Add back compat for GObject 2.22 which lacks GBinding

6 files changed, 1361 insertions, 3 deletions

diff --git a/cfg.mk b/cfg.mk
index ca46013..e8d80a0 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -127,8 +127,8 @@ sc_check_author_list:
 
 exclude_file_name_regexp--sc_preprocessor_indentation = ^*/*.[ch]
 exclude_file_name_regexp--sc_prohibit_strcmp = ^*/*.[ch]
-exclude_file_name_regexp--sc_require_config_h = ^plugin/
-exclude_file_name_regexp--sc_require_config_h_first = ^plugin/
+exclude_file_name_regexp--sc_require_config_h = ^plugin/|src/gbinding\.c
+exclude_file_name_regexp--sc_require_config_h_first = ^plugin/|src/gbinding\.c
 
 exclude_file_name_regexp--sc_prohibit_empty_lines_at_EOF = ^icons/
 exclude_file_name_regexp--sc_trailing_blank = ^icons/
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 3065991..6b998e7 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -1,3 +1,4 @@
+src/gbinding.c
 src/remote-viewer-main.c
 src/remote-viewer.c
 [type: gettext/glade] src/virt-viewer-about.xml
diff --git a/src/Makefile.am b/src/Makefile.am
index c408cdd..abb8c15 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -8,7 +8,9 @@ builderxml_DATA =				\
 	virt-viewer-auth.xml			\
 	$(NULL)
 
-EXTRA_DIST = $(builderxml_DATA)
+EXTRA_DIST = $(builderxml_DATA) \
+	gbinding.c \
+	gbinding.h
 
 COMMON_SOURCES =					\
 	virt-viewer-util.h virt-viewer-util.c		\
diff --git a/src/gbinding.c b/src/gbinding.c
new file mode 100644
index 0000000..5b5757c
--- /dev/null
+++ b/src/gbinding.c
@@ -0,0 +1,1221 @@
+/* gbinding.c: Binding for object properties
+ *
+ * Copyright (C) 2010  Intel Corp.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Author: Emmanuele Bassi <ebassi@linux.intel.com>
+ */
+
+/**
+ * SECTION:gbinding
+ * @Title: GBinding
+ * @Short_Description: Bind two object properties
+ *
+ * #GBinding is the representation of a binding between a property on a
+ * #GObject instance (or source) and another property on another #GObject
+ * instance (or target). Whenever the source property changes, the same
+ * value is applied to the target property; for instance, the following
+ * binding:
+ *
+ * |[
+ *   g_object_bind_property (object1, "property-a",
+ *                           object2, "property-b",
+ *                           G_BINDING_DEFAULT);
+ * ]|
+ *
+ * will cause <emphasis>object2:property-b</emphasis> to be updated every
+ * time g_object_set() or the specific accessor changes the value of
+ * <emphasis>object1:property-a</emphasis>.
+ *
+ * It is possible to create a bidirectional binding between two properties
+ * of two #GObject instances, so that if either property changes, the
+ * other is updated as well, for instance:
+ *
+ * |[
+ *   g_object_bind_property (object1, "property-a",
+ *                           object2, "property-b",
+ *                           G_BINDING_BIDIRECTIONAL);
+ * ]|
+ *
+ * will keep the two properties in sync.
+ *
+ * It is also possible to set a custom transformation function (in both
+ * directions, in case of a bidirectional binding) to apply a custom
+ * transformation from the source value to the target value before
+ * applying it; for instance, the following binding:
+ *
+ * |[
+ *   g_object_bind_property_full (adjustment1, "value",
+ *                                adjustment2, "value",
+ *                                G_BINDING_BIDIRECTIONAL,
+ *                                celsius_to_fahrenheit,
+ *                                fahrenheit_to_celsius,
+ *                                NULL, NULL);
+ * ]|
+ *
+ * will keep the <emphasis>value</emphasis> property of the two adjustments
+ * in sync; the <function>celsius_to_fahrenheit</function> function will be
+ * called whenever the <emphasis>adjustment1:value</emphasis> property changes
+ * and will transform the current value of the property before applying it
+ * to the <emphasis>adjustment2:value</emphasis> property; vice versa, the
+ * <function>fahrenheit_to_celsius</function> function will be called whenever
+ * the <emphasis>adjustment2:value</emphasis> property changes, and will
+ * transform the current value of the property before applying it to the
+ * <emphasis>adjustment1:value</emphasis>.
+ *
+ * Note that #GBinding does not resolve cycles by itself; a cycle like
+ *
+ * |[
+ *   object1:propertyA -> object2:propertyB
+ *   object2:propertyB -> object3:propertyC
+ *   object3:propertyC -> object1:propertyA
+ * ]|
+ *
+ * might lead to an infinite loop. The loop, in this particular case,
+ * can be avoided if the objects emit the #GObject::notify signal only
+ * if the value has effectively been changed. A binding is implemented
+ * using the #GObject::notify signal, so it is susceptible to all the
+ * various ways of blocking a signal emission, like g_signal_stop_emission()
+ * or g_signal_handler_block().
+ *
+ * A binding will be severed, and the resources it allocates freed, whenever
+ * either one of the #GObject instances it refers to are finalized, or when
+ * the #GBinding instance loses its last reference.
