[glabels] Optimize loading of barcode styles.

[Jim Evins <jimevins src gnome org>]

commit 0dc2f0a1cfcef51429248c80522723a1a5a0b71b
Author: Jim Evins <evins snaught com>
Date:   Tue Dec 7 14:36:25 2010 -0500

    Optimize loading of barcode styles.
    
    Only load barcode styles into object editor combo box if backend ID has
    changed.  Otherwise, skip loading.  This seems to be a very expensive
    operation and would manifest itself as sluggish resizes of barcodes.

 src/object-editor-bc-page.c |   21 ++++++++++++++-------
 src/object-editor-private.h |    1 +
 src/object-editor.c         |    1 +
 3 files changed, 16 insertions(+), 7 deletions(-)
---
diff --git a/src/object-editor-bc-page.c b/src/object-editor-bc-page.c
index ca3aaff..270b785 100644
--- a/src/object-editor-bc-page.c
+++ b/src/object-editor-bc-page.c
@@ -280,15 +280,22 @@ gl_object_editor_load_bc_styles (glObjectEditor      *editor,
  
 	gl_debug (DEBUG_EDITOR, "START");
 
-        g_signal_handlers_block_by_func (G_OBJECT (editor->priv->bc_style_combo),
-                                         style_changed_cb, editor);
+        if ( !editor->priv->current_backend_id ||
+             strcmp(editor->priv->current_backend_id, backend_id) != 0 )
+        {
+                g_signal_handlers_block_by_func (G_OBJECT (editor->priv->bc_style_combo),
+                                                 style_changed_cb, editor);
 
-	styles = gl_barcode_backends_get_styles_list (backend_id);
-	gl_combo_util_set_strings (GTK_COMBO_BOX_TEXT(editor->priv->bc_style_combo), styles);
-	gl_barcode_backends_free_styles_list (styles);
+                styles = gl_barcode_backends_get_styles_list (backend_id);
+                gl_combo_util_set_strings (GTK_COMBO_BOX_TEXT(editor->priv->bc_style_combo), styles);
+                gl_barcode_backends_free_styles_list (styles);
 
-        g_signal_handlers_unblock_by_func (G_OBJECT (editor->priv->bc_style_combo),
-                                         style_changed_cb, editor);
+                g_free (editor->priv->current_backend_id);
+                editor->priv->current_backend_id = g_strdup (backend_id);
+
+                g_signal_handlers_unblock_by_func (G_OBJECT (editor->priv->bc_style_combo),
+                                                   style_changed_cb, editor);
+        }
 
 	gl_debug (DEBUG_EDITOR, "END");
 }
diff --git a/src/object-editor-private.h b/src/object-editor-private.h
index 09175d0..053bcde 100644
--- a/src/object-editor-private.h
+++ b/src/object-editor-private.h
@@ -135,6 +135,7 @@ struct _glObjectEditorPrivate {
 	GtkWidget  *bc_key_radio;
 	GtkWidget  *bc_key_hbox;
 	GtkWidget  *bc_key_combo;
+        gchar      *current_backend_id;
 
 	GtkWidget  *data_page_vbox;
 	GtkWidget  *data_literal_radio;
diff --git a/src/object-editor.c b/src/object-editor.c
index 0901cdd..b258f4e 100644
--- a/src/object-editor.c
+++ b/src/object-editor.c
@@ -208,6 +208,7 @@ gl_object_editor_finalize (GObject *object)
 
         g_object_unref (editor->priv->builder);
 
+        g_free (editor->priv->current_backend_id);
 	g_free (editor->priv);
 
 	G_OBJECT_CLASS (gl_object_editor_parent_class)->finalize (object);