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 **      Copyright (c) 2007 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 #ifdef USING_PCH
  27 #       include "pch.h"
  28 #else
  29 #ifdef HAVE_CONFIG_H
  30 #       include <config.h>
  31 #endif
  32
  33 //#include <iostream>
  34
  35 #include <ETL/clock>
  36 #include <synfig/valuenode_scale.h>
  37 #include <synfig/valuenode_timedswap.h>
  38 #include <synfig/valuenode_composite.h>
  39 #include <synfig/valuenode_subtract.h>
  40 #include <synfig/valuenode_linear.h>
  41 #include <synfig/valuenode_reference.h>
  42 #include <synfig/valuenode_twotone.h>
  43 #include <synfig/valuenode_stripes.h>
  44
  45 #include <synfig/waypoint.h>
  46 #include <synfig/loadcanvas.h>
  47 #include <synfig/importer.h>
  48 #include <synfig/guidset.h>
  49
  50 #include "canvasinterface.h"
  51 #include "instance.h"
  52
  53 #include "actions/layeradd.h"
  54 #include "actions/valuedescconvert.h"
  55 #include "actions/valuenodeadd.h"
  56 #include "actions/editmodeset.h"
  57 #include "action_system.h"
  58
  59 #include "main.h"
  60
  61 #include <synfig/gradient.h>
  62
  63 #include "general.h"
  64
  65 #endif
  66
  67 /* === U S I N G =========================================================== */
  68
  69 using namespace std;
  70 using namespace etl;
  71 using namespace synfig;
  72 using namespace synfigapp;
  73
  74 /* === M A C R O S ========================================================= */
  75
  76 /* === G L O B A L S ======================================================= */
  77
  78 /* === P R O C E D U R E S ================================================= */
  79
  80 /* === M E T H O D S ======================================================= */
  81
  82 CanvasInterface::CanvasInterface(etl::loose_handle<Instance> instance,etl::handle<synfig::Canvas> canvas):
  83         instance_(instance),
  84         canvas_(canvas),
  85         cur_time_(canvas->rend_desc().get_frame_start()),
  86         mode_(MODE_NORMAL|MODE_ANIMATE_PAST|MODE_ANIMATE_FUTURE)
  87 {
  88         set_selection_manager(get_instance()->get_selection_manager());
  89         set_ui_interface(get_instance()->get_ui_interface());
  90 }
  91
  92 CanvasInterface::~CanvasInterface()
  93 {
  94         synfig::info("synfigapp::CanvasInterface::~CanvasInterface(): Deleted");
  95 }
  96
  97 void
  98 CanvasInterface::set_time(synfig::Time x)
  99 {
 100         if(get_canvas()->rend_desc().get_frame_rate())
 101         {
 102                 float fps(get_canvas()->rend_desc().get_frame_rate());
 103                 Time r(x.round(fps));
 104                 //synfig::info("CanvasInterface::set_time(): %s rounded to %s\n",x.get_string(fps).c_str(),r.get_string(fps).c_str());
 105                 x=r;
 106         }
 107         if(cur_time_.is_equal(x))
 108                 return;
 109         get_canvas()->set_time(cur_time_=x);
 110
 111         // update the time in all the child canvases
 112         Canvas::Children children = get_canvas()->get_root()->children();
 113         handle<CanvasInterface> interface;
 114         for (Canvas::Children::iterator iter = children.begin(); iter != children.end(); iter++)
 115                 if ((interface = get_instance()->find_canvas_interface(*iter)) != this)
 116                         interface->set_time(interface->get_canvas()->get_time());
 117
 118         signal_time_changed()();
 119         signal_dirty_preview()();
 120 }
 121
 122 synfig::Time
 123 CanvasInterface::get_time()const
 124 {
 125         return cur_time_;
 126 }
 127
 128 void
 129 CanvasInterface::refresh_current_values()
 130 {
 131         get_canvas()->set_time(cur_time_);
 132         signal_time_changed()();
 133         signal_dirty_preview()();
 134 }
 135
 136 etl::handle<CanvasInterface>
 137 CanvasInterface::create(etl::loose_handle<Instance> instance, etl::handle<synfig::Canvas> canvas)
 138 {
 139         etl::handle<CanvasInterface> intrfc;
 140         intrfc=new CanvasInterface(instance,canvas);
 141         instance->canvas_interface_list().push_front(intrfc);
 142         return intrfc;
 143 }
 144
 145 void
 146 CanvasInterface::set_mode(Mode x)
 147 {
 148         Action::Handle  action(Action::EditModeSet::create());
 149
 150         assert(action);
 151
 152         action->set_param("canvas",get_canvas());
 153         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 154         action->set_param("edit_mode",x);
 155
 156         if(!action->is_ready())
 157         {
