Looking to the message text it seems that you cannot attach a widget
already attached a second time.
Then the solution would be one of those two:
1) Create a menu bar widget inside the canvas view class and attach that
widget to the table.
2) Attach the menu bar at the toolbox (one time only) and update it every
time a canvas view instance is focused.
The correct way would be the second one for a simple window interface but
it would be more complex. I think the first one is easier at this moment
and the second solution can be addressed later.
Notice that you cannot focus two canvas view simultaneously so the second
solution is the correct one, I think.
To do the solution 1 you need to add a Gtk:: MenuBar member to the
CanvasView class constructed from the menu structure.
I hope it helps.
Carlos
El 18/01/2013 20:48, "Carlos López González" <[email protected]> escribió:
> Hi Yu!
>
>
>
> 2013/1/18 Yu Chen <[email protected]>
>
>> Hi Carlos，
>>
>> Hope you are getting better.
>>
>> I just pushed initial code[1] for implementation of standard menubar for
>> canvas window:
>>
>> 1) add a gtkmm standard menubar for canvas window,
>> 2) cleanup the code for further development
>> 3) add stock icons for some menu item
>>
>>
>> The curent questions need your help:
>>
>> 1) when new canvas instant created, the menu lost with a message:
>> (synfigstudio:6046): Gtk-CRITICAL **: IA__gtk_table_attach: assertion
>> `child->parent == NULL' failed
>>
> Apart of that message :
> (synfigstudio:44990): Gtk-CRITICAL **: void gtk_table_attach(GtkTable *,
> GtkWidget *, guint, guint, guint, guint, GtkAttachOptions,
> GtkAttachOptions, guint, guint): assertion `child->parent == NULL' failed
>
> I also have other warning when close the instance that has menu:
> (synfigstudio:44990): Gtk-CRITICAL **: void
> gtk_ui_manager_remove_action_group(GtkUIManager *, GtkActionGroup *):
> assertion `g_list_find (self->private_data->action_groups, action_group) !=
> NULL' failed
>
> And also, when close the document that doesn't have the menu I have lots
> of:
> (synfigstudio:44990): Gtk-CRITICAL **: void
> gtk_container_remove(GtkContainer *, GtkWidget *): assertion
> `GTK_IS_CONTAINER (container)' failed
>
> (synfigstudio:44990): Gtk-CRITICAL **: void
> gtk_container_foreach(GtkContainer *, GtkCallback, gpointer): assertion
> `GTK_IS_CONTAINER (container)' failed
>
> I'm researching about it.
>
>
>
>> 2) I found the actions are staying in two source files, app.cpp and
>> canvasview.cpp. In canvasview.cpp, there is a function named init_menus(),
>> in it, there are a lot of menu actions defined, my question is should we
>> move these definitions into app.cpp?
>>
>>
>> Just take your time, at the same time, I am still digging the code. ^__^
>>
>> [1] https://github.com/jcome/synfig/commits/menubar_toolbar
>>
>>
>> Cheers!
>>
>> ~ yu
>>
>> --
>> No one will come, Yu has to make it happen by Yu-self.
>>
>
>
>
> --
> Carlos
> http://synfig.org
>
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