PyQt5之QObject API学习_pyqt5receivers

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_())