Node から JComponent 取得

PanelUtil.fx

import javafx.scene.Node;
import javafx.reflect.FXLocal;

// com.sun.javafx.tk.swing.SwingScene$SwingScenePanel
function getPanel(node: Node) {

    var context = FXLocal.getContext();

    // SGNode
    var nodeClass = context.makeClassRef(node.getClass());
    var impl_getPGNode = nodeClass.getFunction("impl_getPGNode");
    var sgNode = impl_getPGNode.invoke(context.mirrorOf(node)) as FXLocal.ObjectValue;

    // Panel
    var panel = sgNode.getClassType().getFunction("getPanel").invoke(sgNode);
    return (panel as FXLocal.ObjectValue).asObject();
}