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Diffstat (limited to 'net/webrtc/gstwebrtc-api/third-party/Keyboard.js')
| -rw-r--r-- | net/webrtc/gstwebrtc-api/third-party/Keyboard.js | 1511 |
1 files changed, 1511 insertions, 0 deletions
diff --git a/net/webrtc/gstwebrtc-api/third-party/Keyboard.js b/net/webrtc/gstwebrtc-api/third-party/Keyboard.js new file mode 100644 index 00000000..e55541e5 --- /dev/null +++ b/net/webrtc/gstwebrtc-api/third-party/Keyboard.js @@ -0,0 +1,1511 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ + +const Guacamole = {}; +export { Guacamole as default }; + +/** + * Provides cross-browser and cross-keyboard keyboard for a specific element. + * Browser and keyboard layout variation is abstracted away, providing events + * which represent keys as their corresponding X11 keysym. + * + * @constructor + * @param {Element|Document} [element] + * The Element to use to provide keyboard events. If omitted, at least one + * Element must be manually provided through the listenTo() function for + * the Guacamole.Keyboard instance to have any effect. + */ +Guacamole.Keyboard = function Keyboard(element) { + + /** + * Reference to this Guacamole.Keyboard. + * + * @private + * @type {!Guacamole.Keyboard} + */ + var guac_keyboard = this; + + /** + * An integer value which uniquely identifies this Guacamole.Keyboard + * instance with respect to other Guacamole.Keyboard instances. + * + * @private + * @type {!number} + */ + var guacKeyboardID = Guacamole.Keyboard._nextID++; + + /** + * The name of the property which is added to event objects via markEvent() + * to note that they have already been handled by this Guacamole.Keyboard. + * + * @private + * @constant + * @type {!string} + */ + var EVENT_MARKER = '_GUAC_KEYBOARD_HANDLED_BY_' + guacKeyboardID; + + /** + * Fired whenever the user presses a key with the element associated + * with this Guacamole.Keyboard in focus. + * + * @event + * @param {!number} keysym + * The keysym of the key being pressed. + * + * @return {!boolean} + * true if the key event should be allowed through to the browser, + * false otherwise. + */ + this.onkeydown = null; + + /** + * Fired whenever the user releases a key with the element associated + * with this Guacamole.Keyboard in focus. + * + * @event + * @param {!number} keysym + * The keysym of the key being released. + */ + this.onkeyup = null; + + /** + * Set of known platform-specific or browser-specific quirks which must be + * accounted for to properly interpret key events, even if the only way to + * reliably detect that quirk is to platform/browser-sniff. + * + * @private + * @type {!Object.<string, boolean>} + */ + var quirks = { + + /** + * Whether keyup events are universally unreliable. + * + * @type {!boolean} + */ + keyupUnreliable: false, + + /** + * Whether the Alt key is actually a modifier for typable keys and is + * thus never used for keyboard shortcuts. + * + * @type {!boolean} + */ + altIsTypableOnly: false, + + /** + * Whether we can rely on receiving a keyup event for the Caps Lock + * key. + * + * @type {!boolean} + */ + capsLockKeyupUnreliable: false + + }; + + // Set quirk flags depending on platform/browser, if such information is + // available + if (navigator && navigator.platform) { + + // All keyup events are unreliable on iOS (sadly) + if (navigator.platform.match(/ipad|iphone|ipod/i)) + quirks.keyupUnreliable = true; + + // The Alt key on Mac is never used for keyboard shortcuts, and the + // Caps Lock key never dispatches keyup events + else if (navigator.platform.match(/^mac/i)) { + quirks.altIsTypableOnly = true; + quirks.capsLockKeyupUnreliable = true; + } + + } + + /** + * A key event having a corresponding timestamp. This event is non-specific. + * Its subclasses should be used instead when recording specific key + * events. + * + * @private + * @constructor + * @param {KeyboardEvent} [orig] + * The relevant DOM keyboard event. + */ + var KeyEvent = function KeyEvent(orig) { + + /** + * Reference to this key event. + * + * @private + * @type {!KeyEvent} + */ + var key_event = this; + + /** + * The JavaScript key code of the key pressed. For most events (keydown + * and keyup), this is a scancode-like value related to the position of + * the key on the US English "Qwerty" keyboard. For keypress events, + * this is the Unicode codepoint of the character that would be typed + * by the key pressed. + * + * @type {!number} + */ + this.keyCode = orig ? (orig.which || orig.keyCode) : 0; + + /** + * The legacy DOM3 "keyIdentifier" of the key pressed, as defined at: + * http://www.w3.org/TR/2009/WD-DOM-Level-3-Events-20090908/#events-Events-KeyboardEvent + * + * @type {!string} + */ + this.keyIdentifier = orig && orig.keyIdentifier; + + /** + * The standard name of the key pressed, as defined at: + * http://www.w3.org/TR/DOM-Level-3-Events/#events-KeyboardEvent + * + * @type {!string} + */ + this.key = orig && orig.key; + + /** + * The location on the keyboard corresponding to the key pressed, as + * defined at: + * http://www.w3.org/TR/DOM-Level-3-Events/#events-KeyboardEvent + * + * @type {!number} + */ + this.location = orig ? getEventLocation(orig) : 0; + + /** + * The state of all local keyboard modifiers at the time this event was + * received. + * + * @type {!Guacamole.Keyboard.ModifierState} + */ + this.modifiers = orig ? Guacamole.Keyboard.ModifierState.fromKeyboardEvent(orig) : new Guacamole.Keyboard.ModifierState(); + + /** + * An arbitrary timestamp in milliseconds, indicating this event's + * position in time relative to other events. + * + * @type {!number} + */ + this.timestamp = new Date().getTime(); + + /** + * Whether the default action of this key event should be prevented. + * + * @type {!boolean} + */ + this.defaultPrevented = false; + + /** + * The keysym of the key associated with this key event, as determined + * by a best-effort guess using available event properties and keyboard + * state. + * + * @type {number} + */ + this.keysym = null; + + /** + * Whether the keysym value of this key event is known to be reliable. + * If false, the keysym may still be valid, but it's only a best guess, + * and future key events may be a better source of information. + * + * @type {!boolean} + */ + this.reliable = false; + + /** + * Returns the number of milliseconds elapsed since this event was + * received. + * + * @return {!number} + * The number of milliseconds elapsed since this event was + * received. + */ + this.getAge = function() { + return new Date().getTime() - key_event.timestamp; + }; + + }; + + /** + * Information related to the pressing of a key, which need not be a key + * associated with a printable character. The presence or absence of any + * information within this object is browser-dependent. + * + * @private + * @constructor + * @augments Guacamole.Keyboard.KeyEvent + * @param {!KeyboardEvent} orig + * The relevant DOM "keydown" event. + */ + var KeydownEvent = function KeydownEvent(orig) { + + // We extend KeyEvent + KeyEvent.call(this, orig); + + // If key is known from keyCode or DOM3 alone, use that + this.keysym = keysym_from_key_identifier(this.key, this.location) + || keysym_from_keycode(this.keyCode, this.location); + + /** + * Whether the keyup following this keydown event is known to be + * reliable. If false, we cannot rely on the keyup event to occur. + * + * @type {!boolean} + */ + this.keyupReliable = !quirks.keyupUnreliable; + + // DOM3 and keyCode are reliable sources if the corresponding key is + // not a printable key + if (this.keysym && !isPrintable(this.keysym)) + this.reliable = true; + + // Use legacy keyIdentifier as a last resort, if it looks sane + if (!this.keysym && key_identifier_sane(this.keyCode, this.keyIdentifier)) + this.keysym = keysym_from_key_identifier(this.keyIdentifier, this.location, this.modifiers.shift); + + // If a key is pressed while meta is held down, the keyup will + // never be sent in Chrome (bug #108404) + if (this.modifiers.meta && this.keysym !== 0xFFE7 && this.keysym !== 0xFFE8) + this.keyupReliable = false; + + // We cannot rely on receiving keyup for Caps Lock on certain platforms + else if (this.keysym === 0xFFE5 && quirks.capsLockKeyupUnreliable) + this.keyupReliable = false; + + // Determine whether default action for Alt+combinations must be prevented + var prevent_alt = !this.modifiers.ctrl && !quirks.altIsTypableOnly; + + // Determine whether default action for Ctrl+combinations must be prevented + var prevent_ctrl = !this.modifiers.alt; + + // We must rely on the (potentially buggy) keyIdentifier if preventing + // the default action is important + if ((prevent_ctrl && this.modifiers.ctrl) + || (prevent_alt && this.modifiers.alt) + || this.modifiers.meta + || this.modifiers.hyper) + this.reliable = true; + + // Record most recently known keysym by associated key code + recentKeysym[this.keyCode] = this.keysym; + + }; + + KeydownEvent.prototype = new KeyEvent(); + + /** + * Information related to the pressing of a key, which MUST be + * associated with a printable character. The presence or absence of any + * information within this object is browser-dependent. + * + * @private + * @constructor + * @augments Guacamole.Keyboard.KeyEvent + * @param {!KeyboardEvent} orig + * The relevant DOM "keypress" event. + */ + var KeypressEvent = function KeypressEvent(orig) { + + // We extend KeyEvent + KeyEvent.call(this, orig); + + // Pull keysym from char code + this.keysym = keysym_from_charcode(this.keyCode); + + // Keypress is always reliable + this.reliable = true; + + }; + + KeypressEvent.prototype = new KeyEvent(); + + /** + * Information related to the releasing of a key, which need not be a key + * associated with a printable character. The presence or absence of any + * information within this object is browser-dependent. + * + * @private + * @constructor + * @augments Guacamole.Keyboard.KeyEvent + * @param {!KeyboardEvent} orig + * The relevant DOM "keyup" event. + */ + var KeyupEvent = function KeyupEvent(orig) { + + // We extend KeyEvent + KeyEvent.call(this, orig); + + // If key is known from keyCode or DOM3 alone, use that (keyCode is + // still more reliable for keyup when dead keys are in