Language Java Nosugar Custom Progress Code Progressbar.java

// 
//	ProgressBar class
//	part of the set of documents known as Java no sugar.
//	Copyright (c) 1996,1997 Sunil Gupta, sunil@magnetic.demon.co.uk
//	placed into the public domain by the author
//
import java.awt.*;

public class ProgressBar extends Canvas
{
	//##################################################################
	//
	//##################################################################
	public static final int HORIZONTAL = 0;
	public static final int VERTICAL = 1;
	public static final int SOLID = 2;
	public static final int SLATTED = 3;
	
	private int percentage = 0;
	private int style = SOLID;
	private int orientation = HORIZONTAL;
	private Color bar_colour = Color.blue;
	private Color border_colour = Color.gray;
	private int slat_gap = 2; // pixels;
	private int slat_width = 10; // pixels;
	
	
	//##################################################################
	//
	//##################################################################
	public ProgressBar( int orientation)
	{
		this.orientation = orientation;
	}
	
	public ProgressBar( int orientation, int style)
	{
		this(orientation);
		this.style = style;
	}
	
	//******************************************************************
	// 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 bar_width, bar_height;
		
		size = size();
		
		//---------figure out the size of the bar------------------------------
		if (orientation == HORIZONTAL)
		{
			bar_height = size.height;
			bar_width = (int) Math.round( (double)percentage/100.0 * (double)size.width);
		}
		else
		{
			bar_width = size.width;
			bar_height = (int) Math.round( (double)percentage/100.0 * (double)size.height);
		}
		
		//---------draw bar-----------------------------------------------------
		g.setColor( bar_colour);
		
		switch (style)
		{
			case SLATTED:
				if (orientation == HORIZONTAL)
					horizontal_slats(g, bar_width, bar_height);
				else
					vertical_slats(g, bar_width, bar_height, size.height);
				break;
				
			case SOLID:
			default:
				if (orientation == VERTICAL)
					g.fillRect(1, size.height-2-bar_height , bar_width-2, bar_height);
				else
					g.fillRect(1,1, bar_width-2, bar_height-2);
				break;
		}

		
		g.setColor( border_colour);
		g.draw3DRect(0,0,size.width-1, size.height-1, false);
		
	}
	
	
	//******************************************************************
	public Dimension minimumSize()
	{
		if (orientation == HORIZONTAL)
			return ( new Dimension (100,40));
		else
			return ( new Dimension (40,100));
	}
	
	//******************************************************************
	public Dimension preferredSize()
	{
		return minimumSize();
	}
	
	//******************************************************************
	public void randomize()
	{
		percentage = (int) Math.round(Math.random() * 100.0);
	}
	
	//******************************************************************
	public void increment()
	{
		if (percentage < 100)
		{
			percentage++;
			repaint();
		}
	}

	//******************************************************************
	public void decrement()
	{
		if (percentage > 0)
		{
			percentage--;
			repaint();
		}
	}

	//******************************************************************
	private void horizontal_slats( Graphics g, int width, int height)
	{
		int x = width;
		
		while (x > 1)
		{
			g.fillRect( x-slat_width, 1, slat_width, height-2);
			x -= (slat_width + slat_gap);
		}
	}

	//******************************************************************
	private void vertical_slats( Graphics g, int width, int height, int ymax)
	{
		int y = ymax-height;
		
		while (y < ymax)
		{
			g.fillRect( 1, y, width-2, slat_width);
			y += (slat_width + slat_gap);
		}
	}
	
	
}

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