synfig-studio/trunk/src/synfigapp/canvasinterface.cpp

   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file canvasinterface.cpp
   3 **      \brief Template File
   4 **
   5 **      $Id: canvasinterface.cpp,v 1.1.1.1 2005/01/07 03:34:37 darco Exp $
   6 **
   7 **      \legal
   8 **      Copyright (c) 2002 Robert B. Quattlebaum Jr.
   9 **
  10 **      This software and associated documentation
  11 **      are CONFIDENTIAL and PROPRIETARY property of
  12 **      the above-mentioned copyright holder.
  13 **
  14 **      You may not copy, print, publish, or in any
  15 **      other way distribute this software without
  16 **      a prior written agreement with
  17 **      the copyright holder.
  18 **      \endlegal
  19 */
  20 /* ========================================================================= */
  21
  22 /* === H E A D E R S ======================================================= */
  23
  24 #ifdef USING_PCH
  25 #       include "pch.h"
  26 #else
  27 #ifdef HAVE_CONFIG_H
  28 #       include <config.h>
  29 #endif
  30
  31 //#include <iostream>
  32
  33 #include <ETL/clock>
  34 #include <synfig/valuenode_scale.h>
  35 #include <synfig/valuenode_timedswap.h>
  36 #include <synfig/valuenode_composite.h>
  37 #include <synfig/valuenode_subtract.h>
  38 #include <synfig/valuenode_linear.h>
  39 #include <synfig/valuenode_reference.h>
  40 #include <synfig/valuenode_twotone.h>
  41 #include <synfig/valuenode_stripes.h>
  42
  43 #include <synfig/waypoint.h>
  44 #include <synfig/loadcanvas.h>
  45 #include <synfig/importer.h>
  46 #include <synfig/guidset.h>
  47
  48 #include "canvasinterface.h"
  49 #include "instance.h"
  50
  51 #include "actions/layeradd.h"
  52 #include "actions/valuedescconvert.h"
  53 #include "actions/valuenodeadd.h"
  54 #include "actions/editmodeset.h"
  55 #include "action_system.h"
  56
  57 #include "main.h"
  58
  59 #include <synfig/gradient.h>
  60
  61 #endif
  62
  63 /* === U S I N G =========================================================== */
  64
  65 using namespace std;
  66 using namespace etl;
  67 using namespace synfig;
  68 using namespace synfigapp;
  69
  70 /* === M A C R O S ========================================================= */
  71
  72 /* === G L O B A L S ======================================================= */
  73
  74 /* === P R O C E D U R E S ================================================= */
  75
  76 /* === M E T H O D S ======================================================= */
  77
  78 CanvasInterface::CanvasInterface(loose_handle<Instance> instance,handle<Canvas> canvas):
  79         instance_(instance),
  80         canvas_(canvas),
  81         cur_time_(canvas->rend_desc().get_frame_start()),
  82         mode_(MODE_NORMAL|MODE_ANIMATE_PAST|MODE_ANIMATE_FUTURE)
  83 {
  84         set_selection_manager(get_instance()->get_selection_manager());
  85         set_ui_interface(get_instance()->get_ui_interface());
  86 }
  87
  88 CanvasInterface::~CanvasInterface()
  89 {
  90         synfig::info("synfigapp::CanvasInterface::~CanvasInterface(): Deleted");
  91 }
  92
  93 void
  94 CanvasInterface::set_time(synfig::Time x)
  95 {
  96         if(get_canvas()->rend_desc().get_frame_rate())
  97         {
  98                 float fps(get_canvas()->rend_desc().get_frame_rate());
  99                 Time r(x.round(fps));
 100                 //synfig::info("CanvasInterface::set_time(): %s rounded to %s\n",x.get_string(fps).c_str(),r.get_string(fps).c_str());
 101                 x=r;
 102         }
 103         if(cur_time_.is_equal(x))
 104                 return;
 105         cur_time_=x;
 106
 107         signal_time_changed()();
 108         signal_dirty_preview()();
 109 }
 110
 111 synfig::Time
 112 CanvasInterface::get_time()const
 113 {
 114         return cur_time_;
 115 }
 116
 117 void
 118 CanvasInterface::refresh_current_values()
 119 {
 120         get_canvas()->set_time(cur_time_);
 121         signal_time_changed()();
 122         signal_dirty_preview()();
 123 }
 124
 125 etl::handle<CanvasInterface>
 126 CanvasInterface::create(loose_handle<Instance> instance,handle<Canvas> canvas)
 127 {
 128         etl::handle<CanvasInterface> intrfc;
 129         intrfc=new CanvasInterface(instance,canvas);
 130         instance->canvas_interface_list().push_front(intrfc);
 131         return intrfc;
 132 }
 133
 134 void
 135 CanvasInterface::set_mode(Mode x)
 136 {
 137         Action::Handle  action(Action::EditModeSet::create());
