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copied!<p>Here is a example demonstrating signals/slots connections between two widgets in PyQt4:</p> <pre><code>#!/usr/bin/env python #-*- coding:utf-8 -*- from PyQt4 import QtCore, QtGui class widgetB(QtGui.QWidget): procDone = QtCore.pyqtSignal(str) def __init__(self, parent=None): super(widgetB, self).__init__(parent) self.lineEdit = QtGui.QLineEdit(self) self.button = QtGui.QPushButton("Send Message to A", self) self.layout = QtGui.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(QtGui.QWidget): procStart = QtCore.pyqtSignal(str) def __init__(self, parent=None): super(widgetA, self).__init__(parent) self.lineEdit = QtGui.QLineEdit(self) self.lineEdit.setText("Hello!") self.button = QtGui.QPushButton("Send Message to B", self) self.button.clicked.connect(self.on_button_clicked) self.layout = QtGui.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(QtGui.QMainWindow): def __init__(self, parent=None): super(mainwindow, self).__init__(parent) self.button = QtGui.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 = QtGui.QApplication(sys.argv) main = mainwindow() main.show() sys.exit(app.exec_()) </code></pre>

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