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