[Lazarus] TWinControl.AddControl?

[Hans-Peter Diettrich]

Paul Ishenin schrieb:
> 21.10.2011 5:39, Hans-Peter Diettrich wrote:
>> What's the purpose and action of TWinControl.AddControl?
>>
>> The source code comment suggests
>> Add Handle object to *parents* Handle object.
>> but the code invokes
>> TWSControlClass(WidgetSetClass).AddControl(Self);
>> with no Parent involved!
>>
>> Can somebody explain that?
> 
> Well, Parent and Parent Handle are different. Parent is about LCL/VCL 
> TControl property and Parent Handle is about widgetset window object 
> like a call to SetParent(hWndChild, hWndParent: HWND): HWND.

Right, but what's the purpose of AddControl, then?

Does it tell the widget to associate itself with the given control?
Or does the widgetset obtain the associated widget from the LCL 
control.Handle, and then does what?

We also can postpone this question, until the widgetset interface is 
documented. For now it may be sufficient to document AddControl as
"Call this method when <what reason or purpose?>".

DoDi