import java.awt.Color;
import java.awt.Graphics;
public class MyProgressBar extends Canvas {
private float scaleSize;
private float currentValue;
public MyProgressBar() {
this(100, 50);
}
public MyProgressBar(float scaleSize, float currentValue) {
this.scaleSize = scaleSize;
this.currentValue = currentValue;
this.setBackground(Color.lightGray);
this.setForeground(Color.magenta);
setSize(150, 25);
}
public float getCurrentValue() {
return currentValue;
}
public void setCurrentValue(float currentValue) {
this.currentValue = Math.max(0, currentValue);
if (this.scaleSize < this.currentValue) {
this.currentValue = this.scaleSize;
}
}
public float getScaleSize() {
return scaleSize;
}
public void setScaleSize(float scaleSize) {
this.scaleSize = Math.max(1.0f, scaleSize);
if (this.scaleSize < this.currentValue) {
this.scaleSize = this.currentValue;
}
}
public synchronized void paint(Graphics g) {
int w = getSize().width;
int h = getSize().height;
g.setColor(getBackground());
g.fillRect(1, 1, w - 2, h - 2);
g.fill3DRect(0, 0, w - 1, h - 1, true);
g.setColor(getForeground());
g.fillRect(3, 3, (int) (currentValue * (w - 6) / scaleSize), h - 6);
}
}
下面是程序執行入口點：
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
public class TestMyProgressBar extends JFrame implements Runnable,
ActionListener {
private MyProgressBar bar;
private JButton btnStart;
static TestMyProgressBar tmpb;
public TestMyProgressBar() {
setSize(400, 300);
setLocation(400, 400);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle("演示自定義進度條");
setLayout(new FlowLayout());
btnStart = new JButton("開始");
this.add(btnStart);
btnStart.addActionListener(this);
bar = new MyProgressBar();
setVisible(true);
}
public static void main(String[] args) {
tmpb = new TestMyProgressBar();
}
@Override
public void run() {
for (int i = 1; i <= 20; i++) {
int x = i * 5;
bar.setCurrentValue(x);
if (x > 0 && x < 100) {
btnStart.setEnabled(false);
}
if (x == 100) {
btnStart.setEnabled(true);
}
try {
Thread.sleep(200);
add(bar);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
@Override
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("開始")) {
Thread t = new Thread(tmpb);
t.start();
}
}
}