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Inhertied an event

Posted on 2000-04-08
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Last Modified: 2010-04-04
Hi

I have made a component with TStringGrid as anchestor. In my component I want to get an event to the OnSelectCell event, but I can't override it, because there is another function called SelectCell in TStringGrid. What is the trick here.
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Question by:koger
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7 Comments
 
LVL 9

Expert Comment

by:ITugay
ID: 2695920
TYourGrid = class(TStringGrid)
.......
function SelectCell(ACol, ARow: Longint): Boolean; override;
......
end;

function TYourGrid.SelectCell(ACol, ARow: Longint): Boolean;
begin
    // do what you need here  
    //.......
    innerited;
end;


-----
Igor
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LVL 9

Expert Comment

by:ITugay
ID: 2695922
sorry typo...
.....

    //.......
    inherited;
end;
----
Igor.
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Author Comment

by:koger
ID: 2695948
No I wanted to override the event not the function, sorry
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LVL 9

Expert Comment

by:ITugay
ID: 2695962
Then override it. Just declare it in published part and write your own methods to write and read its handleaddress.

property OnSelectCell : TYourEvent read YourGetProc write  YourSetProc;

-----
Igor.
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Author Comment

by:koger
ID: 2696032
Then I wouldn't give me any event in the derived class
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LVL 9

Accepted Solution

by:
ITugay earned 200 total points
ID: 2696069
Of course, you need to do it manually, for example by overriding method in ancestor:

function TYourGrid.SelectCell(ACol, ARow: Longint): Boolean;
begin
   if Assigned(OnSelectCell)
     then OnSelectCell(YourParameters);
   result:=innerited(aCol,aRow);
end;

-----
Igor.
0
 

Author Comment

by:koger
ID: 2696101
:-)
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