Re: Getting the icons used by GtkFileChooser
- From: Federico Mena Quintero <federico ximian com>
- To: Michael Natterer <mitch gimp org>
- Cc: GTK+ development mailing list <gtk-devel-list gnome org>
- Subject: Re: Getting the icons used by GtkFileChooser
- Date: Wed, 03 Mar 2004 15:26:16 -0600
On Tue, 2004-03-02 at 11:58, Michael Natterer wrote:
> With the new automatic backend choosing of GtkFileChooser most people
> will sooner or later use the gnome-vfs backend without even knowing
> it, let alone explicitely linking against gnome-vfs.
>
> The file chooser will then use nice icons for all kinds of
> mime-types. What I hacked up for GIMP looks like this:
>
> http://mitch.gimp.org/filechooser/chooser-shot-5.png
>
> You'll notice the preview of the selected file is exactly the same as
> in the file tree view. To render the icon, I can safely use the
> semi-private GtkFileSystem API (if I #ifdef enough to be safe against
> API changes).
I don't think applications should display a preview for files they
*really* know they cannot open. That is, the GIMP shouldn't display a
big socket icon as a preview for a Unix socket. A text editor shouldn't
display a preview for image files, etcetera.
This is precisely what gtk_file_chooser_set_preview_active() is for. In
your ::update_preview() callback, you call that function with FALSE if
you can't generate a preview for the file in question. The file chooser
will hide the preview widget in that case.
As for thumbnailing in the GIMP, which is what we discussed on IRC:
1. There is no guarantee that the user will have the gnome-vfs backend
installed, so Nautilus or thumbnail-spec thumbnails may not be
available. In that case, displaying a plain mime-type icon in the
preview as a fallback is useless to users.
2. The GIMP should *really* have a way to generate thumbnails
automatically, without waiting for the user to click on the Preview
button first --- at least for JPEG files which are ultra-common and
allow for quick generation of thumbnails. I know you told me that this
is planned :)
I really fear that exposing data from the internal GtkFileInfo will lead
to all sorts of questions around GTK+/glib not providing a VFS interface
of its own. This is beyond the scope of GTK+, and is rather a
Freedesktop.org issue.
Federico
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