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<TITLE>Converting a KeyStroke to a String (Java Developers Almanac Example)
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<h3>e859. Converting a KeyStroke to a String</h3>
The <code>KeyStroke.toString()</code> method does not return a string that can
be parsed by <code>KeyStroke.getKeyStroke()</code>. The method
<code>keyStroke2String()</code> in this example returns a string that is
parseable by <code>KeyStroke.getKeyStroke()</code>.
However, there is one keystroke that cannot be represented as a string
that can be parsed back to a keystroke - - a typed space character. In
order to bind an action to a typed space character,
<code>KeyStroke.getKeyStroke(new Character(' '), 0)</code> needs to be called.
<pre> public static String keyStroke2String(KeyStroke key) {
StringBuffer s = new StringBuffer(50);
int m = key.getModifiers();
if ((m & (InputEvent.SHIFT_DOWN_MASK|InputEvent.SHIFT_MASK)) != 0) {
s.append("shift ");
}
if ((m & (InputEvent.CTRL_DOWN_MASK|InputEvent.CTRL_MASK)) != 0) {
s.append("ctrl ");
}
if ((m & (InputEvent.META_DOWN_MASK|InputEvent.META_MASK)) != 0) {
s.append("meta ");
}
if ((m & (InputEvent.ALT_DOWN_MASK|InputEvent.ALT_MASK)) != 0) {
s.append("alt ");
}
if ((m & (InputEvent.BUTTON1_DOWN_MASK|InputEvent.BUTTON1_MASK)) != 0) {
s.append("button1 ");
}
if ((m & (InputEvent.BUTTON2_DOWN_MASK|InputEvent.BUTTON2_MASK)) != 0) {
s.append("button2 ");
}
if ((m & (InputEvent.BUTTON3_DOWN_MASK|InputEvent.BUTTON3_MASK)) != 0) {
s.append("button3 ");
}
switch (key.getKeyEventType()) {
case KeyEvent.KEY_TYPED:
s.append("typed ");
s.append(key.getKeyChar() + " ");
break;
case KeyEvent.KEY_PRESSED:
s.append("pressed ");
s.append(getKeyText(key.getKeyCode()) + " ");
break;
case KeyEvent.KEY_RELEASED:
s.append("released ");
s.append(getKeyText(key.getKeyCode()) + " ");
break;
default:
s.append("unknown-event-type ");
break;
}
return s.toString();
}
public static String getKeyText(int keyCode) {
if (keyCode >= KeyEvent.VK_0 && keyCode <= KeyEvent.VK_9 ||
keyCode >= KeyEvent.VK_A && keyCode <= KeyEvent.VK_Z) {
return String.valueOf((char)keyCode);
}
switch(keyCode) {
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_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_CONTROL: return "CONTROL";
case KeyEvent.VK_ALT: return "ALT";
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";
// numpad numeric keys handled below
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_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_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_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";
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