On Sat, 17 Aug 2024, Kostas Michalopoulos via fpc-devel wrote:
On 8/16/24 8:40 PM, Michalis Kamburelis via fpc-devel wrote:
If we could instead just put TVector3 in the published section, and
make it exposed in the object inspector (maybe adding some additional
code to use RTTI, but that is made *once*, not every time we need to
expose TVector3) this would be great :)
Seconding this, for pretty much the same use case: my 3D game engine also
uses TVector, etc records (and objects! - stuff being allocated in stack or
"inline" other objects/classes is incredibly important) and needs to expose
them via RTTI/published and i have to use various kludgy hacks to work around
a language limitation that IMO was already questionable back in the 90s when
Delphi 2 was released (i might kinda accept it for Delphi 1 having to work in
16bit mode :-P).
Instead of having a proxy object, i "flatten" the fields using getters and
setters so, e.g., a "property Position: TVector read FPosition write
SetPosition" in the public section also has "property PositionX: Single read
GetPositionX write SetPositionX" and similar for PositionY and PositionZ.
Obviously with something like "property Transformation: TTransformation read
FTransformation write SetTransformation" which has Position, Rotation and
Scale properties (as TVectors) that get flattened to nine published
properties so they can be accessed via RTTI (and thus have automatic
serialization, deserialization, property editing UI, clipboard copy/paste,
undo/redo support via property diffs, etc without having to do all that
manually via code) it becomes kinda unwieldy fast.
Sadly i also do have to use proxy objects in some cases, e.g. i have a
generic object "TDynArray" for dynamic arrays which is wrapped via a
"TSerializableCollection" class so that the serialization/deserialization
code can automatically write/construct/read published collections of objects.
It'd be very useful if the Run-Time Type Information could describe all the
Type Information the compiler already knows about :-P
See my answer to Michalis: It is possible, but no streaming, so no published.
Michael.
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