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Binding Properties Functions

<!-- ##### SECTION Short_Description ##### -->
Functions used to bind two object properties together

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<para>
Binding properties is synchronizing values of several properties,
so that when one of the bound properties changes, the other
bound properties are automatically changed to the new value as
well. These functions eliminate the need to write property
change notification callbacks manually. It also increases the
reliability of your project as you don't need to repeat similar
code (and errors) manually.
</para>
<para>
Both uni-directional and mutual
bindings are supported and you can specify functions to perform
explicit transformation of values if required. Multiple properties
can be bound together in a complex way and infinite loops are
eliminated automatically.
</para>
<para>
For example, lets say, your program has a #GtkEntry widget that allows
the user to enter some text for the program, but this entry widget should
only be sensitive if a #GtkCheckButton is active.
</para>
<example>
<title>Connecting a <structname>GtkCheckButton</structname> and a
<structname>GtkEntry</structname></title>
<programlisting>
{
  GtkWidget *button;
  GtkWidget *entry;

  button = gtk_check_button_new_with_label ("Activate me");
  entry = gtk_entry_new ();

  exo_binding_new (G_OBJECT (button), "active",
                   G_OBJECT (entry), "sensitive");
  
  /* add button and entry to the gui... */
}
</programlisting>
</example>
<para>
As you can see, all you need to do is to call one function to connect
the sensitivity of the entry widget with the state of the check
button. No need to write signal handlers for this purpose any more.
</para>

<!-- ##### SECTION See_Also ##### -->
<para>
<ulink url="http://developer.gnome.org/doc/API/2.0/gobject/">GObject Reference
Manual</ulink>, <link linkend="exo-Extensions-to-GObject">Extensions to GObject</link>
</para>

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<!-- ##### STRUCT ExoBinding ##### -->
<para>
Opaque structure representing a one-way binding between two properties. It
is automatically removed if one of the bound objects is finalized.
</para>


<!-- ##### STRUCT ExoMutualBinding ##### -->
<para>
Opaque structure representing a mutual binding between two properties.
It is automatically freed if one of the bound objects is finalized.
</para>


<!-- ##### USER_FUNCTION ExoBindingTransform ##### -->
<para>
Function type used for binding transformation functions.
</para>
<para>
Accomplished transformation from @src_value to @dst_value.
@src_value and @dst_value are already initialized before
this function gets called.
</para>

@src_value: Value to transform.
@dst_value: Value to store the result of the transformation into.
@user_data: User data supplied at binding creation.
@Returns: %FALSE if transformation failed, else %TRUE.


<!-- ##### FUNCTION exo_binding_new ##### -->
<para>

</para>

@src_object: 
@src_property: 
@dst_object: 
@dst_property: 
@Returns: 


<!-- ##### FUNCTION exo_binding_new_full ##### -->
<para>

</para>

@src_object: 
@src_property: 
@dst_object: 
@dst_property: 
@transform: 
@destroy_notify: 
@user_data: 
@Returns: 


<!-- ##### FUNCTION exo_binding_new_with_negation ##### -->
<para>

</para>

@src_object: 
@src_property: 
@dst_object: 
@dst_property: 
@Returns: 


<!-- ##### FUNCTION exo_binding_unbind ##### -->
<para>

</para>

@binding: 


<!-- ##### FUNCTION exo_mutual_binding_new ##### -->
<para>

</para>

@object1: 
@property1: 
@object2: 
@property2: 
@Returns: 


<!-- ##### FUNCTION exo_mutual_binding_new_full ##### -->
<para>

</para>

@object1: 
@property1: 
@object2: 
@property2: 
@transform: 
@reverse_transform: 
@destroy_notify: 
@user_data: 
@Returns: 


<!-- ##### FUNCTION exo_mutual_binding_new_with_negation ##### -->
<para>

</para>

@object1: 
@property1: 
@object2: 
@property2: 
@Returns: 


<!-- ##### FUNCTION exo_mutual_binding_unbind ##### -->
<para>

</para>

@binding: 


