A GUI item inventory system for War of Legends era (An addon for The Battle for Wesnoth).

In _main.cfg, at the very beginning of this file, add:

#ifhave ~add-ons/WISh/_main.cfg
    {~add-ons/WISh/utils}
#endif

What does this do?

It loads the WISh resource in the top-level so that the [campaign] tag can recognise it.

Next step is loading the resource:

[campaign]
    # load inventory items
    # load WISH
    [load_resource]
        id=wish_items
    [/load_resource]
[/campaign]

The main macro that places an item on map is:

{WISH_ITEM_PICK_UP ID X Y CANNOT_PICKUP_MESSAGE IMAGE_SHOWN_IN_POPUP OBJECT_WML TYPE=weapon TAKE_IT_STRING="Equip" LEAVE_IT_STRING="Leave"}

Note that this can only be used inside an event.

Example code from Knyghtmare's SotBE rework project

{WISH_ITEM_PICK_UP 
        rock_of_frost_resisting 22 17

        (_"This trinket can be equipped by most units except goblins.")

        ("items/rock.png") (
        [object]
            id=rock_of_frost_resisting
            name= _ "Rock of Frost Resistance"
            take_only_once=no
            image="items/rock.png"
            description= _ "Increase cold resistance by 5%."
            [filter]
                side=1
                [not]
                    race=goblin
                [/not]
            [/filter]

            [effect]
                apply_to=resistance
                replace=no
                [resistance]
                    cold=-5
                [/resistance]
            [/effect]
        [/object]
    ) 
    (TYPE=trinket)}

• OBJECT is an extended version of the [object] from core, namely it supports the following additional keys and tags:
  • locked: boolean, when true, the item cannot be unequipped or sold or remove in anyway except by the unit dying.
  • lock_msg: string, the message shown when trying to remove a locked item.
  • gold_value: Cost of the item, i.e., the gold you get when you sell this item.
  • subtag [filter]: Only units satisfying the condition can pickup this [object].
• TYPE: Optional macro argument specifying the type of the equipment. An unit can only have one item of each type at a time. Please note TYPE can be any 4 values: weapon (default if not specified), armor, trinket, amulet. We have no further plans on expanding the TYPE= value list.
• TAKE_IT_STRING and LEAVE_IT_STRING: Optional macro arguments that specify the caption text to be shown on the Equip and Leave buttons. Default values are (obviously) Equip and Leave.

Accessible via Right click on unit > Inventory if the unit has an item equipped.