+ *
+ * #GBinding is available since GObject 2.26
+ */
+
+#include <string.h>
+
+#ifndef G_VALUE_INIT
+#define G_VALUE_INIT  { 0, { { 0 } } }
+#endif
+
+#define g_marshal_value_peek_boxed(v)    (v)->data[0].v_pointer
+
+static void
+g_cclosure_user_marshal_BOOLEAN__BOXED_BOXED (GClosure     *closure,
+                                              GValue       *return_value G_GNUC_UNUSED,
+                                              guint         n_param_values,
+                                              const GValue *param_values,
+                                              gpointer      invocation_hint G_GNUC_UNUSED,
+                                              gpointer      marshal_data)
+{
+  typedef gboolean (*GMarshalFunc_BOOLEAN__BOXED_BOXED) (gpointer     data1,
+                                                         gpointer     arg_1,
+                                                         gpointer     arg_2,
+                                                         gpointer     data2);
+  register GMarshalFunc_BOOLEAN__BOXED_BOXED callback;
+  register GCClosure *cc = (GCClosure*) closure;
+  register gpointer data1, data2;
+  gboolean v_return;
+
+  g_return_if_fail (return_value != NULL);
+  g_return_if_fail (n_param_values == 3);
+
+  if (G_CCLOSURE_SWAP_DATA (closure))
+    {
+      data1 = closure->data;
+      data2 = g_value_peek_pointer (param_values + 0);
+    }
+  else
+    {
+      data1 = g_value_peek_pointer (param_values + 0);
+      data2 = closure->data;
+    }
+  callback = (GMarshalFunc_BOOLEAN__BOXED_BOXED) (marshal_data ? marshal_data : cc->callback);
+
+  v_return = callback (data1,
+                       g_marshal_value_peek_boxed (param_values + 1),
+                       g_marshal_value_peek_boxed (param_values + 2),
+                       data2);
+
+  g_value_set_boolean (return_value, v_return);
+}
+
+GType
+g_binding_flags_get_type (void)
+{
+  static volatile gsize g_define_type_id__volatile = 0;
+
+  if (g_once_init_enter (&g_define_type_id__volatile))
+    {
+      static const GFlagsValue values[] = {
+        { G_BINDING_DEFAULT, "G_BINDING_DEFAULT", "default" },
+        { G_BINDING_BIDIRECTIONAL, "G_BINDING_BIDIRECTIONAL", "bidirectional" },
+        { G_BINDING_SYNC_CREATE, "G_BINDING_SYNC_CREATE", "sync-create" },
+        { G_BINDING_INVERT_BOOLEAN, "G_BINDING_INVERT_BOOLEAN", "invert-boolean" },
+        { 0, NULL, NULL }
+      };
+      GType g_define_type_id =
+        g_flags_register_static (g_intern_static_string ("GBindingFlags"), values);
+      g_once_init_leave (&g_define_type_id__volatile, g_define_type_id);
+    }
+
+  return g_define_type_id__volatile;
+}
+
+#define G_BINDING_CLASS(klass)          (G_TYPE_CHECK_CLASS_CAST ((klass), G_TYPE_BINDING, GBindingClass))
+#define G_IS_BINDING_CLASS(klass)       (G_TYPE_CHECK_CLASS_TYPE ((klass), G_TYPE_BINDING))
+#define G_BINDING_GET_CLASS(obj)        (G_TYPE_INSTANCE_GET_CLASS ((obj), G_TYPE_BINDING, GBindingClass))
+
+typedef struct _GBindingClass           GBindingClass;
+
+struct _GBinding
+{
+  GObject parent_instance;
+
+  /* no reference is held on the objects, to avoid cycles */
+  GObject *source;
+  GObject *target;
+
+  /* the property names are interned, so they should not be freed */
+  const gchar *source_property;
+  const gchar *target_property;
+
+  GParamSpec *source_pspec;
+  GParamSpec *target_pspec;
+
+  GBindingTransformFunc transform_s2t;
+  GBindingTransformFunc transform_t2s;
+
+  GBindingFlags flags;
+
+  guint source_notify;
+  guint target_notify;
+
+  gpointer transform_data;
+  GDestroyNotify notify;
+
+  /* a guard, to avoid loops */
+  guint is_frozen : 1;
+};
+
+struct _GBindingClass
+{
+  GObjectClass parent_class;
+};
+
+enum
+{
+  PROP_00,
+
+  PROP_SOURCE,
+  PROP_TARGET,
+  PROP_SOURCE_PROPERTY,
+  PROP_TARGET_PROPERTY,
+  PROP_FLAGS
+};
+
+static GQuark quark_gbinding = 0;
+
+G_DEFINE_TYPE (GBinding, g_binding, G_TYPE_OBJECT);
+
+static inline void
+add_binding_qdata (GObject  *gobject,
+                   GBinding *binding)
+{
+  GHashTable *bindings;
+
+  bindings = g_object_get_qdata (gobject, quark_gbinding);
+  if (bindings == NULL)
+    {
+      bindings = g_hash_table_new (NULL, NULL);
+
+      g_object_set_qdata_full (gobject, quark_gbinding,
+                               bindings,
+                               (GDestroyNotify) g_hash_table_destroy);
+    }
+
+  g_hash_table_insert (bindings, binding, GUINT_TO_POINTER (1));
+}
+
+static inline void
+remove_binding_qdata (GObject  *gobject,
+                      GBinding *binding)
+{
+  GHashTable *bindings;
+
+  bindings = g_object_get_qdata (gobject, quark_gbinding);
+  g_hash_table_remove (bindings, binding);
+}
+
+/* the basic assumption is that if either the source or the target
+ * goes away then the binding does not exist any more and it should
+ * be reaped as well
+ */
+static void
+weak_unbind (gpointer  user_data,
+             GObject  *where_the_object_was)
+{
+  GBinding *binding = user_data;
+
+  /* if what went away was the source, unset it so that GBinding::finalize
+   * does not try to access it; otherwise, disconnect everything and remove
+   * the GBinding instance from the object's qdata
+   */
+  if (binding->source == where_the_object_was)
+    binding->source = NULL;
+  else
+    {
+      if (binding->source_notify != 0)
+        g_signal_handler_disconnect (binding->source, binding->source_notify);
+
+      g_object_weak_unref (binding->source, weak_unbind, user_data);
+      remove_binding_qdata (binding->source, binding);
+      binding->source = NULL;
+    }
+
+  /* as above, but with the target */
+  if (binding->target == where_the_object_was)
+    binding->target = NULL;
+  else
+    {
+      if (binding->target_notify != 0)
+        g_signal_handler_disconnect (binding->target, binding->target_notify);
+
+      g_object_weak_unref (binding->target, weak_unbind, user_data);
