Function edgeScroll

src/OpenLoco/src/Input/Keyboard.cpp:410–487

    }

    static void edgeScroll()
    {
        if (!Ui::hasInputFocus())
        {
            return;
        }

        if (Tutorial::state() != Tutorial::State::none)
        {
            return;
        }

        if (!Config::get().edgeScrolling)
        {
            return;
        }

        if (Input::state() != State::normal && Input::state() != State::dropdownActive)
        {
            return;
        }

        if (hasKeyModifier(KeyModifier::shift) || hasKeyModifier(KeyModifier::control))
        {
            return;
        }

        Ui::Point delta = { 0, 0 };
        auto cursor = getCursorPosScaled();

        if (cursor.x == 0)
        {
            delta.x -= Config::get().edgeScrollingSpeed;
        }

        if (cursor.x >= Ui::width() - 1)
        {
            delta.x += Config::get().edgeScrollingSpeed;
        }

        if (cursor.y == 0)
        {
            delta.y -= Config::get().edgeScrollingSpeed;
        }

        if (cursor.y >= Ui::height() - 1)
        {
            delta.y += Config::get().edgeScrollingSpeed;
        }

        if (delta.x == 0 && delta.y == 0)
        {
            return;
        }

        auto main = WindowManager::getMainWindow();
        if (main->hasFlags(WindowFlags::viewportNoScrolling))
        {