synfig-core/src/synfig/valuenode.cpp

   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file valuenode.cpp
   3 **      \brief Implementation of the "Placeholder" valuenode conversion.
   4 **
   5 **      $Id$
   6 **
   7 **      \legal
   8 **      Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
   9 **      Copyright (c) 2007, 2008 Chris Moore
  10 **  Copyright (c) 2008 Carlos López
  11 **
  12 **      This package is free software; you can redistribute it and/or
  13 **      modify it under the terms of the GNU General Public License as
  14 **      published by the Free Software Foundation; either version 2 of
  15 **      the License, or (at your option) any later version.
  16 **
  17 **      This package is distributed in the hope that it will be useful,
  18 **      but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 **      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  20 **      General Public License for more details.
  21 **      \endlegal
  22 */
  23 /* ========================================================================= */
  24
  25 /* === H E A D E R S ======================================================= */
  26
  27 #ifdef USING_PCH
  28 #       include "pch.h"
  29 #else
  30 #ifdef HAVE_CONFIG_H
  31 #       include <config.h>
  32 #endif
  33
  34 #include "valuenode.h"
  35 #include "general.h"
  36 #include "canvas.h"
  37 #include "paramdesc.h"
  38 #include "releases.h"
  39
  40 #include "valuenode_const.h"
  41 #include "valuenode_linear.h"
  42 #include "valuenode_composite.h"
  43 #include "valuenode_reference.h"
  44 #include "valuenode_greyed.h"
  45 #include "valuenode_scale.h"
  46 #include "valuenode_blinecalctangent.h"
  47 #include "valuenode_blinecalcvertex.h"
  48 #include "valuenode_blinecalcwidth.h"
  49 #include "valuenode_blinereversetangent.h"
  50 #include "valuenode_segcalctangent.h"
  51 #include "valuenode_segcalcvertex.h"
  52 #include "valuenode_repeat_gradient.h"
  53 #include "valuenode_stripes.h"
  54 #include "valuenode_range.h"
  55 #include "valuenode_add.h"
  56 #include "valuenode_subtract.h"
  57 #include "valuenode_timedswap.h"
  58 #include "valuenode_twotone.h"
  59 #include "valuenode_bline.h"
  60 #include "valuenode_dynamiclist.h"
  61 #include "valuenode_radialcomposite.h"
  62 #include "valuenode_gradientrotate.h"
  63 #include "valuenode_sine.h"
  64 #include "valuenode_cos.h"
  65 #include "valuenode_atan2.h"
  66 #include "valuenode_exp.h"
  67 #include "valuenode_switch.h"
  68 #include "valuenode_timeloop.h"
  69 #include "valuenode_reciprocal.h"
  70 #include "valuenode_duplicate.h"
  71 #include "valuenode_integer.h"
  72 #include "valuenode_step.h"
  73 #include "valuenode_vectorangle.h"
  74 #include "valuenode_vectorlength.h"
  75 #include "valuenode_vectorx.h"
  76 #include "valuenode_vectory.h"
  77 #include "valuenode_gradientcolor.h"
  78 #include "valuenode_dotproduct.h"
  79 #include "valuenode_timestring.h"
  80 #include "valuenode_realstring.h"
  81 #include "valuenode_join.h"
  82 #include "valuenode_anglestring.h"
  83 #include "valuenode_intstring.h"
  84 #include "valuenode_log.h"
  85 #include "valuenode_pow.h"
  86 #include "valuenode_compare.h"
  87 #include "valuenode_not.h"
  88 #include "valuenode_and.h"
  89 #include "valuenode_or.h"
  90
  91 #include "layer.h"
  92
  93 #endif
  94
  95 /* === U S I N G =========================================================== */
  96
  97 using namespace std;
  98 using namespace etl;
  99 using namespace synfig;
 100
 101 /* === M A C R O S ========================================================= */
 102
 103 /* === G L O B A L S ======================================================= */
 104
 105 static int value_node_count(0);
 106
 107 static LinkableValueNode::Book *book_;
 108
 109
 110 ValueNode::LooseHandle
 111 synfig::find_value_node(const GUID& guid)
 112 {
 113         return guid_cast<ValueNode>(guid);
 114 }
 115
 116 /* === P R O C E D U R E S ================================================= */
 117
 118 /* === M E T H O D S ======================================================= */
 119
 120 bool
 121 ValueNode::subsys_init()
 122 {
 123         book_=new LinkableValueNode::Book();
 124
 125 #define ADD_VALUENODE(class,name,local,version)                                                                                                 \
