RFR: 8375588: Enhanced property metadata [v2]

[Michael Strauß]

On Wed, 21 Jan 2026 20:31:40 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> > Attached properties are not exclusive to `Node`, we already have an attached property for `Stage` in JFX 26 (`HeaderBar.prefButtonHeight`).
> 
> you could also have `.of(Stage)`.

Yes, and that brings in `Stage` into the API of `AttachedProperty`, where it doesn't belong.

But I think I'm not even clear on what you are proposing here. This PR does two things:
1. It adds the `ReadOnlyProperty.getDeclaringClass()` method.
2. It adds the `AttachedProperty` interface, which property classes can implement.

It seems like you don't object to the first addition, but only to the second addition. But what exactly does your proposed code do, then:

Set<AttachedProperty> props = AttachedProperty.from(node);


What are these `AttachedProperty` objects that I can get from a node? They can't be the actual `Property` instances, as that's what you're objecting to. What can I do with these objects?

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PR Comment: https://git.openjdk.org/jfx/pull/2015#issuecomment-3781088062