315 lines
10 KiB
JavaScript
315 lines
10 KiB
JavaScript
/*
|
|
* noVNC: HTML5 VNC client
|
|
* Copyright (C) 2012 Joel Martin
|
|
* Copyright (C) 2013 Samuel Mannehed for Cendio AB
|
|
* Licensed under MPL 2.0 or any later version (see LICENSE.txt)
|
|
*/
|
|
|
|
import * as Log from '../util/logging.js';
|
|
import { stopEvent } from '../util/events.js';
|
|
import * as KeyboardUtil from "./util.js";
|
|
import KeyTable from "./keysym.js";
|
|
import * as browser from "../util/browser.js";
|
|
|
|
//
|
|
// Keyboard event handler
|
|
//
|
|
|
|
export default function Keyboard(target) {
|
|
this._target = target || null;
|
|
|
|
this._keyDownList = {}; // List of depressed keys
|
|
// (even if they are happy)
|
|
this._pendingKey = null; // Key waiting for keypress
|
|
|
|
// keep these here so we can refer to them later
|
|
this._eventHandlers = {
|
|
'keyup': this._handleKeyUp.bind(this),
|
|
'keydown': this._handleKeyDown.bind(this),
|
|
'keypress': this._handleKeyPress.bind(this),
|
|
'blur': this._allKeysUp.bind(this)
|
|
};
|
|
};
|
|
|
|
Keyboard.prototype = {
|
|
// ===== EVENT HANDLERS =====
|
|
|
|
onkeyevent: function () {}, // Handler for key press/release
|
|
|
|
// ===== PRIVATE METHODS =====
|
|
|
|
_sendKeyEvent: function (keysym, code, down) {
|
|
Log.Debug("onkeyevent " + (down ? "down" : "up") +
|
|
", keysym: " + keysym, ", code: " + code);
|
|
|
|
// Windows sends CtrlLeft+AltRight when you press
|
|
// AltGraph, which tends to confuse the hell out of
|
|
// remote systems. Fake a release of these keys until
|
|
// there is a way to detect AltGraph properly.
|
|
var fakeAltGraph = false;
|
|
if (down && browser.isWindows()) {
|
|
if ((code !== 'ControlLeft') &&
|
|
(code !== 'AltRight') &&
|
|
('ControlLeft' in this._keyDownList) &&
|
|
('AltRight' in this._keyDownList)) {
|
|
fakeAltGraph = true;
|
|
this.onkeyevent(this._keyDownList['AltRight'],
|
|
'AltRight', false);
|
|
this.onkeyevent(this._keyDownList['ControlLeft'],
|
|
'ControlLeft', false);
|
|
}
|
|
}
|
|
|
|
this.onkeyevent(keysym, code, down);
|
|
|
|
if (fakeAltGraph) {
|
|
this.onkeyevent(this._keyDownList['ControlLeft'],
|
|
'ControlLeft', true);
|
|
this.onkeyevent(this._keyDownList['AltRight'],
|
|
'AltRight', true);
|
|
}
|
|
},
|
|
|
|
_getKeyCode: function (e) {
|
|
var code = KeyboardUtil.getKeycode(e);
|
|
if (code !== 'Unidentified') {
|
|
return code;
|
|
}
|
|
|
|
// Unstable, but we don't have anything else to go on
|
|
// (don't use it for 'keypress' events thought since
|
|
// WebKit sets it to the same as charCode)
|
|
if (e.keyCode && (e.type !== 'keypress')) {
|
|
// 229 is used for composition events
|
|
if (e.keyCode !== 229) {
|
|
return 'Platform' + e.keyCode;
|
|
}
|
|
}
|
|
|
|
// A precursor to the final DOM3 standard. Unfortunately it
|
|
// is not layout independent, so it is as bad as using keyCode
|
|
if (e.keyIdentifier) {
|
|
// Non-character key?
