1 /* ADG - Automatic Drawing Generation
2 * Copyright (C) 2007,2008,2009,2010,2011 Nicola Fontana <ntd at entidi.it>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
22 * SECTION:adg-container
23 * @short_description: Base class for entity that can contain other entities
25 * The #AdgContainer is an entity that can contains more sub-entities.
26 * Moreover, it can apply a common transformation to local and/or global
27 * maps: see http://adg.entidi.com/tutorial/view/3 for further details.
29 * Adding an entity to a container will make a circular dependency
30 * between the two objects. The container will also add a weak reference
31 * to the child entity to intercept when the entity is manually
32 * destroyed (usually by calling g_object_unref()) and remove the child
33 * reference from the internal children list.
41 * All fields are private and should not be used directly.
42 * Use its public methods instead.
48 #include "adg-internal.h"
50 #include "adg-container.h"
51 #include "adg-container-private.h"
54 #define _ADG_PARENT_OBJECT_CLASS ((GObjectClass *) adg_container_parent_class)
55 #define _ADG_PARENT_ENTITY_CLASS ((AdgEntityClass *) adg_container_parent_class)
58 G_DEFINE_TYPE(AdgContainer
, adg_container
, ADG_TYPE_ENTITY
)
72 static void _adg_dispose (GObject
*object
);
73 static void _adg_set_property (GObject
*object
,
77 static void _adg_destroy (AdgEntity
*entity
);
78 static void _adg_global_changed (AdgEntity
*entity
);
79 static void _adg_local_changed (AdgEntity
*entity
);
80 static void _adg_invalidate (AdgEntity
*entity
);
81 static void _adg_arrange (AdgEntity
*entity
);
82 static void _adg_add_extents (AdgEntity
*entity
,
83 CpmlExtents
*extents
);
84 static void _adg_render (AdgEntity
*entity
,
86 static GSList
* _adg_children (AdgContainer
*container
);
87 static void _adg_add (AdgContainer
*container
,
89 static void _adg_remove (AdgContainer
*container
,
91 static void _adg_remove_from_list (gpointer container
,
94 static guint _adg_signals
[LAST_SIGNAL
] = { 0 };
98 adg_container_class_init(AdgContainerClass
*klass
)
100 GObjectClass
*gobject_class
;
101 AdgEntityClass
*entity_class
;
104 gobject_class
= (GObjectClass
*) klass
;
105 entity_class
= (AdgEntityClass
*) klass
;
107 g_type_class_add_private(klass
, sizeof(AdgContainerPrivate
));
109 gobject_class
->dispose
= _adg_dispose
;
110 gobject_class
->set_property
= _adg_set_property
;
112 entity_class
->destroy
= _adg_destroy
;
113 entity_class
->global_changed
= _adg_global_changed
;
114 entity_class
->local_changed
= _adg_local_changed
;
115 entity_class
->invalidate
= _adg_invalidate
;
116 entity_class
->arrange
= _adg_arrange
;
117 entity_class
->render
= _adg_render
;
119 klass
->children
= _adg_children
;
120 klass
->add
= _adg_add
;
121 klass
->remove
= _adg_remove
;
123 param
= g_param_spec_object("child",
125 P_("Can be used to add a new child to the container"),
128 g_object_class_install_property(gobject_class
, PROP_CHILD
, param
);
132 * @container: an #AdgContainer
133 * @entity: the #AdgEntity to add
135 * Adds @entity to @container. @entity must not be inside another
136 * container or the operation will fail.
140 _adg_signals
[ADD
] = g_signal_new("add",
141 G_OBJECT_CLASS_TYPE(gobject_class
),
143 G_STRUCT_OFFSET(AdgContainerClass
, add
),
145 adg_marshal_VOID__OBJECT
,
146 G_TYPE_NONE
, 1, ADG_TYPE_ENTITY
);
149 * AdgContainer::remove:
150 * @container: an #AdgContainer
151 * @entity: the #AdgEntity to remove
153 * Removes @entity from @container.
