public void Buy(object sender, EventArgs e)
{
var found = items.FirstOrDefault(x => x.Name.Equals(Item.Text));
int i = items.IndexOf(found);
if (i != -1)
{
if (isQuantityValid())
{
DisplayAlert("Error", "Please, enter quantity above zero.", "OK"); return;
}
int quantity = Int32.Parse(Quantity.Text);
//Check if the quantity available is in stock
if (items[i].Quantity >= quantity)
{
//Update the observable collection
Item nwitm = new Item(items[i].Name, items[i].Price, items[i].Quantity - quantity);
items[i] = nwitm;
//Log the purchase (works)
HistoryItem hi = new HistoryItem(DateTime.Now, items[i].Name, quantity, Double.Parse(Total.Text));
App.Database.SaveItemAsync(hi);//suspicious
//Reset the text fields
Clear(sender, e);
}
else
{
//Item.Text = "Incorrect quantity, try again.";
DisplayAlert("Error", "Requested Quantity not available.", "OK");
}
}
else
{
DisplayAlert("Error", "Please, select an item you want to buy.", "OK");
}
}
async void OnListViewItemSelected(object sender, SelectedItemChangedEventArgs e)
{
HistoryItem selectedItem = e.SelectedItem as HistoryItem;
await Navigation.PushAsync(new HistoryDetailPage(selectedItem.ID));
}
public Task <int> DeleteItemAsync(HistoryItem item)
{
return(Database.DeleteAsync(item));
}
async void OnListViewItemTapped(object sender, ItemTappedEventArgs e)
{
HistoryItem tappedItem = e.Item as HistoryItem;
await Navigation.PushAsync(new HistoryDetailPage(tappedItem.ID));
}