NguiFillAmountBinding

using UnityEngine;
using System;
using System.Collections;
using System.Collections.Generic;

[System.Serializable]
[AddComponentMenu("NGUI/NData/FillAmout Binding")]
public class NguiFillAmountBinding : NguiBinding
{
    private EZData.Property<float> _property;

    private float _prevValue = -1.0f;
    private bool _ignoreChanges = false;

    private UIFilledSprite _UiFilledSpriteReceiver;

    public float Min = 0;
    public float Max = 1;

    private float DataToSlider(float data)
    {
        if (Mathf.Abs(Max - Min) < float.Epsilon)
            return 0.0f;

        return (data - Min) / (Max - Min);
    }

    private float SliderToData(float value)
    {
        if (Mathf.Abs(Max - Min) < float.Epsilon)
            return 0.0f;

        return Min + value * (Max - Min);
    }

    public override void Awake()
    {
        base.Awake();

        _UiFilledSpriteReceiver = gameObject.GetComponent<UIFilledSprite>();
    }

    public override void UpdateBinding()
    {
        _property = null;

        var context = GetContext();
        if (context == null)
        {
            Debug.LogWarning("NuiFillAmountBinding.UpdateBinding - context is null");
            return;
        }

        _property = context.FindProperty<float>(Path, this);

        if (_property != null)
        {
            _property.OnChange += OnChange;
        }
        OnChange();
    }

    void Update()
    {
        if (_UiFilledSpriteReceiver != null && _property != null)
        {
            if (_prevValue != _UiFilledSpriteReceiver.fillAmount)
            {
                _prevValue = _UiFilledSpriteReceiver.fillAmount;
                _ignoreChanges = true;
                _property.SetValue(SliderToData(_UiFilledSpriteReceiver.fillAmount));
                _ignoreChanges = false;
            }
        }
    }

    public void OnChange()
    {
        if (_ignoreChanges)
            return;

        if (_property == null || _UiFilledSpriteReceiver == null)
            return;

        _UiFilledSpriteReceiver.fillAmount = DataToSlider(_property.GetValue());
    }
}