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@verborghs
Created October 30, 2019 09:37
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public class AvailabilityChangedArgs : EventArgs
{
public bool SoldOut { get; }
public AvailabilityChangedArgs(bool soldOut)
{
SoldOut = soldOut;
}
}
public class Product
{
private int _available;
public event EventHandler<AvailabilityChangedArgs> AvailabilityChanged;
public Product(string name, int coins, int available)
{
Name = name;
Coins = coins;
Available = available;
}
public string Name { get; }
public int Coins { get; }
public int Available
{
get
{
return _available;
}
set
{
_available = value;
AvailabilityChanged?.Invoke(this, new AvailabilityChangedArgs(Available <= 0));
}
}
}
public class ProductView : MonoBehaviour
{
[SerializeField]
private Text _code;
[SerializeField]
private Text _name;
[SerializeField]
private Text _coins;
[SerializeField]
private Image _panel;
[SerializeField]
private Sprite _productAvailableTexture;
[SerializeField]
private Sprite _productUnavailableTexture;
private Product _product;
public Product Product
{
set
{
RemoveListeners();
_product = value;
AddListener();
_name.text = _product.Name;
_coins.text = "" + _product.Coins;
UpdateAvailabilityIndicator(_product.Available <= 0);
}
}
public string Code
{
set { _code.text = value; }
}
public ProductView Create(Transform parent)
{
GameObject go = Instantiate(this.gameObject, parent);
return go.GetComponent<ProductView>();
}
private void AddListener()
{
_product.AvailabilityChanged += OnAvailabilityChanged;
}
private void RemoveListeners()
{
if (_product != null)
_product.AvailabilityChanged -= OnAvailabilityChanged;
}
private void OnAvailabilityChanged(object sender, AvailabilityChangedArgs evt)
{
UpdateAvailabilityIndicator(evt.SoldOut);
}
private void UpdateAvailabilityIndicator(bool soldOut)
{
_panel.sprite = (soldOut) ? _productUnavailableTexture : _productAvailableTexture;
}
}
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