371 lines
13 KiB
JavaScript
371 lines
13 KiB
JavaScript
/*
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* noVNC: HTML5 VNC client
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* Copyright (C) 2018 The noVNC Authors
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* Licensed under MPL 2.0 or any later version (see LICENSE.txt)
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*/
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import * as Log from '../util/logging.js';
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import { stopEvent } from '../util/events.js';
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import * as KeyboardUtil from "./util.js";
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import KeyTable from "./keysym.js";
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import * as browser from "../util/browser.js";
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//
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// Keyboard event handler
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//
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export default class Keyboard {
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constructor(target) {
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this._target = target || null;
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this._keyDownList = {}; // List of depressed keys
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// (even if they are happy)
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this._pendingKey = null; // Key waiting for keypress
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this._altGrArmed = false; // Windows AltGr detection
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// keep these here so we can refer to them later
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this._eventHandlers = {
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'keyup': this._handleKeyUp.bind(this),
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'keydown': this._handleKeyDown.bind(this),
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'keypress': this._handleKeyPress.bind(this),
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'blur': this._allKeysUp.bind(this),
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'checkalt': this._checkAlt.bind(this),
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};
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// ===== EVENT HANDLERS =====
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this.onkeyevent = () => {}; // Handler for key press/release
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}
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// ===== PRIVATE METHODS =====
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_sendKeyEvent(keysym, code, down) {
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if (down) {
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this._keyDownList[code] = keysym;
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} else {
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// Do we really think this key is down?
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if (!(code in this._keyDownList)) {
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return;
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}
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delete this._keyDownList[code];
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}
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Log.Debug("onkeyevent " + (down ? "down" : "up") +
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", keysym: " + keysym, ", code: " + code);
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this.onkeyevent(keysym, code, down);
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}
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_getKeyCode(e) {
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const code = KeyboardUtil.getKeycode(e);
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if (code !== 'Unidentified') {
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return code;
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}
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// Unstable, but we don't have anything else to go on
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// (don't use it for 'keypress' events thought since
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// WebKit sets it to the same as charCode)
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if (e.keyCode && (e.type !== 'keypress')) {
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// 229 is used for composition events
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if (e.keyCode !== 229) {
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return 'Platform' + e.keyCode;
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}
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}
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// A precursor to the final DOM3 standard. Unfortunately it
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// is not layout independent, so it is as bad as using keyCode
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if (e.keyIdentifier) {
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// Non-character key?
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if (e.keyIdentifier.substr(0, 2) !== 'U+') {
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return e.keyIdentifier;
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}
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const codepoint = parseInt(e.keyIdentifier.substr(2), 16);
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const char = String.fromCharCode(codepoint).toUpperCase();
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return 'Platform' + char.charCodeAt();
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}
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return 'Unidentified';
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}
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_handleKeyDown(e) {
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const code = this._getKeyCode(e);
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let keysym = KeyboardUtil.getKeysym(e);
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// Windows doesn't have a proper AltGr, but handles it using
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// fake Ctrl+Alt. However the remote end might not be Windows,
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// so we need to merge those in to a single AltGr event. We
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// detect this case by seeing the two key events directly after
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// each other with a very short time between them (<50ms).
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if (this._altGrArmed) {
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this._altGrArmed = false;
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clearTimeout(this._altGrTimeout);
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if ((code === "AltRight") &&
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((e.timeStamp - this._altGrCtrlTime) < 50)) {
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// FIXME: We fail to detect this if either Ctrl key is
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// first manually pressed as Windows then no
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// longer sends the fake Ctrl down event. It
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// does however happily send real Ctrl events
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// even when AltGr is already down. Some
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// browsers detect this for us though and set the
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// key to "AltGraph".
