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About Ilias Tsagklis

Ilias Tsagklis
Ilias is a software developer turned online entrepreneur. He is co-founder and Executive Editor at Java Code Geeks.

List Key strokes example

In this example we are going to see how to list all Key Strokes in Java. This is very useful when you want to inform users of the application or the client code about all available key strokes.

Basically all you have to do in order to list key strokes, one should follows these steps:

  • Create an input device like a JButton.
  • Use JButton.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW) call in order to get an InputMap that contains all the key strokes that can be bundled with this component.
  • Use InputMap.keys(), InputMap.allKeys() to get all the key codes.
  • Use the InputEvent and KeyEvent masks to convert key codes into string in order to print it to the output.

Let’s see the code:

package com.javacodegeeks.snippets.desktop;

import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;

import javax.swing.Action;
import javax.swing.InputMap;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.KeyStroke;

public class Main {

    public static void main(String[] argv) throws Exception {


  JButton cmp = new JButton("button");

  InputMap m = cmp.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);

  listKeyStrokes(m, m.keys());

  listKeyStrokes(m, m.allKeys());
    }

    static void listKeyStrokes(InputMap m, KeyStroke[] keyStroke) {

  if (keyStroke == null) {


return;

  }

  for (int c = 0; c < keyStroke.length; c++) {



keyTotString(keyStroke);



while (m.get(keyStroke) == null) {


    m = m.getParent();


}


if (m.get(keyStroke) instanceof String) {


    String act = (String) m.get(keyStroke);


} else {


    Action act = (Action) m.get(keyStroke);


}

  }
    }

    static void keyTotString(KeyStroke key) {

  int mods = key.getModifiers();


  if ((mods & (InputEvent.BUTTON3_DOWN_MASK | InputEvent.BUTTON3_MASK)) != 0) {


System.out.println("button3 ");

  }

  if ((mods & (InputEvent.CTRL_DOWN_MASK | InputEvent.CTRL_MASK)) != 0) {


System.out.println("ctrl ");

  }


  if ((mods & (InputEvent.ALT_DOWN_MASK | InputEvent.ALT_MASK)) != 0) {


System.out.println("alt ");

  }

  if ((mods & (InputEvent.META_DOWN_MASK | InputEvent.META_MASK)) != 0) {


System.out.println("meta ");

  }

  if ((mods & (InputEvent.BUTTON1_DOWN_MASK | InputEvent.BUTTON1_MASK)) != 0) {


System.out.println("button1 ");

  }

  if ((mods & (InputEvent.BUTTON2_DOWN_MASK | InputEvent.BUTTON2_MASK)) != 0) {


System.out.println("button2 ");

  }


  if ((mods & (InputEvent.SHIFT_DOWN_MASK | InputEvent.SHIFT_MASK)) != 0) {


System.out.println("shift ");

  }

  switch (key.getKeyEventType()) {



case KeyEvent.KEY_RELEASED:


    System.out.println("released ");


    System.out.println(getText(key.getKeyCode()) + " ");


    break;


case KeyEvent.KEY_PRESSED:


    System.out.println("pressed ");


    System.out.println(getText(key.getKeyCode()) + " ");


    break;


case KeyEvent.KEY_TYPED:


    System.out.println("typed ");


    System.out.println(key.getKeyChar() + " ");


    break;



default:


    System.out.println("unknown-event-type ");


    break;

  }
    }

    static String getText(int key) {

  if (key >= KeyEvent.VK_0 && key <= KeyEvent.VK_9 || key >= KeyEvent.VK_A


    && key <= KeyEvent.VK_Z) {


return String.valueOf((char) key);

  }


  switch (key) {


case KeyEvent.VK_F1:


    return "F1";


case KeyEvent.VK_F2:


    return "F2";


case KeyEvent.VK_F3:


    return "F3";


case KeyEvent.VK_F4:


    return "F4";


case KeyEvent.VK_F5:


    return "F5";


case KeyEvent.VK_F6:


    return "F6";


case KeyEvent.VK_F7:


    return "F7";


case KeyEvent.VK_F8:


    return "F8";


case KeyEvent.VK_F9:


    return "F9";


case KeyEvent.VK_F10:


    return "F10";


case KeyEvent.VK_F11:


    return "F11";


case KeyEvent.VK_F12:


    return "F12";


case KeyEvent.VK_F13:


    return "F13";


case KeyEvent.VK_F14:


    return "F14";


case KeyEvent.VK_F15:


    return "F15";


case KeyEvent.VK_F16:


    return "F16";


case KeyEvent.VK_F17:


    return "F17";


case KeyEvent.VK_F18:


    return "F18";


case KeyEvent.VK_F19:


    return "F19";


case KeyEvent.VK_F20:


    return "F20";


case KeyEvent.VK_F21:


    return "F21";


case KeyEvent.VK_F22:


    return "F22";


case KeyEvent.VK_F23:


    return "F23";


