[wx-dev] Commands in menus are always enabled

[Michael Hieke]

Yazhuk, Andrey (NIH/NLM/NCBI) [C] wrote:

>>> How about providing a fallback menu update handler (e.g. in the 
>>> application object) that always disables the menu item? So if no
>>> update event handler is provided, the command will be disabled.
> 
> I can probably do this, but it may be difficult to maintain these
> handlers.

I tried the same approach a few weeks ago, and it seems to work for me 
for wxMSW and wxGTK2 at least.  There is a problem with wxMAC (where it 
doesn't work at all ATM), but I already created a tracker item in SF bug 
tracker, assigned to Stefan C.

What I have is basically:

     void Application::OnUpdateUIDisable(wxUpdateUIEvent& event)
     {
         event.Enable(false);
     }

with dynamic connection of these event ids via

     Connect(wxID_LOWEST, wxID_HIGHEST, wxEVT_UPDATE_UI,
         wxUpdateUIEventHandler(Application::OnUpdateUIDisable));
     Connect(CmdIdFirst, CmdIdLast, wxEVT_UPDATE_UI,
         wxUpdateUIEventHandler(Application::OnUpdateUIDisable));

where CmdIdFirst to CmdIdLast is the range used for menu and toolbar 
command ids in my application.  Not much to maintain there, really.

Thanks

-- 
Michael Hieke