1 files changed, 118 insertions, 0 deletions
diff --git a/e-util/e-binding.h b/e-util/e-binding.h
new file mode 100644
index 0000000000..676093bfad
--- /dev/null
+++ b/e-util/e-binding.h
@@ -0,0 +1,118 @@
+/*
+ * e-binding.h
+ *
+ * This program 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) version 3.
+ *
+ * This program 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 the program; if not, see <http://www.gnu.org/licenses/>  
+ *
+ *
+ * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
+ *
+ */
+
+/* This is a direct rip-off of Xfce's excellent ExoBinding API,
+ * which binds two GObject properties together.  ExoBinding was
+ * written by Benedikt Meurer <benny@xfce.org>. */
+
+#ifndef E_BINDING_H
+#define E_BINDING_H
+
+#include <gdk/gdk.h>
+
+G_BEGIN_DECLS
+
+typedef struct _EBinding EBinding;
+typedef struct _EBindingBase EBindingBase;
+typedef struct _EBindingLink EBindingLink;
+typedef struct _EMutualBinding EMutualBinding;
+
+typedef gboolean	(*EBindingTransform)	(const GValue *src_value,
+						 GValue *dst_value,
+						 gpointer user_data);
+
+struct _EBindingBase {
+	GDestroyNotify destroy;
+};
+
+struct _EBindingLink {
+	GObject *dst_object;
+	GParamSpec *dst_pspec;
+	gulong dst_handler; /* only set for mutual bindings */
+	gulong handler;
+	EBindingTransform transform;
+	gpointer user_data;
+};
+
+struct _EBinding {
+	/*< private >*/
+	GObject *src_object;
+	EBindingBase base;
+	EBindingLink link;
+};
+
+struct _EMutualBinding {
+	/*< private >*/
+	EBindingBase  base;
+	EBindingLink  direct;
+	EBindingLink  reverse;
+};
+
+EBinding *	e_binding_new			(GObject *src_object,
+						 const gchar *src_property,
+						 GObject *dst_object,
+						 const gchar *dst_property);
+EBinding *	e_binding_new_full		(GObject *src_object,
+						 const gchar *src_property,
+						 GObject *dst_object,
+						 const gchar *dst_property,
+						 EBindingTransform transform,
+						 GDestroyNotify destroy_notify,
+						 gpointer user_data);
+EBinding *	e_binding_new_with_negation	(GObject *src_object,
+						 const gchar *src_property,
+						 GObject *dst_object,
+						 const gchar *dst_property);
+void		e_binding_unbind		(EBinding *binding);
+
+EMutualBinding *e_mutual_binding_new		(GObject *object1,
+						 const gchar *property1,
+						 GObject *object2,
+						 const gchar *property2);
+EMutualBinding *e_mutual_binding_new_full	(GObject *object1,
+						 const gchar *property1,
+						 GObject *object2,
+						 const gchar *property2,
+						 EBindingTransform transform,
+						 EBindingTransform reverse_transform,
+						 GDestroyNotify destroy_notify,
+						 gpointer user_data);
+EMutualBinding *e_mutual_binding_new_with_negation
+						(GObject *object1,
+						 const gchar *property1,
+						 GObject *object2,
+						 const gchar *property2);
+void		e_mutual_binding_unbind		(EMutualBinding *binding);
+
+
+/* Useful transformation functions */
+gboolean	e_binding_transform_color_to_string
+						(const GValue *src_value,
+						 GValue *dst_value,
+						 gpointer user_data);
+gboolean	e_binding_transform_string_to_color
+						(const GValue *src_value,
+						 GValue *dst_value,
+						 gpointer user_data);
+
+G_END_DECLS
+
+#endif /* E_BINDING_H */