/// <summary>
/// Returns the default property for this instance of a component.
/// </summary>
/// <returns>
/// A <see cref="T:System.ComponentModel.PropertyDescriptor"/> that represents the default property for this object, or null if this object does not have properties.
/// </returns>
PropertyDescriptor ICustomTypeDescriptor.GetDefaultProperty()
{
PropertySpecification propertySpec = this.PropertySpecifications.FirstOrDefault(p => p.Name == this.DefaultProperty);
return(propertySpec == null ? null : new PropertySpecificationDescriptor(propertySpec, this,
new Attribute[] { new MergablePropertyAttribute(true) }));
}
/// <summary>
/// Returns whether the collection of standard values returned from <see cref="M:System.ComponentModel.TypeConverter.GetStandardValues"/> is an exclusive list of possible values, using the specified context.
/// </summary>
/// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext"/> that provides a format context.</param>
/// <returns>
/// true if the <see cref="T:System.ComponentModel.TypeConverter.StandardValuesCollection"/> returned from <see cref="M:System.ComponentModel.TypeConverter.GetStandardValues"/> is an exhaustive list of possible values; false if other values are possible.
/// </returns>
public override bool GetStandardValuesExclusive(ITypeDescriptorContext context)
{
PropertySpecification specification = GetPropSpec(context);
if (specification == null)
{
Trap.trap();
return(true);
}
return(!specification.IsValueListPlus);
}
/// <summary>
/// Returns whether this object supports a standard set of values that can be picked from a list, using the specified context.
/// </summary>
/// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext"/> that provides a format context.</param>
/// <returns>
/// true if <see cref="M:System.ComponentModel.TypeConverter.GetStandardValues"/> should be called to find a common set of values the object supports; otherwise, false.
/// </returns>
public override bool GetStandardValuesSupported(ITypeDescriptorContext context)
{
PropertySpecification specification = GetPropSpec(context);
if (specification == null)
{
Trap.trap();
return(true);
}
return(specification.ValueList != null && specification.ValueList.Count > 0);
}
/// <summary>
/// Returns a collection of standard values for the data type this type converter is designed for when provided with a format context.
/// </summary>
/// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext"/> that provides a format context that can be used to extract additional information about the environment from which this converter is invoked. This parameter or properties of this parameter can be null.</param>
/// <returns>
/// A <see cref="T:System.ComponentModel.TypeConverter.StandardValuesCollection"/> that holds a standard set of valid values, or null if the data type does not support a standard set of values.
/// </returns>
public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
{
if ((context == null) || (context.PropertyDescriptor == null) || (context.PropertyDescriptor.ComponentType == null) ||
(context.PropertyDescriptor.ComponentType != typeof(PropertySpecification)))
{
Trap.trap();
return(base.GetStandardValues(context));
}
PropertySpecificationDescriptor specificationDescriptor = context.PropertyDescriptor as PropertySpecificationDescriptor;
if (specificationDescriptor == null)
{
// check if the property descriptor is a multi-property descriptor, which is created by various property grids when multiple objects are
// merged and displayed simultaneously.
var itemProperty = context.PropertyDescriptor.GetType().GetProperty("Item");
if (itemProperty == null)
{
return(base.GetStandardValues(context));
}
try
{
specificationDescriptor = itemProperty.GetValue(context.PropertyDescriptor, new object[] { 0 }) as PropertySpecificationDescriptor;
if (specificationDescriptor == null)
{
// give up
return(base.GetStandardValues(context));
}
}
catch
{
// no descriptor at index 0
return(base.GetStandardValues(context));
}
}
// check if the property descriptor is a multi-property descriptor, which is created by various property grids when multiple objects are
PropertySpecification specification = specificationDescriptor.Specification;
if ((specification == null) || (specification.ValueList == null) || (specification.ValueList.Count <= 0))
{
Trap.trap();
// check if the property descriptor is a multi-property descriptor, which is created by various property grids when multiple objects are
return(base.GetStandardValues(context));
}
// check if the property descriptor is a multi-property descriptor, which is created by various property grids when multiple objects are
return(new StandardValuesCollection(specification.ValueList));
}
/// <summary>
/// Initializes a new instance of the PropertySpecEventArgs class.
/// </summary>
/// <param name="property">The PropertySpec that represents the property whose value is being requested or set.</param>
/// <param name="val">The current value of the property.</param>
public PropertySpecificationEventArgs(PropertySpecification property, object val)
{
this.Property = property;
this.Value = val;
}
/// <summary>
/// Initializes a new instance of the <see cref="PropertySpecificationDescriptor"/> class.
/// </summary>
/// <param name="specification">The specification.</param>
/// <param name="containingBag">The containing bag.</param>
/// <param name="propertyAttributes">The property attributes.</param>
public PropertySpecificationDescriptor(PropertySpecification specification, PropertyBag containingBag, Attribute[] propertyAttributes) :
base(specification.Name, propertyAttributes)
{
ContainingBag = containingBag;
Specification = specification;
}
