[Lazarus] Hook TComponent streaming system

[Mattias Gaertner]

On Sun, 23 May 2010 22:49:42 -0300
Luiz Americo Pereira Camara <luizmed at oi.com.br> wrote:

> Michael Van Canneyt escreveu:
> > On Sat, 22 May 2010, Luiz Americo Pereira Camara wrote:
> >> Mattias Gaertner escreveu:
> >>> What do you want to achieve? Why do you think you have to set a 
> >>> property after loading and before
> >>> Loaded?
> >>
> >> Just for convenience.
> >>
> >> Currently i'm sending a custom message to notify the form that all 
> >> properties (stored in lfm plus customized) are initialized so it can 
> >> take the necessary actions:
> >>
> >> Form.Perform(CM_INIT, 0, 0);
> >>
> >> If i find such event/procedure i could get rid of the message 
> >> sending/receiving.
> >>
> >> Not a big issue. I still can use OnShow, CreateWnd but it would not 
> >> be as intuitive as using Loaded.
> >
> > What is wrong with overriding Loaded ? It is the last thing that is 
> > called ?
> 
> In fact i'd like to use an overrided Loaded in the created TForm. But it 
> occurs to early:
> 
> Form := TMyForm.Create;
>       [..]//Streaming system
>       TMyForm.Loaded; //> occurs before the customized properties are set
> MySetPropertiesFunction(Form);//Set the desired properties. Too late to 
> be recognized by TMyForm.Loaded
> 
> I would need :
> 
> Form := TMyForm.Create;
>       [..]//Streaming system
>       //hook streaming to call MySetPropertiesFunction(Form);//Set the 
> desired properties.
>       TMyForm.Loaded; //> i can assume that all properties are set
> 
> By looking the TComponent/TReader code i could not figure how to do 
> that, so if i did not missed something it seems is not possible.

Why does the following not work for you?

procedure TMyForm.Loaded; override;
...
procedure TMyForm.Loaded; 
begin
  MySetPropertiesFunction(Self);
  inherited Loaded;
end;


Mattias