+      remove_binding_qdata (binding->target, binding);
+      binding->target = NULL;
+    }
+
+  /* this will take care of the binding itself */
+  g_object_unref (binding);
+}
+
+static inline gboolean
+default_transform (const GValue *value_a,
+                   GValue       *value_b)
+{
+  /* if it's not the same type, try to convert it using the GValue
+   * transformation API; otherwise just copy it
+   */
+  if (!g_type_is_a (G_VALUE_TYPE (value_a), G_VALUE_TYPE (value_b)))
+    {
+      /* are these two types compatible (can be directly copied)? */
+      if (g_value_type_compatible (G_VALUE_TYPE (value_a),
+                                   G_VALUE_TYPE (value_b)))
+        {
+          g_value_copy (value_a, value_b);
+          goto done;
+        }
+
+      if (g_value_type_transformable (G_VALUE_TYPE (value_a),
+                                      G_VALUE_TYPE (value_b)))
+        {
+          if (g_value_transform (value_a, value_b))
+            goto done;
+
+          g_warning ("%s: Unable to convert a value of type %s to a "
+                     "value of type %s",
+                     G_STRLOC,
+                     g_type_name (G_VALUE_TYPE (value_a)),
+                     g_type_name (G_VALUE_TYPE (value_b)));
+
+          return FALSE;
+        }
+    }
+  else
+    g_value_copy (value_a, value_b);
+
+done:
+  return TRUE;
+}
+
+static inline gboolean
+default_invert_boolean_transform (const GValue *value_a,
+                                  GValue       *value_b)
+{
+  gboolean value;
+
+  g_assert (G_VALUE_HOLDS_BOOLEAN (value_a));
+  g_assert (G_VALUE_HOLDS_BOOLEAN (value_b));
+
+  value = g_value_get_boolean (value_a);
+  value = !value;
+
+  g_value_set_boolean (value_b, value);
+
+  return TRUE;
+}
+
+static gboolean
+default_transform_to (GBinding     *binding,
+                      const GValue *value_a,
+                      GValue       *value_b,
+                      gpointer      user_data G_GNUC_UNUSED)
+{
+  if (binding->flags & G_BINDING_INVERT_BOOLEAN)
+    return default_invert_boolean_transform (value_a, value_b);
+
+  return default_transform (value_a, value_b);
+}
+
+static gboolean
+default_transform_from (GBinding     *binding,
+                        const GValue *value_a,
+                        GValue       *value_b,
+                        gpointer      user_data G_GNUC_UNUSED)
+{
+  if (binding->flags & G_BINDING_INVERT_BOOLEAN)
+    return default_invert_boolean_transform (value_a, value_b);
+
+  return default_transform (value_a, value_b);
+}
+
+static void
+on_source_notify (GObject    *gobject,
+                  GParamSpec *pspec,
+                  GBinding   *binding)
+{
+  const gchar *p_name;
+  GValue source_value = G_VALUE_INIT;
+  GValue target_value = G_VALUE_INIT;
+  gboolean res;
+
+  if (binding->is_frozen)
+    return;
+
+  p_name = g_intern_string (pspec->name);
+
+  if (p_name != binding->source_property)
+    return;
+
+  g_value_init (&source_value, G_PARAM_SPEC_VALUE_TYPE (binding->source_pspec));
+  g_value_init (&target_value, G_PARAM_SPEC_VALUE_TYPE (binding->target_pspec));
+
+  g_object_get_property (binding->source, binding->source_pspec->name, &source_value);
+
+  res = binding->transform_s2t (binding,
+                                &source_value,
+                                &target_value,
+                                binding->transform_data);
+  if (res)
+    {
+      binding->is_frozen = TRUE;
+
+      g_param_value_validate (binding->target_pspec, &target_value);
+      g_object_set_property (binding->target, binding->target_pspec->name, &target_value);
+
+      binding->is_frozen = FALSE;
+    }
+
+  g_value_unset (&source_value);
+  g_value_unset (&target_value);
+}
+
+static void
+on_target_notify (GObject    *gobject,
+                  GParamSpec *pspec,
+                  GBinding   *binding)
+{
+  const gchar *p_name;
+  GValue source_value = G_VALUE_INIT;
+  GValue target_value = G_VALUE_INIT;
+  gboolean res;
+
+  if (binding->is_frozen)
+    return;
+
+  p_name = g_intern_string (pspec->name);
+
+  if (p_name != binding->target_property)
+    return;
+
+  g_value_init (&source_value, G_PARAM_SPEC_VALUE_TYPE (binding->target_pspec));
+  g_value_init (&target_value, G_PARAM_SPEC_VALUE_TYPE (binding->source_pspec));
+
+  g_object_get_property (binding->target, binding->target_pspec->name, &source_value);
+
+  res = binding->transform_t2s (binding,
+                                &source_value,
+                                &target_value,
+                                binding->transform_data);
+  if (res)
+    {
+      binding->is_frozen = TRUE;
+
+      g_param_value_validate (binding->source_pspec, &target_value);
+      g_object_set_property (binding->source, binding->source_pspec->name, &target_value);
+
+      binding->is_frozen = FALSE;
+    }
+
+  g_value_unset (&source_value);
+  g_value_unset (&target_value);
+}
+
+static void
+g_binding_finalize (GObject *gobject)
+{
+  GBinding *binding = G_BINDING (gobject);
+
+  /* dispose of the transformation data */
+  if (binding->notify != NULL)
+    {
+      binding->notify (binding->transform_data);
+
+      binding->transform_data = NULL;
+      binding->notify = NULL;
+    }
+
+  /* we need this in case the source and target instance are still
+   * valid, and it was the GBinding that was unreferenced
+   */
+  if (binding->source != NULL)
+    {
+      if (binding->source_notify != 0)
+        g_signal_handler_disconnect (binding->source, binding->source_notify);
+
+      g_object_weak_unref (binding->source, weak_unbind, binding);
+      remove_binding_qdata (binding->source, binding);
+    }
+
+  if (binding->target != NULL)
+    {
+      if (binding->target_notify != 0)
+        g_signal_handler_disconnect (binding->target, binding->target_notify);
+
+      g_object_weak_unref (binding->target, weak_unbind, binding);