case KeyEvent.VK_F24:


    return "F24";


case KeyEvent.VK_CONTROL:


    return "CONTROL";


case KeyEvent.VK_ALT:


    return "ALT";


case KeyEvent.VK_COMMA:


    return "COMMA";


case KeyEvent.VK_PERIOD:


    return "PERIOD";


case KeyEvent.VK_SLASH:


    return "SLASH";


case KeyEvent.VK_SEMICOLON:


    return "SEMICOLON";


case KeyEvent.VK_EQUALS:


    return "EQUALS";


case KeyEvent.VK_OPEN_BRACKET:


    return "OPEN_BRACKET";


case KeyEvent.VK_BACK_SLASH:


    return "BACK_SLASH";


case KeyEvent.VK_CLOSE_BRACKET:


    return "CLOSE_BRACKET";


case KeyEvent.VK_PAUSE:


    return "PAUSE";


case KeyEvent.VK_CAPS_LOCK:


    return "CAPS_LOCK";


case KeyEvent.VK_ESCAPE:


    return "ESCAPE";


case KeyEvent.VK_SPACE:


    return "SPACE";


case KeyEvent.VK_PAGE_UP:


    return "PAGE_UP";


case KeyEvent.VK_PAGE_DOWN:


    return "PAGE_DOWN";


case KeyEvent.VK_END:


    return "END";


case KeyEvent.VK_HOME:


    return "HOME";


case KeyEvent.VK_LEFT:


    return "LEFT";


case KeyEvent.VK_UP:


    return "UP";


case KeyEvent.VK_RIGHT:


    return "RIGHT";


case KeyEvent.VK_DOWN:


    return "DOWN";


case KeyEvent.VK_MULTIPLY:


    return "MULTIPLY";


case KeyEvent.VK_ADD:


    return "ADD";


case KeyEvent.VK_SEPARATOR:


    return "SEPARATOR";


case KeyEvent.VK_SUBTRACT:


    return "SUBTRACT";


case KeyEvent.VK_ENTER:


    return "ENTER";


case KeyEvent.VK_BACK_SPACE:


    return "BACK_SPACE";


case KeyEvent.VK_TAB:


    return "TAB";


case KeyEvent.VK_CANCEL:


    return "CANCEL";


case KeyEvent.VK_CLEAR:


    return "CLEAR";


case KeyEvent.VK_SHIFT:


    return "SHIFT";


case KeyEvent.VK_DECIMAL:


    return "DECIMAL";


case KeyEvent.VK_DIVIDE:


    return "DIVIDE";


case KeyEvent.VK_DELETE:


    return "DELETE";


case KeyEvent.VK_NUM_LOCK:


    return "NUM_LOCK";


case KeyEvent.VK_SCROLL_LOCK:


    return "SCROLL_LOCK";


case KeyEvent.VK_PRINTSCREEN:


    return "PRINTSCREEN";


case KeyEvent.VK_INSERT:


    return "INSERT";


case KeyEvent.VK_HELP:


    return "HELP";


case KeyEvent.VK_META:


    return "META";


case KeyEvent.VK_BACK_QUOTE:


    return "BACK_QUOTE";


case KeyEvent.VK_QUOTE:


    return "QUOTE";


case KeyEvent.VK_KP_UP:


    return "KP_UP";


case KeyEvent.VK_KP_DOWN:


    return "KP_DOWN";


case KeyEvent.VK_KP_LEFT:


    return "KP_LEFT";


case KeyEvent.VK_KP_RIGHT:


    return "KP_RIGHT";


case KeyEvent.VK_DEAD_GRAVE:


    return "DEAD_GRAVE";


case KeyEvent.VK_DEAD_ACUTE:


    return "DEAD_ACUTE";


case KeyEvent.VK_DEAD_CIRCUMFLEX:


    return "DEAD_CIRCUMFLEX";


case KeyEvent.VK_DEAD_TILDE:


    return "DEAD_TILDE";


case KeyEvent.VK_DEAD_MACRON:


    return "DEAD_MACRON";


case KeyEvent.VK_DEAD_BREVE:


    return "DEAD_BREVE";


case KeyEvent.VK_DEAD_ABOVEDOT:


    return "DEAD_ABOVEDOT";


case KeyEvent.VK_DEAD_DIAERESIS:


    return "DEAD_DIAERESIS";


case KeyEvent.VK_DEAD_ABOVERING:


    return "DEAD_ABOVERING";


case KeyEvent.VK_DEAD_DOUBLEACUTE:


    return "DEAD_DOUBLEACUTE";


case KeyEvent.VK_DEAD_CARON:


    return "DEAD_CARON";


case KeyEvent.VK_DEAD_CEDILLA:


    return "DEAD_CEDILLA";


case KeyEvent.VK_DEAD_OGONEK:


    return "DEAD_OGONEK";


case KeyEvent.VK_DEAD_IOTA:


