datefield.java

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package com.csa.lib.swing;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Event;
import java.awt.FlowLayout;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowEvent;
import java.awt.event.WindowFocusListener;
import java.net.URL;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Vector;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

import com.toedter.calendar.JCalendar;

public class DateField extends JPanel implements ActionListener {
	private static final long serialVersionUID = 1L;
	public static final String IMG_NAME="datefield.gif";
	SimpleDateFormat sdf;
	Date currentDate;
	JTextField textField;
	JButton openButton;
	JDialog helpWindow;
	JCalendar jCalendar;
	JButton bOk;
	JButton bCancel;
	JButton bClear;
	Vector actionListeners = new Vector();

	/**
	 * Crea un datepicker con un formato por omision
	 */
	public DateField() {
		this("dd/MM/yyyy");
	}

	/**
	 * Crear un datepicker
	 * 
	 * @param sfmt
	 *            formato para la fecha en el texto.
	 */
	public DateField(String sfmt) {
		sdf = new SimpleDateFormat(sfmt);
		setLayout(new FlowLayout(0, 0, 0));
		textField = new JTextField(sfmt.length());
		URL res = DateField.class.getResource(IMG_NAME);
		Image img = Toolkit.getDefaultToolkit().getImage(res);
		MediaTracker m = new MediaTracker(this);
		m.addImage(img, 0);
		try{
		m.waitForAll();
		}catch(Exception e){
			e.printStackTrace();
		}
		ImageIcon icon = new ImageIcon(img);
		openButton = new JButton(icon); //new JButton("...");
		openButton.setPreferredSize(new Dimension(18, 20));
		add(textField);
		add(openButton);
		openButton.addActionListener(this);
		textField.addActionListener(this);
		textField.addMouseListener(new MouseAdapter() {
			public void mouseClicked(MouseEvent e) {
				if (e.getClickCount() >= 2) {
					showHelpWindow();
				}
			}
		});
	}
	
	public Date getDate() {
		return currentDate;
	}

	public void setDate(Date d) {
		currentDate = d;
	}

	public JTextField getTextField() {
		return textField;
	}

	public JButton getOpenButton() {
		return openButton;
	}

	// Soporte a eventos
	public void addActionListener(ActionListener l) {
		actionListeners.add(l);
	}
	public void removeActionListener(ActionListener l) {
		actionListeners.remove(l);
	}

	protected void triggerAction() {
		for (int i = 0; i < actionListeners.size(); i++) {
			ActionListener l = (ActionListener) actionListeners.get(i);
			ActionEvent a = new ActionEvent(this, Event.ACTION_EVENT, "");
			try {
				l.actionPerformed(a);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}


	// Listeners

	public void actionPerformed(ActionEvent e) {
		// System.out.println("DatePicker.actionPerformed()");
		if (e.getSource() == openButton) {
			if (helpWindow == null)
				showHelpWindow();
			return;
		} else if (e.getSource() == bOk) {
			assignDate(jCalendar.getCalendar().getTime());
		} else if (e.getSource() == bClear) {
			assignDate(null);
		} else if (e.getSource() == textField) {
			try {
				String text = textField.getText().trim();
				if (!text.equals(""))
					assignDate(sdf.parse(text));
				else
					assignDate(null);
			} catch (ParseException e1) {
			}
		}
		hideHelpWindow();
	}

	private void assignDate(Date d) {
		currentDate = d;
		if (d != null)
			textField.setText(sdf.format(currentDate));
		else
			textField.setText("");
		triggerAction();
	}
	
	// Soporte a la ventana

	/**
	 * Esconde la ventan de ayuda de seleccion de fecha.
	 */
	void hideHelpWindow() {
		if ((helpWindow != null) && (helpWindow.isShowing())) {
			helpWindow.dispose();
			helpWindow = null;			
		}
	}

	/**
	 * Muestra la ventana de ayuda de seleccion de fecha.
	 */
	void showHelpWindow() {
		Point p = getLocationOnScreen();
		p.y += getHeight();
		helpWindow = new JDialog();
		helpWindow.setUndecorated(true);
		helpWindow.setLocation(p);
		jCalendar = new JCalendar();
		Calendar cal = Calendar.getInstance();
		if (currentDate != null)
			cal.setTime(currentDate);
		jCalendar.setCalendar(cal);
		helpWindow.getContentPane().setLayout(new BorderLayout());
		helpWindow.getContentPane().add(jCalendar, BorderLayout.CENTER);

		JPanel panel = new JPanel(new FlowLayout());
		bOk = new JButton("Ok");
		bCancel = new JButton("Cancel");
		bClear = new JButton("Clear");
		panel.add(bOk);
		panel.add(bCancel);
		panel.add(bClear);
		for (int i = 0; i < panel.getComponentCount(); i++)
			((JButton) panel.getComponent(i)).addActionListener(this);
		helpWindow.getContentPane().add(panel, BorderLayout.SOUTH);
		helpWindow.pack();

		helpWindow.addWindowFocusListener(new WindowFocusListener() {
			public void windowGainedFocus(WindowEvent e) {
				// System.out.println("windowGainedFocus");
			}

			public void windowLostFocus(WindowEvent e) {
				// System.out.println("windowLostFocus");
				hideHelpWindow();
			}
		});
		helpWindow.setVisible(true);
	}

	/**
	 * Ejemplo
	 * @param args
	 */
	public static void main(String[] args) {
		JFrame f = new JFrame();
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		f.getContentPane().setLayout(new FlowLayout());
		f.getContentPane().add(new JLabel("Fecha"));
		f.getContentPane().add(new DateField("dd/MM/yyyy"));
		f.pack();
		f.setVisible(true);
	}
}