Callback will not set widget sentative

VarwigSoftware · **Joined:** Sat Mar 03, 2012 2:45 am **Posts:** 18

Hello Everyone,

I have a callback on a button that changes a notebook page and sets the menu bar and buttonbox sensitive to true. The Notebook changes pages but i can't get the set sensitive on the menubar and buttonbox. Any Ideas? I am using GTK3, Ubuntu 12.04.1, I get no error on compile and on the terminal.

main.c

Code:

#include <config.h>
#include <gtk/gtk.h>
#include <glib/gi18n.h>
#include "main.h"

GtkWidget *window;
GtkBuilder *builder;
GtkWidget *btn_login;
GtkWidget *menubar;
GtkWidget *buttonbox;
GtkWidget *notebook;

void btn_login_clicked_cb (GtkWidget *btn_login, gpointer data)
{
   menubar = _menubar ();
   buttonbox = _buttonbox ();
   notebook = _notebook ();
   
   gtk_widget_set_sensitive (GTK_WIDGET (menubar), TRUE);
   gtk_widget_set_sensitive (GTK_WIDGET (buttonbox), TRUE);
   gtk_notebook_set_current_page (GTK_NOTEBOOK (notebook), 1);
}

int main (int argc, char *argv[])
{

   gtk_init (&argc, &argv);

   window = _window ();
   gtk_widget_show_all (window);

   gtk_main ();

   return 0;
}

main.h

Code:

#include <config.h>
#include <gtk/gtk.h>
#include <glib/gi18n.h>


GtkWidget *window;
GtkBuilder *builder;
GtkWidget *btn_login;
GtkWidget *menubar;
GtkWidget *buttonbox;
GtkWidget *notebook;
GError* error = NULL;


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

void get_builder (void)
{
   builder = gtk_builder_new ();
   gtk_builder_add_from_file (builder, "src/osbuilder.ui", &error);
}

static GtkWidget* _window (void)
{
   get_builder();
   window = GTK_WIDGET (gtk_builder_get_object (builder, "window"));
   gtk_builder_connect_signals (builder, NULL);
   
   return window;
}

static GtkWidget* _btn_login (void)
{
   get_builder();
   btn_login = GTK_WIDGET (gtk_builder_get_object (builder, "btn_login"));
   gtk_builder_connect_signals (builder, NULL);

   return btn_login;
}

static GtkWidget* _menubar (void)
{
   get_builder();
   menubar = GTK_WIDGET (gtk_builder_get_object (builder, "menubar"));
   gtk_builder_connect_signals (builder, NULL);

   return menubar;
}

static GtkWidget* _buttonbox (void)
{
   get_builder();
   buttonbox = GTK_WIDGET (gtk_builder_get_object (builder, "buttonbox"));
   gtk_builder_connect_signals (builder, NULL);

   return buttonbox;
}

static GtkWidget* _notebook (void)
{
   get_builder();
   notebook = GTK_WIDGET (gtk_builder_get_object (builder, "notebook"));
   gtk_builder_connect_signals (builder, NULL);

   gtk_widget_show_all (GTK_WIDGET(notebook));

   return notebook;
}

Thank You Everyone.

tadeboro · **Posted:** Tue Oct 02, 2012 7:53 am

Hi.

I'm not sure you're aware of it, but during your application life cycle, you create not one but several distinct copies of your interface (each call to _-prefixed method creates one). Did you read any tutorial on how to use Glade from GTK+? Also, placing function definition in header file is something you should really avoid doing.

Anyhow, I remodeled your code into form that is usually used when developing applications using glade. Standard pattern of usage is: create builder, construct interface, store needed widget pointers and connect signals, destroy builder.

Code:

#include <gtk/gtk.h>

typedef struct _Data
{
  GtkWidget *window,
            *btn_login,
            *menubar,
            *buttonbox,
            *notebook;
}
Data;


static gboolean
create_gui (Data *data)
{
  GtkBuilder builder;
  GError *error = NULL;
  gboolean succ = TRUE;

  builder = gtk_builder_new ();
  if (!gtk_builder_add_from_file (builder, "osbuilder.ui", &error))
    {
      /* Report error here */
      g_error_free (error);
      succ = FALSE;
    }
  gtk_builder_connect_signals (builder, data);

#define GW(name) \
  data->name = GTK_WIDGET (gtk_builder_get_object (builder, #name));\
  if (!data->name)\
    succ = FALSE
  GW (window);
  GW (btn_login);
  GW (menubar);
  GW (buttonbox);
  GW (notebook);
#undef GW

  g_object_unref (builder);

  return succ;
}

G_MODULE_EXPORT void
btn_login_clicked_cb (GtkButton *button,
                      Data      *data)
{
  gtk_widget_set_sensitive (data->menubar, TRUE);
  gtk_widget_set_sensitive (data->buttonbox, TRUE);
  gtk_notebook_set_current_page (GTK_NOTEBOOK (data->notebook), 1);
}

int
main (int    argc,
      char **argv)
{
  Data *data;

  gtk_init (&argc, &argv);

  data = g_slice_new (Data);

  if (!create_gui (data))
    return 0;

  gtk_widget_show (data->window);

  gtk_main ();

  return 0;
}

Cheers,
Tadej

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Callback will not set widget sentative

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