[gegl-edit] Added image preview widget to file chooser and file chooser now initializes on the current filename

[Isaac Wagner <isaacbw src gnome org>]

commit 5a6b99ec76e3cd9037241bbefc3cde9a4814ca4d
Author: Isaac Wagner <isaacbw src gnome org>
Date:   Wed Aug 8 22:19:27 2012 -0400

    Added image preview widget to file chooser and file chooser now initializes on the current filename if any

 gegl-edit/gegl-gtk-property-view.c |   33 ++++++++++++++++++++++++++++++++-
 1 files changed, 32 insertions(+), 1 deletions(-)
---
diff --git a/gegl-edit/gegl-gtk-property-view.c b/gegl-edit/gegl-gtk-property-view.c
index 04edbfd..4676897 100644
--- a/gegl-edit/gegl-gtk-property-view.c
+++ b/gegl-edit/gegl-gtk-property-view.c
@@ -271,21 +271,52 @@ proxy_checkbox_toggled (GtkToggleButton *togglebutton, PropertyCallbackData *dat
   }
 }
 
+//from http://developer.gnome.org/gtk/2.24/GtkFileChooser.html
+static void
+update_preview_cb (GtkFileChooser *file_chooser, gpointer data)
+{
+  GtkWidget *preview;
+  char *filename;
+  GdkPixbuf *pixbuf;
+  gboolean have_preview;
+
+  preview = GTK_WIDGET (data);
+  filename = gtk_file_chooser_get_preview_filename (file_chooser);
+
+  pixbuf = gdk_pixbuf_new_from_file_at_size (filename, 128, 128, NULL);
+  have_preview = (pixbuf != NULL);
+  g_free (filename);
+
+  gtk_image_set_from_pixbuf (GTK_IMAGE (preview), pixbuf);
+  if (pixbuf)
+    g_object_unref (pixbuf);
+
+  gtk_file_chooser_set_preview_widget_active (file_chooser, have_preview);
+}
+
 static void
 file_browse (GtkButton *button, PropertyCallbackData *data)
 {
   GtkWidget *window = gtk_widget_get_ancestor(GTK_WIDGET(button), GTK_TYPE_WINDOW);
+  GtkWidget *preview = gtk_image_new ();
   GtkWidget *chooser = gtk_file_chooser_dialog_new("Select", GTK_WINDOW(window), 
 						   GTK_FILE_CHOOSER_ACTION_SAVE, 
 						   GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL, 
 						   GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT,
 						   NULL);
+
+  gtk_file_chooser_set_filename(GTK_FILE_CHOOSER(chooser), gtk_entry_get_text(GTK_ENTRY(data->value_entry)));
+  gtk_file_chooser_set_preview_widget (GTK_FILE_CHOOSER(chooser), preview);
+  g_signal_connect(chooser, "update-preview",
+            G_CALLBACK (update_preview_cb), preview);
+
   gint result = gtk_dialog_run(GTK_DIALOG(chooser));
-  if(result)
+  if(result == GTK_RESPONSE_ACCEPT)
     {
       gtk_entry_set_text(GTK_ENTRY(data->value_entry), gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(chooser)));
       g_signal_emit_by_name(data->value_entry, "activate");
     }
+
   gtk_widget_destroy(chooser);
 }