Passing arguments from PySide2 to QML.

pleaseHelpSteve

Hi all,
I'm current trying to figure out how to use Python with QT QML. So far I have been successful in passing info from QML to python with no problems, however after much searching and frustration I have not been able to go from Python to QML.

So I'm currently using
Python code:
valfeedback = Signal(float, name = "pos")
self.valfeedback.emit(self.m_currentValue)
QML
Connections {
target: Manager

    onValfeedback: {

        label.text = Manager.pos
    }
}

}

But this just complains about Error: Cannot assign [undefined] to QString But I'm not sure how it is supposed to be defined???

I'm sure that I'm missing something really simple but have spent hours on this with no results - Please help........

My sample code below..

import sys
import os

from PySide2.QtCore import Qt, QObject, Signal, Slot, Property
from PySide2.QtGui import QGuiApplication
from PySide2.QtQml import QQmlApplicationEngine

class Manager(QObject):

def __init__(self):
    QObject.__init__(self)
    self.m_currentValue = 3.4
    self.m_buttonValue = 0
    self.labelInfo = "47"

valfeedback = Signal(float, name = "pos")

@Property(float)
def currentValue(self):
   return self.m_currentValue
@currentValue.setter
def setCurrentValue(self, val):
    if self.m_currentValue == val:
        return
    self.m_currentValue = val
    print(self.m_currentValue)
    self.valfeedback.emit(self.m_currentValue)


@Property(int)
def buttonValue(self):
    return self.m_buttonValue
@buttonValue.setter
def setButtonValue(self, val):
    self.m_buttonValue = val
    print(val)

if name == "main":
os.environ["QT_QUICK_CONTROLS_STYLE"] = "Material"
app = QGuiApplication(sys.argv)
engine = QQmlApplicationEngine()
manager = Manager()
ctx = engine.rootContext()
ctx.setContextProperty("Manager", manager)
engine.load('view4.qml')
if not engine.rootObjects():
sys.exit(-1)

sys.exit(app.exec_())

import QtQuick 2.10
import QtQuick.Controls 2.3
import QtQuick.Layouts 1.0

ApplicationWindow {
id: applicationWindow

title: qsTr("Test Invoke")
visible: true

width: 600
height: 500

Slider {
    id: slider
    x: 78
    y: 330
    width: 444
    height: 40
    value: 0.5
    property bool updateValueWhileDragging: false
    onMoved: Manager.currentValue = value
}

Button {
    id: button
    x: 250
    y: 230
    text: qsTr("Press Me Please")
    checkable: true
    onPressed: Manager.buttonValue = 1
}


Label {
    id: label
    x: 37
    y: 65
    horizontalAlignment: Text.AlignHCenter
    font.pointSize: 35
}

Connections {
    target: Manager

    onValfeedback: {

        label.text = Manager.pos
    }
}

}

dadara

@pleaseHelpSteve: What worked for me is using QStringModel as described here https://stackoverflow.com/questions/50609986/how-to-connect-python-and-qml-with-pyside2 (or here http://doc.qt.io/qt-5/qtquick-modelviewsdata-cppmodels.html)