Phi*_*hil 4 python qt pyqt signals-slots pyside
我需要让小部件彼此之间进行通信.
我的中央Widget有两个小部件实例:( widget A实例A()),widget B(实例B())当a widget A受一个事件(例如:)的影响时mouseRelease,我需要widget A调用一个函数并做一些计算,处理数据.然后,我需要这个处理的数据将被传递到了widget B,这又在接收到该数据从widget A,将调用函数与此数据,处理它,并做更多的东西吧.
这两个小部件都是源自的自定义小部件QWidget.我几乎可以肯定我需要使用信号和插槽,但我不明白如何实现函数调用部分.
我在这里一遍又一遍地阅读Qt的解释:http: //qt-project.org/wiki/Signals_and_Slots_in_PySide然而我无法弄清楚如何连接两个处理发送和发送数据的小部件.
我真的很感激这里的一些帮助.如果你不能用Python来回答C++,那么请解释一下,然后使用它而不是克制.
小智 8
下面是一个演示PyQt4中两个小部件之间的信号/插槽连接的示例:
#!/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_())
为PyQt5更新@ user1006989的答案：
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):
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_())