157 _adg_signals
[REMOVE
] = g_signal_new("remove",
158 G_OBJECT_CLASS_TYPE(gobject_class
),
160 G_STRUCT_OFFSET(AdgContainerClass
, remove
),
162 adg_marshal_VOID__OBJECT
,
163 G_TYPE_NONE
, 1, ADG_TYPE_ENTITY
);
167 adg_container_init(AdgContainer
*container
)
169 AdgContainerPrivate
*data
= G_TYPE_INSTANCE_GET_PRIVATE(container
,
171 AdgContainerPrivate
);
173 data
->children
= NULL
;
175 container
->data
= data
;
179 _adg_dispose(GObject
*object
)
181 AdgContainer
*container
;
182 AdgContainerPrivate
*data
;
184 container
= (AdgContainer
*) object
;
185 data
= container
->data
;
187 /* Remove all the children from the container: these will emit
188 * a "remove" signal for every child and will drop all the
189 * references from the children to this container (and, obviously,
190 * from the container to the children). */
191 while (data
->children
!= NULL
)
192 adg_container_remove(container
, (AdgEntity
*) data
->children
->data
);
194 if (_ADG_PARENT_OBJECT_CLASS
->dispose
)
195 _ADG_PARENT_OBJECT_CLASS
->dispose(object
);
199 _adg_set_property(GObject
*object
,
200 guint prop_id
, const GValue
*value
, GParamSpec
*pspec
)
202 AdgContainer
*container
= (AdgContainer
*) object
;
206 adg_container_add(container
, g_value_get_object(value
));
209 G_OBJECT_WARN_INVALID_PROPERTY_ID(object
, prop_id
, pspec
);
217 * Creates a new container entity.
219 * Returns: the newly created container entity
224 adg_container_new(void)
226 return g_object_new(ADG_TYPE_CONTAINER
, NULL
);
232 * @container: an #AdgContainer
233 * @entity: an #AdgEntity
235 * Emits a #AdgContainer::add signal on @container passing @entity
236 * as argument. @entity must be added to only one container at a time,
237 * you can't place the same entity inside two different containers.
239 * Once @entity has been added, the floating reference will be removed
240 * and @container will own a reference to @entity. This means the only
241 * proper way to destroy @entity is to call adg_container_remove().
246 adg_container_add(AdgContainer
*container
, AdgEntity
*entity
)
248 g_return_if_fail(ADG_IS_CONTAINER(container
));
249 g_return_if_fail(ADG_IS_ENTITY(entity
));
251 g_signal_emit(container
, _adg_signals
[ADD
], 0, entity
);
255 * adg_container_remove:
256 * @container: an #AdgContainer
257 * @entity: an #AdgEntity
259 * Emits a #AdgContainer::remove signal on @container passing
260 * @entity as argument. @entity must be inside @container.
262 * Note that @container will own a reference to @entity and it
263 * may be the last reference held: this means removing an entity
264 * from its container can destroy it.
266 * If you want to use @entity again, you need to add a reference
267 * to it, using g_object_ref(), before removing it from @container.
268 * The following typical example shows you how to properly move
269 * <varname>entity</varname> from <varname>container1</varname>
270 * to <varname>container2</varname>:
273 * g_object_ref(entity);
274 * adg_container_remove(container1, entity);
275 * adg_container_add(container2, entity)
276 * g_object_unref(entity);
282 adg_container_remove(AdgContainer
*container
, AdgEntity
*entity
)
284 g_return_if_fail(ADG_IS_CONTAINER(container
));
285 g_return_if_fail(ADG_IS_ENTITY(entity
));
287 g_signal_emit(container
, _adg_signals
[REMOVE
], 0, entity
);
291 * adg_container_children:
292 * @container: an #AdgContainer
294 * Gets the children list of @container. This list must be manually
295 * freed with g_slist_free() when no longer user.
