JComboBox: getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT) : JComboBox « javax.swing « Java by API

1. Java by API
2. javax.swing
3. JComboBox

JComboBox: getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT)

  

import java.awt.Dimension;
import java.awt.Event;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.util.Vector;

import javax.swing.AbstractAction;
import javax.swing.ComboBoxEditor;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.KeyStroke;

public class MainClass extends JFrame {
  JComboBox jcb;

  MainClass(String title) {
    super(title);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JPanel jp = new JPanel();

    Vector v = new Vector();
    v.add("A");
    v.add("B");
    v.add("C");

    jcb = new JComboBox(v);
    jcb.setEditable(true);

    KeyStroke ks = KeyStroke.getKeyStroke(KeyEvent.VK_DELETE, Event.CTRL_MASK);

    jcb.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT).put(ks, "clearEditor");
    jcb.getActionMap().put("clearEditor", new ClearEditorAction());

    jp.setPreferredSize(new Dimension(200, 35));
    jp.add(jcb);
    getContentPane().add(jp);

    pack();
    setVisible(true);
  }

  public static void main(String[] args) {
    new MainClass("Binding Demo3");
  }
}

class ClearEditorAction extends AbstractAction {
  public void actionPerformed(ActionEvent e) {
    JComboBox jcb = (JComboBox) e.getSource();

    ComboBoxEditor cbe = jcb.getEditor();

    cbe.setItem("");
  }
}

           
         
    
  

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