Hi Dominik et al, This post follows on from the previous "ModuleListenOnly command" which was getting a bit off-topic.
> > As a hack/compromise, maybe we could modify AddToFunc to keep track > > of whether or not it uses a "mouse modifier" & only then grab the > > X server, in execute_complex_function(). > > We discussed this a couple of years ago, and Olivier(?) suggested > to allow functions without grabbing. The problem is that it is > generally unpredictable which functions need to grab and which do > not, and you can't do it on the fly because its too late then. I see. I read the thread (posted by Thomas) & now I understand that the grab is necessary for more than just the use of mouse modifiers, & I agree that it's near-impossible to calculate in advance whether we need to do a grab before we execute a complex function. As an author of complex functions, though, I sometimes know I do _not_ want FVWM to perform a grab when it executes my complex function. Would anyone be adverse to allowing the user to specify when they do not want a grab to be performed? Dan suggested something like this in: http://www.mail-archive.com/fvwm@lists.math.uh.edu/msg10120.html I'm not so keen on adding 'Grab' & 'Ungrab' builtin commands. (It's not too hard to image novice users regularly causing FVWM to freeze, through misuse of such commands.) But I like the idea of specifying a function as being "NoGrab". Dan proposed "FunctionNoGrab FUNCNAME". Another way to do it would be: AddToFunc MyFunc NoGrab I Echo hello + I Echo world but I think this a bit unintuitive/hackish. Instead, I propose adding a separate builtin command, "DefineFunc": DefineFunc MyFunc NoGrab + I Echo hello + I Echo world DefineFunc would behave much like AddToFunc except for 3 differences: 1. It would generate a warning message if the function already existed. 2. It would _not_ accept an action. 3. It would accept a list of _optional_ "function options". To start with, the only option would be "NoGrab". We could actually modify AddToFunc in this way, but (2) is a rather significant interface change & could upset a lot of users. Note that use of DefineFunc wouldn't be mandatory (though we could easily detect if it wasn't used & generate a "deprecated" warning if we wanted to) & it doesn't change the behaviour of existing configs. (ie. functions defined soley using "AddToFunc") What do you think? SCoTT. :)
