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

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