 138
 139         assert(action);
 140
 141         action->set_param("canvas",get_canvas());
 142         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 143         action->set_param("edit_mode",x);
 144
 145         if(!action->is_ready())
 146         {
 147                 get_ui_interface()->error(_("Action Not Ready, unable to change mode"));
 148                 assert(0);
 149                 return;
 150         }
 151
 152         if(!get_instance()->perform_action(action))
 153                 get_ui_interface()->error(_("Unable to change mode"));
 154
 155 //      mode_=x;
 156 //      signal_mode_changed_(x);
 157 }
 158
 159 CanvasInterface::Mode
 160 CanvasInterface::get_mode()const
 161 {
 162         return mode_;
 163 }
 164
 165
 166
 167 Layer::Handle
 168 CanvasInterface::add_layer_to(String name, Canvas::Handle canvas, int depth)
 169 {
 170         synfigapp::Action::PassiveGrouper group(get_instance().get(),_("Add Layer To"));
 171
 172         Layer::Handle   layer(Layer::create(name));
 173
 174         assert(layer);
 175
 176         if(!layer)
 177                 return 0;
 178
 179         if(canvas!=get_canvas() && !canvas->is_inline())
 180         {
 181                 synfig::error("Bad canvas passed to \"add_layer_to\"");
 182                 return 0;
 183         }
 184
 185         layer->set_canvas(canvas);
 186
 187         // Apply some defaults
 188         if(layer->set_param("fg",synfigapp::Main::get_foreground_color()))
 189                 layer->set_param("bg",synfigapp::Main::get_background_color());
 190         else
 191                 layer->set_param("color",synfigapp::Main::get_foreground_color());
 192
 193         layer->set_param("width",synfigapp::Main::get_bline_width().units(get_canvas()->rend_desc()));
 194         layer->set_param("gradient",synfigapp::Main::get_gradient());
 195         if(name!="zoom")
 196                 layer->set_param("amount",synfigapp::Main::get_opacity());
 197         layer->set_param("blend_method",synfigapp::Main::get_blend_method());
 198
 199         {
 200                 // Grab the layer's list pf parameters
 201                 Layer::ParamList paramlist=layer->get_param_list();
 202                 Layer::ParamList::iterator iter;
 203                 for(iter=paramlist.begin();iter!=paramlist.end();++iter)
 204                 {
 205                         ValueNode::Handle value_node;
 206
 207                         if(iter->second.get_type()==ValueBase::TYPE_LIST)
 208                                 value_node=LinkableValueNode::create("dynamic_list",iter->second);
 209                         else if(LinkableValueNode::check_type("composite",iter->second.get_type()) &&
 210                                 (iter->second.get_type()!=ValueBase::TYPE_COLOR && iter->second.get_type()!=ValueBase::TYPE_VECTOR)
 211                         )
 212                                 value_node=LinkableValueNode::create("composite",iter->second);
 213
 214                         if(value_node)
 215                                 layer->connect_dynamic_param(iter->first,value_node);
 216                 }
 217         }
 218
 219         // Action to add the layer
 220         Action::Handle  action(Action::LayerAdd::create());
 221
 222         assert(action);
 223         if(!action)
 224                 return 0;
 225
 226         action->set_param("canvas",canvas);
 227         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 228         action->set_param("new",layer);
 229
 230         if(!action->is_ready())
 231         {
 232                 get_ui_interface()->error(_("Action Not Ready"));
 233                 return 0;
 234         }
 235
 236         if(!get_instance()->perform_action(action))
 237         {
 238                 get_ui_interface()->error(_("Action Failed."));
 239                 return 0;
 240         }
 241
 242         synfig::info("DEPTH=%d",depth);
 243         // Action to move the layer (if necessary)
 244         if(depth>0)
 245         {
 246                 Action::Handle  action(Action::create("layer_move"));
 247
 248                 assert(action);
 249                 if(!action)
 250                         return 0;
 251
 252                 action->set_param("canvas",canvas);
 253                 action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 254                 action->set_param("layer",layer);
