Returns true if the keyCode produces a (US keyboard) character. Note: This does not (yet) cover characters on non-US keyboards (Russian, Hebrew, etc.).
Source
static bool isCharacterKey(int keyCode) {
if ((keyCode >= ZERO && keyCode <= NINE) ||
(keyCode >= NUM_ZERO && keyCode <= NUM_MULTIPLY) ||
(keyCode >= A && keyCode <= Z)) {
return true;
}
// Safari sends zero key code for non-latin characters.
if (Device.isWebKit && keyCode == 0) {
return true;
}
return (keyCode == SPACE ||
keyCode == QUESTION_MARK ||
keyCode == NUM_PLUS ||
keyCode == NUM_MINUS ||
keyCode == NUM_PERIOD ||
keyCode == NUM_DIVISION ||
keyCode == SEMICOLON ||
keyCode == FF_SEMICOLON ||
keyCode == DASH ||
keyCode == EQUALS ||
keyCode == FF_EQUALS ||
keyCode == COMMA ||
keyCode == PERIOD ||
keyCode == SLASH ||
keyCode == APOSTROPHE ||
keyCode == SINGLE_QUOTE ||
keyCode == OPEN_SQUARE_BRACKET ||
keyCode == BACKSLASH ||
keyCode == CLOSE_SQUARE_BRACKET);
}