Pyqt5--Qobject

#!usr/bin/python
# -*- coding: utf-8 -*-
from PyQt5 import QtCore
from PyQt5.QtCore import QObject, QEvent
from PyQt5.QtWidgets import *
import sys

app = QApplication(sys.argv)


class window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("第一个窗口")
        self.resize(500, 500)
        self.setup_ui()
    def event(self, a0:QEvent) -> bool:

        if a0.type()==QEvent.MouseButtonPress:
            print("=================")
        return super().event(a0)

    def setup_ui(self):
        lable = QLabel(self)
        lable.move(100, 100)
        lable.setText("Hello,world")
        #可以根据不同的objectname来进行属性设置,相当于html中id,
        lable.setObjectName("a")
        # property也用来对属性进行限定设置
        lable.setProperty("level","1")
        lable1 = QLabel(self)
        lable1.move(200, 200)
        lable1.setText("你好，世界")
        lable1.setObjectName("b")
        lable2 = QLabel(self)
        lable2.move(250, 250)
        lable2.setText("你好，界")
        lable2.setObjectName("b")
        lable2.destroyed.connect(lambda :print("lable2被删除了"))
        lable2.deleteLater()
        self.test_Qobject()
        print(lable.parent())

    def test_Qobject(self):
        objectt = QObject()
        # 设置objctname
        objectt.setObjectName("a")
        print(objectt.objectName())
        # 设置property
        objectt.setProperty("name", "1")
        objectt.setProperty("age", "2")
        print(objectt.property("name"))
        object1=QObject()
        # 设置父元素
        object1.setParent(objectt)
        print("===========================")
        # 获取所有子对象
        print(objectt.children())
        # 按条件查找子对象，参数1，子对象类型，参数2子对象名称 ，参数三，是否只查询直接子对象
        objectt.findChild(QObject)
        objectt.findChildren(QObject)
        # 没有父控件的是顶层窗口，有父控件的子控件受父控件限制大小和生命周期
        # 自带的两个信号监听,并且传递参数给接收函数
        object1.destroyed.connect(lambda arg :print("{}对象被销毁释放了".format(arg.objectName)))
        object1.objectNameChanged.connect(lambda arg:print("名字被改变了{}".format(arg)))
        object1.setObjectName("aaa")
        # 临时阻断
        object1.blockSignals(True)
        # 判断信号是否被阻断了
        print(object1.signalsBlocked())
        object1.setObjectName("ccc")
        # 重新建立连接
        object1.blockSignals(False)
        object1.setObjectName("ddd")
        # 一个信号可以有多个槽函数
        object1.destroyed.connect(lambda arg: print("==============++++++++========="))
        # 获取有多少个槽函数
        print(object1.receivers(object1.objectNameChanged))
        # 取消信号连接后，再更改名称就不会触发
        object1.objectNameChanged.disconnect()
        object1.setObjectName("bbbb")
        # 判断是否继承自某个类型
        print(object1.inherits("QObject"))
        # 删除父控件，子控件也会被删除
        del objectt
#         不能直接del object1因为它还有父控件引用它，不能被删除，使用deletelater




win = window()
# 加载qss文件
with open("Qobject.qss")as f:
    app.setStyleSheet(f.read())
#     展示窗口
win.show()
# 进入消息循环
sys.exit(app.exec_())

参考链接：https://www.cnblogs.com/zach0812/category/1524140.html

本文地址：https://blog.csdn.net/lingxiyizhi_ljx/article/details/107445659