[Lazarus] Linux Window Handles

[SteveG]

Thanks Graeme
I will see if I can find how to convert from GTK to LCL handles (your 
theory sounds good)
I have been waiting for fpGUI to be stable enough to use anyway (from 
the LCL point of view),
so this issue may be a null point soon anyway for me.

'xwininfo' does indeed find the 'main' window, but I am calling 
'xquerytree' to get a list of windows
and children (using xwininfo just for testing), and dont seem to be able 
to find how to determine which is the 'main' from the returned data 
(seem to be a lot of 'no name' windows in the tree - many at the top level)

Graeme Geldenhuys wrote:
> On Sun, Aug 3, 2008 at 6:37 AM, SteveG <steveg at nevets.com.au> wrote:
>   
>> Having a problem understanding the usage of window handles in Linux
>>
>> Linux (Ubuntu 8.04):
>> I can find no correlation between the Laz supplied window handle
>> (Form1.Handle), and the X11 required handle - found using 'xwininfo -int
>> -tree' (and clicking on Form1 of testapp)
>> As an example, Laz returned 138531872, xwininfo returned 62915166.
>>     
>
> I think the following is true, but I might be wrong. Due to the fact
> that LCL doesn't talk directly to XLib (unlike fpGUI), it returns some
> GTK object handle. I guess you need to find a way to convert or query
> the actual X11 handle from that GTK object handle. This is just a
> guess.
>
>   
>> As an aside to this, how do I determine the 'main/important' window
>> handle from the list returned by
>>     
>
> I simply use "xwininfo -tree" and gives me the following results,
> after I clicked on the window I am interested in.
>
> ----------------------[ start ]------------------------------
> graemeg at graemeg-laptop:~$ xwininfo -tree
>
> xwininfo: Please select the window about which you
>           would like information by clicking the
>           mouse in that window.
>
> xwininfo: Window id: 0x2e000a4 "Vodafone Mobile Connect Card driver for Linux"
>
>   Root window id: 0x5b (the root window) (has no name)
>   Parent window id: 0x100013d (has no name)
>      25 children:
>      0x2e000fd (has no name): ()  578x15+2+468  +1305+1150
>      0x2e000fc (has no name): ()  15x3+583+462  +1886+1144
>      0x2e000f5 (has no name): ()  576x1+3+463  +1306+1145
>         1 child:
>         0x2e000f6 (has no name): ()  566x1+5+5  +1311+1150
>            1 child:
>            0x2e000f7 (has no name): ()  566x1+0+0  +1311+1150
>      0x2e000f4 (has no name): ()  600x27+0+433  +1303+1115
>      0x2e000f3 (has no name): ()  168x87+416+307  +1719+989
>      0x2e000d8 (has no name): ()  168x87+242+307  +1545+989
> <...snip....>
> ------------[  end  ]-----------------
>
> Now that clearly shows the root id (desktop or Root window id: 0x5b)
> and the main window I clicked on (Parent window id: 0x100013d) and
> then it's 25 children with their positions.
>
>
> Regards,
>  - Graeme -
>
>
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