+      remove_binding_qdata (binding->target, binding);
+    }
+
+  G_OBJECT_CLASS (g_binding_parent_class)->finalize (gobject);
+}
+
+static void
+g_binding_set_property (GObject      *gobject,
+                        guint         prop_id,
+                        const GValue *value,
+                        GParamSpec   *pspec)
+{
+  GBinding *binding = G_BINDING (gobject);
+
+  switch (prop_id)
+    {
+    case PROP_SOURCE:
+      binding->source = g_value_get_object (value);
+      break;
+
+    case PROP_SOURCE_PROPERTY:
+      binding->source_property = g_intern_string (g_value_get_string (value));
+      break;
+
+    case PROP_TARGET:
+      binding->target = g_value_get_object (value);
+      break;
+
+    case PROP_TARGET_PROPERTY:
+      binding->target_property = g_intern_string (g_value_get_string (value));
+      break;
+
+    case PROP_FLAGS:
+      binding->flags = g_value_get_flags (value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
+      break;
+    }
+}
+
+static void
+g_binding_get_property (GObject    *gobject,
+                        guint       prop_id,
+                        GValue     *value,
+                        GParamSpec *pspec)
+{
+  GBinding *binding = G_BINDING (gobject);
+
+  switch (prop_id)
+    {
+    case PROP_SOURCE:
+      g_value_set_object (value, binding->source);
+      break;
+
+    case PROP_SOURCE_PROPERTY:
+      g_value_set_string (value, binding->source_property);
+      break;
+
+    case PROP_TARGET:
+      g_value_set_object (value, binding->target);
+      break;
+
+    case PROP_TARGET_PROPERTY:
+      g_value_set_string (value, binding->target_property);
+      break;
+
+    case PROP_FLAGS:
+      g_value_set_flags (value, binding->flags);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
+      break;
+    }
+}
+
+static void
+g_binding_constructed (GObject *gobject)
+{
+  GBinding *binding = G_BINDING (gobject);
+
+  /* assert that we were constructed correctly */
+  g_assert (binding->source != NULL);
+  g_assert (binding->target != NULL);
+  g_assert (binding->source_property != NULL);
+  g_assert (binding->target_property != NULL);
+
+  /* we assume a check was performed prior to construction - since
+   * g_object_bind_property_full() does it; we cannot fail construction
+   * anyway, so it would be hard for use to properly warn here
+   */
+  binding->source_pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (binding->source), binding->source_property);
+  binding->target_pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (binding->target), binding->target_property);
+  g_assert (binding->source_pspec != NULL);
+  g_assert (binding->target_pspec != NULL);
+
+  /* set the default transformation functions here */
+  binding->transform_s2t = default_transform_to;
+  binding->transform_t2s = default_transform_from;
+
+  binding->transform_data = NULL;
+  binding->notify = NULL;
+
+  binding->source_notify = g_signal_connect (binding->source, "notify",
+                                             G_CALLBACK (on_source_notify),
+                                             binding);
+
+  g_object_weak_ref (binding->source, weak_unbind, binding);
+  add_binding_qdata (binding->source, binding);
+
+  if (binding->flags & G_BINDING_BIDIRECTIONAL)
+    binding->target_notify = g_signal_connect (binding->target, "notify",
+                                               G_CALLBACK (on_target_notify),
+                                               binding);
+
+  g_object_weak_ref (binding->target, weak_unbind, binding);
+  add_binding_qdata (binding->target, binding);
+
+}
+
+static void
+g_binding_class_init (GBindingClass *klass)
+{
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+
+  quark_gbinding = g_quark_from_static_string ("g-binding");
+
+  gobject_class->constructed = g_binding_constructed;
+  gobject_class->set_property = g_binding_set_property;
+  gobject_class->get_property = g_binding_get_property;
+  gobject_class->finalize = g_binding_finalize;
+
+  /**
+   * GBinding:source:
+   *
+   * The #GObject that should be used as the source of the binding
+   *
+   * Since: 2.26
+   */
+  g_object_class_install_property (gobject_class, PROP_SOURCE,
+                                   g_param_spec_object ("source",
+                                                        _("Source"),
+                                                        _("The source of the binding"),
+                                                        G_TYPE_OBJECT,
+                                                        G_PARAM_CONSTRUCT_ONLY |
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_STATIC_STRINGS));
+  /**
+   * GBinding:target:
+   *
+   * The #GObject that should be used as the target of the binding
+   *
+   * Since: 2.26
+   */
+  g_object_class_install_property (gobject_class, PROP_TARGET,
+                                   g_param_spec_object ("target",
+                                                        _("Target"),
+                                                        _("The target of the binding"),
+                                                        G_TYPE_OBJECT,
+                                                        G_PARAM_CONSTRUCT_ONLY |
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_STATIC_STRINGS));
+  /**
+   * GBinding:source-property:
+   *
+   * The name of the property of #GBinding:source that should be used
+   * as the source of the binding
+   *
+   * Since: 2.26
+   */
+  g_object_class_install_property (gobject_class, PROP_SOURCE_PROPERTY,
+                                   g_param_spec_string ("source-property",
+                                                        _("Source Property"),
+                                                        _("The property on the source to bind"),
+                                                        NULL,
