java - Javafx: bind Hbox spacing? -

i have tableview , hbox below table, in hbox there threelabels 1 contains text, , 2 contains sum of 2 columns in table. want set spacing somehow dynamic hbox align 2 labels below 2 columns in table belong. there possibility bind hbox's spacing columns position. accept other solution fixes labels below respective columns. here image shows want:

bind each label's minwidth , prefwidth properties corresponding column's width property:

import javafx.application.application; import javafx.scene.scene; import javafx.scene.control.label; import javafx.scene.control.tablecolumn; import javafx.scene.control.tableview; import javafx.scene.layout.borderpane; import javafx.scene.layout.hbox; import javafx.stage.stage;  public class tablewithlabelsbelowcolumns extends application {      @override     public void start(stage primarystage) {         tableview<void> table = new tableview<>();         table.getitems().add(null);          tablecolumn<void, void> firstnamecolumn = new tablecolumn<>("first name");         tablecolumn<void, void> lastnamecolumn = new tablecolumn<>("last name");         tablecolumn<void, void> emailcolumn = new tablecolumn<>("email");         table.getcolumns().add(firstnamecolumn);         table.getcolumns().add(lastnamecolumn);         table.getcolumns().add(emailcolumn);          label fnlabel = new label("fn");         label lnlabel = new label("ln");         label emaillabel = new label("e");          fnlabel.prefwidthproperty().bind(firstnamecolumn.widthproperty());         fnlabel.minwidthproperty().bind(firstnamecolumn.widthproperty());         lnlabel.prefwidthproperty().bind(lastnamecolumn.widthproperty());         lnlabel.minwidthproperty().bind(lastnamecolumn.widthproperty());         emaillabel.prefwidthproperty().bind(emailcolumn.widthproperty());         emaillabel.minwidthproperty().bind(emailcolumn.widthproperty());          hbox labels = new hbox(fnlabel, lnlabel, emaillabel);          borderpane root = new borderpane(table);         root.setbottom(labels);          scene scene = new scene(root);         primarystage.setscene(scene);         primarystage.show();      }      public static void main(string[] args) {         launch(args);     } } 

an alternative approach subclass pane , override layoutchildren() method position labels according widths of columns. register listener request layout on pane each column's width:

import javafx.application.application; import javafx.beans.value.changelistener; import javafx.scene.scene; import javafx.scene.control.label; import javafx.scene.control.tablecolumn; import javafx.scene.control.tableview; import javafx.scene.layout.borderpane; import javafx.scene.layout.pane; import javafx.stage.stage;  public class tablewithlabelsbelowcolumns extends application {      @override     public void start(stage primarystage) {         tableview<void> table = new tableview<>();         table.getitems().add(null);          tablecolumn<void, void> firstnamecolumn = new tablecolumn<>("first name");         tablecolumn<void, void> lastnamecolumn = new tablecolumn<>("last name");         tablecolumn<void, void> emailcolumn = new tablecolumn<>("email");         table.getcolumns().add(firstnamecolumn);         table.getcolumns().add(lastnamecolumn);         table.getcolumns().add(emailcolumn);          label fnlabel = new label("fn");         label lnlabel = new label("ln");         label emaillabel = new label("e");          pane labelpane = new pane(fnlabel, lnlabel, emaillabel) {             @override             protected void layoutchildren() {                 double fnwidth = firstnamecolumn.getwidth();                 double fnheight = fnlabel.prefheight(fnwidth);                 fnlabel.resizerelocate(0, 0, fnwidth, fnheight);                  double lnwidth = lastnamecolumn.getwidth();                 double lnheight = lnlabel.prefheight(lnwidth);                 lnlabel.resizerelocate(fnwidth, 0, lnwidth, lnheight);                  double emailwidth = emailcolumn.getwidth();                 double emailheight = emaillabel.prefheight(emailwidth);                 emaillabel.resizerelocate(fnwidth+lnwidth, 0, emailwidth, emailheight);             }         };         changelistener<? super number> listener = (obs, oldvalue, newvalue) -> labelpane.requestlayout();         firstnamecolumn.widthproperty().addlistener(listener);         lastnamecolumn.widthproperty().addlistener(listener);         emailcolumn.widthproperty().addlistener(listener);          borderpane root = new borderpane(table);         root.setbottom(labelpane);          scene scene = new scene(root);         primarystage.setscene(scene);         primarystage.show();      }      public static void main(string[] args) {         launch(args);     } }