cz/vutbr/fit/dudka/SGVis/Visual/StatusManager.java

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package cz.vutbr.fit.dudka.SGVis.Visual;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;

import javax.swing.Timer;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

class StatusManager {
  public static int DEF_TIMEOUT = 2500;
  
  private String statusText;
  private boolean statusErr;
  private ArrayList<ChangeListener> statusListeners;
  private final GraphView gview;
  private int timeout;
  private Timer timer;
  
  public StatusManager(GraphView gview) {
    this.gview = gview;
    this.timeout = DEF_TIMEOUT;
    this.timer = null;
    statusListeners = new ArrayList<ChangeListener>(); 
  }
  
  public synchronized int getTimeout() {
    return timeout;
  }
  
  public synchronized void setTimeout(int timeout) {
    this.timeout = timeout;
  }
  
  public synchronized void addListener(ChangeListener listener) {
    this.statusListeners.add(listener);
  }

  public synchronized void setStatus() {
    this.destroyTimer();
    this.setStatus(" ");
  }
  
  public synchronized void setStatus(String status) {
    this.destroyTimer();
    this.setStatus(status, false);
  }
  
  public synchronized void showStatus(String status) {
    this.showStatus(status, this.timeout);
  }
  
  public synchronized void showStatus(String status, int timeout) {
    this.destroyTimer();
    this.setStatus(status);
    this.initTimer(timeout);
  }
  
  public synchronized void showErrror(String text) {
    this.destroyTimer();
    this.setStatus(text, true);
  }
  
  public synchronized String getStatus() {
    return this.statusText;
  }
  
  public synchronized boolean isStatusError() {
    return this.statusErr;
  }
  
  private synchronized void setStatus(String status, boolean err) {
    this.statusText = status;
    this.statusErr = err;
    for (ChangeListener listener: statusListeners)
      listener.stateChanged(new ChangeEvent(gview));
  }
  private synchronized void destroyTimer() {
    if (null==timer)
      return;
    timer.stop();
    timer = null;
  }
  private synchronized void initTimer(int timeout) {
    final StatusManager sm = this;
    ActionListener timerListener = new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        sm.setStatus();
      }
    };
    timer = new Timer(timeout, timerListener);
    timer.start();
  }
}

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