[GTK4][C] How should actions connect with menu items?

Question

I'm making an application using GTK4 in C language. I'm trying to connect some actions with menu items but such items are inactive, i.e., they are not clickable while they appear. I don't know a way to solve this problem so any help are appreciated.

A part of code is below.

#include <gtk/gtk.h>

int main(int argc, char **argv)
{
    int status;
    
    application = gtk_application_new("gtk.example", G_APPLICATION_FLAGS_NONE);
    g_signal_connect_swapped(application, "active" G_CALL_BACK(create_window), application);

    status = g_application_run(G_APPLICATION(application),argc,argv);
    g_object_unref(application);
    return status;
}

void create_window(GtkApplication *application)
{
    GMenu *menubar;
    GMenu *menu;
    GMenuItem *item;

    window = gtk_application_window_new(application);
    gtk_window_set_application(GTK_WINDOW(window),application);
    
    const GActionEntry entries[] =
    {
        {"close", quit}
    };
    g_action_map_add_action_entries(G_ACTION_MAP(application), entries, G_N_ELEMENTS(entries),NULL);

    menubar = g_menu_new();
    menu = g_menu_new();
    item = g_menu_item_new("Close", "app.close");
    g_menu_append_item(menu,item);
    g_object_unref(item);
    
    g_menu_append_submenu(menubar, "File", G_MENU_MODEL(menu));
    g_object_unref(menu);

    gtk_application_set_menubar(application, G_MENU_MODEL(menubar));
    gtk_application_window_set_show_menubar(GTK_APPLICATION_WINDOW(window),TRUE);
    gtk_window_present(GTK_WINDOW(window));        
}

static void quit(GSimpleAction *action, GVariant *parameter, gpointer data)
{
    g_print("You choose close action\n");
}

The result I got is below. Close is not clickable.

Michi · Answer 1 · 2021-07-27T15:00:57.473

There are so many problems with your code, that I have no Idea where I should start with.

Anyway, the main problem (but not the only one) it is here:

const GActionEntry entries[] =
{
    {"close", quit}
};

It should be like this:

const GActionEntry entries[] =
{
    {"close", quit, NULL, NULL, NULL, { 0, 0, 0 } }
};

Here is a working program:

#include <gtk/gtk.h>

void create_window ( GtkApplication *application );
static void quit   ( GSimpleAction *action, GVariant *parameter, gpointer data );

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

    /// ***
    application = gtk_application_new ( "gtk.example", G_APPLICATION_FLAGS_NONE );
    g_signal_connect_swapped ( application, "activate", G_CALLBACK ( create_window ), application );

    /// ***
    status = g_application_run ( G_APPLICATION ( application ), argc, argv );
    g_object_unref ( application );
    
    return status;
}

void create_window ( GtkApplication *application )
{
    GtkWidget *window;
    GMenu *menubar;
    GMenu *menu;
    GMenuItem *item;

    /// ***
    window = gtk_application_window_new ( application );
    gtk_window_set_application ( GTK_WINDOW ( window ), application );

    /// ***
    const GActionEntry entries[] =
    {
        {"close", quit, NULL, NULL, NULL, { 0, 0, 0 } }
    };
    
    /// **
    g_action_map_add_action_entries ( G_ACTION_MAP ( application ), entries, G_N_ELEMENTS ( entries ), NULL );

    /// ***
    menubar = g_menu_new();
    menu    = g_menu_new();
    item    = g_menu_item_new ( "Close", "app.close" );
    
    /// ***
    g_menu_append_item ( menu, item );
    g_object_unref ( item );

    /// ***
    g_menu_append_submenu ( menubar, "File", G_MENU_MODEL ( menu ) );
    g_object_unref ( menu );

    /// ***
    gtk_application_set_menubar ( application, G_MENU_MODEL ( menubar ) );
    gtk_application_window_set_show_menubar ( GTK_APPLICATION_WINDOW ( window ), TRUE );
    
    /// ***
    gtk_window_present ( GTK_WINDOW ( window ) );
}

static void quit ( GSimpleAction *action, G_GNUC_UNUSED GVariant *parameter, G_GNUC_UNUSED gpointer data )
{
    g_print ( "You choose `%s` action\n", g_action_get_name ( G_ACTION( action ) ) );
}

I am strongly suggesting you to check these Videos.

By the way, there is not active Signal, you need activate instead.

OK, my question is how to display the accelarator key combination? For example in your code for Close it would be like CTRL + Q — Joel, May 31 '22 at 02:21
For anyone wondering, the `{ 0, 0, 0 }` as the final component of a `GActionEntry` is for its private `padding` field. It just avoids warnings when using strict compiler settings. See: https://stackoverflow.com/a/27539131/9959012 — 6equj5, Aug 03 '22 at 02:23

[GTK4][C] How should actions connect with menu items?

1 Answers1