gobject/gbinding.h

   1 /* gbinding.h: Binding for object properties
   2  *
   3  * Copyright (C) 2010  Intel Corp.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
  17  *
  18  * Author: Emmanuele Bassi <ebassi@linux.intel.com>
  19  */
  20
  21 #ifndef __G_BINDING_H__
  22 #define __G_BINDING_H__
  23
  24 #if !defined (__GLIB_GOBJECT_H_INSIDE__) && !defined (GOBJECT_COMPILATION)
  25 #error "Only <glib-object.h> can be included directly."
  26 #endif
  27
  28 #include <glib.h>
  29 #include <gobject/gobject.h>
  30
  31 G_BEGIN_DECLS
  32
  33 #define G_TYPE_BINDING_FLAGS    (g_binding_flags_get_type ())
  34
  35 #define G_TYPE_BINDING          (g_binding_get_type ())
  36 #define G_BINDING(obj)          (G_TYPE_CHECK_INSTANCE_CAST ((obj), G_TYPE_BINDING, GBinding))
  37 #define G_IS_BINDING(obj)       (G_TYPE_CHECK_INSTANCE_TYPE ((obj), G_TYPE_BINDING))
  38
  39 /**
  40  * GBinding:
  41  *
  42  * GBinding is an opaque structure whose members
  43  * cannot be accessed directly.
  44  *
  45  * Since: 2.26
  46  */
  47 typedef struct _GBinding        GBinding;
  48
  49 /**
  50  * GBindingTransformFunc:
  51  * @binding: a #GBinding
  52  * @from_value: the #GValue containing the value to transform
  53  * @to_value: the #GValue in which to store the transformed value
  54  * @user_data: data passed to the transform function
  55  *
  56  * A function to be called to transform @from_value to @to_value. If
  57  * this is the @transform_to function of a binding, then @from_value
  58  * is the @source_property on the @source object, and @to_value is the
  59  * @target_property on the @target object. If this is the
  60  * @transform_from function of a %G_BINDING_BIDIRECTIONAL binding,
  61  * then those roles are reversed.
  62  *
  63  * Returns: %TRUE if the transformation was successful, and %FALSE
  64  *   otherwise
  65  *
  66  * Since: 2.26
  67  */
  68 typedef gboolean (* GBindingTransformFunc) (GBinding     *binding,
  69                                             const GValue *from_value,
  70                                             GValue       *to_value,
  71                                             gpointer      user_data);
  72
  73 /**
  74  * GBindingFlags:
  75  * @G_BINDING_DEFAULT: The default binding; if the source property
  76  *   changes, the target property is updated with its value.
  77  * @G_BINDING_BIDIRECTIONAL: Bidirectional binding; if either the
  78  *   property of the source or the property of the target changes,
  79  *   the other is updated.
  80  * @G_BINDING_SYNC_CREATE: Synchronize the values of the source and
  81  *   target properties when creating the binding; the direction of
  82  *   the synchronization is always from the source to the target.
  83  * @G_BINDING_INVERT_BOOLEAN: If the two properties being bound are
  84  *   booleans, setting one to %TRUE will result in the other being
  85  *   set to %FALSE and vice versa. This flag will only work for
  86  *   boolean properties, and cannot be used when passing custom
  87  *   transformation functions to g_object_bind_property_full().
  88  *
  89  * Flags to be passed to g_object_bind_property() or
  90  * g_object_bind_property_full().
  91  *
  92  * This enumeration can be extended at later date.
  93  *
  94  * Since: 2.26
  95  */
  96 typedef enum { /*< prefix=G_BINDING >*/
  97   G_BINDING_DEFAULT        = 0,
  98
  99   G_BINDING_BIDIRECTIONAL  = 1 << 0,
 100   G_BINDING_SYNC_CREATE    = 1 << 1,
 101   G_BINDING_INVERT_BOOLEAN = 1 << 2
 102 } GBindingFlags;
 103
 104 GLIB_AVAILABLE_IN_ALL
 105 GType                 g_binding_flags_get_type      (void) G_GNUC_CONST;
 106 GLIB_AVAILABLE_IN_ALL
 107 GType                 g_binding_get_type            (void) G_GNUC_CONST;
 108
 109 GLIB_AVAILABLE_IN_ALL
 110 GBindingFlags         g_binding_get_flags           (GBinding *binding);
 111 GLIB_AVAILABLE_IN_ALL
 112 GObject *             g_binding_get_source          (GBinding *binding);
 113 GLIB_AVAILABLE_IN_ALL
 114 GObject *             g_binding_get_target          (GBinding *binding);
 115 GLIB_AVAILABLE_IN_ALL
 116 const gchar *         g_binding_get_source_property (GBinding *binding);
 117 GLIB_AVAILABLE_IN_ALL
 118 const gchar *         g_binding_get_target_property (GBinding *binding);
 119 GLIB_AVAILABLE_IN_2_38
 120 void                  g_binding_unbind              (GBinding *binding);
 121
 122 GLIB_AVAILABLE_IN_ALL
 123 GBinding *g_object_bind_property               (gpointer               source,
 124                                                 const gchar           *source_property,
 125                                                 gpointer               target,
 126                                                 const gchar           *target_property,
 127                                                 GBindingFlags          flags);
 128 GLIB_AVAILABLE_IN_ALL
 129 GBinding *g_object_bind_property_full          (gpointer               source,
 130                                                 const gchar           *source_property,
 131                                                 gpointer               target,
 132                                                 const gchar           *target_property,
 133                                                 GBindingFlags          flags,
 134                                                 GBindingTransformFunc  transform_to,
 135                                                 GBindingTransformFunc  transform_from,
 136                                                 gpointer               user_data,
 137                                                 GDestroyNotify         notify);
 138 GLIB_AVAILABLE_IN_ALL
 139 GBinding *g_object_bind_property_with_closures (gpointer               source,
 140                                                 const gchar           *source_property,
 141                                                 gpointer               target,
 142                                                 const gchar           *target_property,
 143                                                 GBindingFlags          flags,
 144                                                 GClosure              *transform_to,
 145                                                 GClosure              *transform_from);
 146
 147 G_END_DECLS
 148
 149 #endif /* __G_BINDING_H__ */