WoWInterface - What is mixin?

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- Legion Beta archived threads (https://www.wowinterface.com/forums/forumdisplay.php?f=177)

- - What is mixin? (https://www.wowinterface.com/forums/showthread.php?t=53415)

galvin

05-08-16 10:36 AM

What is mixin?

I see this in blizzard code. Also see it in the xml, what does it do?

SDPhantom

05-08-16 11:06 AM

It takes a given table and copies the contents into the frame's table. This started showing up in WoD code.

p3lim

05-08-16 11:13 AM

Think of it as inheriting from a template.

SDPhantom

05-08-16 12:08 PM

Kind of, only the "templates" are other Lua tables in which the entries are copied from.

MunkDev

05-08-16 05:04 PM

The name comes from functions being "mixed in" with the widget's table. It's basically just dynamic inheritance from an independent source. If your frame is a meal you're preparing, then mixin functions/tables can be seen as spices. They exist independently from the meal itself, but can be added to your meal, in which case it'll be part of said meal.

SDPhantom

05-08-16 06:36 PM

I think the OP would get it by now. All these analogies are making my head hurt.

Fizzlemizz

05-08-16 06:51 PM

And not one coctail in sight :eek:

galvin

05-09-16 01:51 AM

Thanks for answers :)

myrroddin

05-09-16 10:49 AM

I haven't had time to snoop. Where are Blizzard's mixins?

Fizzlemizz

05-09-16 12:26 PM

See Blizzard_GarrisonMissionUI.xml line 1910 which points to Blizzard_GarrisonMissionUI.lua lines 14 and 16.

SDPhantom

05-09-16 12:38 PM

In WoD, they're mostly used in the Blizzard LoD addons. In XML, this is a tag on a UI object called MixIn as highlighted below.

Code:

<Frame name="GarrisonMissionFrame" inherits="GarrisonMissionFrameTemplate, GarrisonUITemplate" mixin="GarrisonMission,GarrisonFollowerMission">

Note: GarrisonMission in Blizzard_GarrisonMissionTemplates.lua line 5, GarrisonFollowerMission is in Blizzard_GarrisonMissionUI.lua line 14.

In Legion, there's a Lua-implemented function that Blizzard uses as well.

Lua Code:

-- where ... are the mixins to mixin
function Mixin(object, ...)
    for i = 1, select("#", ...) do
        local mixin = select(i, ...);
        for k, v in pairs(mixin) do
            object[k] = v;
        end
    end
 
    return object;
end
 
-- where ... are the mixins to mixin
function CreateFromMixins(...)
    return Mixin({}, ...)
end

Resike

05-09-16 02:24 PM

It's basically a table deep copy, to create skeleton objects for future use.

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