 158                 get_ui_interface()->error(_("Action Not Ready, unable to change mode"));
 159                 assert(0);
 160                 return;
 161         }
 162
 163         if(!get_instance()->perform_action(action))
 164                 get_ui_interface()->error(_("Unable to change mode"));
 165
 166 //      mode_=x;
 167 //      signal_mode_changed_(x);
 168 }
 169
 170 CanvasInterface::Mode
 171 CanvasInterface::get_mode()const
 172 {
 173         return mode_;
 174 }
 175
 176
 177
 178 Layer::Handle
 179 CanvasInterface::add_layer_to(synfig::String name, synfig::Canvas::Handle canvas, int depth)
 180 {
 181         synfigapp::Action::PassiveGrouper group(get_instance().get(),_("Add Layer To"));
 182
 183         Layer::Handle   layer(Layer::create(name));
 184
 185         assert(layer);
 186
 187         if(!layer)
 188                 return 0;
 189
 190         if(canvas!=get_canvas() && !canvas->is_inline())
 191         {
 192                 synfig::error("Bad canvas passed to \"add_layer_to\"");
 193                 return 0;
 194         }
 195
 196         // automatically export the Index parameter of new Duplicate layers
 197         if (name == "duplicate")
 198                 for (int i = 1; ; i++)
 199                 {
 200                         String name = strprintf(_("Index %d"), i);
 201                         try
 202                         {
 203                                 canvas->find_value_node(name);
 204                         }
 205                         catch (Exception::IDNotFound x)
 206                         {
 207                                 add_value_node(layer->dynamic_param_list().find("index")->second, name);
 208                                 break;
 209                         }
 210                 }
 211
 212         layer->set_canvas(canvas);
 213
 214         // Apply some defaults
 215         if(layer->set_param("fg",synfigapp::Main::get_foreground_color()))
 216                 layer->set_param("bg",synfigapp::Main::get_background_color());
 217         else
 218                 layer->set_param("color",synfigapp::Main::get_foreground_color());
 219
 220         layer->set_param("width",synfigapp::Main::get_bline_width().units(get_canvas()->rend_desc()));
 221         layer->set_param("gradient",synfigapp::Main::get_gradient());
 222         if(name!="zoom")
 223                 layer->set_param("amount",synfigapp::Main::get_opacity());
 224         layer->set_param("blend_method",synfigapp::Main::get_blend_method());
 225
 226         {
 227                 // Grab the layer's list of parameters
 228                 Layer::ParamList paramlist=layer->get_param_list();
 229                 Layer::ParamList::iterator iter;
 230                 for(iter=paramlist.begin();iter!=paramlist.end();++iter)
 231                 {
 232                         ValueNode::Handle value_node;
 233
 234                         if(iter->second.get_type()==ValueBase::TYPE_LIST)
 235                                 value_node=LinkableValueNode::create("dynamic_list",iter->second);
 236                         else if(LinkableValueNode::check_type("composite",iter->second.get_type()) &&
 237                                 (iter->second.get_type()!=ValueBase::TYPE_COLOR && iter->second.get_type()!=ValueBase::TYPE_VECTOR)
 238                         )
 239                                 value_node=LinkableValueNode::create("composite",iter->second);
 240
 241                         if(value_node)
 242                                 layer->connect_dynamic_param(iter->first,value_node);
 243                 }
 244         }
 245
 246         // Action to add the layer
 247         Action::Handle  action(Action::LayerAdd::create());
 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("new",layer);
 256
 257         if(!action->is_ready())
 258         {
 259                 get_ui_interface()->error(_("Action Not Ready"));
 260                 return 0;
 261         }
 262
 263         if(!get_instance()->perform_action(action))
 264         {
 265                 get_ui_interface()->error(_("Action Failed."));
 266                 return 0;
 267         }
 268
 269         synfig::info("DEPTH=%d",depth);
 270         // Action to move the layer (if necessary)
 271         if(depth>0)
 272         {
 273                 Action::Handle  action(Action::create("layer_move"));
 274
 275                 assert(action);
 276                 if(!action)
 277                         return 0;
 278
 279                 action->set_param("canvas",canvas);
