Este ComboBox imprime en la terminal cuando cambia su selección.
#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;
}
En este ejemplo se usa lo siguiente:
GtkApplication
GtkWindow
GtkComboBoxText