📚03.QObject-对象的父子关系

制心一处，无事不办

from PyQt5.Qt import *

class Window(QWidget):
def init(self):
super(Window, self).init()
self.setWindowTitle(‘’)
self.resize(500, 500)
self.setupui()
def setup_ui(self):
#对象的父子关系操作
_self.QObject对象的父子操作()
pass
def QObject对象的父子操作(self):
obj0 = QObject()
obj1 = QObject()
obj2 = QObject()
obj2.setObjectName(“2”)
obj3 = QObject()
obj4 = QObject()
obj5 = QObject()

    print(**'obj0'**,obj0)<br />        print(**'obj1'**, obj1)<br />        print(**'obj2'**, obj2)<br />        print(**'obj3'**, obj3)<br />        print(**'obj4'**, obj4)<br />        print(**'obj5'**, obj5)
    _#设置父对象<br />        _obj1.setParent(obj0)<br />        obj2.setParent(obj0)<br />        obj3.setParent(obj1)<br />        obj4.setParent(obj2)<br />        obj5.setParent(obj2)
    _#返回父对象<br />        _print(obj1.parent())<br />        _#返回所有直接子对象,不递归<br />        _print(obj0.children())<br />        _#默认返回第一个子对象,但可以指定name返回指定的子对象<br />        _print(obj0.findChild( QObject))<br />        print(obj0.findChild(QObject,**"2"**))
    _#默认通过递归返回所有子对象<br />        _print(obj0.findChildren(QObject))
    _#Qt的内存管理机制<br />        _obj1 = QObject()<br />        self.obj1 = obj1<br />        obj2 = QObject()<br />        obj2.setParent(obj1)
    _#监听obj2对象被释放<br />        _obj2.destroyed.connect(**lambda **:print(**'obj2被释放了'**))
    **del **self.obj1

if name == ‘main‘:
import sys
# 创建应用程序对象
_app = QApplication(sys.argv)
# 创建控件
window = Window()
# 展示并执行
_window.show()

win1 = QWidget()<br />    win1.setStyleSheet(**"background:red;"**)<br />    win1.show()
win2 = QWidget(win1)<br />    win2.setParent(win1)<br />    win2.setStyleSheet(**"background:blue;"**)<br />    win2.resize(200,200)<br />    win2.show()
sys.exit(app.exec_())