Re: how to tell gtk to update only the GUI

[David Necas (Yeti)]

On Wed, May 03, 2006 at 10:03:34AM -0400, Tristan Van Berkom wrote:
> 
> If you need your application to refuse button & key press events
> (but still refresh itself graphicly), you should set the sensitivity
> of your buttons during the lengthly operation (and just ignore key
> press events).

I agree the right thing is normally to make the widgets
insensitive but it is possible to do what Mehmet requested
too with gtk_grab_add() on some `passive' widget -- see the
attached example.

Yeti


--
Anonyms eat their boogers.


===========================================================================
#include <gtk/gtk.h>

static void
response(GtkWidget *dialog,
         gint response_id)
{
    GtkWidget *progress;
    gint i, n = 1000;

    if (response_id != GTK_RESPONSE_APPLY) {
        gtk_main_quit();
        return;
    }

    progress = g_object_get_data(G_OBJECT(dialog), "progress");
    gtk_progress_bar_set_text(GTK_PROGRESS_BAR(progress), "Calculating...");
    gtk_grab_add(progress);

    for (i = 0; i < n; i++) {
        /* emulate a heavy calculation step */
        g_usleep(50);
        gtk_progress_bar_set_fraction(GTK_PROGRESS_BAR(progress), i/(n - 1.0));
        while (gtk_events_pending())
            gtk_main_iteration_do(FALSE);
    }
    gtk_progress_bar_set_fraction(GTK_PROGRESS_BAR(progress), 0.0);
    gtk_progress_bar_set_text(GTK_PROGRESS_BAR(progress), NULL);
    while (gtk_events_pending())
        gtk_main_iteration_do(FALSE);

    gtk_grab_remove(progress);
}

int
main(int argc, char *argv[])
{
    GtkWidget *dialog, *widget;
    GtkObject *adj;
    GtkBox *box;

    gtk_init(&argc, &argv);

    dialog = gtk_dialog_new_with_buttons("Modal Trick", NULL, 0,
                                         GTK_STOCK_EXECUTE,
                                         GTK_RESPONSE_APPLY,
                                         GTK_STOCK_CLOSE,
                                         GTK_RESPONSE_CLOSE,
                                         NULL);
    g_signal_connect(dialog, "response", G_CALLBACK(response), NULL);

    box = GTK_BOX(GTK_DIALOG(dialog)->vbox);

    widget = gtk_check_button_new_with_label("Check me!");
    gtk_box_pack_start(box, widget, FALSE, FALSE, 0);

    widget = gtk_entry_new();
    gtk_box_pack_start(box, widget, FALSE, FALSE, 0);

    adj = gtk_adjustment_new(0.0, 0.0, 100.0, 1.0, 10.0, 0.0);
    widget = gtk_hscale_new(GTK_ADJUSTMENT(adj));
    gtk_box_pack_start(box, widget, FALSE, FALSE, 0);

    widget = gtk_progress_bar_new();
    gtk_box_pack_start(box, widget, FALSE, FALSE, 0);
    g_object_set_data(G_OBJECT(dialog), "progress", widget);

    gtk_widget_show_all(dialog);
    gtk_main();

    return 0;
}

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