PyQt 中的 Qcombobox，如何根据其他组合框的选择在一个组合框中设置选项？

Question

比如第一个组合框有选项A和选项B。如果我在第一个组合框中 select 选项 A，则第二个组合框包含选项 1、2、3、4、5。第二个组合框包含选项 a、b、c、d、e 如果我 select 第一个组合框中的选项 B。

我怎么能在 PyQt5 中做到这一点？我搜索了Qcomboboxclass，有2个classactivated和currentIndexChanged，但不知道我需要使用哪个以及如何在 PyQt5 中使用它。

Answer 1

我通过使用 3 个组合框（我们称它们为 x、y 和 z）来实现它

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
y 包含 1,2,3,4
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，并根据在组合框 x 中选择的选项一次显示其中一个。

方法 comboOptionChanged 处理这个问题。只要在组合框 x 中选择了不同的选项，就会调用此方法。

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()

Answer 2

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()

这样一来，您的代码就更有前瞻性了，因为如果您想在某个时候添加/修改/删除任何下拉菜单中的项目，它可以很容易地添加/修改/删除项目。

PyQt 中的 Qcombobox，如何根据其他组合框的选择在一个组合框中设置选项？

Qcombobox in PyQt, How could I set the options in one combo box which depends on the choice of other combo box?

python

pyqt

qcombobox

pyqt5