Рассмотрим пример в java на базе Swing создания редактируемый combobox, который включают в себя как текст и так и иконки. Верхушка демонстрирует причудливый пример jcombobox с настраиваемой визуализацией и редактором. Пользовательское средство визуализации и редактор используется для отображения списка объектов jlabel он и включать в себя как текст и иконки.
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import java.awt.*; import java.awt.event.*; import java.util.*; import javax.swing.*; public class EditableComboBox extends JPanel { private BookEntry books[] = { new BookEntry("Ant: The Definitive Guide", "covers/ant.gif"), new BookEntry("Database Programming with JDBC and Java", "covers/jdbc.gif"), new BookEntry("Developing Java Beans", "covers/beans.gif"), new BookEntry("Developing JSP Custom Tag Libraries", "covers/jsptl.gif"), new BookEntry("Java 2D Graphics", "covers/java2d.gif"), new BookEntry("Java and XML", "covers/jxml.gif"), new BookEntry("Java and XSLT", "covers/jxslt.gif"), new BookEntry("Java and SOAP", "covers/jsoap.gif"), new BookEntry("Java and XML Data Binding", "covers/jxmldb.gif"), new BookEntry("Java Cookbook", "covers/jcook.gif"), new BookEntry("Java Cryptography", "covers/jcrypto.gif"), new BookEntry("Java Distributed Computing", "covers/jdist.gif"), new BookEntry("Java I/O", "covers/javaio.gif"), new BookEntry("Java in a Nutshell", "covers/javanut.gif"), new BookEntry("Java Management Extensions", "covers/jmx.gif"), new BookEntry("Java Message Service", "covers/jms.gif"), new BookEntry("Java Network Programming", "covers/jnetp.gif"), new BookEntry("Java Performance Tuning", "covers/jperf.gif"), new BookEntry("Java RMI", "covers/jrmi.gif"), new BookEntry("Java Security", "covers/jsec.gif"), new BookEntry("JavaServer Pages", "covers/jsp.gif"), new BookEntry("Java Servlet Programming", "covers/servlet.gif"), new BookEntry("Java Swing", "covers/swing.gif"), new BookEntry("Java Threads", "covers/jthread.gif"), new BookEntry("Java Web Services", "covers/jws.gif"), new BookEntry("Learning Java", "covers/learnj.gif") }; Map bookMap = new HashMap(); public EditableComboBox() { // Build a mapping from book titles to their entries for (int i = 0 ; i < books.length; i++) { bookMap.put(books[i].getTitle(), books[i]); } setLayout(new BorderLayout()); JComboBox bookCombo = new JComboBox(books); bookCombo.setEditable(true); bookCombo.setEditor( new ComboBoxEditorExample(bookMap, books[0])); bookCombo.setMaximumRowCount(4); bookCombo.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { System.out.println("You chose " + ( (JComboBox)e.getSource()).getSelectedItem() + "!"); } }); bookCombo.setActionCommand("Hello"); add(bookCombo, BorderLayout.CENTER); } public static void main(String s[]) { JFrame frame = new JFrame("Combo Box Example"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setContentPane(new EditableComboBox()); frame.pack(); frame.setVisible(true); } } |