KeyTextComponent.java Source code

Introduction

Here is the source code for KeyTextComponent.java

Source

import java.awt.AWTEventMulticaster;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JTextField;

public class KeyTextComponent extends JComponent {
    private ActionListener actionListenerList = null;

    public KeyTextComponent() {
        setBackground(Color.CYAN);
        KeyListener internalKeyListener = new KeyAdapter() {
            public void keyPressed(KeyEvent keyEvent) {
                if (actionListenerList != null) {
                    int keyCode = keyEvent.getKeyCode();
                    String keyText = KeyEvent.getKeyText(keyCode);
                    ActionEvent actionEvent = new ActionEvent(this, ActionEvent.ACTION_PERFORMED, keyText);
                    actionListenerList.actionPerformed(actionEvent);
                }
            }
        };
        MouseListener internalMouseListener = new MouseAdapter() {
            public void mousePressed(MouseEvent mouseEvent) {
                requestFocusInWindow();
            }
        };
        addKeyListener(internalKeyListener);
        addMouseListener(internalMouseListener);
    }

    public void addActionListener(ActionListener actionListener) {
        actionListenerList = AWTEventMulticaster.add(actionListenerList, actionListener);
    }

    public void removeActionListener(ActionListener actionListener) {
        actionListenerList = AWTEventMulticaster.remove(actionListenerList, actionListener);
    }

    public boolean isFocusable() {
        return true;
    }

    public static void main(String[] a) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new KeyTextComponent(), BorderLayout.CENTER);
        JTextField field = new JTextField();
        field.setText("Click above blank area to request focus");
        frame.add(field, BorderLayout.SOUTH);
        frame.setSize(300, 100);
        frame.setVisible(true);
        field.requestFocus();
    }
}