Question

I am looking into the MVC from a Command line point of view (not web and no framework).. nice and simple. the only thing that confuses me is the View part of this? (well it may not be the only but its the main one)

from the IBM site the view has the following definition

The view provides the
presentation of the model. It is the
look of the application. The view can
access the model getters, but it has
no knowledge of the setters. In
addition, it knows nothing about the
controller. The view should be
notified when changes to the model
occur.

So if i have the following:

Model

• Person

View

• EditPersonDetails

Controller

• PersonController

My person controller could pass a person object to the EditPeronDetails view, however how does my view edit the person if it cannot access its setters, how can i edit the person?

Also does the view class only do one thing? ie can I have a Person View, which has methods for Create, View, Delete, edit the person

many thanks

bones

Answer 1

Is it really necessary to apply a 3 letter acronym here? if you must:

1. user sees the console screen, which shows the view (lines of texts)
2. user types something on command line, which is an even from view
3. controller gets the event, i.e. the user input
4. controller does something accordingly, and updates the model (persons)
5. controller tells the view to repaint, i.e. print some more lines.

psuedocode:

Person // model
   update();

View
   modelUpdated()
       println(Person.name); ...

Controller
     main()
         while( input = getInput() )
             person.update(...);
             view.modelUpdated();