On Sun, 2 Jun 2024 18:50:20 GMT, Michael Strauß <mstra...@openjdk.org> wrote:

> This PR completes the CSS Transitions story (see #870) by adding 
> interpolation support for backgrounds and borders, making them targetable by 
> transitions.
> 
> More specifically, the following types will now implement `Interpolatable`.
> 
> - `Insets`
> - `Background`
> - `BackgroundFill`
> - `BackgroundImage`
> - `BackgroundPosition`
> - `BackgroundSize`
> - `Border`
> - `BorderImage`
> - `BorderStroke`
> - `BorderWidths`
> - `CornerRadii`
> - `ImagePattern`
> - `LinearGradient`
> - `RadialGradient`
> - `Stop`
> 
> Note that this PR also changes the specification of `Interpolatable` to make 
> users aware that they shouldn't assume any particular identity of the object 
> returned from the `interpolate()` method. This allows the implementation to 
> re-use objects and reduce the number of object allocations.

First, Thank you for working on these transitions!

> Note that this PR also changes the specification of Interpolatable to make 
> users aware that they shouldn't assume any particular identity of the object 
> returned from the interpolate() method. This allows the implementation to 
> re-use objects and reduce the number of object allocations.

Can you elaborate on this?
Are changes in the Region.background still trigger change events?
If not, is there a mechanism to get them? Like Transform.onTransformChanged?
Are the previous immutable objects like Background and Border now mutable?

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PR Comment: https://git.openjdk.org/jfx/pull/1471#issuecomment-2144762597

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