When a QListWidgetItem is removed, how can I prevent the attached QWidget from being destructed?

[kuqipair]

I want to attach a custom QWidget to a QListWidget, but when I need to clear the QListWidget, I don't want the QWidget to be destructed because I need to reuse the QWidget."

[JonB]

@kuqipair said in When a QListWidgetItem is removed, how can I prevent the attached QWidget from being destructed?:

I want to attach a custom QWidget to a QListWidget

And what call do you make for that? void QListWidget::setItemWidget(QListWidgetItem *item, QWidget *widget)?

Note: The list takes ownership of the widget.

So assuming that if you delete the QListWidgetItem it will take your widget with it. To prevent that you must either remove it from the QListWidgetItem first (presumably setItemWidget(nullptr)?) or you could use QListWidget::takeItem() which hands ownership of the whole QListWidgetItem (with its content) over to you.

[kuqipair]

Actually, what I want to achieve is the ability to switch between multiple different lists within the same QListWidget. Each QListWidgetItem is a custom QWidget, and I don't want to call delete every time I switch to a different view. I found that no matter what I do, the QWidget always gets destructed.

[Pl45m4]

@kuqipair

BTW: Are you aware that adding a QWidget to, say, QListWidget is kinda costly...
It's recommended to use QListWidgetItem or write your own delegate.

[JonB]

@kuqipair
As @Pl45m4 says adding widgets to QListWidget is costly and to be avoided for preference.

the ability to switch between multiple different lists within the same QListWidget

This sounds like a reason not to use a QListWidget, which has its own internal data model. Rather a QListView where you can swatch underlying model at will.