JavaFXで2つのListViewのスクロールを同期させるサンプル

Controller.java

package sample;

import java.util.Set;

import javafx.application.Platform;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.geometry.Orientation;
import javafx.scene.Node;
import javafx.scene.control.ListView;
import javafx.scene.control.ScrollBar;

public class Controller {

    @FXML
    ListView<String> leftListView;

    @FXML
    ListView<String> rightListView;

    @FXML
    void addData(ActionEvent event) {
        ObservableList<String> items = FXCollections.observableArrayList();
        for (int i = 0; i < 50; i++) {
            items.add("リストに格納するアイテム " + i + "番目");
        }
        leftListView.getItems().addAll(items);
        rightListView.getItems().addAll(items);
    }

    public void requestBind() {
        Platform.runLater(this::bindScrollBar);
    }

    private void bindScrollBar() {
        ScrollBar leftVerticalScrollBar = getScrollBar(leftListView, true);
        ScrollBar rightVerticalScrollBar = getScrollBar(rightListView, true);
        leftVerticalScrollBar.valueProperty().bindBidirectional(rightVerticalScrollBar.valueProperty());
        ScrollBar leftHorizontalScrollBar = getScrollBar(leftListView, false);
        ScrollBar rightHorizontalScrollBar = getScrollBar(rightListView, false);
        leftHorizontalScrollBar.valueProperty().bindBidirectional(rightHorizontalScrollBar.valueProperty());
    }

    private ScrollBar getScrollBar(ListView<String> listView, boolean vertical) {
        Set<Node> nodes = listView.lookupAll(".scroll-bar");
        for (Node node : nodes) {
            if (node instanceof ScrollBar) {
                ScrollBar scrollBar = (ScrollBar) node;
                if (vertical && scrollBar.getOrientation() == Orientation.VERTICAL) {
                    return scrollBar;
                } else if (!vertical && scrollBar.getOrientation() == Orientation.HORIZONTAL) {
                    return scrollBar;
                }
            }
        }
        throw new IllegalStateException("Not found!");
    }

}

Main.java

package sample;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        FXMLLoader loader = new FXMLLoader(getClass().getResource("sample.fxml"));
        Parent root = loader.load();
        primaryStage.setTitle("Scroll Test");
        primaryStage.setScene(new Scene(root));
        primaryStage.show();
        Controller controller = loader.getController();
        controller.requestBind();
    }


    public static void main(String[] args) {
        launch(args);
    }
}

sample.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.ListView?>
<?import javafx.scene.layout.*?>
<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="273.0" prefWidth="348.0" xmlns="http://javafx.com/javafx/8.0.40" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
   <center>
      <HBox BorderPane.alignment="CENTER">
         <children>
            <ListView fx:id="leftListView" prefHeight="200.0" prefWidth="200.0" />
            <ListView fx:id="rightListView" prefHeight="200.0" prefWidth="200.0" />
         </children>
      </HBox>
   </center>
   <bottom>
      <Button mnemonicParsing="false" onAction="#addData" text="Add Data" BorderPane.alignment="CENTER">
         <BorderPane.margin>
            <Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
         </BorderPane.margin>
      </Button>
   </bottom>
</BorderPane>