bool TextBox::Update()

in Kits/ATGTK/SampleGUI.cpp [4136:4299]
146 lines of code
54 McCabe index (conditional complexity)

bool TextBox::Update(float elapsedTime, const DirectX::Mouse::State& mstate, const DirectX::Keyboard::State& kbstate)
{
    UNREFERENCED_PARAMETER(elapsedTime);

    auto mgr = UIManager::Impl::s_uiManager;
    if (!mgr)
    {
        throw std::exception("UIManager");
    }

    // Handle mouse
    if ((m_style & c_StyleScrollBar) && (m_thumbRect.top != m_thumbRect.bottom))
    {
        if (mstate.x >= m_scrollRect.left && mstate.x < m_scrollRect.right
            && mstate.y >= m_scrollRect.top && mstate.y < m_scrollRect.bottom)
        {
            if (mgr->m_mouseButtonState.leftButton == Mouse::ButtonStateTracker::PRESSED)
            {
                if (mstate.y < m_thumbRect.top)
                {
                    if (!m_wordWrapLines.empty() && (m_lastHeight > 0))
                    {
                        int maxl = static_cast<int>(float(m_itemRect.bottom - m_itemRect.top - c_MarginSize * 2) / float(m_lastHeight));
                        m_topLine -= maxl;
                        if (m_topLine < 0)
                            m_topLine = 0;
                    }
                }
                else if (mstate.y > m_thumbRect.bottom)
                {
                    if (!m_wordWrapLines.empty() && (m_lastHeight > 0))
                    {
                        int maxl = static_cast<int>(float(m_itemRect.bottom - m_itemRect.top - c_MarginSize * 2) / float(m_lastHeight));
                        m_topLine += maxl;
                        if (m_topLine >= static_cast<int>(m_wordWrapLines.size()))
                            m_topLine = static_cast<int>(m_wordWrapLines.size() - 1);
                    }
                }
            }
            return true;
        }
    }

    if (mstate.scrollWheelValue > m_lastWheelValue)
    {
        if (!m_wordWrapLines.empty())
        {
            if (m_topLine > 0)
            {
                --m_topLine;
            }
        }
        m_lastWheelValue = mstate.scrollWheelValue;
        return true;
    }

    if (mstate.scrollWheelValue < m_lastWheelValue)
    {
        if (!m_wordWrapLines.empty())
        {
            ++m_topLine;
            if (m_topLine >= static_cast<int>(m_wordWrapLines.size()))
                m_topLine = static_cast<int>(m_wordWrapLines.size() - 1);
        }
        m_lastWheelValue = mstate.scrollWheelValue;
        return true;
    }

    // Handle keyboard

    if (kbstate.IsKeyDown(Keyboard::W) || kbstate.IsKeyDown(Keyboard::Up))
    {
        if (mgr->m_keyboardState.IsKeyPressed(Keyboard::W) || mgr->m_keyboardState.IsKeyPressed(Keyboard::Up))
        {
            mgr->m_heldTimer = c_KeypressRepeatDelay;
        }

        if (!m_wordWrapLines.empty() && mgr->m_heldTimer <= 0.f)
        {
            if (m_topLine > 0)
            {
                --m_topLine;
            }
            mgr->m_heldTimer = c_KeypressRepeatDelay;
        }
        return true;
    }
    else if (kbstate.IsKeyDown(Keyboard::S) || kbstate.IsKeyDown(Keyboard::Down))
    {
        if (mgr->m_keyboardState.IsKeyPressed(Keyboard::S) || mgr->m_keyboardState.IsKeyPressed(Keyboard::Down))
        {
            mgr->m_heldTimer = c_KeypressRepeatDelay;
        }

        if (!m_wordWrapLines.empty() && mgr->m_heldTimer <= 0.f)
        {
            ++m_topLine;
            if (m_topLine >= static_cast<int>(m_wordWrapLines.size()))
                m_topLine = static_cast<int>(m_wordWrapLines.size() - 1);
            mgr->m_heldTimer = c_KeypressRepeatDelay;
        }
        return true;
    }
    else if (kbstate.IsKeyDown(Keyboard::Home))
    {
        if (mgr->m_keyboardState.IsKeyPressed(Keyboard::Home))
        {
            m_topLine = 0;
        }

        return true;
    }
    else if (kbstate.IsKeyDown(Keyboard::End))
    {
        if (mgr->m_keyboardState.IsKeyPressed(Keyboard::End))
        {
            if (!m_wordWrapLines.empty())
            {
                m_topLine = static_cast<int>(m_wordWrapLines.size() - 1);
            }
        }

        return true;
    }
    else if (kbstate.IsKeyDown(Keyboard::PageUp))
    {
        if (mgr->m_keyboardState.IsKeyPressed(Keyboard::PageUp))
        {
            mgr->m_heldTimer = c_KeypressRepeatDelay;
        }

        if (!m_wordWrapLines.empty() && (m_lastHeight > 0) && mgr->m_heldTimer <= 0.f)
        {
            int maxl = static_cast<int>(float(m_itemRect.bottom - m_itemRect.top - c_MarginSize * 2) / float(m_lastHeight));
            m_topLine -= maxl;
            if (m_topLine < 0)
                m_topLine = 0;

            mgr->m_heldTimer = c_KeypressRepeatDelay;
        }
        return true;
    }
    else if (kbstate.IsKeyDown(Keyboard::PageDown))
    {
        if (mgr->m_keyboardState.IsKeyPressed(Keyboard::PageDown))
        {
            mgr->m_heldTimer = c_KeypressRepeatDelay;
        }

        if (!m_wordWrapLines.empty() && (m_lastHeight > 0) && mgr->m_heldTimer <= 0.f)
        {
            int maxl = static_cast<int>(float(m_itemRect.bottom - m_itemRect.top - c_MarginSize * 2) / float(m_lastHeight));
            m_topLine += maxl;
            if (m_topLine >= static_cast<int>(m_wordWrapLines.size()))
                m_topLine = static_cast<int>(m_wordWrapLines.size() - 1);

            mgr->m_heldTimer = c_KeypressRepeatDelay;
        }

        return true;
    }

    return false;
}