Method updateCursorPosition

examples/text/Text.cpp:322–343

    }

    void updateCursorPosition(int offset)
    {
        const auto& string = text.getString();

        // The Unicode standard recommends that grapheme boundaries
        // be used as text insertion/deletion points since this is
        // what most users would expect from text editing software

        // We first increment/decrement the cursor based on user input
        cursorIndex = static_cast<std::size_t>(
            std::clamp(static_cast<int>(cursorIndex) + offset, 0, static_cast<int>(string.getSize())));

        // As long as we are not at a grapheme boundary yet, keep
        // moving the cursor position until we arrive at one
        while (cursorIndex < string.getSize() && !string.isGraphemeBoundary(cursorIndex))
            cursorIndex += static_cast<std::size_t>(offset ? (offset / std::abs(offset)) : 0);

        // If we are beyond the end of the string just return the correct
        // end-of-text position based on the direction of the text
        cursor.setPosition(
            cursorPositions[(cursorIndex >= cursorPositions.size()) ? cursorPositions.size() - 1 : cursorIndex]);
    }

    void handleMousePress(const sf::Vector2f& position)
    {