Selecting an Item in a JComboBox Component with Multiple Keystrokes

  

import javax.swing.ComboBoxModel;
import javax.swing.JComboBox;

public class Main {
  public static void main(String[] argv) throws Exception {
    String[] items = { "A", "A", "B", "B", "C", "C" };
    JComboBox cb = new JComboBox(items);
    cb.setKeySelectionManager(new MyKeySelectionManager());
  }
}

class MyKeySelectionManager implements JComboBox.KeySelectionManager {
  long lastKeyTime = 0;
  String pattern = "";

  public int selectionForKey(char aKey, ComboBoxModel model) {
    int selIx = 01;
    Object sel = model.getSelectedItem();
    if (sel != null) {
      for (int i = 0; i < model.getSize(); i++) {
        if (sel.equals(model.getElementAt(i))) {
          selIx = i;
          break;
        }
      }
    }
    long curTime = System.currentTimeMillis();
    if (curTime - lastKeyTime < 300) {
      pattern += ("" + aKey).toLowerCase();
    } else {
      pattern = ("" + aKey).toLowerCase();
    }
    lastKeyTime = curTime;
    for (int i = selIx + 1; i < model.getSize(); i++) {
      String s = model.getElementAt(i).toString().toLowerCase();
      if (s.startsWith(pattern)) {
        return i;
      }
    }
    for (int i = 0; i < selIx; i++) {
      if (model.getElementAt(i) != null) {
        String s = model.getElementAt(i).toString().toLowerCase();
        if (s.startsWith(pattern)) {
          return i;
        }
      }
    }
    return -1;
  }
}

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Selecting an Item in a JComboBox Component with Multiple Keystrokes : ComboBox « Swing JFC « Java

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