Re: gtk-app-devel-list Digest, Vol 87, Issue 18

[Claude Simon <claude simon 78 gmail com>]

Thanks for your answer.

I have a small piece of code witch show the issue :


/*----------------------------------------------------------------------------*/

#include <gtk/gtk.h>

typedef struct widgets
{
    GtkEntry        * entry1;
} widgets;

static GtkWidget   * MainWindow           = NULL;
static widgets       w;

static int Text_changed = FALSE;

static int cb_entry_changed (GtkWidget * entry, gpointer p_data)
{

    while (g_main_context_iteration (NULL, FALSE));

    Text_changed = TRUE;
    return FALSE;
}

static void bck_destroy (GtkWidget * window, gpointer p_data)
{
    gtk_main_quit ();
}

static void create_and_connect_window (GtkBuilder * builder, char *
glade_file)
{
    GError     *error = NULL;

    /* Load UI from file. If error occurs, report it and quit application.
     * Replace "tut.glade" with your saved project. */
    if( ! gtk_builder_add_from_file( builder, glade_file, &error ) )
    {
        g_warning( "%s", error->message );
        g_free( error );
        return;
    }

    MainWindow = GTK_WIDGET( gtk_builder_get_object( builder, "bck" ));

    /* Connect signals */

    gtk_builder_connect_signals( builder, NULL );
    g_signal_connect (MainWindow, "delete-event", G_CALLBACK (bck_destroy),
NULL);

    w.entry1 = GTK_ENTRY (gtk_builder_get_object (builder, "entry1"));
    g_signal_connect (G_OBJECT (w.entry1), "focus-out-event", G_CALLBACK
(cb_entry_changed), NULL);
    g_signal_connect (G_OBJECT (w.entry1), "changed",         G_CALLBACK
(cb_entry_changed), NULL);
    gtk_entry_set_text (w.entry1, (gchar *)"");

}

int
main( int    argc,
      char **argv )
{
    GtkBuilder * builder;

    /* Init GTK+ */
    gtk_init( &argc, &argv );

    /* Create new GtkBuilder object */
    builder = gtk_builder_new();

    /* Get main window from glade file and connect signals */
    create_and_connect_window (builder, "bck.glade");

    if (MainWindow == NULL)
    {
        printf ("problème de création de la fenetre principale\n");
    }

    /* Destroy builder, since we don't need it anymore */
    g_object_unref( G_OBJECT( builder ) );

    /* Show window. All other widgets are automatically shown by GtkBuilder
*/
    gtk_widget_show( MainWindow );

    /* Start main loop */
    gtk_main();

    return 0;
}

with the statment :
    while (g_main_context_iteration (NULL, FALSE));

I get the error :
(backspace_test:5952): Pango-CRITICAL **: pango_layout_get_cursor_pos:
assertion `index >= 0 && index <= layout->length' failed

My problem is how to block the signal when the program is initializing entry
and unblock it when it is the user which is acting.

I am investigating signal disconnect and reconnect. Is it the good way to go
?


Claude Simon

2011/7/22 <gtk-app-devel-list-request gnome org>

> Send gtk-app-devel-list mailing list submissions to
>        gtk-app-devel-list gnome org
>
> To subscribe or unsubscribe via the World Wide Web, visit
>        http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
> or, via email, send a message with subject or body 'help' to
>        gtk-app-devel-list-request gnome org
>
> You can reach the person managing the list at
>        gtk-app-devel-list-owner gnome org
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of gtk-app-devel-list digest..."
>
>
> Today's Topics:
>
>   1. Pango-CRITICAL **: pango_layout_get_cursor_pos: assertion
>      `index >= 0       && index <= layout->length' failed (Claude Simon)
>   2. Re: Pango-CRITICAL **: pango_layout_get_cursor_pos: assertion
>      `index    >= 0    && index <= layout->length' failed (Bill Czermak)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 21 Jul 2011 17:08:05 +0200
> From: Claude Simon <claude simon 78 gmail com>
> To: gtk-app-devel-list gnome org
> Subject: Pango-CRITICAL **: pango_layout_get_cursor_pos: assertion
>        `index >= 0     && index <= layout->length' failed
> Message-ID:
>        <CAJ-OH1Y43gf5g5Btzy+GkrFEOd56OUqNdNChc+14U5BZk_6tjg mail gmail com
> >
> Content-Type: text/plain; charset=ISO-8859-1
>
> hello to all the guys here,
>
> I am new to gtk and I am doing a GUI for a program with it.
>
> All is ok, but there is one thing i don't understand.
>
> I have a call back entered when the event "changed" is triggered for a
> GtkEntry widget.
>
> When the user is deleting the last character with a backspace he get the
> following message at console :
>
> Pango-CRITICAL **: pango_layout_get_cursor_pos: assertion `index >= 0 &&
> index <= layout->length' failed
>
> The call back routine is doing nothing else that signaling a change to be
> saved.
>
> The effective change in the database is done on triggering
> "focus-out-event".
>
> I am surely missing an obvious thing ...
>
> What can i do to avoid such a  behavior ?
>
> Claude Simon
>
>
> ------------------------------
>
> Message: 2
> Date: Fri, 22 Jul 2011 08:58:47 +1000
> From: Bill Czermak <czermak netspace net au>
> To: gtk-app-devel-list gnome org
> Subject: Re: Pango-CRITICAL **: pango_layout_get_cursor_pos: assertion
>        `index  >= 0    && index <= layout->length' failed
> Message-ID: <4E28AF27 3010201 netspace net au>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> If you can post a minimal piece of code that demonstrates the error,
> then it makes it easier for people to help you.  Also in cutting back to
> minimal code, you may well find the problem for yourself.
>
> Rgds Bill
>
> On 22/07/11 01:08, Claude Simon wrote:
> > hello to all the guys here,
> >
> > I am new to gtk and I am doing a GUI for a program with it.
> >
> > All is ok, but there is one thing i don't understand.
> >
> > I have a call back entered when the event "changed" is triggered for a
> > GtkEntry widget.
> >
> > When the user is deleting the last character with a backspace he get the
> > following message at console :
> >
> > Pango-CRITICAL **: pango_layout_get_cursor_pos: assertion `index>= 0&&
> > index<= layout->length' failed
> >
> > The call back routine is doing nothing else that signaling a change to be
> > saved.
> >
> > The effective change in the database is done on triggering
> > "focus-out-event".
> >
> > I am surely missing an obvious thing ...
> >
> > What can i do to avoid such a  behavior ?
> >
> > Claude Simon
> > _______________________________________________
> > gtk-app-devel-list mailing list
> > gtk-app-devel-list gnome org
> > http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
>
>
>
> ------------------------------
>
> _______________________________________________
> gtk-app-devel-list mailing list
> gtk-app-devel-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
>
> End of gtk-app-devel-list Digest, Vol 87, Issue 18
> **************************************************