Re: proposal for a smarter behavior for raising windows on mouse click

[Bill Haneman <Bill Haneman Sun COM>]

John Harper wrote:

> On Jan 27, 2004, at 12:19 PM, Lubos Lunak wrote:
>
> > On Tuesday 27 of January 2004 21:01, John Harper wrote:
> >
> > > sawfish implements something similar, it has a  
> > > _SAWFISH_WM_RAISE_WINDOW
> > > wm protocol. When windows advertise they support it, user-initiated
> > > window raises are redirected to the client window, similar to how
> > > WM_TAKE_FOCUS works
> > >
> > > The motivation for adding this was to do drag and drop correctly in
> > > nautilus (the version based on gtk 1.x). However, getting things to
> > > work correctly was fraught with race conditions, so something more
> > > under wm-control may be better..
> >
> >
> >  Could you please list the problems? I think I can already see some 
> > of  them,
> > but you have had the personal experience ;), so you know them all.  
> > That'd
> > certainly help to find out how to do it better.
>
>
> the nautilus code has some comments describing some of the issues I 
> ran  into:
>
> http://cvs.gnome.org/bonsai/cvsblame.cgi?file=nautilus%2Flibnautilus- 
> extensions%2FAttic/nautilus-drag-window.c&rev=&root=/cvs/gnome
>
> I think the main thing was that the code worked by receiving the  
> raise-window message, then waiting a period of time for a  
> button-release event, but there were cases when the button-release  
> event never arrived. Also, there were problems with making sure the  
> correct timestamp got passed when actually focusing/raising the 
> window  (e.g. you really want XRaiseWindow to take a timestamp like  
> XSetInputFocus does) 

The timing-based behavior is likely to run into problems with race 
conditions and also accessibility problems.  I shudder at the thought of 
anything in the window manager (besides perhaps alert beeps/flashes) 
relying on timeout periods.

- Bill

>     John
>
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