use) + this.keysym = keysym_from_keycode(this.keyCode, this.location) + || keysym_from_key_identifier(this.key, this.location); + + // Fall back to the most recently pressed keysym associated with the + // keyCode if the inferred key doesn't seem to actually be pressed + if (!guac_keyboard.pressed[this.keysym]) + this.keysym = recentKeysym[this.keyCode] || this.keysym; + + // Keyup is as reliable as it will ever be + this.reliable = true; + + }; + + KeyupEvent.prototype = new KeyEvent(); + + /** + * An array of recorded events, which can be instances of the private + * KeydownEvent, KeypressEvent, and KeyupEvent classes. + * + * @private + * @type {!KeyEvent[]} + */ + var eventLog = []; + + /** + * Map of known JavaScript keycodes which do not map to typable characters + * to their X11 keysym equivalents. + * + * @private + * @type {!Object.<number, number[]>} + */ + var keycodeKeysyms = { + 8: [0xFF08], // backspace + 9: [0xFF09], // tab + 12: [0xFF0B, 0xFF0B, 0xFF0B, 0xFFB5], // clear / KP 5 + 13: [0xFF0D], // enter + 16: [0xFFE1, 0xFFE1, 0xFFE2], // shift + 17: [0xFFE3, 0xFFE3, 0xFFE4], // ctrl + 18: [0xFFE9, 0xFFE9, 0xFE03], // alt + 19: [0xFF13], // pause/break + 20: [0xFFE5], // caps lock + 27: [0xFF1B], // escape + 32: [0x0020], // space + 33: [0xFF55, 0xFF55, 0xFF55, 0xFFB9], // page up / KP 9 + 34: [0xFF56, 0xFF56, 0xFF56, 0xFFB3], // page down / KP 3 + 35: [0xFF57, 0xFF57, 0xFF57, 0xFFB1], // end / KP 1 + 36: [0xFF50, 0xFF50, 0xFF50, 0xFFB7], // home / KP 7 + 37: [0xFF51, 0xFF51, 0xFF51, 0xFFB4], // left arrow / KP 4 + 38: [0xFF52, 0xFF52, 0xFF52, 0xFFB8], // up arrow / KP 8 + 39: [0xFF53, 0xFF53, 0xFF53, 0xFFB6], // right arrow / KP 6 + 40: [0xFF54, 0xFF54, 0xFF54, 0xFFB2], // down arrow / KP 2 + 45: [0xFF63, 0xFF63, 0xFF63, 0xFFB0], // insert / KP 0 + 46: [0xFFFF, 0xFFFF, 0xFFFF, 0xFFAE], // delete / KP decimal + 91: [0xFFE7], // left windows/command key (meta_l) + 92: [0xFFE8], // right window/command key (meta_r) + 93: [0xFF67], // menu key + 96: [0xFFB0], // KP 0 + 97: [0xFFB1], // KP 1 + 98: [0xFFB2], // KP 2 + 99: [0xFFB3], // KP 3 + 100: [0xFFB4], // KP 4 + 101: [0xFFB5], // KP 5 + 102: [0xFFB6], // KP 6 + 103: [0xFFB7], // KP 7 + 104: [0xFFB8], // KP 8 + 105: [0xFFB9], // KP 9 + 106: [0xFFAA], // KP multiply + 107: [0xFFAB], // KP add + 109: [0xFFAD], // KP subtract + 110: [0xFFAE], // KP decimal + 111: [0xFFAF], // KP divide + 112: [0xFFBE], // f1 + 113: [0xFFBF], // f2 + 114: [0xFFC0], // f3 + 115: [0xFFC1], // f4 + 116: [0xFFC2], // f5 + 117: [0xFFC3], // f6 + 118: [0xFFC4], // f7 + 119: [0xFFC5], // f8 + 120: [0xFFC6], // f9 + 121: [0xFFC7], // f10 + 122: [0xFFC8], // f11 + 123: [0xFFC9], // f12 + 144: [0xFF7F], // num lock + 145: [0xFF14], // scroll lock + 225: [0xFE03] // altgraph (iso_level3_shift) + }; + + /** + * Map of known JavaScript keyidentifiers which do not map to typable + * characters to their unshifted X11 keysym equivalents. + * + * @private + * @type {!Object.<string, number[]>} + */ + var keyidentifier_keysym = { + "Again": [0xFF66], + "AllCandidates": [0xFF3D], + "Alphanumeric": [0xFF30], + "Alt": [0xFFE9, 0xFFE9, 0xFE03], + "Attn": [0xFD0E], + "AltGraph": [0xFE03], + "ArrowDown": [0xFF54], + "ArrowLeft": [0xFF51], + "ArrowRight": [0xFF53], + "ArrowUp": [0xFF52], + "Backspace": [0xFF08], + "CapsLock": [0xFFE5], + "Cancel": [0xFF69], + "Clear": [0xFF0B], + "Convert": [0xFF21], + "Copy": [0xFD15], + "Crsel": [0xFD1C], + "CrSel": [0xFD1C], + "CodeInput": [0xFF37], + "Compose": [0xFF20], + "Control": [0xFFE3, 0xFFE3, 0xFFE4], + "ContextMenu": [0xFF67], + "Delete": [0xFFFF], + "Down": [0xFF54], + "End": [0xFF57], + "Enter": [0xFF0D], + "EraseEof": [0xFD06], + "Escape": [0xFF1B], + "Execute": [0xFF62], + "Exsel": [0xFD1D], + "ExSel": [0xFD1D], + "F1": [0xFFBE], + "F2": [0xFFBF], + "F3": [0xFFC0], + "F4": [0xFFC1], + "F5": [0xFFC2], + "F6": [0xFFC3], + "F7": [0xFFC4], + "F8": [0xFFC5], + "F9": [0xFFC6], + "F10": [0xFFC7], + "F11": [0xFFC8], + "F12": [0xFFC9], + "F13": [0xFFCA], + "F14": [0xFFCB], + "F15": [0xFFCC], + "F16": [0xFFCD], + "F17": [0xFFCE], + "F18": [0xFFCF], + "F19": [0xFFD0], + "F20": [0xFFD1], + "F21": [0xFFD2], + "F22": [0xFFD3], + "F23": [0xFFD4], + "F24": [0xFFD5], + "Find": [0xFF68], + "GroupFirst": [0xFE0C], + "GroupLast": [0xFE0E], + "GroupNext": [0xFE08], + "GroupPrevious": [0xFE0A], + "FullWidth": null, + "HalfWidth": null, + "HangulMode": [0xFF31], + "Hankaku": [0xFF29], + "HanjaMode": [0xFF34], + "Help": [0xFF6A], + "Hiragana": [0xFF25], + "HiraganaKatakana": [0xFF27], + "Home": [0xFF50], + "Hyper": [0xFFED, 0xFFED, 0xFFEE], + "Insert": [0xFF63], + "JapaneseHiragana": [0xFF25], + "JapaneseKatakana": [0xFF26], + "JapaneseRomaji": [0xFF24], + "JunjaMode": [0xFF38], + "KanaMode": [0xFF2D], + "KanjiMode": [0xFF21], + "Katakana": [0xFF26], + "Left": [0xFF51], + "Meta": [0xFFE7, 0xFFE7, 0xFFE8], + "ModeChange": [0xFF7E], + "NumLock": [0xFF7F], + "PageDown": [0xFF56], + "PageUp": [0xFF55], + "Pause": [0xFF13], + "Play": [0xFD16], + "PreviousCandidate": [0xFF3E], + "PrintScreen": [0xFF61], + "Redo": [0xFF66], + "Right": [0xFF53], + "RomanCharacters": null, + "Scroll": [0xFF14], + "Select": [0xFF60], + "Separator": [0xFFAC], + "Shift": [0xFFE1, 0xFFE1, 0xFFE2], + "SingleCandidate": [0xFF3C], + "Super": [0xFFEB, 0xFFEB, 0xFFEC], + "Tab": [0xFF09], + "UIKeyInputDownArrow": [0xFF54], + "UIKeyInputEscape": [0xFF1B], + "UIKeyInputLeftArrow": [0xFF51], + "UIKeyInputRightArrow": [0xFF53], + "UIKeyInputUpArrow": [0xFF52], + "Up": [0xFF52], + "Undo": [0xFF65], + "Win": [0xFFE7, 0xFFE7, 0xFFE8], + "Zenkaku": [0xFF28], + "ZenkakuHankaku": [0xFF2A] + }; + + /** + * All keysyms which should not repeat when held down. + * + * @private + * @type {!Object.