AutoReducingValue.java

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package com.fs.starfarer.api.util;
 
 
public class AutoReducingValue {
 
    public static interface ValueChangedListener {
        void valueChanged(int prev, int val, AutoReducingValue arv);
    }
    
    private float elapsed = 0f;
    private int value = 0;
    private float elapsedPerPoint;
    private final ValueChangedListener listener;
    
 
    public AutoReducingValue(int value, float elapsedPerPoint, ValueChangedListener listener) {
        this.value = value;
        this.elapsedPerPoint = elapsedPerPoint;
        this.listener = listener;
    }
 
    public void advance(float amount) {
        elapsed += amount;
        
        if (elapsed >= elapsedPerPoint) {
            elapsed -= elapsedPerPoint;
            
            int prev = value;
            value--;
            if (value < 0) value = 0;
            if (prev != value && listener != null) {
                listener.valueChanged(prev, value, this);
            }
        }
    }
    
    public int getValue() {
        return value;
    }
 
    public void setValue(int value) {
        int prev = value;
        this.value = value;
        if (prev != value && listener != null) {
            listener.valueChanged(prev, value, this);
        }
    }
    
    public void increaseValue(int amt) {
        int prev = value;
        this.value += amt;
        if (value < 0) {
            value = 0;
        }
        if (prev != value && listener != null) {
            listener.valueChanged(prev, value, this);
        }
    }
    
    public void reduceValue(int amt) {
        int prev = value;
        this.value -= amt;
        if (value < 0) {
            value = 0;
        }
        if (prev != value && listener != null) {
            listener.valueChanged(prev, value, this);
        }
    }
    
}