[gnome-control-center] printers: Vertically center text for no devices

[Marek Kašík <mkasik src gnome org>]

commit 6d5d28e7d4628cfaf8aa5f85ed601ec099296a95
Author: Marek Kasik <mkasik redhat com>
Date:   Wed Feb 12 15:15:46 2014 +0100

    printers: Vertically center text for no devices
    
    Move the text "No printers detected." to its own GtkLabel
    which is vertically and horizontally centerd and show it
    instead of GtkTreeView when no devices were found.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=706897

 panels/printers/new-printer-dialog.ui   |   34 +++++++++++++++++++++---
 panels/printers/pp-new-printer-dialog.c |   43 +++++--------------------------
 2 files changed, 36 insertions(+), 41 deletions(-)
---
diff --git a/panels/printers/new-printer-dialog.ui b/panels/printers/new-printer-dialog.ui
index e0e05bb..d036168 100644
--- a/panels/printers/new-printer-dialog.ui
+++ b/panels/printers/new-printer-dialog.ui
@@ -125,13 +125,37 @@
                     <property name="can_focus">True</property>
                     <property name="shadow_type">in</property>
                     <child>
-                      <object class="GtkTreeView" id="devices-treeview">
+                      <object class="GtkStack" id="stack">
                         <property name="visible">True</property>
                         <property name="can_focus">True</property>
-                        <property name="model">devices-liststore</property>
-                        <property name="headers_visible">False</property>
-                        <child internal-child="selection">
-                          <object class="GtkTreeSelection" id="treeview-selection"/>
+                        <property name="transition-type">none</property>
+                        <child>
+                          <object class="GtkTreeView" id="devices-treeview">
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="model">devices-liststore</property>
+                            <property name="headers_visible">False</property>
+                            <child internal-child="selection">
+                              <object class="GtkTreeSelection" id="treeview-selection"/>
+                            </child>
+                          </object>
+                          <packing>
+                            <property name="name">standard-page</property>
+                          </packing>
+                        </child>
+                        <child>
+                          <object class="GtkLabel" id="no-devices-label">
+                            <property name="visible">True</property>
+                            <property name="can_focus">False</property>
+                            <property name="sensitive">False</property>
+                            <property name="label" translatable="yes" comments="Translators: No printers 
were found">No printers detected.</property>
+                            <attributes>
+                              <attribute name="weight" value="bold"/>
+                            </attributes>
+                          </object>
+                          <packing>
+                            <property name="name">no-printers-page</property>
+                          </packing>
                         </child>
                       </object>
                     </child>
diff --git a/panels/printers/pp-new-printer-dialog.c b/panels/printers/pp-new-printer-dialog.c
index 36c043d..555d24d 100644
--- a/panels/printers/pp-new-printer-dialog.c
+++ b/panels/printers/pp-new-printer-dialog.c
@@ -1610,14 +1610,13 @@ static void
 actualize_devices_list (PpNewPrinterDialog *dialog)
 {
   PpNewPrinterDialogPrivate *priv = dialog->priv;
-  GtkTreeViewColumn *column;
   GtkTreeSelection  *selection;
   GtkListStore      *store;
   GtkTreeView       *treeview;
   GtkTreeIter        iter;
+  GtkWidget         *widget;
   gboolean           no_device = TRUE;
   TDevice           *device;
-  gfloat             yalign;
   GList             *item;
   gchar             *display_string;
 
@@ -1681,9 +1680,8 @@ actualize_devices_list (PpNewPrinterDialog *dialog)
         }
     }
 
-  column = gtk_tree_view_get_column (treeview, 0);
-  if (priv->text_renderer)
-    gtk_cell_renderer_get_alignment (priv->text_renderer, NULL, &yalign);
+  widget = (GtkWidget *)
+    gtk_builder_get_object (priv->builder, "stack");
 
   if (no_device &&
       !priv->cups_searching &&
@@ -1692,38 +1690,9 @@ actualize_devices_list (PpNewPrinterDialog *dialog)
       !priv->samba_host_searching &&
       !priv->samba_authenticated_searching &&
       !priv->samba_searching)
-    {
-      if (priv->text_renderer)
-        gtk_cell_renderer_set_alignment (priv->text_renderer, 0.5, yalign);
-
-      if (column)
-        gtk_tree_view_column_set_max_width (column, 0);
-
-      gtk_widget_set_sensitive (GTK_WIDGET (treeview), FALSE);
-
-      display_string = g_markup_printf_escaped ("<b>%s</b>\n",
-      /* Translators: No printers were found */
-                                                _("No printers detected."));
-
-      gtk_list_store_append (store, &iter);
-      gtk_list_store_set (store, &iter,
-                          DEVICE_DISPLAY_NAME_COLUMN, display_string,
-                          -1);
-
-      g_free (display_string);
-    }
+    gtk_stack_set_visible_child_name (GTK_STACK (widget), "no-printers-page");
   else
-    {
-      if (priv->text_renderer)
-        gtk_cell_renderer_set_alignment (priv->text_renderer, 0.0, yalign);
-
-      if (column)
-        {
-          gtk_tree_view_column_set_max_width (column, -1);
-          gtk_tree_view_column_set_min_width (column, 80);
-        }
-      gtk_widget_set_sensitive (GTK_WIDGET (treeview), TRUE);
-    }
+    gtk_stack_set_visible_child_name (GTK_STACK (widget), "standard-page");
 
   if (!no_device &&
       gtk_tree_model_get_iter_first ((GtkTreeModel *) store, &iter) &&
@@ -1809,6 +1778,8 @@ populate_devices_list (PpNewPrinterDialog *dialog)
   gtk_cell_renderer_set_padding (priv->icon_renderer, 4, 4);
   column = gtk_tree_view_column_new_with_attributes ("Icon", priv->icon_renderer,
                                                      "gicon", DEVICE_GICON_COLUMN, NULL);
+  gtk_tree_view_column_set_max_width (column, -1);
+  gtk_tree_view_column_set_min_width (column, 80);
   gtk_tree_view_append_column (GTK_TREE_VIEW (treeview), column);