Using the Config system

Stacklands includes a config system that you can use to offer various options to players of your mod. Each Mod has its own config file (ConfigFile), which you can access with Mod.Config (you don’t need to create your own!). The config.json file is stored in the mods folder.

Accessing a config entry

Each ConfigFile stores any number of config entries. You can access an entry with the ConfigFile.GetEntry<T>() function. If an entry by that name doesn’t exist yet, it will be automatically created when accessing it. You can also specify a default value for the entry if it doesn’t exist.

You can access or set the value of the entry with the Value and BoxedValue properties, depending on the type you need.

Example for creating config entries
 1// in the mods Awake method, so Config is accessed as this.Config
 2ConfigEntry<string> cstr = Config.GetEntry<string>("example_string", "default value");
 3ConfigEntry<int> cint = Config.GetEntry<int>("example_number", 5);
 4ConfigEntry<bool> cbool = Config.GetEntry<bool>("example_bool", true);
 6Logger.Log($"cstr: {cstr.Value} | cint: {cint.Value} | cbool: {cbool.Value}");
 7//> cstr: default value | cint: 5 | cbool: true
 8cint.Value = 99;
 9Logger.Log($"new cint: {cint.Value}");
10//> new cint: 99

The accessed config entries are added to the mods options menu, which can be accessed in Mod Options > <Mod Name>, where the previous code will produce the following:


And the mods config.json will contain:

2  "example_string": "default value",
3  "example_number": 99,
4  "example_bool": true

Customizing the UI

The Mod Options UI can be configured in 2 ways:

  1. Using ConfigUI (ConfigEntryBase.UI) to customize the name and tooltip

  2. Hiding the automatically created UI and constructing your own

Using ConfigUI

You can use the ConfigEntryBase.UI field to store any arbitrary data about the config entry. Some keys are used by the default Mod Options screen, a list of which can be found below. Mod developers can use the data to create customizable UI for types which are not supported in the base game, such as dropdowns for enums or sliders for selecting number ranges.

The ConfigUI class (accessed as ConfigEntryBase.UI) stores data about what to display in the mod options menu for the config entry.

Example use of ExtraData
1cstr.UI.Name = "cool string";
2cint.UI.NameTerm = "card_apple_name";
3cint.UI.Tooltip = "pro tip: :)";

The previous code will produce the following:


Using OnUI

You can further customize the UI for a config entry with the ConfigUI.OnUI function, which is called when the UI for the config entry is generated upon opening the Mod Options screen.

Example use of ConfigEntry.OnUI
1cstr.UI.OnUI = (ConfigEntry entry) =>
3  Logger.Log("cstr UI is being generated..");

When used alongside enabling the ConfigEntry<T>.UI.Hidden field, you can fully customize the UI. The following example is taken from the UnityExplorer mod, its purpose is to call a function to open a custom options menu.

 1var dummy = Config.GetEntry<bool>("dummy", true);
 2dummy.UI.Name = "this should never appear"; // since it's hidden
 3dummy.UI.Hidden = true;
 4dummy.UI.OnUI = (ConfigEntryBase entry) =>
 6  var btn = UnityEngine.Object.Instantiate(PrefabManager.instance.ButtonPrefab, ModOptionsScreen.instance.ButtonsParent);
 7  btn.transform.localScale =;
 8  btn.transform.localPosition =;
 9  btn.transform.localRotation = Quaternion.identity;
11  btn.TextMeshPro.text = "Open options";
12  btn.TooltipText = "This will open the UnityExplorer options menu.";
13  btn.Clicked += () =>
14  {
15    // UIManager is a UnityExplorer class, not a part of Stacklands
16    UIManager.ShowMenu = true;
17    UIManager.GetPanel(UIManager.Panels.Options).SetActive(true);
18  };