KeyStrokeUtils.java 文件源码

/**
 * Convert human-readable keystroke name to {@link KeyStroke} object.
 */
public static @CheckForNull KeyStroke getKeyStroke(
        @NonNull String keyStroke) {

    int modifiers = 0;
    while (true) {
        if (keyStroke.startsWith(EMACS_CTRL)) {
            modifiers |= InputEvent.CTRL_DOWN_MASK;
            keyStroke = keyStroke.substring(EMACS_CTRL.length());
        } else if (keyStroke.startsWith(EMACS_ALT)) {
            modifiers |= InputEvent.ALT_DOWN_MASK;
            keyStroke = keyStroke.substring(EMACS_ALT.length());
        } else if (keyStroke.startsWith(EMACS_SHIFT)) {
            modifiers |= InputEvent.SHIFT_DOWN_MASK;
            keyStroke = keyStroke.substring(EMACS_SHIFT.length());
        } else if (keyStroke.startsWith(EMACS_META)) {
            modifiers |= InputEvent.META_DOWN_MASK;
            keyStroke = keyStroke.substring(EMACS_META.length());
        } else if (keyStroke.startsWith(STRING_ALT)) {
            modifiers |= InputEvent.ALT_DOWN_MASK;
            keyStroke = keyStroke.substring(STRING_ALT.length());
        } else if (keyStroke.startsWith(STRING_META)) {
            modifiers |= InputEvent.META_DOWN_MASK;
            keyStroke = keyStroke.substring(STRING_META.length());
        } else {
            break;
        }
    }
    KeyStroke ks = Utilities.stringToKey (keyStroke);
    if (ks == null) { // Return null to indicate an invalid keystroke
        return null;
    } else {
        KeyStroke result = KeyStroke.getKeyStroke (ks.getKeyCode (), modifiers);
        return result;
    }
}