Method insertText

core/2d/TextFieldTTF.cpp:254–313

}

void TextFieldTTF::insertText(const char* text, size_t len)
{
    std::string insert(text, len);

    // insert \n means input end
    int pos = static_cast<int>(insert.find(StringUtils::AsciiCharacters::NewLine));
    if ((int)insert.npos != pos)
    {
        len = pos;
        insert.erase(pos);
    }

    if (len > 0)
    {
        if (_delegate && _delegate->onTextFieldInsertText(this, insert.c_str(), len))
        {
            // delegate doesn't want to insert text
            return;
        }

        std::size_t countInsertChar = StringUtils::countUTF8Chars(insert);
        _charCount += countInsertChar;

        if (_cursorEnabled)
        {
            std::string sText;
            sText.reserve(_inputText.length() + insert.length());
            sText += _inputText;
            auto pos = StringUtils::getUTF8ByteOffset(sText, _cursorPosition);
            if (pos != std::string::npos)
                sText.insert(pos, insert);
            else
                sText += insert;

            setCursorPosition(_cursorPosition + countInsertChar);

            setString(sText);
        }
        else
        {
            std::string sText(_inputText);
            sText.append(insert);
            setString(sText);
        }
    }

    if ((int)insert.npos == pos)
    {
        return;
    }

    // '\n' inserted, let delegate process first
    if (_delegate && _delegate->onTextFieldInsertText(this, "\n", 1))
    {
        return;
    }

    // if delegate hasn't processed, detach from IME by default