adg/adg-container.c

   1 /* ADG - Automatic Drawing Generation
   2  * Copyright (C) 2007-2008, Nicola Fontana <ntd at entidi.it>
   3  *
   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.
   8  *
   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.
  13  *
  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.
  18  */
  19
  20
  21 /**
  22  * SECTION:container
  23  * @title: AdgContainer
  24  * @short_description: Base class for entity that can contain other entities
  25  *
  26  * The #AdgContainer is an entity that can contains more sub-entities.
  27  * Each AdgContainer has its paper matrix (#AdgContainer:paper_matrix) to be
  28  * used on paper-dependent references (such as font and arrow sizes, line
  29  * thickness etc...) and a model matrix usually applied to the model view. See
  30  * http://www.entidi.it/adg/tutorial/view/3 for details on this topic.
  31  *
  32  * This means an AdgContainer can be thought as a group of entities with the
  33  * same geometrical identity (same scale, reference point ecc...).
  34  */
  35
  36 #include "adg-container.h"
  37 #include "adg-container-private.h"
  38 #include "adg-intl.h"
  39
  40 #define PARENT_CLASS ((AdgEntityClass *) adg_container_parent_class)
  41
  42
  43 enum {
  44     PROP_0,
  45     PROP_CHILD,
  46     PROP_MODEL_TRANSFORMATION,
  47     PROP_PAPER_TRANSFORMATION
  48 };
  49
  50 enum {
  51     ADD,
  52     REMOVE,
  53     LAST_SIGNAL
  54 };
  55
  56
  57 static void             get_property            (GObject        *object,
  58                                                  guint           prop_id,
  59                                                  GValue         *value,
  60                                                  GParamSpec     *pspec);
  61 static void             set_property            (GObject        *object,
  62                                                  guint           prop_id,
  63                                                  const GValue   *value,
  64                                                  GParamSpec     *pspec);
  65 static void             dispose                 (GObject        *object);
  66 static const AdgMatrix *get_model_matrix        (AdgEntity      *entity);
  67 static const AdgMatrix *get_paper_matrix        (AdgEntity      *entity);
  68 static void             model_matrix_changed    (AdgEntity      *entity,
  69                                                  AdgMatrix      *parent_matrix);
  70 static void             paper_matrix_changed    (AdgEntity      *entity,
  71                                                  AdgMatrix      *parent_matrix);
  72 static GSList *         get_children            (AdgContainer   *container);
  73 static gboolean         add                     (AdgContainer   *container,
  74                                                  AdgEntity      *entity);
  75 static void             real_add                (AdgContainer   *container,
  76                                                  AdgEntity      *entity,
  77                                                  gpointer        user_data);
  78 static gboolean         remove                  (AdgContainer   *container,
  79                                                  AdgEntity      *entity);
  80 static void             real_remove             (AdgContainer   *container,
  81                                                  AdgEntity      *entity,
  82                                                  gpointer        user_data);
  83 static void             invalidate              (AdgEntity      *entity);
  84 static void             render                  (AdgEntity      *entity,
  85                                                  cairo_t        *cr);
  86
  87 static guint signals[LAST_SIGNAL] = { 0 };
  88
  89
  90 G_DEFINE_TYPE(AdgContainer, adg_container, ADG_TYPE_ENTITY)
  91
  92
  93 static void
  94 adg_container_class_init(AdgContainerClass *klass)
  95 {
  96     GObjectClass *gobject_class;
