428 lines
15 KiB
JavaScript
428 lines
15 KiB
JavaScript
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/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Copyright (C) 2016 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Milian Wolff <milian.wolff@kdab.com>
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the QtWebChannel module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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"use strict";
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var QWebChannelMessageTypes = {
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signal: 1,
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propertyUpdate: 2,
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init: 3,
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idle: 4,
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debug: 5,
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invokeMethod: 6,
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connectToSignal: 7,
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disconnectFromSignal: 8,
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setProperty: 9,
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response: 10,
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};
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var QWebChannel = function(transport, initCallback)
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{
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if (typeof transport !== "object" || typeof transport.send !== "function") {
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console.error("The QWebChannel expects a transport object with a send function and onmessage callback property." +
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" Given is: transport: " + typeof(transport) + ", transport.send: " + typeof(transport.send));
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return;
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}
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var channel = this;
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this.transport = transport;
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this.send = function(data)
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{
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if (typeof(data) !== "string") {
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data = JSON.stringify(data);
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}
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channel.transport.send(data);
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}
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this.transport.onmessage = function(message)
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{
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var data = message.data;
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if (typeof data === "string") {
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data = JSON.parse(data);
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}
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switch (data.type) {
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case QWebChannelMessageTypes.signal:
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channel.handleSignal(data);
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break;
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case QWebChannelMessageTypes.response:
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channel.handleResponse(data);
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break;
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case QWebChannelMessageTypes.propertyUpdate:
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channel.handlePropertyUpdate(data);
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break;
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default:
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console.error("invalid message received:", message.data);
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break;
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}
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}
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this.execCallbacks = {};
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this.execId = 0;
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this.exec = function(data, callback)
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{
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if (!callback) {
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// if no callback is given, send directly
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channel.send(data);
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return;
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}
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if (channel.execId === Number.MAX_VALUE) {
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// wrap
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channel.execId = Number.MIN_VALUE;
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}
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if (data.hasOwnProperty("id")) {
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console.error("Cannot exec message with property id: " + JSON.stringify(data));
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return;
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}
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data.id = channel.execId++;
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channel.execCallbacks[data.id] = callback;
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channel.send(data);
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};
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this.objects = {};
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this.handleSignal = function(message)
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{
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var object = channel.objects[message.object];
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if (object) {
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object.signalEmitted(message.signal, message.args);
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} else {
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console.warn("Unhandled signal: " + message.object + "::" + message.signal);
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}
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}
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this.handleResponse = function(message)
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{
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if (!message.hasOwnProperty("id")) {
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console.error("Invalid response message received: ", JSON.stringify(message));
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return;
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}
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channel.execCallbacks[message.id](message.data);
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delete channel.execCallbacks[message.id];
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}
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this.handlePropertyUpdate = function(message)
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{
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for (var i in message.data) {
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var data = message.data[i];
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var object = channel.objects[data.object];
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if (object) {
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object.propertyUpdate(data.signals, data.properties);
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} else {
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console.warn("Unhandled property update: " + data.object + "::" + data.signal);
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}
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}
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channel.exec({type: QWebChannelMessageTypes.idle});
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}
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this.debug = function(message)
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{
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channel.send({type: QWebChannelMessageTypes.debug, data: message});
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};
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channel.exec({type: QWebChannelMessageTypes.init}, function(data) {
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for (var objectName in data) {
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var object = new QObject(objectName, data[objectName], channel);
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}
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// now unwrap properties, which might reference other registered objects
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for (var objectName in channel.objects) {
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channel.objects[objectName].unwrapProperties();
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}
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if (initCallback) {
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initCallback(channel);
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}
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channel.exec({type: QWebChannelMessageTypes.idle});
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});
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};
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function QObject(name, data, webChannel)
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{
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this.__id__ = name;
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webChannel.objects[name] = this;
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// List of callbacks that get invoked upon signal emission
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this.__objectSignals__ = {};
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// Cache of all properties, updated when a notify signal is emitted
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this.__propertyCache__ = {};
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var object = this;
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// ----------------------------------------------------------------------
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this.unwrapQObject = function(response)
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{
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if (response instanceof Array) {
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// support list of objects
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var ret = new Array(response.length);
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for (var i = 0; i < response.length; ++i) {
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ret[i] = object.unwrapQObject(response[i]);
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}
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return ret;
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}
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if (!response
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|| !response["__QObject*__"]
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|| response.id === undefined) {
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return response;
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}
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var objectId = response.id;
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if (webChannel.objects[objectId])
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return webChannel.objects[objectId];
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if (!response.data) {
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console.error("Cannot unwrap unknown QObject " + objectId + " without data.");
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return;
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}
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var qObject = new QObject( objectId, response.data, webChannel );
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qObject.destroyed.connect(function() {
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if (webChannel.objects[objectId] === qObject) {
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delete webChannel.objects[objectId];
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// reset the now deleted QObject to an empty {} object
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// just assigning {} though would not have the desired effect, but the
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// below also ensures all external references will see the empty map
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// NOTE: this detour is necessary to workaround QTBUG-40021
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var propertyNames = [];
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for (var propertyName in qObject) {
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propertyNames.push(propertyName);
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}
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for (var idx in propertyNames) {
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delete qObject[propertyNames[idx]];
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}
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}
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});
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// here we are already initialized, and thus must directly unwrap the properties
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qObject.unwrapProperties();
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return qObject;
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}
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this.unwrapProperties = function()
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{
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for (var propertyIdx in object.__propertyCache__) {
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object.__propertyCache__[propertyIdx] = object.unwrapQObject(object.__propertyCache__[propertyIdx]);
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}
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}
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function addSignal(signalData, isPropertyNotifySignal)
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{
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var signalName = signalData[0];
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var signalIndex = signalData[1];
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object[signalName] = {
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connect: function(callback) {
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if (typeof(callback) !== "function") {
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console.error("Bad callback given to connect to signal " + signalName);
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return;
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}
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object.__objectSignals__[signalIndex] = object.__objectSignals__[signalIndex] || [];
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object.__objectSignals__[signalIndex].push(callback);
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if (!isPropertyNotifySignal && signalName !== "destroyed") {
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// only required for "pure" signals, handled separately for properties in propertyUpdate
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// also note that we always get notified about the destroyed signal
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webChannel.exec({
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type: QWebChannelMessageTypes.connectToSignal,
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object: object.__id__,
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signal: signalIndex
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});
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}
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},
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disconnect: function(callback) {
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if (typeof(callback) !== "function") {
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console.error("Bad callback given to disconnect from signal " + signalName);
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return;
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}
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object.__objectSignals__[signalIndex] = object.__objectSignals__[signalIndex] || [];
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var idx = object.__objectSignals__[signalIndex].indexOf(callback);
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if (idx === -1) {
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console.error("Cannot find connection of signal " + signalName + " to " + callback.name);
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return;
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}
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object.__objectSignals__[signalIndex].splice(idx, 1);
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if (!isPropertyNotifySignal && object.__objectSignals__[signalIndex].length === 0) {
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// only required for "pure" signals, handled separately for properties in propertyUpdate
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webChannel.exec({
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type: QWebChannelMessageTypes.disconnectFromSignal,
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object: object.__id__,
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signal: signalIndex
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});
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}
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}
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};
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}
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/**
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* Invokes all callbacks for the given signalname. Also works for property notify callbacks.
