/// <summary>
/// Create a connection between an ExternalConstraintShape and a FactType. Roles
/// used in the connection are stored with the currently active connect action.
/// </summary>
/// <param name="sourceShapeElement">The source of the requested connection</param>
/// <param name="targetShapeElement">The target of the requested connection</param>
/// <param name="paintFeedbackArgs">PaintFeedbackArgs</param>
public override void CreateConnection(ShapeElement sourceShapeElement, ShapeElement targetShapeElement, PaintFeedbackArgs paintFeedbackArgs)
{
SubtypeConnectAction action = (sourceShapeElement.Diagram as ORMDiagram).SubtypeConnectAction;
ObjectType sourceObjectType;
ObjectType targetObjectType;
if ((null != (sourceObjectType = action.mySourceObjectType)) &&
(null != (targetObjectType = ObjectTypeFromShape(targetShapeElement))))
{
SubtypeFact.Create(sourceObjectType, targetObjectType);
}
}
/// <summary>
/// Called as the pointer is moved over potential targets after a source is selected
/// So should be pretty quick
/// </summary>
/// <remarks>
/// The cursor can change dependant on CanCreateConnection when this returns true
/// </remarks>
/// <param name="sourceShapeElement">ShapeElement</param>
/// <param name="targetShapeElement">ShapeElement</param>
/// <returns></returns>
public override bool IsValidSourceAndTarget(ShapeElement sourceShapeElement, ShapeElement targetShapeElement)
{
SubtypeConnectAction action = (sourceShapeElement.Diagram as ORMDiagram).SubtypeConnectAction;
ObjectType sourceObjectType;
ObjectType targetObjectType;
if ((null != (sourceObjectType = action.mySourceObjectType)) &&
(null != (targetObjectType = ObjectTypeFromShape(targetShapeElement))))
{
// UNDONE: Be smarter here, or display message later on
return(sourceObjectType != targetObjectType && ((sourceObjectType.DataType == null) == (targetObjectType.DataType == null)));
}
return(false);
}
