/// <summary>
/// Deletes a <see cref="BinaryRelationship" /> for the selected pair of thing
/// </summary>
/// <param name="direction">The direction of the relationship to delete</param>
/// <returns>The task</returns>
private Task DeleteRelationship(RelationshipDirectionKind direction)
{
if (!(this.SelectedCell is MatrixCellViewModel vm))
{
return(Task.FromResult(0));
}
var iterationClone = this.iteration.Clone(false);
var context = TransactionContextResolver.ResolveContext(iterationClone);
var transaction = new ThingTransaction(context, iterationClone);
foreach (var binaryRelationship in vm.Relationships)
{
var clone = binaryRelationship.Clone(false);
if (vm.RelationshipDirection != RelationshipDirectionKind.BiDirectional ||
direction == RelationshipDirectionKind.BiDirectional)
{
// delete every relationship
transaction.Delete(clone);
}
else if (direction == RelationshipDirectionKind.RowThingToColumnThing &&
vm.SourceY.Iid == binaryRelationship.Source.Iid)
{
transaction.Delete(clone);
}
else if (direction == RelationshipDirectionKind.ColumnThingToRowThing &&
vm.SourceX.Iid == binaryRelationship.Source.Iid)
{
transaction.Delete(clone);
}
}
return(this.session.Write(transaction.FinalizeTransaction()));
}
/// <summary>
/// Creates a <see cref="BinaryRelationship" /> for the selected cell
/// </summary>
/// <param name="direction">The direction fo the relationship to create</param>
/// <returns>The task</returns>
private Task CreateRelationship(RelationshipDirectionKind direction)
{
var vm = this.SelectedCell as MatrixCellViewModel;
if (vm == null)
{
return(Task.FromResult(0));
}
var relationship = new BinaryRelationship(Guid.NewGuid(), null, null)
{
Owner = this.session.OpenIterations[this.iteration].Item1
};
relationship.Category.Add(vm.Rule.RelationshipCategory);
relationship.Source =
direction == RelationshipDirectionKind.RowThingToColumnThing ? vm.SourceY : vm.SourceX;
relationship.Target =
direction == RelationshipDirectionKind.RowThingToColumnThing ? vm.SourceX : vm.SourceY;
var iterationClone = this.iteration.Clone(false);
iterationClone.Relationship.Add(relationship);
var context = TransactionContextResolver.ResolveContext(relationship);
var transaction = new ThingTransaction(context, iterationClone);
transaction.Create(relationship, iterationClone);
return(this.session.Write(transaction.FinalizeTransaction()));
}