[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] Reference for unit 'Classes' (#rtl)

TCollection.Update

Hander called when an item in the collection has changed.

Declaration

Source position: classesh.inc line 490

protected procedure TCollection.Update(

  Item: TCollectionItem

); virtual;

Description

Update is called in the following cases:

  1. An item is added to or removed from the collection.
  2. An item is moved in the list, i.e. its TCollectionItem.Index property changes.
  3. An item's TCollectionItem.DisplayName property changes.

Descendent classes can override this method to perform additional actions when the collection changes. The Item parameter indicates the item that was changed. This can be Nil

See also

TCollection.Changed

  

Procedure called if an item is added to or removed from the collection.
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