 126         (*book_)[name].factory=reinterpret_cast<LinkableValueNode::Factory>(&class::create);            \
 127         (*book_)[name].check_type=&class::check_type;                                                                                           \
 128         (*book_)[name].local_name=local;                                                                                                                        \
 129         (*book_)[name].release_version=version
 130
 131 #define ADD_VALUENODE2(class,name,local,version)                                                                                                \
 132         (*book_)[name].factory=reinterpret_cast<LinkableValueNode::Factory>(&class::create_from);       \
 133         (*book_)[name].check_type=&class::check_type;                                                                                           \
 134         (*book_)[name].local_name=local;                                                                                                                        \
 135         (*book_)[name].release_version=version
 136
 137         ADD_VALUENODE(ValueNode_Linear,                   "linear",                       _("Linear"),                   RELEASE_VERSION_0_61_06);
 138         ADD_VALUENODE(ValueNode_Composite,                "composite",            _("Composite"),                RELEASE_VERSION_0_61_06);
 139         ADD_VALUENODE(ValueNode_RadialComposite,  "radial_composite", _("Radial Composite"), RELEASE_VERSION_0_61_06);
 140         ADD_VALUENODE(ValueNode_Reference,                "reference",            _("Reference"),                RELEASE_VERSION_0_61_06);
 141         ADD_VALUENODE(ValueNode_Scale,                    "scale",                        _("Scale"),                    RELEASE_VERSION_0_61_06);
 142         ADD_VALUENODE(ValueNode_SegCalcTangent,   "segcalctangent",       _("Segment Tangent"),  RELEASE_VERSION_0_61_06);
 143         ADD_VALUENODE(ValueNode_SegCalcVertex,    "segcalcvertex",        _("Segment Vertex"),   RELEASE_VERSION_0_61_06);
 144         ADD_VALUENODE(ValueNode_Stripes,                  "stripes",              _("Stripes"),                  RELEASE_VERSION_0_61_06);
 145         ADD_VALUENODE(ValueNode_Subtract,                 "subtract",             _("Subtract"),                 RELEASE_VERSION_0_61_06);
 146         ADD_VALUENODE(ValueNode_TwoTone,                  "twotone",              _("Two-Tone"),                 RELEASE_VERSION_0_61_06);
 147         ADD_VALUENODE(ValueNode_BLine,                    "bline",                        _("BLine"),                    RELEASE_VERSION_0_61_06);
 148         ADD_VALUENODE2(ValueNode_DynamicList,     "dynamic_list",         _("Dynamic List"),     RELEASE_VERSION_0_61_06);
 149         ADD_VALUENODE(ValueNode_GradientRotate,   "gradient_rotate",  _("Gradient Rotate"),      RELEASE_VERSION_0_61_06);
 150         ADD_VALUENODE(ValueNode_Sine,                     "sine",                         _("Sine"),                     RELEASE_VERSION_0_61_06);
 151
 152         ADD_VALUENODE(ValueNode_TimedSwap,                "timed_swap",           _("Timed Swap"),               RELEASE_VERSION_0_61_07); // SVN r610
 153         ADD_VALUENODE(ValueNode_Repeat_Gradient,  "repeat_gradient",  _("Repeat Gradient"),      RELEASE_VERSION_0_61_07); // SVN r666
 154         ADD_VALUENODE(ValueNode_Exp,                      "exp",                          _("Exponential"),              RELEASE_VERSION_0_61_07); // SVN r739
 155         ADD_VALUENODE(ValueNode_Add,                      "add",                          _("Add"),                              RELEASE_VERSION_0_61_07); // SVN r742
 156         ADD_VALUENODE(ValueNode_BLineCalcTangent, "blinecalctangent", _("BLine Tangent"),        RELEASE_VERSION_0_61_07); // SVN r744
 157         ADD_VALUENODE(ValueNode_BLineCalcVertex,  "blinecalcvertex",  _("BLine Vertex"),         RELEASE_VERSION_0_61_07); // SVN r744
 158         ADD_VALUENODE(ValueNode_Range,                    "range",                        _("Range"),                    RELEASE_VERSION_0_61_07); // SVN r776
 159
 160         ADD_VALUENODE(ValueNode_Switch,                   "switch",                       _("Switch"),                   RELEASE_VERSION_0_61_08); // SVN r923
