019-QObject-对象的父子关系-API

墨蓝 2023-07-06 11:43 10阅读 0赞

如何构造以下图片的父子关系？

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMDc4MDMx_size_16_color_FFFFFF_t_70][]

资源：[Python-GUI-PyQ5总概述.xmind][Python-GUI-PyQ5_.xmind]；[QObject.xmind][]

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**一、setParent(parent):设置父对象（并且父对象只能设置一个）**

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**二、children():获取所有直接子对象，parent()是获取父对象**

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**三、findChild(参数1，参数2，参数3)：获取某一个指定名称和类型的子对象**

(1)参数1：类型（QObject）;类型元组（QPushButton,QLabel）

from PyQt5.Qt import *
    class Window(QWidget):
        def __init__(self):
            super().__init__()
            self.setWindowTitle("QObject的学习")  # 窗口标题
            self.resize(500, 500)  # 设置窗口大小
            self.setup_ui()
    
        def setup_ui(self):
            self.QObject对象的父子操作关系()
    
        def QObject对象的父子操作关系(self):
            obj0=QObject()
            obj1=QObject()
            obj2 = QObject()
            obj3 = QObject()
            obj4 = QObject()
            obj5 = QObject()
            label = QLabel()
    
            print("obj0", obj2)
            print("obj1",obj1)
            print("obj2", obj2)
            print("obj3", obj2)
            print("obj4", obj2)
            print("obj5", obj2)
    
            obj1.setParent(obj0)
            obj2.setParent(obj0)
            obj3.setParent(obj1)
            obj4.setParent(obj2)
            obj5.setParent(obj2)
            label.setParent(obj0)
    
            print(obj0.findChild(QLabel))  #子对象和父对象控件不一样，出错
    
    
    if __name__ == '__main__':
        import sys
        app = QApplication(sys.argv)
        window = Window()
        window.show()
        sys.exit(app.exec_())
    
    #返回
    '''
    obj0 <PyQt5.QtCore.QObject object at 0x0000028D4268D310>
    Traceback (most recent call last):
    obj1 <PyQt5.QtCore.QObject object at 0x0000028D4268D280>
      File "C:/Users/Belinda/gui代码/pyqt5/018.py", line 41, in <module>
    obj2 <PyQt5.QtCore.QObject object at 0x0000028D4268D310>
        window = Window()
    obj3 <PyQt5.QtCore.QObject object at 0x0000028D4268D310>
      File "C:/Users/Belinda/gui代码/pyqt5/018.py", line 7, in __init__
    obj4 <PyQt5.QtCore.QObject object at 0x0000028D4268D310>
        self.setup_ui()
    obj5 <PyQt5.QtCore.QObject object at 0x0000028D4268D310>
      File "C:/Users/Belinda/gui代码/pyqt5/018.py", line 10, in setup_ui
        self.QObject对象的父子操作关系()
      File "C:/Users/Belinda/gui代码/pyqt5/018.py", line 33, in QObject对象的父子操作关系
        label.setParent(obj0)
    TypeError: arguments did not match any overloaded call:
      setParent(self, QWidget): argument 1 has unexpected type 'QObject'
      setParent(self, QWidget, Union[Qt.WindowFlags, Qt.WindowType]): argument 1 has unexpected type 'QObject'
    '''

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（2）获取obj1对象地址

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（3）参数2：填写名称，比如获取obj2地址

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（4）参数3：查找选项,Qt.FindDirecChildrenOnly是只查找直接子对象；Qt.FindChildrenRecursively是递归查找，一级一级往下查找

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**四、findChildren(参数1，参数2，参数3)：获取某多个指定名称和类型的子对象，参数1、参数2、参数3与以上相同**

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMDc4MDMx_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200220184713300.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMDc4MDMx,size_16,color_FFFFFF,t_70
[Python-GUI-PyQ5_.xmind]: https://download.csdn.net/download/qq_40078031/12138844
[QObject.xmind]: https://download.csdn.net/download/qq_40078031/12151862