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);
}