PyQt QLineEdit 与 QValidator

问题描述

我的项目中有一个 QLineEdit.我想在 lineEdit 上使用 QValidation.

I have a QLineEdit in my project. I want to use the QValidation on lineEdit.

#Create lineEdit
itemValue = QtWidgets.QLineEdit()
#Create валидатор
objValidator = QtGui.QDoubleValidator(self)
#setup range
objValidator.setRange(-10.0, 100.0, 5)
#lineEdit with validation
itemValue.setValidator(objValidator)

但效果不好.我可以输入我想要的，除了符号.而且范围不起作用！我可以输入 100500 或 -100500，但我希望，该用户只能输入范围内的数字.

But it doesn't work well.I can type what i want, except symbols. And range doesn't work!I can type 100500 or -100500, but i want, that user can enter numbers only in range.

我应该如何使用范围?我需要帮助:)

How i should use range? I need help:)

谢谢你们的帮助，伙计们！

Thanks for your help, guys!

推荐答案

默认情况下，验证器不会阻止输入超出范围的值，如果输入的值也不会阻止用户离开行编辑是无效或中间.

By default, a validator will not prevent values outside the range from being entered, and it won't prevent the user leaving the line-edit if the entered value is Invalid or Intermediate.

但是，它确实让您有机会以编程方式拒绝输入，因为只要当前值不可接受，行编辑就不会发出它的 editingFinished 或 returnPressed 信号，及其 hasAcceptableInput 方法将返回 False.另外，如果你子类化验证器，你可以重新实现它的 fixup 方法来控制输入的值.

However, it does give you an opportunity to reject the input programmatically, because whenever the current value is unacceptable, the line-edit won't emit its editingFinished or returnPressed signals, and its hasAcceptableInput method will return False. In addition, if you subclass the validator, you can reimplement its fixup method to control the values that are entered.

然而，正如已经建议的那样，更好/更简单的解决方案是使用 QDoubleSpinBox，因为它会自动清理输入并提供更友好的用户界面.

However, as has been suggested already, a far better/simpler solution is to use a QDoubleSpinBox, since it cleans up the input automatically and provides a more user-friendly interface.

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