在PySide/PyQt中區分許多相同類型的信號源有沒有簡單或優雅的方法?區分PySide中的信號源
我正在學習PySide。我寫了一個簡單的應用程序,它將來自兩個不同的QLineEdit()對象的兩個數字相乘。結果顯示在第三個QLineEdit中。
乘數和被乘數QLineEdit.textChanged()信號連接到一個方法(TxtChanged)。在這種方法中,我必須區分信號源。一些試驗後,我想出了一些解決方法基於佔位符文本(以下4行「有另一種方式?」在我的代碼註釋)
代碼:
import sys
from PySide import QtGui, QtCore
class myGUI(QtGui.QWidget):
def __init__(self, *args, **kwargs):
QtGui.QWidget.__init__(self, *args, **kwargs)
self.multiplier = 0
self.multiplicand = 0
self.myGUIInit()
def myGUIInit(self):
# input forms
a1_label = QtGui.QLabel("a1")
a1_edit = QtGui.QLineEdit()
a1_edit.setPlaceholderText("a1")
a2_label = QtGui.QLabel("a2")
a2_edit = QtGui.QLineEdit()
a2_edit.setPlaceholderText("a2")
# output form
a1a2_label = QtGui.QLabel("a1*a2")
self.a1a2_edit = QtGui.QLineEdit()
self.a1a2_edit.setReadOnly(True)
# forms events
a1_edit.textChanged.connect(self.TxtChanged)
a2_edit.textChanged.connect(self.TxtChanged)
# grid
grid = QtGui.QGridLayout()
grid.setSpacing(10)
grid.addWidget(a1_label,1,0)
grid.addWidget(a1_edit,1,1)
grid.addWidget(a2_label,2,0)
grid.addWidget(a2_edit,2,1)
grid.addWidget(a1a2_label,3,0)
grid.addWidget(self.a1a2_edit,3,1)
self.setLayout(grid)
self.setGeometry(100,100,200,200)
self.setWindowTitle("a*b")
self.show()
def TxtChanged(self,text):
sender = self.sender()
sender_text = sender.text()
if sender_text == '': sender_text = '0'
# is there another way?
if sender.placeholderText() == 'a1':
self.multiplicand = sender_text
else:
self.multiplier = sender_text
product = int(self.multiplier) * int(self.multiplicand)
print(self.multiplier,self.multiplicand,product)
self.a1a2_edit.setText(str(product))
def main():
app = QtGui.QApplication(sys.argv)
mainWindow = myGUI()
sys.exit(app.exec_())
main()
最好的問候, ostrzysz
謝謝大家的答案。最好的祝福! – ostrzysz 2012-02-05 08:54:44