Responding to Button using KeyBIndings

Question

I want to make a program with these goals:

1) Make a JButton 2) Attach the button to a key (The \"A\" Key) using KeyBindings 3) Execute some code when \"A\" is clicked

Answer 1

Two ways I can think of:

• Have JButton and and Key Bindings share the same AbstractAction, or perhaps better
• Simply call doClick() on the button from the key binding.

KeyBindingEg.java

import java.awt.event.*;
import javax.swing.*;

public class KeyBindingEg extends JPanel {
   private JButton btnA = new JButton();

   public KeyBindingEg() {
      Action btnAction = new ActionOne("A");
      Action keyBindingAction = new ActionTwo();

      int condition = JLabel.WHEN_IN_FOCUSED_WINDOW;
      InputMap inputmap = btnA.getInputMap(condition);
      ActionMap actionmap = btnA.getActionMap();

      final String aKeyPressed = "a key pressed";
      inputmap.put(KeyStroke.getKeyStroke(KeyEvent.VK_A, 0), aKeyPressed );

      actionmap.put(aKeyPressed, keyBindingAction);
      // actionmap.put(aKeyPressed, btnAction); // one or the other, your choice

      btnA.setAction(btnAction);
      add(btnA);
   }

   private class ActionOne extends AbstractAction {
      public ActionOne(String text) {
         super(text);
      }

      @Override
      public void actionPerformed(ActionEvent e) {
         sharedMethod();
      }
   }

   private class ActionTwo extends AbstractAction {
      @Override
      public void actionPerformed(ActionEvent e) {
         btnA.doClick();
      }
   }

   private void sharedMethod() {
      System.out.println("Method called by either key bindings or action listener");
   }

   private static void createAndShowGui() {
      JFrame frame = new JFrame("KeyBindingEg");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(new KeyBindingEg());
      frame.pack();
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }
}