Python 从pyside/pyqt中的子小部件调用父方法
我试图从子类中调用父类的方法。具体来说,我的父类是一个Python 从pyside/pyqt中的子小部件调用父方法,python,inheritance,pyqt,pyside,Python,Inheritance,Pyqt,Pyside,我试图从子类中调用父类的方法。具体来说,我的父类是一个PySide.QtGui.QMainWindow对象,我的子类是一个PySide.QtGui.QWidget对象;后者被设置为前者的中心小部件。我正在尝试将子类中的按钮连接到父类中的方法。这在过去使用self.parent().method_name对我有效,但在下面的示例中不起作用,我不明白为什么: import sys from PySide import QtGui, QtCore class MainWindow(QtGui.QM
PySide.QtGui.QMainWindow
对象,我的子类是一个PySide.QtGui.QWidget
对象;后者被设置为前者的中心小部件。我正在尝试将子类中的按钮连接到父类中的方法。这在过去使用self.parent().method_name
对我有效,但在下面的示例中不起作用,我不明白为什么:
import sys
from PySide import QtGui, QtCore
class MainWindow(QtGui.QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
self.do_something() #sanity check
self.cw = ChildWidget()
self.setCentralWidget(self.cw)
self.show()
def do_something(self):
print 'doing something!'
class ChildWidget(QtGui.QWidget):
def __init__(self):
super(ChildWidget, self).__init__()
self.button1 = QtGui.QPushButton()
self.button1.clicked.connect(self.do_something_else)
self.button2 = QtGui.QPushButton()
self.button2.clicked.connect(self.parent().do_something)
self.layout = QtGui.QVBoxLayout()
self.layout.addWidget(self.button1)
self.layout.addWidget(self.button2)
self.setLayout(self.layout)
self.show()
def do_something_else(self):
print 'doing something else!'
def main():
app = QtGui.QApplication(sys.argv)
ex = MainWindow()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
以下是错误:
self.button2.clicked.connect(self.parent().do_something)
AttributeError: 'NoneType' object has no attribute 'do_something'
以下是工作代码:
import sys
from PySide import QtGui, QtCore
class MainWindow(QtGui.QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
self.do_something() #sanity check
self.cw = ChildWidget(self)
self.setCentralWidget(self.cw)
self.show()
def do_something(self):
print 'doing something!'
class ChildWidget(QtGui.QWidget):
def __init__(self, parent=None):
super(ChildWidget, self).__init__(parent=parent)
self.button1 = QtGui.QPushButton()
self.button1.clicked.connect(self.do_something_else)
self.button2 = QtGui.QPushButton()
self.button2.clicked.connect(self.parent().do_something)
self.layout = QtGui.QVBoxLayout()
self.layout.addWidget(self.button1)
self.layout.addWidget(self.button2)
self.setLayout(self.layout)
self.show()
def do_something_else(self):
print 'doing something else!'
def main():
app = QtGui.QApplication(sys.argv)
ex = MainWindow()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
希望,可以帮助您。您从未将
主窗口设置为子窗口的父窗口。
因此self.parent()
的计算结果为None
,因此没有函数do\u something
尝试:
我不理解def\uuu init\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu?它的定义是什么?是否从self.cw=ChildWidget(self)
隐式设置父窗口。ChildWidget
的实例用父self
初始化(即main窗口的实例
)。起初,我对python的基类概念和Qt的父类和子类概念感到困惑。
import sys
from PySide import QtGui, QtCore
class MainWindow(QtGui.QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
self.do_something() #sanity check
self.cw = ChildWidget(self)
self.setCentralWidget(self.cw)
self.show()
def do_something(self):
print 'doing something!'
class ChildWidget(QtGui.QWidget):
def __init__(self, parent):
super(ChildWidget, self).__init__(parent)
self.button1 = QtGui.QPushButton()
self.button1.clicked.connect(self.do_something_else)
self.button2 = QtGui.QPushButton()
self.button2.clicked.connect(self.parent().do_something)
self.layout = QtGui.QVBoxLayout()
self.layout.addWidget(self.button1)
self.layout.addWidget(self.button2)
self.setLayout(self.layout)
self.show()
def do_something_else(self):
print 'doing something else!'
def main():
app = QtGui.QApplication(sys.argv)
ex = MainWindow()
sys.exit(app.exec_())
if __name__ == '__main__':
main()