[Lazarus] Linux Window Handles

[SteveG]

So far I have found that Laz uses a Gtk pointer to a structure rather 
than a window handle directly.
Anybody know what type of structure (and where to find it) ?

SteveG wrote:
> 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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>>   
>>     
>
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