Re: how to delete a JList element
On Sun, 22 Jun 2008 13:14:00 +0000, Roedy Green wrote:
DefaultListModel does have a remove operation.
A tidy solution might be to extend DefaultListModel to do the whole job
of managing that data, add some generics, then you can avoid copying
back and forth.
It kinda works by extending DefaultListModel:
thufir@arrakis:~/bcit-comp2611-project2$
thufir@arrakis:~/bcit-comp2611-project2$ cat src/a00720398/data/
GuestsModel.java
package a00720398.data;
import javax.swing.*;
import a00720398.util.*;
@SuppressWarnings({"unchecked", "serial"})
public class GuestsModel extends DefaultListModel{
private static final GuestsModel INSTANCE = new GuestsModel();
private GuestsModel() {
java.util.List<Guest> guests = FileUtil.readGuests();
System.out.println("guests \n" + guests.toString());
for (Guest guest : guests) {
addElement(guest);
}
//addAll(0,guests);
}
public static GuestsModel getInstance() {
return INSTANCE;
}
}
thufir@arrakis:~/bcit-comp2611-project2$
and then in the view:
private void deleteGuestActionPerformed(java.awt.event.ActionEvent
evt)
{
int i = guestsView.getSelectedIndex();
GuestsModel.getInstance().remove(i);
guestsView.setModel(GuestsModel.getInstance()); //controller?
}
However, I'm always having to call guestView.setModel(), and I seem to be
missing a controller as per:
Controller
Processes and responds to events, typically user actions, and may
invoke changes on the model.
http://en.wikipedia.org/wiki/Model_view_controller
I have a seperate class, GuestsController, but what would it do here? I
only see one line of deleteGuestActionPerformed to put in a controller,
albeit that line is scattered throughout the view.
Maybe I could somehow put that entire method into a separate class? I
could maybe do that with an inner class.
-Thufir