逻辑是相同的,在这里,它们是否是父对象、子对象等并不重要。只需要两个对象都可以同时访问。信号和插槽的设计使得类是独立的。
from PyQt5 import QtCore, QtGui, QtWidgets
class widgetB(QtWidgets.QWidget):
procDone = QtCore.pyqtSignal(str)
def __init__(self, parent=None):
super(widgetB, self).__init__(parent)
self.lineEdit = QtWidgets.QLineEdit(self)
self.button = QtWidgets.QPushButton("Send Message to A", self)
self.layout = QtWidgets.QHBoxLayout(self)
self.layout.addWidget(self.lineEdit)
self.layout.addWidget(self.button)
self.button.clicked.connect(self.on_button_clicked)
@QtCore.pyqtSlot()
def on_button_clicked(self):
self.procDone.emit(self.lineEdit.text())
@QtCore.pyqtSlot(str)
def on_procStart(self, message):
self.lineEdit.setText("From A: " + message)
self.raise_()
@QtCore.pyqtSlot(str)
def on_message_from_main(self, text):
self.lineEdit.setText("From Main: " + text)
class widgetA(QtWidgets.QWidget):
procStart = QtCore.pyqtSignal(str)
def __init__(self, parent=None):
super(widgetA, self).__init__(parent)
self.lineEdit = QtWidgets.QLineEdit(self)
self.lineEdit.setText("Hello!")
self.button = QtWidgets.QPushButton("Send Message to B", self)
self.button.clicked.connect(self.on_button_clicked)
self.layout = QtWidgets.QHBoxLayout(self)
self.layout.addWidget(self.lineEdit)
self.layout.addWidget(self.button)
@QtCore.pyqtSlot()
def on_button_clicked(self):
self.procStart.emit(self.lineEdit.text())
@QtCore.pyqtSlot(str)
def on_widgetB_procDone(self, message):
self.lineEdit.setText("From B: " + message)
self.raise_()
@QtCore.pyqtSlot(str)
def on_message_from_main(self, text):
self.lineEdit.setText("From Main: " + text)
class mainwindow(QtWidgets.QMainWindow):
mainSignal = QtCore.pyqtSignal(str)
def __init__(self, parent=None):
super(mainwindow, self).__init__(parent)
self.button = QtWidgets.QPushButton("Click Me", self)
self.button.clicked.connect(self.on_button_clicked)
self.setCentralWidget(self.button)
self.widgetA = widgetA()
self.widgetB = widgetB()
self.widgetA.procStart.connect(self.widgetB.on_procStart)
self.widgetB.procDone.connect(self.widgetA.on_widgetB_procDone)
self.mainSignal.connect(self.widgetA.on_message_from_main)
self.mainSignal.connect(self.widgetB.on_message_from_main)
@QtCore.pyqtSlot()
def on_button_clicked(self):
self.widgetA.show()
self.widgetB.show()
self.widgetA.raise_()
self.mainSignal.emit("Hello")
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
main = mainwindow()
main.show()
sys.exit(app.exec_())