<number, boolean>} + */ + var no_repeat = { + 0xFE03: true, // ISO Level 3 Shift (AltGr) + 0xFFE1: true, // Left shift + 0xFFE2: true, // Right shift + 0xFFE3: true, // Left ctrl + 0xFFE4: true, // Right ctrl + 0xFFE5: true, // Caps Lock + 0xFFE7: true, // Left meta + 0xFFE8: true, // Right meta + 0xFFE9: true, // Left alt + 0xFFEA: true, // Right alt + 0xFFEB: true, // Left super/hyper + 0xFFEC: true // Right super/hyper + }; + + /** + * All modifiers and their states. + * + * @type {!Guacamole.Keyboard.ModifierState} + */ + this.modifiers = new Guacamole.Keyboard.ModifierState(); + + /** + * The state of every key, indexed by keysym. If a particular key is + * pressed, the value of pressed for that keysym will be true. If a key + * is not currently pressed, it will not be defined. + * + * @type {!Object.<number, boolean>} + */ + this.pressed = {}; + + /** + * The state of every key, indexed by keysym, for strictly those keys whose + * status has been indirectly determined thorugh observation of other key + * events. If a particular key is implicitly pressed, the value of + * implicitlyPressed for that keysym will be true. If a key + * is not currently implicitly pressed (the key is not pressed OR the state + * of the key is explicitly known), it will not be defined. + * + * @private + * @type {!Object.<number, boolean>} + */ + var implicitlyPressed = {}; + + /** + * The last result of calling the onkeydown handler for each key, indexed + * by keysym. This is used to prevent/allow default actions for key events, + * even when the onkeydown handler cannot be called again because the key + * is (theoretically) still pressed. + * + * @private + * @type {!Object.<number, boolean>} + */ + var last_keydown_result = {}; + + /** + * The keysym most recently associated with a given keycode when keydown + * fired. This object maps keycodes to keysyms. + * + * @private + * @type {!Object.<number, number>} + */ + var recentKeysym = {}; + + /** + * Timeout before key repeat starts. + * + * @private + * @type {number} + */ + var key_repeat_timeout = null; + + /** + * Interval which presses and releases the last key pressed while that + * key is still being held down. + * + * @private + * @type {number} + */ + var key_repeat_interval = null; + + /** + * Given an array of keysyms indexed by location, returns the keysym + * for the given location, or the keysym for the standard location if + * undefined. + * + * @private + * @param {number[]} keysyms + * An array of keysyms, where the index of the keysym in the array is + * the location value. + * + * @param {!number} location + * The location on the keyboard corresponding to the key pressed, as + * defined at: http://www.w3.org/TR/DOM-Level-3-Events/#events-KeyboardEvent + */ + var get_keysym = function get_keysym(keysyms, location) { + + if (!keysyms) + return null; + + return keysyms[location] || keysyms[0]; + }; + + /** + * Returns true if the given keysym corresponds to a printable character, + * false otherwise. + * + * @param {!number} keysym + * The keysym to check. + * + * @returns {!boolean} + * true if the given keysym corresponds to a printable character, + * false otherwise. + */ + var isPrintable = function isPrintable(keysym) { + + // Keysyms with Unicode equivalents are printable + return (keysym >= 0x00 && keysym <= 0xFF) + || (keysym & 0xFFFF0000) === 0x01000000; + + }; + + function keysym_from_key_identifier(identifier, location, shifted) { + + if (!identifier) + return null; + + var typedCharacter; + + // If identifier is U+xxxx, decode Unicode character + var unicodePrefixLocation = identifier.indexOf("U+"); + if (unicodePrefixLocation >= 0) { + var hex = identifier.substring(unicodePrefixLocation+2); + typedCharacter = String.fromCharCode(parseInt(hex, 16)); + } + + // If single character and not keypad, use that as typed character + else if (identifier.length === 1 && location !