 280                 action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 281                 action->set_param("layer",layer);
 282                 action->set_param("new_index",depth);
 283
 284                 if(!action->is_ready())
 285                 {
 286                         get_ui_interface()->error(_("Move Action Not Ready"));
 287                         return 0;
 288                 }
 289
 290                 if(!get_instance()->perform_action(action))
 291                 {
 292                         get_ui_interface()->error(_("Move Action Failed."));
 293                         return 0;
 294                 }
 295         }
 296
 297
 298         return layer;
 299 }
 300
 301
 302 bool
 303 CanvasInterface::convert(ValueDesc value_desc, synfig::String type)
 304 {
 305         Action::Handle  action(Action::ValueDescConvert::create());
 306
 307         assert(action);
 308         if(!action)
 309                 return 0;
 310
 311         action->set_param("canvas",get_canvas());
 312         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 313         action->set_param("value_desc",value_desc);
 314         action->set_param("type",type);
 315         action->set_param("time",get_time());
 316
 317         if(!action->is_ready())
 318         {
 319                 get_ui_interface()->error(_("Action Not Ready"));
 320                 return 0;
 321         }
 322
 323         if(get_instance()->perform_action(action))
 324                 return true;
 325
 326         get_ui_interface()->error(_("Action Failed."));
 327         return false;
 328 }
 329
 330 bool
 331 CanvasInterface::add_value_node(synfig::ValueNode::Handle value_node, synfig::String name)
 332 {
 333         if(name.empty())
 334         {
 335                 get_ui_interface()->error(_("Empty name!"));
 336                 return false;
 337         }
 338
 339         Action::Handle  action(Action::ValueNodeAdd::create());
 340
 341         assert(action);
 342         if(!action)
 343                 return 0;
 344
 345         action->set_param("canvas",get_canvas());
 346         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 347         action->set_param("new",value_node);
 348         action->set_param("name",name);
 349
 350         if(!action->is_ready())
 351         {
 352                 get_ui_interface()->error(_("Action Not Ready"));
 353                 return 0;
 354         }
 355
 356         if(get_instance()->perform_action(action))
 357                 return true;
 358
 359         get_ui_interface()->error(_("Action Failed."));
 360         return false;
 361 }
 362
 363 Action::ParamList
 364 CanvasInterface::generate_param_list(const ValueDesc &value_desc)
 365 {
 366         synfigapp::Action::ParamList param_list;
 367         param_list.add("time",get_time());
 368         param_list.add("canvas_interface",etl::handle<CanvasInterface>(this));
 369         param_list.add("canvas",get_canvas());
 370
 371         param_list.add("value_desc",value_desc);
 372
 373         if(value_desc.parent_is_value_node())
 374                 param_list.add("parent_value_node",value_desc.get_parent_value_node());
 375
 376         if(value_desc.is_value_node())
 377                 param_list.add("value_node",value_desc.get_value_node());
 378
 379         if(value_desc.is_const())
 380                 param_list.add("value",value_desc.get_value());
 381
 382         if(value_desc.parent_is_layer_param())
 383         {
 384                 param_list.add("parent_layer",value_desc.get_layer());
 385                 param_list.add("parent_layer_param",value_desc.get_param_name());
 386         }
 387
 388         {
 389                 synfigapp::SelectionManager::ChildrenList children_list;
 390                 children_list=get_selection_manager()->get_selected_children();
 391                 if(!value_desc.parent_is_canvas() && children_list.size()==1)
 392                 {
 393                         param_list.add("dest",value_desc);
 394                         param_list.add("src",children_list.front().get_value_node());
 395                 }
 396         }
 397         return param_list;
 398 }
 399
 400 Action::ParamList
 401 CanvasInterface::generate_param_list(const std::list<synfigapp::ValueDesc> &value_desc_list)
 402 {
 403         synfigapp::Action::ParamList param_list;
 404         param_list.add("time",get_time());
 405         param_list.add("canvas_interface",etl::handle<CanvasInterface>(this));
 406         param_list.add("canvas",get_canvas());
 407
 408         std::list<synfigapp::ValueDesc>::const_iterator iter;
