/// <summary>
/// Setup the shopping cart feature
/// </summary>
public static void Create(CustomPivotViewer pivotViewer)
{
// Don't need to save a reference to the object created here, because the
// ShoppingCart will be referenced by the PivotViewer to which it is
// attached
new ShoppingCart(pivotViewer);
}
/// <summary>
/// Construct an instance of ShoppingCart
/// </summary>
private ShoppingCart(CustomPivotViewer pivotViewer)
{
if (pivotViewer.GetCustomActionsForItemCallback != null)
{
throw new InvalidOperationException(
"Shopping cart must be the only handler for a CustomPivotViewer's GetCustomActionsForItemCallback");
}
// Redirect calls to our PivotViewer's GetCustomActionsForItem to our own method
pivotViewer.GetCustomActionsForItemCallback = this.GetCustomActionsForItem;
m_pivotViewer = pivotViewer;
// Hook the ItemActionExecuted event handler
m_pivotViewer.ItemActionExecuted += PivotViewer_ItemActionExecuted;
// Check for the CartContentsGrid element, and if it exists make it visible. Doing this
// dynamically allows the application to build & run if the element is removed
FrameworkElement cartContentsGrid = m_pivotViewer.FindName("CartContentsGrid") as FrameworkElement;
if (cartContentsGrid != null)
{
cartContentsGrid.Visibility = Visibility.Visible;
}
// Build the "Add to Cart" custom action
s_addCustomAction =
new CustomAction(
"Add to Cart",
GetIconUri("Add.png"),
"Adds the item to the cart",
AddItemActionId);
// Build the "Remove from Cart" custom action
s_removeCustomAction =
new CustomAction(
"Remove from Cart",
GetIconUri("Remove.png"),
"Removes the item from the cart",
RemoveItemActionId);
}