|
|
if (e.keyIdentifier.substr(0, 2) !== 'U+') {
|
|
return e.keyIdentifier;
|
|
}
|
|
|
|
var codepoint = parseInt(e.keyIdentifier.substr(2), 16);
|
|
var char = String.fromCharCode(codepoint);
|
|
// Some implementations fail to uppercase the symbols
|
|
char = char.toUpperCase();
|
|
|
|
return 'Platform' + char.charCodeAt();
|
|
}
|
|
|
|
return 'Unidentified';
|
|
},
|
|
|
|
_handleKeyDown: function (e) {
|
|
var code = this._getKeyCode(e);
|
|
var keysym = KeyboardUtil.getKeysym(e);
|
|
|
|
// We cannot handle keys we cannot track, but we also need
|
|
// to deal with virtual keyboards which omit key info
|
|
// (iOS omits tracking info on keyup events, which forces us to
|
|
// special treat that platform here)
|
|
if ((code === 'Unidentified') || browser.isIOS()) {
|
|
if (keysym) {
|
|
// If it's a virtual keyboard then it should be
|
|
// sufficient to just send press and release right
|
|
// after each other
|
|
this._sendKeyEvent(keysym, code, true);
|
|
this._sendKeyEvent(keysym, code, false);
|
|
}
|
|
|
|
stopEvent(e);
|
|
return;
|
|
}
|
|
|
|
// Alt behaves more like AltGraph on macOS, so shuffle the
|
|
// keys around a bit to make things more sane for the remote
|
|
// server. This method is used by RealVNC and TigerVNC (and
|
|
// possibly others).
|
|
if (browser.isMac()) {
|
|
switch (keysym) {
|
|
case KeyTable.XK_Super_L:
|
|
keysym = KeyTable.XK_Alt_L;
|
|
break;
|
|
case KeyTable.XK_Super_R:
|
|
keysym = KeyTable.XK_Super_L;
|
|
break;
|
|
case KeyTable.XK_Alt_L:
|
|
keysym = KeyTable.XK_Mode_switch;
|
|
break;
|
|
case KeyTable.XK_Alt_R:
|
|
keysym = KeyTable.XK_ISO_Level3_Shift;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Is this key already pressed? If so, then we must use the
|
|
// same keysym or we'll confuse the server
|
|
if (code in this._keyDownList) {
|
|
keysym = this._keyDownList[code];
|
|
}
|
|
|
|
// macOS doesn't send proper key events for modifiers, only
|
|
// state change events. That gets extra confusing for CapsLock
|
|
// which toggles on each press, but not on release. So pretend
|
|
// it was a quick press and release of the button.
|
|
if (browser.isMac() && (code === 'CapsLock')) {
|
|
this._sendKeyEvent(KeyTable.XK_Caps_Lock, 'CapsLock', true);
|
|
this._sendKeyEvent(KeyTable.XK_Caps_Lock, 'CapsLock', false);
|
|
stopEvent(e);
|
|
return;
|
|
}
|
|
|
|
// If this is a legacy browser then we'll need to wait for
|
|
// a keypress event as well
|
|
// (IE and Edge has a broken KeyboardEvent.key, so we can't
|
|
// just check for the presence of that field)
|
|
if (!keysym && (!e.key || browser.isIE() || browser.isEdge())) {
|
|
this._pendingKey = code;
|
|
// However we might not get a keypress event if the key
|
|
// is non-printable, which needs some special fallback
|
|
// handling
|
|
setTimeout(this._handleKeyPressTimeout.bind(this), 10, e);
|
|
return;
|
|
}
|
|
|
|
this._pendingKey = null;
|
|
stopEvent(e);
|
|
|
|
this._keyDownList[code] = keysym;
|
|
|
|
this._sendKeyEvent(keysym, code, true);
|
|
},
|
|
|
|
// Legacy event for browsers without code/key
|
|
_handleKeyPress: function (e) {
|
|
stopEvent(e);
|
|
|
|
// Are we expecting a keypress?
|
|
if (this._pendingKey === null) {
|
|
return;
|
|
}
|
|
|
|
var code = this._getKeyCode(e);
|
|
var keysym = KeyboardUtil.getKeysym(e);
|
|
|
|
// The key we were waiting for?
