GTK Glade 无法连接信号处理程序

Question

我正在使用 GTK3。我已经设置了一个带有 glade 的 GUI 并跟踪了顶层的处理程序 window:

以及以下 main.c：

#include <gtk/gtk.h>

static gboolean on_wnd_delete_event(GtkWidget *widget, GdkEvent *event, gpointer data){
  g_print ("delete event occurred\n");
  return TRUE;
}

static void on_wnd_destroy(GtkWidget *widget, gpointer data){
  gtk_main_quit ();
}

int main(int argc, char *argv[]){
  GtkBuilder *gtkBuilder;
  GtkWidget  *window;

  gtk_init(&argc, &argv);
  gtkBuilder = gtk_builder_new();

  gtk_builder_add_from_file(gtkBuilder, "gui.glade", NULL);

  window = GTK_WIDGET(gtk_builder_get_object(gtkBuilder, "wnd"));

  gtk_builder_connect_signals(gtkBuilder, window);

  g_object_unref(G_OBJECT(gtkBuilder));
  gtk_widget_show(window);

  gtk_main();

  return 0;
}

编译时我收到警告：

main.c:3:13: warning: ‘on_wnd_delete_event’ defined but not used [-Wunused-function]
 static void on_wnd_delete_event(){
             ^
main.c:8:13: warning: ‘on_wnd_destroy’ defined but not used [-Wunused-function]
 static void on_wnd_destroy(){
             ^

并且在运行时，我定义的事件未被调用。

我做错了什么？

Answer 1

对于 gtk_builder_connect_signals，回调函数不能是静态的，因为 builder.c 文件需要访问它们。 ̣see here

也需要gtk_builder_connect_signals(gtkBuilder, NULL);而不是gtk_builder_connect_signals(gtkBuilder, window);。

Answer 2

您可以通过以下方式添加回调符号：

gtk_builder_add_callback_symbol 
        (gtkBuilder,
         "on_wnd_delete_event",
          G_CALLBACK(on_wnd_delete_event));

您也可以导出符号以使其可用，但是您必须按照此处所述更改编译标志：

GTK Glade 无法连接信号处理程序

GTK Glade can't connect signal handlers

c

gtk