fix: disabled Radio and CupertinoRadio

[ndonkoHenri]

disabled=True had almost no effect on Radio and CupertinoRadio: the radio could still be selected and kept its enabled colors — only the label grayed out (and for Radio, only when a custom label_style was set).

This regressed in the migration to Flutter's native RadioGroup widget (#5651). The old code disabled a radio by passing onChanged: null to the Flutter widget, but under the RadioGroup API a radio with a RadioGroup ancestor is interactive unless it gets an explicit enabled: false. Flet never passed it, so taps on the radio went straight to the group registry, bypassing the disabled checks that only guarded the label's own tap handler.

Both controls now pass enabled: !disabled to their Flutter widgets:

• a disabled radio ignores taps and renders in its disabled colors;
• fill_color's ControlState.DISABLED value now actually resolves;
• disabling an ancestor (e.g. the whole RadioGroup) cascades down to its radios;
• a disabled Radio's label also grays out with the default text style now, not only with a custom label_style.

Fixes #6159

Test code

import flet as ft

def main(page: ft.Page):
    page.add(
        ft.RadioGroup(
            value="one",
            on_change=lambda e: print("changed:", e.data),
            content=ft.Column(
                controls=[
                    ft.Radio(value="one", label="One", disabled=True),
                    ft.Radio(value="two", label="Two", disabled=True),
                    ft.Radio(value="three", label="Three"),
                ],
            ),
        )
    )

ft.run(main)

Before: "One" and "Two" render fully enabled and clicking them selects them.
After: both render grayed out (radio and label) and clicks are ignored; "Three" still works.

Summary by Sourcery

Bug Fixes:

• Disabled Radio and CupertinoRadio controls now ignore user interaction, cascade disabled state from ancestors, and render using disabled colors including default label styles.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

---

Sourcery is free for open source - if you like our reviews please consider sharing them ✨

• X
• Mastodon
• LinkedIn
• Facebook

_{Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.}

[cloudflare-workers-and-pages]

Deploying flet-website-v2 with    Cloudflare Pages

Latest commit:	b8a09a7
Status:	✅  Deploy successful!
Preview URL:	https://544274e2.flet-website-v2.pages.dev
Branch Preview URL:	https://fix-disabled-radio.flet-website-v2.pages.dev

View logs