GTK+ is a system that relies on signals and callback functions. A signal is a notification to your application that the user has performed some action. When a signal is emitted, you can tell GTK+ to run a function named a callback function.

To connect a signal, you can use g_signal_connect(). This function accepts four parameters. The first is the GObject you are watching for the signal. The signal_name is a string representing the signal; a list of signal names can be found in the tables throughout this appendix.

gulong g_signal_connect (gpointer object,                          const gchar *signal_name,                          GCallback handler,                          gpointer data);

The third parameter is the name ...

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