 161         ADD_VALUENODE(ValueNode_Cos,                      "cos",                          _("Cos"),                              RELEASE_VERSION_0_61_08); // SVN r1111
 162         ADD_VALUENODE(ValueNode_Atan2,                    "atan2",                        _("aTan2"),                    RELEASE_VERSION_0_61_08); // SVN r1132
 163         ADD_VALUENODE(ValueNode_BLineRevTangent,  "blinerevtangent",  _("Reverse Tangent"),      RELEASE_VERSION_0_61_08); // SVN r1162
 164         ADD_VALUENODE(ValueNode_TimeLoop,                 "timeloop",             _("Time Loop"),                RELEASE_VERSION_0_61_08); // SVN r1226
 165         ADD_VALUENODE(ValueNode_Reciprocal,               "reciprocal",           _("Reciprocal"),               RELEASE_VERSION_0_61_08); // SVN r1238
 166         ADD_VALUENODE(ValueNode_Duplicate,                "duplicate",            _("Duplicate"),                RELEASE_VERSION_0_61_08); // SVN r1267
 167         ADD_VALUENODE(ValueNode_Integer,                  "fromint",              _("From Integer"),     RELEASE_VERSION_0_61_08); // SVN r1267
 168         ADD_VALUENODE(ValueNode_Step,                     "step",                         _("Step"),                     RELEASE_VERSION_0_61_08); // SVN r1691
 169         ADD_VALUENODE(ValueNode_BLineCalcWidth,   "blinecalcwidth",       _("BLine Width"),              RELEASE_VERSION_0_61_08); // SVN r1694
 170
 171         ADD_VALUENODE(ValueNode_VectorAngle,      "vectorangle",          _("Vector Angle"),     RELEASE_VERSION_0_61_09); // SVN r1880
 172         ADD_VALUENODE(ValueNode_VectorLength,     "vectorlength",         _("Vector Length"),    RELEASE_VERSION_0_61_09); // SVN r1881
 173         ADD_VALUENODE(ValueNode_VectorX,                  "vectorx",              _("Vector X"),                 RELEASE_VERSION_0_61_09); // SVN r1882
 174         ADD_VALUENODE(ValueNode_VectorY,                  "vectory",              _("Vector Y"),                 RELEASE_VERSION_0_61_09); // SVN r1882
 175         ADD_VALUENODE(ValueNode_GradientColor,    "gradientcolor",        _("Gradient Color"),   RELEASE_VERSION_0_61_09); // SVN r1885
 176         ADD_VALUENODE(ValueNode_DotProduct,               "dotproduct",           _("Dot Product"),              RELEASE_VERSION_0_61_09); // SVN r1891
 177         ADD_VALUENODE(ValueNode_TimeString,               "timestring",           _("Time String"),              RELEASE_VERSION_0_61_09); // SVN r2000
 178         ADD_VALUENODE(ValueNode_RealString,               "realstring",           _("Real String"),              RELEASE_VERSION_0_61_09); // SVN r2003
 179         ADD_VALUENODE(ValueNode_Join,                     "join",                         _("Joined List"),              RELEASE_VERSION_0_61_09); // SVN r2007
 180         ADD_VALUENODE(ValueNode_AngleString,      "anglestring",          _("Angle String"),     RELEASE_VERSION_0_61_09); // SVN r2010
 181         ADD_VALUENODE(ValueNode_IntString,                "intstring",            _("Int String"),               RELEASE_VERSION_0_61_09); // SVN r2010
 182         ADD_VALUENODE(ValueNode_Logarithm,                "logarithm",            _("Logarithm"),                RELEASE_VERSION_0_61_09); // SVN r2034
 183
 184         ADD_VALUENODE(ValueNode_Greyed,                   "greyed",                       _("Greyed"),                   RELEASE_VERSION_0_62_00); // SVN r2305
 185         ADD_VALUENODE(ValueNode_Pow,                  "power",                _("Power"),                    RELEASE_VERSION_0_62_00); // SVN r2362
 186         ADD_VALUENODE(ValueNode_Compare,                  "compare",              _("Compare"),                  RELEASE_VERSION_0_62_00); // SVN r2364
 187         ADD_VALUENODE(ValueNode_Not,                  "not",                      _("Not"),                              RELEASE_VERSION_0_62_00); // SVN r2364
 188         ADD_VALUENODE(ValueNode_And,                  "and",                      _("And"),                              RELEASE_VERSION_0_62_00); // SVN r2364
 189         ADD_VALUENODE(ValueNode_Or,                       "or",                   _("Or"),                                       RELEASE_VERSION_0_62_00); // SVN r2364
 190
 191 #undef ADD_VALUENODE
 192 #undef ADD_VALUENODE2