+                                                        G_PARAM_CONSTRUCT_ONLY |
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_STATIC_STRINGS));
+  /**
+   * GBinding:target-property:
+   *
+   * The name of the property of #GBinding:target that should be used
+   * as the target of the binding
+   *
+   * Since: 2.26
+   */
+  g_object_class_install_property (gobject_class, PROP_TARGET_PROPERTY,
+                                   g_param_spec_string ("target-property",
+                                                        _("Target Property"),
+                                                        _("The property on the target to bind"),
+                                                        NULL,
+                                                        G_PARAM_CONSTRUCT_ONLY |
+                                                        G_PARAM_READWRITE |
+                                                        G_PARAM_STATIC_STRINGS));
+  /**
+   * GBinding:flags:
+   *
+   * Flags to be used to control the #GBinding
+   *
+   * Since: 2.26
+   */
+  g_object_class_install_property (gobject_class, PROP_FLAGS,
+                                   g_param_spec_flags ("flags",
+                                                       _("Flags"),
+                                                       _("The binding flags"),
+                                                       G_TYPE_BINDING_FLAGS,
+                                                       G_BINDING_DEFAULT,
+                                                       G_PARAM_CONSTRUCT_ONLY |
+                                                       G_PARAM_READWRITE |
+                                                       G_PARAM_STATIC_STRINGS));
+}
+
+static void
+g_binding_init (GBinding *binding)
+{
+}
+
+/**
+ * g_binding_get_flags:
+ * @binding: a #GBinding
+ *
+ * Retrieves the flags passed when constructing the #GBinding
+ *
+ * Return value: the #GBindingFlags used by the #GBinding
+ *
+ * Since: 2.26
+ */
+GBindingFlags
+g_binding_get_flags (GBinding *binding)
+{
+  g_return_val_if_fail (G_IS_BINDING (binding), G_BINDING_DEFAULT);
+
+  return binding->flags;
+}
+
+/**
+ * g_binding_get_source:
+ * @binding: a #GBinding
+ *
+ * Retrieves the #GObject instance used as the source of the binding
+ *
+ * Return value: (transfer none): the source #GObject
+ *
+ * Since: 2.26
+ */
+GObject *
+g_binding_get_source (GBinding *binding)
+{
+  g_return_val_if_fail (G_IS_BINDING (binding), NULL);
+
+  return binding->source;
+}
+
+/**
+ * g_binding_get_target:
+ * @binding: a #GBinding
+ *
+ * Retrieves the #GObject instance used as the target of the binding
+ *
+ * Return value: (transfer none): the target #GObject
+ *
+ * Since: 2.26
+ */
+GObject *
+g_binding_get_target (GBinding *binding)
+{
+  g_return_val_if_fail (G_IS_BINDING (binding), NULL);
+
+  return binding->target;
+}
+
+/**
+ * g_binding_get_source_property:
+ * @binding: a #GBinding
+ *
+ * Retrieves the name of the property of #GBinding:source used as the source
+ * of the binding
+ *
+ * Return value: the name of the source property
+ *
+ * Since: 2.26
+ */
+const gchar *
+g_binding_get_source_property (GBinding *binding)
+{
+  g_return_val_if_fail (G_IS_BINDING (binding), NULL);
+
+  return binding->source_property;
+}
+
+/**
+ * g_binding_get_target_property:
+ * @binding: a #GBinding
+ *
+ * Retrieves the name of the property of #GBinding:target used as the target
+ * of the binding
+ *
+ * Return value: the name of the target property
+ *
+ * Since: 2.26
+ */
+const gchar *
+g_binding_get_target_property (GBinding *binding)
+{
+  g_return_val_if_fail (G_IS_BINDING (binding), NULL);
+
+  return binding->target_property;
+}
+
+/**
+ * g_object_bind_property_full:
+ * @source: (type GObject.Object): the source #GObject
+ * @source_property: the property on @source to bind
+ * @target: (type GObject.Object): the target #GObject
+ * @target_property: the property on @target to bind
+ * @flags: flags to pass to #GBinding
+ * @transform_to: (scope notified) (allow-none): the transformation function
+ *   from the @source to the @target, or %NULL to use the default
+ * @transform_from: (scope notified) (allow-none): the transformation function
+ *   from the @target to the @source, or %NULL to use the default
+ * @user_data: custom data to be passed to the transformation functions,
+ *   or %NULL
+ * @notify: function to be called when disposing the binding, to free the
+ *   resources used by the transformation functions
+ *
+ * Complete version of g_object_bind_property().
+ *
+ * Creates a binding between @source_property on @source and @target_property
+ * on @target, allowing you to set the transformation functions to be used by
+ * the binding.
+ *
+ * If @flags contains %G_BINDING_BIDIRECTIONAL then the binding will be mutual:
+ * if @target_property on @target changes then the @source_property on @source
+ * will be updated as well. The @transform_from function is only used in case
+ * of bidirectional bindings, otherwise it will be ignored
+ *
+ * The binding will automatically be removed when either the @source or the
+ * @target instances are finalized. To remove the binding without affecting the
+ * @source and the @target you can just call g_object_unref() on the returned
+ * #GBinding instance.
+ *
+ * A #GObject can have multiple bindings.
+ *
+ * <note>The same @user_data parameter will be used for both @transform_to
+ * and @transform_from transformation functions; the @notify function will
+ * be called once, when the binding is removed. If you need different data
+ * for each transformation function, please use
+ * g_object_bind_property_with_closures() instead.</note>
+ *
+ * Return value: (transfer none): the #GBinding instance representing the
+ *   binding between the two #GObject instances. The binding is released
+ *   whenever the #GBinding reference count reaches zero.