 409         for(iter=value_desc_list.begin();iter!=value_desc_list.end();++iter)
 410         {
 411                 param_list.add("value_desc",*iter);
 412                 if(iter->is_value_node())
 413                 {
 414                         param_list.add("value_node",iter->get_value_node());
 415                 }
 416         }
 417
 418
 419         return param_list;
 420 }
 421
 422 void
 423 CanvasInterface::set_rend_desc(const synfig::RendDesc &rend_desc)
 424 {
 425         Action::Handle  action(Action::create("canvas_rend_desc_set"));
 426
 427         assert(action);
 428         if(!action)
 429                 return;
 430
 431         action->set_param("canvas",get_canvas());
 432         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 433         action->set_param("rend_desc",rend_desc);
 434
 435         if(!get_instance()->perform_action(action))
 436                 get_ui_interface()->error(_("Action Failed."));
 437 }
 438
 439 bool
 440 CanvasInterface::set_name(const synfig::String &x)
 441 {
 442         //! \todo This needs to be converted into an action
 443         get_canvas()->set_name(x);
 444         signal_id_changed_();
 445         return true;
 446 }
 447
 448 bool
 449 CanvasInterface::set_description(const synfig::String &x)
 450 {
 451         //! \todo This needs to be converted into an action
 452         get_canvas()->set_description(x);
 453         return true;
 454 }
 455
 456 bool
 457 CanvasInterface::set_id(const synfig::String &x)
 458 {
 459         //! \todo This needs to be converted into an action
 460         get_canvas()->set_id(x);
 461         signal_id_changed_();
 462         return true;
 463 }
 464
 465
 466 void
 467 CanvasInterface::jump_to_next_keyframe()
 468 {
 469         synfig::info("Current time: %s",get_time().get_string().c_str());
 470         try
 471         {
 472                 synfig::Keyframe keyframe(*get_canvas()->keyframe_list().find_next(get_time()));
 473                 synfig::info("Jumping to keyframe \"%s\" at %s",keyframe.get_description().c_str(),keyframe.get_time().get_string().c_str());
 474                 set_time(keyframe.get_time());
 475         }
 476         catch(...) { synfig::warning("Unable to find next keyframe"); }
 477 }
 478
 479 void
 480 CanvasInterface::jump_to_prev_keyframe()
 481 {
 482         synfig::info("Current time: %s",get_time().get_string().c_str());
 483         try
 484         {
 485                 synfig::Keyframe keyframe(*get_canvas()->keyframe_list().find_prev(get_time()));
 486                 synfig::info("Jumping to keyframe \"%s\" at %s",keyframe.get_description().c_str(),keyframe.get_time().get_string().c_str());
 487                 set_time(keyframe.get_time());
 488         }
 489         catch(...) { synfig::warning("Unable to find prev keyframe"); }
 490 }
 491
 492 bool
 493 CanvasInterface::import(const synfig::String &filename, bool /*copy*/)
 494 {
 495         Action::PassiveGrouper group(get_instance().get(),_("Import Image"));
 496
 497         synfig::info("Attempting to import "+filename);
 498
 499         if (filename_extension(filename) == "")
 500         {
 501                 get_ui_interface()->error(_("Filename must have an extension!"));
 502                 return false;
 503         }
 504
 505         String ext(filename_extension(filename));
 506         if (ext.size()) ext = ext.substr(1); // skip initial '.'
 507         std::transform(ext.begin(),ext.end(),ext.begin(),&::tolower);
 508
 509         // If this is a SIF file, then we need to do things slightly differently
 510         if(ext=="sif" || ext=="sifz")try
 511         {
 512
 513                 Canvas::Handle outside_canvas(synfig::open_canvas(filename));
 514                 if(!outside_canvas)
 515                         throw String(_("Unable to open this composition"));
 516
 517                 Layer::Handle layer(add_layer_to("PasteCanvas",get_canvas()));
 518                 if(!layer)
 519                         throw String(_("Unable to create \"Paste Canvas\" layer"));
 520                 if(!layer->set_param("canvas",ValueBase(outside_canvas)))
 521                         throw int();
 522
 523                 //layer->set_description(basename(filename));
 524                 signal_layer_new_description()(layer,filename);
 525                 return true;
 526         }
 527         catch(String x)
 528         {
 529                 get_ui_interface()->error(x+" -- "+filename);
 530                 return false;
 531         }
 532         catch(...)
