Widgets

Builders produce a concrete Widget tree. Pass builders to Frame::child / Flow::child via impl Into<Widget> (From impls on each builder).

Widget	Factorio element	Page
Frame	frame	Titled container, layout, caption
Flow	flow	Layout container
ScrollPane	scroll-pane	Scrollable container
Text	label	Caption label
Button	button	Caption + on_click
SpriteButton	sprite-button	Sprite + on_click
Checkbox	checkbox	Caption + on_checked
TextField	textfield	Text input
Slider	slider	Numeric slider
ProgressBar	progressbar	Progress display
DropDown	drop-down	Item list
Sprite	sprite	Static sprite
Line	line	Horizontal / vertical rule
EmptyWidget	empty-widget	Spacer / placeholder

use factorio_rs_gui::shared::button::Button;
use factorio_rs_gui::shared::flow::Flow;
use factorio_rs_gui::shared::frame::Frame;
use factorio_rs_gui::shared::text::Text;
use factorio_rs_gui::shared::widget::Widget;

fn app() -> impl Into<Widget> {
    Frame::new()
        .caption("Hello")
        .direction(GuiDirection::Vertical)
        .child(
            Flow::new()
                .direction(GuiDirection::Vertical)
                .child(Text::new("Label"))
                .child(Button::new("OK")),
        )
}

Prefer factorio_rs_gui::shared::... paths (not a flattened prelude import alone) so Factorio requires resolve correctly after transpile.

Interactive widgets register handlers through mount / install — no manual OnGuiClick (or other GUI event) stubs.