package comboboxapp1;

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Issue3 extends Application {

    public static void main(String[] args) {
        launch(args);
    }
    final ComboBox<String> testedComboBox = new ComboBox<String>();

    @Override
    public void start(Stage stage) throws Exception {
        Pane pane = new Pane();
        pane.setPrefHeight(200);
        pane.setPrefWidth(200);

        pane.getChildren().add(testedComboBox);

        Slider s = new Slider();
        s.setMin(0);
        s.setMax(10);
        s.setShowTickLabels(true);
        s.setShowTickMarks(true);
        s.setMajorTickUnit(1);
        s.valueProperty().addListener(new ChangeListener<Number>(){

            public void changed(ObservableValue<? extends Number> ov, Number t, Number t1) {
                int newValue = t1.intValue();
                System.out.println(newValue);
                testedComboBox.setVisibleRowCount(newValue);
            }
        });

        VBox vb = new VBox();
        vb.getChildren().addAll(pane, getAddItemHBox(), s);
        Scene scene = new Scene(vb, 400, 400);
        stage.setScene(scene);
        stage.show();
    }
    
        private HBox getAddItemHBox() {
        HBox hb = new HBox();
        Label lb = new Label("Add item");
        final TextField tf = TextFieldBuilder.create().prefWidth(50).build();
        Label atLb = new Label("at pos");
        final TextField tfPos = TextFieldBuilder.create().prefWidth(50).build();
        Button bt = ButtonBuilder.create().text("Add!").build();
        bt.setOnAction(new EventHandler() {

            public void handle(Event t) {
                int index = Integer.parseInt(tfPos.getText());
                ((ComboBox) testedComboBox).getItems().add(index, tf.getText());
            }
        });
        hb.getChildren().addAll(lb, tf, atLb, tfPos, bt);
        return hb;
    }
}