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I does not mean shortcuts, for example, I want to write a screen keyboard, so the buttons must respond to the key events. When I press "k" on the real keyborad, one button "k" in the window must act just like been pressed.
Or write a digital calculator, when I press a number key, the button in the window must also "been pressed" at the same time.
For example, pressing "k" would call gtk_buttom_pressed() associated with the buttom, and releasing "k" would call gtk_buttom_released(). I think, this should model the effect, you want. An even more simple way seems to use gtk_buttom_clicked().
However, I'm not very familar with C, so consider this a suggestion.