Layouting Issue

[glsp-bot]

So far I've got a serverside autolayouting action running on the glsp-server, when the client opens a file with a missing enotation file (see discussion here: https://spectrum.chat/emfcloud/general/freshly-opened-diagramm-is-deflated~e7a15d77-cb9b-4836-a7c1-35c040775fc8?m=MTU3MzcyODczNTAyNw==)

Currently I am having an issue, that the ELK formatter does not have the current positions of the diagram's nodes and edges, thus the rendering is only done in the way of using the default distance. Do you know whether it is at all possible to layout a diagram solemnly in the server and if so do you have an Idea how to get the correct positions?
Or is it required to fire the layout event from the client to the server?

original thread by Jonas Ebel

[planger]

I think @tortmayr can best answer this, but here is my shot at it. :)
As you say, only the client can compute the bounds as it knows how to render the elements in SVG and how the client-side 'micro-layouting' affects the widths and heights of elements.
I think you'll have to send a RequestBoundsAction down to the client first and then the bounds will be computed by the client and sent back to the server with a ComputedBoundsAction.

[planger]

Once the server receives the ComputedBoundsAction, it'll put the computed values into the GModel in the graphical model state:
https://github.com/eclipsesource/graphical-lsp/blob/master/server/glsp-server/src/main/java/com/eclipsesource/glsp/server/actionhandler/ComputedBoundsActionHandler.java
Then you should be able to run a layout based on ELK, see also
https://github.com/eclipsesource/graphical-lsp/blob/master/server/glsp-server/src/main/java/com/eclipsesource/glsp/server/actionhandler/LayoutActionHandler.java