[recipes] Add some placeholders to newly-added rows

[Matthias Clasen <matthiasc src gnome org>]

commit 9fb70392469654a5118bcf5980068e40671176d7
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun May 14 10:47:13 2017 -0400

    Add some placeholders to newly-added rows
    
    Adding completely empty rows is confusing, and doesn't
    provide any hints about what is expected in the entries.
    
    Add some placeholder text that helps for both of these
    issues.

 src/gr-ingredients-viewer-row.c |   25 ++++++++++++++++++++++---
 1 files changed, 22 insertions(+), 3 deletions(-)
---
diff --git a/src/gr-ingredients-viewer-row.c b/src/gr-ingredients-viewer-row.c
index de4d9e8..bba986b 100644
--- a/src/gr-ingredients-viewer-row.c
+++ b/src/gr-ingredients-viewer-row.c
@@ -141,9 +141,28 @@ update_unit (GrIngredientsViewerRow *row)
         space = amount[0] ? " " : "";
         unit = row->unit ? row->unit : "";
         tmp = g_strdup_printf ("%s%s%s", amount, space, unit);
-        gtk_label_set_label (GTK_LABEL (row->unit_label), tmp);
+        if (tmp[0] == '\0') {
+                gtk_style_context_add_class (gtk_widget_get_style_context (row->unit_label), "dim-label");
+                gtk_label_set_label (GTK_LABEL (row->unit_label), _("Amount…"));
+        }
+        else {
+                gtk_style_context_remove_class (gtk_widget_get_style_context (row->unit_label), "dim-label");
+                gtk_label_set_label (GTK_LABEL (row->unit_label), tmp);
+        }
 }
 
+static void
+update_ingredient (GrIngredientsViewerRow *row)
+{
+      if (row->ingredient[0] == '\0') {
+                gtk_style_context_add_class (gtk_widget_get_style_context (row->ingredient_label), 
"dim-label");
+                gtk_label_set_label (GTK_LABEL (row->ingredient_label), _("Ingredient…"));
+      }
+      else {
+                gtk_style_context_remove_class (gtk_widget_get_style_context (row->ingredient_label), 
"dim-label");
+                gtk_label_set_label (GTK_LABEL (row->ingredient_label), row->ingredient);
+      }
+}
 
 static void
 gr_ingredients_viewer_row_set_amount (GrIngredientsViewerRow *row,
@@ -169,7 +188,7 @@ gr_ingredients_viewer_row_set_ingredient (GrIngredientsViewerRow *row,
 {
         g_free (row->ingredient);
         row->ingredient = g_strdup (ingredient);
-        gtk_label_set_label (GTK_LABEL (row->ingredient_label), ingredient);
+        update_ingredient (row);
 }
 
 static void
@@ -346,7 +365,7 @@ save_ingredient (GrIngredientsViewerRow *row)
         visible = gtk_stack_get_visible_child (GTK_STACK (row->ingredient_stack));
         if (visible == row->ingredient_entry) {
                 row->ingredient = g_strdup (gtk_entry_get_text (GTK_ENTRY (row->ingredient_entry)));
-                gtk_label_set_label (GTK_LABEL (row->ingredient_label), row->ingredient);
+                update_ingredient (row);
                 gtk_stack_set_visible_child (GTK_STACK (row->ingredient_stack), row->ingredient_event_box);
         }
 }