/// <summary>
/// Adds a book to the shopping cart.
/// </summary>
/// <param name="book"></param>
/// <param name="example"></param>
public void AddItem(NBook book, NWidgetHostingExample example)
{
// try find an item with the same name. if such exists -> incerase quantity and rebuild shopping cart widget
for (int i = 0; i < Items.Count; i++)
{
if (Items[i].Name == book.Name)
{
Items[i].Quantity++;
example.m_ShoppingCartWidget.Content = CreateWidget(example);
return;
}
}
// add new item and rebuild shopping cart widget
NShoppingCartItem item = new NShoppingCartItem();
item.Name = book.Name;
item.Price = book.Price;
item.Quantity = 1;
Items.Add(item);
example.m_ShoppingCartWidget.Content = CreateWidget(example);
}
/// <summary>
/// Creates the widget that represents the current state of the shopping cart.
/// </summary>
/// <param name="example"></param>
/// <returns></returns>
public NWidget CreateWidget(NWidgetHostingExample example)
{
if (Items.Count == 0)
{
return(new NLabel("The Shopping Cart is Empty"));
}
const double spacing = 10;
// create the grand total label
NLabel grandTotalLabel = new NLabel(GetGrandTotal().ToString("0.00"));
// items table
NTableFlowPanel tableFlowPanel = new NTableFlowPanel();
tableFlowPanel.HorizontalSpacing = spacing;
tableFlowPanel.VerticalSpacing = spacing;
tableFlowPanel.MaxOrdinal = 5;
// add headers
tableFlowPanel.Add(new NLabel("Name"));
tableFlowPanel.Add(new NLabel("Quantity"));
tableFlowPanel.Add(new NLabel("Price"));
tableFlowPanel.Add(new NLabel("Total"));
tableFlowPanel.Add(new NLabel());
for (int i = 0; i < Items.Count; i++)
{
NShoppingCartItem item = Items[i];
// name
NLabel nameLabel = new NLabel(item.Name);
NLabel priceLabel = new NLabel(item.Price.ToString("0.00"));
NLabel totalLabel = new NLabel(item.GetTotal().ToString("0.00"));
// quantity
NNumericUpDown quantityNud = new NNumericUpDown();
quantityNud.Value = item.Quantity;
quantityNud.DecimalPlaces = 0;
quantityNud.Minimum = 0;
quantityNud.ValueChanged += delegate(NValueChangeEventArgs args) {
item.Quantity = (int)((NNumericUpDown)args.TargetNode).Value;
totalLabel.Text = item.GetTotal().ToString("0.00");
grandTotalLabel.Text = GetGrandTotal().ToString("0.00");
};
NButton deleteButton = new NButton("Delete");
deleteButton.Click += delegate(NEventArgs args){
DeleteItem(item, example);
};
tableFlowPanel.Add(nameLabel);
tableFlowPanel.Add(quantityNud);
tableFlowPanel.Add(priceLabel);
tableFlowPanel.Add(totalLabel);
tableFlowPanel.Add(deleteButton);
}
// add grand total
tableFlowPanel.Add(new NLabel("Grand Total"));
tableFlowPanel.Add(new NLabel());
tableFlowPanel.Add(new NLabel());
tableFlowPanel.Add(grandTotalLabel);
tableFlowPanel.Add(new NLabel());
return(tableFlowPanel);
}
public void DeleteItem(NShoppingCartItem item, NWidgetHostingExample example)
{
// remove the item and rebuild the shopping cart
Items.Remove(item);
example.m_ShoppingCartWidget.Content = CreateWidget(example);
}