qmlchatclient.qml Example File

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  ** Copyright (C) 2016 basysKom GmbH, author Bernd Lamecker <bernd.lamecker@basyskom.com>
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  ** This file is part of the QtWebChannel module of the Qt Toolkit.
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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
      }
  }