qmlchatclient.qml Example File

chatclient-qml/qmlchatclient.qml
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Copyright (C) 2016 basysKom GmbH, author Bernd Lamecker <[email protected]>
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtWebChannel module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

import QtQuick 2.2
import QtQuick.Controls 1.1
import QtQuick.Window 2.0
import QtQuick.Layouts 1.1
import Qt.WebSockets 1.0
import "qwebchannel.js" as WebChannel

ApplicationWindow {
    id: root
    title: qsTr("Hello World")
    width: 640
    height: 480

    property var channel;

    WebSocket {
        id: socket

        url: "ws://localhost:12345";
        active: false

        // the following three properties/functions are required to align the QML WebSocket API with the HTML5 WebSocket API.
        property var send: function (arg) {
            sendTextMessage(arg);
        }

        onTextMessageReceived: {
            onmessage({data: message});
        }
        property var onmessage;

        onStatusChanged: if (socket.status == WebSocket.Error) {
                             console.error("Error: " + socket.errorString)
                         } else if (socket.status == WebSocket.Closed) {
                             messageBox.text += "\nSocket closed"
                         } else if (socket.status == WebSocket.Open) {
                             //open the webchannel with the socket as transport
                             new WebChannel.QWebChannel(socket, function(ch) {
                                 root.channel = ch;

                                 //connect to the changed signal of the userList property
                                 ch.objects.chatserver.userListChanged.connect(function(args) {
                                     userlist.text = '';
                                     ch.objects.chatserver.userList.forEach(function(user) {
                                         userlist.text += user + '\n';
                                     });
                                 });
                                 //connect to the newMessage signal
                                 ch.objects.chatserver.newMessage.connect(function(time, user, message) {
                                     chat.text = chat.text + "[" + time + "] " + user + ": " +  message + '\n';
                                 });
                                 //connect to the keep alive signal
                                 ch.objects.chatserver.keepAlive.connect(function(args) {
                                     if (loginName.text !== '')
                                         //and call the keep alive response method as an answer
                                         ch.objects.chatserver.keepAliveResponse(loginName.text)
                                });
                            });
                         }
    }

    GridLayout {
        id: grid
        columns: 2
        anchors.fill: parent
        Text {
            id: chat
            text: ""
            Layout.fillHeight: true
            Layout.fillWidth: true
        }

        Text {
            id: userlist
            text: ""
            width: 150
            Layout.fillHeight: true
        }
        TextField {
            id: message
            height: 50
            Layout.columnSpan: 2
            Layout.fillWidth: true

            onEditingFinished: {
                if (message.text.length)
                    //call the sendMessage method to send the message
                    root.channel.objects.chatserver.sendMessage(loginName.text, message.text);
                message.text = '';
            }
        }
    }

    Window {
       id: loginWindow;
       title: "Login";
       modality: Qt.ApplicationModal

       TextField {
           id: loginName

           anchors.top: parent.top
           anchors.horizontalCenter: parent.horizontalCenter
       }
       Button {
           anchors.top: loginName.bottom
           anchors.horizontalCenter: parent.horizontalCenter
           id: loginButton
           text: "Login"

           onClicked: {
               //call the login method
               root.channel.objects.chatserver.login(loginName.text, function(arg) {
                   //check the return value for success
                   if (arg === true) {
                       loginError.visible = false;
                       loginWindow.close();
                   } else {
                       loginError.visible = true;
                   }
               });

           }
       }
       Text {
           id: loginError
           anchors.top: loginButton.bottom
           anchors.horizontalCenter: parent.horizontalCenter
           text: "Name already in use"
           visible: false;
       }
    }

    Component.onCompleted: {
        loginWindow.show();
        socket.active = true; //connect
    }
}

© 2017 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.