git.gag.com Git - debian/openrocket/blob - core/src/net/sf/openrocket/gui/preset/DeselectableComboBox.java

   1 package net.sf.openrocket.gui.preset;
   2
   3 import javax.swing.*;
   4 import javax.swing.plaf.basic.BasicComboBoxRenderer;
   5 import java.awt.*;
   6 import java.util.HashSet;
   7 import java.util.Set;
   8
   9 /**
  10  * A combo box that allows for items to be deselected.
  11  */
  12 public class DeselectableComboBox extends JComboBox {
  13
  14     public DeselectableComboBox() {
  15         super();
  16         super.setRenderer(new DeselectedtemsRenderer());
  17     }
  18
  19     private Set disabled_items = new HashSet();
  20
  21     public void addItem(Object anObject, boolean disabled) {
  22         super.addItem(anObject);
  23         if (disabled) {
  24             disabled_items.add(getItemCount() - 1);
  25         }
  26     }
  27
  28     @Override
  29     public void removeAllItems() {
  30         super.removeAllItems();
  31         disabled_items = new HashSet();
  32     }
  33
  34     @Override
  35     public void removeItemAt(final int anIndex) {
  36         super.removeItemAt(anIndex);
  37         disabled_items.remove(anIndex);
  38     }
  39
  40     @Override
  41     public void removeItem(final Object anObject) {
  42         for (int i = 0; i < getItemCount(); i++) {
  43             if (getItemAt(i) == anObject) {
  44                 disabled_items.remove(i);
  45             }
  46         }
  47         super.removeItem(anObject);
  48     }
  49
  50     @Override
  51     public void setSelectedIndex(int index) {
  52         if (!disabled_items.contains(index)) {
  53             super.setSelectedIndex(index);
  54         }
  55     }
  56
  57     private class DeselectedtemsRenderer extends BasicComboBoxRenderer {
  58
  59         @Override
  60         public Component getListCellRendererComponent(JList list,
  61                                                       Object value,
  62                                                       int index,
  63                                                       boolean isSelected,
  64                                                       boolean cellHasFocus) {
  65
  66             if (isSelected) {
  67                 setBackground(list.getSelectionBackground());
  68                 setForeground(list.getSelectionForeground());
  69             }
  70             else {
  71                 setBackground(list.getBackground());
  72                 setForeground(list.getForeground());
  73             }
  74             if (disabled_items.contains(index)) {
  75                 setBackground(list.getBackground());
  76                 setForeground(UIManager.getColor("Label.disabledForeground"));
  77             }
  78             setFont(list.getFont());
  79             setText((value == null) ? "" : value.toString());
  80             return this;
  81         }
  82     }
  83 }