For the addon, see:

• https://www.curseforge.com/wow/addons/litebag

To support LiteBag you can hook into ItemButton update and create as follows:

1. Update:

   LiteBag_RegisterHook('LiteBagItemButton_Update', YourUpdateFunction)
   

   and optionally LiteBag_AddPluginEvent(eventName) if you need LiteBag to update on additional events. Your function will be called once for every itembutton, with the itembutton as the argument.

2. Create:

   LiteBag_RegisterHook(`LiteBagItemButton_Create', YourFunction)
   

Guild Bank and Reagent Bank are not handed by LiteBag and you will have to hook the standard Blizzard frames for those.

The itembuttons inherit ContainerFrameItemButtonTemplate and anything that works on that will also work on the LiteBag buttons.

E.g.,

if LiteBag_RegisterHook then
    LiteBag_RegisterHook('LiteBagItemButton_Update',
        function (button)
            local slot = button:GetID()
            local bag = button:GetParent():GetID()
            -- your code
        end)
end