Operation Python objects qml

1. How to get qml objects in python in there?

1.1 Gets the root object

QML:

import QtQuick 2.12
import QtQuick.Controls 2.12

ApplicationWindow {
    id: window
    width: 250
    height: 500
    visible: true

    // ...
}

Python:

The method of using rootObjects QQmlApplicationEngine class.

engine = QQmlApplicationEngine()
engine.load('qml-test.qml')
root_obj = engine.rootObjects()[0]

This will get the window as ApplicationWindow object id.

1.2 acquire any object

ObjecName need to add properties in qml file!
QML:

import QtQuick 2.12
import QtQuick.Controls 2.12

ApplicationWindow {
    id: window
    width: 250
    height: 500
    visible: true
    
    Text {
        id: txt
        objectName: "txt"
        text: "Click Me"
        font.pixelSize: 20
        anchors.centerIn: parent
    }
}

Python:

engine = QQmlApplicationEngine()
engine.load('qml-test.qml')
txt_obj = engine.rootObjects()[0].findChild(QObject, "txt")

 

2. how to read and set properties and values ​​qml objects in python in?

2.1 reads the object's properties (such as Text Object)

Firstly findChild get Text object (note txt is qml documents in the objectName):

txt_obj = engine.rootObjects()[0].findChild(QObject, "txt")

Text object and then get the text attributes (using the  Property ):

txt_value = txt_obj.property("text")

2.2 Setting attribute of the object

Use setProperty method can change the object's property value.

txt_obj.setProperty("text", "Clicked!")

 

Complete code:

import sys

from PyQt5.QtCore import QObject
from PyQt5.QtGui import QGuiApplication
from PyQt5.QtQml import QQmlApplicationEngine

app = QGuiApplication(sys.argv)
engine = QQmlApplicationEngine()
engine.load('qml-test.qml')

# 根对象
root_obj = engine.rootObjects()[0]

# Text对象
txt_obj = engine.rootObjects()[0].findChild(QObject, "txt")

# 读取属性值
txt_value = txt_obj.property("text")

# 设置属性值
txt_obj.setProperty("text", "Clicked!")

sys.exit(app.exec())

 

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