[compiz] Relative position between two windows

[Sam Spilsbury]

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
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>
>
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