fanny-app/qml/main.qml

import QtQuick 2.9
import QtQuick.Controls 2.2

ApplicationWindow {
    id: window
    visible: true
    width: 540
    height: 960

    property bool is_error
    property string error
    property bool initdone: false
    property bool firstinitdone: false

    property string text_color: "black" //"#424753"
    property string background_color: "white"
    property string toolbar_color: "#312f38"

//    onBeforeRendering: {
//        if(!firstinitdone){
//            var isinit = _cppAppSettings.loadSetting("init")
//            console.log("getinit");
//            console.log(isinit);
//            if(isinit === "0"){
//                stackView.push("qrc:/LoginPage.qml", {});
//            }
//        }
//        firstinitdone = true
//    }

    Timer {
        //runs only one time at applictaion lauch
        property bool finished: true
        id: initTimer
        interval: 1;
        running: initdone === false
        repeat: finished
        onTriggered: {
            finished = false
            var init = _cppAppSettings.loadSetting("init")

            var perm = _cppAppSettings.loadSetting("permanent")
            console.log("checkoldlogin:", perm);
            if(perm === "1"){
                console.log("Perm")
                var ret = _cppServerConn.login(_cppAppSettings.loadSetting("username"), _cppAppSettings.loadSetting("password"), true);
                if(ret === "OK"){
                    initdone = true
                    _cppAppSettings.writeSetting("init", 1);
                    if(stackView.currentItem.objectName !== "MainPage"){
                        stackView.push("qrc:/MainPage.qml", {});
                    }
                    window.is_error = false;
                }
                else if(ret === "Keine Verbindung zum Server."){
                    handleError(0)
                    //initTimer.interval = 1000
                    finished = true
                    return
                }

                else {
                    ret = _cppServerConn.checkConn()
                    handleError(ret)
                }
            }
            else {
                initdone = false
                if(stackView.currentItem.objectName !== "LoginPage"){
                    stackView.push("qrc:/LoginPage.qml")
                }
            }
            finished = true
            initdone = true
        }
    }

    Timer {
        id: refreshTimer
        interval: 1000;
        running: initdone
        repeat: true
        onTriggered: {
            console.log("refresh")
            var ret = _cppServerConn.checkConn()
            handleError(ret)
        }
    }

    StackView {
        id: stackView
        initialItem: "MainPage.qml"
        anchors.fill: parent
    }

    function handleError(error_code){
        if(error_code === 200){
            window.is_error = false;
            window.error = "";
        }
        else if(error_code === 401){
            console.warn("401")
            _cppAppSettings.writeSetting("permanent", 0)
            _cppAppSettings.writeSetting("username", "")
            _cppAppSettings.writeSetting("password", "")
            if(["LoginPage"].indexOf(stackView.currentItem.objectName) < 0){
                console.log("switching to login page")
                stackView.push("qrc:/LoginPage.qml");
            }
            window.is_error = true;
            window.error = "Nicht angemeldet!!";
        }
        else if(error_code === 500){
            window.is_error = true;
            window.error = "Interner Server Fehler!";
        }
        else if(error_code === 0){
            window.is_error = true;
            window.error = "Keine Verbindung zum Server!";
        }
        else if(error_code === 404){
            //the testcon function calls a non existent file to be fast, so no error here
            window.is_error = false;
        }
        else if(error_code === 111){
            window.is_error = true;
            window.error = "Unbekannter interner Fehler!";
        }
        else {
            window.is_error = true;
            window.error = "Unbekannter Fehler! ("+error_code+")";
        }
    }
}