ProgressBar.java

package ij.gui;

import java.awt.*;
import java.awt.image.*;

public class ProgressBar extends Canvas {

    private int canvasWidth, canvasHeight;
    private int x, y, width, height;
    private double percent;
    private long startTime;
    private int count;
    private boolean showBar;
    private boolean negativeProgress;
    private static boolean autoHide;
    
    private Color barColor = Color.gray;
    private Color fillColor = new Color(204,204,255);
    private Color backgroundColor = ij.ImageJ.backgroundColor;
    private Color frameBrighter = backgroundColor.brighter();
    private Color frameDarker = backgroundColor.darker();

    public ProgressBar(int canvasWidth, int canvasHeight) {
        this.canvasWidth = canvasWidth;
        this.canvasHeight = canvasHeight;
        x = 3;
        y = 5;
        width = canvasWidth - 8;
        height = canvasHeight - 7;
        showBar = false;
        negativeProgress = false;
        count = 0;
        percent = 0.0;
    }
        
    void fill3DRect(Graphics g, int x, int y, int width, int height) {
        g.setColor(fillColor);
        g.fillRect(x+1, y+1, width-2, height-2);
        g.setColor(frameDarker);
        g.drawLine(x, y, x, y+height);
        g.drawLine(x+1, y, x+width-1, y);
        g.setColor(frameBrighter);
        g.drawLine(x+1, y+height, x+width, y+height);
        g.drawLine(x+width, y, x+width, y+height-1);
    }    

    public void show(int currentValue, int finalValue) {
        if (currentValue>=finalValue)
            showBar = false;
        else {
            percent = Math.min((currentValue+1)/(double)finalValue, 1.0);
            showBar = true;
        }
        repaint();
    }

    public void show(double percent) {
        count++;
        if (count==1) {
            //ij.IJ.log("");
            //ij.IJ.log("1st call");
            startTime = System.currentTimeMillis();
            showBar = false;
        }
        else if (count==2) {
            long time2 = System.currentTimeMillis();
            //ij.IJ.log("2nd call: "+(time2 - startTime) + "ms");
            if ((time2 - startTime)>=30)
                showBar = true;
        }
        
        negativeProgress = percent<this.percent;
        this.percent = percent;
        if (percent>=1.0) {
            //ij.IJ.log("total calls: "+count);
            count = 0;
            percent = 0.0;
            showBar = false;
            repaint();
        } else if (showBar)
            repaint();
    }

    public void update(Graphics g) {
        paint(g);
    }

    public void paint(Graphics g) {
        if (showBar) {
            fill3DRect(g, x-1, y-1, width+1, height+1);
            drawBar(g);
        } else {
            g.setColor(backgroundColor);
            g.fillRect(0, 0, canvasWidth, canvasHeight);
        }
    }

    void drawBar(Graphics g) {
        if (percent<0.0)
            percent = 0.0;
        int barEnd = (int)(width*percent);
        if (negativeProgress) {
            g.setColor(fillColor);
            g.fillRect(barEnd+2, y, width-barEnd, height);
        } else {
            g.setColor(barColor);
            g.fillRect(x, y, barEnd, height);
        }
    }
    
    public Dimension getPreferredSize() {
        return new Dimension(canvasWidth, canvasHeight);
    }

}