+ *
+ * Since: 2.26
+ */
+GBinding *
+g_object_bind_property_full (gpointer               source,
+                             const gchar           *source_property,
+                             gpointer               target,
+                             const gchar           *target_property,
+                             GBindingFlags          flags,
+                             GBindingTransformFunc  transform_to,
+                             GBindingTransformFunc  transform_from,
+                             gpointer               user_data,
+                             GDestroyNotify         notify)
+{
+  GParamSpec *pspec;
+  GBinding *binding;
+
+  g_return_val_if_fail (G_IS_OBJECT (source), NULL);
+  g_return_val_if_fail (source_property != NULL, NULL);
+  g_return_val_if_fail (G_IS_OBJECT (target), NULL);
+  g_return_val_if_fail (target_property != NULL, NULL);
+
+  if (source == target && g_strcmp0 (source_property, target_property) == 0)
+    {
+      g_warning ("Unable to bind the same property on the same instance");
+      return NULL;
+    }
+
+  /* remove the G_BINDING_INVERT_BOOLEAN flag in case we have
+   * custom transformation functions
+   */
+  if ((flags & G_BINDING_INVERT_BOOLEAN) &&
+      (transform_to != NULL || transform_from != NULL))
+    {
+      flags &= ~G_BINDING_INVERT_BOOLEAN;
+    }
+
+  pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (source), source_property);
+  if (pspec == NULL)
+    {
+      g_warning ("%s: The source object of type %s has no property called '%s'",
+                 G_STRLOC,
+                 G_OBJECT_TYPE_NAME (source),
+                 source_property);
+      return NULL;
+    }
+
+  if (!(pspec->flags & G_PARAM_READABLE))
+    {
+      g_warning ("%s: The source object of type %s has no readable property called '%s'",
+                 G_STRLOC,
+                 G_OBJECT_TYPE_NAME (source),
+                 source_property);
+      return NULL;
+    }
+
+  if ((flags & G_BINDING_BIDIRECTIONAL) &&
+      ((pspec->flags & G_PARAM_CONSTRUCT_ONLY) || !(pspec->flags & G_PARAM_WRITABLE)))
+    {
+      g_warning ("%s: The source object of type %s has no writable property called '%s'",
+                 G_STRLOC,
+                 G_OBJECT_TYPE_NAME (source),
+                 source_property);
+      return NULL;
+    }
+
+  if ((flags & G_BINDING_INVERT_BOOLEAN) &&
+      !(G_PARAM_SPEC_VALUE_TYPE (pspec) == G_TYPE_BOOLEAN))
+    {
+      g_warning ("%s: The G_BINDING_INVERT_BOOLEAN flag can only be used "
+                 "when binding boolean properties; the source property '%s' "
+                 "is of type '%s'",
+                 G_STRLOC,
+                 source_property,
+                 g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)));
+      return NULL;
+    }
+
+  pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (target), target_property);
+  if (pspec == NULL)
+    {
+      g_warning ("%s: The target object of type %s has no property called '%s'",
+                 G_STRLOC,
+                 G_OBJECT_TYPE_NAME (target),
+                 target_property);
+      return NULL;
+    }
+
+  if ((pspec->flags & G_PARAM_CONSTRUCT_ONLY) || !(pspec->flags & G_PARAM_WRITABLE))
+    {
+      g_warning ("%s: The target object of type %s has no writable property called '%s'",
+                 G_STRLOC,
+                 G_OBJECT_TYPE_NAME (target),
+                 target_property);
+      return NULL;
+    }
+
+  if ((flags & G_BINDING_BIDIRECTIONAL) &&
+      !(pspec->flags & G_PARAM_READABLE))
+    {
+      g_warning ("%s: The target object of type %s has no readable property called '%s'",
+                 G_STRLOC,
+                 G_OBJECT_TYPE_NAME (target),
+                 target_property);
+      return NULL;
+    }
+
+  if ((flags & G_BINDING_INVERT_BOOLEAN) &&
+      !(G_PARAM_SPEC_VALUE_TYPE (pspec) == G_TYPE_BOOLEAN))
+    {
+      g_warning ("%s: The G_BINDING_INVERT_BOOLEAN flag can only be used "
+                 "when binding boolean properties; the target property '%s' "
+                 "is of type '%s'",
+                 G_STRLOC,
+                 target_property,
+                 g_type_name (G_PARAM_SPEC_VALUE_TYPE (pspec)));
+      return NULL;
+    }
+
+  binding = g_object_new (G_TYPE_BINDING,
+                          "source", source,
+                          "source-property", source_property,
+                          "target", target,
+                          "target-property", target_property,
+                          "flags", flags,
+                          NULL);
+
+  if (transform_to != NULL)
+    binding->transform_s2t = transform_to;
+
+  if (transform_from != NULL)
+    binding->transform_t2s = transform_from;
+
+  binding->transform_data = user_data;
+  binding->notify = notify;
+
+  /* synchronize the target with the source by faking an emission of
+   * the ::notify signal for the source property; this will also take
+   * care of the bidirectional binding case because the eventual change
+   * will emit a notification on the target
+   */
+  if (flags & G_BINDING_SYNC_CREATE)
+    on_source_notify (binding->source, binding->source_pspec, binding);
+
+  return binding;
+}
+
+/**
+ * g_object_bind_property:
+ * @source: (type GObject.Object): the source #GObject
+ * @source_property: the property on @source to bind
+ * @target: (type GObject.Object): the target #GObject
+ * @target_property: the property on @target to bind
+ * @flags: flags to pass to #GBinding
+ *
+ * Creates a binding between @source_property on @source and @target_property
+ * on @target. Whenever the @source_property is changed the @target_property is
+ * updated using the same value. For instance:
+ *
+ * |[
+ *   g_object_bind_property (action, "active", widget, "sensitive", 0);
+ * ]|
+ *
+ * Will result in the "sensitive" property of the widget #GObject instance to be
+ * updated with the same value of the "active" property of the action #GObject
+ * instance.
+ *
+ * If @flags contains %G_BINDING_BIDIRECTIONAL then the binding will be mutual:
+ * if @target_property on @target changes then the @source_property on @source
+ * will be updated as well.
+ *
+ * The binding will automatically be removed when either the @source or the
+ * @target instances are finalized. To remove the binding without affecting the
+ * @source and the @target you can just call g_object_unref() on the returned
+ * #GBinding instance.
+ *
+ * A #GObject can have multiple bindings.
+ *
+ * Return value: (transfer none): the #GBinding instance representing the
+ *   binding between the two #GObject instances. The binding is released
+ *   whenever the #GBinding reference count reaches zero.