 193
 194         return true;
 195 }
 196
 197 bool
 198 ValueNode::subsys_stop()
 199 {
 200         delete book_;
 201 /*      if(global_value_node_map.size() || value_node_count)
 202         {
 203                 if(value_node_count)
 204                         synfig::error("%d ValueNodes haven't been destroyed yet!",value_node_count);
 205
 206                 if(global_value_node_map.size()!=value_node_count)
 207                         synfig::error("value node count mismatch! map.size()!=value_node_count (%d!=%d)",global_value_node_map.size(),value_node_count);
 208
 209                 GlobalValueNodeMap::iterator iter;
 210                 for(iter=global_value_node_map.begin();iter!=global_value_node_map.end();++iter)
 211                 {
 212                         if(!iter->second->is_exported())
 213                                 synfig::info(_("%s: count:%d name:%s type:%s"),
 214                                         iter->first.get_string().c_str(),
 215                                         iter->second->count(),
 216                                         iter->second->get_name().c_str(),
 217                                         ValueBase::type_local_name(iter->second->get_type()).c_str()
 218                                 );
 219                         else
 220                                 synfig::info(_("%s: id:%s count:%d name:%s type:%s"),
 221                                         iter->first.get_string().c_str(),
 222                                         iter->second->get_id().c_str(),
 223                                         iter->second->count(),
 224                                         iter->second->get_name().c_str(),
 225                                         ValueBase::type_local_name(iter->second->get_type()).c_str()
 226                                 );
 227                 }
 228         }
 229 */
 230         return true;
 231 }
 232
 233 ValueNode::ValueNode(ValueBase::Type type):type(type)
 234 {
 235         value_node_count++;
 236 }
 237
 238 LinkableValueNode::Book&
 239 LinkableValueNode::book()
 240 {
 241         return *book_;
 242 }
 243
 244 LinkableValueNode::Handle
 245 LinkableValueNode::create(const String &name, const ValueBase& x)
 246 {
 247         if(!book().count(name))
 248                 return 0;
 249
 250         if (!check_type(name, x.get_type()) &&
 251                 // the Duplicate ValueNode is an exception - we don't want the
 252                 // user creating it for themselves, so check_type() fails for
 253                 // it even when it is valid
 254                 !(name == "duplicate" && x.get_type() == ValueBase::TYPE_REAL))
 255         {
 256                 error(_("Bad type: ValueNode '%s' doesn't accept type '%s'"), book()[name].local_name.c_str(), ValueBase::type_local_name(x.get_type()).c_str());
 257                 return 0;
 258         }
 259
 260         return book()[name].factory(x);
 261 }
 262
 263 bool
 264 LinkableValueNode::check_type(const String &name, ValueBase::Type x)
 265 {
 266         if(!book().count(name) || !book()[name].check_type)
 267                 return false;
 268         return book()[name].check_type(x);
 269 }
 270
 271 bool
 272 LinkableValueNode::set_link(int i,ValueNode::Handle x)
 273 {
 274         ValueNode::Handle previous(get_link(i));
 275
 276         if(set_link_vfunc(i,x))
 277         {
 278                 // Fix 2412072: remove the previous link from the parent_set unless one of the other links is also
 279                 // using it when we convert a value to 'switch', both 'on' and 'off' are linked to the same valuenode
 280                 // if we then disconnect one of the two, the one we disconnect is set to be a new valuenode_const
 281                 // and the previously shared value is removed from the parent set even though the other is still
 282                 // using it
 283                 if(previous)
 284                 {
 285                         int size = link_count(), index;
 286                         for (index=0; index < size; ++index)
 287                         {
 288                                 if (i == index) continue;
 289                                 if (get_link(index) == previous)
 290                                         break;
