我很难理解Python / PyQt的类继承。我有一个MainWindow
和一个弹出窗口QWidget
。在弹出窗口中打开self.label1
后,我想与MainWindow
的QWidget
进行交互,但是我不知道该怎么做。我只知道另一种方法,可以从MainWindow
内的弹出窗口访问所有小部件,反之亦然。
这里是一个示例,在新窗口中打开self.label1
后,MainWindow
的MyPopup
应该得到另一个文本:
import sys
from PyQt4.Qt import *
class MyPopup(QWidget):
def __init__(self):
QWidget.__init__(self)
# I want to change the lable1 of MainWindow
self.cw.label1.setText('hello')
class MainWindow(QMainWindow):
def __init__(self, *args):
QMainWindow.__init__(self, *args)
self.cw = QWidget(self)
self.setCentralWidget(self.cw)
self.btn1 = QPushButton("Click me", self.cw)
self.btn1.setGeometry(QRect(50, 50, 100, 30))
self.label1 = QLabel("No Commands running", self.cw)
self.connect(self.btn1, SIGNAL("clicked()"), self.doit)
self.w = None
def doit(self):
self.w = MyPopup()
self.w.setGeometry(QRect(100, 100, 400, 200))
self.w.show()
if __name__ == "__main__":
app = QApplication(sys.argv)
myapp = MainWindow()
myapp.show()
sys.exit(app.exec_())
您需要将主窗口作为参数传递给MyPopup
的构造函数,请尝试以下操作:
import sys
from PyQt4.Qt import *
class MyPopup(QWidget):
def __init__(self, mainWindow):
QWidget.__init__(self)
# use the mainWindow passed as parameter
mainWindow.label1.setText('hello')
class MainWindow(QMainWindow):
def __init__(self, *args):
QMainWindow.__init__(self, *args)
self.cw = QWidget(self)
self.setCentralWidget(self.cw)
self.btn1 = QPushButton("Click me", self.cw)
self.btn1.setGeometry(QRect(50, 50, 100, 30))
self.label1 = QLabel("No Commands running", self.cw)
self.connect(self.btn1, SIGNAL("clicked()"), self.doit)
self.w = None
def doit(self):
self.w = MyPopup(self) #when creating the popup pass in the main window
self.w.setGeometry(QRect(100, 100, 400, 200))
self.w.show()
if __name__ == "__main__":
app = QApplication(sys.argv)
myapp = MainWindow()
myapp.show()
sys.exit(app.exec_())
这是Alvaro Fuentes的先前回答,对PyQt5进行了较小的更新。
import sys
from PyQt5.Qt import *
class MyPopup(QWidget):
def __init__(self, mainwin):
QWidget.__init__(self)
# I want to change the lable1 of MainWindow
mainwin.label1.setText('hello')
class MainWindow(QMainWindow):
def __init__(self, *args):
QMainWindow.__init__(self, *args)
self.cw = QWidget(self)
self.setCentralWidget(self.cw)
self.btn1 = QPushButton("Click me", self.cw)
self.btn1.setGeometry(QRect(50, 50, 100, 30))
self.label1 = QLabel("No Commands running", self.cw)
self.btn1.clicked.connect(self.doit)
self.w = None
def doit(self):
self.w = MyPopup(self)
self.w.setGeometry(QRect(100, 100, 400, 200))
self.w.show()
if __name__ == "__main__":
app = QApplication(sys.argv)
myapp = MainWindow()
myapp.show()
sys.exit(app.exec_())