[Lazarus] Lcl to XWin questions

[SteveG]

Thanks Mattias - will begin further info hunting with this

> Zitat von SteveG <steveg at nevets.com.au>:
>
>   
>> Evening all (or as your timezone requires)
>>
>> I have a Windows library of functions being converted to Linux
>> equivalents (slowly) - but a few things are losing me on the way
>>
>> Win function: EnumWindows and EnumChildWindows return all window handles
>> and children as used directly by the LCL.
>>  xQueryTree in Lin returns TWindow pointers, which are not direct
>> handles to the window.
>>  How do I determine the actual window handle from the TWindow returned,
>> and will this also allow me to find the 'name' of the window / control,
>> not just the Title.
>>  If I use GDK_WINDOW_XWINDOW(
>> PGdkWindowPrivate(GTK_WIDGET(WinHandle)^.window)) on a window 'handle'
>> passed from the LCL, it gives me the
>>  TWindow pointer associated, but seems to be the top level window for
>> the project, not a pointer the 'control' itself (I think)
>>     
>
> The gtk does not create for every widget a window. That means some childs share
> their parent xwindow.
> The gtk2 has reduced that even further. Almost all childs share their parent
> xwindow.
>
>
>   
>>  I am working on the assumption that each window/control
>> (forms/buttons/etc) are TWindows ? -
>>  If not, how do I enum the windows/controls associated with a specific
>> TWindow and determine the 'controls' window handle and name ?
>>     
>
> The LCL has a tree structure, and the gtk as well. Basically for each LCL
> control there can be several gtk widgets. Both trees can be used to traverse.
>
>
>   
>> To summarize:
>>  Under Linux I would like to enumerate all open windows and their
>> children, gathering 'actual' window handles, and control names (to be
>> used within the LCL).
>>
>> :and just as an extra :)
>> Win function: WindowFromPoint(Point :TPoint) returns the handle of the
>> window at x,y of Point
>>   Is there a Lin equiv ? - xQueryPointer seems close, but only returns
>> window at curr cursor position
>>     
>
> See FindLCLWindow, FindLCLControl, FindOwnerControl.
>
>
>   
>> any suggestions really appreciated. (really)
>>     
>
> Keep in mind, that your code will rely on gtk and LCL internals, which are not
> supported, and can change any time without announcement.
>
>
> Mattias
>
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