== 3) + typedCharacter = identifier; + + // Otherwise, look up corresponding keysym + else + return get_keysym(keyidentifier_keysym[identifier], location); + + // Alter case if necessary + if (shifted === true) + typedCharacter = typedCharacter.toUpperCase(); + else if (shifted === false) + typedCharacter = typedCharacter.toLowerCase(); + + // Get codepoint + var codepoint = typedCharacter.charCodeAt(0); + return keysym_from_charcode(codepoint); + + } + + function isControlCharacter(codepoint) { + return codepoint <= 0x1F || (codepoint >= 0x7F && codepoint <= 0x9F); + } + + function keysym_from_charcode(codepoint) { + + // Keysyms for control characters + if (isControlCharacter(codepoint)) return 0xFF00 | codepoint; + + // Keysyms for ASCII chars + if (codepoint >= 0x0000 && codepoint <= 0x00FF) + return codepoint; + + // Keysyms for Unicode + if (codepoint >= 0x0100 && codepoint <= 0x10FFFF) + return 0x01000000 | codepoint; + + return null; + + } + + function keysym_from_keycode(keyCode, location) { + return get_keysym(keycodeKeysyms[keyCode], location); + } + + /** + * Heuristically detects if the legacy keyIdentifier property of + * a keydown/keyup event looks incorrectly derived. Chrome, and + * presumably others, will produce the keyIdentifier by assuming + * the keyCode is the Unicode codepoint for that key. This is not + * correct in all cases. + * + * @private + * @param {!number} keyCode + * The keyCode from a browser keydown/keyup event. + * + * @param {string} keyIdentifier + * The legacy keyIdentifier from a browser keydown/keyup event. + * + * @returns {!boolean} + * true if the keyIdentifier looks sane, false if the keyIdentifier + * appears incorrectly derived or is missing entirely. + */ + var key_identifier_sane = function key_identifier_sane(keyCode, keyIdentifier) { + + // Missing identifier is not sane + if (!keyIdentifier) + return false; + + // Assume non-Unicode keyIdentifier values are sane + var unicodePrefixLocation = keyIdentifier.indexOf("U+"); + if (unicodePrefixLocation === -1) + return true; + + // If the Unicode codepoint isn't identical to the keyCode, + // then the identifier is likely correct + var codepoint = parseInt(keyIdentifier.substring(unicodePrefixLocation+2), 16); + if (keyCode !== codepoint) + return true; + + // The keyCodes for A-Z and 0-9 are actually identical to their + // Unicode codepoints + if ((keyCode >= 65 && keyCode <= 90) || (keyCode >= 48 && keyCode <= 57)) + return true; + + // The keyIdentifier does NOT appear sane + return false; + + }; + + /** + * Marks a key as pressed, firing the keydown event if registered. Key + * repeat for the pressed key will start after a delay if that key is + * not a modifier. The return value of this function depends on the + * return value of the keydown event handler, if any. + * + * @param {number} keysym + * The keysym of the key to press. + * + * @return {boolean} + * true if event should NOT be canceled, false otherwise. + */ + this.press = function(keysym) { + + // Don't bother with pressing the key if the key is unknown + if (keysym === null) return; + + // Only press if released + if (!guac_keyboard.pressed[keysym]) { + + // Mark key as pressed + guac_keyboard.pressed[keysym] = true; + + // Send key event + if (guac_keyboard.onkeydown) { + var result = guac_keyboard.onkeydown(keysym); + last_keydown_result[keysym] = result; + + // Stop any current repeat + window.clearTimeout(key_repeat_timeout); + window.clearInterval(key_repeat_interval); + + // Repeat after a delay as long as pressed + if (!no_repeat[keysym]) + key_repeat_timeout = window.setTimeout(function() { + key_repeat_interval = window.setInterval(function() { + guac_keyboard.onkeyup(keysym); + guac_keyboard.onkeydown(keysym); + }, 50); + }, 500); + + return result; + } + } + + // Return the last keydown result by default, resort to false if unknown + return last_keydown_result[keysym] || false; + + }; + + /** + * Marks a key as released, firing the keyup event if registered. + * + * @param {number} keysym + * The keysym of the key to release. + */ + this.release = function(keysym) { + + // Only release if pressed + if (guac_keyboard.pressed[keysym]) { + + // Mark key as released + delete guac_keyboard.pressed[keysym]; + delete implicitlyPressed[keysym]; + + // Stop repeat + window.clearTimeout(key_repeat_timeout); + window.clearInterval(key_repeat_interval); + + // Send key event + if (keysym !== null && guac_keyboard.onkeyup) + guac_keyboard.onkeyup(keysym); + + } + + }; + + /** + * Presses and releases the keys necessary to type the given string of + * text. + * + * @param {!string} str + * The string to type. + */ + this.type = function type(str) { + + // Press/release the key corresponding to each character in the string + for (var i = 0; i < str.length; i++) { + + // Determine keysym of current character + var codepoint = str.codePointAt ? str.codePointAt(i) : str.charCodeAt(i); + var keysym = keysym_from_charcode(codepoint); + + // Press and release key for current character + guac_keyboard.press(keysym); + guac_keyboard.release(keysym); + + } + + }; + + /** + * Resets the state of this keyboard, releasing all keys, and firing keyup + * events for each released key. + */ + this.reset = function() { + + // Release all pressed keys + for (var keysym in guac_keyboard.pressed) + guac_keyboard.release(parseInt(keysym)); + + // Clear event log + eventLog = []; + + }; + + /** + * Resynchronizes the remote state of the given modifier with its + * corresponding local modifier state, as dictated by + * {@link KeyEvent#modifiers} within the given key event, by pressing or + * releasing keysyms. + * + * @private + * @param {!string} modifier + * The name of the {@link