297 * The returned list is ordered from the most recently added child
300 * Returns: (element-type AdgEntity) (transfer container): a newly allocated #GSList of #AdgEntity or %NULL empty list or on errors
305 adg_container_children(AdgContainer
*container
)
307 AdgContainerClass
*klass
;
309 g_return_val_if_fail(ADG_IS_CONTAINER(container
), NULL
);
311 klass
= ADG_CONTAINER_GET_CLASS(container
);
313 if (klass
->children
== NULL
)
316 return klass
->children(container
);
320 * adg_container_foreach:
321 * @container: an #AdgContainer
322 * @callback: (scope call): a callback
323 * @user_data: callback user data
325 * Invokes @callback on each child of @container.
326 * The callback should be declared as:
329 * void callback(AdgEntity *entity, gpointer user_data);
335 adg_container_foreach(AdgContainer
*container
,
336 GCallback callback
, gpointer user_data
)
340 g_return_if_fail(ADG_IS_CONTAINER(container
));
341 g_return_if_fail(callback
!= NULL
);
343 children
= adg_container_children(container
);
345 while (children
!= NULL
) {
346 if (children
->data
!= NULL
)
347 ((void (*) (gpointer
, gpointer
)) callback
) (children
->data
, user_data
);
349 children
= g_slist_delete_link(children
, children
);
354 * adg_container_propagate:
355 * @container: an #AdgContainer
356 * @signal_id: the signal id
357 * @detail: the detail
358 * @...: parameters to be passed to the signal, followed by a pointer
359 * to the allocated memory where to store the return type: if
360 * the signal is %G_TYPE_NONE (void return type), this trailing
361 * pointer should be omitted
363 * Emits the specified signal to all the children of @container
364 * using g_signal_emit_valist() calls.
369 adg_container_propagate(AdgContainer
*container
,
370 guint signal_id
, GQuark detail
, ...)
374 va_start(var_args
, detail
);
375 adg_container_propagate_valist(container
, signal_id
, detail
, var_args
);
380 * adg_container_propagate_by_name:
381 * @container: an #AdgContainer
382 * @detailed_signal: a string of the form "signal-name::detail".
383 * @...: parameters to be passed to the signal, followed by a pointer
384 * to the allocated memory where to store the return type: if
385 * the signal is %G_TYPE_NONE (void return type), this trailing
386 * pointer should be omitted
388 * Emits the specified signal to all the children of @container
389 * using g_signal_emit_valist() calls.
394 adg_container_propagate_by_name(AdgContainer
*container
,
395 const gchar
*detailed_signal
, ...)
401 if (!g_signal_parse_name(detailed_signal
, G_TYPE_FROM_INSTANCE(container
),
402 &signal_id
, &detail
, FALSE
)) {
403 g_warning(_("%s: signal `%s' is invalid for instance `%p'"),
404 G_STRLOC
, detailed_signal
, container
);
408 va_start(var_args
, detailed_signal
);
409 adg_container_propagate_valist(container
, signal_id
, detail
, var_args
);
414 * adg_container_propagate_valist:
415 * @container: an #AdgContainer
416 * @signal_id: the signal id
417 * @detail: the detail
418 * @var_args: parameters to be passed to the signal, followed by a
419 * pointer to the allocated memory where to store the
420 * return type: if the signal is %G_TYPE_NONE (void return
421 * type), this trailing pointer should be omitted
423 * Emits the specified signal to all the children of @container
424 * using g_signal_emit_valist() calls.
