@startuml

title Onscreenapp Startup Sequence

entity Systemd
entity HomeScreen_Service
entity Onscreenapp
entity WindowManager as WM

== System StartUp ==

Systemd->Onscreenapp: start

group WindowManger Initilize
Onscreenapp->WM: init(port, token)
Onscreenapp->WM: requestSurface("on_screen.app")
rnote over WM
WM process
end rnote
Onscreenapp<--WM: return SurfaceID
Onscreenapp->WM: subscribe Event_SyncDraw
Onscreenapp->WM: subscribe Event_Visible
Onscreenapp->WM: subscribe Event_Invisible
end

group HomeScreen_Service Initilize
Onscreenapp->HomeScreen_Service: init(port, token)
Onscreenapp->HomeScreen_Service: subscribe showWindow Event
Onscreenapp->HomeScreen_Service: subscribe hideWindow Event
Onscreenapp->Onscreenapp: qmlLoad()
end

@enduml