[Lazarus] Registering a TFrame to component palette

[Michael Van Canneyt]

On Sun, 13 Jun 2021, Sven Barth via lazarus wrote:

> Am 11.06.2021 um 23:48 schrieb Juha Manninen via lazarus:
>> Regarding issue : https://bugs.freepascal.org/view.php?id=28450 
>> <https://bugs.freepascal.org/view.php?id=28450>
>> 
>> The parameter passed to function RegisterComponents() is TComponentClass 
>> which means "class of TComponent". It is only type information and does not 
>> carry information about sub-components.
>> Could somebody please explain how it works in Delphi. Does this really work 
>> :
>>   RegisterComponents('Sample', [TMyFrame]);
>
> Yes, it does work this way. I don't know what you mean with "information 
> about sub-components". The VMT vFieldTable entry contains all published 
> fields of the class and thus all the sub controls that are visible through 
> the RTTI and thus for the designer. If the IDE does not use that yet, then it 
> definitly should.
>
>> I added a comment to the report but it is old and the reporter may not read 
>> it.
>> Maybe there should be a new function RegisterFrame() or similar?
>
> There is no need to add anything, because the necessary information is 
> already there. It's just that the IDE doesn't use it yet.

In Delphi, the above also does not work, you need special handling for
frames, just as for forms.

Michael.