429 adg_container_propagate_valist(AdgContainer
*container
,
430 guint signal_id
, GQuark detail
, va_list var_args
)
435 g_return_if_fail(ADG_IS_CONTAINER(container
));
437 children
= adg_container_children(container
);
439 while (children
!= NULL
) {
440 if (children
->data
!= NULL
) {
441 G_VA_COPY(var_copy
, var_args
);
442 g_signal_emit_valist(children
->data
, signal_id
, detail
, var_copy
);
445 children
= g_slist_delete_link(children
, children
);
451 _adg_destroy(AdgEntity
*entity
)
453 adg_container_propagate_by_name((AdgContainer
*) entity
, "destroy");
455 if (_ADG_PARENT_ENTITY_CLASS
->destroy
)
456 _ADG_PARENT_ENTITY_CLASS
->destroy(entity
);
460 _adg_global_changed(AdgEntity
*entity
)
462 if (_ADG_PARENT_ENTITY_CLASS
->global_changed
)
463 _ADG_PARENT_ENTITY_CLASS
->global_changed(entity
);
465 adg_container_propagate_by_name((AdgContainer
*) entity
, "global-changed");
469 _adg_local_changed(AdgEntity
*entity
)
471 if (_ADG_PARENT_ENTITY_CLASS
->local_changed
)
472 _ADG_PARENT_ENTITY_CLASS
->local_changed(entity
);
474 adg_container_propagate_by_name((AdgContainer
*) entity
, "local-changed");
478 _adg_invalidate(AdgEntity
*entity
)
480 adg_container_propagate_by_name((AdgContainer
*) entity
, "invalidate");
484 _adg_arrange(AdgEntity
*entity
)
486 AdgContainer
*container
= (AdgContainer
*) entity
;
487 CpmlExtents extents
= { 0 };
489 adg_container_propagate_by_name(container
, "arrange", NULL
);
490 adg_container_foreach(container
, G_CALLBACK(_adg_add_extents
), &extents
);
491 adg_entity_set_extents(entity
, &extents
);
495 _adg_add_extents(AdgEntity
*entity
, CpmlExtents
*extents
)
497 cpml_extents_add(extents
, adg_entity_get_extents(entity
));
501 _adg_render(AdgEntity
*entity
, cairo_t
*cr
)
503 adg_container_propagate_by_name((AdgContainer
*) entity
, "render", cr
);
508 _adg_children(AdgContainer
*container
)
510 AdgContainerPrivate
*data
= container
->data
;
512 /* The NULL case is yet managed by GLib */
513 return g_slist_copy(data
->children
);
517 _adg_add(AdgContainer
*container
, AdgEntity
*entity
)
519 const AdgEntity
*old_parent
;
520 AdgContainerPrivate
*data
;
522 old_parent
= adg_entity_get_parent(entity
);
523 if (old_parent
!= NULL
) {
524 g_warning(_("Attempting to add an entity with type %s to a container "
525 "of type %s, but the entity is already inside a container "
527 g_type_name(G_OBJECT_TYPE(entity
)),
528 g_type_name(G_OBJECT_TYPE(container
)),
529 g_type_name(G_OBJECT_TYPE(old_parent
)));
533 data
= container
->data
;
534 data
->children
= g_slist_prepend(data
->children
, entity
);
536 g_object_ref_sink(entity
);
537 adg_entity_set_parent(entity
, (AdgEntity
*) container
);
538 g_object_weak_ref((GObject
*) entity
, _adg_remove_from_list
, container
);
542 _adg_remove_from_list(gpointer container
, GObject
*entity
)
544 AdgContainerPrivate
*data
= ((AdgContainer
*) container
)->data
;
545 data
->children
= g_slist_remove(data
->children
, entity
);
549 _adg_remove(AdgContainer
*container
, AdgEntity
*entity
)
551 AdgContainerPrivate
*data
;
554 data
= container
->data
;
555 node
= g_slist_find(data
->children
, entity
);
558 g_warning(_("Attempting to remove an entity with type %s from a "
559 "container of type %s, but the entity is not present"),
560 g_type_name(G_OBJECT_TYPE(entity
)),
561 g_type_name(G_OBJECT_TYPE(container
)));
565 g_object_weak_unref((GObject
*) entity
, _adg_remove_from_list
, container
);
566 data
->children
= g_slist_delete_link(data
->children
, node
);
567 adg_entity_set_parent(entity
, NULL
);
568 g_object_unref(entity
);