 255                 action->set_param("new_index",depth);
 256
 257                 if(!action->is_ready())
 258                 {
 259                         get_ui_interface()->error(_("Move Action Not Ready"));
 260                         return 0;
 261                 }
 262
 263                 if(!get_instance()->perform_action(action))
 264                 {
 265                         get_ui_interface()->error(_("Move Action Failed."));
 266                         return 0;
 267                 }
 268         }
 269
 270
 271         return layer;
 272 }
 273
 274
 275 bool
 276 CanvasInterface::convert(ValueDesc value_desc, String type)
 277 {
 278         Action::Handle  action(Action::ValueDescConvert::create());
 279
 280         assert(action);
 281         if(!action)
 282                 return 0;
 283
 284         action->set_param("canvas",get_canvas());
 285         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 286         action->set_param("value_desc",value_desc);
 287         action->set_param("type",type);
 288
 289         if(!action->is_ready())
 290         {
 291                 get_ui_interface()->error(_("Action Not Ready"));
 292                 return 0;
 293         }
 294
 295         if(get_instance()->perform_action(action))
 296                 return true;
 297
 298         get_ui_interface()->error(_("Action Failed."));
 299         return false;
 300 }
 301
 302 bool
 303 CanvasInterface::add_value_node(synfig::ValueNode::Handle value_node, synfig::String name)
 304 {
 305         if(name.empty())
 306         {
 307                 get_ui_interface()->error(_("Empty name!"));
 308                 return false;
 309         }
 310
 311         Action::Handle  action(Action::ValueNodeAdd::create());
 312
 313         assert(action);
 314         if(!action)
 315                 return 0;
 316
 317         action->set_param("canvas",get_canvas());
 318         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 319         action->set_param("new",value_node);
 320         action->set_param("name",name);
 321
 322         if(!action->is_ready())
 323         {
 324                 get_ui_interface()->error(_("Action Not Ready"));
 325                 return 0;
 326         }
 327
 328         if(get_instance()->perform_action(action))
 329                 return true;
 330
 331         get_ui_interface()->error(_("Action Failed."));
 332         return false;
 333 }
 334
 335 Action::ParamList
 336 CanvasInterface::generate_param_list(const ValueDesc &value_desc)
 337 {
 338         synfigapp::Action::ParamList param_list;
 339         param_list.add("time",get_time());
 340         param_list.add("canvas_interface",etl::handle<CanvasInterface>(this));
 341         param_list.add("canvas",get_canvas());
 342
 343         param_list.add("value_desc",value_desc);
 344
 345         if(value_desc.parent_is_value_node())
 346                 param_list.add("parent_value_node",value_desc.get_parent_value_node());
 347
 348         if(value_desc.is_value_node())
 349                 param_list.add("value_node",value_desc.get_value_node());
 350
 351         if(value_desc.is_const())
 352                 param_list.add("value",value_desc.get_value());
 353
 354         if(value_desc.parent_is_layer_param())
 355         {
 356                 param_list.add("parent_layer",value_desc.get_layer());
 357                 param_list.add("parent_layer_param",value_desc.get_param_name());
 358         }
 359
 360         {
 361                 synfigapp::SelectionManager::ChildrenList children_list;
 362                 children_list=get_selection_manager()->get_selected_children();
 363                 if(!value_desc.parent_is_canvas() && children_list.size()==1)
 364                 {
 365                         param_list.add("dest",value_desc);
 366                         param_list.add("src",children_list.front().get_value_node());
 367                 }
 368         }
 369         return param_list;
 370 }
 371
 372 Action::ParamList
 373 CanvasInterface::generate_param_list(const std::list<synfigapp::ValueDesc> &value_desc_list)
 374 {
 375         synfigapp::Action::ParamList param_list;
 376         param_list.add("time",get_time());
 377         param_list.add("canvas_interface",etl::handle<CanvasInterface>(this));
 378         param_list.add("canvas",get_canvas());
 379
 380         std::list<synfigapp::ValueDesc>::const_iterator iter;
 381         for(iter=value_desc_list.begin();iter!=value_desc_list.end();++iter)
