TextFormat.java Source code

Introduction

Here is the source code for TextFormat.java

Source

/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */

import java.awt.Component;
import java.awt.Container;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.font.FontRenderContext;
import java.awt.font.LineBreakMeasurer;
import java.awt.font.TextAttribute;
import java.awt.font.TextLayout;
import java.text.AttributedString;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import javax.swing.JFrame;

/**
 * A display of text, formatted by us instead of by AWT/Swing.
 * <P>
 * This program is distributed under the terms of the accompanying COPYRIGHT.txt
 * file (which is NOT the GNU General Public License). Please read it. Your use
 * of the software constitutes acceptance of the terms in the COPYRIGHT.txt
 * file.
 * 
 * @author Ian F. Darwin
 * @version $Id: TextFormat.java,v 1.3 2004/03/26 03:34:30 ian Exp $
 */
public class TextFormat extends Component {

    /** The text of this line */
    protected String text;

    /** The Font */
    protected Font font;

    /** The TextLayouts corresponding to "text" */
    List layouts;

    public Font getFont() {
        return font;
    }

    public void setFont(Font f) {
        font = f;
    }

    public String getText() {
        return text;
    }

    public void setText(String t) {
        text = t;
    }

    public void paint(Graphics g) {
        if (text == null || text.length() == 0)
            return;
        if (layouts == null)
            getLayouts(g);

        Point pen = new Point(0, 0);
        Graphics2D g2d = (Graphics2D) g;
        g2d.setColor(java.awt.Color.black); // or a property
        g2d.setFont(font);

        Iterator it = layouts.iterator();
        while (it.hasNext()) {
            TextLayout layout = (TextLayout) it.next();
            pen.y += (layout.getAscent());
            g2d.setFont(font);
            layout.draw(g2d, pen.x, pen.y);
            pen.y += layout.getDescent();
            //pen.y += leading;
        }
    }

    /**
     * Lazy evaluation of the List of TextLayout objects corresponding to this
     * MText. Some things are approximations!
     */
    private void getLayouts(Graphics g) {
        layouts = new ArrayList();

        Point pen = new Point(10, 20);
        Graphics2D g2d = (Graphics2D) g;
        FontRenderContext frc = g2d.getFontRenderContext();

        AttributedString attrStr = new AttributedString(text);
        attrStr.addAttribute(TextAttribute.FONT, font, 0, text.length());
        LineBreakMeasurer measurer = new LineBreakMeasurer(attrStr.getIterator(), frc);
        float wrappingWidth;

        wrappingWidth = getSize().width - 15;

        while (measurer.getPosition() < text.length()) {
            TextLayout layout = measurer.nextLayout(wrappingWidth);
            layouts.add(layout);
        }
    }

    public static void main(String[] args) {
        JFrame jf = new JFrame("Demo");
        Container cp = jf.getContentPane();
        TextFormat tl = new TextFormat();
        tl.setFont(new Font("SansSerif", Font.BOLD, 42));
        tl.setText("The quick brown fox jumped over the lazy cow");
        cp.add(tl);
        jf.setSize(300, 200);
        jf.setVisible(true);
    }
}