HeaderBar (preview) clipped out of window during resize

[Cormac Redmond]

Thanks for the background info, Michael -- also, my knowledge of basic
JavaFX layout is surprisingly abysmal (compared to other areas), I didn't
expect it could be fixed as easily like that (or without affecting
*other* nodes
or something negatively).

I would consider this a ControlsFx bug based on what you've said so it
would be good to get it fixed there as I'm sure many will fall to this in
time.

Anyway -- I've been testing a bunch of HeaderBar/EXTENDED scenarios at this
stage, and all is currently looking good...



Kind Regards,
Cormac

On Tue, 24 Jun 2025 at 19:06, Michael Strauß <michaelstrau2 at gmail.com>
wrote:

> We had a brief discussion back in October 2024 whether HeaderBar
> should be a normal layout container in the scene graph, or whether it
> should live somewhere else (for example something like
> Scene.setHeaderBar(), analogous to Scene.setRoot()). It became clear
> that we wanted HeaderBar to be a part of the scene graph, because its
> capability to interact with the rest of the scene graph is one of the
> main features.
>
> This naturally exposes HeaderBar to the same question that the rest of
> the scene graph has to solve: what to do in case of an overconstrained
> layout? Layout containers have different (but well-specified) answers
> for this question. In your example, you're using a StackPane as the
> root layout container. By default, StackPane will center its content
> if it can't be resized to fit the available space. This behavior can
> be adjusted with the StackPane.alignment property: set to TOP_LEFT,
> the HeaderBar in your example will stay where it is.
>
> The way I see it, there's an easy solution: use the scene graph the
> way it's designed and meant to be used. If ControlsFX wraps the scene
> root in a StackPane, but doesn't set the content alignment to
> TOP_LEFT, then that's a bug in ControlsFX because it changes the way
> the scene graph is laid out.
>
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