Qt 5.9 | Qt Bluetooth | Bluetooth QML Chat Example | chat.qml Example File

Qt 5.9.9 Reference Documentation

# chat.qml Example File

chat/chat.qml

      /****************************************************************************
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      ** This file is part of the examples of the QtBluetooth module.
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      import QtQuick 2.2
      import QtBluetooth 5.3

      Item {
          id: top

          Component.onCompleted: state = "begin"

          property string remoteDeviceName: ""
          property bool serviceFound: false

          BluetoothDiscoveryModel {
              id: btModel
              running: true
              discoveryMode: BluetoothDiscoveryModel.FullServiceDiscovery
              onRunningChanged : {
                  if (!btModel.running && top.state == "begin" && !serviceFound) {
                      searchBox.animationRunning = false;
                      searchBox.appendText("\nNo service found. \n\nPlease start server\nand restart app.")
                  }
              }

              onErrorChanged: {
                  if (error != BluetoothDiscoveryModel.NoError && !btModel.running) {
                      searchBox.animationRunning = false
                      searchBox.appendText("\n\nDiscovery failed.\nPlease ensure Bluetooth is available.")
                  }
              }

              onServiceDiscovered: {
                  if (serviceFound)
                      return
                  serviceFound = true
                  console.log("Found new service " + service.deviceAddress + " " + service.deviceName + " " + service.serviceName);
                  searchBox.appendText("\nConnecting to server...")
                  remoteDeviceName = service.deviceName
                  socket.setService(service)
              }
              uuidFilter: targetUuid //e8e10f95-1a70-4b27-9ccf-02010264e9c8
          }

          BluetoothSocket {
              id: socket
              connected: true

              onSocketStateChanged: {
                  switch (socketState) {
                      case BluetoothSocket.Unconnected:
                      case BluetoothSocket.NoServiceSet:
                          searchBox.animationRunning = false;
                          searchBox.setText("\nNo connection. \n\nPlease restart app.");
                          top.state = "begin";
                          break;
                      case BluetoothSocket.Connected:
                          console.log("Connected to server ");
                          top.state = "chatActive"; // move to chat UI
                          break;
                      case BluetoothSocket.Connecting:
                      case BluetoothSocket.ServiceLookup:
                      case BluetoothSocket.Closing:
                      case BluetoothSocket.Listening:
                      case BluetoothSocket.Bound:
                          break;
                  }
              }
              onStringDataChanged: {
                  console.log("Received data: " )
                  var data = remoteDeviceName + ": " + socket.stringData;
                  data = data.substring(0, data.indexOf('\n'))
                  chatContent.append({content: data})
                  console.log(data);
              }
              //...
          }

          ListModel {
              id: chatContent
              ListElement {
                  content: "Connected to chat server"
              }
          }

          Rectangle {
              id: background
              z: 0
              anchors.fill: parent
              color: "#5d5b59"
          }

          Search {
              id: searchBox
              anchors.centerIn: top
              opacity: 1
          }

          Rectangle {
              id: chatBox
              opacity: 0
              anchors.centerIn: top

              color: "#5d5b59"
              border.color: "black"
              border.width: 1
              radius: 5
              anchors.fill: parent

              function sendMessage()
              {
                  // toogle focus to force end of input method composer
                  var hasFocus = input.focus;
                  input.focus = false;

                  var data = input.text
                  input.clear()
                  chatContent.append({content: "Me: " + data})
                  socket.stringData = data
                  chatView.positionViewAtEnd()

                  input.focus = hasFocus;
              }

              Item {
                  anchors.fill: parent
                  anchors.margins: 10

                  InputBox {
                      id: input
                      Keys.onReturnPressed: chatBox.sendMessage()
                      height: sendButton.height
                      width: parent.width - sendButton.width - 15
                      anchors.left: parent.left
                  }

                  Button {
                      id: sendButton
                      anchors.right: parent.right
                      label: "Send"
                      onButtonClick: chatBox.sendMessage()
                  }

                  Rectangle {
                      height: parent.height - input.height - 15
                      width: parent.width;
                      color: "#d7d6d5"
                      anchors.bottom: parent.bottom
                      border.color: "black"
                      border.width: 1
                      radius: 5

                      ListView {
                          id: chatView
                          width: parent.width-5
                          height: parent.height-5
                          anchors.centerIn: parent
                          model: chatContent
                          clip: true
                          delegate: Component {
                              Text {
                                  font.pointSize: 14
                                  text: modelData
                              }
                          }
                      }
                  }
              }
          }

          states: [
              State {
                  name: "begin"
                  PropertyChanges { target: searchBox; opacity: 1 }
                  PropertyChanges { target: chatBox; opacity: 0 }
              },
              State {
                  name: "chatActive"
                  PropertyChanges { target: searchBox; opacity: 0 }
                  PropertyChanges { target: chatBox; opacity: 1 }
              }
          ]
      }