Hello.
> Below is a minimal test program. I'd expect that, since the spin
> button's range is set as 1 to 4, I ought to be able to display
> "B", "C" and "D" in turn by pressing the button's up-arrow. But
> what actually happens is that the first up-press gives "B" and
> then subsequent up-presses leave the displayed value at "B": I
> can't make it show "C" or "D". Can anyone tell me what I'm doing
> wrong? Thanks!
If you do anything fancy inside your GtkSpinButton::output signal
handler (this basically means that you set spin button to hold
non-numeric data like in your case), you need to also provide handler
for GtkSpinButton::input signal. Input signal is not properly
documented, but it's function is to take the contents of the spin
button and convert it to gdouble number.
I updated your sample code to show you how this fits together. API
docs will be updated soonish (I do have a patch, but it must wait
until docs are migrated from template files to sources).
------------
#include <gtk/gtk.h>
gchar *n_to_alpha (int n)
{
if (n == 1) {
return g_strdup("A");
} else if (n == 2) {
return g_strdup("B");
} else if (n == 3) {
return g_strdup("C");
} else if (n == 4) {
return g_strdup("D");
} else {
return g_strdup("X");
}
}
static gboolean
alpha_input (GtkSpinButton *spin,
gdouble *new_val,
gpointer p)
{
gchar current;
current = (gtk_entry_get_text (GTK_ENTRY (spin)))[0];
*new_val = current - 'A' + 1;
return TRUE;
}
gint alpha_output (GtkSpinButton *spin, gpointer p)
{
gint n = gtk_spin_button_get_value_as_int(spin);
gchar *s = n_to_alpha(n);
printf("obs_button_output: %d -> '%s'\n", n, s);
gtk_entry_set_text(GTK_ENTRY(spin), s);
g_free(s);
return TRUE; /* block the default output */
}
int main (int argc, char **argv)
{
GtkWidget *w, *spinner;
gtk_init(&argc, &argv);
w = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_default_size(GTK_WINDOW(w), 100, -1);
gtk_container_set_border_width(GTK_CONTAINER(w), 5);
g_signal_connect(G_OBJECT(w), "destroy",
gtk_main_quit, NULL);
spinner = gtk_spin_button_new_with_range(1, 4, 1);
gtk_spin_button_set_numeric(GTK_SPIN_BUTTON(spinner), FALSE);
g_signal_connect(G_OBJECT(spinner), "input",
G_CALLBACK(alpha_input), NULL);
g_signal_connect(G_OBJECT(spinner), "output",
G_CALLBACK(alpha_output), NULL);
gtk_container_add(GTK_CONTAINER(w), spinner);
gtk_widget_show_all(w);
gtk_main();
return 0;
}
---------
Tadej
--
Tadej Borovšak
tadeboro.blogspot.com
tadeb...@gmail.com
tadej.borov...@gmail.com
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