  97     AdgEntityClass *entity_class;
  98     GParamSpec *param;
  99     GClosure *closure;
 100     GType param_types[1];
 101
 102     gobject_class = (GObjectClass *) klass;
 103     entity_class = (AdgEntityClass *) klass;
 104
 105     g_type_class_add_private(klass, sizeof(AdgContainerPrivate));
 106
 107     gobject_class->get_property = get_property;
 108     gobject_class->set_property = set_property;
 109     gobject_class->dispose = dispose;
 110
 111     entity_class->model_matrix_changed = model_matrix_changed;
 112     entity_class->paper_matrix_changed = paper_matrix_changed;
 113     entity_class->get_model_matrix = get_model_matrix;
 114     entity_class->get_paper_matrix = get_paper_matrix;
 115     entity_class->invalidate = invalidate;
 116     entity_class->render = render;
 117
 118     klass->get_children = get_children;
 119     klass->add = add;
 120     klass->remove = remove;
 121
 122     param = g_param_spec_boxed("child",
 123                                P_("Child"),
 124                                P_("Can be used to add a new child to the container"),
 125                                ADG_TYPE_ENTITY, G_PARAM_WRITABLE);
 126     g_object_class_install_property(gobject_class, PROP_CHILD, param);
 127
 128     param = g_param_spec_boxed("model-transformation",
 129                                P_("The model transformation"),
 130                                P_("The model transformation to be applied to this container and its children entities"),
 131                                ADG_TYPE_MATRIX, G_PARAM_READWRITE);
 132     g_object_class_install_property(gobject_class,
 133                                     PROP_MODEL_TRANSFORMATION, param);
 134
 135     param = g_param_spec_boxed("paper-transformation",
 136                                P_("The paper transformation"),
 137                                P_("The paper transformation to be applied to this container and its children entities"),
 138                                ADG_TYPE_MATRIX, G_PARAM_READWRITE);
 139     g_object_class_install_property(gobject_class,
 140                                     PROP_PAPER_TRANSFORMATION, param);
 141
 142     /**
 143      * AdgContainer::add:
 144      * @container: an #AdgContainer
 145      * @entity: the #AdgEntity to add
 146      *
 147      * Adds @entity to @container.
 148      **/
 149     closure = g_cclosure_new(G_CALLBACK(real_add), (gpointer)0xdeadbeaf, NULL);
 150     param_types[0] = G_TYPE_OBJECT;
 151     signals[ADD] = g_signal_newv("add", ADG_TYPE_CONTAINER,
 152                                  G_SIGNAL_RUN_FIRST, closure, NULL, NULL,
 153                                  g_cclosure_marshal_VOID__OBJECT,
 154                                  G_TYPE_NONE, 1, param_types);
 155
 156     /**
 157      * AdgContainer::remove:
 158      * @container: an #AdgContainer
 159      * @entity: the #AdgEntity to remove
 160      *
 161      * Removes @entity from @container.
 162      **/
 163     closure = g_cclosure_new(G_CALLBACK(real_remove), (gpointer)0xdeadbeaf, NULL);
 164     param_types[0] = G_TYPE_OBJECT;
 165     signals[REMOVE] = g_signal_newv("remove", ADG_TYPE_CONTAINER,
 166                                     G_SIGNAL_RUN_FIRST, closure, NULL, NULL,
 167                                     g_cclosure_marshal_VOID__OBJECT,
 168                                     G_TYPE_NONE, 1, param_types);
 169 }
 170
 171 static void
 172 adg_container_init(AdgContainer *container)
 173 {
 174     AdgContainerPrivate *priv = G_TYPE_INSTANCE_GET_PRIVATE(container,
 175                                                             ADG_TYPE_CONTAINER,
 176                                                             AdgContainerPrivate);
 177
 178     priv->children = NULL;
 179     cairo_matrix_init_identity(&priv->model_transformation);
 180     cairo_matrix_init_identity(&priv->paper_transformation);
 181     cairo_matrix_init_identity(&priv->model_matrix);
 182     cairo_matrix_init_identity(&priv->paper_matrix);
