[英]PYQT: How to send a custom signal from the mainwindow(parent) to a child window?
How do I send a signal from a parent/mainwindow to a child window? 如何从父/主窗口向子窗口发送信号?
For example, how would I register and send mainSignal
down to either widgetA
or widgetB
? 例如,如何注册
mainSignal
并将mainSignal
向下发送到widgetA
或widgetB
?
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_()
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_()
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)
@QtCore.pyqtSlot()
def on_button_clicked(self):
self.widgetA.show()
self.widgetB.show()
self.widgetA.raise_()
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
main = mainwindow()
main.show()
sys.exit(app.exec_())
The logic is the same, here it does not matter if they are parents, children, etc. It is only necessary that both objects can be accessed at the same time. 逻辑是相同的,在这里它们是父母,孩子等都没关系。只需要可以同时访问两个对象即可。 The design of the signals and slots are made so that the classes are independent.
信号和插槽的设计要使类是独立的。
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_())
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