[Krainz]

Yup, exactly what I wanted. Thank you very much!

Now slightly off topic, is it possible to also code a short "fade from black" after every loading screen? For immersive purposes.

If needed I'll open another topic for that.

EDIT:

So I coded this:

frame.timer = 0
frame:SetScript("OnUpdate", function(self, elapsed)
        self.timer = self.timer + elapsed
        local x, y = GetCursorPosition()
        if event == "PLAYER_REGEN_ENABLED" then
            if event == "PLAYER_STOPPED_MOVING" then
                if self.x ~= x or self.y ~= y then
                    UIParent:SetAlpha(1)
                    -- UIParent:SetAlpha(UIParent:GetAlpha()+elapsed)
                elseif not IsMouselooking() then
                    self.timer = 0
                    UIParent:SetAlpha(UIParent:GetAlpha()-elapsed)
                end
                if self.timer > 3 then
                    -- check mouse looking here since the cursor position is static while
                    -- holding down right mouse button, also check that you're not mousing
                    -- over a frame since that may not be desirable either
                    if not IsMouselooking() and GetMouseFocus() == WorldFrame then
                        self.x = x
                        self.y = y
                    end
                    
                    self.timer = 0
                end
            else if player started moving
                if event == "PLAYER_STARTED_MOVING" then
                    UIParent:SetAlpha(1)
                end
            end
        end
end)

It's basically:

if player is not in combat and
if player is not moving
hide UI

Added to the '3 seconds without moving the mouse' code.

But it's not working. What did I do wrong?

Alternatively, I'm trying to do this through a variable checking way. It would would set a variable (ihide) to 1 whenever I'd want the UI to hide, and to 0 whenever I wouldn't want it to hide (combat, when the character is moving).

Still, it doesn't work. Why?

local frame = CreateFrame("Frame")
local GetCursorPosition, IsMouselooking = GetCursorPosition, IsMouselooking
local GetMouseFocus = GetMouseFocus
local UIParent, WorldFrame = UIParent, WorldFrame
local ihide = 1
 
 
frame:RegisterEvent("PLAYER_STOPPED_MOVING")
frame:RegisterEvent("PLAYER_STARTED_MOVING")
frame:RegisterEvent("PLAYER_REGEN_DISABLED")
frame.timer = 0
 
 
frame:SetScript("OnEvent", function(self, event)
    if event == "PLAYER_STOPPED_MOVING" then
        if event == "PLAYER_REGEN_ENABLED" then
            ihide = 1
        end
        if event == "PLAYER_REGEN_DISABLED" then
            ihide = 0
        end
    end
    if event == "PLAYER_STARTED_MOVING" then
        ihide = 0
        UIParent:SetAlpha(1)
    end
    if event == "PLAYER_REGEN_DISABLED" then
        ihide = 0
    end
    
end)
 
 
frame:SetScript("OnUpdate", function(self, elapsed)
        self.timer = self.timer + elapsed
        local x, y = GetCursorPosition()
        if self.x ~= x or self.y ~= y then
            UIParent:SetAlpha(1)
            ihide = 0
            -- UIParent:SetAlpha(UIParent:GetAlpha()+elapsed)
        elseif not IsMouselooking() then
            if ihide > 0 then 
                self.timer = 0
                UIParent:SetAlpha(UIParent:GetAlpha()-elapsed)
            end
        end
        if self.timer > 3 then
            -- check mouse looking here since the cursor position is static while
            -- holding down right mouse button, also check that you're not mousing
            -- over a frame since that may not be desirable either
            if not IsMouselooking() and GetMouseFocus() == WorldFrame then
                self.x = x
                self.y = y
            end
            
            self.timer = 0
        end
end)
 
function HelloWorld(self) 
        print("Immersive Hide loaded."); 
end

How can I make this idea work?