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keysym = KeyTable.XK_ISO_Level3_Shift;
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} else {
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this._sendKeyEvent(KeyTable.XK_Control_L, "ControlLeft", true);
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}
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}
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// We cannot handle keys we cannot track, but we also need
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// to deal with virtual keyboards which omit key info
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// (iOS omits tracking info on keyup events, which forces us to
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// special treat that platform here)
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if ((code === 'Unidentified') || browser.isIOS()) {
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if (keysym) {
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// If it's a virtual keyboard then it should be
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// sufficient to just send press and release right
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// after each other
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this._sendKeyEvent(keysym, code, true);
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this._sendKeyEvent(keysym, code, false);
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}
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stopEvent(e);
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return;
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}
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// Alt behaves more like AltGraph on macOS, so shuffle the
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// keys around a bit to make things more sane for the remote
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// server. This method is used by RealVNC and TigerVNC (and
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// possibly others).
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if (browser.isMac()) {
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switch (keysym) {
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case KeyTable.XK_Super_L:
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keysym = KeyTable.XK_Alt_L;
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break;
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case KeyTable.XK_Super_R:
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keysym = KeyTable.XK_Super_L;
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break;
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case KeyTable.XK_Alt_L:
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keysym = KeyTable.XK_Mode_switch;
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break;
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case KeyTable.XK_Alt_R:
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keysym = KeyTable.XK_ISO_Level3_Shift;
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break;
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}
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}
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// Is this key already pressed? If so, then we must use the
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// same keysym or we'll confuse the server
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if (code in this._keyDownList) {
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keysym = this._keyDownList[code];
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}
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// macOS doesn't send proper key events for modifiers, only
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// state change events. That gets extra confusing for CapsLock
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// which toggles on each press, but not on release. So pretend
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// it was a quick press and release of the button.
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if (browser.isMac() && (code === 'CapsLock')) {
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this._sendKeyEvent(KeyTable.XK_Caps_Lock, 'CapsLock', true);
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this._sendKeyEvent(KeyTable.XK_Caps_Lock, 'CapsLock', false);
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stopEvent(e);
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return;
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}
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// If this is a legacy browser then we'll need to wait for
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// a keypress event as well
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// (IE and Edge has a broken KeyboardEvent.key, so we can't
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// just check for the presence of that field)
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if (!keysym && (!e.key || browser.isIE() || browser.isEdge())) {
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this._pendingKey = code;
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// However we might not get a keypress event if the key
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// is non-printable, which needs some special fallback
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// handling
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setTimeout(this._handleKeyPressTimeout.bind(this), 10, e);
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return;
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}
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this._pendingKey = null;
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stopEvent(e);
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// Possible start of AltGr sequence? (see above)
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if ((code === "ControlLeft") && browser.isWindows() &&
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!("ControlLeft" in this._keyDownList)) {
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this._altGrArmed = true;
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this._altGrTimeout = setTimeout(this._handleAltGrTimeout.bind(this), 100);
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this._altGrCtrlTime = e.timeStamp;
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return;
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}
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this._sendKeyEvent(keysym, code, true);
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}
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// Legacy event for browsers without code/key
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_handleKeyPress(e) {
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stopEvent(e);
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// Are we expecting a keypress?
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if (this._pendingKey === null) {
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return;
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}
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let code = this._getKeyCode(e);
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const keysym = KeyboardUtil.getKeysym(e);
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// The key we were waiting for?
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if ((code !== 'Unidentified') && (code != this._pendingKey)) {
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return;
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}
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code = this._pendingKey;
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this._pendingKey = null;
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if (!keysym) {
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Log.Info('keypress with no keysym:', e);
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return;
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}
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this._sendKeyEvent(keysym, code, true);
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}
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_handleKeyPressTimeout(e) {
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// Did someone manage to sort out the key already?