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*/
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function invokeSignalCallbacks(signalName, signalArgs)
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{
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var connections = object.__objectSignals__[signalName];
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if (connections) {
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connections.forEach(function(callback) {
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callback.apply(callback, signalArgs);
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});
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}
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}
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this.propertyUpdate = function(signals, propertyMap)
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{
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// update property cache
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for (var propertyIndex in propertyMap) {
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var propertyValue = propertyMap[propertyIndex];
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object.__propertyCache__[propertyIndex] = propertyValue;
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}
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for (var signalName in signals) {
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// Invoke all callbacks, as signalEmitted() does not. This ensures the
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// property cache is updated before the callbacks are invoked.
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invokeSignalCallbacks(signalName, signals[signalName]);
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}
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}
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this.signalEmitted = function(signalName, signalArgs)
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{
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invokeSignalCallbacks(signalName, this.unwrapQObject(signalArgs));
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}
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function addMethod(methodData)
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{
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var methodName = methodData[0];
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var methodIdx = methodData[1];
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object[methodName] = function() {
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var args = [];
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var callback;
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for (var i = 0; i < arguments.length; ++i) {
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var argument = arguments[i];
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if (typeof argument === "function")
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callback = argument;
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else if (argument instanceof QObject && webChannel.objects[argument.__id__] !== undefined)
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args.push({
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"id": argument.__id__
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});
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else
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args.push(argument);
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}
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webChannel.exec({
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"type": QWebChannelMessageTypes.invokeMethod,
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"object": object.__id__,
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"method": methodIdx,
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"args": args
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}, function(response) {
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if (response !== undefined) {
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var result = object.unwrapQObject(response);
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if (callback) {
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(callback)(result);
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}
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}
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});
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};
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}
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function bindGetterSetter(propertyInfo)
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{
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var propertyIndex = propertyInfo[0];
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var propertyName = propertyInfo[1];
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var notifySignalData = propertyInfo[2];
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// initialize property cache with current value
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// NOTE: if this is an object, it is not directly unwrapped as it might
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// reference other QObject that we do not know yet
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object.__propertyCache__[propertyIndex] = propertyInfo[3];
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if (notifySignalData) {
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if (notifySignalData[0] === 1) {
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// signal name is optimized away, reconstruct the actual name
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notifySignalData[0] = propertyName + "Changed";
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}
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addSignal(notifySignalData, true);
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}
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Object.defineProperty(object, propertyName, {
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configurable: true,
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get: function () {
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var propertyValue = object.__propertyCache__[propertyIndex];
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if (propertyValue === undefined) {
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// This shouldn't happen
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console.warn("Undefined value in property cache for property \"" + propertyName + "\" in object " + object.__id__);
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}
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return propertyValue;
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},
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set: function(value) {
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if (value === undefined) {
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console.warn("Property setter for " + propertyName + " called with undefined value!");
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
object.__propertyCache__[propertyIndex] = value;
|
||
|
|
var valueToSend = value;
|
||
|
|
if (valueToSend instanceof QObject && webChannel.objects[valueToSend.__id__] !== undefined)
|
||
|
|
valueToSend = { "id": valueToSend.__id__ };
|
||
|
|
webChannel.exec({
|
||
|
|
"type": QWebChannelMessageTypes.setProperty,
|
||
|
|
"object": object.__id__,
|
||
|
|
"property": propertyIndex,
|
||
|
|
"value": valueToSend
|
||
|
|
});
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
// ----------------------------------------------------------------------
|
||
|
|
|
||
|
|
data.methods.forEach(addMethod);
|
||
|
|
|
||
|
|
data.properties.forEach(bindGetterSetter);
|
||
|
|
|
||
|
|
data.signals.forEach(function(signal) { addSignal(signal, false); });
|
||
|
|
|
||
|
|
for (var name in data.enums) {
|
||
|
|
object[name] = data.enums[name];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//required for use with nodejs
|
||
|
|
if (typeof module === 'object') {
|
||
|
|
module.exports = {
|
||
|
|
QWebChannel: QWebChannel
|
||
|
|
};
|
||
|
|
}
|