Radio buttons in a tree view

[spirit]

Why not implement QItemDelegate::createEditor() .etc to create a radioButton and open it persistent in treeView?

imho, it is bad idea, because performance of your application will decrease, because a lot of descendants of QRadioButton are opend. I think the best way is implement your own model/delegate which will allow to use radio-items approach.

[nifei]

imho, it is bad idea, because performance of your application will decrease, because a lot of descendants of QRadioButton are opend. I think the best way is implement your own model/delegate which will allow to use radio-items approach.

thank you. so, as "Delegate Class" part in Qt's doc says, "Delegates are expected to be able to render their contents themselves by implementing the paint() and sizeHint() functions.", it is not expected to keep a real editor widget persistently? if i need a radio button in some cells all the time, what should i do? should i implement CustomDelegate:aint(), and paint pixmaps of radio_on and radio_off in the cells? I used to do this like this:

CustomDelegate::createEditor()
{
return new QRadioButton;
}

and calling QItemView:penPersistentEditor()for each index, or else the editor will be destroyed the editing finishes. i knew it's not a good way i really need a radiobutton in my view.

[spirit]

1) (quick method) you can use add method setExclusive to a view or to a delegate and then reimplement this method QItemDelegate::drawCheck. according to exclusivity you can draw checkbox (just call drawCheck of paren, i.e. QItemDelegate::drawCheck) or radiobox.
2) subclass a needed model, then subclass a needed item, e.g. QStandartItem, add to it mehtod setExclusive and extend methods setChecked for supporting exclusivity () and then reimplement a method QItemDelegate::drawCheck.
I think that's all. I hope, I helped you.

[nifei]

1) (quick method) you can use add method setExclusive to a view or to a delegate and then reimplement this method QItemDelegate::drawCheck. according to exclusivity you can draw checkbox (just call drawCheck of paren, i.e. QItemDelegate::drawCheck) or radiobox.
2) subclass a needed model, then subclass a needed item, e.g. QStandartItem, add to it mehtod setExclusive and extend methods setChecked for supporting exclusivity () and then reimplement a method QItemDelegate::drawCheck.
I think that's all. I hope, I helped you.

thanks a lot. i'll try.