package slider;

import java.util.List;
import java.util.LinkedList;

public class SliderModel {
 String title = "Title to Be Supplied"; 
 int minValue;
 int maxValue;
 int value; 
 // observers is a list of views that want to be notified of changes
 // to the model
 List<SliderView> observers = new LinkedList<SliderView>();

 public SliderModel (int minV, int maxV, int startV, String label) {
     minValue = minV;
     maxValue = maxV;
     value = startV;
     title = label;
 } 
 
    public int getValue() { return value; }
    public int getMinValue() { return minValue; }
    public int getMaxValue() { return maxValue; }
    public String getTitle() { return title; }

 public void setValue(int v) {
     // notify observers that the value has changed and pass them the *old*
     // value. They can query for the new value at their leisure
     int old_value = value;
     value = v; 
     for (SliderView observer: observers) {
	 observer.valueChanged(old_value);
     }
 } 
 public void setTitle(String t) {
     // notify observers that the value has changed and pass them the *old*
     // value. They can query for the new value at their leisure
     String old_title = title;
     title = t;
     for (SliderView observer: observers) {
	 observer.titleChanged(old_title);
     }
 }
 public void addObserver(SliderView view) {
     observers.add(view);
 }
}