+ *
+ * Since: 2.26
+ */
+GBinding *
+g_object_bind_property (gpointer       source,
+                        const gchar   *source_property,
+                        gpointer       target,
+                        const gchar   *target_property,
+                        GBindingFlags  flags)
+{
+  /* type checking is done in g_object_bind_property_full() */
+
+  return g_object_bind_property_full (source, source_property,
+                                      target, target_property,
+                                      flags,
+                                      NULL,
+                                      NULL,
+                                      NULL, NULL);
+}
+
+typedef struct _TransformData
+{
+  GClosure *transform_to_closure;
+  GClosure *transform_from_closure;
+} TransformData;
+
+static gboolean
+bind_with_closures_transform_to (GBinding     *binding,
+                                 const GValue *source,
+                                 GValue       *target,
+                                 gpointer      data)
+{
+  TransformData *t_data = data;
+  GValue params[3] = { G_VALUE_INIT, G_VALUE_INIT, G_VALUE_INIT };
+  GValue retval = G_VALUE_INIT;
+  gboolean res;
+
+  g_value_init (&params[0], G_TYPE_BINDING);
+  g_value_set_object (&params[0], binding);
+
+  g_value_init (&params[1], G_TYPE_VALUE);
+  g_value_set_boxed (&params[1], source);
+
+  g_value_init (&params[2], G_TYPE_VALUE);
+  g_value_set_boxed (&params[2], target);
+
+  g_value_init (&retval, G_TYPE_BOOLEAN);
+  g_value_set_boolean (&retval, FALSE);
+
+  g_closure_invoke (t_data->transform_to_closure, &retval, 3, params, NULL);
+
+  res = g_value_get_boolean (&retval);
+  if (res)
+    {
+      const GValue *out_value = g_value_get_boxed (&params[2]);
+
+      g_assert (out_value != NULL);
+
+      g_value_copy (out_value, target);
+    }
+
+  g_value_unset (&params[0]);
+  g_value_unset (&params[1]);
+  g_value_unset (&params[2]);
+  g_value_unset (&retval);
+
+  return res;
+}
+
+static gboolean
+bind_with_closures_transform_from (GBinding     *binding,
+                                   const GValue *source,
+                                   GValue       *target,
+                                   gpointer      data)
+{
+  TransformData *t_data = data;
+  GValue params[3] = { G_VALUE_INIT, G_VALUE_INIT, G_VALUE_INIT };
+  GValue retval = G_VALUE_INIT;
+  gboolean res;
+
+  g_value_init (&params[0], G_TYPE_BINDING);
+  g_value_set_object (&params[0], binding);
+
+  g_value_init (&params[1], G_TYPE_VALUE);
+  g_value_set_boxed (&params[1], source);
+
+  g_value_init (&params[2], G_TYPE_VALUE);
+  g_value_set_boxed (&params[2], target);
+
+  g_value_init (&retval, G_TYPE_BOOLEAN);
+  g_value_set_boolean (&retval, FALSE);
+
+  g_closure_invoke (t_data->transform_from_closure, &retval, 3, params, NULL);
+
+  res = g_value_get_boolean (&retval);
+  if (res)
+    {
+      const GValue *out_value = g_value_get_boxed (&params[2]);
+
+      g_assert (out_value != NULL);
+
+      g_value_copy (out_value, target);
+    }
+
+  g_value_unset (&params[0]);
+  g_value_unset (&params[1]);
+  g_value_unset (&params[2]);
+  g_value_unset (&retval);
+
+  return res;
+}
+
+static void
+bind_with_closures_free_func (gpointer data)
+{
+  TransformData *t_data = data;
+
+  if (t_data->transform_to_closure != NULL)
+    g_closure_unref (t_data->transform_to_closure);
+
+  if (t_data->transform_from_closure != NULL)
+    g_closure_unref (t_data->transform_from_closure);
+
+  g_slice_free (TransformData, t_data);
+}
+
+/**
+ * g_object_bind_property_with_closures:
+ * @source: (type GObject.Object): the source #GObject
+ * @source_property: the property on @source to bind
+ * @target: (type GObject.Object): the target #GObject
+ * @target_property: the property on @target to bind
+ * @flags: flags to pass to #GBinding
+ * @transform_to: a #GClosure wrapping the transformation function
+ *   from the @source to the @target, or %NULL to use the default
+ * @transform_from: a #GClosure wrapping the transformation function
+ *   from the @target to the @source, or %NULL to use the default
+ *
+ * Creates a binding between @source_property on @source and @target_property
+ * on @target, allowing you to set the transformation functions to be used by
+ * the binding.
+ *
+ * This function is the language bindings friendly version of
+ * g_object_bind_property_full(), using #GClosure<!-- -->s instead of
+ * function pointers.
+ *
+ * Rename to: g_object_bind_property_full
+ *
+ * Return value: (transfer none): the #GBinding instance representing the
+ *   binding between the two #GObject instances. The binding is released
+ *   whenever the #GBinding reference count reaches zero.
