import java.util.ArrayList;
import java.util.List;

import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;

public class FilterComboBox extends JComboBox {
	private List<String> array;
	JTextField textfield;

	public FilterComboBox(List<String> array) {
		super(array.toArray());
		this.array = array;
		this.setEditable(true);
		textfield = (JTextField) this.getEditor().getEditorComponent();
//		textfield.addKeyListener(new KeyAdapter() {
//			public void keyReleased(KeyEvent ke) {
//				SwingUtilities.invokeLater(new Runnable() {
//					public void run() {
//						comboFilter(textfield.getText());
//					}
//				});
//			}
//		});
		textfield.getDocument().addDocumentListener(new DocumentListener() {
			@Override
			public void removeUpdate(DocumentEvent e) {
				callFIlter();
			}
			@Override
			public void insertUpdate(DocumentEvent e) {
				callFIlter();
			}
			@Override
			public void changedUpdate(DocumentEvent e) {
			}
		});

	}

	public void callFIlter() {
		try {
			String text = textfield.getDocument().getText(0, textfield.getDocument().getLength());
			comboFilter(text);
		} catch (Exception e2) {
			e2.printStackTrace();
		}
	}

	public synchronized void comboFilter(String enteredText) {
		List<String> autoCompleteArray = new ArrayList<String>();
		for (int i = 0; i < array.size(); i++) {
			if (array.get(i).toLowerCase().contains(enteredText.toLowerCase())) {
				autoCompleteArray.add(array.get(i));
			}
		}
		if (autoCompleteArray.size() > 0) {
			this.setModel(new DefaultComboBoxModel(autoCompleteArray.toArray()));
			this.setSelectedItem(enteredText);
			this.showPopup();
		} else {
			this.hidePopup();
		}
	}

	/* Testing Codes */
	public static List<String> populateArray() {
		List<String> test = new ArrayList<String>();
		test.add("");
		test.add("Mountain Flight");
		test.add("Mount Climbing");
		test.add("Trekking");
		test.add("Rafting");
		test.add("Jungle Safari");
		test.add("Bungie Jumping");
		test.add("Para Gliding");
		return test;
	}
	public static void makeUI() {
		JFrame frame = new JFrame("Adventure in Nepal - Combo Test");

		frame.getContentPane().add(new FilterComboBox(populateArray()));
		frame.pack();
		frame.setLocationByPlatform(true);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}

	public static void main(String[] args) throws Exception {
		 UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
		makeUI();

	}
}