Guacamole.Keyboard.ModifierState} property + * being updated. + * + * @param {!number[]} keysyms + * The keysyms which represent the modifier being updated. + * + * @param {!KeyEvent} keyEvent + * Guacamole's current best interpretation of the key event being + * processed. + */ + var updateModifierState = function updateModifierState(modifier, + keysyms, keyEvent) { + + var localState = keyEvent.modifiers[modifier]; + var remoteState = guac_keyboard.modifiers[modifier]; + + var i; + + // Do not trust changes in modifier state for events directly involving + // that modifier: (1) the flag may erroneously be cleared despite + // another version of the same key still being held and (2) the change + // in flag may be due to the current event being processed, thus + // updating things here is at best redundant and at worst incorrect + if (keysyms.indexOf(keyEvent.keysym) !== -1) + return; + + // Release all related keys if modifier is implicitly released + if (remoteState && localState === false) { + for (i = 0; i < keysyms.length; i++) { + guac_keyboard.release(keysyms[i]); + } + } + + // Press if modifier is implicitly pressed + else if (!remoteState && localState) { + + // Verify that modifier flag isn't already pressed or already set + // due to another version of the same key being held down + for (i = 0; i < keysyms.length; i++) { + if (guac_keyboard.pressed[keysyms[i]]) + return; + } + + // Mark as implicitly pressed only if there is other information + // within the key event relating to a different key. Some + // platforms, such as iOS, will send essentially empty key events + // for modifier keys, using only the modifier flags to signal the + // identity of the key. + var keysym = keysyms[0]; + if (keyEvent.keysym) + implicitlyPressed[keysym] = true; + + guac_keyboard.press(keysym); + + } + + }; + + /** + * Given a keyboard event, updates the remote key state to match the local + * modifier state and remote based on the modifier flags within the event. + * This function pays no attention to keycodes. + * + * @private + * @param {!KeyEvent} keyEvent + * Guacamole's current best interpretation of the key event being + * processed. + */ + var syncModifierStates = function syncModifierStates(keyEvent) { + + // Resync state of alt + updateModifierState('alt', [ + 0xFFE9, // Left alt + 0xFFEA, // Right alt + 0xFE03 // AltGr + ], keyEvent); + + // Resync state of shift + updateModifierState('shift', [ + 0xFFE1, // Left shift + 0xFFE2 // Right shift + ], keyEvent); + + // Resync state of ctrl + updateModifierState('ctrl', [ + 0xFFE3, // Left ctrl + 0xFFE4 // Right ctrl + ], keyEvent); + + // Resync state of meta + updateModifierState('meta', [ + 0xFFE7, // Left meta + 0xFFE8 // Right meta + ], keyEvent); + + // Resync state of hyper + updateModifierState('hyper', [ + 0xFFEB, // Left super/hyper + 0xFFEC // Right super/hyper + ], keyEvent); + + // Update state + guac_keyboard.modifiers = keyEvent.modifiers; + + }; + + /** + * Returns whether all currently pressed keys were implicitly pressed. A + * key is implicitly pressed if its status was inferred indirectly from + * inspection of other key events. + * + * @private + * @returns {!boolean} + * true if all currently pressed keys were implicitly pressed, false + * otherwise. + */ + var isStateImplicit = function isStateImplicit() { + + for (var keysym in guac_keyboard.pressed) { + if (!implicitlyPressed[keysym]) + return false; + } + + return true; + + }; + + /** + * Reads through the event log, removing events from the head of the log + * when the corresponding true key presses are known (or as known as they + * can be). + * + * @private + * @return {boolean} + * Whether the default action of the latest event should be prevented. + */ + function interpret_events() { + + // Do not prevent default if no event could be interpreted + var handled_event = interpret_event(); + if (!handled_event) + return false; + + // Interpret as much as possible + var last_event; + do { + last_event = handled_event; + handled_event = interpret_event(); + } while (handled_event !== null); + + // Reset keyboard state if we cannot expect to receive any further + // keyup events + if (isStateImplicit()) + guac_keyboard.reset(); + + return last_event.defaultPrevented; + + } + + /** + * Releases Ctrl+Alt, if both are currently pressed and the given keysym + * looks like a key that may require AltGr. + * + * @private + * @param {!number} keysym + * The key that was just pressed. + */ + var release_simulated_altgr = function release_simulated_altgr(keysym) { + + // Both Ctrl+Alt must be pressed if simulated AltGr is in use + if (!guac_keyboard.modifiers.ctrl || !guac_keyboard.modifiers.alt) + return; + + // Assume [A-Z] never require AltGr + if (keysym >= 0x0041 && keysym <= 0x005A) + return; + + // Assume [a-z] never require AltGr + if (keysym >= 0x0061 && keysym <= 0x007A) + return; + + // Release Ctrl+Alt if the keysym is printable + if (keysym <= 0xFF || (keysym & 0xFF000000) === 0x01000000) { + guac_keyboard.release(0xFFE3); // Left ctrl + guac_keyboard.release(0xFFE4); // Right ctrl + guac_keyboard.release(0xFFE9); // Left alt + guac_keyboard.release(0xFFEA); // Right alt + } + + }; + + /** + * Reads through the event log, interpreting the first event, if possible, + * and returning that event. If no events can be interpreted, due to a + * total lack of events or the need for more events, null is returned. Any + * interpreted events are automatically removed from the log. + * + * @private + * @return {KeyEvent} + * The first key event in the log, if it can be interpreted, or null + * otherwise. + */ + var interpret_event = function interpret_event() { + + // Peek at first event in log + var first = eventLog[0]; + if (!first) + return null; + + // Keydown event + if (first instanceof KeydownEvent) { + + var keysym = null; + var accepted_events = []; + + // Defer handling of Meta until it is known to be functioning as a + // modifier (it may otherwise actually be an alternative method for + // pressing a single key, such as Meta+Left for Home on ChromeOS) + if (first.keysym === 0xFFE7 || first.keysym === 0xFFE8) { + + // Defer handling until further events exist to provide context + if (eventLog.length === 1) + return null; + + // Drop keydown if it turns out Meta does not actually apply + if (eventLog[1].keysym !== first.keysym) { + if (!eventLog[1].modifiers.meta) + return eventLog.shift(); + } + + // Drop duplicate keydown events while waiting to determine + // whether to acknowledge Meta (browser may repeat keydown + // while the key is held) + else if (eventLog[1] instanceof KeydownEvent) + return eventLog.shift(); + + } + + // If event itself is reliable, no need to wait for other events + if (first.reliable) { + keysym = first.keysym; + accepted_events = eventLog.splice(0, 1); + } + + // If keydown is immediately followed by a keypress, use the indicated character + else if (eventLog[1] instanceof KeypressEvent) { + keysym = eventLog[1].keysym; + accepted_events = eventLog.splice(0, 2); + } + + // If keydown is immediately followed by anything else, then no + // keypress can possibly occur to clarify this event, and we must + // handle it now + else if (eventLog[1]) { + keysym = first.keysym; + accepted_events = eventLog.splice(0, 1); + } + + // Fire a key press if valid events were found + if (accepted_events.length > 0) { + + syncModifierStates(first); + + if (keysym) { + + // Fire event + release_simulated_altgr(keysym); + var defaultPrevented = !guac_keyboard.press(keysym); + recentKeysym[first.keyCode] = keysym; + + // Release the key now if we cannot rely on the associated + // keyup event + if (!first.keyupReliable) + guac_keyboard.release(keysym); + + // Record whether default was prevented + for (var i=0; i<accepted_events.length; i++) + accepted_events[i].defaultPrevented = defaultPrevented; + + } + + return first; + + } + + } // end if keydown + + // Keyup event + else if (first instanceof KeyupEvent && !quirks.keyupUnreliable) { + + // Release specific key if known + var keysym = first.keysym; + if (keysym) { + guac_keyboard.release(keysym); + delete recentKeysym[first.keyCode]; + first.defaultPrevented = true; + } + + // Otherwise, fall back to releasing all keys + else { + guac_keyboard.reset(); + return first; + } + + syncModifierStates(first); + return eventLog.shift(); + + } // end if keyup + + // Ignore any other type of event (keypress by itself is invalid, and + // unreliable keyup events should simply be dumped) + else + return eventLog.shift(); + + // No event interpreted + return null; + + }; + + /** + * Returns the keyboard location of the key associated with the given + * keyboard event. The location differentiates key events which otherwise + * have the same keycode, such as left shift vs. right shift. + * + * @private + * @param {!KeyboardEvent} e + * A JavaScript keyboard event, as received through the DOM via a + * "keydown", "keyup", or "keypress" handler. + * + * @returns {!number} + * The location of the key event on the keyboard, as defined at: + * http://www.w3.org/TR/DOM-Level-3-Events/#events-KeyboardEvent + */ + var getEventLocation = function getEventLocation(e) { + + // Use standard location, if possible + if ('location' in e) + return e.location; + + // Failing that, attempt to use deprecated keyLocation + if ('keyLocation' in e) + return e.keyLocation; + + // If no location is available, assume left side + return 0; + + }; + + /** + * Attempts to mark the given Event as having been handled by this + * Guacamole.Keyboard. If the Event has already been marked as handled, + * false is returned. + * + * @param {!Event} e + * The Event to mark. + * + * @returns {!boolean} + * true if the given Event was successfully marked, false if the given + * Event was already marked. + */ + var markEvent = function markEvent(e) { + + // Fail if event is already marked + if (e[EVENT_MARKER]) + return false; + + // Mark event otherwise + e[EVENT_MARKER] = true; + return true; + + }; + + /** + * Attaches event listeners to the given Element, automatically translating + * received key, input, and composition events into simple keydown/keyup + * events signalled through this Guacamole.Keyboard's onkeydown and + * onkeyup handlers. + * + * @param {!