Problem with controller class

[Pan Niko]

Hello,

I trying to implement a program that is based on MVC model. Is my first time and I'll like some help. I have few classes that contains JButtons, JLabels, etc. those are my View. Also, I have a class that implements ActionListener and MouseListener and my View classes extends this Controller class. So, my obstacle is how I will connect each button or label in every class to this Controller class, so when button pressed to do something? Need a small sample code please.


Thank you
Pan_Niko

[dennis deems]

Extremely basic but I hope it gives you the idea:

class ViewImpl implements View
{
    // make a method like this for every control on the view
    // for example, if my view has a control named
    // "nameText", I would have a method named
    // "addNameTextListener"
    public void addXXXListener(ActionListener listener)
    {
        xxx.addActionListener(listener);
    }
}

class ModelImpl implements Model
{
    // update the model or perhaps perform some logic
    public void setXXXX(String xxxx)
    {
        ...
    }
}



class Controller
{
    // give the controller interfaces instead of implementations
    private View view; 
    private Model model;
    // I will typically open my listeners to package view for testing
    ActionListener xxxListener;
    
    public Controller(View view, Model model)
    {
        this.view=view;
        this.model=model;
        
        // for each control on the view, do something like this:
        xxxListener = new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                // update the model or whatever else needs to happen
                // this may not literally be the code to call, I'm working from memory
                // check the API
                String xxxx = e.getSource().getValue();
                model.setXXX(xxxx);
            }
        };
        view.addXXXListener(xxxListener);
        
    }
}

[Pan Niko]

Thank you so much about the code, helps a lot. Need to have

xxxListener = new ActionListener(){}

for each button I have in my program, or is multi-usable with this way? Also, if I have an empty JTextField in the ViewImpl and a button, and want when button pressed the JTextField filled with "Hello", how I will do this using MVC?

thank you

** Didn't notice this before, sorry

// for each control on the view, do something like this:

What is contained in those classes View and Model where you implement these classes?

[dennis deems]

Pan Niko wrote:What is contained in those classes View and Model where you implement these classes?

They are interfaces. They might look something like this:

public interface View
{
    /**
     * adds a listener to be notified whenever the XXX button is selected
     */
    public void addXXXListener(ActionListener listener);

    // etc.
}

public interface Model
{
    /**
     * sets the value of the XXX property
     */
    public void setXXX(String xxx);

    // etc.
}

[Pan Niko]

Hello,

Finally, decided to have one controller per each view class I have, and also, implements my view classes to Observer and my model class to Observable. By using interfaces with the way I'm working, is still helpful?