fontfield.java

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package com.csa.lib.swing;

import java.awt.Dimension;
import java.awt.Event;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.Image;
import java.awt.MediaTracker;
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.net.URL;
import java.text.MessageFormat;
import java.util.Vector;

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

public class FontField extends JPanel {
	private static final long serialVersionUID = 1L;
	public static final String IMG_NAME="fontfield.gif";

	Font currentFont;

	JLabel label;

	JButton openButton;

	/**
	 * Lista de componentes que reciben notificaciones desde este objeto
	 */
	Vector actionListeners = new Vector();

	public String getFontDescription() {
		if (currentFont == null)
			return "";
		return MessageFormat
				.format("{0}, {1}pt  ", new Object[] {
						currentFont.getFontName(),
						new Integer(currentFont.getSize()) });

	}

	/**
	 * Crear un FontField
	 * 
	 * @param sfmt
	 *            formato para la fecha en el texto.
	 */
	public FontField(Font f) {		
		setLayout(new FlowLayout(0, 0, 0));
		label = new JLabel(getFontDescription());
		label.setMinimumSize(new Dimension(70, 14));
		setFont(f);
		
		URL res = FontField.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) {
			System.err.println("Error al cargar imagen ");
			e.printStackTrace();
		}
		ImageIcon icon = new ImageIcon(img);
		openButton = new JButton(icon); // new JButton("...");
		openButton.setPreferredSize(new Dimension(18, 20));
		add(label);
		add(openButton);
		openButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if (e.getSource() == openButton)
					showHelpWindow();
			}
		});
		label.addMouseListener(new MouseAdapter() {
			public void mouseClicked(MouseEvent e) {
				if (e.getClickCount() >= 2) {
					showHelpWindow();
				}
			}
		});
	}

	public Font getFont() {
		return currentFont;
	}

	public void setFont(Font f) {
		currentFont = f;
		if (label==null)
			return;
		String text = getFontDescription();
		label.setFont(f);
		label.setText(text);
		 
		//Graphics g = label.getGraphics();
		//int w = g.getFontMetrics().stringWidth(text);
		//int h = g.getFontMetrics().getHeight();
		//g.dispose();		
		//label.setPreferredSize(new Dimension(w, h));
	}

	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();
			}
		}
	}

	protected void assignFont(Font f) {
		setFont(f);
		triggerAction();
	}

	// Soporte a la ventana

	/**
	 * Muestra la ventana de ayuda de seleccion de fecha.
	 */
	void showHelpWindow() {
		FontChooserDialog fc = new FontChooserDialog(null);
		fc.setFont(currentFont);
		if (fc.execute()) {
			assignFont(fc.getFont());
		}
	}

	/**
	 * 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 FontField(null));
		f.pack();
		f.setVisible(true);
	}
}