/// <summary>
/// Registers the inverse change (READY TO BE UNDONE) of a supplied controlled collection and its owning instance, to be undone/redone in the future.
/// This must happen as part of a grouping combined variation (a command being performed).
/// Also, it will not be performed if already an undo/redo operation is running.
/// </summary>
public static void RegisterInverseCollectionChange(IModelEntity Instance, EditableCollection SourceCollection, char AlterCode, params object[] Parameters)
{
if (Instance == null || Instance.EditEngine == null ||
Instance.EditEngine.ExecutionStatus != EExecutionStatus.Running)
{
return;
}
// If no engine controlling or not within command variation declaration then abandon.
if (!Instance.EditEngine.IsVariating)
{
//T Console.WriteLine("No variating at collection change.");
return;
}
// IMPORTANT: EDIT-ENGINES MUST MATCH FOR CHANGING VALUES.
if (Instance.EditEngine != ActiveEntityEditor)
{
throw new UsageAnomaly("Active Entity-Editor differs (for collection) from that of the changing Entity '" + Instance.ToStringAlways() + "'.");
}
// Stores the variation into the command being declared.
var MemberDef = SourceCollection.VariatingInstance.ClassDefinition.GetMemberDef(SourceCollection.Name, false);
Instance.EditEngine.StoreVariation(new CollectionVariation(SourceCollection, AlterCode, Parameters),
(MemberDef != null && MemberDef.ChangesExistenceStatus));
}
// ---------------------------------------------------------------------------------------------------------------------------------------------------------------
/// <summary>
/// Registers the inverse assignment (READY TO BE UNDONE) of a supplied controlled property and its owning instance, to be undone/redone in the future.
/// This must happen as part of a grouping combined variation (a command being performed).
/// Also, it will not be performed if already an undo/redo operation is running.
/// </summary>
internal static void RegisterInverseAssignment(MModelPropertyDefinitor SourcePropertyDef, IModelEntity Instance, object Value)
{
// If no engine controlling or not within command variation declaration then abandon.
if (Instance.EditEngine == null || Instance.EditEngine.ExecutionStatus != EExecutionStatus.Running)
{
return;
}
if (!Instance.EditEngine.IsVariating)
{
//T Console.WriteLine("No variating at property change.");
return;
}
// IMPORTANT: EDIT-ENGINES MUST MATCH FOR CHANGING VALUES.
if (Instance.EditEngine != ActiveEntityEditor)
{
throw new UsageAnomaly("Active Entity-Editor differs (for assignment) from that of the changing Entity '" + Instance.ToStringAlways() + "'.");
}
// Stores the variation into the command being declared.
Instance.EditEngine.StoreVariation(new AssignmentVariation(SourcePropertyDef, Instance, Value), SourcePropertyDef.ChangesExistenceStatus);
}