 291                         }
 292                         if (index == size)
 293                                 remove_child(previous.get());
 294                 }
 295                 add_child(x.get());
 296
 297                 if(!x->is_exported() && get_parent_canvas())
 298                 {
 299                         x->set_parent_canvas(get_parent_canvas());
 300                 }
 301                 changed();
 302                 return true;
 303         }
 304         return false;
 305 }
 306
 307 ValueNode::LooseHandle
 308 LinkableValueNode::get_link(int i)const
 309 {
 310         return get_link_vfunc(i);
 311 }
 312
 313 void
 314 LinkableValueNode::unlink_all()
 315 {
 316         for(int i=0;i<link_count();i++)
 317         {
 318                 ValueNode::LooseHandle value_node(get_link(i));
 319                 if(value_node)
 320                         value_node->parent_set.erase(this);
 321         }
 322 }
 323
 324 ValueNode::~ValueNode()
 325 {
 326         value_node_count--;
 327
 328         begin_delete();
 329 }
 330
 331 void
 332 ValueNode::on_changed()
 333 {
 334         etl::loose_handle<Canvas> parent_canvas = get_parent_canvas();
 335         if(parent_canvas)
 336                 do                                              // signal to all the ancestor canvases
 337                         parent_canvas->signal_value_node_changed()(this);
 338                 while (parent_canvas = parent_canvas->parent());
 339         else if(get_root_canvas())
 340                 get_root_canvas()->signal_value_node_changed()(this);
 341
 342         Node::on_changed();
 343 }
 344
 345 int
 346 ValueNode::replace(etl::handle<ValueNode> x)
 347 {
 348         if(x.get()==this)
 349                 return 0;
 350
 351         while(parent_set.size())
 352         {
 353                 (*parent_set.begin())->add_child(x.get());
 354                 (*parent_set.begin())->remove_child(this);
 355                 //x->parent_set.insert(*parent_set.begin());
 356                 //parent_set.erase(parent_set.begin());
 357         }
 358         int r(RHandle(this).replace(x));
 359         x->changed();
 360         return r;
 361 }
 362
 363 void
 364 ValueNode::set_id(const String &x)
 365 {
 366         if(name!=x)
 367         {
 368                 name=x;
 369                 signal_id_changed_();
 370         }
 371 }
 372
 373 String
 374 ValueNode::get_description(bool show_exported_name)const
 375 {
 376         String ret(_("ValueNode"));
 377
 378         if (dynamic_cast<const LinkableValueNode*>(this))
 379                 return (dynamic_cast<const LinkableValueNode*>(this))->get_description(-1, show_exported_name);
 380
 381         if (show_exported_name && !is_exported())
 382                 show_exported_name = false;
 383
 384         if (show_exported_name)
 385                 ret += strprintf(" (%s)", get_id().c_str());
 386
 387         return ret;
 388 }
 389
 390 ValueNodeList::ValueNodeList():
 391         placeholder_count_(0)
 392 {
 393 }
 394
 395 bool
 396 ValueNodeList::count(const String &id)const
 397 {
 398         const_iterator iter;
 399
 400         if(id.empty())
 401                 return false;
 402
 403         for(iter=begin();iter!=end() && id!=(*iter)->get_id();++iter)
 404                 ;
 405
 406         if(iter==end())
 407                 return false;
 408
 409         return true;
 410 }
 411
 412 ValueNode::Handle
 413 ValueNodeList::find(const String &id)
 414 {
 415         iterator iter;
 416
 417         if(id.empty())
 418                 throw Exception::IDNotFound("Empty ID");
 419
 420         for(iter=begin();iter!=end() && id!=(*iter)->get_id();++iter)
 421                 ;
 422
 423         if(iter==end())
 424                 throw Exception::IDNotFound("ValueNode in ValueNodeList: "+id);
 425
 426         return *iter;
 427 }
 428
 429 ValueNode::ConstHandle
 430 ValueNodeList::find(const String &id)const
 431 {
 432         const_iterator iter;
 433
 434         if(id.empty())
 435                 throw Exception::IDNotFound("Empty ID");
 436
 437         for(iter=begin();iter!=end() && id!=(*iter)->get_id();++iter)
 438                 ;
 439
 440         if(iter==end())
 441                 throw Exception::IDNotFound("ValueNode in ValueNodeList: "+id);
