Using delphi 7, I have a TCollection/TCollectionItem set of descendents. They are intended to be set up in Design-time only, and should never be modified in Run-time. How can I do this? Design-time should always allow whatever edits are needed, but in Run-time, I don't want to be able to Add, Remove, or Re-index any of the items in the collection. The properties of each of those items, yes, I do want them to be enabled. But changing the actual items around shall only be in design-time.
Delphi TCollection - Possible to prevent changing items in run-time?
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You can override the
Assign()andNotify()methods ofTCollectionto be notified of adds and deletes, and override theSetIndex()method ofTCollectionItemto be notified of reindexings. For adds/deletes, throw an exception to reject the operation (in the case of add, you will have to free the new item that was added). For reindexing, just exit without doing anything.To differentiate between run-time and design-time, walk through the Owner chain of
TCollection(in case it is nested inside of other classes) until you find aTComponent, then you can check itsComponentStateproperty for thecsDesigningflag.