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if (this._pendingKey === null) {
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return;
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}
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let keysym;
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const code = this._pendingKey;
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this._pendingKey = null;
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// We have no way of knowing the proper keysym with the
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// information given, but the following are true for most
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// layouts
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if ((e.keyCode >= 0x30) && (e.keyCode <= 0x39)) {
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// Digit
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keysym = e.keyCode;
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} else if ((e.keyCode >= 0x41) && (e.keyCode <= 0x5a)) {
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// Character (A-Z)
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let char = String.fromCharCode(e.keyCode);
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// A feeble attempt at the correct case
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if (e.shiftKey) {
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char = char.toUpperCase();
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} else {
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char = char.toLowerCase();
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}
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keysym = char.charCodeAt();
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} else {
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// Unknown, give up
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keysym = 0;
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}
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this._sendKeyEvent(keysym, code, true);
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}
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_handleKeyUp(e) {
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stopEvent(e);
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const code = this._getKeyCode(e);
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// We can't get a release in the middle of an AltGr sequence, so
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// abort that detection
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if (this._altGrArmed) {
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this._altGrArmed = false;
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clearTimeout(this._altGrTimeout);
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this._sendKeyEvent(KeyTable.XK_Control_L, "ControlLeft", true);
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}
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// See comment in _handleKeyDown()
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if (browser.isMac() && (code === 'CapsLock')) {
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this._sendKeyEvent(KeyTable.XK_Caps_Lock, 'CapsLock', true);
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this._sendKeyEvent(KeyTable.XK_Caps_Lock, 'CapsLock', false);
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return;
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}
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this._sendKeyEvent(this._keyDownList[code], code, false);
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}
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_handleAltGrTimeout() {
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this._altGrArmed = false;
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clearTimeout(this._altGrTimeout);
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this._sendKeyEvent(KeyTable.XK_Control_L, "ControlLeft", true);
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}
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_allKeysUp() {
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Log.Debug(">> Keyboard.allKeysUp");
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for (let code in this._keyDownList) {
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this._sendKeyEvent(this._keyDownList[code], code, false);
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}
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Log.Debug("<< Keyboard.allKeysUp");
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}
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// Firefox Alt workaround, see below
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_checkAlt(e) {
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if (e.altKey) {
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return;
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}
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const target = this._target;
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const downList = this._keyDownList;
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['AltLeft', 'AltRight'].forEach((code) => {
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if (!(code in downList)) {
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return;
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}
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const event = new KeyboardEvent('keyup',
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{ key: downList[code],
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code: code });
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target.dispatchEvent(event);
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});
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}
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// ===== PUBLIC METHODS =====
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grab() {
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//Log.Debug(">> Keyboard.grab");
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this._target.addEventListener('keydown', this._eventHandlers.keydown);
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this._target.addEventListener('keyup', this._eventHandlers.keyup);
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this._target.addEventListener('keypress', this._eventHandlers.keypress);
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// Release (key up) if window loses focus
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window.addEventListener('blur', this._eventHandlers.blur);
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// Firefox has broken handling of Alt, so we need to poll as
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// best we can for releases (still doesn't prevent the menu
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// from popping up though as we can't call preventDefault())
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if (browser.isWindows() && browser.isFirefox()) {
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const handler = this._eventHandlers.checkalt;
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['mousedown', 'mouseup', 'mousemove', 'wheel',
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'touchstart', 'touchend', 'touchmove',
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'keydown', 'keyup'].forEach(type =>
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document.addEventListener(type, handler,
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{ capture: true,
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passive: true }));
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}
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//Log.Debug("<< Keyboard.grab");
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}
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ungrab() {
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//Log.Debug(">> Keyboard.ungrab");
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if (browser.isWindows() && browser.isFirefox()) {
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const handler = this._eventHandlers.checkalt;
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['mousedown', 'mouseup', 'mousemove', 'wheel',
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'touchstart', 'touchend', 'touchmove',
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'keydown', 'keyup'].forEach(type => document.removeEventListener(type, handler));
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}
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this._target.removeEventListener('keydown', this._eventHandlers.keydown);
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this._target.removeEventListener('keyup', this._eventHandlers.keyup);
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this._target.removeEventListener('keypress', this._eventHandlers.keypress);
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window.removeEventListener('blur', this._eventHandlers.blur);
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// Release (key up) all keys that are in a down state
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this._allKeysUp();
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//Log.Debug(">> Keyboard.ungrab");
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}
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}
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