 183
 184     container->priv = priv;
 185 }
 186
 187 static void
 188 get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
 189 {
 190     AdgContainer *container = (AdgContainer *) object;
 191
 192     switch (prop_id) {
 193     case PROP_MODEL_TRANSFORMATION:
 194         g_value_set_boxed(value, &container->priv->model_transformation);
 195         break;
 196     case PROP_PAPER_TRANSFORMATION:
 197         g_value_set_boxed(value, &container->priv->paper_transformation);
 198         break;
 199     default:
 200         G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
 201         break;
 202     }
 203 }
 204
 205 static void
 206 set_property(GObject *object,
 207              guint prop_id, const GValue *value, GParamSpec *pspec)
 208 {
 209     AdgContainer *container = (AdgContainer *) object;
 210
 211     switch (prop_id) {
 212     case PROP_CHILD:
 213         adg_container_add(container, g_value_get_object(value));
 214         break;
 215     case PROP_MODEL_TRANSFORMATION:
 216         adg_matrix_set(&container->priv->model_transformation,
 217                        g_value_get_boxed(value));
 218         break;
 219     case PROP_PAPER_TRANSFORMATION:
 220         adg_matrix_set(&container->priv->paper_transformation,
 221                        g_value_get_boxed(value));
 222         break;
 223     default:
 224         G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
 225     }
 226 }
 227
 228 static void
 229 dispose(GObject *object)
 230 {
 231     AdgContainer *container = (AdgContainer *) object;
 232
 233     adg_container_foreach(container, G_CALLBACK(adg_entity_unparent), NULL);
 234
 235     ((GObjectClass *) PARENT_CLASS)->dispose(object);
 236 }
 237
 238
 239 static GSList *
 240 get_children(AdgContainer *container)
 241 {
 242     return g_slist_copy(container->priv->children);
 243 }
 244
 245 static gboolean
 246 add(AdgContainer *container, AdgEntity *entity)
 247 {
 248     container->priv->children = g_slist_append(container->priv->children,
 249                                                entity);
 250     return TRUE;
 251 }
 252
 253 static void
 254 real_add(AdgContainer *container, AdgEntity *entity, gpointer user_data)
 255 {
 256     AdgContainer *old_parent;
 257
 258     g_assert(user_data == (gpointer) 0xdeadbeaf);
 259
 260     old_parent = adg_entity_get_parent(entity);
 261
 262     if (old_parent != NULL) {
 263         g_warning("Attempting to add an object with type %s to a container "
 264                   "of type %s, but the object is already inside a container "
 265                   "of type %s.",
 266                   g_type_name(G_OBJECT_TYPE(entity)),
 267                   g_type_name(G_OBJECT_TYPE(container)),
 268                   g_type_name(G_OBJECT_TYPE(old_parent)));
 269         return;
 270     }
 271
 272     if (ADG_CONTAINER_GET_CLASS(container)->add(container, entity))
 273         adg_entity_set_parent(entity, container);
 274     else
 275         g_signal_stop_emission(container, signals[ADD], 0);
 276 }
 277
 278 static gboolean
 279 remove(AdgContainer *container, AdgEntity *entity)
 280 {
 281     GSList *node = g_slist_find(container->priv->children, entity);
 282
 283     if (!node)
 284         return FALSE;
 285
 286     container->priv->children = g_slist_delete_link(container->priv->children,
 287                                                     node);
 288     return TRUE;
 289 }
 290
 291 static void
 292 real_remove(AdgContainer *container, AdgEntity *entity, gpointer user_data)
 293 {
 294     g_assert(user_data == (gpointer) 0xdeadbeaf);
 295
 296     if (ADG_CONTAINER_GET_CLASS(container)->remove(container, entity))
 297         adg_entity_unparent(entity);
 298     else
 299         g_signal_stop_emission(container, signals[REMOVE], 0);
 300 }
 301
 302
 303 static void
 304 model_matrix_changed(AdgEntity *entity, AdgMatrix *parent_matrix)
 305 {
 306     AdgContainer *container = (AdgContainer *) entity;
 307
 308     PARENT_CLASS->model_matrix_changed(entity, parent_matrix);
