Java Tutorial/SWT/KeyEvent

Print key state, code and character

/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
/*
 * Control example snippet: print key state, code and character
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 * 
 * @since 3.0
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
public class KeyCodeCharacterState {
  static String stateMask(int stateMask) {
    String string = "";
    if ((stateMask & SWT.CTRL) != 0)
      string += " CTRL";
    if ((stateMask & SWT.ALT) != 0)
      string += " ALT";
    if ((stateMask & SWT.SHIFT) != 0)
      string += " SHIFT";
    if ((stateMask & SWT.ruMAND) != 0)
      string += " COMMAND";
    return string;
  }
  static String character(char character) {
    switch (character) {
    case 0:
      return ""\\0"";
    case SWT.BS:
      return ""\\b"";
    case SWT.CR:
      return ""\\r"";
    case SWT.DEL:
      return "DEL";
    case SWT.ESC:
      return "ESC";
    case SWT.LF:
      return ""\\n"";
    case SWT.TAB:
      return ""\\t"";
    }
    return """ + character + """;
  }
  static String keyCode(int keyCode) {
    switch (keyCode) {
    /* Keyboard and Mouse Masks */
    case SWT.ALT:
      return "ALT";
    case SWT.SHIFT:
      return "SHIFT";
    case SWT.CONTROL:
      return "CONTROL";
    case SWT.ruMAND:
      return "COMMAND";
    /* Non-Numeric Keypad Keys */
    case SWT.ARROW_UP:
      return "ARROW_UP";
    case SWT.ARROW_DOWN:
      return "ARROW_DOWN";
    case SWT.ARROW_LEFT:
      return "ARROW_LEFT";
    case SWT.ARROW_RIGHT:
      return "ARROW_RIGHT";
    case SWT.PAGE_UP:
      return "PAGE_UP";
    case SWT.PAGE_DOWN:
      return "PAGE_DOWN";
    case SWT.HOME:
      return "HOME";
    case SWT.END:
      return "END";
    case SWT.INSERT:
      return "INSERT";
    /* Virtual and Ascii Keys */
    case SWT.BS:
      return "BS";
    case SWT.CR:
      return "CR";
    case SWT.DEL:
      return "DEL";
    case SWT.ESC:
      return "ESC";
    case SWT.LF:
      return "LF";
    case SWT.TAB:
      return "TAB";
    /* Functions Keys */
    case SWT.F1:
      return "F1";
    case SWT.F2:
      return "F2";
    case SWT.F3:
      return "F3";
    case SWT.F4:
      return "F4";
    case SWT.F5:
      return "F5";
    case SWT.F6:
      return "F6";
    case SWT.F7:
      return "F7";
    case SWT.F8:
      return "F8";
    case SWT.F9:
      return "F9";
    case SWT.F10:
      return "F10";
    case SWT.F11:
      return "F11";
    case SWT.F12:
      return "F12";
    case SWT.F13:
      return "F13";
    case SWT.F14:
      return "F14";
    case SWT.F15:
      return "F15";
    /* Numeric Keypad Keys */
    case SWT.KEYPAD_ADD:
      return "KEYPAD_ADD";
    case SWT.KEYPAD_SUBTRACT:
      return "KEYPAD_SUBTRACT";
    case SWT.KEYPAD_MULTIPLY:
      return "KEYPAD_MULTIPLY";
    case SWT.KEYPAD_DIVIDE:
      return "KEYPAD_DIVIDE";
    case SWT.KEYPAD_DECIMAL:
      return "KEYPAD_DECIMAL";
    case SWT.KEYPAD_CR:
      return "KEYPAD_CR";
    case SWT.KEYPAD_0:
      return "KEYPAD_0";
    case SWT.KEYPAD_1:
      return "KEYPAD_1";
    case SWT.KEYPAD_2:
      return "KEYPAD_2";
    case SWT.KEYPAD_3:
      return "KEYPAD_3";
    case SWT.KEYPAD_4:
      return "KEYPAD_4";
    case SWT.KEYPAD_5:
      return "KEYPAD_5";
    case SWT.KEYPAD_6:
      return "KEYPAD_6";
    case SWT.KEYPAD_7:
      return "KEYPAD_7";
    case SWT.KEYPAD_8:
      return "KEYPAD_8";
    case SWT.KEYPAD_9:
      return "KEYPAD_9";
    case SWT.KEYPAD_EQUAL:
      return "KEYPAD_EQUAL";
    /* Other keys */
    case SWT.CAPS_LOCK:
      return "CAPS_LOCK";
    case SWT.NUM_LOCK:
      return "NUM_LOCK";
    case SWT.SCROLL_LOCK:
      return "SCROLL_LOCK";
    case SWT.PAUSE:
      return "PAUSE";
    case SWT.BREAK:
      return "BREAK";
    case SWT.PRINT_SCREEN:
      return "PRINT_SCREEN";
    case SWT.HELP:
      return "HELP";
    }
    return character((char) keyCode);
  }
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    Listener listener = new Listener() {
      public void handleEvent(Event e) {
        String string = e.type == SWT.KeyDown ? "DOWN:" : "UP  :";
        string += " stateMask=0x" + Integer.toHexString(e.stateMask) + stateMask(e.stateMask) + ",";
        string += " keyCode=0x" + Integer.toHexString(e.keyCode) + " " + keyCode(e.keyCode) + ",";
        string += " character=0x" + Integer.toHexString(e.character) + " " + character(e.character);
        System.out.println(string);
      }
    };
    shell.addListener(SWT.KeyDown, listener);
    shell.addListener(SWT.KeyUp, listener);
    shell.setSize(200, 200);
    
    shell.setText("Press Key on the blank window");
    
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}