TextIcon.java

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import javax.swing.*;
import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;

public class TextIcon implements Icon {
    String text = null;
    boolean border = true;
    Font font = null;
    FontRenderContext fontRenderContext = null;
    Color color = Color.black;

    boolean initialized = false;
    int width = -1;
    int height = -1;

    public TextIcon(String _text, Component c) { 
        setText(_text); 
        setFontRenderContext(c);
    };

    public TextIcon(String _text, Component c, Color col) { 
        setText(_text); 
        setFontRenderContext(c);
        setColor(col);
    };

    public void setColor(Color col) {
        color = col; };
    public Color getColor() { return color; };

    public void setText(String _text) {
        checkChange();
        text = _text; };
    public String getText() { return text; };

    public void setFontRenderContext(FontRenderContext frc) {
        checkChange();
        fontRenderContext = frc; };
    public void setFontRenderContext(Component c) {
        setFontRenderContext(((Graphics2D)c.getGraphics()).getFontRenderContext()); };
    public FontRenderContext getFontRenderContext() {
        return fontRenderContext; };

    private void checkChange() {
        if (initialized) 
            throw new UnsupportedOperationException
                ("Cannot change Icon's parameters after displaying");
    }
    
    private void init() {
        if (initialized) return;
        if (font==null) font = new Font("Dialog",Font.PLAIN,10);
        if (fontRenderContext==null)
            throw new IllegalArgumentException("Need FontRenderContext");
        if (text==null) text = ":)";
        Rectangle2D bounds = 
            font.getStringBounds(text,fontRenderContext);
        //System.out.println("Bounds: "+bounds);
        width = (int)(bounds.getWidth()+bounds.getX()+6);
        height = (int)(bounds.getHeight()+bounds.getY()+10);
        initialized = true;
    }

    public void paintIcon(Component c, Graphics g, int x, int y) {
        init();
        try {
            //System.out.println("paint("+x+","+y+")");
            g.setColor(color);
            if (border)
                g.drawRect(x+1,y+1,width-3,height-2);
            g.setFont(font);
            g.drawString(text,x+3,y+height-3);
        } catch (Throwable e) {
            e.printStackTrace();
        }
    }

    public int getIconWidth() {
        init();
        return width;
    }

    public int getIconHeight() {
        init();
        return height;
    }
}

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