OffScreenWindow is miss in gtk4, which one I could use to replace in gtk4

[Sherlock-Holo]

https://gtk-rs.org/gtk3-rs/stable/latest/docs/gtk/struct.OffscreenWindow.html

I draw a widget to OffscreenWindow, then call .draw() to draw the widget to a foreign cairo context

but I found OffScreenWindow is miss in gtk4, so how to draw a widget to a foreign cairo context in gtk4?

[bilelmoussaoui]

I suppose you could use a GtkWidgetPaintable, create a custom gtk::Snapshot, snapshot the paintable there (the following code can be used for inspiration https://gitlab.gnome.org/World/design/app-icon-preview/-/blob/master/src/widgets/project_previewer.rs?ref_type=heads#L117) and I guess you could take the gdk::Texture and draw it content on a cairo context. There might better/other ways, but I would recommend asking gtk developers about it.