** GTK+ (almost) exonerated **
I've spent quite a bit of time delving into the problems I encountered with
Gtk::FileChooserButton. I started by writing a minimal app using a main window
with a child button. The button launched a modal dialog box which contained a
Gtk::FileChooserButton. I built the app for Windows (using VC++ and gtk-win32)
and then for Linux (using gcc and gtk-x11). It behaved exactly as expected
(and pretty much identically) on both OS's.
The only problem with the above was that I couldn't find am obvious way to
preselect a startup folder for the FileChooser dialog. The only way I found
was to create a Gtk::FileChooser dialog separately, then attach it to a button
using gtk_file_chooser_new_with_dialog(). However, when I do that I see some
marked differences in the Linux behaviour compared to the Windows behaviour.
The main difference is that under Windows there seems to be an inherent link
between the FileChooser dialog and its associated FileChooserButton. e.g. if I
choose a particular file then press "Open", the chosen filename appears
automatically in the associated FileChooserButton. This doesn't work when I
build under Linux with gcc. Likewise, with this new strategy I can preselect a
startup folder using gtk_file_chooser_set_filename() (see the code below).
This works every time in my Windows build but almost never works in the Linux
build.
I've listed the code below on the assumption that I've maybe missed out an
important step somewhere. Can anyone see any obvious mistakes with my approach?
John
static void
button_clicked (GtkWidget *window, gpointer data)
{
gsize bytes_written, bytes_read;
GtkWidget *vbox;
GtkWidget *dialog;
GtkWidget *file_chooser_button;
GError *error = 0;
dialog = gtk_dialog_new_with_buttons("File Chooser", (GtkWindow*)data,
GTK_DIALOG_MODAL | GTK_DIALOG_DESTROY_WITH_PARENT,
GTK_STOCK_CANCEL, GTK_RESPONSE_REJECT,
NULL);
if (dialog)
{
// Choose an arbitrary file for pre-selection which is known to exist on both
OS's
#ifdef WIN32
const gchar* home = "C:\\Users\\johne53\\.jackdrc";
#else
const gchar* home = "/home/johne53/.jackdrc";
#endif
GtkWidget* file_chooser_dialog = gtk_file_chooser_dialog_new ("Choose a
file", GTK_WINDOW(dialog),
GTK_FILE_CHOOSER_ACTION_OPEN,
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OPEN, GTK_RESPONSE_OK,
NULL);
if (file_chooser_dialog)
{
file_chooser_button = gtk_file_chooser_button_new_with_dialog
(file_chooser_dialog);
if (file_chooser_button)
{
// This always works
printf ("Initializing FileChooser file to:- %s\n", home);
// This works in the Win32 build but not in the Linux build
gtk_file_chooser_set_filename((GtkFileChooser*)file_chooser_dialog,
g_filename_to_utf8(home, strlen(home), &bytes_read,
&bytes_written, &error))
vbox = gtk_dialog_get_content_area (GTK_DIALOG (dialog));
gtk_box_pack_start (GTK_BOX(vbox), file_chooser_button, TRUE,
TRUE, 0);
gtk_widget_show_all (dialog);
}
}
gtk_dialog_run((GtkDialog*)dialog);
gtk_widget_destroy(dialog);
}
}
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