qmlchatclient.qml Example File | Qt WebChannel 5.6

Qt 5.6 | Qt WebChannel | Qt WebChannel ChatClient QML Example | qmlchatclient.qml Example File

Qt 5.6.2 Reference Documentation

# qmlchatclient.qml Example File

chatclient-qml/qmlchatclient.qml

      /****************************************************************************
      **
      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Copyright (C) 2014 basysKom GmbH, author Bernd Lamecker <bernd.lamecker@basyskom.com>
      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the QtWebChannel module of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:LGPL21$
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      ** accordance with the commercial license agreement provided with the
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      ** GNU Lesser General Public License Usage
      ** Alternatively, this file may be used under the terms of the GNU Lesser
      ** General Public License version 2.1 or version 3 as published by the Free
      ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
      ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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      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
          }
      }