Main.java

package net.sf.lab3f.gwt.counter.client;

import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.client.ui.HasHorizontalAlignment;

public class Main extends FlexTable{ 

 private int length;
 private int value;
 private Image[] digits = new Image[10];

 public Main (String label, int n, int v){
  super();
  for(int i = 0; i < 10; i++) digits[i] = new Image("img/" + i + ".gif");
  length = n;
  addStyleDependentName("counter");
  setLabel(label);
  setValue(v);
 }
 
 public int  getValue(){return value;}
 
 public void setValue(int v){
  value = v;
  String s = "" + v;
  while(s.length() < length) s = "0" + s;
  for(int i = 0; i < length; i++){
   Image im = new Image("img/" + s.charAt(i) + ".gif");
   setWidget(1, i, im);
  }
 }

 private void setLabel(String label){
  if(label == null)return;	 
  Label l = new Label(label);
  l.addStyleDependentName("counter");
  getFlexCellFormatter().setColSpan(0, 0, length);
  getCellFormatter().setHorizontalAlignment(0, 0, HasHorizontalAlignment.ALIGN_CENTER);
  setWidget(0, 0, l);
 }

 private Timer timer = new Timer(){
  public void run(){
   if(value < 1){cancel();return;}
   setValue(--value);
  }
 };

 public void countDown(){timer.cancel();timer.scheduleRepeating(1000);}
 public void stopCountDown(){timer.cancel();} 
}