import com.sun.javafx.runtime.VersionInfo;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.HBox;
import javafx.scene.text.Font;
import javafx.stage.Stage;
import javafx.util.Callback;

public class ComboBoxCellHeightSample extends Application {
    ComboBox<String> comboBox;
    final static int INITIAL_FONT_SIZE = 8;
    final static int MAX_FONT_SIZE = 36;

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

    @Override
    public void start(Stage stage) throws Exception {
        stage.setTitle(VersionInfo.getRuntimeVersion());
        Scene scene = createScene();
//        System.setProperty("http.proxyHost", "www-proxy.uk.oracle.com");
//        System.setProperty("http.proxyPort", "80");
//        scene.getStylesheets().add(ComboBoxCellHeightSample.class.getResource("font.css").toExternalForm());
        stage.setScene(scene);
        stage.show();
    }

    private Scene createScene() {
        HBox root = new HBox(4);
        comboBox = new ComboBox<String>();
        root.getChildren().add(comboBox);

        Button populateComboBoxWithFontSizes = new Button("Populate ComboBox with font sizes");

        populateComboBoxWithFontSizes.setOnAction(new EventHandler<ActionEvent>() {
            public void handle(ActionEvent t) {

                comboBox.setCellFactory(new Callback<ListView<String>, ListCell<String>>() {
                    @Override
                    public ListCell<String> call(ListView<String> p) {
                        return new ListCell<String>() {
                            {
                                setContentDisplay(ContentDisplay.TEXT_ONLY);
                            }

                            @Override
                            protected void updateItem(String item, boolean empty) {
                                super.updateItem(item, empty);

                                if (item == null || empty) {
                                    setText(null);
                                } else {
                                    setText(item);
                                    setFont(new Font(Double.valueOf(item)));
                                }
                            }
                        };
                    }
                });

                for (int i = INITIAL_FONT_SIZE; i <= MAX_FONT_SIZE; i += 2) {
                    comboBox.getItems().add(String.valueOf(i));
                }
            }
        });

        root.getChildren().add(populateComboBoxWithFontSizes);

        return new Scene(root, 400, 300);
    }
}