Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 3

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 * MA  02110-1301, USA.

 *

 * For any additional information, do not hesitate to contact us

 * at info AT gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.gui.beans.controls;

import java.awt.Dimension;

import java.awt.FontMetrics;

import java.awt.Graphics;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.StringReader;

import java.util.Enumeration;

import java.util.Vector;

import javax.swing.JComponent;

import javax.swing.JToolTip;

import javax.swing.SwingUtilities;

import javax.swing.plaf.metal.MetalToolTipUI;

/**

 * <p>

 * Allows using more than one line length tooltips. It also automatically

 * calculates the size of the screen rectangle used and the preferred sized up

 * on the contained text. It does NOT format the text to fit within a given

 * size. The user must provide the text as she/he wishes to show it.

 * </p>

 * <p>

 * It means that new line characters must be placed in the string as well as it

 * was a System.out.println statement.

 * </p>

 * @author jaume dominguez faus - jaume.dominguez@iver.es

 */

public class MultiLineToolTip extends JToolTip {

        private static final long serialVersionUID = -3727623742187461577L;

        public MultiLineToolTip() {

                setUI(new MultiLineToolTipUI());

        }

        private class MultiLineToolTipUI extends MetalToolTipUI {

                private String[] strs;

                public void paint(Graphics g, JComponent c) {

                        FontMetrics metrics = g.getFontMetrics();

                        Dimension size = c.getSize();

                        g.setColor(c.getBackground());

                        g.fillRect(0, 0, size.width, size.height);

                        g.setColor(c.getForeground());

                        if (strs != null) {

                                for (int i = 0; i < strs.length; i++) {

                                        g.drawString(strs[i], 3, (metrics.getHeight()) * (i + 1));

                                }

                        }

                }

                public Dimension getPreferredSize(JComponent c) {

                        FontMetrics metrics = c.getFontMetrics(c.getFont());

                        String tipText = ((JToolTip) c).getTipText();

                        if (tipText == null) {

                                tipText = "";

                        }

                        BufferedReader br = new BufferedReader(new StringReader(tipText));

                        String line;

                        int _maxWidth = 0;

                        Vector v = new Vector();

                        try {

                                while ((line = br.readLine()) != null) {

                                        int width = SwingUtilities.computeStringWidth(metrics, line);

                                        _maxWidth = (_maxWidth < width) ? width : _maxWidth;

                                        v.addElement(line);

                                }

                        } catch (IOException ex) {

                                ex.printStackTrace();

                        }

                        int lines = v.size();

                        if (lines < 1) {

                                strs = null;

                                lines = 1;

                        } else {

                                strs = new String[lines];

                                int i = 0;

                                for (Enumeration e = v.elements(); e.hasMoreElements(); i++) {

                                        strs[i] = (String) e.nextElement();

                                }

                        }

                        int height = metrics.getHeight() * lines;

                        return new Dimension(_maxWidth + 6, height + 4);

                }

        }

}