progressbar.java

这是linux下ssl vpn的实现程序

package com.sshtools.ui.awt;

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Rectangle;

public class ProgressBar extends Canvas {

  public ProgressBar(int min, int max, int val) {
    this.min = min;
    this.max = max;
    this.val = val;
  }

  public Dimension getPreferredSize() {
    return new Dimension(100, 16);
  }

  public Dimension getMinimumSize() {
    return new Dimension(super.getMinimumSize().width, 16);
  }

  public int getMax() {
    return max;
  }

  public void setMax(int max) {
    this.max = max;
    repaint();
  }

  public int getMin() {
    return min;
  }

  public void setMin(int min) {
    this.min = min;
    repaint();
  }

  public int getVal() {
    return val;
  }

  public void setVal(int val) {
    this.val = val;
    paintAll(getGraphics());
  }

  public Color getProgressColor() {
    return progressColor;
  }

  public void setProgressColor(Color progressColor) {
    this.progressColor = progressColor;
    repaint();
  }

  public String getProgressString() {
    return progressString;
  }

  public void setProgressString(String progressString) {
    this.progressString = progressString;
    repaint();
  }

  public void paint(Graphics g) {
    super.paint(g);
    Rectangle bounds = getBounds();
    g.setColor(getForeground());
    g.drawRect(0, 0, bounds.width, bounds.height);
    g.setColor(progressColor != null ? progressColor : Color.blue);
    float scale = (float) val / ((float) max - (float) min);
    g.fillRect(1, 1, (int) ((float) (bounds.width - 2) * scale),
        bounds.height - 2);
    String s = progressString != null ? progressString : (int) (scale * 100F)
        + "%";
    FontMetrics fm = getFontMetrics(getFont());
    int swidth = fm.stringWidth(s);
    g.setColor(getForeground());
    g.drawString(s, (bounds.width - swidth) / 2, bounds.height / 2
        + ( fm.getMaxAscent() / 2));
  }

  private int min;
  private int max;
  private int val;
  private Color progressColor;
  private String progressString;
}