Qcombobox在PyQt中,如何设置一个组合框中的选项,而这取决于另一个组合框的选择?

2024-03-28 09:19:44 发布

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例如,带有选项A和选项B的第一个组合框。 如果我在第一个组合框中选择选项A,则第二个组合框包含选项1、2、3、4、5。 如果我在第一个组合框中选择选项b,第二个组合框包含选项a、b、c、d、e。在

我怎么能在PyQt5中做到这一点?我搜索过Qcombobox类,有2个类activatedcurrentIndexChanged,但不知道我需要使用哪一个以及如何在PyQt5中使用它。在


Tags: 选项pyqt5个类activatedqcomboboxcurrentindexchanged
2条回答

我会这样做:

import sys
from PyQt5 import QtWidgets


class ComboWidget(QtWidgets.QWidget):

    def __init__(self, parent=None):
        super(ComboWidget, self).__init__(parent)
        self.setGeometry(50, 50, 200, 200)

        layout = QtWidgets.QVBoxLayout(self)

        self.comboA = QtWidgets.QComboBox()
        # The second addItem parameter is itemData, which we will retrieve later
        self.comboA.addItem('A', ['1', '2', '3', '4'])
        self.comboA.addItem('B', ['a', 'b', 'c', 'd', 'e'])
        self.comboA.currentIndexChanged.connect(self.indexChanged)
        layout.addWidget(self.comboA)

        self.comboB = QtWidgets.QComboBox()
        # We could have added the 1,2,3,4 items directly, but the following
        # is a bit more generic in case the combobox starts with a different
        # index for some reason:
        self.indexChanged(self.comboA.currentIndex())
        layout.addWidget(self.comboB)

        self.show()

    def indexChanged(self, index):
        self.comboB.clear()
        data = self.comboA.itemData(index)
        if data is not None:
            self.comboB.addItems(data)


def main():
    app = QtWidgets.QApplication(sys.argv)
    w = ComboWidget()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

这样,您的代码就更加经得起未来的考验了,因为它允许您在任何下拉列表中添加/修改/删除项,如果您想在某个时候这样做的话。在

我通过使用3个组合框(让它们称为x、y和z)来实现

  1. x包含A、B,用于选择在另一个组合框中显示的选项。选择A显示组合框y,选择B显示组合框z

  2. y包含1、2、3、4

  3. Z包含a、b、c、d

我用QStackedLayout代替第二个组合框,用两个组合框(y和z)加载它,并根据组合框x中选择的选项一次显示其中一个

方法comboOptionChanged处理此问题。 每当选择combobox x中的其他选项时,都会调用此方法。在

import sys
from PyQt5.QtWidgets import QWidget, QComboBox, QApplication, QFormLayout, QLabel,QStackedLayout

class DynamicComboExample(QWidget):
    def __init__(self):
        super().__init__()
        self.setupUI()

    def setupUI(self):
        self.setGeometry(300,300, 500, 300)
        self.show()

        combo_a = QComboBox(self)
        combo_a.addItem('A')
        combo_a.addItem('B')

        # set slot for when option of combobox A is changed
        combo_a.currentIndexChanged[int].connect(self.comboOptionChanged)

        self.combo_b = QComboBox()
        self.combo_b.addItem('1')
        self.combo_b.addItem('2')
        self.combo_b.addItem('3')
        self.combo_b.addItem('4')

        self.combo_c = QComboBox()
        self.combo_c.addItem('a')
        self.combo_c.addItem('b')
        self.combo_c.addItem('c')
        self.combo_c.addItem('d')
        self.combo_c.addItem('e')

        # use a stacked layout to view only one of two combo box at a time
        self.combo_container_layout = QStackedLayout()

        self.combo_container_layout.addWidget(self.combo_b)
        self.combo_container_layout.addWidget(self.combo_c)

        combo_container = QWidget()
        combo_container.setLayout(self.combo_container_layout)

        form_layout = QFormLayout()

        form_layout.addRow(QLabel('A:\t'), combo_a)

        # the stacked layout is placed in place of the (meant to be) second combobox
        form_layout.addRow(QLabel('B:\t'), combo_container)


        self.setLayout(form_layout)


    def comboOptionChanged(self, idx):
        ''' gets called when option for combobox A is changed'''

        # check which combobox_a option is selected ad show the appropriate combobox in stacked layout
        self.combo_container_layout.setCurrentIndex(0 if idx == 0 else 1)


def main():
    app= QApplication(sys.argv)
    w = DynamicComboExample()
    exit(app.exec_())

if __name__ == '__main__':
    main()

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