Wl_subsurface to GdkWaylandSurface

Platform Core
1

Hi,

Is there any way to create a GdkWaylandSurface from an already existing wl_subsurface?

Basically, I create wl_surface using zwlr_layer_surface_v1 and then I create wl_subsurface on top of previously created wl_surface. My requirement is to use this wl_subsurface which I already created as a base for a GtkWindow

I see there there is get_wl_surface() exists from GdkWaylandSurface, But it is not a wl_surface created using zwlr_layer_surface_v1.

Let me know if there is any way.

2

No, there is no way to do that: all the native windowing system surfaces can only be created by GTK itself.

3

There were some WIP patches at some point that were working towards being able to build your own GtkNative from some custom wl_surface, specifically for supporting layer-shell in GTK4. But AFAIK those haven’t landed yet, or necessarily will land. And I don’t know if there’s anyone still working on them (IIRC it was a System76 initiative)

There’s also gtk4-layer-shell, that just intercepts all of GTK’s Wayland communications and kinda forcibly manipulates them to use layer-shell instead. But this is a potentially fragile and not-officially-supported solution. GTK still thinks it has a normal window, so things can break in new and creative ways. But this doesn’t directly solve your issue, it just lets you use GTK with layer-shell, it doesn’t let you plug in arbitrary surfaces that you obtained on your own (at least it didn’t allow this when I last used it a couple of years ago)

4

There’s also gtk4-layer-shell

Yes, I learnt about gtk4-layer-shell after asking this question here.

I think it will be great if we have some way to create gtk widget on top of independently created wl_surface/wl_subsurface.

5

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