 442
 443         return *iter;
 444 }
 445
 446 ValueNode::Handle
 447 ValueNodeList::surefind(const String &id)
 448 {
 449         if(id.empty())
 450                 throw Exception::IDNotFound("Empty ID");
 451
 452         ValueNode::Handle value_node;
 453
 454         try
 455         {
 456                 value_node=find(id);
 457         }
 458         catch(Exception::IDNotFound)
 459         {
 460                 value_node=PlaceholderValueNode::create();
 461                 value_node->set_id(id);
 462                 push_back(value_node);
 463                 placeholder_count_++;
 464         }
 465
 466         return value_node;
 467 }
 468
 469 bool
 470 ValueNodeList::erase(ValueNode::Handle value_node)
 471 {
 472         assert(value_node);
 473
 474         iterator iter;
 475
 476         for(iter=begin();iter!=end();++iter)
 477                 if(value_node.get()==iter->get())
 478                 {
 479                         std::list<ValueNode::RHandle>::erase(iter);
 480                         if(PlaceholderValueNode::Handle::cast_dynamic(value_node))
 481                                 placeholder_count_--;
 482                         return true;
 483                 }
 484         return false;
 485 }
 486
 487 bool
 488 ValueNodeList::add(ValueNode::Handle value_node)
 489 {
 490         if(!value_node)
 491                 return false;
 492         if(value_node->get_id().empty())
 493                 return false;
 494
 495         try
 496         {
 497                 ValueNode::RHandle other_value_node=find(value_node->get_id());
 498                 if(PlaceholderValueNode::Handle::cast_dynamic(other_value_node))
 499                 {
 500                         other_value_node->replace(value_node);
 501                         placeholder_count_--;
 502                         return true;
 503                 }
 504
 505                 return false;
 506         }
 507         catch(Exception::IDNotFound)
 508         {
 509                 push_back(value_node);
 510                 return true;
 511         }
 512
 513         return false;
 514 }
 515
 516 void
 517 ValueNodeList::audit()
 518 {
 519         iterator iter,next;
 520
 521         for(next=begin(),iter=next++;iter!=end();iter=next++)
 522                 if(iter->count()==1)
 523                         std::list<ValueNode::RHandle>::erase(iter);
 524 }
 525
 526
 527 String
 528 PlaceholderValueNode::get_name()const
 529 {
 530         return "placeholder";
 531 }
 532
 533 String
 534 PlaceholderValueNode::get_local_name()const
 535 {
 536         return _("Placeholder");
 537 }
 538
 539 ValueNode*
 540 PlaceholderValueNode::clone(const GUID& deriv_guid)const
 541 {
 542         ValueNode* ret(new PlaceholderValueNode());
 543         ret->set_guid(get_guid()^deriv_guid);
 544         return ret;
 545 }
 546
 547 PlaceholderValueNode::Handle
 548 PlaceholderValueNode::create(ValueBase::Type type)
 549 {
 550         return new PlaceholderValueNode(type);
 551 }
 552
 553 ValueBase
 554 PlaceholderValueNode::operator()(Time /*t*/)const
 555 {
 556         assert(0);
 557         return ValueBase();
 558 }
 559
 560 PlaceholderValueNode::PlaceholderValueNode(ValueBase::Type type):
 561         ValueNode(type)
 562 {
 563 }
 564
 565 ValueNode*
 566 LinkableValueNode::clone(const GUID& deriv_guid)const
 567 {
 568         {
 569                 ValueNode* x(find_value_node(get_guid()^deriv_guid).get());
 570                 if(x)
 571                         return x;
 572         }
 573
 574         int i;
 575         LinkableValueNode *ret=create_new();
 576         ret->set_guid(get_guid()^deriv_guid);
 577
 578         for(i=0;i<link_count();i++)
 579         {
 580                 ValueNode::Handle link=get_link_vfunc(i);
 581                 if(!link->is_exported())
 582                 {
 583                         ValueNode::LooseHandle value_node(find_value_node(link->get_guid()^deriv_guid));
 584                         if(!value_node)
 585                                 value_node=link->clone(deriv_guid);
 586                         ret->set_link(i,value_node);
 587                 }
 588                 else
 589                         ret->set_link(i,link);
 590         }
 591
 592         return ret;
 593 }
 594
