[gtk+/portal: 12/14] Add api to serialize GtkPrintSettings to a variant

[Matthias Clasen <matthiasc src gnome org>]

commit 9a91153fa844705a51cb8418759305459546307f
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Jul 2 20:29:08 2016 -0400

    Add api to serialize GtkPrintSettings to a variant
    
    This will be useful for portalized print support.

 gtk/gtkprintsettings.c |   48 ++++++++++++++++++++++++++++++++++++++++++++++++
 gtk/gtkprintsettings.h |    6 ++++++
 2 files changed, 54 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkprintsettings.c b/gtk/gtkprintsettings.c
index f2cf860..f500a08 100644
--- a/gtk/gtkprintsettings.c
+++ b/gtk/gtkprintsettings.c
@@ -1941,3 +1941,51 @@ gtk_print_settings_to_key_file (GtkPrintSettings  *settings,
                              (GtkPrintSettingsFunc) add_value_to_key_file,
                              &data);
 }
+
+static void
+add_to_variant (const gchar *key,
+                const gchar *value,
+                gpointer     data)
+{
+  GVariantBuilder *builder = data;
+  g_variant_builder_add (builder, "{sv}", key, g_variant_new_string (value));
+}
+
+GVariant *
+gtk_print_settings_to_gvariant (GtkPrintSettings *settings)
+{
+  GVariantBuilder builder;
+
+  g_variant_builder_init (&builder, G_VARIANT_TYPE_VARDICT);
+  gtk_print_settings_foreach (settings, add_to_variant, &builder);
+
+  return g_variant_builder_end (&builder);
+}
+
+GtkPrintSettings *
+gtk_print_settings_from_gvariant (GVariant *variant)
+{
+  GtkPrintSettings *settings;
+  int i;
+
+  g_return_val_if_fail (g_variant_is_of_type (variant, G_VARIANT_TYPE_VARDICT), NULL);
+
+  settings = gtk_print_settings_new ();
+
+  for (i = 0; i < g_variant_n_children (variant); i++)
+    {
+      const char *key;
+      GVariant *v;
+
+      g_variant_get_child (variant, i, "{&sv}", &key, &v);
+      if (g_variant_is_of_type (v, G_VARIANT_TYPE_STRING))
+        {
+          const char *value;
+          g_variant_get (v, "&s", &value);
+          gtk_print_settings_set (settings, key, value);
+        }
+      g_variant_unref (v);
+    }
+
+  return settings;
+}
diff --git a/gtk/gtkprintsettings.h b/gtk/gtkprintsettings.h
index fe47dd2..15507e8 100644
--- a/gtk/gtkprintsettings.h
+++ b/gtk/gtkprintsettings.h
@@ -344,6 +344,12 @@ GDK_AVAILABLE_IN_ALL
 void                  gtk_print_settings_set_output_bin        (GtkPrintSettings   *settings,
                                                                const gchar        *output_bin);
 
+GDK_AVAILABLE_IN_3_22
+GVariant             *gtk_print_settings_to_gvariant           (GtkPrintSettings   *settings);
+GDK_AVAILABLE_IN_3_22
+GtkPrintSettings     *gtk_print_settings_from_gvariant         (GVariant           *variant);
+
+
 G_END_DECLS
 
 #endif /* __GTK_PRINT_SETTINGS_H__ */