/// <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)
{
ORMDiagram diagram = (ORMDiagram)sourceShapeElement.Diagram;
RoleConnectAction action = diagram.RoleConnectAction;
ObjectType objectType;
RoleBase sourceRole = action.mySourceRole;
RoleBase roleBase;
RoleBase targetRole;
FactTypeShape factTypeShape;
if (sourceRole != null &&
sourceShapeElement == targetShapeElement &&
null != (targetRole = action.myLastMouseMoveRole) &&
targetRole != sourceRole &&
null != (factTypeShape = sourceShapeElement as FactTypeShape))
{
LinkedElementCollection <RoleBase> displayedRoles = factTypeShape.GetEditableDisplayRoleOrder();
displayedRoles.Move(displayedRoles.IndexOf(sourceRole), displayedRoles.IndexOf(targetRole));
}
else if ((null != (roleBase = sourceRole) && null != (objectType = ObjectTypeFromShape(targetShapeElement))) ||
(null != (objectType = action.mySourceObjectType) && null != (roleBase = action.myLastMouseMoveRole)))
{
// Don't trigger a change if none is indicated. Turn this into a noop
Role role = roleBase.Role;
if (role.RolePlayer != objectType)
{
role.RolePlayer = objectType;
}
}
else if (targetShapeElement == diagram &&
action.mySourceRoleMissingConnector)
{
diagram.PlaceORMElementOnDiagram(null, roleBase.Role.RolePlayer, paintFeedbackArgs.TargetFeedbackBounds.Location, ORMPlacementOption.AllowMultipleShapes, null, null);
}
}
/// <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)
{
ORMDiagram diagram = (ORMDiagram)sourceShapeElement.Diagram;
RoleConnectAction action = diagram.RoleConnectAction;
action.myRoleReorderConnector = false;
ObjectType objectType;
RoleBase sourceRole = action.mySourceRole;
RoleBase role;
RoleBase targetRole;
Objectification objectification;
// Reorder roles in the same shape
if (sourceRole != null &&
sourceShapeElement == targetShapeElement &&
null != (targetRole = action.myLastMouseMoveRole) &&
targetRole != sourceRole)
{
action.myRoleReorderConnector = true;
return(true);
}
else if ((null != (role = sourceRole) && null != (objectType = ObjectTypeFromShape(targetShapeElement)) &&
(null == (objectification = objectType.Objectification) || !objectification.IsImplied)) ||
(null != (objectType = action.mySourceObjectType) && null != (role = action.myLastMouseMoveRole)))
{
return(role.Role.FactType != objectType.NestedFactType);
}
// Allow the user to drag out an existing role player from a
// role on a shape that is not connected.
else if (targetShapeElement == diagram &&
action.mySourceRoleMissingConnector)
{
return(true);
}
return(false);
}