[Layback_]

Yeap, I got how it works!

But, I still got some questions before I proceed any further.

How do you think of this kind of code structure?

local animal
 
local InitObjects, UpdateObjects
 
function InitObjects()
    local frame = CreateFrame("Frame");
    frame:RegisterUnitEvent("UNIT_POWER_FREQUENT", "player", "vehicle")
 
    function frame:OnEvent(event, ...)
        if event == "UNIT_POWER_FREQUENT" then
            self:UNIT_POWER_FREQUENT(...)
        end
    end
 
    function frame:UNIT_POWER_FREQUENT(...)
        UpdateObjects()
    end
 
    MyModule.frame = frame
end
 
function UpdateObjects()
    -- ...
end
 
function MyModule:OnInitialize()
    local state = MyAddon.db.global[MyModule:GetName()]
 
    self:SetEnabledState(state)
end
 
function MyModule:OnEnable()
    animal = animal or "dog"
 
    if not self.frame then
        InitObjects()
    else
        self.frame:Show()
    end
end
 
function MyModule:OnDisable()
    animal = nil
 
    if self.frame then
        self.frame:Hide()
    end
end

I'm slightly against creating a function within a function, but there doesn't seem to be any other solutions to create a frame, its event functions and :SetScript("OnEvent", ...) when OnIntialize function is called to avoid frames being created in spite of the modules are disabled on Login.

Of course I could create those functions in local, but if possible I would like them to be subordinated to the frame.