How does the QItemDelegate work?

[jpn]

I want my spinbox to have minimum 0.5 and maximum 999. The value should always have three significant digits. How do I solve that if dont subclass the QDoubleSpinBox?

• QDoubleSpinBox::minimum
• QDoubleSpinBox::maximum
• QDoubleSpinBox::decimals
• QDoubleSpinBox::singleStep

And if you really need some custom fancy formatting you reimplement QDoubleSpinBox::textFromValue() and QDoubleSpinBox::valueFromText(). You don't "rewrite" non-virtual setValue().

PS. There are buttons for quotes and code snippets. Could you start using them, please?