PyQt4 信號和槽用法總結

2019-11-08 03:11:54

字體：大中小

來源：轉載

供稿：網友

原文地址

原文 http://neteue.com/article/pyqt4-signal-slot/

信號與槽的例子

可以使用QObject.connect方法來連接信號與槽

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在這個例子中, 使用了標準的連接方式connect(發送者, 信號, 接收者, 槽), Qt中的槽可以這樣理解: 是接收者中經過包裝后某個方法

自定義槽(slot)

當然可以通過QtCore.pyqtSlot自義一個槽, 在舊式風格中使用是的pyqtSignature, 建議使用pyqtSlot

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發送信號

單擊按鈕后觸發emit_python_list信號, 并且執行相應的槽

#! /usr/bin/env python# -*- coding: utf-8 -*-from PyQt4 import QtCore, QtGuiclass MyWidget(QtGui.QWidget): def __init__(self, parent=None): super(MyWidget, self).__init__(parent) self.ok_button = QtGui.QPushButton("OK", self) layout = QtGui.QHBoxLayout() layout.addWidget(self.ok_button) self.setLayout(layout) self.connect(self.ok_button, QtCore.SIGNAL("clicked()"), self, QtCore.SLOT("slot1()")) self.connect(self, QtCore.SIGNAL('emit_python_list(PyQt_PyObject)'), self, QtCore.SLOT("slot2(PyQt_PyObject)")) @QtCore.pyqtSlot() def on_button_clicked(self): print "click me!!!!" @QtCore.pyqtSlot() def slot1(self): self.emit(QtCore.SIGNAL("emit_python_list(PyQt_PyObject)"), [1, 2, 3, 4, 5, 6]) @QtCore.pyqtSlot("PyQt_PyObject") def slot2(self, alist): print alistif __name__ == "__main__": import sys app = QtGui.QApplication(sys.argv) w = MyWidget() w.show() app.exec_()1234567891011121314151617181920212223242526272829303132333435363738

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執行Python方法

這里使用更加優雅直接的方式連接信號并執行回調, 這也是項目中用到最多的方式

#! /usr/bin/env python# -*- coding: utf-8 -*-from PyQt4 import QtCore, QtGuiclass MyWidget(QtGui.QWidget): def __init__(sel`f, parent=None): super(MyWidget, self).__init__(parent) self.ok_button = QtGui.QPushButton("ok", self) layout = QtGui.QHBoxLayout() layout.addWidget(self.ok_button) self.setLayout(layout) self.ok_button.clicked.connect(self.on_ok_button_clicked) def on_ok_button_clicked(self): print "OK"if __name__ == '__main__': import sys app = QtGui.QApplication(sys.argv) win = MyWidget() win.show() sys.exit( app.exec_() )1234567891011121314151617181920212223242526

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self.ok_button.clicked.connect 其中clicked是信號

注冊信號

#! /usr/bin/env python# -*- coding: utf-8 -*-from PyQt4 import QtCore, QtGuiclass MyWidget(QtGui.QWidget): emit_python_list = QtCore.pyqtSignal(object) def __init__(self, parent=None): super(MyWidget, self).__init__(parent) self.ok_button = QtGui.QPushButton("OK", self) layout = QtGui.QHBoxLayout() layout.addWidget(self.ok_button) self.setLayout(layout) self.ok_button.clicked.connect(self.slot1) self.emit_python_list.connect(self.slot2) def slot1(self): self.emit_python_list.emit([1, 2, 3, 4, 5, 6]) def slot2(self, alist): print alistif __name__ == "__main__": import sys app = QtGui.QApplication(sys.argv) w = MyWidget() w.show() app.exec_()1234567891011121314151617181920212223242526272829303132

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自動連接

QMetaObject. connectSlotsByName(QObject)

其作用是如其名稱一樣，用來將QObject 里的子孫QObject的某些信號按照其objectName連接到相應的槽上,

如是使用pyuic生成的代碼, 就是使用這種方式

#! /usr/bin/env python# -*- coding: utf-8 -*-from PyQt4 import QtCore, QtGuiclass MyWidget(QtGui.QWidget): def __init__(self, parent=None): super(MyWidget, self).__init__(parent) self.ok_button = QtGui.QPushButton("OK", self) self.ok_button.setObjectName("ok_button") layout = QtGui.QHBoxLayout() layout.addWidget(self.ok_button) self.setLayout(layout) QtCore.QMetaObject.connectSlotsByName(self) @QtCore.pyqtSlot() # 一定要有,不然會打印兩遍 "OK" def on_ok_button_clicked(self): print "OK"if __name__ == "__main__": import sys app = QtGui.QApplication(sys.argv) w = MyWidget() w.show() app.exec_()1234567891011121314151617181920212223242526272829

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別忘了, 使用setObjectName設置對象名稱

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