# ComboBox (C)

Monica Kochofar
monicakochofar@gmail.com 2012
Tiffany Antopolski
tiffany.antopolski@gmail.com
A widget used to choose from a list of items
Rafael Ferreira
rafael.f.f1@gmail.com 2013

# ComboBox

This ComboBox prints to the terminal when you change your selection.

#include <gtk/gtk.h>

/* This is the callback function. It is a handler function which reacts to the * signal. In this case, if the row selected is not the first one of the * ComboBox, we write its value in the terminal for the user. */ static void on_changed (GtkComboBox *widget, gpointer user_data) { GtkComboBox *combo_box = widget;

if (gtk_combo_box_get_active (combo_box) != 0) { gchar *distro = gtk_combo_box_text_get_active_text (GTK_COMBO_BOX_TEXT(combo_box)); g_print ("You chose %s\n", distro); g_free (distro); }

}

static void activate (GtkApplication *app, gpointer user_data) { gint i; GtkWidget *view; GtkWidget *window; GtkWidget *combo_box;

/* Create a window with a title, border width, and a default size. Setting the * size to -1 means to use the "natural" default size. * (the size request of the window) */ window = gtk_application_window_new (app); gtk_window_set_title (GTK_WINDOW (window), "Welcome to GNOME"); gtk_window_set_default_size (GTK_WINDOW (window), 200, -1); gtk_container_set_border_width (GTK_CONTAINER (window), 10);

/* Create the combo box and append your string values to it. */ combo_box = gtk_combo_box_text_new (); const char *distros[] = {"Select distribution", "Fedora", "Mint", "Suse"};

/* G_N_ELEMENTS is a macro which determines the number of elements in an array.*/ for (i = 0; i < G_N_ELEMENTS (distros); i++){ gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo_box), distros[i]); }

/* Choose to set the first row as the active one by default, from the beginning */ gtk_combo_box_set_active (GTK_COMBO_BOX (combo_box), 0);

/* Connect the signal emitted when a row is selected to the appropriate * callback function. */ g_signal_connect (combo_box, "changed", G_CALLBACK (on_changed), NULL);

/* Add it to the window */ gtk_container_add (GTK_CONTAINER (window), combo_box);

gtk_widget_show_all (window); }

int main (int argc, char **argv) { GtkApplication *app; int status;

app = gtk_application_new ("org.gtk.example", G_APPLICATION_FLAGS_NONE); g_signal_connect (app, "activate", G_CALLBACK (activate), NULL); status = g_application_run (G_APPLICATION (app), argc, argv); g_object_unref (app);

return status; }

In this sample we used the following:

GtkApplication

GtkWindow

GtkComboBoxText