[compiz] Relative position between two windows

[Luca Rocca]

Hi Sam,

thank you for your answer. I have compiz 0.8.4 and there is a "Lazy
Positioning" option
in the "Move Window" plugin settings page. It was on by default and turning
it off solved
the problem! Now a window follows continuosly the changes of the other.
Wunderbar.
One thing more, however, which seems strange to me.
In case of a resize the movement of the "linked " window is perfectly
smooth. But
in case of a move the movement is jerky, the window shivers and there is a
noticeable
spring effect i.e. there is a visible delay in the movement response. It
seems strange to me
because there aren't two different code paths for the two cases, the code
is perfectly the
same. I get a ConfigureNotify event, and on the basis of the new window
position/geometry
move the other, regardless of the type of the generating event (move or
resize).
May be that in the two cases compiz generates configure notifications
differently?
A huge thanks,

Luca




2013/6/19 Sam Spilsbury <smspillaz at gmail.com>

> Hi Luca,
>
> In recent versions of compiz (0.9.10) if you have lazy positioning on
> (org.compiz.move 'lazy-positioning') other clients won't get a configure
> notification until the end of the move.
>
> This is a performance optimization to avoid a slow path on the nvidia
> drivers with vsync.
>
> If you want such notifications you need to turn this option off. Either
> that or implement this as a compiz plugin so that you can get move
> notifications in real time.
>
> Sam.
> On 19/06/2013 1:57 PM, "Luca Rocca" <disquisitiones at gmail.com> wrote:
>
>> Hi,
>> I'm Luca from Savona, Italy.
>> I'm using Compiz and I'm writing an application with Xlib to draw two
>> windows,
>> let's say window_A and window_B. I would like to keep fixed the relative
>> position
>> between two established corners of them that they have when mapped.
>> So that if I move or resize one of the window, the other if necessary
>> automatically
>> moves to observe the condition. I'm close with this code, let's see for
>> example
>> the case for window A:
>>
>> XSelectInput ( display, RootWindow ( display, 0 ), SubstructureNotifyMask
>>> );
>>>
>>> XEvent event;
>>> while ( true )
>>> {
>>>     XNextEvent ( display, & event );
>>>     /* ... */
>>>     if ( event.type == ConfigureNotify and event.xconfigure.window ==
>>> window_B )
>>>     {
>>>         // new_x, new_y based on event.xconfigure.x, event.xconfigure.y,
>>> etc...
>>>         XMoveWindow ( display, window_A, new_x, new_y );
>>>     }
>>>     /* ... */
>>> }
>>>
>>
>> The problem is that the move correction of a window is only applied at
>> the end of the move/resize
>> operation of the other and not continuously during it.
>> Is there a way to obtain this as if the two windows could behave like one
>> rigid body?
>> Thank you in advance,
>>
>> Luca
>> _______________________________________________
>> compiz mailing list
>> compiz at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/compiz
>>
>>
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