Re: [boost] [gui] Shoulders of Giants

From: Alan Gutierrez (alan-boost_at_[hidden])
Date: 2004-12-26 11:40:22

* Manfred Doudar <manfred.doudar_at_[hidden]> [2004-12-23 10:03]:
> Alan Gutierrez wrote:
> 
> >* Dave Harris <brangdon_at_[hidden]> [2004-12-23 07:14]:
> > 
> >
> >>In-Reply-To: <20041222211651.GD2616_at_[hidden]>
> >>alan-boost_at_[hidden] (Alan Gutierrez) wrote (abridged):
> >>   
> >>
> >>>   I'd like to take some time and study what has gone before.
> >>>[...]
> >>>   I've advocated the use of a CSS layout component to render
> >>>   the View-Controller aspect [...]
> >>>     
> >>>
> >>Are you aware of the variations on MVC, in particular 
> >>Model-View-Presenter? MVP has been so successful in Smalltalk that I 
> >>consider MVC obsolete. Taligent's whitepaper is here:
> >>   
> >>
> >
> > 
> >
> >> http://www.carfield.com.hk/document/software_design/MVP.pdf
> >>   
> >>
> >
> >   This is password protected. Somewhere else perhaps?
> >
> > 
> >
> 
> You can get this document here:
> 
> http://web.archive.org/web/20010827084558/www-106.ibm.com/developerworks/library/mvp.html
> 
> Note however, the only difference between this and the original is
> that they've simply replaced most occurances of  "C++" with the
> word "Java"  - now that's heretical revisionism if ever I saw it !

    Synopsis:

    Start with a description of Model-View-Controler.

    Model Questions:

        Model, Selections, Commands.

        What is my data?
        What can I do to my data?
        How dow I select my data?

    View Questions:

        View, Interactor, Presenter.

        How do I display my data?
        How events map into changes in my data?
        How do I put it all together?  

    A model is say, check register.
    A selection is say, the category field of a specific check. 
    A command is would be to the the category to "Utilties".

    A view is say, a row in a table display of the check register.
    A interactor is a drop down control in that checks row.

    What is the presenter?
    
    It seems that the command is used so (and I'm just learning C++):

    class mvp::command
    {
        public:
            command(mvp::selection & selected): selected(selected) { }
            command(mvp::command & command): selected(selected.command) { }

            void do_it(mvp:model & model);

            void undo_it(mvp::model & model);

        private:
            mvp::selection& selected;
    };

    It seems like the interactor could be a generic that constructs
    the correct command, so the presenter is that a factory for a
    Java implementation.
    
    template <class Command>
    class mvp::interactor
    {
        public:
            Command on_select_change(std::string & string);
    };

--
Alan Gutierrez - alan_at_[hidden]