Skip to content

    TList.FPONotifyObservers

    Notify observers of changes in the list.

    Declaration

    Source position: classesh.inc line 612

    public 
procedure TList.FPONotifyObservers(ASender: TObject; 
                                  AOperation: TFPObservedOperation; 
                                  Data: Pointer);

    Description

    FPONotifyObservers is called to notify observers of changes in the list. The following notifications are sent:

    ooAddItem
    when a pointer is added. Data is the pointer that is added.
    ooDeleteItem
    when a pointer is deleted or extracted. Data is the pointer that is deleted or extracted.
    ooChange
    called when 2 pointers are exchanged.
    ooFree
    Called when the list is freed.

    See also

    Name Description
    FPODetachObserver
    FPOAttachObserver
    Add
    Exchange
    Delete Delete elements (characters) from a string or dynamic array.
    Extract