How to maintain relative position of two surfaces?

[Jasper St. Pierre]

This sounds like you want to use subsurfaces, then.

Any reason you can't just draw the child surface on top of the father
surface, though?

On Wed, Sep 24, 2014 at 6:16 PM, Hongze Zhao <zhaohongze at gmail.com> wrote:

> Hi Jasper,
>
> Thanks for reply.
>
> Here is my use case.
>
> Suppose we have a client called "father", who has a larger surface called
> "father surface" and a client called "child", whose smaller surface is
> "child surface". The child surface should be displayed in a given relative
> position above father surface and maintain their relative position. When I
> move father surface, the child surface will be moved together. But the
> child surface cannot be moved. Thus the child surface will looks like a
> part of father surface. I just need it works in the simplest scenario. I
> assume the two surfaces is in the same workspace, both surfaces cannot be
> resized, maximized or fullscreened. The two clients and compositor should
> work together to achieve this goal.
>
> I know this is a weird use case. I am just wondering if there is some
> natural or easy way to implement this functionality. Or I have to do a lot
> of modifications.
>
> Thanks,
> Hongze
>
>
> On Wed, Sep 24, 2014 at 7:54 PM, Jasper St. Pierre <jstpierre at mecheye.net>
> wrote:
>
>> The only way to position surfaces relatively one to another is by using a
>> subsurface. But I imagine this isn't exactly what you want.
>>
>> Can you explain a bit more about your use case? What happens if I put one
>> surface on a different workspace from the others? Should the two be stacked
>> independently (e.g. your window A, my terminal, your window B)? What
>> happens when I resize the surfaces? Or maximize or fullscreen them?
>>
>> On Wed, Sep 24, 2014 at 5:49 PM, Hongze Zhao <zhaohongze at gmail.com>
>> wrote:
>>
>>> Hi All,
>>>
>>> I am doing some experiments on weston compositor. I am wondering if
>>> someone could give me some hints about how to maintain relative position of
>>> two surfaces.
>>>
>>> Suppose I have two wayland clients. After I grab and move the surface of
>>> one client, I would like to maintain the relative positions of the the
>>> surfaces from two clients. Thus I have to automatically update the position
>>> of the other surface.
>>>
>>> I feel that surface position is stored in an instance of weston_view,
>>> which is mainly maintained by desktop-shell. So I am not sure if there is
>>> some easy way to achieve my goal by modifying desktop-shell.
>>>
>>> Thanks,
>>> Hongze
>>>
>>> _______________________________________________
>>> wayland-devel mailing list
>>> wayland-devel at lists.freedesktop.org
>>> http://lists.freedesktop.org/mailman/listinfo/wayland-devel
>>>
>>>
>>
>>
>> --
>>   Jasper
>>
>
>
>
> --
> Hongze Zhao
> Department of Computer Science
> Duke University
> Email: zhaohongze at gmail.com
>



-- 
  Jasper
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