Casey Muratori of handmade hero fame is one of the original pioneers (potentially the first?) of immediate mode user-interfaces.
Check out this lecture/demo from nearly 20 years ago: https://www.youtube.com/watch?v=Z1qyvQsjK5Y
Check out this lecture/demo from nearly 20 years ago: https://www.youtube.com/watch?v=Z1qyvQsjK5Y
For example, the original Macintosh Toolbox (1984) worked _somewhat_ like that: on one hand, you had to handle events – even to the extent that you were just given a mouse click event, and had to dispatch it to the menu, scrollbars, title bars, etc; you then had to manually draw controls (but not while explicitly passing in their state.)
On the other hand, control state was "retained", to the extent that you updated their values, displayed them etc. with handles, and their state existed off in a linked list somewhere.
Here's how a later version of Inside Macintosh described having to handle a scroll bar operation, once a click and its location was identified. (I present it because it's long and aggravating...)
1. Use the FindControl, GetControlValue, and TrackControl functions to help calculate the scrolling distance.
2. If you are scrolling for any reason other than the user dragging the scroll box, use the SetControlValue procedure to move the scroll box a corresponding amount.
3. Use a routine—such as the QuickDraw procedure ScrollRect or the TextEdit procedure TEPinScroll—to move the bits displayed in the window by the calculated scrolling distance. Then either use a call that generates an update event or else directly call your application’s DoUpdate routine, which should perform the rest of these steps.
4. Use the UpdateControls procedure to update the scroll bars and then call the Window Manager procedure DrawGrowIcon to redraw the size box.
5. Use the QuickDraw procedure SetOrigin to change the window origin by an amount equal to the scroll bar settings so that the upper-left corner of the document lies at (0,0) in the window’s local coordinate system. (You perform this step so that your application’s document-drawing routines can draw in the correct area of the window.)
6. Call your application’s routines for redrawing the document inside the window.
7. Use the SetOrigin procedure to reset the window origin to (0,0) so that future Window Manager and Control Manager routines draw in the correct area of the window.
8. Return to your event loop.
These steps are explained in greater detail in the rest of this section.