Gradience/data/ui/no_plugin_window.blp

using Gtk 4.0;
using Adw 1;

template GradienceNoPluginPrefWindow: Adw.Window {
  title: _("Plugin Preferences");
  modal: true;
  default-width: 400;
  default-height: 400;
  resizable: true;
  deletable: true;

  ShortcutController {
    Shortcut {
      trigger: "Escape";
      action: "action(window.close)";
    }
  }

  Adw.Leaflet leaflet {
    can-unfold: false;

    Gtk.Box main_view {
      orientation: vertical;

      Adw.HeaderBar titlebar {
        styles ["flat"]
      }

      Adw.StatusPage {
        name: "empty";
        icon-name: "action-unavailable-symbolic";
        title: _("No Preferences");
        description: _("This plugin doesn't have any preferences.");
      }
    }
  }
}