[evolution/gnome-3-8] Bug 698488 - Attachment file chooser should preview attachments' content when possible

[Fabiano Fidêncio <ffidencio src gnome org>]

commit e90c8380f91ecbff3f0125c89b5a90ca1d26acde
Author: Fabiano Fidêncio <fidencio redhat com>
Date:   Sat Apr 20 23:01:48 2013 +0200

    Bug 698488 - Attachment file chooser should preview attachments' content when possible

 e-util/e-attachment-store.c |   35 +++++++++++++++++++++++++++++++++++
 1 files changed, 35 insertions(+), 0 deletions(-)
---
diff --git a/e-util/e-attachment-store.c b/e-util/e-attachment-store.c
index 16f38fb..a608c06 100644
--- a/e-util/e-attachment-store.c
+++ b/e-util/e-attachment-store.c
@@ -24,6 +24,7 @@
 #endif
 
 #include "e-attachment-store.h"
+#include "e-icon-factory.h"
 
 #include <errno.h>
 #include <glib/gi18n.h>
@@ -415,6 +416,31 @@ e_attachment_store_get_total_size (EAttachmentStore *store)
        return total_size;
 }
 
+static void
+update_preview_cb (GtkFileChooser *file_chooser,
+                  gpointer data)
+{
+       GtkWidget *preview;
+       gchar *filename = NULL;
+       GdkPixbuf *pixbuf;
+
+       gtk_file_chooser_set_preview_widget_active (file_chooser, FALSE);
+       gtk_image_clear (GTK_IMAGE (data));
+       preview = GTK_WIDGET (data);
+       filename = gtk_file_chooser_get_preview_filename (file_chooser);
+       if (filename == NULL)
+               return;
+
+       pixbuf = gdk_pixbuf_new_from_file_at_size (filename, 128, 128, NULL);
+       g_free (filename);
+       if (!pixbuf)
+               return;
+
+       gtk_file_chooser_set_preview_widget_active (file_chooser, TRUE);
+       gtk_image_set_from_pixbuf (GTK_IMAGE (preview), pixbuf);
+       g_object_unref (pixbuf);
+}
+
 void
 e_attachment_store_run_load_dialog (EAttachmentStore *store,
                                     GtkWindow *parent)
@@ -422,6 +448,7 @@ e_attachment_store_run_load_dialog (EAttachmentStore *store,
        GtkFileChooser *file_chooser;
        GtkWidget *dialog;
        GtkWidget *option;
+       GtkImage *preview;
        GSList *files, *iter;
        const gchar *disposition;
        gboolean active;
@@ -442,6 +469,14 @@ e_attachment_store_run_load_dialog (EAttachmentStore *store,
        gtk_dialog_set_default_response (GTK_DIALOG (dialog), GTK_RESPONSE_OK);
        gtk_window_set_icon_name (GTK_WINDOW (dialog), "mail-attachment");
 
+       preview = GTK_IMAGE (gtk_image_new ());
+       gtk_file_chooser_set_preview_widget (
+               GTK_FILE_CHOOSER (file_chooser),
+               GTK_WIDGET (preview));
+       g_signal_connect (
+               file_chooser, "update-preview",
+               G_CALLBACK (update_preview_cb), preview);
+
        option = gtk_check_button_new_with_mnemonic (
                _("_Suggest automatic display of attachment"));
        gtk_file_chooser_set_extra_widget (file_chooser, option);