- Qt 5.5
- Qt Bluetooth
- Bluetooth QML Chat Example
- chat.qml Example File
- Qt 5.5.1 Reference Documentation

# chat.qml Example File

chat/chat.qml

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the QtBluetooth module.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** 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,
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    ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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    ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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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.MinimalServiceDiscovery
            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: "e8e10f95-1a70-4b27-9ccf-02010264e9c8"
        }

        BluetoothSocket {
            id: socket
            connected: true

            onSocketStateChanged: {
                console.log("Connected to server")
                top.state = "chatActive"
            }
            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 }
            }
        ]
    }