Function internalUTF8MoveLeft

core/ui/UITextFieldEx.cpp:174–193

}

static std::string internalUTF8MoveLeft(std::string_view utf8Text, int length /* default utf8Text.length() */)
{
    if (!utf8Text.empty() && length > 0)
    {

        // get the delete byte number
        int deleteLen = 1;  // default, erase 1 byte

        while (length >= deleteLen && 0x80 == (0xC0 & utf8Text.at(length - deleteLen)))
        {
            ++deleteLen;
        }

        return std::string{utf8Text.data(), static_cast<size_t>(length - deleteLen)};
    }
    else
    {
        return std::string{utf8Text};
    }
}

static std::string internalUTF8MoveRight(std::string_view utf8Text, int length /* default utf8Text.length() */)
{