static char *voff_ac_cmd(void * arg)
{
double *argp;
int rv;
argp = (double *)(arg);
rv = set_vert_offset(*argp, 1);
if ( rv < 0 ) {
return "could not set vertical offset";
}
return NULL;
}
static gboolean dialog_set_offset(int chan_num)
{
scope_vert_t *vert;
scope_chan_t *chan;
dialog_generic_t dialog;
gchar *title, msg[BUFLEN], *cptr;
struct offset_data data;
GtkWidget *label, *button;
double tmp;
vert = &(ctrl_usr->vert);
chan = &(ctrl_usr->chan[chan_num - 1]);
title = _("Set Offset");
snprintf(msg, BUFLEN - 1, _("Set the vertical offset\n"
"for channel %d."), chan_num);
/* create dialog window, disable resizing */
dialog.retval = 0;
dialog.window = gtk_dialog_new();
dialog.app_data = &data;
/* allow user to grow but not shrink the window */
gtk_window_set_policy(GTK_WINDOW(dialog.window), FALSE, TRUE, FALSE);
/* window should appear in center of screen */
gtk_window_set_position(GTK_WINDOW(dialog.window), GTK_WIN_POS_CENTER);
/* set title */
gtk_window_set_title(GTK_WINDOW(dialog.window), title);
/* display message */
label = gtk_label_new(msg);
gtk_misc_set_padding(GTK_MISC(label), 15, 5);
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog.window)->vbox), label, FALSE,
TRUE, 0);
/* a separator */
gtk_hseparator_new_in_box(GTK_DIALOG(dialog.window)->vbox, 0);
/* a checkbox: AC coupled */
vert->offset_ac = gtk_check_button_new_with_label(_("AC Coupled"));
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog.window)->vbox),
vert->offset_ac, FALSE, TRUE, 0);
/* react to changes to the checkbox */
gtk_signal_connect(GTK_OBJECT(vert->offset_ac), "toggled",
GTK_SIGNAL_FUNC(offset_changed), &data);
/* the entry */
vert->offset_entry = gtk_entry_new();
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog.window)->vbox),
vert->offset_entry, FALSE, TRUE, 0);
snprintf(data.buf, BUFLEN, "%f", chan->vert_offset);
gtk_entry_set_text(GTK_ENTRY(vert->offset_entry), data.buf);
gtk_entry_set_max_length(GTK_ENTRY(vert->offset_entry), BUFLEN-1);
/* point at first char */
gtk_entry_set_position(GTK_ENTRY(vert->offset_entry), 0);
/* select all chars, so if the user types the original value goes away */
gtk_entry_select_region(GTK_ENTRY(vert->offset_entry), 0, strlen(data.buf));
/* make it active so user doesn't have to click on it */
gtk_widget_grab_focus(GTK_WIDGET(vert->offset_entry));
gtk_widget_show(vert->offset_entry);
/* capture entry data to the buffer whenever the user types */
gtk_signal_connect(GTK_OBJECT(vert->offset_entry), "changed",
GTK_SIGNAL_FUNC(offset_changed), data.buf);
/* set up a callback function when the window is destroyed */
gtk_signal_connect(GTK_OBJECT(dialog.window), "destroy",
GTK_SIGNAL_FUNC(dialog_generic_destroyed), &dialog);
/* make OK and Cancel buttons */
button = gtk_button_new_with_label(_("OK"));
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog.window)->action_area),
button, TRUE, TRUE, 4);
gtk_signal_connect(GTK_OBJECT(button), "clicked",
GTK_SIGNAL_FUNC(dialog_generic_button1), &dialog);
/* hit the "OK" button if the user hits enter */
gtk_signal_connect(GTK_OBJECT(vert->offset_entry), "activate",
GTK_SIGNAL_FUNC(offset_activated), button);
button = gtk_button_new_with_label(_("Cancel"));
gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog.window)->action_area),
button, TRUE, TRUE, 4);
gtk_signal_connect(GTK_OBJECT(button), "clicked",
GTK_SIGNAL_FUNC(dialog_generic_button2), &dialog);
/* make window transient and modal */
gtk_window_set_transient_for(GTK_WINDOW(dialog.window),
GTK_WINDOW(ctrl_usr->main_win));
gtk_window_set_modal(GTK_WINDOW(dialog.window), TRUE);
gtk_widget_show_all(dialog.window);
gtk_main();
/* we get here when the user makes a selection, hits Cancel, or closes
the window */
if ((dialog.retval == 0) || (dialog.retval == 2)) {
/* user either closed dialog, or hit cancel */
return FALSE;
}
tmp = strtod(data.buf, &cptr);
if (cptr == data.buf) {
return FALSE;
}
set_vert_offset(tmp, data.ac_coupled);
return TRUE;
}
