/// <summary>
/// Returns a collection of standard values for the data type this type converter is designed for when provided
/// with a format context.
/// </summary>
/// <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>
/// <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>
public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
{
AssociationConnector connector = context.Instance as AssociationConnector;
if (connector == null)
{
return(new StandardValuesCollection(new string[0]));
}
Association association = PresentationViewsSubject.GetSubject(connector) as Association;
if (association == null)
{
return(new StandardValuesCollection(new string[0]));
}
List <string> result = new List <string>
{
$"* (Collection of {association.Source.Name})",
//$"1..* (Collection of one or more {association.Source.Name})",
$"0..1 (Zero or one of {association.Source.Name})",
$"1 (One {association.Source.Name})"
};
return(new StandardValuesCollection(result));
}
/// <summary>Converts the given value object to the specified type, using the specified context and culture information.</summary>
/// <returns>An <see cref="T:System.Object" /> that represents the converted value.</returns>
/// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext" /> that provides a format context. </param>
/// <param name="culture">
/// A <see cref="T:System.Globalization.CultureInfo" />. If null is passed, the current culture is
/// assumed.
/// </param>
/// <param name="value">The <see cref="T:System.Object" /> to convert. </param>
/// <param name="destinationType">The <see cref="T:System.Type" /> to convert the <paramref name="value" /> parameter to. </param>
/// <exception cref="T:System.ArgumentNullException">The <paramref name="destinationType" /> parameter is null. </exception>
/// <exception cref="T:System.NotSupportedException">The conversion cannot be performed. </exception>
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
AssociationConnector connector = context?.Instance as AssociationConnector;
if (connector != null)
{
Association association = PresentationViewsSubject.GetSubject(connector) as Association;
if (destinationType == typeof(string) && association != null && value is Multiplicity)
{
switch ((Multiplicity)value)
{
case Multiplicity.One:
return($"1 (One {association.Source.Name})");
//case Multiplicity.OneMany:
// return $"1..* (Collection of one or more {association.Source.Name})";
case Multiplicity.ZeroMany:
return($"* (Collection of {association.Source.Name})");
case Multiplicity.ZeroOne:
return($"0..1 (Zero or one of {association.Source.Name})");
}
}
}
return(base.ConvertTo(context, culture, value, destinationType));
}
public static void UpdateAssociationDisplay(AssociationConnector connector
, DeleteAction?sourceDeleteAction = null
, DeleteAction?targetDeleteAction = null)
{
if (!(connector?.ModelElement is Association element))
{
return;
}
ModelRoot modelRoot = element.Store.ElementDirectory.FindElements <ModelRoot>().FirstOrDefault();
GetEffectiveDeleteAction(element, out DeleteAction? calculatedSourceDeleteAction, out DeleteAction? calculatedTargetDeleteAction);
sourceDeleteAction = sourceDeleteAction != null && sourceDeleteAction != DeleteAction.Default
? sourceDeleteAction
: calculatedSourceDeleteAction;
targetDeleteAction = targetDeleteAction != null && targetDeleteAction != DeleteAction.Default
? targetDeleteAction
: calculatedTargetDeleteAction;
bool persistent = element.Persistent;
bool cascade = modelRoot.ShowCascadeDeletes &&
persistent &&
(targetDeleteAction == DeleteAction.Cascade ||
sourceDeleteAction == DeleteAction.Cascade);
Color black = Color.FromArgb(255, 113, 111, 110);
Color lineColor = !persistent
? Color.SlateGray
: cascade
? Color.Red
: black;
DashStyle lineStyle = cascade
? DashStyle.Dash
: DashStyle.Solid;
using (Transaction trans = element.Store.TransactionManager.BeginTransaction("Display associations"))
{
SetConnectorWidth(connector);
if (connector.Color != lineColor)
{
connector.Color = lineColor;
element.InvalidateDiagrams();
}
if (connector.DashStyle != lineStyle)
{
connector.DashStyle = lineStyle;
element.InvalidateDiagrams();
}
trans.Commit();
}
}
private static void SetConnectorWidth(AssociationConnector connector)
{
PenSettings settings = connector.StyleSet.GetOverriddenPenSettings(DiagramPens.ConnectionLine) ?? new PenSettings();
settings.Width = connector.ManuallyRouted
? 0.02f
: 0.01f;
connector.StyleSet.OverridePen(DiagramPens.ConnectionLine, settings);
}