如何根据pyqt4中qtable小部件的数量微调框中给出的用户获取小计金额？

Question

根据下表和我作为示例构建的代码，我需要一个适当的代码和表，从中我们可以获取“数量”和“费率”（价格）的值，并将其显示为“小计” '（小计=数量*费率）。在这里理解确切的逻辑有点困惑。

以下是我的代码：

from PyQt4 import QtGui, QtCore

import sys


class Example(QtGui.QWidget):

    def __init__(self):
        super(Example, self).__init__()

        self.initUI()

    def initUI(self):
      self. table = QtGui.QTableWidget(self)
      self.table.move(10,70)
      self.table.resize(500,300)
      self.table_item = QtGui.QTableWidgetItem()
      self.table.setRowCount(3)
      self.table.verticalHeader().hide()
      self.table.setColumnCount(6)
      self.table.setEditTriggers(QtGui.QAbstractItemView.NoEditTriggers)

      self.fnt = self.table.font()
      self.fnt.setPointSize(11)
      self.table.setFont(self.fnt)

      self.table.setHorizontalHeaderLabels(("S.no, Item Description,Qty,Rate(Rs:),Subtotal,"",").split(','))
      self.table.setItem(0,0,QtGui.QTableWidgetItem("1"))
      self.table.setItem(0,1, QtGui.QTableWidgetItem("Acne-aid Wash Facial Cleansing"))
      self.table.setItem(0,3,QtGui.QTableWidgetItem("191.72"))
      self.table.setItem(0,5,QtGui.QTableWidgetItem(""))


      self.table.setItem(1,1,QtGui.QTableWidgetItem("Moisturizer"))
      self.table.setItem(1,3,QtGui.QTableWidgetItem("90"))
      self.table.setItem(1,5,QtGui.QTableWidgetItem(""))
      self.table.setItem(1,0,QtGui.QTableWidgetItem("2"))


      self.table.setItem(2,0,QtGui.QTableWidgetItem("3"))
      self.table.setItem(2,1,QtGui.QTableWidgetItem("Brightening eye cream"))
      self.table.setItem(2,3,QtGui.QTableWidgetItem("40"))
      self.table.setItem(2,5,QtGui.QTableWidgetItem(""))
      for x in range(0,4):
         self.spin = QtGui.QSpinBox()
         self.spin.setMinimum(1)
         self.spin.setMaximum(50)
         self.table.setCellWidget(x,2,self.spin)
      for x in range(0,4):
           self.btn = QtGui.QPushButton(self)
           self.btn.setIcon(QtGui.QIcon("trash1.png"))
           self.table.setCellWidget(x,5,self.btn)

           self.setWindowTitle("To do app")
           self.setGeometry(200,300,600,300)
           self.show()
def main():
    app = QtGui.QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_()) 


if __name__ == '__main__':
    main()

Answer 1

解决方案是将QSpinBox的valueChanged信号连接到已完成计算的任何插槽，该信号发送当前值的信息，但不指示QSpinBox所属的行。为此，我们使用functool.partial指示行（另一个选择是使用lambda函数）。

另一方面，我改进了您的代码，发现您滥用了self，例如在for循环中，不得使用self创建在内部创建的变量。另外，我还减少了用于创建数据的代码。

import sys
from functools import partial
from PyQt4 import QtGui, QtCore


class Example(QtGui.QWidget):
    def __init__(self):
        super(Example, self).__init__()
        self.initUI()

    def initUI(self):
        self. table = QtGui.QTableWidget(3, 6, self)
        self.table.setGeometry(10, 70, 500,300)

        self.table.verticalHeader().hide()
        self.table.setEditTriggers(QtGui.QAbstractItemView.NoEditTriggers)

        fnt = self.table.font()
        fnt.setPointSize(11)
        self.table.setFont(fnt)

        self.table.setHorizontalHeaderLabels(("S.no, Item Description,Qty,Rate(Rs:),Subtotal,"",").split(','))

        all_data = [("1", "Acne-aid Wash Facial Cleansing", 191.72, 0),
                    ("2", "AMoisturizer", 90, 0),
                    ("3", "Brightening eye cream", 40, 0)]

        for r, row_data in enumerate(all_data):
            for c, value in zip((0, 1, 3, 4), row_data):
                it = QtGui.QTableWidgetItem(str(value))
                self.table.setItem(r, c, it)

        for r in range(self.table.rowCount()):

            spin = QtGui.QSpinBox(minimum=0, maximum=50)
            spin.valueChanged.connect(partial(self.calculateSubTotal, r))
            self.table.setCellWidget(r, 2, spin)

            btn = QtGui.QPushButton(icon=QtGui.QIcon("trash1.png"))
            self.table.setCellWidget(r, 5, btn)

        self.setWindowTitle("To do app")
        self.setGeometry(200, 300, 600, 300)
        self.show()


    def calculateSubTotal(self, row, value):
        rate = float(self.table.item(row, 3).text())
        subtotal = value * rate

        item_subtotal = self.table.item(row, 4)
        if item_subtotal is None:
            item_subtotal = QtGui.QTableWidgetItem()
            self.table.setItem(row, 4, item_subtotal)

        item_subtotal.setText(str(subtotal))

def main():
    app = QtGui.QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_()) 


if __name__ == '__main__':
    main()