from PyQt5.Qt import *
'''
对象名称、属性相关API:
setObjectName("唯一名称")：给一个Qt对象设置一个名称，一般这是一个ID
objectName():获取对象方法
setProperty("属性名称"，值)：给一个Qt对象动态的添加一个属性与值
property("属性名称"):获取一个对象的属性值
dynamicPropertyNames()：获取一个对象中所有通过setProperty()设置的属性名称
父子对象的操作：
setParent(parent)：设置父对象，父对象只能设置一个
parent()：获取父对象
children():获取所有子对象
findChild(参数1, 可选参数2, 可选参数3)：获取某一个指定名称和类型的子对象
findChildren(参数1, 可选参数2, 可选参数3)：获取某多个指定名称和类型的子对象
信号处理：
widget.信号.connect(槽)：连接信号与槽
obj.disconnect()：取消连接信号与槽
widget.blockSignals(bool):临时（取消）阻止指定控件所有的信号与槽的连接
widget.signalsBlocked():信号是否被阻止
widget.receivers(信号):返回连接到信号的接收器数量
类型判断：
isWidgetType()：判断是否是控件类型
inherits(父类)：一个对象是否继承（直接或者间接）自某个类
对象删除：
obj.deleteLater()：删除一个对象时, 也会解除它与父对象之间的关系
deleteLater()并没有将对象立即销毁，而是向主消息循环发送了一个event，下一次主消息循环收到这个event之后才会销毁对象
这样做的好处是可以在这些延迟删除的时间内完成一些操作，坏处就是内存释放会不及时
事件处理：
childEvent()
customEvent()
eventFilter()
installEventFilter()
removeEventFilter
自由主题
定时器：
startTimer(ms, Qt.TimerType) -> timer_id：开启一个定时器
信号：
objectNameChanged(objectName)：对象名称发生改变时发射此信号
destroyed(obj)：对象被销毁时, 发射此信号
'''
class Window(QWidget):
def __init__(self):
super().__init__()
self.setWindowTitle("QObject的学习")
self.resize(500, 500)
self.setup_ui()
def setup_ui(self):
# self.QObject继承结构测试()
# self.QObject对象名称和属性的操作()
# self.QObject对象的父子关系操作()
# self.QObject信号的操作()
self.QObject类型判定()
# self.QObject对象删除()
def QObject继承结构测试(self):
# QObject.__subclasses__()
mros = QObject.mro()
for mro in mros:
print(mro)
def QObject对象名称和属性的操作(self):
# *************测试API***************开始
# obj = QObject()
# obj.setObjectName("notice")
# print(obj.objectName())
#
# obj.setProperty("notice_level", "error")
# obj.setProperty("notice_level2", "warning")
#
# print(obj.property("notice_level"))
# print(obj.dynamicPropertyNames())
# **************测试API**************结束
# *************案例演示***************开始
with open("QObject.qss", "r") as f:
qApp.setStyleSheet(f.read())
label = QLabel(self)
label.setObjectName("notice")
label.setProperty("notice_level", "warning")
label.setText("社会我顺哥")
label2 = QLabel(self)
label2.move(100, 100)
label2.setObjectName("notice")
label2.setProperty("notice_level", "error")
label2.setText("人狠话不多")
label3 = QLabel(self)
label3.setText("xxxx")
label3.move(150, 150)
btn = QPushButton(self)
btn.setObjectName("notice")
btn.setText("btn")
btn.move(50, 50)
# label.setStyleSheet("font-size: 20px; color: red;")
# *************案例演示***************结束
def QObject对象的父子关系操作(self):
# *************测试API***************开始
# obj0 = QObject()
# obj1 = QObject()
# obj2 = QObject()
# obj3 = QObject()
# obj4 = QObject()
# obj5 = QObject()
# print("obj0", obj0)
# print("obj1", obj1)
# print("obj2", obj2)
# print("obj3", obj3)
# print("obj4", obj4)
# print("obj5", obj5)
#
# obj1.setParent(obj0)
# obj2.setParent(obj0)
# obj2.setObjectName("2")
# # label = QLabel()
# # label.setParent(obj0)
#
#
# obj3.setParent(obj1)
# obj3.setObjectName("3")
#
# obj4.setParent(obj2)
# obj5.setParent(obj2)
#
# # print(obj1.parent())
#
# # print(obj0.children())
#
# # print(obj0.findChild(QObject, "3", Qt.FindDirectChildrenOnly))
# print(obj0.findChildren(QObject))
# *************测试API***************结束
# *************内存管理机制***************开始
obj1 = QObject()
self.obj1 = obj1
obj2 = QObject()
obj2.setParent(obj1)
# 监听obj2对象被释放
obj2.destroyed.connect(lambda : print("obj2对象被释放了"))
del self.obj1
# *************内存管理机制***************结束
def QObject信号的操作(self):