 309
 310     if (parent_matrix)
 311         cairo_matrix_multiply(&container->priv->model_matrix,
 312                               parent_matrix,
 313                               &container->priv->model_transformation);
 314     else
 315         adg_matrix_set(&container->priv->model_matrix,
 316                        &container->priv->model_transformation);
 317
 318     adg_container_propagate_by_name(container, "model-matrix-changed",
 319                                     &container->priv->model_matrix);
 320 }
 321
 322 static void
 323 paper_matrix_changed(AdgEntity *entity, AdgMatrix *parent_matrix)
 324 {
 325     AdgContainer *container = (AdgContainer *) entity;
 326
 327     PARENT_CLASS->paper_matrix_changed(entity, parent_matrix);
 328
 329     if (parent_matrix)
 330         cairo_matrix_multiply(&container->priv->paper_matrix,
 331                               parent_matrix,
 332                               &container->priv->paper_transformation);
 333     else
 334         adg_matrix_set(&container->priv->paper_matrix,
 335                        &container->priv->paper_transformation);
 336
 337     adg_container_propagate_by_name(container, "paper-matrix-changed",
 338                                     &container->priv->paper_matrix);
 339 }
 340
 341 static const AdgMatrix *
 342 get_model_matrix(AdgEntity *entity)
 343 {
 344     AdgContainer *container = (AdgContainer *) entity;
 345
 346     return &container->priv->model_matrix;
 347 }
 348
 349 static const AdgMatrix *
 350 get_paper_matrix(AdgEntity *entity)
 351 {
 352     AdgContainer *container = (AdgContainer *) entity;
 353
 354     return &container->priv->paper_matrix;
 355 }
 356
 357
 358 static void
 359 invalidate(AdgEntity *entity)
 360 {
 361     adg_container_propagate_by_name((AdgContainer *) entity, "invalidate");
 362     PARENT_CLASS->invalidate(entity);
 363 }
 364
 365 static void
 366 render(AdgEntity *entity, cairo_t *cr)
 367 {
 368     cairo_set_matrix(cr, adg_entity_get_model_matrix(entity));
 369     adg_container_propagate_by_name((AdgContainer *) entity, "render", cr);
 370     PARENT_CLASS->render(entity, cr);
 371 }
 372
 373
 374 /**
 375  * adg_container_add:
 376  * @container: an #AdgContainer
 377  * @entity: an #AdgEntity
 378  *
 379  * Emits a #AdgContainer::add signal on @container passing
 380  * @entity as argument.
 381  *
 382  * @entity may be added to only one container at a time; you can't
 383  * place the same entity inside two different containers.
 384  **/
 385 void
 386 adg_container_add(AdgContainer *container, AdgEntity *entity)
 387 {
 388     g_return_if_fail(ADG_IS_CONTAINER(container));
 389     g_return_if_fail(ADG_IS_ENTITY(entity));
 390
 391     g_signal_emit(container, signals[ADD], 0, entity);
 392 }
 393
 394 /**
 395  * adg_container_remove:
 396  * @container: an #AdgContainer
 397  * @entity: an #AdgEntity
 398  *
 399  * Emits a #AdgContainer::remove signal on @container passing
 400  * @entity as argument. @entity must be inside @container.
 401  *
 402  * Note that @container will own a reference to @entity
 403  * and that this may be the last reference held; so removing an
 404  * entity from its container can destroy it.
 405  *
 406  * If you want to use @entity again, you need to add a reference
 407  * to it, using g_object_ref(), before removing it from @container.
 408  *
 409  * If you don't want to use @entity again, it's usually more
 410  * efficient to simply destroy it directly using g_object_unref()
 411  * since this will remove it from the container.
 412  **/
 413 void
 414 adg_container_remove(AdgContainer *container, AdgEntity *entity)
 415 {
 416     g_return_if_fail(ADG_IS_CONTAINER(container));
 417     g_return_if_fail(ADG_IS_ENTITY(entity));
 418
 419     g_signal_emit(container, signals[REMOVE], 0, entity);
 420 }
 421
 422 /**
 423  * adg_container_get_children:
 424  * @container: an #AdgContainer
 425  *
 426  * Gets the children list of @container.
