Re: frame size hints

[Sasha Vasko <sasha aftercode net>]

Dominik Vogt wrote:
> On Mon, Dec 02, 2002 at 09:56:45AM -0600, Sasha Vasko wrote:

> > Say, when cliends needs that - it sends a message to WM requesting this 
> > information, and the WM upon receiving such message - calculates 
> > withdrawn position of the window, and sets a property on this window with :
> >
> > X, Y, WIDTH, HEIGHT, BORDER_WIDTH and GRAVITY,
> >
> > of such withdrawn position.
>
>
> Problem:  when the client receives the information, it may already
> have changed.  I see no easy way around this race condition.

For the purpose of serialization - this is not relevant.

> > Also whenever WM receives UnmapNotify 
> > signaling that client withdraws its window - it should set such property 
> > on client window anyway. Surely cliend could of queried its withdrawn 
> > position by using XGetGeometry, but there is one essential piece of info 
> > that could not be obtained that way - gravity value that has been used 
> > by WM to position the window.
>
>
> Well, but the client should know which gravity it requested
> initially.  No need to ask the window manager.

Window manager may disregard requested gravity and use something else 
instead - based on its own config, or some some heuristics like:
"If client is XV then screw its hints and always use static gravity 
instead" :)

> > Having above all this information about its withdrawn position, any 
> > clien could safely restore its position in future to the closest 
> > possible approximation, without concerning itself about WM frames, frame 
> > size, and any other external information, by simply setting its position 
> > prior to being mapped and using appropriate gravity in hints.
>
>
> Yes, that should work.
>
> Bye
>
> Dominik ^_^  ^_^

Sasha