将函数连接到 GtkAction

Question

我正在尝试使用 C 编写 GTK+3 应用程序。

我创建了一个 glade 文件，其中包含一个 ID 为“tracks_deck.add_empty_track”的操作。

我将操作连接到工具栏项和菜单项。

问题是如何将函数连接到该操作？

我有以下 C 代码:

#include <gtk/gtk.h>
#define UI_FILE "tuxmusicstudio.glade" 
#define TOP_WINDOW "application_window"

int main (int argc, char *argv[])
{
GtkWidget *main_window;
GtkBuilder *builder;
GError *error = NULL;

GtkAction *action;

gtk_init (&argc, &argv);

builder = gtk_builder_new();
if (!gtk_builder_add_from_file(builder, UI_FILE, &error)) {
    g_critical("couldn't load builder file: %s",error->message);
    g_error_free(error);
}

/* create the main, top level, window */
main_window = GTK_WIDGET(gtk_builder_get_object(builder, TOP_WINDOW));
if (!main_window) {
    g_critical("widget \"%s\" is missing in file %s.",TOP_WINDOW,UI_FILE);
} 

action = GTK_ACTION(gtk_builder_get_object(builder, "tracks_deck.add_empty_track"));
if (!action) {
    g_critical("could not fetch action tracks_deck.empty_track");
}

 gtk_widget_show_all (main_window);

/* start the main loop, and let it rest there until the application is closed */
gtk_main ();

return 0;

如您所见，我正在尝试获取 GtkAction 以便将函数连接到它。编译器正在编译该行已弃用:

main.c:46:5: warning: ‘gtk_action_get_type’ is deprecated (declared at /usr/include/gtk-3.0/gtk/deprecated/gtkaction.h:87) [-Wdeprecated-declarations]
 action = GTK_ACTION(gtk_builder_get_object(builder, "tracks_deck.add_empty_track"));
 ^

那么我如何使用一些未弃用的函数获取 GtkAction。以及如何将 a c 函数连接到该操作？!

如有任何关于此问题的想法，我们将不胜感激。

Answer 1

来自 GtkAction

Description

In GTK+ 3.10, GtkAction has been deprecated. Use GAction instead, and associate actions with GtkActionable widgets. Use GMenuModel for creating menus with gtk_menu_new_from_model().

所以，似乎要走的路是从 GtkAction 切换到 GAction。

我见过从 gtk_something 到 g_something 的类似移动，例如gtk_signal_connect 和 g_signal_connect。

更新:

我四处搜索并没有真正找到好的示例或教程。我找到的唯一片段位于 g_action_map_add_action_entries。

static void
activate_quit (GSimpleAction *simple,
               GVariant      *parameter,
               gpointer       user_data)
{
  exit (0);
}

static void
activate_print_string (GSimpleAction *simple,
                       GVariant      *parameter,
                       gpointer       user_data)
{
  g_print ("%s\n", g_variant_get_string (parameter, NULL));
}

static GActionGroup *
create_action_group (void)
{
  const GActionEntry entries[] = {
    { "quit",         activate_quit              },
    { "print-string", activate_print_string, "s" }
  };
  GSimpleActionGroup *group;

  group = g_simple_action_group_new ();
  g_action_map_add_action_entries (G_ACTION_MAP (group), entries, G_N_ELEMENTS (entries), NULL);

  return G_ACTION_GROUP (group);
}

此示例使用 struct GActionEntry使用 g_action_map_add_action_entries 命名函数/ Action 并将其添加到 Action 组。