 427  * This list must be manually freed when no longer user.
 428  *
 429  * Returns: a newly allocated #GSList or %NULL on error
 430  **/
 431 GSList *
 432 adg_container_get_children(AdgContainer *container)
 433 {
 434     g_return_val_if_fail(ADG_IS_CONTAINER(container), NULL);
 435
 436     return ADG_CONTAINER_GET_CLASS(container)->get_children(container);
 437 }
 438
 439 /**
 440  * adg_container_foreach:
 441  * @container: an #AdgContainer
 442  * @callback: a callback
 443  * @user_data: callback user data
 444  *
 445  * Invokes @callback on each child of @container.
 446  * The callback should be declared as:
 447  *
 448  * <code>
 449  * void callback(AdgEntity *entity, gpointer user_data);
 450  * </code>
 451  **/
 452 void
 453 adg_container_foreach(AdgContainer *container,
 454                       GCallback callback, gpointer user_data)
 455 {
 456     GSList *children;
 457
 458     g_return_if_fail(ADG_IS_CONTAINER(container));
 459     g_return_if_fail(callback != NULL);
 460
 461     children = adg_container_get_children (container);
 462
 463     while (children) {
 464         if (children->data)
 465             ((void (*) (gpointer, gpointer)) callback) (children->data, user_data);
 466
 467         children = g_slist_delete_link(children, children);
 468     }
 469 }
 470
 471 /**
 472  * adg_container_propagate:
 473  * @container: an #AdgContainer
 474  * @signal_id: the signal id
 475  * @detail: the detail
 476  * @...: parameters to be passed to the signal, followed by a location for
 477  *       the return value. If the return type of the signal is G_TYPE_NONE,
 478  *       the return value location can be omitted.
 479  *
 480  * Emits the specified signal to all the children of @container
 481  * using g_signal_emit_valist() calls.
 482  **/
 483 void
 484 adg_container_propagate(AdgContainer *container,
 485                         guint signal_id, GQuark detail, ...)
 486 {
 487     va_list var_args;
 488
 489     va_start(var_args, detail);
 490     adg_container_propagate_valist(container, signal_id, detail, var_args);
 491     va_end(var_args);
 492 }
 493
 494 /**
 495  * adg_container_propagate_by_name:
 496  * @container: an #AdgContainer
 497  * @detailed_signal: a string of the form "signal-name::detail".
 498  * @...: a list of parameters to be passed to the signal, followed by
 499  *       a location for the return value. If the return type of the signal
 500  *       is G_TYPE_NONE, the return value location can be omitted.
 501  *
 502  * Emits the specified signal to all the children of @container
 503  * using g_signal_emit_valist() calls.
 504  **/
 505 void
 506 adg_container_propagate_by_name(AdgContainer *container,
 507                                 const gchar *detailed_signal, ...)
 508 {
 509     guint   signal_id;
 510     GQuark  detail = 0;
 511     va_list var_args;
 512
 513     if (!g_signal_parse_name(detailed_signal, G_TYPE_FROM_INSTANCE(container),
 514                              &signal_id, &detail, FALSE)) {
 515         g_warning("%s: signal `%s' is invalid for instance `%p'",
 516                   G_STRLOC, detailed_signal, container);
 517         return;
 518     }
 519
 520     va_start(var_args, detailed_signal);
 521     adg_container_propagate_valist(container, signal_id, detail, var_args);
 522     va_end(var_args);
 523 }
 524
 525 /**
 526  * adg_container_propagate_valist:
 527  * @container: an #AdgContainer
 528  * @signal_id: the signal id
 529  * @detail: the detail
 530  * @var_args: a list of parameters to be passed to the signal, followed by a
 531  *            location for the return value. If the return type of the signal
 532  *            is G_TYPE_NONE, the return value location can be omitted.