+ *
+ * Since: 2.26
+ */
+GBinding *
+g_object_bind_property_with_closures (gpointer       source,
+                                      const gchar   *source_property,
+                                      gpointer       target,
+                                      const gchar   *target_property,
+                                      GBindingFlags  flags,
+                                      GClosure      *transform_to,
+                                      GClosure      *transform_from)
+{
+  TransformData *data;
+
+  data = g_slice_new0 (TransformData);
+
+  if (transform_to != NULL)
+    {
+      if (G_CLOSURE_NEEDS_MARSHAL (transform_to))
+        g_closure_set_marshal (transform_to, g_cclosure_user_marshal_BOOLEAN__BOXED_BOXED);
+
+      data->transform_to_closure = g_closure_ref (transform_to);
+      g_closure_sink (data->transform_to_closure);
+    }
+
+  if (transform_from != NULL)
+    {
+      if (G_CLOSURE_NEEDS_MARSHAL (transform_from))
+        g_closure_set_marshal (transform_from, g_cclosure_user_marshal_BOOLEAN__BOXED_BOXED);
+
+      data->transform_from_closure = g_closure_ref (transform_from);
+      g_closure_sink (data->transform_from_closure);
+    }
+
+  return g_object_bind_property_full (source, source_property,
+                                      target, target_property,
+                                      flags,
+                                      transform_to != NULL ? bind_with_closures_transform_to : NULL,
+                                      transform_from != NULL ? bind_with_closures_transform_from : NULL,
+                                      data,
+                                      bind_with_closures_free_func);
+}
diff --git a/src/gbinding.h b/src/gbinding.h
new file mode 100644
index 0000000..5e60c86
--- /dev/null
+++ b/src/gbinding.h
@@ -0,0 +1,129 @@
+/* gbinding.h: Binding for object properties
+ *
+ * Copyright (C) 2010  Intel Corp.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Author: Emmanuele Bassi <ebassi@linux.intel.com>
+ */
+
+#ifndef __G_BINDING_H__
+#define __G_BINDING_H__
+
+G_BEGIN_DECLS
+
+#define G_TYPE_BINDING_FLAGS    (g_binding_flags_get_type ())
+
+#define G_TYPE_BINDING          (g_binding_get_type ())
+#define G_BINDING(obj)          (G_TYPE_CHECK_INSTANCE_CAST ((obj), G_TYPE_BINDING, GBinding))
+#define G_IS_BINDING(obj)       (G_TYPE_CHECK_INSTANCE_TYPE ((obj), G_TYPE_BINDING))
+
+/**
+ * GBinding:
+ *
+ * <structname>GBinding</structname> is an opaque structure whose members
+ * cannot be accessed directly.
+ *
+ * Since: 2.26
+ */
+typedef struct _GBinding        GBinding;
+
+/**
+ * GBindingTransformFunc:
+ * @binding: a #GBinding
+ * @source_value: the value of the source property
+ * @target_value: the value of the target property
+ * @user_data: data passed to the transform function
+ *
+ * A function to be called to transform the source property of @source
+ * from @source_value into the target property of @target
+ * using @target_value.
+ *
+ * Return value: %TRUE if the transformation was successful, and %FALSE
+ *   otherwise
+ *
+ * Since: 2.26
+ */
+typedef gboolean (* GBindingTransformFunc) (GBinding     *binding,
+                                            const GValue *source_value,
+                                            GValue       *target_value,
+                                            gpointer      user_data);
+
+/**
+ * GBindingFlags:
+ * @G_BINDING_DEFAULT: The default binding; if the source property
+ *   changes, the target property is updated with its value.
+ * @G_BINDING_BIDIRECTIONAL: Bidirectional binding; if either the
+ *   property of the source or the property of the target changes,
+ *   the other is updated.
+ * @G_BINDING_SYNC_CREATE: Synchronize the values of the source and
+ *   target properties when creating the binding; the direction of
+ *   the synchronization is always from the source to the target.
+ * @G_BINDING_INVERT_BOOLEAN: If the two properties being bound are
+ *   booleans, setting one to %TRUE will result in the other being
+ *   set to %FALSE and vice versa. This flag will only work for
+ *   boolean properties, and cannot be used when passing custom
+ *   transformation functions to g_object_bind_property_full().
+ *
+ * Flags to be passed to g_object_bind_property() or
+ * g_object_bind_property_full().
+ *
+ * This enumeration can be extended at later date.
+ *
+ * Since: 2.26
+ */
+typedef enum { /*< prefix=G_BINDING >*/
+  G_BINDING_DEFAULT        = 0,
+
+  G_BINDING_BIDIRECTIONAL  = 1 << 0,
+  G_BINDING_SYNC_CREATE    = 1 << 1,
+  G_BINDING_INVERT_BOOLEAN = 1 << 2
+} GBindingFlags;
+
+GType                 g_binding_flags_get_type      (void) G_GNUC_CONST;
+GType                 g_binding_get_type            (void) G_GNUC_CONST;
+
+GBindingFlags         g_binding_get_flags           (GBinding *binding);
+GObject *             g_binding_get_source          (GBinding *binding);
+GObject *             g_binding_get_target          (GBinding *binding);
+const gchar *         g_binding_get_source_property (GBinding *binding);
+const gchar *         g_binding_get_target_property (GBinding *binding);
+
+GBinding *g_object_bind_property               (gpointer               source,
+                                                const gchar           *source_property,
+                                                gpointer               target,
+                                                const gchar           *target_property,
+                                                GBindingFlags          flags);
+GBinding *g_object_bind_property_full          (gpointer               source,
+                                                const gchar           *source_property,
+                                                gpointer               target,
+                                                const gchar           *target_property,
+                                                GBindingFlags          flags,
+                                                GBindingTransformFunc  transform_to,
+                                                GBindingTransformFunc  transform_from,
+                                                gpointer               user_data,
+                                                GDestroyNotify         notify);
+GBinding *g_object_bind_property_with_closures (gpointer               source,
+                                                const gchar           *source_property,
+                                                gpointer               target,
+                                                const gchar           *target_property,
+                                                GBindingFlags          flags,
+                                                GClosure              *transform_to,
+                                                GClosure              *transform_from);
+
+G_END_DECLS
+
+#endif /* __G_BINDING_H__ */
diff --git a/src/virt-viewer-session-spice.c b/src/virt-viewer-session-spice.c
index cc43bed..4b5edbf 100644
--- a/src/virt-viewer-session-spice.c
+++ b/src/virt-viewer-session-spice.c
@@ -34,6 +34,11 @@
 #include "virt-viewer-display-spice.h"
 #include "virt-viewer-auth.h"
 
+#if !GLIB_CHECK_VERSION(2, 26, 0)
+#include "gbinding.h"
+#include "gbinding.c"
+#endif
+
 G_DEFINE_TYPE (VirtViewerSessionSpice, virt_viewer_session_spice, VIRT_VIEWER_TYPE_SESSION)