Hi Stan, Not sure I have anything useful to offer at all. But that has never stopped me in the past, so here goes anyway...
On 10 Oct 2009, at 18:57, [email protected] wrote: > Now, when "View" is clicked, and the list of files comes into > view, I'd like to be able to deactivate the ones that don't > exist (or cannot be opened). I thought I might do that by checking > the file status in the callback for the top level menu item, but > it seems that the callback is invoked not when the item is clicked, > but when the sub menu is "closed," either by selecting from it > or by clicking the top level item again. That's too late :) Yup. Tricky... I thought you could hook the CB when the menu was shown, but I just tried and it looks very much as of you are right... OK, here's a nasty idea: make your own menu subclass, and (somehow I haven't thought through yet) hook the draw method that exposes the menu to trigger your file checks? > I guess I'm looking for the moral equivalent of when() for > menu items. Any ideas on how I might go about this would be > appreciated. My best guess (so far) as above... > Using fltk 1.1.8 on XP at the moment. Hey! You are exactly the sort of guy we want/need to be trying out the 1.1.10 rc... > The > following bare bones example is illustrative, I hope. Yup. > char const* const filename = "strategy.log"; const correctness does my head in. I think I'd write that as "const char* const" to stop the two consts cuddling up like that - but maybe that means something different? > void > Window::view_cb() > { > int fd = open(filename, O_RDONLY); > if(fd >= 0) { > filename_->activate(); > close(fd); > } > else { > filename_->deactivate(); > } > } I think I'd be tempted to use "access" or maybe even "stat" here, for fear that (on some platform) attempting to open a non-existent file would create it...? My other idea was to only populate the menu with the names of the files found in each subdir (rather than starting with a list then marking each entry active/inactive) but I guess that suffers from the same problem about how to trigger that action... Also, I guess you are doing something like a "Recent Files" list and you want to mark which ones are still present...? Cheers, -- Ian _______________________________________________ fltk mailing list [email protected] http://lists.easysw.com/mailman/listinfo/fltk
