GTK IM switch by software keyboard

["Bin Chen" <binary chen gmail com>]

Hi,

I have ported a new GTK input method module to my platform, the
regular steps to switch input method in a GTK+ text widget is to right
click the entry point and select the desired input method.

Now I want to do all this more simpler, I want to add a button in the
software keyboard or a hardware keyboard, when press the button, the
GTK+ input method will switch in a round-robin scheme. Is it possible?

Thanks.
Bin