 595 String
 596 ValueNode::get_relative_id(etl::loose_handle<const Canvas> x)const
 597 {
 598         assert(is_exported());
 599         assert(canvas_);
 600
 601         if(x.get()==canvas_.get())
 602                 return get_id();
 603
 604         return canvas_->_get_relative_id(x)+':'+get_id();
 605 }
 606
 607 void
 608 ValueNode::set_parent_canvas(etl::loose_handle<Canvas> x)
 609 {
 610         canvas_=x; if(x) root_canvas_=x->get_root();
 611 }
 612
 613 void
 614 ValueNode::set_root_canvas(etl::loose_handle<Canvas> x)
 615 {
 616         root_canvas_=x->get_root();
 617 }
 618
 619 void LinkableValueNode::get_times_vfunc(Node::time_set &set) const
 620 {
 621         ValueNode::LooseHandle  h;
 622
 623         int size = link_count();
 624
 625         //just add it to the set...
 626         for(int i=0; i < size; ++i)
 627         {
 628                 h = get_link(i);
 629
 630                 if(h)
 631                 {
 632                         const Node::time_set &tset = h->get_times();
 633                         set.insert(tset.begin(),tset.end());
 634                 }
 635         }
 636 }
 637
 638 String
 639 LinkableValueNode::get_description(int index, bool show_exported_name)const
 640 {
 641         String description;
 642
 643         if (index == -1)
 644         {
 645                 if (show_exported_name && is_exported())
 646                         description += strprintf(" (%s)", get_id().c_str());
 647         }
 648         else
 649         {
 650                 description = String(":") + link_local_name(index);
 651
 652                 if (show_exported_name)
 653                 {
 654                         ValueNode::LooseHandle link(get_link(index));
 655                         if (link->is_exported())
 656                                 description += strprintf(" (%s)", link->get_id().c_str());
 657                 }
 658         }
 659
 660         const synfig::Node* node = this;
 661         LinkableValueNode::ConstHandle parent_linkable_vn = 0;
 662
 663         // walk up through the valuenodes trying to find the layer at the top
 664         while (!node->parent_set.empty() && !dynamic_cast<const Layer*>(node))
 665         {
 666                 LinkableValueNode::ConstHandle linkable_value_node(dynamic_cast<const LinkableValueNode*>(node));
 667                 if (linkable_value_node)
 668                 {
 669                         String link;
 670                         int cnt = linkable_value_node->link_count();
 671                         for (int i = 0; i < cnt; i++)
 672                                 if (linkable_value_node->get_link(i) == parent_linkable_vn)
 673                                 {
 674                                         link = String(":") + linkable_value_node->link_local_name(i);
 675                                         break;
 676                                 }
 677
 678                         description = linkable_value_node->get_local_name() + link + (parent_linkable_vn?">":"") + description;
 679                 }
 680                 node = *node->parent_set.begin();
 681                 parent_linkable_vn = linkable_value_node;
 682         }
 683
 684         Layer::ConstHandle parent_layer(dynamic_cast<const Layer*>(node));
 685         if(parent_layer)
 686         {
 687                 String param;
 688                 const Layer::DynamicParamList &dynamic_param_list(parent_layer->dynamic_param_list());
 689                 // loop to find the parameter in the dynamic parameter list - this gives us its name
 690                 for (Layer::DynamicParamList::const_iterator iter = dynamic_param_list.begin(); iter != dynamic_param_list.end(); iter++)
 691                         if (iter->second == parent_linkable_vn)
 692                                 param = String(":") + parent_layer->get_param_local_name(iter->first);
 693                 description = strprintf("(%s)%s>%s",
 694                                                                 parent_layer->get_non_empty_description().c_str(),
 695                                                                 param.c_str(),
 696                                                                 description.c_str());
 697         }
 698
 699         return description;
 700 }