# Hold down the `next page` button to scroll using the ball { config, lib, ... }: let cfg = config.my.hardware.trackball; in { options.my.hardware.trackball = with lib; { enable = mkEnableOption "trackball configuration"; }; config = lib.mkIf cfg.enable { services.xserver = { # This section must be *after* the one configured by `libinput` # for the `ScrollMethod` configuration to not be overridden inputClassSections = lib.mkAfter [ # MX Ergo '' Identifier "MX Ergo scroll button configuration" MatchProduct "MX Ergo" MatchIsPointer "on" Option "ScrollMethod" "button" Option "ScrollButton" "9" '' ]; }; }; }