 382         {
 383                 param_list.add("value_desc",*iter);
 384                 if(iter->is_value_node())
 385                 {
 386                         param_list.add("value_node",iter->get_value_node());
 387                 }
 388         }
 389
 390
 391         return param_list;
 392 }
 393
 394 void
 395 CanvasInterface::set_rend_desc(const synfig::RendDesc &rend_desc)
 396 {
 397         Action::Handle  action(Action::create("canvas_rend_desc_set"));
 398
 399         assert(action);
 400         if(!action)
 401                 return;
 402
 403         action->set_param("canvas",get_canvas());
 404         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 405         action->set_param("rend_desc",rend_desc);
 406
 407         if(!get_instance()->perform_action(action))
 408                 get_ui_interface()->error(_("Action Failed."));
 409 }
 410
 411 bool
 412 CanvasInterface::set_name(const String &x)
 413 {
 414         //! \todo This needs to be converted into an action
 415         get_canvas()->set_name(x);
 416         signal_id_changed_();
 417         return true;
 418 }
 419
 420 bool
 421 CanvasInterface::set_description(const String &x)
 422 {
 423         //! \todo This needs to be converted into an action
 424         get_canvas()->set_description(x);
 425         return true;
 426 }
 427
 428 bool
 429 CanvasInterface::set_id(const String &x)
 430 {
 431         //! \todo This needs to be converted into an action
 432         get_canvas()->set_id(x);
 433         signal_id_changed_();
 434         return true;
 435 }
 436
 437
 438 void
 439 CanvasInterface::jump_to_next_keyframe()
 440 {
 441         synfig::info("Current time: %s",get_time().get_string().c_str());
 442         try
 443         {
 444                 synfig::Keyframe keyframe(*get_canvas()->keyframe_list().find_next(get_time()));
 445                 synfig::info("Jumping to keyframe \"%s\" at %s",keyframe.get_description().c_str(),keyframe.get_time().get_string().c_str());
 446                 set_time(keyframe.get_time());
 447         }
 448         catch(...) { synfig::warning("Unable to find next keyframe"); }
 449 }
 450
 451 void
 452 CanvasInterface::jump_to_prev_keyframe()
 453 {
 454         synfig::info("Current time: %s",get_time().get_string().c_str());
 455         try
 456         {
 457                 synfig::Keyframe keyframe(*get_canvas()->keyframe_list().find_prev(get_time()));
 458                 synfig::info("Jumping to keyframe \"%s\" at %s",keyframe.get_description().c_str(),keyframe.get_time().get_string().c_str());
 459                 set_time(keyframe.get_time());
 460         }
 461         catch(...) { synfig::warning("Unable to find prev keyframe"); }
 462 }
 463
 464 bool
 465 CanvasInterface::import(const synfig::String &filename, bool copy)
 466 {
 467         Action::PassiveGrouper group(get_instance().get(),_("Import Image"));
 468
 469         synfig::info("Attempting to import "+filename);
 470
 471
 472         if(find(filename.begin(),filename.end(),'.')==filename.end())
 473         {
 474                 get_ui_interface()->error("Filename must have an extension!");
 475                 return false;
 476         }
 477
 478         String ext(String(filename.begin()+filename.find_last_of('.')+1,filename.end()));
 479         std::transform(ext.begin(),ext.end(),ext.begin(),&::tolower);
 480
 481         // If this is a SIF file, then we need to do things slightly differently
 482         if(ext=="sif" || ext=="sifz")try
 483         {
 484
 485                 Canvas::Handle outside_canvas(synfig::open_canvas(filename));
 486                 if(!outside_canvas)
 487                         throw String(_("Unable to open this composition"));
 488
 489                 Layer::Handle layer(add_layer_to("PasteCanvas",get_canvas()));
 490                 if(!layer)
 491                         throw String(_("Unable to create \"PasteCanvas\" layer"));
 492                 if(!layer->set_param("canvas",ValueBase(outside_canvas)))
 493                         throw int();
 494
 495                 //layer->set_description(basename(filename));
 496                 signal_layer_new_description()(layer,filename);
 497                 return true;
 498         }
 499         catch(String x)
 500         {
 501                 get_ui_interface()->error(x+" -- "+filename);
 502                 return false;
 503         }
 504         catch(...)
