Coverage Summary for Class: CheckBoxListener (it.polimi.ingsw.Client.GUI.Listeners)

1 package it.polimi.ingsw.Client.GUI.Listeners;
2 
3 import javax.swing.*;
4 import java.awt.event.ItemEvent;
5 import java.awt.event.ItemListener;
6 
7 /**
8  * Listener responsible for restricting the maximum number of checkboxes that can be selected
9  */
10 public class CheckBoxListener implements ItemListener {
11     /**
12      * limit of selectable checkboxes
13      */
14     private final int maxCheckBoxesSelectable;
15     /**
16      * "listened" checkboxes
17      */
18     private final JCheckBox[] checkBoxes;
19     /**
20      * Selected checkboxes
21      */
22     private int selectionCounter = 0;
23 
24     /**
25      * Create a new checkBoxListener
26      *
27      * @param limit      maximum number of selectable checkBoxes
28      * @param checkBoxes checkboxes that will be listened by this listener
29      */
30     public CheckBoxListener(int limit, JCheckBox[] checkBoxes) {
31         this.maxCheckBoxesSelectable = limit;
32         this.checkBoxes = checkBoxes;
33     }
34 
35     /**
36      * As soon as one checkbox has been selected, verify that selected checkBoxes are less than maximum
37      *
38      * @param e the event to be processed
39      */
40     @Override
41     public void itemStateChanged(ItemEvent e) {
42         JCheckBox source = (JCheckBox) e.getSource();
43         if (source.isSelected()) {
44             selectionCounter++;
45             // check for max selections:
46             if (selectionCounter == maxCheckBoxesSelectable)
47                 for (JCheckBox box : checkBoxes)
48                     if (!box.isSelected())
49                         box.setEnabled(false);
50         } else {
51             selectionCounter--;
52             // check for less than max selections:
53             if (selectionCounter < maxCheckBoxesSelectable)
54                 for (JCheckBox box : checkBoxes)
55                     box.setEnabled(true);
56         }
57     }
58 }