Java Tutorial/SWT/KeyEvent

Print key state, code and character

   <source lang="java">

/*******************************************************************************

* 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();
 }

}</source>