    return "DEAD_IOTA";


case KeyEvent.VK_DEAD_VOICED_SOUND:


    return "DEAD_VOICED_SOUND";


case KeyEvent.VK_DEAD_SEMIVOICED_SOUND:


    return "DEAD_SEMIVOICED_SOUND";


case KeyEvent.VK_AMPERSAND:


    return "AMPERSAND";


case KeyEvent.VK_ASTERISK:


    return "ASTERISK";


case KeyEvent.VK_QUOTEDBL:


    return "QUOTEDBL";


case KeyEvent.VK_LESS:


    return "LESS";


case KeyEvent.VK_GREATER:


    return "GREATER";


case KeyEvent.VK_BRACELEFT:


    return "BRACELEFT";


case KeyEvent.VK_BRACERIGHT:


    return "BRACERIGHT";


case KeyEvent.VK_AT:


    return "AT";


case KeyEvent.VK_COLON:


    return "COLON";


case KeyEvent.VK_CIRCUMFLEX:


    return "CIRCUMFLEX";


case KeyEvent.VK_DOLLAR:


    return "DOLLAR";


case KeyEvent.VK_EURO_SIGN:


    return "EURO_SIGN";


case KeyEvent.VK_EXCLAMATION_MARK:


    return "EXCLAMATION_MARK";


case KeyEvent.VK_INVERTED_EXCLAMATION_MARK:


    return "INVERTED_EXCLAMATION_MARK";


case KeyEvent.VK_LEFT_PARENTHESIS:


    return "LEFT_PARENTHESIS";


case KeyEvent.VK_NUMBER_SIGN:


    return "NUMBER_SIGN";


case KeyEvent.VK_MINUS:


    return "MINUS";


case KeyEvent.VK_PLUS:


    return "PLUS";


case KeyEvent.VK_RIGHT_PARENTHESIS:


    return "RIGHT_PARENTHESIS";


case KeyEvent.VK_UNDERSCORE:


    return "UNDERSCORE";


case KeyEvent.VK_FINAL:


    return "FINAL";


case KeyEvent.VK_CONVERT:


    return "CONVERT";


case KeyEvent.VK_NONCONVERT:


    return "NONCONVERT";


case KeyEvent.VK_ACCEPT:


    return "ACCEPT";


case KeyEvent.VK_MODECHANGE:


    return "MODECHANGE";


case KeyEvent.VK_KANA:


    return "KANA";


case KeyEvent.VK_KANJI:


    return "KANJI";


case KeyEvent.VK_ALPHANUMERIC:


    return "ALPHANUMERIC";


case KeyEvent.VK_KATAKANA:


    return "KATAKANA";


case KeyEvent.VK_HIRAGANA:


    return "HIRAGANA";


case KeyEvent.VK_FULL_WIDTH:


    return "FULL_WIDTH";


case KeyEvent.VK_HALF_WIDTH:


    return "HALF_WIDTH";


case KeyEvent.VK_ROMAN_CHARACTERS:


    return "ROMAN_CHARACTERS";


case KeyEvent.VK_ALL_CANDIDATES:


    return "ALL_CANDIDATES";


case KeyEvent.VK_PREVIOUS_CANDIDATE:


    return "PREVIOUS_CANDIDATE";


case KeyEvent.VK_CODE_INPUT:


    return "CODE_INPUT";


case KeyEvent.VK_JAPANESE_KATAKANA:


    return "JAPANESE_KATAKANA";


case KeyEvent.VK_JAPANESE_HIRAGANA:


    return "JAPANESE_HIRAGANA";


case KeyEvent.VK_JAPANESE_ROMAN:


    return "JAPANESE_ROMAN";


case KeyEvent.VK_KANA_LOCK:


    return "KANA_LOCK";


case KeyEvent.VK_INPUT_METHOD_ON_OFF:


    return "INPUT_METHOD_ON_OFF";


case KeyEvent.VK_AGAIN:


    return "AGAIN";


case KeyEvent.VK_UNDO:


    return "UNDO";


case KeyEvent.VK_COPY:


    return "COPY";


case KeyEvent.VK_PASTE:


    return "PASTE";


case KeyEvent.VK_CUT:


    return "CUT";


case KeyEvent.VK_FIND:


    return "FIND";


case KeyEvent.VK_PROPS:


    return "PROPS";


case KeyEvent.VK_STOP:


    return "STOP";



case KeyEvent.VK_COMPOSE:


    return "COMPOSE";


case KeyEvent.VK_ALT_GRAPH:


    return "ALT_GRAPH";

  }


  if (key >= KeyEvent.VK_NUMPAD0 && key <= KeyEvent.VK_NUMPAD9) {


char c = (char) (key - KeyEvent.VK_NUMPAD0 + '0');


return "Number" + c;

  }


  return "unknown keyStroke(0x" + Integer.toString(key, 16) + ")";
    }
}

 
This was an example on how to list key strokes in Java.

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