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TCollection.Changed Method
TCollection Class | TCollection Members | Classes Namespace | Description | See Also
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Responds when the collection or any of its items changes.

Pascal
procedure Changed;
C++
__fastcall Changed();
Description

Changed is called automatically when items in the collection change or when the EndUpdate method signals that an update is complete. It checks the value of UpdateCount, and if it is 0, calls the Update method, which performs any necessary updates. 

When writing a TCollection descendant, there is no need to call Changed. Instead, bracket any changes by calls to BeginUpdate and EndUpdate. 

 

See Also
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