基于多个QComboBox的文本启用或禁用QDialogBu ttonBox

Question

基于两个QComboBox的选定文本，我想启用或禁用QDialogBu​​ttonBox，或者最好仅启用或禁用QDialog中的OK按钮。

我的示例如下。当前不起作用，并且在启用或禁用QDialogBu​​ttonBox时，两个ComboBox彼此独立工作。

import sys

from PyQt5.QtCore import QSignalMapper, pyqtSlot
from PyQt5.QtWidgets import (QGroupBox, QFormLayout, QLabel, QComboBox,
                             QApplication, QDialog, QDialogButtonBox,
                             QVBoxLayout)


class SheetColumns(QDialog):
    def __init__(self, column_header):
        super().__init__()

        self.setMinimumWidth(300)
        self.setWindowTitle("Input Column Names")

        self.column_headers = column_header

        self.column_headers.insert(0, ' ')
        self.setWhatsThis('Please match columns in your data sheet names'
                          ' with the right side labels')

        col_names = ["Student Name:", "Student ID:", "Cohort:", "Gender:",
                     "College:", "Department:", "Major:", "Minor", "Email:",
                     "Adviser", "Adviser Email"]
        self.form_group_box = QGroupBox("Specify Column Names")
        self.layout = QFormLayout()
        for col_name in col_names:
            combo = QComboBox()
            combo.addItems(self.column_headers)
            self.layout.addRow(QLabel(col_name), combo)
        self.form_group_box.setLayout(self.layout)

        self.button_box = QDialogButtonBox(
            QDialogButtonBox.Ok | QDialogButtonBox.Cancel)

        self.button_box.setEnabled(False)

        self.layout.itemAt(0, 1).widget().currentTextChanged.connect(
            self.check_validity)
        self.layout.itemAt(1, 1).widget().currentTextChanged.connect(
            self.check_validity)

        self.button_box.accepted.connect(self.accept)
        self.button_box.rejected.connect(self.reject)

        main_layout = QVBoxLayout()
        main_layout.addWidget(self.form_group_box)
        main_layout.addWidget(self.button_box)
        self.setLayout(main_layout)

    def check_validity(self, text):
        print(text)
        if text == ' ':
            self.button_box.setEnabled(False)
        else:
            self.button_box.setEnabled(True)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    dialog = SheetColumns(['name student', 'id', 'cohort', 'test 1'])
    sys.exit(dialog.exec_())

我希望当两个组合框中的currentText不是''时启用QDialogBu​​ttonBox，而当它们都为''时将禁用QDialogBu​​ttonBox。>>

我尝试使用QSignalMapper。

但是，我无法使其正常工作。

class SheetColumns(QDialog):
    def __init__(self, column_header):
        super().__init__()

        self.setMinimumWidth(300)
        self.setWindowTitle("Input Column Names")

        self.column_headers = column_header

        self.column_headers.insert(0, ' ')
        self.setWhatsThis('Please match columns in your data sheet names'
                          ' with the right side labels')

        col_names = ["Student Name:", "Student ID:", "Cohort:", "Gender:",
                     "College:", "Department:", "Major:", "Minor", "Email:",
                     "Adviser", "Adviser Email"]
        self.form_group_box = QGroupBox("Specify Column Names")
        self.layout = QFormLayout()
        for col_name in col_names:
            combo = QComboBox()
            combo.addItems(self.column_headers)
            self.layout.addRow(QLabel(col_name), combo)
        self.form_group_box.setLayout(self.layout)

        self.button_box = QDialogButtonBox(
            QDialogButtonBox.Ok | QDialogButtonBox.Cancel)

        self.button_box.setEnabled(False)

        self.mapper = QSignalMapper(self)

        comb_bx1 = self.layout.itemAt(0, 1).widget()
        comb_bx2 = self.layout.itemAt(1, 1).widget()

        comb_bx1.currentTextChanged.connect(self.mapper.map)
        comb_bx2.currentTextChanged.connect(self.mapper.map)

        self.mapper.setMapping(comb_bx1, comb_bx1.currentText())
        self.mapper.setMapping(comb_bx2, comb_bx2.currentText())

        self.mapper.mapped.connect(self.check_validity)

        self.button_box.accepted.connect(self.accept)
        self.button_box.rejected.connect(self.reject)

        main_layout = QVBoxLayout()
        main_layout.addWidget(self.form_group_box)
        main_layout.addWidget(self.button_box)
        self.setLayout(main_layout)

    def check_validity(self, text):
        print(text)
        if text == ' ':
            self.button_box.setEnabled(False)
        else:
            self.button_box.setEnabled(True)
有人可以告诉我我做错了什么，还是有更好的方法？

提前感谢

我想根据两个QComboBox的选定文本来启用或禁用QDialogBu​​ttonBox，或者最好仅启用或禁用QDialog中的“确定”按钮。我的例子如下。当前不是...

Answer 1

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