ModularUIWindow

Since 2.2.34

ModularUIWindow hosts a ModularUI in a second operating-system window. The UI still uses the ordinary LDLib2 rendering and input path, but can be moved to another monitor.

The editor's Scene view after being detached into a native window. Its LDLib2 content and controls continue to render normally.

var window = new ModularUIWindow(new ModularUI(UI.of(root)), "My Tool");
window.setDragArea(titleBar);              // optional
window.setStyleSource(parentModularUI);    // optional: follow its theme
if (!window.open(Integer.MIN_VALUE, Integer.MIN_VALUE, 640, 400, false)) {
    // Open the same UI in the Minecraft window instead.
}

API	Description
open(x, y, width, height, decorated)	Creates and shows the native window. Use Integer.MIN_VALUE for platform placement.
close() / isOpen()	Closes or checks the hosted window.
setDragArea(UIElement)	Makes an element act as the title bar drag region.
setStyleSource(ModularUI)	Mirrors runtime stylesheets from an originating UI.
setResizable(boolean)	Enables edge resizing.
setOnCloseRequested(Runnable)	Handles the user close request.

Client-only and optional

This API is client-only. open(...) returns false if a second window cannot be created; callers must provide an in-game fallback. Keep decorated as false unless platform-managed move/resize behavior is explicitly required.