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package aurelienribon.utils.swing;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JPanel;
import javax.swing.Timer;
/**
* @author Aurelien Ribon | http://www.aurelienribon.com
*/
public abstract class DrawingCanvas extends JPanel {
private final Timer timer;
private long lastMillis;
private Callback callback;
public DrawingCanvas() {
timer = new Timer(1000/60, loop);
timer.setRepeats(true);
}
protected abstract void update(int elapsedMillis);
public DrawingCanvas start() {
lastMillis = System.currentTimeMillis();
timer.start();
return this;
}
public void stop() {
timer.stop();
}
public void setCallback(Callback callback) {
this.callback = callback;
}
private final ActionListener loop = new ActionListener() {
@Override public void actionPerformed(ActionEvent e) {
final long millis = System.currentTimeMillis();
final long delta = millis - lastMillis;
lastMillis = millis;
update((int) delta);
if (callback != null) callback.onUpdate((int) delta);
}
};
public interface Callback {
public void onUpdate(int elapsedMillis);
}
}
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