自定义 QAbstractItemDelegate 与 QSqlTableModel 的正则表达式
Custom QAbstractItemDelegate with regex for QSqlTableModel
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 table 中的数据，但出于某种原因，我的代码不断抛出错误，是否有一个很好的结构化示例？
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。
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)
如您所见，setText 不进行任何验证。因此，改为使用 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，所以无法使用。最简单的解决方法是完全省略它（PyQt 会在适当的地方自动将参数转换为 QVariant）：
model.setData(index, editor.text())
（注意：如果您使用的是 Python 3，则默认情况下，QVariant 始终会自动与等效的 Python 类型相互转换。
以上解决方案对我不起作用。
# This ensure that validation passes.
text = editor.text()
validator = editor.validator()
if validator is not None:
state, text = validator.validate(text, 0)
if state != QtGui.QValidator.Acceptable:
return
class Delegate(QtSql.QSqlRelationalDelegate):
"""
Delegate class handles the delegate. This allows for custom editing within
the GUI. QtSql.QSqlRelationalDelegate is being subclassed to support custom editing.
Methods that are being overridden are:
createEditor
setEditorData
setModelData
"""
def __init__(self, parent = None):
"""Class constructor."""
super(Delegate, self).__init__(parent)
def createEditor(self, parent, option, index):
"""
This creates the editors in the delegate, which is reimplemented from
QAbstractItemDelegate::createEditor(). It returns the widget used to edit
the item specified by index for editing. The parent widget and style option
are used to control how the editor widget appears.
"""
column = index.column()
if column == 1:
editor = QtGui.QLineEdit(parent)
regex = QtCore.QRegExp(r"[a-zA-Z][a-zA-Z0-9_]{3,60}")
validator = QtGui.QRegExpValidator(regex,parent)
editor.setValidator(validator)
return editor
# Else return the base editor. This will handle all other columns.
else:
return super(AppDelegate, self).createEditor(parent, option, index)
def setEditorData(self, editor, index):
"""
Once the editor has been created and given to the view, the view calls
setEditorData(). This gives the delegate the opportunity to populate the
editor with the current data, ready for the user to edit.
Sets the contents of the given editor to the data for the item
at the given index.
Note that the index contains information about the model being used.
The base implementation does nothing.
If you want custom editing you will need to reimplement this function.
"""
column = index.column()
# Get the data value from the model.
text = index.model().data(index, QtCore.Qt.DisplayRole).toString()
# Set the editors text to be the text from the model.
if column == 1:
editor.setText(text)
# Else return the base setEditorData method.
# This is not strictly needed because in flags the ID column is set
# to be selectable only so it should never call setEditorData.
else:
return super(AppDelegate, self).setEditorData(self, editor, index)
def setModelData(self, editor, model, index):
"""
Sets the data for the item at the given index in the model
to the contents of the given editor. The base implementation does
nothing.
If you want custom editing you will need to reimplement this method.
If the user confirms their edit the editor's data must be written
back to the model. The model will then notify the views that the item
has changed, and those views that are showing the item
will request fresh data to display.
In each case we simply retrieve the value from the appropriate editor,
and call setData (), passing the values as QVariants.
"""
column = index.column()
# Test if the editor has been modified.
if not editor.isModified():
return
# This ensure that validation passes.
text = editor.text()
validator = editor.validator()
if validator is not None:
state, text = validator.validate(text, 0)
if state != QtGui.QValidator.Acceptable:
return
if column == 1:
# Call model.setData and set the data to the text in the QLineEdit.
# After the user confirms the edit then set the model data to the
# new user input.
model.setData(index, QtCore.QVariant(editor.text()))
# else return the base setModelData method.
else:
super(AppDelegate, self).setModelData(self, editor, model, index)
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 table 中的数据，但出于某种原因，我的代码不断抛出错误，是否有一个很好的结构化示例？
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。
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)
如您所见，setText 不进行任何验证。因此，改为使用 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，所以无法使用。最简单的解决方法是完全省略它（PyQt 会在适当的地方自动将参数转换为 QVariant）：
model.setData(index, editor.text())
（注意：如果您使用的是 Python 3，则默认情况下，QVariant 始终会自动与等效的 Python 类型相互转换。
以上解决方案对我不起作用。
# This ensure that validation passes.
text = editor.text()
validator = editor.validator()
if validator is not None:
state, text = validator.validate(text, 0)
if state != QtGui.QValidator.Acceptable:
return
class Delegate(QtSql.QSqlRelationalDelegate):
"""
Delegate class handles the delegate. This allows for custom editing within
the GUI. QtSql.QSqlRelationalDelegate is being subclassed to support custom editing.
Methods that are being overridden are:
createEditor
setEditorData
setModelData
"""
def __init__(self, parent = None):
"""Class constructor."""
super(Delegate, self).__init__(parent)
def createEditor(self, parent, option, index):
"""
This creates the editors in the delegate, which is reimplemented from
QAbstractItemDelegate::createEditor(). It returns the widget used to edit
the item specified by index for editing. The parent widget and style option
are used to control how the editor widget appears.
"""
column = index.column()
if column == 1:
editor = QtGui.QLineEdit(parent)
regex = QtCore.QRegExp(r"[a-zA-Z][a-zA-Z0-9_]{3,60}")
validator = QtGui.QRegExpValidator(regex,parent)
editor.setValidator(validator)
return editor
# Else return the base editor. This will handle all other columns.
else:
return super(AppDelegate, self).createEditor(parent, option, index)
def setEditorData(self, editor, index):
"""
Once the editor has been created and given to the view, the view calls
setEditorData(). This gives the delegate the opportunity to populate the
editor with the current data, ready for the user to edit.
Sets the contents of the given editor to the data for the item
at the given index.
Note that the index contains information about the model being used.
The base implementation does nothing.
If you want custom editing you will need to reimplement this function.
"""
column = index.column()
# Get the data value from the model.
text = index.model().data(index, QtCore.Qt.DisplayRole).toString()
# Set the editors text to be the text from the model.
if column == 1:
editor.setText(text)
# Else return the base setEditorData method.
# This is not strictly needed because in flags the ID column is set
# to be selectable only so it should never call setEditorData.
else:
return super(AppDelegate, self).setEditorData(self, editor, index)
def setModelData(self, editor, model, index):
"""
Sets the data for the item at the given index in the model
to the contents of the given editor. The base implementation does
nothing.
If you want custom editing you will need to reimplement this method.
If the user confirms their edit the editor's data must be written
back to the model. The model will then notify the views that the item
has changed, and those views that are showing the item
will request fresh data to display.
In each case we simply retrieve the value from the appropriate editor,
and call setData (), passing the values as QVariants.
"""
column = index.column()
# Test if the editor has been modified.
if not editor.isModified():
return
# This ensure that validation passes.
text = editor.text()
validator = editor.validator()
if validator is not None:
state, text = validator.validate(text, 0)
if state != QtGui.QValidator.Acceptable:
return
if column == 1:
# Call model.setData and set the data to the text in the QLineEdit.
# After the user confirms the edit then set the model data to the
# new user input.
model.setData(index, QtCore.QVariant(editor.text()))
# else return the base setModelData method.
else:
super(AppDelegate, self).setModelData(self, editor, model, index)