[Question] What incentivizes inheriting from UserControl instead of some other widget?

[angrymidget4728]

Question

The documentation points you to use the UserControls when trying to make custom widgets/controls. UserControl itself inherits from Stack and also comes with a build method that can be used to return something other than a Stack-like.

But if so, why not just inherit from, say, a Container? The code I'm using is this:

class ArrowButton(Container):
    def __init__(self, arrow_icon: Icons):
        super().__init__(
            height=100, 
            width=100, 
            bgcolor=Colors.WHITE, 
            border_radius=500,
            content=Icon(
                name=arrow_icon,
                size=100,
                color=Colors.BLACK,
            )
        )

I can also add methods to change the state, so I don't see why I would specifically need UserControl + its build method. In fact, I have a different project where I managed to build a custom tab system (similar to a web browser) where all custom classes (4 of them) inherit from Container, and it works as intended.

So yeah, what kind of purpose/use case would necessitate the usage of UserControl instead of some other widget? Is there some kind of Flutter-specific nuance I'm missing here?

Code sample

No response

Error message

No response

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• I have searched for answers to my question both in the issues and in previous discussions.

[ndonkoHenri]

You are absolutely right with your observation! :)
This is the main reason why we deprecated the UserControl: https://python.plainenglish.io/whats-new-in-flet-0-21-0-ca482ab4520b

[angrymidget4728]

That's great! Was worried about facing some technical issues down the line if I hadn't used it till now. Thanks!