canvas-controller/components/WebSocket.qml

import QtWebSockets 1.0
import QtQuick 2.5

Item {
    property alias tot_slides : socket.total_slides
    function isOpen(){
        return  socket.status == WebSocket.Open;
    }
    function send_obj(obj) {
        socket.sendTextMessage(JSON.stringify(obj))
    }

    function set_preg() {
        send_obj({
                     type: "initpreg"
                 })
    }
    function unset_preg() {
        send_obj({
                     type: "stoppreg"
                 })
    }

    function prev_diapo() {
        var curImage = Math.max(item1.curImage - 1, 1)
        send_obj({
                     type: "command",
                     commandtype: "diapo",
                     PDF: item1.curPDF,
                     slide: curImage
                 })
    }

    function next_diapo() {
        var curImage = Math.min(item1.curImage + 1, tot_slides)
        send_obj({
                     type: "command",
                     commandtype: "diapo",
                     PDF: item1.curPDF,
                     slide: curImage
                 })
    }
    function clear_path() {
        send_obj({
                     type: "command",
                     commandtype: "clean"
                 })
        canvas.clean_path()
    }
    function send_drawing(d) {

        send_obj({
                     type: "command",
                     commandtype: "draw",
                     points: d,
                     color: canvas.curColor
                 })
    }

    WebSocket {
        property int total_slides: 5

        id: socket
        url: "wss://wscasa.especificosba.com.ar"
        active: true

        onTextMessageReceived: {
            var obj = JSON.parse(message)
            switch (obj.type) {
            case "diapo":
                canvas.clean_path()
                item1.curPDF = obj.PDF
                item1.curImage = obj.slide //automagically change_image
                if (obj.total_slides === undefined){
                    console.log(obj);
                    total_slides = 3
                } else {
                    total_slides = obj.total_slides
                }

                break
            case "preg":
                item1.addPreg(obj.text)

                break
            case "deletepreg":
                item1.pregs = []
                break
            case "draw":
                break
            case "snowmix":
                break
            default:
                console.log(JSON.stringify(obj))
            }
        }



        onStatusChanged: {
            if (socket.status == WebSocket.Open) {
                wsStatus.text = qsTr("Conectado")
            } else {
                wsStatus.text = qsTr("Desconectado\nReconectando..")
            }
        }
    }

    Timer {
        interval: 800;
        running: true;
        repeat: true;
        onTriggered: {
            if (socket.status != WebSocket.Open){//Reconnect
                socket.active = false
                socket.active = true
                console.log("Connecting... " +Date().toString())
            }
        }
    }
}