 533         {
 534                 get_ui_interface()->error(_("Uncaught exception when attempting\nto open this composition -- ")+filename);
 535                 return false;
 536         }
 537
 538         if(!Importer::book().count(ext))
 539         {
 540                 get_ui_interface()->error(_("I don't know how to open images of this type -- ")+ext);
 541                 return false;
 542         }
 543
 544         try
 545         {
 546                 Layer::Handle layer(add_layer_to("Import",get_canvas()));
 547                 int w,h;
 548                 if(!layer)
 549                         throw int();
 550                 if(!layer->set_param("filename",ValueBase(filename)))
 551                         throw int();
 552                 w=layer->get_param("_width").get(int());
 553                 h=layer->get_param("_height").get(int());
 554                 if(w&&h)
 555                 {
 556                         Vector size=ValueBase(get_canvas()->rend_desc().get_br()-get_canvas()->rend_desc().get_tl());
 557                         Vector x;
 558                         if(size[0]<size[1])
 559                         {
 560                                 x[0]=size[0];
 561                                 x[1]=size[0]/w*h;
 562                                 if(size[0]<0 ^ size[1]<0)
 563                                         x[1]=-x[1];
 564                         }
 565                         else
 566                         {
 567                                 x[1]=size[1];
 568                                 x[0]=size[1]/h*w;
 569                                 if(size[0]<0 ^ size[1]<0)
 570                                         x[0]=-x[0];
 571                         }
 572                         if(!layer->set_param("tl",ValueBase(-x/2)))
 573                                 throw int();
 574                         if(!layer->set_param("br",ValueBase(x/2)))
 575                                 throw int();
 576                 }
 577                 else
 578                 {
 579                         if(!layer->set_param("tl",ValueBase(get_canvas()->rend_desc().get_tl())))
 580                                 throw int();
 581                         if(!layer->set_param("br",ValueBase(get_canvas()->rend_desc().get_br())))
 582                                 throw int();
 583                 }
 584
 585                 layer->set_description(basename(filename));
 586                 signal_layer_new_description()(layer,filename);
 587
 588                 return true;
 589         }
 590         catch(...)
 591         {
 592                 get_ui_interface()->error("Unable to import "+filename);
 593                 group.cancel();
 594                 return false;
 595         }
 596 }
 597
 598
 599 void
 600 CanvasInterface::waypoint_duplicate(synfigapp::ValueDesc value_desc,synfig::Waypoint waypoint)
 601 {
 602         Action::Handle  action(Action::create("waypoint_set_smart"));
 603
 604         assert(action);
 605         if(!action)
 606                 return;
 607
 608         waypoint.make_unique();
 609         waypoint.set_time(get_time());
 610
 611         ValueNode::Handle value_node(value_desc.get_value_node());
 612
 613         action->set_param("canvas",get_canvas());
 614         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 615         action->set_param("waypoint",waypoint);
 616         action->set_param("time",get_time());
 617         action->set_param("value_node",value_node);
 618
 619         if(!get_instance()->perform_action(action))
 620                 get_ui_interface()->error(_("Action Failed."));
 621 }
 622
 623 void
 624 CanvasInterface::waypoint_remove(synfigapp::ValueDesc value_desc,synfig::Waypoint waypoint)
 625 {
 626         Action::Handle  action(Action::create("waypoint_remove"));
 627
 628         assert(action);
 629         if(!action)
 630                 return;
 631
 632         ValueNode::Handle value_node(value_desc.get_value_node());
 633
 634         action->set_param("canvas",get_canvas());
 635         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 636         action->set_param("waypoint",waypoint);
 637         action->set_param("value_node",value_node);
 638
 639         if(!get_instance()->perform_action(action))
 640                 get_ui_interface()->error(_("Action Failed."));
 641 }
 642
 643
 644 void
 645 CanvasInterface::auto_export(synfig::ValueNode::Handle /*value_node*/)
 646 {
 647 /*
 648         // Check to see if we are already exported.
