TelloKeyEvent.java

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.event.*;
import java.net.SocketException;

import javax.swing.*;

public class TelloKeyEvent extends JFrame implements KeyListener, ActionListener {

    private static final long serialVersionUID = 1L;
    JTextArea displayArea;
    JTextField typingArea;
    static final String newline = System.getProperty("line.separator");
    static Control ctlObj = new Control();

    /**
     * Establish Tello connection and GUI setup.  Only executes once.    
     */

    public static void main(String[] args) {

        
        // Tello setup
        try {
            ctlObj.connect();
        } catch (SocketException e) {
            e.printStackTrace();
        }

        

        //GUI setup
        // Use an appropriate Look and Feel
        try {
            //UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
            //UIManager.setLookAndFeel("com.sun.java.swing.plaf.gtk.GTKLookAndFeel");
            UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
        } catch (UnsupportedLookAndFeelException ex) {
            ex.printStackTrace();
        } catch (IllegalAccessException ex) {
            ex.printStackTrace();
        } catch (InstantiationException ex) {
            ex.printStackTrace();
        } catch (ClassNotFoundException ex) {
            ex.printStackTrace();
        }
        // Turn off metal's use of bold fonts
        UIManager.put("swing.boldMetal", Boolean.FALSE);
         
        //Schedule a job for event dispatch thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
        
    }

    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.  Only executes once.    
     */
    private static void createAndShowGUI() {
        //Create and set up the window.
        TelloKeyEvent frame = new TelloKeyEvent("Feedback Window");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         
        //Set up the content pane.
        frame.addComponentsToPane();
         
         
        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }
     
    /**
     * Add components to pane.  Only executes once.    
     */
    private void addComponentsToPane() {
         
        JButton button = new JButton("Clear");
        button.addActionListener(this);
         
        typingArea = new JTextField(20);
        typingArea.addKeyListener(this);
         
        //Uncomment this if you wish to turn off focus
        //traversal.  The focus subsystem consumes
        //focus traversal keys, such as Tab and Shift Tab.
        //If you uncomment the following line of code, this
        //disables focus traversal and the Tab events will
        //become available to the key event listener.
        //typingArea.setFocusTraversalKeysEnabled(false);
         
        displayArea = new JTextArea();
        displayArea.setEditable(false);
        JScrollPane scrollPane = new JScrollPane(displayArea);
        scrollPane.setPreferredSize(new Dimension(375, 125));
         
        getContentPane().add(typingArea, BorderLayout.PAGE_START);
        getContentPane().add(scrollPane, BorderLayout.CENTER);
        getContentPane().add(button, BorderLayout.PAGE_END);
    }
     
    public TelloKeyEvent(String name) {
        super(name);
    }
     
     
    /** Handle the key typed event from the text field. */
    public void keyTyped(KeyEvent e) {     
        //displayInfo(e, "KEY TYPED: ");
    }
     
    /** Handle the key pressed event from the text field. */
    public void keyPressed(KeyEvent e) {
        //Clear text box
        typingArea.setText("");
        //Return the focus to the typing area.
        typingArea.requestFocusInWindow();
        displayInfo(e, "KEY PRESSED: ");
    }
     
    /** Handle the key released event from the text field. */
    public void keyReleased(KeyEvent e) {
        //displayInfo(e, "KEY RELEASED: ");
    }
     
    /** Handle the button click. */
    public void actionPerformed(ActionEvent e) {
        //Clear the text components.
        displayArea.setText("");
        typingArea.setText("");
         
        //Return the focus to the typing area.
        typingArea.requestFocusInWindow();
    }
     
    /*
     * We have to jump through some hoops to avoid
     * trying to print non-printing characters
     * such as Shift.  (Not only do they not print,
     * but if you put them in a String, the characters
     * afterward won't show up in the text area.)
     */
    private void displayInfo(KeyEvent e, String keyStatus){
         
        //You should only rely on the key char if the event
        //is a key typed event.
        int id = e.getID();
        String keyString, telloResp;
        byte sendData[];

        // Capture keycode from action
        int keyCode = e.getKeyCode();
        sendData = ctlObj.decodeCmd(keyCode).getBytes();
        telloResp = ctlObj.sendCmd(sendData);
        keyString = ("Decoded message: " + ctlObj.decodeCmd(keyCode) + "\n"
            + "TELLO RESPONSE: " + telloResp);

        displayArea.append(keyStatus + newline
                + "    " + keyString + newline);

                /*
                + "    " + modString + newline
                + "    " + actionString + newline
                + "    " + locationString + newline);
                */
        displayArea.setCaretPosition(displayArea.getDocument().getLength());
        
    }
}