fanny-app/qml/main.qml

import QtQuick 2.9
import QtQuick.Controls 2.2

import "./Components"
import "./Forms"
import "./Pages"

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

    Item {
        id: app

        anchors.fill: parent

        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"

        state: "loggedIn"

        states: [
            State {
                name: "notLoggedIn"
                PropertyChanges {
                    target: mainStack
                    currPage: loginPage
                }
            },

            State {
                name: "loggedIn"
                PropertyChanges {
                    target: mainStack
                    currPage: mainPage
                }
            }
        ]

//        onBeforeRendering: {
//            if(!firstinitdone){
//                var isinit = _cppAppSettings.loadSetting("permanent")
//                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: true
            repeat: false
            onTriggered: {
                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"){
                        app.initdone = true
                        _cppAppSettings.writeSetting("init", 1);
                        if(app.state !== "loggedIn"){
                            app.state = "loggedIn"
                        }
                        app.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 {
                    app.initdone = false
                    if(app.state !== "notLoggedIn"){
                        app.state = "notLoggedIn"
                    }
                }
                app.initdone = true
            }
        }

        Timer {
            id: refreshTimer
            interval: 1000;
            running: app.initdone && app.state !== "notLoggedIn"
            repeat: true
            onTriggered: {
                var ret = _cppServerConn.checkConn()
                app.handleError(ret)
            }
        }

        StackView {
            id: mainStack

            property var currPage

            anchors.fill: parent

            onCurrPageChanged: {
                mainStack.replace(currPage)
            }

            //initialItem: mainPage

            Component {
                id: loginPage
                LoginPage {}
            }

            Component {
                id: mainPage
                MainPage {}
            }
        }

        function handleError(error_code){
            if(error_code === 200){
                app.is_error = false;
                app.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("./Pages/LoginPage.qml");
                }
                app.is_error = true;
                app.error = "Nicht angemeldet!!";
            }
            else if(error_code === 500){
                app.is_error = true;
                app.error = "Interner Server Fehler!";
            }
            else if(error_code === 0){
                app.is_error = true;
                app.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
                app.is_error = false;
            }
            else if(error_code === 111){
                app.is_error = true;
                app.error = "Unbekannter interner Fehler!";
            }
            else {
                app.is_error = true;
                app.error = "Unbekannter Fehler! ("+error_code+")";
            }
        }

    }
}