UI Control Sample | JavaFX Tutorials and Documentation

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/*
 * Copyright (c) 2011, 2013 Oracle and/or its affiliates.
 * All rights reserved. Use is subject to license terms.
 *
 * This file is available and licensed under the following license:
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in
 * the documentation and/or other materials provided with the distribution.
 * - Neither the name of Oracle nor the names of its
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package comboboxsample;
import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.GridPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import javafx.util.Callback;
 
public class ComboBoxSample extends Application {
 public static void main(String[] args) {
 launch(args);
 }
 
 final Button button = new Button ("Send");
 final Label notification = new Label ();
 final TextField subject = new TextField("");
 final TextArea text = new TextArea ("");
 
 String address = " ";
 
 @Override public void start(Stage stage) {
 stage.setTitle("ComboBoxSample");
 Scene scene = new Scene(new Group(), 450, 250);
 
 final ComboBox emailComboBox = new ComboBox();
 emailComboBox.getItems().addAll(
 "jacob.smith@example.com",
 "isabella.johnson@example.com",
 "ethan.williams@example.com",
 "emma.jones@example.com",
 "michael.brown@example.com" 
 );
 emailComboBox.setPromptText("Email address");
 emailComboBox.setEditable(true); 
 emailComboBox.valueProperty().addListener(new ChangeListener<String>() {
 @Override public void changed(ObservableValue ov, String t, String t1) {
 address = t1; 
 } 
 });
 
 final ComboBox priorityComboBox = new ComboBox();
 priorityComboBox.getItems().addAll(
 "Highest",
 "High",
 "Normal",
 "Low",
 "Lowest" 
 ); 
 priorityComboBox.setValue("Normal");
 priorityComboBox.setCellFactory(
 new Callback<ListView<String>, ListCell<String>>() {
 @Override public ListCell<String> call(ListView<String> param) {
 final ListCell<String> cell = new ListCell<String>() {
 {
 super.setPrefWidth(100);
 } 
 @Override public void updateItem(String item, 
 boolean empty) {
 super.updateItem(item, empty);
 if (item != null) {
 setText(item); 
 if (item.contains("High")) {
 setTextFill(Color.RED);
 }
 else if (item.contains("Low")){
 setTextFill(Color.GREEN);
 }
 else {
 setTextFill(Color.BLACK);
 }
 }
 else {
 setText(null);
 }
 }
 };
 return cell;
 }
 });
 
 
 button.setOnAction(new EventHandler<ActionEvent>() {
 @Override
 public void handle(ActionEvent e) {
 if (emailComboBox.getValue() != null && 
 !emailComboBox.getValue().toString().isEmpty()){
 notification.setText("Your message was successfully sent"
 + " to " + address); 
 emailComboBox.setValue(null);
 if (priorityComboBox.getValue() != null && 
 !priorityComboBox.getValue().toString().isEmpty()){
 priorityComboBox.setValue(null);
 }
 subject.clear();
 text.clear();
 }
 else {
 notification.setText("You have not selected a recipient!"); 
 }
 }
 });
 
 GridPane grid = new GridPane();
 grid.setVgap(4);
 grid.setHgap(10);
 grid.setPadding(new Insets(5, 5, 5, 5));
 grid.add(new Label("To: "), 0, 0);
 grid.add(emailComboBox, 1, 0);
 grid.add(new Label("Priority: "), 2, 0);
 grid.add(priorityComboBox, 3, 0);
 grid.add(new Label("Subject: "), 0, 1);
 grid.add(subject, 1, 1, 3, 1); 
 grid.add(text, 0, 2, 4, 1);
 grid.add(button, 0, 3);
 grid.add (notification, 1, 3, 3, 1);
 
 Group root = (Group)scene.getRoot();
 root.getChildren().add(grid);
 stage.setScene(scene);
 stage.show();
 
 } 
}