Function InputViewportDragBegin

src/openrct2-ui/input/MouseInput.cpp:532–553

#pragma region Viewport dragging

    static void InputViewportDragBegin(WindowBase& w)
    {
        w.flags.unset(WindowFlag::scrollingToLocation);
        _inputState = InputState::viewportRight;
        _dragWidget.windowClassification = w.classification;
        _dragWidget.windowNumber = w.number;
        _ticksSinceDragStart = gCurrentRealTimeTicks;
        auto cursorPosition = ContextGetCursorPosition();
        gInputDragLast = cursorPosition;
        if (!Config::Get().general.invertViewportDrag)
        {
            ContextHideCursor();
        }

        // Only unfollow sprites for the main window or ‘extra viewport’ windows.
        // Don’t unfollow for windows where the viewport is always supposed to follow (e.g. Ride, Guest, Staff).
        auto mainWindow = WindowGetMain();
        if (&w == mainWindow || w.classification == WindowClass::viewport)
        {
            WindowUnfollowSprite(w);
        }
    }

    static void InputViewportDragContinue()
    {