# self.obj = QObject()
# # obj.destroyed
# # obj.objectNameChanged
# # def destroy_cao(obj):
# # print("对象被释放了", obj)
# #
# # self.obj.destroyed.connect(destroy_cao)
# #
# # del self.obj
# def obj_name_cao(name):
# print("对象名称发生了改变", name)
#
# def obj_name_cao2(name):
# print("对象名称发生了改变2", name)
#
# self.obj.objectNameChanged.connect(obj_name_cao)
# self.obj.objectNameChanged.connect(obj_name_cao2)
#
# # print(self.obj.receivers("objectNameChanged")) X
# print(self.obj.receivers(self.obj.objectNameChanged))
# self.obj.setObjectName("xxx")
#
# # self.obj.objectNameChanged.disconnect()
# # print(self.obj.signalsBlocked(), "1")
# # self.obj.blockSignals(True)
# # print(self.obj.signalsBlocked(), "2")
# # self.obj.setObjectName("ooo")
# #
# # self.obj.blockSignals(False)
# # print(self.obj.signalsBlocked(), "3")
# # # self.obj.objectNameChanged.connect(obj_name_cao)
# #
# # self.obj.setObjectName("xxoo")
# *************信号与槽案例***************开始
# btn = QPushButton(self)
# btn.setText("点击我")
# def cao():
# print("点我嘎哈?")
#
# btn.clicked.connect(cao)
# *************信号与槽案例***************结束
pass
def QObject类型判定(self):
# *************API***************开始
# obj = QObject()
# w = QWidget()
# btn = QPushButton()
# label = QLabel()
#
# objs = [obj, w, btn, label]
# for o in objs:
# # print(o.isWidgetType())
# # print(o.inherits("QWidget"))
# print(o.inherits("QPushButton"))
# *************API***************结束
# *************案例***************开始
label1 = QLabel(self)
label1.setText("社会我顺哥")
label1.move(100, 100)
label2 = QLabel(self)
label2.setText("人狠话不多")
label2.move(150, 150)
# del label2
label2.deleteLater()
btn = QPushButton(self)
btn.setText("点我")
btn.move(200, 200)
# for widget in self.findChildren(QLabel):
for widget in self.children():
# print(widget)
# if widget.isWidgetType():
if widget.inherits("QLabel"):
widget.setStyleSheet("background-color: cyan;")
# *************案例***************结束
def QObject对象删除(self):
obj1 = QObject()
self.obj1 = obj1
obj2 = QObject()
obj3 = QObject()
obj3.setParent(obj2)
obj2.setParent(obj1)
obj1.destroyed.connect(lambda : print("obj1被释放了"))
obj2.destroyed.connect(lambda : print("obj2被释放了"))
obj3.destroyed.connect(lambda : print("obj3被释放了"))
# del obj2
obj2.deleteLater()
# print(obj1.children())
print(obj2)
# 才会真正的去释放相关的对象
def QWidget控件的父子关系():
# win1 = QWidget()
# win1.setWindowTitle("红色")
# win1.resize(500, 500)
# win1.setStyleSheet("background-color: red;")
# win1.show()
#
# win2 = QWidget()
# win2.setWindowTitle("绿色")
# win2.setStyleSheet("background-color: green;")
# # win2.setParent(win1)
# win2.resize(1000, 100)
# win2.show()
win_root = QWidget()
label1 = QLabel()
label1.setText("label1")
label1.setParent(win_root)
label2 = QLabel()
label2.move(50, 50)
label2.setText("label2")
label2.setParent(win_root)
label3 = QLabel()
label3.move(80, 80)
label3.setText("label3")
label3.setParent(win_root)
btn = QPushButton(win_root)
btn.move(100, 100)
btn.setText("btn")
win_root.show()
for sub_widget in win_root.findChildren(QLabel):
print(sub_widget)
sub_widget.setStyleSheet("background-color: cyan;")
def 信号与槽():
# 连接窗口标题变化的信号 与 槽
def cao(title):
# print("窗口标题变化了", title)
# window.windowTitleChanged.disconnect()
window.blockSignals(True)
window.setWindowTitle("撩课-" + title)
window.blockSignals(False)
# window.windowTitleChanged.connect(cao)
window.windowTitleChanged.connect(cao)
window.setWindowTitle("Hello Sz")
# window.setWindowTitle("Hello Sz2")
# window.setWindowTitle("Hello Sz3")
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
# QWidget控件的父子关系()
window = Window()
# window = QWidget()
window.show()
sys.exit(app.exec_())PyQt5之QObject API学习
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转载自blog.csdn.net/PZ0605/article/details/101107806
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