(Element|Document)} element + * The Element to attach event listeners to for the sake of handling + * key or input events. + */ + this.listenTo = function listenTo(element) { + + // When key pressed + element.addEventListener("keydown", function(e) { + + // Only intercept if handler set + if (!guac_keyboard.onkeydown) return; + + // Ignore events which have already been handled + if (!markEvent(e)) return; + + var keydownEvent = new KeydownEvent(e); + + // Ignore (but do not prevent) the "composition" keycode sent by some + // browsers when an IME is in use (see: http://lists.w3.org/Archives/Public/www-dom/2010JulSep/att-0182/keyCode-spec.html) + if (keydownEvent.keyCode === 229) + return; + + // Log event + eventLog.push(keydownEvent); + + // Interpret as many events as possible, prevent default if indicated + if (interpret_events()) + e.preventDefault(); + + }, true); + + // When key pressed + element.addEventListener("keypress", function(e) { + + // Only intercept if handler set + if (!guac_keyboard.onkeydown && !guac_keyboard.onkeyup) return; + + // Ignore events which have already been handled + if (!markEvent(e)) return; + + // Log event + eventLog.push(new KeypressEvent(e)); + + // Interpret as many events as possible, prevent default if indicated + if (interpret_events()) + e.preventDefault(); + + }, true); + + // When key released + element.addEventListener("keyup", function(e) { + + // Only intercept if handler set + if (!guac_keyboard.onkeyup) return; + + // Ignore events which have already been handled + if (!markEvent(e)) return; + + e.preventDefault(); + + // Log event, call for interpretation + eventLog.push(new KeyupEvent(e)); + interpret_events(); + + }, true); + + /** + * Handles the given "input" event, typing the data within the input text. + * If the event is complete (text is provided), handling of "compositionend" + * events is suspended, as such events may conflict with input events. + * + * @private + * @param {!InputEvent} e + * The "input" event to handle. + */ + var handleInput = function handleInput(e) { + + // Only intercept if handler set + if (!guac_keyboard.onkeydown && !guac_keyboard.onkeyup) return; + + // Ignore events which have already been handled + if (!markEvent(e)) return; + + // Type all content written + if (e.data && !e.isComposing) { + element.removeEventListener("compositionend", handleComposition, false); + guac_keyboard.type(e.data); + } + + }; + + /** + * Handles the given "compositionend" event, typing the data within the + * composed text. If the event is complete (composed text is provided), + * handling of "input" events is suspended, as such events may conflict + * with composition events. + * + * @private + * @param {!CompositionEvent} e + * The "compositionend" event to handle. + */ + var handleComposition = function handleComposition(e) { + + // Only intercept if handler set + if (!guac_keyboard.onkeydown && !guac_keyboard.onkeyup) return; + + // Ignore events which have already been handled + if (!markEvent(e)) return; + + // Type all content written + if (e.data) { + element.removeEventListener("input", handleInput, false); + guac_keyboard.type(e.data); + } + + }; + + // Automatically type text entered into the wrapped field + element.addEventListener("input", handleInput, false); + element.addEventListener("compositionend", handleComposition, false); + + }; + + // Listen to given element, if any + if (element) + guac_keyboard.listenTo(element); + +}; + +/** + * The unique numerical identifier to assign to the next Guacamole.Keyboard + * instance. + * + * @private + * @type {!number} + */ +Guacamole.Keyboard._nextID = 0; + +/** + * The state of all supported keyboard modifiers. + * @constructor + */ +Guacamole.Keyboard.ModifierState = function() { + + /** + * Whether shift is currently pressed. + * + * @type {!boolean} + */ + this.shift = false; + + /** + * Whether ctrl is currently pressed. + * + * @type {!boolean} + */ + this.ctrl = false; + + /** + * Whether alt is currently pressed. + * + * @type {!boolean} + */ + this.alt = false; + + /** + * Whether meta (apple key) is currently pressed. + * + * @type {!boolean} + */ + this.meta = false; + + /** + * Whether hyper (windows key) is currently pressed. + * + * @type {!boolean} + */ + this.hyper = false; + +}; + +/** + * Returns the modifier state applicable to the keyboard event given. + * + * @param {!KeyboardEvent} e + * The keyboard event to read. + * + * @returns {!Guacamole.Keyboard.ModifierState} + * The current state of keyboard modifiers. + */ +Guacamole.Keyboard.ModifierState.fromKeyboardEvent = function(e) { + + var state = new Guacamole.Keyboard.ModifierState(); + + // Assign states from old flags + state.shift = e.shiftKey; + state.ctrl = e.ctrlKey; + state.alt = e.altKey; + state.meta = e.metaKey; + + // Use DOM3 getModifierState() for others + if (e.getModifierState) { + state.hyper = e.getModifierState("OS") + || e.getModifierState("Super") + || e.getModifierState("Hyper") + || e.getModifierState("Win"); + } + + return state; + +}; |