[gtk+/wip/baedert/symbolic-icons: 15/19] cssstylechange: Add helper function to print change

[Timm Bäder <baedert src gnome org>]

commit a668c6f6d961ba3ee26ac238f8f889e2a17c13fe
Author: Timm Bäder <mail baedert org>
Date:   Fri Feb 5 10:28:13 2016 +0100

    cssstylechange: Add helper function to print change
    
    So I don't have to print both styles to the console, paste them both
    into a file and then run diff on the 2 files anymore.

 gtk/gtkcssstylechange.c        |   32 ++++++++++++++++++++++++++++++++
 gtk/gtkcssstylechangeprivate.h |    1 +
 2 files changed, 33 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkcssstylechange.c b/gtk/gtkcssstylechange.c
index 0ce6120..809eff2 100644
--- a/gtk/gtkcssstylechange.c
+++ b/gtk/gtkcssstylechange.c
@@ -110,3 +110,35 @@ gtk_css_style_change_changes_property (GtkCssStyleChange *change,
   return _gtk_bitmask_get (change->changes, id);
 }
 
+void
+gtk_css_style_change_print_change (GtkCssStyleChange *change)
+{
+  int i;
+  GtkCssStyle *old = gtk_css_style_change_get_old_style (change);
+  GtkCssStyle *new = gtk_css_style_change_get_new_style (change);
+  GString *string;
+
+  for (i = 0; i < GTK_CSS_PROPERTY_N_PROPERTIES; i ++)
+    {
+      if (gtk_css_style_change_changes_property (change, i))
+        {
+          GtkCssStyleProperty *prop;
+          GtkCssValue *value;
+          const char *name;
+
+          prop = _gtk_css_style_property_lookup_by_id (i);
+          name = _gtk_style_property_get_name (GTK_STYLE_PROPERTY (prop));
+
+          string = g_string_new ("");
+          printf ("%s Changed:\n", name);
+          value = gtk_css_style_get_value (old, i);
+          _gtk_css_value_print (value, string);
+          printf ("  Old: %s\n", g_string_free (string, FALSE));
+
+          string = g_string_new ("");
+          value = gtk_css_style_get_value (new, i);
+          _gtk_css_value_print (value, string);
+          printf ("  New: %s\n", g_string_free (string, FALSE));
+        }
+    }
+}
diff --git a/gtk/gtkcssstylechangeprivate.h b/gtk/gtkcssstylechangeprivate.h
index 078dee0..dc5e9c5 100644
--- a/gtk/gtkcssstylechangeprivate.h
+++ b/gtk/gtkcssstylechangeprivate.h
@@ -47,6 +47,7 @@ gboolean        gtk_css_style_change_affects            (GtkCssStyleChange
                                                          GtkCssAffects           affects);
 gboolean        gtk_css_style_change_changes_property   (GtkCssStyleChange      *change,
                                                          guint                   id);
+void            gtk_css_style_change_print              (GtkCssStyleChange      *change);
 
 G_END_DECLS