[HailTheMoons]

I did some researches but I still don't get when or how I call ZO_preHook...

Here is the prototype : function ZO_PreHook(objectTable, existingFunctionName, hookFunction)
I guess objectTable is the name of my Add-on,
existingFunctionName is the function to be called when hookFunction,
and hookFunction is the triggering event.

Could you provide a more complete exemple please ?

Also, are you sure there is an "end" after the "return false" ? When I run this, I have "expected near 'end' " error ; which I have not when I delete the "end".

myAddon = {}
myAddon.name = "myAddon"

function myAddon.Initialize()
    myAddon.weaponSheathed = ArePlayerWeaponsSheathed()
    --preHook the original function
    --function ZO_PreHook(objectTable, existingFunctionName, hookFunction)
    ZO_PreHook(myAddon.name, myAddon.TogglePlayerWield, ArePlayerWeaponsSheathed)
        d("TogglePlayerWield was used")
        return false -- return false to run original function code of TogglePlayerWield afterwards!
    end
end

function myAddon.TogglePlayerWield()
    myAddon.weaponSheathed = not myAddon.weaponSheathed -- toogle
    if myAddon.weaponSheathed then
        d("Weapons are Sheathed.")
    else
        d("Weapons are Drawn.")
    end
end

-- event handler function which will be called when the "addon loaded" event occurs. Initialize our addon after all of its resources are fully loaded.
function myAddon.OnAddOnLoaded(event, addonName)
    -- initialize only when OUR addon is loaded
    if addonName == myAddon.name then
        myAddon:Initialize()
    end
end

-- register our event handler function to be called when the proper event occurs.
EVENT_MANAGER:RegisterForEvent(myAddon.name, EVENT_ADD_ON_LOADED, myAddon.OnAddOnLoaded)