texttitle.java

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/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation; either version 2.1 of the License, or 
 * (at your option) any later version.
 *
 * This library 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 Lesser General Public 
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License 
 * along with this library; if not, write to the Free Software Foundation, 
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * --------------
 * TextTitle.java
 * --------------
 * (C) Copyright 2000-2005, by David Berry and Contributors.
 *
 * Original Author:  David Berry;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *                   Nicolas Brodu;
 *
 * $Id: TextTitle.java,v 1.16 2005/05/19 15:44:59 mungady Exp $
 *
 * Changes (from 18-Sep-2001)
 * --------------------------
 * 18-Sep-2001 : Added standard header (DG);
 * 07-Nov-2001 : Separated the JCommon Class Library classes, JFreeChart now 
 *               requires jcommon.jar (DG);
 * 09-Jan-2002 : Updated Javadoc comments (DG);
 * 07-Feb-2002 : Changed Insets --> Spacer in AbstractTitle.java (DG);
 * 06-Mar-2002 : Updated import statements (DG);
 * 25-Jun-2002 : Removed redundant imports (DG);
 * 18-Sep-2002 : Fixed errors reported by Checkstyle (DG);
 * 28-Oct-2002 : Small modifications while changing JFreeChart class (DG);
 * 13-Mar-2003 : Changed width used for relative spacing to fix bug 703050 (DG);
 * 26-Mar-2003 : Implemented Serializable (DG);
 * 15-Jul-2003 : Fixed null pointer exception (DG);
 * 11-Sep-2003 : Implemented Cloneable (NB)
 * 22-Sep-2003 : Added checks for null values and throw nullpointer 
 *               exceptions (TM); 
 *               Background paint was not serialized.
 * 07-Oct-2003 : Added fix for exception caused by empty string in title (DG);
 * 29-Oct-2003 : Added workaround for text alignment in PDF output (DG);
 * 03-Feb-2004 : Fixed bug in getPreferredWidth() method (DG);
 * 17-Feb-2004 : Added clone() method and fixed bug in equals() method (DG);
 * 01-Apr-2004 : Changed java.awt.geom.Dimension2D to org.jfree.ui.Size2D 
 *               because of JDK bug 4976448 which persists on JDK 1.3.1.  Also
 *               fixed bug in getPreferredHeight() method (DG);
 * 29-Apr-2004 : Fixed bug in getPreferredWidth() method - see bug id 
 *               944173 (DG);
 * 11-Jan-2005 : Removed deprecated code in preparation for the 1.0.0 
 *               release (DG);
 * 08-Feb-2005 : Updated for changes in RectangleConstraint class (DG);
 * 11-Feb-2005 : Implemented PublicCloneable (DG);
 * 20-Apr-2005 : Added support for tooltips (DG);
 * 26-Apr-2005 : Removed LOGGER (DG);
 * 
 */

package org.jfree.chart.title;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

import org.jfree.chart.block.BlockResult;
import org.jfree.chart.block.EntityBlockParams;
import org.jfree.chart.block.LengthConstraintType;
import org.jfree.chart.block.RectangleConstraint;
import org.jfree.chart.entity.ChartEntity;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.event.TitleChangeEvent;
import org.jfree.io.SerialUtilities;
import org.jfree.text.G2TextMeasurer;
import org.jfree.text.TextBlock;
import org.jfree.text.TextBlockAnchor;
import org.jfree.text.TextUtilities;
import org.jfree.ui.HorizontalAlignment;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.RectangleInsets;
import org.jfree.ui.Size2D;
import org.jfree.ui.VerticalAlignment;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PublicCloneable;

/**
 * A chart title that displays a text string with automatic wrapping as 
 * required.
 */
public class TextTitle extends Title 
                       implements Serializable, Cloneable, PublicCloneable {

    /** For serialization. */
    private static final long serialVersionUID = 8372008692127477443L;
    
    /** The default font. */
    public static final Font DEFAULT_FONT 
        = new Font("SansSerif", Font.BOLD, 12);

    /** The default text color. */
    public static final Paint DEFAULT_TEXT_PAINT = Color.black;

    /** The title text. */
    private String text;

    /** The font used to display the title. */
    private Font font;

    /** The paint used to display the title text. */
    private transient Paint paint;

    /** The background paint. */
    private transient Paint backgroundPaint;

    /** The tool tip text (can be <code>null</code>). */
    private String toolTipText;
    
    /** The URL text (can be <code>null</code>). */
    private String urlText;
    
    /** The content. */
    private TextBlock content;
    
    /**
     * Creates a new title, using default attributes where necessary.
     */
    public TextTitle() {
        this("");
    }

