尝试从 ComboBox 的字典中获取一个值并在 textEdit 中插入键 [英] Trying to take a value from a dictionary of a ComboBox and instert the key in a textEdit

问题描述

我有一个字典和一个显示字典值的 ComboBox，我需要在 textEdit 中打印用户选择的字典值的键.这是我的代码.

I have a dictionary and a ComboBox that shows dictionary's values, i need to print in a textEdit the key of the dictionary's value chosen by the user. Here's my code.

import sys
from PyQt5.QtCore import pyqtSlot
from PyQt5.QtWidgets import QApplication, QDialog, QMainWindow
from PyQt5.uic import loadUi
from math import pi

class MainPage(QMainWindow):

    classi = {None : None, "C25/30" : float(14.17), 
        "C28/35" : float(15.87), "C32/40" : float(18.13), 
        "C35/45" : float(19.83), "C40/50" : float(22.6),
        "C45/55" : float(25.5), "C50/60" : float(28.3)}

    Acciaio = {None : None, "B450C" : float(391.3)}

    Ferri = {14 : float(1.54), 16 : float(2.01),
         18 : float(2.54), 20 : float(3.14), 22 : float(3.8)}

    N = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

    def __init__(self):
        super(MainPage, self).__init__()
        loadUi('Concrete.ui', self)
        x = self.fillCombobox()
        y = self.fillCombobox_2()
        z = self.fillCombobox_3()
        v = self.fillCombobox_4()
        w = self.fillCombobox_5()
        a = self.fillCombobox_6()
        b = self.fillCombobox_7()
        c = self.fillCombobox_8()


    def fillCombobox(self):
        for i in self.classi:
            self.comboBox.addItem(i)


    def fillCombobox_2(self):
        for i in self.Acciaio:
            self.comboBox_2.addItem(i)

    def retrieveText(self):
        x = self.comboBox.currentData()
        self.textEdit.setText(x)


app = QApplication(sys.argv)
widget = MainPage()
widget.show()
sys.exit(app.exec_())

我知道函数retrieveText 没有达到我想要的效果，但这是一次尝试，而且它也没有给出任何输出.

I know that the function retrieveText doesn't make what i want but it was a try and also this doesn't give any output.

推荐答案

必须通过 itemData 保存与键关联的值，并在选择项时获取.

You have to save the values associated with the keys through itemData and obtain it when an item is selected.

class MainPage(QMainWindow):

    classi = {
        None: None,
        "C25/30": 14.17,
        "C28/35": 15.87,
        "C32/40": 18.13,
        "C35/45": 19.83,
        "C40/50": 22.6,
        "C45/55": 25.5,
        "C50/60": 28.3,
    }

    def __init__(self):
        super(MainPage, self).__init__()
        loadUi("Concrete.ui", self)
        self.comboBox.currentIndexChanged[int].connect(self.retrieveText)
        self.fillCombobox()

    def fillCombobox(self):
        for key, value in self.classi.items():
            self.comboBox.addItem(key, value)

    @pyqtSlot(int)
    def retrieveText(self, index):
        x = self.comboBox.itemData(index)
        if x is not None:
            self.textEdit.setText(str(x))

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