package bluej.groupwork.ui;

import javafx.animation.Animation;
import javafx.animation.KeyFrame;
import javafx.animation.KeyValue;
import javafx.animation.Timeline;
import javafx.scene.control.Label;
import javafx.scene.control.ProgressBar;
import javafx.scene.layout.StackPane;
import javafx.util.Duration;

import threadchecker.OnThread;
import threadchecker.Tag;

@OnThread(Tag.FXPlatform)
public class ActivityIndicator
extends StackPane{    
   private ProgressBar progressBar;
   
   private Label messageLabel;
   
   private Timeline animation;

   
   public ActivityIndicator()
   {        
      progressBar = new ProgressBar();
      progressBar.setVisible(false);
      getChildren().add(progressBar);
       
      messageLabel = new Label();
      messageLabel.setVisible(false);
      getChildren().add(messageLabel);     
      }
    
   
   


| Set the activity indicator's running state. This is safe to call
| from any thread.
|
| @param running  The new running state
|
public void setRunning(boolean running)
   {
      messageLabel.setVisible(!running);
      progressBar.setVisible(running);
      if (animation != null)
       {
         
         animation.stop();
           
         animation = null;         
         }
        
      if (running)
       {            
         animation = new Timeline(
               
         new KeyFrame(Duration.ZERO, new KeyValue(progressBar.progressProperty(), 0.0)),
               
         new KeyFrame(Duration.millis(1000), new KeyValue(progressBar.progressProperty(), 1.0)));
         animation.setAutoReverse(true);
         animation.setCycleCount(Animation.INDEFINITE);
         animation.playFromStart();         
         }     
      }
   
   


| Set message to display when the activity indicator is not in a running state.
| @param msg
|
public void setMessage(String msg)
   {
      if (msg != null){
         messageLabel.setText(msg);         
         }     
      } 
   }