FileChooserIF.addOnConfirmOverwrite

This signal gets emitted whenever it is appropriate to present a confirmation dialog when the user has selected a file name that already exists. The signal only gets emitted when the file chooser is in GTK_FILE_CHOOSER_ACTION_SAVE mode.

Most applications just need to turn on the do-overwrite-confirmation property (or call the gtk_file_chooser_set_do_overwrite_confirmation() function), and they will automatically get a stock confirmation dialog. Applications which need to customize this behavior should do that, and also connect to the confirm-overwrite signal.

A signal handler for this signal must return a GtkFileChooserConfirmation value, which indicates the action to take. If the handler determines that the user wants to select a different filename, it should return GTK_FILE_CHOOSER_CONFIRMATION_SELECT_AGAIN. If it determines that the user is satisfied with his choice of file name, it should return GTK_FILE_CHOOSER_CONFIRMATION_ACCEPT_FILENAME. On the other hand, if it determines that the stock confirmation dialog should be used, it should return GTK_FILE_CHOOSER_CONFIRMATION_CONFIRM. The following example illustrates this.

Custom confirmation

static GtkFileChooserConfirmation
confirm_overwrite_callback (GtkFileChooser *chooser, gpointer data)
{
char *uri;

uri = gtk_file_chooser_get_uri (chooser);

if (is_uri_read_only (uri))
{
if (user_wants_to_replace_read_only_file (uri))
return GTK_FILE_CHOOSER_CONFIRMATION_ACCEPT_FILENAME;
else
return GTK_FILE_CHOOSER_CONFIRMATION_SELECT_AGAIN;
} else
return GTK_FILE_CHOOSER_CONFIRMATION_CONFIRM; // fall back to the default dialog
}

...

chooser = gtk_file_chooser_dialog_new (...);

gtk_file_chooser_set_do_overwrite_confirmation (GTK_FILE_CHOOSER (dialog), TRUE);
g_signal_connect (chooser, "confirm-overwrite",
G_CALLBACK (confirm_overwrite_callback), NULL);

if (gtk_dialog_run (chooser) == GTK_RESPONSE_ACCEPT)
save_to_file (gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (chooser));

gtk_widget_destroy (chooser);