Using Python class files in QML

manpreet Best Answer 3 years ago

I have a main.qml file that look like below

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.5


ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    TextField {
        id:textarea
        anchors.centerIn: parent
        Button {
            text: "Click Me"
            anchors.leftMargin: 34
            id:textareabutton
            y: 0
            anchors.left:textarea.right
            onClicked: {
                someclass.say(textarea.text)
            }
        }
    }
    TextField {
        id:textarea2
        anchors.horizontalCenterOffset: 0
        anchors.topMargin: 37
        anchors.top: textarea.bottom
        anchors.horizontalCenter: textarea.horizontalCenter
    }
    Connections {
        target: someclass

        onToPython : {
            textarea2.text = say
        }
    }
}

i have a python class file which i have added using add file option in qtcreator, when i run main.qml i am getting errors related to the classes being undefined as below

qrc:/main.qml:33:5: QML Connections: Cannot assign to non-existent property "onToPython"
qrc:/main.qml:34: ReferenceError: someclass is not defined
qrc:/main.qml:22: ReferenceError: someclass is not defined

I have the external tools configured in the Qt creator for python and when i run through it,it works. However it is not working when i run main.qml. What am i missing, how can i make use of the python class file.

below is the python file that invokes the QML , if i run from python it works, i want to run qml file and invoke this class

import sys
from PyQt5.QtGui import QGuiApplication
from PyQt5.QtQml import QQmlApplicationEngine
from PyQt5.QtCore import QObject,pyqtSignal,pyqtSlot

class someclassr(QObject):
    def __init__(self):
        QObject.__init__(self)

    toPython=pyqtSignal(str, arguments
                                                

                                                                                                        
                                                    
                                                
                                                

                                                    

                                                        
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