|
|
if ((code !== 'Unidentified') && (code != this._pendingKey)) {
|
|
return;
|
|
}
|
|
|
|
code = this._pendingKey;
|
|
this._pendingKey = null;
|
|
|
|
if (!keysym) {
|
|
Log.Info('keypress with no keysym:', e);
|
|
return;
|
|
}
|
|
|
|
this._keyDownList[code] = keysym;
|
|
|
|
this._sendKeyEvent(keysym, code, true);
|
|
},
|
|
_handleKeyPressTimeout: function (e) {
|
|
// Did someone manage to sort out the key already?
|
|
if (this._pendingKey === null) {
|
|
return;
|
|
}
|
|
|
|
var code, keysym;
|
|
|
|
code = this._pendingKey;
|
|
this._pendingKey = null;
|
|
|
|
// We have no way of knowing the proper keysym with the
|
|
// information given, but the following are true for most
|
|
// layouts
|
|
if ((e.keyCode >= 0x30) && (e.keyCode <= 0x39)) {
|
|
// Digit
|
|
keysym = e.keyCode;
|
|
} else if ((e.keyCode >= 0x41) && (e.keyCode <= 0x5a)) {
|
|
// Character (A-Z)
|
|
var char = String.fromCharCode(e.keyCode);
|
|
// A feeble attempt at the correct case
|
|
if (e.shiftKey)
|
|
char = char.toUpperCase();
|
|
else
|
|
char = char.toLowerCase();
|
|
keysym = char.charCodeAt();
|
|
} else {
|
|
// Unknown, give up
|
|
keysym = 0;
|
|
}
|
|
|
|
this._keyDownList[code] = keysym;
|
|
|
|
this._sendKeyEvent(keysym, code, true);
|
|
},
|
|
|
|
_handleKeyUp: function (e) {
|
|
stopEvent(e);
|
|
|
|
var code = this._getKeyCode(e);
|
|
|
|
// See comment in _handleKeyDown()
|
|
if (browser.isMac() && (code === 'CapsLock')) {
|
|
this._sendKeyEvent(KeyTable.XK_Caps_Lock, 'CapsLock', true);
|
|
this._sendKeyEvent(KeyTable.XK_Caps_Lock, 'CapsLock', false);
|
|
return;
|
|
}
|
|
|
|
// Do we really think this key is down?
|
|
if (!(code in this._keyDownList)) {
|
|
return;
|
|
}
|
|
|
|
this._sendKeyEvent(this._keyDownList[code], code, false);
|
|
|
|
delete this._keyDownList[code];
|
|
},
|
|
|
|
_allKeysUp: function () {
|
|
Log.Debug(">> Keyboard.allKeysUp");
|
|
for (var code in this._keyDownList) {
|
|
this._sendKeyEvent(this._keyDownList[code], code, false);
|
|
};
|
|
this._keyDownList = {};
|
|
Log.Debug("<< Keyboard.allKeysUp");
|
|
},
|
|
|
|
// ===== PUBLIC METHODS =====
|
|
|
|
grab: function () {
|
|
//Log.Debug(">> Keyboard.grab");
|
|
var c = this._target;
|
|
|
|
c.addEventListener('keydown', this._eventHandlers.keydown);
|
|
c.addEventListener('keyup', this._eventHandlers.keyup);
|
|
c.addEventListener('keypress', this._eventHandlers.keypress);
|
|
|
|
// Release (key up) if window loses focus
|
|
window.addEventListener('blur', this._eventHandlers.blur);
|
|
|
|
//Log.Debug("<< Keyboard.grab");
|
|
},
|
|
|
|
ungrab: function () {
|
|
//Log.Debug(">> Keyboard.ungrab");
|
|
var c = this._target;
|
|
|
|
c.removeEventListener('keydown', this._eventHandlers.keydown);
|
|
c.removeEventListener('keyup', this._eventHandlers.keyup);
|
|
c.removeEventListener('keypress', this._eventHandlers.keypress);
|
|
window.removeEventListener('blur', this._eventHandlers.blur);
|
|
|
|
// Release (key up) all keys that are in a down state
|
|
this._allKeysUp();
|
|
|
|
//Log.Debug(">> Keyboard.ungrab");
|
|
},
|
|
};
|