Application: gvSIG desktop

package es.prodevelop.cit.gvsig.arcims.gui.panels.utils;

import java.awt.Dimension;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.Insets;

import javax.swing.CellRendererPane;

import javax.swing.JComponent;

import javax.swing.JTextArea;

import javax.swing.JToolTip;

import javax.swing.plaf.ComponentUI;

import javax.swing.plaf.basic.*;

/**

 * This class allows nice multiline tool tips.

 * 

 * @author Zafir Anjum

 * @author jldominguez

 */

public class MultilineToolTipUI extends BasicToolTipUI {

        static MultilineToolTipUI sharedInstance = new MultilineToolTipUI();

        Font smallFont = new Font("Dialog", Font.PLAIN, 12);

        // Dialog, SansSerif - similar to Arial

        // DialogInput, Monospaced - similar to Courier

        // Serif - similar to Times New Roman 

        static JToolTip tip;

        protected CellRendererPane rendererPane;

        private static JTextArea textArea;

        public static ComponentUI createUI(JComponent c) {

                return sharedInstance;

        }

        public MultilineToolTipUI() {

                super();

        }

        public void installUI(JComponent c) {

                super.installUI(c);

                tip = (JToolTip) c;

                rendererPane = new CellRendererPane();

                c.add(rendererPane);

        }

        public void uninstallUI(JComponent c) {

                super.uninstallUI(c);

                c.remove(rendererPane);

                rendererPane = null;

        }

        public void paint(Graphics g, JComponent c) {

                Dimension size = c.getSize();

                rendererPane.paintComponent(g, textArea, c, 1, 1, size.width - 1,

                                size.height - 1, true);

        }

        /**

         * Overrides a method that is called by the system and,

         * at the same time, creates a nice textarea and displays the tool tip in it.

         */

        public Dimension getPreferredSize(JComponent c) {

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

                if (tipText == null)

                        return new Dimension(0, 0);

                textArea = new JTextArea(tipText);

                textArea.setMargin(new Insets(10, 10, 10, 10));

                textArea.setBackground(tip.getBackground());

                rendererPane.removeAll();

                rendererPane.add(textArea);

                textArea.setWrapStyleWord(true);

                textArea.setFont(smallFont);

                int width = ((JMultilineToolTip) c).getFixedWidth();

                int columns = ((JMultilineToolTip) c).getColumns();

                if (columns > 0) {

                        textArea.setColumns(columns);

                        textArea.setSize(0, 0);

                        textArea.setLineWrap(true);

                        textArea.setSize(textArea.getPreferredSize());

                } else if (width > 0) {

                        textArea.setLineWrap(true);

                        Dimension d = textArea.getPreferredSize();

                        d.width = width;

                        d.height++;

                        textArea.setSize(d);

                } else

                        textArea.setLineWrap(false);

                Dimension dim = textArea.getPreferredSize();

                dim.height += 1; 

                dim.width += 1; 

                return dim;

        }

        public Dimension getMinimumSize(JComponent c) {

                return getPreferredSize(c);

        }

        public Dimension getMaximumSize(JComponent c) {

                return getPreferredSize(c);

        }

}