<p>下面是一个示例,演示PyQt4中两个小部件之间的信号/插槽连接:</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>