RFR: 8375588: Enhanced property metadata

[John Hendrikx]

On Tue, 20 Jan 2026 21:53:57 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> So, if I understand it correctly, the proposal is to add two-tiered styleable properties? Are there limitations as to which attached property is legal for which node, or any attached property (including custom) can be attached to any node? I understand that CSS part is not there yet, but perhaps this PR should instead go via `HasAttachedProperties` route?

It's not really two-tiered, or I am unsure what you mean by that.  The properties are just coming from the container as a source, but they are still first class properties in all other respects.

There aren't any limitations what a container could have as an attached property; the properties are container type specific, and other container types cannot accidentally get confused by them -- although we could perhaps share a few common property types among FX's containers; margin might be a good example (other frameworks also do this kind of sharing).  So if you moved a node from GridPane to HBox, you wouldn't need to set the margin again, but may have to adjust container specific properties.

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PR Comment: https://git.openjdk.org/jfx/pull/2015#issuecomment-3775186239