Test GtkIMContext in gtk+2.0

test_imcontext.c

#include <stdio.h>
#include <gtk/gtk.h>

static gboolean focus_callback(GtkWidget *gtk_window,
                               GdkEvent *event,
                               GtkIMContext *im_context) {
  gtk_widget_grab_focus(gtk_window);
  gtk_im_context_focus_in(im_context);
  gtk_im_context_reset(im_context);
  return TRUE;
}

static gboolean blur_callback(GtkWidget *widget,
                              GdkEvent *event,
                              GtkIMContext *im_context) {
  gtk_im_context_focus_out(im_context);
  return TRUE;
}

static void commit_callback(GtkIMContext *context,
                            const gchar *str,
                            gpointer data) {
  printf("commit_callback: %s\n.", str);
}

static void preedit_changed_callback(GtkIMContext *context,
                                     gpointer data) {
  printf("preedit_changed_callback.\n");
}

static gboolean retrieve_surrounding_callback(GtkIMContext *context,
                                              gpointer data) {
  printf("retrieve_surrounding_callback.\n");
  return TRUE;
}

static gboolean delete_surrounding_callback(GtkIMContext *context,
                                            gint offset,
                                            gint n_chars,
                                            gpointer data) {
  printf("delete_surrounding_callback.\n");
  return TRUE;
}

int main(int argc, char *argv[]) {
  GtkWidget *gtk_window;
  GtkIMContext *im_context;
  GdkWindow *gdk_window;

  gtk_init(&argc, &argv);

  gtk_window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  gtk_widget_show(gtk_window);
  g_signal_connect(GTK_WINDOW(gtk_window), "destroy",
      G_CALLBACK(gtk_main_quit), NULL);

  im_context = gtk_im_multicontext_new();
  gdk_window = gtk_widget_get_window(GTK_WIDGET(gtk_window));
  gtk_im_context_set_client_window(im_context, gdk_window);

  g_signal_connect(gtk_window, "focus-in-event",
      G_CALLBACK(focus_callback), im_context);
  g_signal_connect(gtk_window, "focus-out-event",
      G_CALLBACK(blur_callback), im_context);

  g_signal_connect(im_context, "commit",
      G_CALLBACK(commit_callback), NULL);
  g_signal_connect(im_context, "preedit-changed",
      G_CALLBACK(preedit_changed_callback), NULL);
  g_signal_connect(im_context, "retrieve-surrounding",
      G_CALLBACK(retrieve_surrounding_callback), NULL);
  g_signal_connect(im_context, "delete-surrounding",
      G_CALLBACK(delete_surrounding_callback), NULL);

  gtk_main();
  return 0;
}