 649         if(value_node->is_exported())
 650                 return;
 651
 652         Action::Handle  action(Action::create("value_node_add"));
 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("new",value_node);
 663         action->set_param("name",name);
 664
 665         if(!get_instance()->perform_action(action))
 666                 get_ui_interface()->error(_("Action Failed."));
 667 */
 668 }
 669
 670 void
 671 CanvasInterface::auto_export(const ValueDesc& /*value_desc*/)
 672 {
 673         // THIS FUNCTION IS DEPRECATED, AND IS NOW A STUB.
 674 #if 0
 675         // Check to see if we are already exported.
 676         if(value_desc.is_exported())
 677                 return;
 678
 679         Action::Handle  action(Action::create("value_desc_export"));
 680
 681         assert(action);
 682         if(!action)
 683                 return;
 684
 685         String name(strprintf(_("Unnamed%08d"),synfig::UniqueID().get_uid()));
 686
 687         action->set_param("canvas",get_canvas());
 688         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 689         action->set_param("value_desc",value_desc);
 690         action->set_param("name",name);
 691
 692         if(!get_instance()->perform_action(action))
 693                 get_ui_interface()->error(_("Action Failed."));
 694 #endif
 695 }
 696
 697 bool
 698 CanvasInterface::change_value(synfigapp::ValueDesc value_desc,synfig::ValueBase new_value)
 699 {
 700         // If this isn't really a change, then don't bother
 701         if(new_value==value_desc.get_value(get_time()))
 702                 return true;
 703
 704         // If this change needs to take place elsewhere, then so be it.
 705         if(value_desc.get_canvas() && value_desc.get_canvas()->get_root()!=get_canvas()->get_root())do
 706         {
 707                 etl::handle<Instance> instance;
 708                 instance=find_instance(value_desc.get_canvas()->get_root());
 709
 710                 if(instance)
 711                         return instance->find_canvas_interface(value_desc.get_canvas())->change_value(value_desc,new_value);
 712                 else
 713                 {
 714                         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."));
 715                         return false;
 716                 }
 717         }while(0);
 718 #ifdef _DEBUG
 719         else
 720         { synfig::warning("Can't get canvas from value desc...?"); }
 721 #endif
 722
 723         synfigapp::Action::Handle action(synfigapp::Action::create("value_desc_set"));
 724         if(!action)
 725         {
 726                 return false;
 727         }
 728
 729         action->set_param("canvas",get_canvas());
 730         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 731         action->set_param("time",get_time());
 732         action->set_param("value_desc",value_desc);
 733         action->set_param("new_value",new_value);
 734
 735         return get_instance()->perform_action(action);
 736 }
 737
 738 void
 739 CanvasInterface::set_meta_data(const synfig::String& key,const synfig::String& data)
 740 {
 741         get_canvas()->set_meta_data(key,data);
 742 }
 743
 744
 745 // this function goes with find_important_value_descs()
 746 static int
 747 _process_value_desc(const synfigapp::ValueDesc& value_desc,std::vector<synfigapp::ValueDesc>& out, synfig::GUIDSet& guid_set)
 748 {
 749         int ret(0);
 750
 751         if(value_desc.get_value_type()==ValueBase::TYPE_CANVAS)
 752         {
 753                 Canvas::Handle canvas;
 754                 canvas=value_desc.get_value().get(canvas);
 755                 if(!canvas || !canvas->is_inline())
 756                         return ret;
 757                 ret+=CanvasInterface::find_important_value_descs(canvas,out,guid_set);
 758         }
 759
 760         if(value_desc.is_value_node())
 761         {
 762                 ValueNode::Handle value_node(value_desc.get_value_node());
 763
 764                 if(guid_set.count(value_node->get_guid()))
 765                         return ret;
 766                 guid_set.insert(value_node->get_guid());
 767
 768                 if(LinkableValueNode::Handle::cast_dynamic(value_node))
 769                 {
 770                         if(ValueNode_DynamicList::Handle::cast_dynamic(value_node))
 771                         {
