In GTK3, how do I get a DrawingArea to respond keyboard events?

In GTK3, how do I get a DrawingArea to respond keyboard events? Should I connect the DrawingArea with a signal or is it more compicated? I'm using GTK3 with the C language.

Solution

I fianlly found the solution here. I only connected the signal, but the GTK_CAN_FOCUS also need to be set for the drawingrea.

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