public ShoppingCartEntryViewModel(ShoppingCart shoppingCart, ShoppingCartEntry entry)
{
_shoppingCart = shoppingCart;
this.ProductViewModel = new ProductViewModel(entry.Product);
Update(entry);
}
private void AddOrUpdateEntry(Product product, Func <ShoppingCartEntry, ShoppingCartEntry> updateFunc)
{
int productIndex = _shoppingCartEntries.IndexOf((entry) => (entry.Product == product));
if (productIndex == -1)
{
// Create new entry.
ShoppingCartEntry entry = new ShoppingCartEntry()
{
Product = product,
Quantity = 0,
};
// Allow update.
entry = updateFunc(entry);
// Add to list.
_shoppingCartEntries.Add(entry);
// Raise changed event.
RaiseEntriesChangedEvent(ShoppingCartEntriesChangedType.EntryAdded, _shoppingCartEntries.Count - 1);
}
else
{
ShoppingCartEntry entry = _shoppingCartEntries[productIndex];
// Apply update
entry = updateFunc(entry);
_shoppingCartEntries[productIndex] = entry;
// Raise changed event.
RaiseEntriesChangedEvent(ShoppingCartEntriesChangedType.EntryUpdated, productIndex);
}
}
/// <summary>
/// Updates this view model with the latest information from the shopping cart entry.
/// </summary>
/// <param name="entry"></param>
public void Update(ShoppingCartEntry entry)
{
if (this.Product != entry.Product)
{
throw new Exception("Updating with wrong 'Product' entry.");
}
_quantityString = entry.Quantity.ToString();
RaisePropertyChanged(nameof(QuantityString));
}