 505         {
 506                 get_ui_interface()->error(_("Uncaught exception when attempting\nto open this composition -- ")+filename);
 507                 return false;
 508         }
 509
 510
 511
 512         if(!Importer::book().count(ext))
 513         {
 514                 get_ui_interface()->error(_("I don't know how to open images of this type -- ")+ext);
 515                 return false;
 516         }
 517
 518         try
 519         {
 520                 Layer::Handle layer(add_layer_to("Import",get_canvas()));
 521                 int w,h;
 522                 if(!layer)
 523                         throw int();
 524                 if(!layer->set_param("filename",ValueBase(filename)))
 525                         throw int();
 526                 w=layer->get_param("_width").get(int());
 527                 h=layer->get_param("_height").get(int());
 528                 if(w&&h)
 529                 {
 530                         Vector size=ValueBase(get_canvas()->rend_desc().get_br()-get_canvas()->rend_desc().get_tl());
 531                         Vector x;
 532                         if(size[0]<size[1])
 533                         {
 534                                 x[0]=size[0];
 535                                 x[1]=size[0]/w*h;
 536                                 if(size[0]<0 ^ size[1]<0)
 537                                         x[1]=-x[1];
 538                         }
 539                         else
 540                         {
 541                                 x[1]=size[1];
 542                                 x[0]=size[1]/h*w;
 543                                 if(size[0]<0 ^ size[1]<0)
 544                                         x[0]=-x[0];
 545                         }
 546                         if(!layer->set_param("tl",ValueBase(-x/2)))
 547                                 throw int();
 548                         if(!layer->set_param("br",ValueBase(x/2)))
 549                                 throw int();
 550                 }
 551                 else
 552                 {
 553                         if(!layer->set_param("tl",ValueBase(get_canvas()->rend_desc().get_tl())))
 554                                 throw int();
 555                         if(!layer->set_param("br",ValueBase(get_canvas()->rend_desc().get_br())))
 556                                 throw int();
 557                 }
 558
 559                 layer->set_description(basename(filename));
 560                 signal_layer_new_description()(layer,filename);
 561
 562                 return true;
 563         }
 564         catch(...)
 565         {
 566                 get_ui_interface()->error("Unable to import "+filename);
 567                 group.cancel();
 568                 return false;
 569         }
 570 }
 571
 572
 573 void
 574 CanvasInterface::waypoint_duplicate(synfigapp::ValueDesc value_desc,synfig::Waypoint waypoint)
 575 {
 576         Action::Handle  action(Action::create("waypoint_set_smart"));
 577
 578         assert(action);
 579         if(!action)
 580                 return;
 581
 582         waypoint.make_unique();
 583         waypoint.set_time(get_time());
 584
 585         ValueNode::Handle value_node(value_desc.get_value_node());
 586
 587         action->set_param("canvas",get_canvas());
 588         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 589         action->set_param("waypoint",waypoint);
 590         action->set_param("time",get_time());
 591         action->set_param("value_node",value_node);
 592
 593         if(!get_instance()->perform_action(action))
 594                 get_ui_interface()->error(_("Action Failed."));
 595 }
 596
 597 void
 598 CanvasInterface::waypoint_remove(synfigapp::ValueDesc value_desc,synfig::Waypoint waypoint)
 599 {
 600         Action::Handle  action(Action::create("waypoint_remove"));
 601
 602         assert(action);
 603         if(!action)
 604                 return;
 605
 606         ValueNode::Handle value_node(value_desc.get_value_node());
 607
 608         action->set_param("canvas",get_canvas());
 609         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 610         action->set_param("waypoint",waypoint);
 611         action->set_param("value_node",value_node);
 612
 613         if(!get_instance()->perform_action(action))
 614                 get_ui_interface()->error(_("Action Failed."));
 615 }
 616
 617
 618 void
 619 CanvasInterface::auto_export(ValueNode::Handle value_node)
 620 {
 621 /*
 622         // Check to see if we are already exported.
