// perform post intialization
protected override void OnInitialized()
{
base.OnInitialized();
ProductIdProperty.SetCascadingProperty(Enumerations.Product.Attributes.ProductSubcategoryId, SubcategoryProperty);
ProductIdProperty.CascadingMatchNulls = true; // blank subcategory will display products with no categories
SpecialOfferIdProperty.LocalCacheLoader = new SpecialOfferProductReadListCacheLoader(ServiceProvider);
SpecialOfferIdProperty.SetCacheLoaderParameters(Enumerations.SpecialOfferProduct.Parameters.ProductId, ProductIdProperty);
// computed property using the entire object
Expression <Func <SalesOrderDetailObject, object> > xPrice = sod =>
sod.ProductIdProperty.IsNull(null) ? null : sod.ProductIdProperty.Value[Enumerations.Product.Attributes.ListPrice];
UnitPriceProperty.SetComputedValue(xPrice, this);
// computed property using individual property
Expression <Func <EnumProperty, object> > xDiscount = spOf =>
spOf.IsNull(null) ? null : spOf.Value[Enumerations.SpecialOfferProduct.Attributes.Discount];
UnitPriceDiscountProperty.SetComputedValue(xDiscount, SpecialOfferIdProperty);
// computed visible attribute based on discount value
Expression <Func <PercentFractionProperty, bool> > xDiscountVisible = dp => !dp.IsNull(null) && dp.Value > 0;
UnitPriceDiscountProperty.SetComputedVisible(xDiscountVisible, UnitPriceDiscountProperty);
// computed total using a helper function
Expression <Func <SalesOrderDetailObject, decimal> > xLineTotal = sod =>
GetLineTotal(sod.UnitPriceProperty.Value, sod.UnitPriceDiscountProperty.Value, sod.OrderQtyProperty.Value);
LineTotalProperty.SetComputedValue(xLineTotal, this);
}
private void UpdateLineTotal(object sender, PropertyChangeEventArgs e)
{
if (e.Change.IncludesValue())
{
LineTotalProperty.SetValue(GetLineTotal(UnitPriceProperty.Value,
UnitPriceDiscountProperty.Value, OrderQtyProperty.Value));
}
}
// perform post intialization
protected override void OnInitialized()
{
base.OnInitialized();
ProductIdProperty.Editable = true;
ProductIdProperty.IsKey = true;
OrderQtyProperty.Editable = true;
CarrierTrackingNumberProperty.Editable = true;
SpecialOfferIdProperty.Editable = true;
SpecialOfferIdProperty.LocalCacheLoader = new SpecialOfferProductReadListCacheLoader(ServiceProvider);
SpecialOfferIdProperty.SetCacheLoaderParameters(Enumerations.SpecialOfferProduct.Parameters.ProductId, ProductIdProperty);
Expression <Func <EnumIntProperty, DataRow, object> > xPrice = (prod, row) =>
prod.IsNull(row) ? null : prod.GetValue(row)[Enumerations.Product.Attributes.ListPrice];
UnitPriceProperty.SetComputedValue(xPrice, ProductIdProperty);
Expression <Func <EnumProperty, DataRow, object> > xDiscount = (spOf, row) =>
spOf.IsNull(row) ? null : spOf.GetValue(row)[Enumerations.SpecialOfferProduct.Attributes.Discount];
UnitPriceDiscountProperty.SetComputedValue(xDiscount, SpecialOfferIdProperty);
Expression <Func <MoneyProperty, PercentFractionProperty, SmallIntegerProperty, DataRow, decimal> > xLineTotal =
(price, discount, qty, row) => GetLineTotal(price.GetValue(row), discount.GetValue(row), qty.GetValue(row));
LineTotalProperty.SetComputedValue(xLineTotal, UnitPriceProperty, UnitPriceDiscountProperty, OrderQtyProperty);
// defer setting up NewAction enabling conditions until the parent is set, which it depends upon
PropertyChanged += (s, e) =>
{
if (e.PropertyName == nameof(Parent) && Parent != null)
{
Expression <Func <DataObject, bool> > xNewEnabled = obj => !obj.IsNew && obj.Editable;
NewAction.SetComputedEnabled(xNewEnabled, Parent);
}
};
}
