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Duplicating components runtime

Posted on 2001-06-19
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Last Modified: 2010-04-06
Is there an easy way to duplicate any given component in your app at runtime?

One way is obviously to create a new one and set all the properties manually, but I'm looking for something more flexible.
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Question by:Keijo
  • 2
4 Comments
 
LVL 5

Expert Comment

by:TheNeil
ID: 6206099
What about using the Assign method?

The Neil =:)
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LVL 1

Accepted Solution

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alx512 earned 100 total points
ID: 6255574
Hi! This code work only for published properties.
Try it.

function CopyComponent(Component: TComponent; NewComponentName: String): TComponent;
var
  Stream: TMemoryStream;
  S: String;
begin
  Result := TComponentClass(Component.ClassType).Create(Component.Owner);
  S := Component.Name;
  Component.Name := NewComponentName;
  Stream := TMemoryStream.Create;
  try
    Stream.WriteComponent(Component);
    Component.Name := S;
    Stream.Seek(0, soFromBeginning);
    Stream.ReadComponent(Result);
  finally
    Stream.Free;
  end;
end;

procedure TForm1.CopyButtonClick(Sender: TObject);
var
  NumberEdit2: TNumberEdit;
begin
  NumberEdit2 := CopyComponent(NumberEdit1, 'NumberEdit2') as TNumberEdit;
  NumberEdit2.Top := NumberEdit2.Top + 50;
  InsertControl(NumberEdit2);
end;
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LVL 1

Expert Comment

by:alx512
ID: 6255580
Try TEdit or other standart VCL component
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Author Comment

by:Keijo
ID: 6259276
Thanks, that works like charm! (had to make some adjustments and publish everything though)
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