 623         if(value_node->is_exported())
 624                 return;
 625
 626         Action::Handle  action(Action::create("value_node_add"));
 627
 628         assert(action);
 629         if(!action)
 630                 return;
 631
 632         String name(strprintf(_("Unnamed%08d"),synfig::UniqueID().get_uid()));
 633
 634         action->set_param("canvas",get_canvas());
 635         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 636         action->set_param("new",value_node);
 637         action->set_param("name",name);
 638
 639         if(!get_instance()->perform_action(action))
 640                 get_ui_interface()->error(_("Action Failed."));
 641 */
 642 }
 643
 644 void
 645 CanvasInterface::auto_export(const ValueDesc& value_desc)
 646 {
 647         // THIS FUNCTION IS DEPRECATED, AND IS NOW A STUB.
 648 #if 0
 649         // Check to see if we are already exported.
 650         if(value_desc.is_exported())
 651                 return;
 652
 653         Action::Handle  action(Action::create("value_desc_export"));
 654
 655         assert(action);
 656         if(!action)
 657                 return;
 658
 659         String name(strprintf(_("Unnamed%08d"),synfig::UniqueID().get_uid()));
 660
 661         action->set_param("canvas",get_canvas());
 662         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 663         action->set_param("value_desc",value_desc);
 664         action->set_param("name",name);
 665
 666         if(!get_instance()->perform_action(action))
 667                 get_ui_interface()->error(_("Action Failed."));
 668 #endif
 669 }
 670
 671 bool
 672 CanvasInterface::change_value(synfigapp::ValueDesc value_desc,synfig::ValueBase new_value)
 673 {
 674         // If this isn't really a change, then don't bother
 675         if(new_value==value_desc.get_value(get_time()))
 676                 return true;
 677
 678         // If this change needs to take place elsewhere, then so be it.
 679         if(value_desc.get_canvas() && value_desc.get_canvas()->get_root()!=get_canvas()->get_root())do
 680         {
 681                 etl::handle<Instance> instance;
 682                 instance=find_instance(value_desc.get_canvas()->get_root());
 683
 684                 if(instance)
 685                         return instance->find_canvas_interface(value_desc.get_canvas())->change_value(value_desc,new_value);
 686                 else
 687                 {
 688                         get_ui_interface()->error(_("The value you are trying to edit is in a composition\nwhich doesn't seem to be open. Open that composition and you\nshould be able to edit this value as normal."));
 689                         return false;
 690                 }
 691         }while(0);
 692 #ifdef _DEBUG
 693         else
 694         { synfig::warning("Can't get canvas from value desc...?"); }
 695 #endif
 696
 697         synfigapp::Action::Handle action(synfigapp::Action::create("value_desc_set"));
 698         if(!action)
 699         {
 700                 return false;
 701         }
 702
 703         action->set_param("canvas",get_canvas());
 704         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 705         action->set_param("time",get_time());
 706         action->set_param("value_desc",value_desc);
 707         action->set_param("new_value",new_value);
 708
 709         return get_instance()->perform_action(action);
 710 }
 711
 712 void
 713 CanvasInterface::set_meta_data(const synfig::String& key,const synfig::String& data)
 714 {
 715         get_canvas()->set_meta_data(key,data);
 716 }
 717
 718
 719 // this function goes with find_important_value_descs()
 720 static int
 721 _process_value_desc(const synfigapp::ValueDesc& value_desc,std::vector<synfigapp::ValueDesc>& out, synfig::GUIDSet& guid_set)
 722 {
 723         int ret(0);
 724
 725         if(value_desc.get_value_type()==ValueBase::TYPE_CANVAS)
 726         {
 727                 Canvas::Handle canvas;
 728                 canvas=value_desc.get_value().get(canvas);
 729                 if(!canvas || !canvas->is_inline())
 730                         return ret;
 731                 ret+=CanvasInterface::find_important_value_descs(canvas,out,guid_set);
 732         }
 733
 734         if(value_desc.is_value_node())
 735         {
 736                 ValueNode::Handle value_node(value_desc.get_value_node());
 737
 738                 if(guid_set.count(value_node->get_guid()))
 739                         return ret;
 740                 guid_set.insert(value_node->get_guid());
 741
