Selection and Plugin Types

Selection and Plugin Types

Group selection types

A group's selection type controls how many plugins the player may choose in it.

Type	Meaning
SelectExactlyOne	The player must select exactly one plugin.
SelectAtMostOne	The player may select one plugin, or none.
SelectAtLeastOne	The player must select at least one plugin.
SelectAny	The player may select any number of plugins (including none).
SelectAll	All plugins are installed; the player cannot deselect them.

Plugin (option) types

A plugin's default type tells the manager how the option should behave/appear. It can also be made dynamic through dependency patterns.

Type	Meaning
Optional	Optional; not selected by default.
Required	Always installed; cannot be deselected.
Recommended	Suggested to the player (selected by default).
NotUsable	Cannot be selected (e.g. a missing requirement).
CouldBeUsable	Usable only under certain conditions (warns the player).

Condition flags and dependencies

Plugins can set flags when selected, and steps/options/conditional installs can be shown or applied depending on flags, installed files, or game/mod dependencies, combined with And/Or operators. This is how you build branching, conditional installers. See FOMOD Format and User Interface (Conditional Installs).