带有正则表达式的自定义 QAbstractItemDelegate 用于 QSqlTableModel

问题描述

我正在尝试创建一个自定义委托，以便我可以使用 Regex 来验证输入到表中的数据，但由于某种原因，我的代码不断抛出错误，是否有一个好的结构化示例?

I'm trying to create a custom delegate so I can use Regex to verify the data that's being entered into the table but for some reason, my code keeps throwing errors, is there a good structured example?

这是我目前遇到的两个错误，当我使用 QLineEdit.setText 修复 AttributeError: 'QLineEdit' object has no attribute 'set' 时，我的正则表达式不起作用它允许添加任何值.

These are the two errors I'm currently getting, and when I fix the AttributeError: 'QLineEdit' object has no attribute 'set' by using QLineEdit.setText my regular expression doesn't work and it allows any value to be added in.

Traceback (most recent call last):
  File "F:\Computing\Program V3\stockGui.py", line 23, in setEditorData
    editor.set(text)
AttributeError: 'QLineEdit' object has no attribute 'set'
Traceback (most recent call last):
  File "F:\Computing\Program V3\stockGui.py", line 29, in setModelData
    model.setData(index, QVariant(editor.text()))
NameError: name 'QVariant' is not defined






class ProductDelegate(QtSql.QSqlRelationalDelegate):
    def __init__(self):
        super().__init__()

    def createEditor(self, parent, option, index):
        if index.column() == 1:
            editor = QtGui.QLineEdit(parent)
            regex = QtCore.QRegExp(r"(?:[A-Z|\s]+)")
            validator = QtGui.QRegExpValidator(regex,parent)
            editor.setValidator(validator)
            return editor
        else:
            return QtSql.QSqlRelationalDelegate.createEditor(self, parent, option, index)

    def setEditorData(self, editor, index):
        if index.column() == 1:
            text = index.model().data(index, QtCore.Qt.DisplayRole)
            editor.set(text)
        else:
            QtSql.QSqlRelationalDelegate.setEditorData(self, editor,index)

    def setModelData(self, editor, model, index):
        if index.column() == 1:
            model.setData(index, QVariant(editor.text()))
        else:
            QtSql.QSqlRelationalDelegate.setModelData(self, editor, model, index)

推荐答案

正如您所发现的，setText 不进行任何验证.因此，请改用 insert:

As you've discovered, setText doesn't do any validatation. So, instead, use insert:

    text = index.model().data(index, QtCore.Qt.DisplayRole)
    editor.clear()
    editor.insert(text)

另一个错误是因为你没有导入QVariant，所以你不能使用它.最简单的解决方法是完全省略它(PyQt 会在合适的地方自动将参数转换为 QVariant):

The other error is caused simply because you did not import QVariant, and so you can't use it. The easiest fix is to just omit it altogether (PyQt will automatically convert to arguments to a QVariant wherever it's appropriate):

    model.setData(index, editor.text())

(注意:如果您使用的是 Python 3，那么默认情况下，QVariant 总是自动转换为等效的 Python 类型或从等效的 Python 类型转换).

(NB: if you're using Python 3, then, by default, QVariant is always automatically converted both to and from the equivalent Python types).

这篇关于带有正则表达式的自定义 QAbstractItemDelegate 用于 QSqlTableModel的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！