 742                 if(LinkableValueNode::Handle::cast_dynamic(value_node))
 743                 {
 744                         if(ValueNode_DynamicList::Handle::cast_dynamic(value_node))
 745                         {
 746                                 out.push_back(value_desc);
 747                                 ret++;
 748                         }
 749                         // Process the linkable ValueNode's children
 750                         LinkableValueNode::Handle value_node(LinkableValueNode::Handle::cast_dynamic(value_node));
 751                         int i;
 752                         for(i=0;i<value_node->link_count();i++)
 753                         {
 754                                 ValueNode::Handle link(value_node->get_link(i));
 755                                 if(!link->is_exported())
 756                                         ret+=_process_value_desc(ValueDesc(value_node,i),out,guid_set);
 757                         }
 758                 }
 759                 else if(ValueNode_Animated::Handle::cast_dynamic(value_node))
 760                 {
 761                         out.push_back(value_desc);
 762                         ret++;
 763                 }
 764         }
 765
 766         return ret;
 767 }
 768
 769 int
 770 CanvasInterface::find_important_value_descs(synfig::Canvas::Handle canvas,std::vector<synfigapp::ValueDesc>& out,synfig::GUIDSet& guid_set)
 771 {
 772         int ret(0);
 773         if(!canvas->is_inline())
 774         {
 775                 ValueNodeList::const_iterator iter;
 776
 777                 for(
 778                         iter=canvas->value_node_list().begin();
 779                         iter!=canvas->value_node_list().end();
 780                         ++iter)
 781                         ret+=_process_value_desc(ValueDesc(canvas,(*iter)->get_id()),out,guid_set);
 782         }
 783
 784         Canvas::const_iterator iter;
 785
 786         for(iter=canvas->begin();iter!=canvas->end();++iter)
 787         {
 788                 Layer::Handle layer(*iter);
 789
 790                 Layer::DynamicParamList::const_iterator iter;
 791                 for(
 792                         iter=layer->dynamic_param_list().begin();
 793                         iter!=layer->dynamic_param_list().end();
 794                         ++iter)
 795                 {
 796                         if(!iter->second->is_exported())
 797                                 ret+=_process_value_desc(ValueDesc(layer,iter->first),out,guid_set);
 798                 }
 799                 ValueBase value(layer->get_param("canvas"));
 800                 if(value.is_valid())
 801                         ret+=_process_value_desc(ValueDesc(layer,"canvas"),out,guid_set);
 802         }
 803
 804         return ret;
 805 }
 806
 807 int
 808 CanvasInterface::find_important_value_descs(std::vector<synfigapp::ValueDesc>& out)
 809 {
 810         synfig::GUIDSet tmp;
 811         return find_important_value_descs(get_canvas(),out,tmp);
 812 }
 813
 814 void
 815 CanvasInterface::seek_frame(int frames)
 816 {
 817         if(!frames)
 818                 return;
 819         float fps(get_canvas()->rend_desc().get_frame_rate());
 820         Time newtime(get_time()+(float)frames/fps);
 821         newtime=newtime.round(fps);
 822
 823         if(newtime<=get_canvas()->rend_desc().get_frame_start())
 824                 newtime=get_canvas()->rend_desc().get_frame_start();
 825         if(newtime>=get_canvas()->rend_desc().get_frame_end())
 826                 newtime=get_canvas()->rend_desc().get_frame_end();
 827         set_time(newtime);
 828 }
 829
 830 void
 831 CanvasInterface::seek_time(synfig::Time time)
 832 {
 833         if(!time)
 834                 return;
 835
 836         float fps(get_canvas()->rend_desc().get_frame_rate());
 837
 838         if(time>=synfig::Time::end())
 839         {
 840                 set_time(get_canvas()->rend_desc().get_time_end());
 841                 return;
 842         }
 843         if(time<=synfig::Time::begin())
 844         {
 845                 set_time(get_canvas()->rend_desc().get_time_end());
 846                 return;
 847         }
 848
 849         Time newtime(get_time()+time);
 850         newtime=newtime.round(fps);
 851
 852         if(newtime<=get_canvas()->rend_desc().get_time_start())
 853                 newtime=get_canvas()->rend_desc().get_time_start();
 854         if(newtime>=get_canvas()->rend_desc().get_time_end())
 855                 newtime=get_canvas()->rend_desc().get_time_end();
 856         set_time(newtime);
 857 }