QML使用Python的函数过程解析

signal mySignal(string my_string)

onClicked:{
  root.mySignal("hello world")
}

engine.rootObjects()[0].mySignal.connect(my_func) # 这里的mySignal是在QML里定义的

import QtQuick 2.12
import QtQuick.Controls 2.12

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

  signal mySignal(string my_string)

  MouseArea {
    id: mouse_area
    anchors.fill: parent
    onClicked: {
      root.mySignal("hello world")
    }
  }
}

from PyQt5.QtCore import QObject
from PyQt5.QtGui import QGuiApplication
from PyQt5.QtQml import QQmlApplicationEngine
import sys
class MyWindow(QObject):
  def __init__(self):
    super().__init__()
    self.engine = QQmlApplicationEngine()
    self.engine.load('qml-test.qml')

    # root signal
    my_obj = self.engine.rootObjects()[0]
    my_obj.mySignal.connect(self.my_func)

  def my_func(self, my_string):
    print(my_string)
if __name__ == '__main__':
  app = QGuiApplication(sys.argv)
  window = MyWindow()
  sys.exit(app.exec())

class Person(QObject):
  def __init__(self):
    super().__init__()

  @pyqtSlot() # 注意是槽函数！
  def begin(self):
    print('begin')

person = Person()
engine.rootContext().setContextProperty('person', person)

from PyQt5.QtGui import QGuiApplication
from PyQt5.QtQml import QQmlApplicationEngine
from PyQt5.QtCore import QObject, pyqtSlot
import sys
class Person(QObject):
  def __init__(self):
    super().__init__()

  @pyqtSlot() # 注意是槽函数！
  def begin(self):
    print('begin')
if __name__ == '__main__':
  app = QGuiApplication(sys.argv)
  engine = QQmlApplicationEngine()

  person = Person()
  engine.rootContext().setContextProperty('person', person)

  engine.load('qml-test.qml')
  sys.exit(app.exec())

import QtQuick 2.12
import QtQuick.Controls 2.12

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

  Button{
      text:qsTr("begin")
      onClicked: {
        person.begin()
      }
  }
}