[fpc-devel] System.UITypes and Lazarus

[Marco van de Voort]

Op 9-2-2025 om 14:39 schreef Bart via fpc-devel:
> The Delphi compatible unit System.UITypes is getting out of sync with Lazarus.
> The reason for this is twofold:
> 1. the faster release cycle of Lazarus
(a bit extreme at the moment, but hopefully that will improve in the future)
> 2. the fact that Lazarus supports more widgetsets, for which we also
> need enumerations, and Delphi does not have these.
> This can lead to errors as described in
> https://gitlab.com/freepascal.org/lazarus/lazarus/-/issues/41300
>
> While this can be worked around, my question (no offense intended) it
> raises some questions in my head.
>
> First:
> Why the need for such a unit?
Primarily compatibility, but there are reasons why it is a good thing.

Two fold.

- Non LCL libraries (like e.g. FMX or a clone)  might use them, since 
that is why Delphi did it.

- Less specific for the enumerations, but having e.g. the Tcolor(rec) 
related stuff in LCL unit was a pain, as e.g. FCL-image needed it for 
non visual image manipulation

> Second:
> Given the fact that enumerations like TOpenOption etc. are related to
> GUI applications, why does this unit "reside" in fpc and not in
> Lazarus?
>
So, compatibility.  The pain is now a bit harder since the unit pretty 
much got filled up in a long release hiatus. But let's assume that that 
is temporary.