language java nosugar custom button code OvalButton

// 
//	OvalButton class
//	part of the set of documents known as Java no sugar.
//	Copyright (c) 1996 Sunil Gupta, sunil@magnetic.demon.co.uk
//	placed into the public domain by the author
//
import java.awt.*;

public class OvalButton extends Canvas
{
	//##################################################################
	//
	//##################################################################
	private static final int BUTTON_UP = 1;
	private static final int BUTTON_DOWN = 2;
	private static final double ROOT2 = 1.414213562373;
	private static final double FUDGEFACTOR = 1.66666;
	public int CLICK_INTERVAL = 100;			//milliseconds
	
	String caption;
	int button_state = BUTTON_UP;
	long button_down_time;
	
	
	//##################################################################
	//
	//##################################################################
	public OvalButton( String a_string)
	{
		caption = a_string;
	}
	
	//******************************************************************
	// initial size must be set in addNotify, not in constructor or
	// tharr be null pointers
	public void addNotify()
	{
		super.addNotify();
		resize(this.preferredSize());
	}
	
	//******************************************************************
	public void paint (Graphics g)
	{
		Dimension size;
		int x, y, text_width, text_height, oval_width, oval_height;
		FontMetrics metrics;
		Color colour;
		
		//--------------------------------------------------------------
		size = size();
		metrics = getFontMetrics(getFont());
		text_width = metrics.stringWidth(caption);
		text_height = metrics.getHeight();
		
		//------draw button shape --- bugs in oval as you can see.------
		g.setColor( getBackground() );
		g.fillRect(0,0,size.width, size.height); 
		oval_width = size.width - 3;
		oval_height = size.height - 3;
		
		if (button_state == BUTTON_UP)
		{
			g.setColor( Color.white );
			g.fillOval(0,0, oval_width,oval_height);
			g.setColor( Color.gray );
			g.fillOval(2,2,oval_width,oval_height);
		}
		else
		{
			g.setColor( Color.gray );
			g.fillOval(0,0, oval_width,oval_height);
			g.setColor( Color.white );
			g.fillOval(2,2,oval_width,oval_height);
		}
		g.setColor( Color.lightGray );
		g.fillOval(1,1, oval_width,oval_height);
		
		//-------------draw button text---------------------------------
		x = (size.width -  text_width) /2;
		y = (size.height + text_height) /2;
		
		if (button_state == BUTTON_UP)
		{
			g.setColor( Color.gray );
			g.drawString(caption, x-1, y-1);
			g.setColor( Color.white );
			g.drawString(caption, x+1, y+1);
			}
			else
		{
			g.setColor( Color.gray );
			g.drawString(caption, x-1, y-1);
			g.drawString(caption, x+1, y+1);
			}
		
		if ( isEnabled() )
			g.setColor( getForeground() );
		else
			g.setColor( Color.gray );
		g.drawString(caption, x, y);
	}
	
	//******************************************************************
	public Dimension minimumSize()
	{
		return (this.preferredSize());
	}
	
	//******************************************************************
	public Dimension preferredSize()
	{
		int text_width, text_height;
		int oval_width, oval_height;
		FontMetrics metrics;
		Font font;
		Dimension preferred_dim;
		
		font = getFont();
		metrics = getFontMetrics( font);
			
		text_width = metrics.stringWidth(caption);
		text_height = metrics.getHeight();
		oval_width = (int) Math.round( text_width *  ROOT2 * FUDGEFACTOR);
		oval_height = (int) Math.round( text_height *  ROOT2);
		
		preferred_dim = new Dimension( oval_width , oval_height);
		return preferred_dim;
	}
	
	//******************************************************************
	public boolean handleEvent(Event e)
	{
		long time_diff;
		
		switch (e.id)
		{
			case Event.MOUSE_DOWN:
				button_down_time = System.currentTimeMillis();
				button_state = BUTTON_DOWN;
				repaint();				
				return true;
				
			case Event.MOUSE_UP:
				time_diff = System.currentTimeMillis() - button_down_time;
				if (time_diff <= CLICK_INTERVAL)
					postEvent(new Event(this,Event.ACTION_EVENT,this));
				button_state = BUTTON_UP;
				repaint();
				return true;			
				
			default:								
				return super.handleEvent(e);
		}
	}
}

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