
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var KEYDOWN = 1;
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var KEYPRESS = 2;
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var keySymSource = null;
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// When key pressed
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var keydownCode = null;
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element.onkeydown = function(e) {
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// Only intercept if handler set
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if (!guac_keyboard.onkeydown) return true;
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var keynum;
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if (window.event) keynum = window.event.keyCode;
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else if (e.which) keynum = e.which;
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// Ctrl/Alt/Shift
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if (keynum == 16) guac_keyboard.modifiers.shift = true;
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else if (keynum == 17) guac_keyboard.modifiers.ctrl = true;
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else if (keynum == 18) guac_keyboard.modifiers.alt = true;
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// If keysym is defined for given key code, key events can come from
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// KEYDOWN.
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var keysym = getKeySymFromKeyCode(keynum);
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if (keysym)
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keySymSource = KEYDOWN;
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// Otherwise, if modifier keys are held down, try to get from keyIdentifier
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else if ((guac_keyboard.modifiers.ctrl || guac_keyboard.modifiers.alt) && e.keyIdentifier) {
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// Get keysym from keyIdentifier
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keysym = getKeySymFromKeyIdentifier(guac_keyboard.modifiers.shift, e.keyIdentifier);
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// Get keysyms and events from KEYDOWN
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keySymSource = KEYDOWN;
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}
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// Otherwise, resort to KEYPRESS
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else
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keySymSource = KEYPRESS;
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keydownCode = keynum;
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// Ignore key if we don't need to use KEYPRESS.
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// Send key event here
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if (keySymSource == KEYDOWN) {
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if (keydownChar[keynum] != keysym) {
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// Send event
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keydownChar[keynum] = keysym;
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var returnValue = sendKeyPressed(keysym);
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// Clear old key repeat, if any.
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stopRepeat();
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// Start repeating (if not a modifier key) after a short delay
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if (keynum != 16 && keynum != 17 && keynum != 18)
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repeatKeyTimeoutId = setTimeout(function() { startRepeat(keysym); }, 500);
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// Use return code provided by handler
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return returnValue;
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}
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// Default to canceling event if no keypress is being sent, but
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// source of events is keydown.
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return false;
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}
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return true;
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};
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// When key pressed
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element.onkeypress = function(e) {
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// Only intercept if handler set
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if (!guac_keyboard.onkeydown) return true;
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if (keySymSource != KEYPRESS) return false;
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var keynum;
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if (window.event) keynum = window.event.keyCode;
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else if (e.which) keynum = e.which;
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var keysym = getKeySymFromCharCode(keynum);
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if (keysym && keydownChar[keynum] != keysym) {
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// If this button already pressed, release first
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var lastKeyDownChar = keydownChar[keydownCode];
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if (lastKeyDownChar)
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sendKeyReleased(lastKeyDownChar);
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keydownChar[keydownCode] = keysym;
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// Clear old key repeat, if any.
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stopRepeat();
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// Send key event
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var returnValue = sendKeyPressed(keysym);
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// Start repeating (if not a modifier key) after a short delay
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repeatKeyTimeoutId = setTimeout(function() { startRepeat(keysym); }, 500);
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return returnValue;
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}
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// Default to canceling event if no keypress is being sent, but
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// source of events is keypress.
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return false;
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};
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// When key released
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element.onkeyup = function(e) {
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// Only intercept if handler set
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if (!guac_keyboard.onkeyup) return true;
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var keynum;
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if (window.event) keynum = window.event.keyCode;
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else if (e.which) keynum = e.which;
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// Ctrl/Alt/Shift
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if (keynum == 16) guac_keyboard.modifiers.shift = false;
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else if (keynum == 17) guac_keyboard.modifiers.ctrl = false;
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else if (keynum == 18) guac_keyboard.modifiers.alt = false;
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else
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stopRepeat();
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// Get corresponding character
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var lastKeyDownChar = keydownChar[keynum];
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// Clear character record
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keydownChar[keynum] = null;
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// Send release event
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return sendKeyReleased(lastKeyDownChar);
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};
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// When focus is lost, clear modifiers.
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element.onblur = function() {
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guac_keyboard.modifiers.alt = false;
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guac_keyboard.modifiers.ctrl = false;
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guac_keyboard.modifiers.shift = false;
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};
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};
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