 772                                 out.push_back(value_desc);
 773                                 ret++;
 774                         }
 775                         // Process the linkable ValueNode's children
 776                         LinkableValueNode::Handle value_node_copy(LinkableValueNode::Handle::cast_dynamic(value_node));
 777                         int i;
 778                         for(i=0;i<value_node_copy->link_count();i++)
 779                         {
 780                                 ValueNode::Handle link(value_node_copy->get_link(i));
 781                                 if(!link->is_exported())
 782                                         ret+=_process_value_desc(ValueDesc(value_node_copy,i),out,guid_set);
 783                         }
 784                 }
 785                 else if(ValueNode_Animated::Handle::cast_dynamic(value_node))
 786                 {
 787                         out.push_back(value_desc);
 788                         ret++;
 789                 }
 790         }
 791
 792         return ret;
 793 }
 794
 795 int
 796 CanvasInterface::find_important_value_descs(synfig::Canvas::Handle canvas,std::vector<synfigapp::ValueDesc>& out,synfig::GUIDSet& guid_set)
 797 {
 798         int ret(0);
 799         if(!canvas->is_inline())
 800         {
 801                 ValueNodeList::const_iterator iter;
 802
 803                 for(
 804                         iter=canvas->value_node_list().begin();
 805                         iter!=canvas->value_node_list().end();
 806                         ++iter)
 807                         ret+=_process_value_desc(ValueDesc(canvas,(*iter)->get_id()),out,guid_set);
 808         }
 809
 810         Canvas::const_iterator iter;
 811
 812         for(iter=canvas->begin();iter!=canvas->end();++iter)
 813         {
 814                 Layer::Handle layer(*iter);
 815
 816                 Layer::DynamicParamList::const_iterator iter;
 817                 for(
 818                         iter=layer->dynamic_param_list().begin();
 819                         iter!=layer->dynamic_param_list().end();
 820                         ++iter)
 821                 {
 822                         if(!iter->second->is_exported())
 823                                 ret+=_process_value_desc(ValueDesc(layer,iter->first),out,guid_set);
 824                 }
 825                 ValueBase value(layer->get_param("canvas"));
 826                 if(value.is_valid())
 827                         ret+=_process_value_desc(ValueDesc(layer,"canvas"),out,guid_set);
 828         }
 829
 830         return ret;
 831 }
 832
 833 int
 834 CanvasInterface::find_important_value_descs(std::vector<synfigapp::ValueDesc>& out)
 835 {
 836         synfig::GUIDSet tmp;
 837         return find_important_value_descs(get_canvas(),out,tmp);
 838 }
 839
 840 void
 841 CanvasInterface::seek_frame(int frames)
 842 {
 843         if(!frames)
 844                 return;
 845         float fps(get_canvas()->rend_desc().get_frame_rate());
 846         Time newtime(get_time()+(float)frames/fps);
 847         newtime=newtime.round(fps);
 848
 849         if(newtime<=get_canvas()->rend_desc().get_time_start())
 850                 newtime=get_canvas()->rend_desc().get_time_start();
 851         if(newtime>=get_canvas()->rend_desc().get_time_end())
 852                 newtime=get_canvas()->rend_desc().get_time_end();
 853         set_time(newtime);
 854 }
 855
 856 void
 857 CanvasInterface::seek_time(synfig::Time time)
 858 {
 859         if(!time)
 860                 return;
 861
 862         float fps(get_canvas()->rend_desc().get_frame_rate());
 863
 864         if(time>=synfig::Time::end())
 865         {
 866                 set_time(get_canvas()->rend_desc().get_time_end());
 867                 return;
 868         }
 869         if(time<=synfig::Time::begin())
 870         {
 871                 set_time(get_canvas()->rend_desc().get_time_start());
 872                 return;
 873         }
 874
 875         Time newtime(get_time()+time);
 876         newtime=newtime.round(fps);
 877
 878         if(newtime<=get_canvas()->rend_desc().get_time_start())
 879                 newtime=get_canvas()->rend_desc().get_time_start();
 880         if(newtime>=get_canvas()->rend_desc().get_time_end())
 881                 newtime=get_canvas()->rend_desc().get_time_end();
 882         set_time(newtime);
 883 }