如何从动态表格小部件连接组合框？

Question

我正在尝试创建一个表格小部件，其行数根据 SpinBox 变化。

我设法做到了。在表格小部件的每个单元格中，我有一个组合框。

我需要为表格小部件的每一行连接组合框。在接下来的两个组合框中自动选择“国家”时，会出现“首都”选项和对应的“城市”选项。

例如选择国家“美国”时：

• 首都：华盛顿
• 城市：芝加哥，纽约

我把代码写得更清楚。

from PyQt5 import QtCore, QtWidgets

class MainWindow(QtWidgets.QMainWindow):
    def __init__(self):
        super().__init__()
        central = QtWidgets.QWidget()
        self.setCentralWidget(central)
        layout = QtWidgets.QHBoxLayout(central)
        self.spin = QtWidgets.QSpinBox()
        layout.addWidget(self.spin)
        self.table = QtWidgets.QTableWidget(0, 3)
        layout.addWidget(self.table)
        self.table.verticalHeader().setVisible(False)
        for col, label in enumerate(('Country', 'Capital', 'City')):
            header = QtWidgets.QTableWidgetItem(label)
            self.table.setHorizontalHeaderItem(col, header)

        self.spin.setValue(self.table.rowCount())
        self.spin.valueChanged.connect(self.setRowCount)

    def setRowCount(self, count):
        if count == self.table.rowCount():
            return
        # if there are too many rows, remove them
        while self.table.rowCount() > count:
            self.table.removeRow(self.table.rowCount() - 1)
        # if rows are going to be added, create checkable items for them
        while self.table.rowCount() < count:
            row = self.table.rowCount()
            self.table.insertRow(row)

            dic = {"Country": ['Argentina', 'USA', 'Spain'], "Capital": ['Buenos Aires', 'Washington D.C.','Madrid'], "City1": ["Rosario", "Chicago", "Barcelona"],
                   "City2": ["Bariloche", "New York", "Osasuna"]}
            
            for i in range(self.table.columnCount()):
                if i==0:
                    combobox1 = QtWidgets.QComboBox()
                    combobox1.addItems(dic["Country"])
                    self.table.setCellWidget(row, i, combobox1)                    
                elif i==1:
                    combobox2 = QtWidgets.QComboBox()
                    combobox2.addItems(dic["Capital"])
                    self.table.setCellWidget(row, i, combobox2)
                elif i==2:
                    combobox3 = QtWidgets.QComboBox()
                    combobox3.addItems(dic["City1"])
                    combobox3.addItems(dic["City2"])
                    self.table.setCellWidget(row, i, combobox3)

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    test = MainWindow()
    test.show()
    sys.exit(app.exec_())

Answer 1

如果您使用相同的索引保留字典和城市信息，那么使用您当前的代码非常容易。但我不确定这样做是否有效。

无论如何，这是一个使用您当前代码的有效解决方案

from functools import partial
from PyQt5 import QtCore, QtWidgets

class MainWindow(QtWidgets.QMainWindow):
    def __init__(self):
        super().__init__()
        central = QtWidgets.QWidget()
        self.dic = {"Country": ['Argentina', 'USA', 'Spain'], "Capital": ['Buenos Aires', 'Washington D.C.','Madrid'], "City1": ["Rosario", "Chicago", "Barcelona"],
                   "City2": ["Bariloche", "New York", "Osasuna"]}
        self.setCentralWidget(central)
        layout = QtWidgets.QHBoxLayout(central)
        self.spin = QtWidgets.QSpinBox()
        layout.addWidget(self.spin)
        self.table = QtWidgets.QTableWidget(0, 3)
        layout.addWidget(self.table)
        self.table.verticalHeader().setVisible(False)
        for col, label in enumerate(('Country', 'Capital', 'City')):
            header = QtWidgets.QTableWidgetItem(label)
            self.table.setHorizontalHeaderItem(col, header)

        self.spin.setValue(self.table.rowCount())
        self.spin.valueChanged.connect(self.setRowCount)

    def setRowCount(self, count):
        if count == self.table.rowCount():
            return
        # if there are too many rows, remove them
        while self.table.rowCount() > count:
            self.table.removeRow(self.table.rowCount() - 1)
        # if rows are going to be added, create checkable items for them
        while self.table.rowCount() < count:
            row = self.table.rowCount()
            self.table.insertRow(row)
            
            for i in range(self.table.columnCount()):
                if i==0:
                    combobox1 = QtWidgets.QComboBox()
                    combobox1.addItems(self.dic["Country"])
                    combobox1.currentIndexChanged.connect(partial(self.updateCity, row))
                    self.table.setCellWidget(row, i, combobox1)                    
                elif i==1:
                    combobox2 = QtWidgets.QComboBox()
                    combobox2.addItems(self.dic["Capital"])
                    self.table.setCellWidget(row, i, combobox2)
                elif i==2:
                    combobox3 = QtWidgets.QComboBox()
                    combobox3.addItems(self.dic["City1"])
                    self.table.setCellWidget(row, i, combobox3)

    def updateCity(self, index):
        current_index = self.sender().currentIndex()
        capital_widget = self.table.cellWidget(index, 1)
        city_widget = self.table.cellWidget(index, 2)
        capital_widget.setCurrentIndex(current_index)
        city_widget.setCurrentIndex(current_index)

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    test = MainWindow()
    test.show()
    sys.exit(app.exec_())