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I have successfully manage to add an accelerator to a menu item with the gtk_widget_add_accelerator() function.

What bothers me is how i can add a custom accelerator that widget.With the first command i can add a shortcut like "Ctrl + A"; but what happens if i want to use the "Up" arrow key or F1 as an accelerator?

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You will probably need to implement this using your own handler. However, I recommend you to ask on, as this programming question is barely related to Ubuntu itself. – Rafał Cieślak Jun 28 '12 at 18:00
I agree that stackoverflow is a better place to ask,on the other hand i am aware that questions regarding application development on ubuntu are valid,so i guess it's not offtopic. – Rrjrjtlokrthjji Jun 28 '12 at 18:06
up vote 0 down vote accepted

I managed to replace "Ctrl + something" with "something" itself.

That can be done simply by setting the value of GdkModifierType, which is the second from last parameter,to zero.

For instance:

gtk_widget_add_accelerator(menu_item.fullscreen, "activate", accel_group, 

This will display F11 instead of Ctrl + F11.

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