 533  *
 534  * Emits the specified signal to all the children of @container
 535  * using g_signal_emit_valist() calls.
 536  **/
 537 void
 538 adg_container_propagate_valist(AdgContainer *container,
 539                                guint signal_id, GQuark detail, va_list var_args)
 540 {
 541     GSList *children;
 542     va_list var_copy;
 543
 544     g_return_if_fail(ADG_IS_CONTAINER(container));
 545
 546     children = adg_container_get_children(container);
 547
 548     while (children) {
 549         if (children->data) {
 550             G_VA_COPY(var_copy, var_args);
 551             g_signal_emit_valist(children->data, signal_id, detail, var_copy);
 552         }
 553
 554         children = g_slist_delete_link(children, children);
 555     }
 556 }
 557
 558 /**
 559  * adg_container_get_model_transformation:
 560  * @container: an #AdgContainer
 561  *
 562  * Returns the transformation to be combined with the transformations of the
 563  * parent hierarchy to get the final matrix to be applied in the model space.
 564  *
 565  * Return value: the model transformation
 566  **/
 567 const AdgMatrix *
 568 adg_container_get_model_transformation(AdgContainer *container)
 569 {
 570     g_return_val_if_fail(ADG_IS_CONTAINER(container), NULL);
 571     return &container->priv->model_transformation;
 572 }
 573
 574 /**
 575  * adg_container_set_model_transformation:
 576  * @container: an #AdgContainer
 577  * @transformation: the new model transformation
 578  *
 579  * Sets the transformation to be applied in model space.
 580  **/
 581 void
 582 adg_container_set_model_transformation(AdgContainer *container,
 583                                        AdgMatrix *transformation)
 584 {
 585     AdgEntity *entity;
 586     AdgEntity *parent;
 587     const AdgMatrix *parent_matrix;
 588
 589     g_return_if_fail(ADG_IS_CONTAINER(container));
 590     g_return_if_fail(transformation != NULL);
 591
 592     entity = (AdgEntity *) container;
 593     parent = (AdgEntity *) adg_entity_get_parent(entity);
 594     parent_matrix = parent ? adg_entity_get_model_matrix(parent) : NULL;
 595
 596     adg_matrix_set(&container->priv->model_transformation, transformation);
 597     adg_entity_model_matrix_changed(entity, parent_matrix);
 598 }
 599
 600 /**
 601  * adg_container_get_paper_transformation:
 602  * @container: an #AdgContainer
 603  *
 604  * Returns the transformation to be combined with the transformations of the
 605  * parent hierarchy to get the final matrix to be applied in the paper space.
 606  *
 607  * Return value: the paper transformation
 608  **/
 609 const AdgMatrix *
 610 adg_container_get_paper_transformation(AdgContainer *container)
 611 {
 612     g_return_val_if_fail(ADG_IS_CONTAINER(container), NULL);
 613     return &container->priv->paper_transformation;
 614 }
 615
 616 /**
 617  * adg_container_set_paper_transformation:
 618  * @container: an #AdgContainer
 619  * @transformation: the new paper transformation
 620  *
 621  * Sets the transformation to be applied in paper space.
 622  **/
 623 void
 624 adg_container_set_paper_transformation(AdgContainer *container,
 625                                        AdgMatrix *transformation)
 626 {
 627     AdgEntity *entity;
 628     AdgEntity *parent;
 629     const AdgMatrix *parent_matrix;
 630
 631     g_return_if_fail(ADG_IS_CONTAINER(container));
 632     g_return_if_fail(transformation != NULL);
 633
 634     entity = (AdgEntity *) container;
 635     parent = (AdgEntity *) adg_entity_get_parent(entity);
 636     parent_matrix = parent ? adg_entity_get_paper_matrix(parent) : NULL;
 637
 638     adg_matrix_set(&container->priv->paper_transformation, transformation);
 639     adg_entity_paper_matrix_changed(entity, parent_matrix);
 640 }