1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
/*
* libMirage: object
* Copyright (C) 2006-2014 Rok Mandeljc
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/**
* SECTION: mirage-object
* @title: MirageObject
* @short_description: Base object class.
* @see_also: #MirageContext, #MirageContextual
* @include: mirage-object.h
*
* #MirageObject is used as a base object class throughout libMirage. It
* implements #MirageContextual interface, which allows attachment of
* #MirageContext. It also implements support for constructing parent-child
* hierarchy, which allows propagation of the #MirageContext and its changes
* from parent to the child objects.
*/
#include "mirage/config.h"
#include "mirage/mirage.h"
#include <glib/gi18n-lib.h>
/**********************************************************************\
* Private structure *
\**********************************************************************/
struct _MirageObjectPrivate
{
gpointer parent; /* Soft-reference (= no ref) to parent */
MirageContext *context;
};
/**********************************************************************\
* Debug context changes *
\**********************************************************************/
static void mirage_object_parent_context_changed_handler (MirageObject *self, MirageObject *parent)
{
/* Get the new context and set it */
MirageContext *context = mirage_contextual_get_context(MIRAGE_CONTEXTUAL(parent));
mirage_contextual_set_context(MIRAGE_CONTEXTUAL(self), context);
if (context) {
g_object_unref(context);
}
}
/**********************************************************************\
* Public API *
\**********************************************************************/
/**
* mirage_object_set_parent:
* @self: a #MirageObject
* @parent: (in) (allow-none) (type MirageObject): parent
*
* Sets object's parent. If @parent is %NULL, the object's parent is
* reset.
*/
void mirage_object_set_parent (MirageObject *self, gpointer parent)
{
if (self->priv->parent) {
/* Remove "debug-context-change" signal handler */
g_signal_handlers_disconnect_by_func(self->priv->parent, mirage_object_parent_context_changed_handler, self);
/* Remove previous weak reference pointer */
g_object_remove_weak_pointer(G_OBJECT(self->priv->parent), &self->priv->parent);
}
self->priv->parent = parent;
if (parent) {
/* Add weak pointer to parent */
g_object_add_weak_pointer(parent, &self->priv->parent);
/* Connect "*/
g_signal_connect_swapped(parent, "context-changed", (GCallback)mirage_object_parent_context_changed_handler, self);
/* Set parent's context by simulating the signal */
mirage_object_parent_context_changed_handler(self, parent);
}
}
/**
* mirage_object_get_parent:
* @self: a #MirageObject
*
* Returns pointer to object's parent object.
*
* Returns: (transfer full) (type MirageObject): parent object, or %NULL.
*/
gpointer mirage_object_get_parent (MirageObject *self)
{
if (self->priv->parent) {
g_object_ref(self->priv->parent);
}
return self->priv->parent;
}
/**********************************************************************\
* MirageContextual methods implementation *
\**********************************************************************/
static void mirage_object_set_context (MirageContextual *_self, MirageContext *context)
{
MirageObject *self = MIRAGE_OBJECT(_self);
if (context == self->priv->context) {
/* Don't do anything if we're trying to set the same context */
return;
}
/* If context is already set, free it */
if (self->priv->context) {
g_object_unref(self->priv->context);
self->priv->context = NULL;
}
/* Set context and ref it */
if (context) {
self->priv->context = g_object_ref(context);
}
/* Signal change, so that children object can pick it up */
g_signal_emit_by_name(self, "context-changed", NULL);
}
static MirageContext *mirage_object_get_context (MirageContextual *_self)
{
MirageObject *self = MIRAGE_OBJECT(_self);
if (self->priv->context) {
g_object_ref(self->priv->context);
}
return self->priv->context;
}
/**********************************************************************\
* Object init *
\**********************************************************************/
static void mirage_object_contextual_init (MirageContextualInterface *iface);
G_DEFINE_TYPE_WITH_CODE(MirageObject,
mirage_object,
G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE(MIRAGE_TYPE_CONTEXTUAL, mirage_object_contextual_init)
G_ADD_PRIVATE(MirageObject))
static void mirage_object_init (MirageObject *self)
{
self->priv = mirage_object_get_instance_private(self);
self->priv->parent = NULL;
self->priv->context = NULL;
}
static void mirage_object_dispose (GObject *gobject)
{
MirageObject *self = MIRAGE_OBJECT(gobject);
/* Remove weak reference pointer to parent */
if (self->priv->parent) {
g_signal_handlers_disconnect_by_func(self->priv->parent, mirage_object_parent_context_changed_handler, self);
g_object_remove_weak_pointer(G_OBJECT(self->priv->parent), &self->priv->parent);
self->priv->parent = NULL;
}
/* Unref context */
if (self->priv->context) {
g_object_unref(self->priv->context);
self->priv->context = NULL;
}
/* Chain up to the parent class */
return G_OBJECT_CLASS(mirage_object_parent_class)->dispose(gobject);
}
static void mirage_object_class_init (MirageObjectClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
gobject_class->dispose = mirage_object_dispose;
/* Signals */
/**
* MirageObject::context-changed:
* @object: a #MirageObject
*
* Emitted when a new #MirageContext is set to a #MirageObject.
*/
g_signal_new("context-changed", G_OBJECT_CLASS_TYPE(klass), G_SIGNAL_RUN_LAST, 0, NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0, NULL);
}
static void mirage_object_contextual_init (MirageContextualInterface *iface)
{
iface->set_context = mirage_object_set_context;
iface->get_context = mirage_object_get_context;
}
|