    /**
     * Creates a new title, using default attributes where necessary.
     *
     * @param text  the title text (<code>null</code> not permitted).
     */
    public TextTitle(String text) {
        this(
            text,
            TextTitle.DEFAULT_FONT,
            TextTitle.DEFAULT_TEXT_PAINT,
            Title.DEFAULT_POSITION,
            Title.DEFAULT_HORIZONTAL_ALIGNMENT,
            Title.DEFAULT_VERTICAL_ALIGNMENT,
            Title.DEFAULT_PADDING
        );
    }

    /**
     * Creates a new title, using default attributes where necessary.
     *
     * @param text  the title text (<code>null</code> not permitted).
     * @param font  the title font (<code>null</code> not permitted).
     */
    public TextTitle(String text, Font font) {

        this(
            text, font,
            TextTitle.DEFAULT_TEXT_PAINT,
            Title.DEFAULT_POSITION,
            Title.DEFAULT_HORIZONTAL_ALIGNMENT,
            Title.DEFAULT_VERTICAL_ALIGNMENT,
            Title.DEFAULT_PADDING
        );

    }

    /**
     * Creates a new title.
     *
     * @param text  the text for the title (<code>null</code> not permitted).
     * @param font  the title font (<code>null</code> not permitted).
     * @param paint  the title paint (<code>null</code> not permitted).
     * @param position  the title position (<code>null</code> not permitted).
     * @param horizontalAlignment  the horizontal alignment (<code>null</code> 
     *                             not permitted).
     * @param verticalAlignment  the vertical alignment (<code>null</code> not 
     *                           permitted).
     * @param padding  the space to leave around the outside of the title.
     */
    public TextTitle(String text, 
                     Font font, 
                     Paint paint, 
                     RectangleEdge position,
                     HorizontalAlignment horizontalAlignment, 
                     VerticalAlignment verticalAlignment,
                     RectangleInsets padding) {

        super(position, horizontalAlignment, verticalAlignment, padding);
        
        if (text == null) {
            throw new NullPointerException("Null 'text' argument.");
        }
        if (font == null) {
            throw new NullPointerException("Null 'font' argument.");
        }
        if (paint == null) {
            throw new NullPointerException("Null 'paint' argument.");
        }
        this.text = text;
        this.font = font;
        this.paint = paint;
        this.backgroundPaint = null;
        this.content = null;
        this.toolTipText = null;
        this.urlText = null;
        
    }

    /**
     * Returns the title text.
     *
     * @return The text (never <code>null</code>).
     */
    public String getText() {
        return this.text;
    }

    /**
     * Sets the title to the specified text and sends a 
     * {@link TitleChangeEvent} to all registered listeners.
     *
     * @param text  the text (<code>null</code> not permitted).
     */
    public void setText(String text) {
        if (text == null) {
            throw new NullPointerException("Null 'text' argument.");
        }
        if (!this.text.equals(text)) {
            this.text = text;
            notifyListeners(new TitleChangeEvent(this));
        }
    }

    /**
     * Returns the font used to display the title string.
     *
     * @return The font (never <code>null</code>).
     */
    public Font getFont() {
        return this.font;
    }

    /**
     * Sets the font used to display the title string.  Registered listeners 
     * are notified that the title has been modified.
     *
     * @param font  the new font (<code>null</code> not permitted).
     */
    public void setFont(Font font) {
        if (font == null) {
            throw new IllegalArgumentException("Null 'font' argument.");
        }
        if (!this.font.equals(font)) {
            this.font = font;
            notifyListeners(new TitleChangeEvent(this));
        }
    }

    /**
     * Returns the paint used to display the title string.
     *
     * @return The paint (never <code>null</code>).
     */
    public Paint getPaint() {
        return this.paint;
    }

    /**
     * Sets the paint used to display the title string.  Registered listeners 
     * are notified that the title has been modified.
     *
     * @param paint  the new paint (<code>null</code> not permitted).
     */
    public void setPaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        if (!this.paint.equals(paint)) {
            this.paint = paint;
            notifyListeners(new TitleChangeEvent(this));
        }
    }

    /**
     * Returns the background paint.
     *
     * @return The paint (possibly <code>null</code>).
     */
    public Paint getBackgroundPaint() {
        return this.backgroundPaint;
    }

    /**
     * Sets the background paint and sends a {@link TitleChangeEvent} to all 
     * registered listeners.  If you set this attribute to <code>null</code>, 
     * no background is painted (which makes the title background transparent).
     *
     * @param paint  the background paint (<code>null</code> permitted).
     */
    public void setBackgroundPaint(Paint paint) {
        this.backgroundPaint = paint;
        notifyListeners(new TitleChangeEvent(this));
    }
    
    /**
     * Returns the tool tip text.
     *
     * @return The tool tip text (possibly <code>null</code>).
     */
    public String getToolTipText() {
        return this.toolTipText;
    }

    /**
     * Sets the tool tip text to the specified text and sends a 
     * {@link TitleChangeEvent} to all registered listeners.
     *
     * @param text  the text (<code>null</code> permitted).
     */