ui/ListSnapshot.java

   1 package be.nikiroo.utils.ui;
   2
   3 import java.util.ArrayList;
   4 import java.util.List;
   5
   6 import javax.swing.JList;
   7
   8 public class ListSnapshot {
   9         private JList list;
  10         private List<Object> elements = new ArrayList<Object>();
  11
  12         public ListSnapshot(JList list) {
  13                 this.list = list;
  14
  15                 for (int index : list.getSelectedIndices()) {
  16                         elements.add(list.getModel().getElementAt(index));
  17                 }
  18         }
  19
  20         public void apply() {
  21                 applyTo(list);
  22         }
  23
  24         public void applyTo(JList list) {
  25                 List<Integer> indices = new ArrayList<Integer>();
  26                 for (int i = 0; i < list.getModel().getSize(); i++) {
  27                         Object newObject = list.getModel().getElementAt(i);
  28                         for (Object oldObject : elements) {
  29                                 if (isSameElement(oldObject, newObject)) {
  30                                         indices.add(i);
  31                                         break;
  32                                 }
  33                         }
  34                 }
  35
  36                 int a[] = new int[indices.size()];
  37                 for (int i = 0; i < indices.size(); i++) {
  38                         a[i] = indices.get(i);
  39                 }
  40                 list.setSelectedIndices(a);
  41         }
  42
  43         // You can override this
  44         protected boolean isSameElement(Object oldElement, Object newElement) {
  45                 if (oldElement == null || newElement == null)
  46                         return oldElement == null && newElement == null;
  47
  48                 return oldElement.toString().equals(newElement.toString());
  49         }
  50
  51         @Override
  52         public String toString() {
  53                 StringBuilder builder = new StringBuilder();
  54                 builder.append("List Snapshot of: ").append(list).append("\n");
  55                 builder.append("Selected elements:\n");
  56                 for (Object element : elements) {
  57                         builder.append("\t").append(element).append("\n");
  58                 }
  59
  60                 return builder.toString();
  61         }
  62 }