如何在javafx文本区域中实现ctrl+f

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Main extends Application {

    private TextArea textArea;
    private TextField searchField;

    @Override
    public void start(Stage primaryStage) {
        textArea = new TextArea();
        searchField = new TextField();
        Button searchButton = new Button("Search");

        searchButton.setOnAction(event -> search());

        VBox root = new VBox(textArea, searchField, searchButton);
        Scene scene = new Scene(root, 400, 300);

        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private void search() {
        String content = textArea.getText();
        String keyword = searchField.getText();

        int index = content.indexOf(keyword);
        if (index != -1) {
            // 找到了匹配的关键字，可以进行相应的处理，如标记颜色等
            // 例如：textArea.selectRange(index, index + keyword.length());
        }
    }

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