GTK3 keyboard sample

gtk3-input.c

// build:
// gcc gtk3-entry-keyboard-event.c `pkg-config --cflags gtk+-3.0` `pkg-config
// --libs gtk+-3.0`

#include <gtk/gtk.h>

static gboolean print_keypress(GtkWidget *widget, GdkEventKey *event,
                               gpointer user_data) {
  printf("keypress: %#06x %#06x\n", event->keyval, event->hardware_keycode);
  return FALSE;
}

static gboolean print_keyrelease(GtkWidget *widget, GdkEventKey *event,
                                 gpointer user_data) {
  printf("keyrelesae: %#06x %#06x\n", event->keyval, event->hardware_keycode);
  return FALSE;
}

static void activate(GtkApplication *app, gpointer user_data) {
  GtkWidget *window;
  GtkWidget *entry;
  GtkWidget *grid;

  window = gtk_application_window_new(app);
  gtk_window_set_title(GTK_WINDOW(window), "Window");
  gtk_widget_add_events(window, GDK_KEY_PRESS_MASK);
  g_signal_connect(G_OBJECT(window), "key_press_event",
                   G_CALLBACK(print_keypress), "window");
  g_signal_connect(G_OBJECT(window), "key_release_event",
                   G_CALLBACK(print_keyrelease), "window");

  grid = gtk_grid_new();
  gtk_container_add(GTK_CONTAINER(window), grid);

  entry = gtk_entry_new();
  gtk_grid_attach(GTK_GRID(grid), entry, 0, 0, 1, 1);

  gtk_widget_show_all(window);
}

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

  app = gtk_application_new("org.example.keyboard", 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;
}