Re: How to create Gnome-3 style application menu?

[Phil Wolff <adiabat centurylink net>]

There's a working example at 
https://github.com/GNOME/gtkmm-documentation/tree/master/examples/book/application/app_and_win_menus.

On 08/02/2015 02:01 PM, Gerardo Ballabio wrote:
> Hello all,
>
> I'm trying to learn how to build a gtkmm application that conforms to 
> Gnome 3 style guidelines.
>
> In particular I want to create a custom application menu (the menu 
> that pops up when you click the application name in the Gnome 3 top 
> bar). As far as I can see, the gtkmm tutorial (chapter 12) only shows 
> how to create a Gnome 2-style menubar.
>
> Reading the gtkmm 3 API reference I figured I should use 
> Gtk::Application::set_app_menu() and wrote the attached sample file, 
> but it doesn't seem to work: when I run it, it shows the fallback 
> application menu that gets generated when no menu has been set, that 
> is, with a single "Quit" entry (see attached screenshot).
>
> I'm running my test program in Gnome 3 in Debian 8 (gtkmm version 
> 3.14.0), so application menus should definitely be supported. Indeed 
> app->prefers_app_menu() returns true, and Gnome programs such as Web 
> do show their application menus.
>
> Can you please help me find what I'm doing wrong?
>
> The documentation says set_app_menu() should be called after the 
> application has been registered and that 
> "Application::signal_startup() is a good place [to do that]". Indeed I 
> tried to call set_app_menu() in the main function before running 
> app->run(window), but then I get this error message:
>
> (menus:1997): Gtk-CRITICAL **: gtk_application_set_app_menu: assertion 
> 'g_application_get_is_registered (G_APPLICATION (application))' failed
>
> So I connected a callback to app->signal_startup() and called it from 
> there (I considered also subclassing Gtk::Application, but because it 
> has no public constructor and gets instantiated via a static create() 
> method, I don't think I can or should do that). Then I get no error, 
> but no menu either.
>
> I guess the Gio::Menu instance that I'm building may not be adequate, 
> but in the documentation I couldn't find any guidance on how to build 
> it. The procedure described in the tutorial to build menus doesn't 
> create a Gio::Menu and doesn't seem applicable here (or is it?).
>
> Any help will be much appreciated. (A working example would be VERY 
> much appreciated.)
>
> Thanks
>  Gerardo
>
>
>
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