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         {
 381                 // Fix 1868911: if we put a ValueBase holding a Canvas handle
 382                 // into the param_list and then export the canvas, the handle
 383                 // will miss out of having its reference count reduced,
 384                 // because by the time the handle is destructed the canvas
 385                 // will no longer be inline.  So let's not propogate that
 386                 // ValueBase any further than here.
 387                 if (value_desc.get_value_type() == ValueBase::TYPE_CANVAS)
 388                         param_list.add("value",Canvas::LooseHandle(value_desc.get_value().get(Canvas::LooseHandle())));
 389                 else
 390                         param_list.add("value",value_desc.get_value());
 391         }
 392
 393         if(value_desc.parent_is_layer_param())
 394         {
 395                 param_list.add("parent_layer",value_desc.get_layer());
 396                 param_list.add("parent_layer_param",value_desc.get_param_name());
 397         }
 398
 399         {
 400                 synfigapp::SelectionManager::ChildrenList children_list;
 401                 children_list=get_selection_manager()->get_selected_children();
 402                 if(!value_desc.parent_is_canvas() && children_list.size()==1)
 403                 {
 404                         param_list.add("dest",value_desc);
 405                         param_list.add("src",children_list.front().get_value_node());
 406                 }
 407         }
 408         return param_list;
 409 }
 410
 411 Action::ParamList
 412 CanvasInterface::generate_param_list(const std::list<synfigapp::ValueDesc> &value_desc_list)
 413 {
 414         synfigapp::Action::ParamList param_list;
 415         param_list.add("time",get_time());
 416         param_list.add("canvas_interface",etl::handle<CanvasInterface>(this));
 417         param_list.add("canvas",get_canvas());
 418
 419         std::list<synfigapp::ValueDesc>::const_iterator iter;
 420         for(iter=value_desc_list.begin();iter!=value_desc_list.end();++iter)
 421         {
 422                 param_list.add("value_desc",*iter);
 423                 if(iter->is_value_node())
 424                 {
 425                         param_list.add("value_node",iter->get_value_node());
 426                 }
 427         }
 428
 429
 430         return param_list;
 431 }
 432
 433 void
 434 CanvasInterface::set_rend_desc(const synfig::RendDesc &rend_desc)
 435 {
 436         Action::Handle  action(Action::create("canvas_rend_desc_set"));
 437
 438         assert(action);
 439         if(!action)
 440                 return;
 441
 442         action->set_param("canvas",get_canvas());
 443         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 444         action->set_param("rend_desc",rend_desc);
 445
 446         if(!get_instance()->perform_action(action))
 447                 get_ui_interface()->error(_("Action Failed."));
 448 }
 449
 450 bool
 451 CanvasInterface::set_name(const synfig::String &x)
 452 {
 453         //! \todo This needs to be converted into an action
 454         get_canvas()->set_name(x);
 455         signal_id_changed_();
 456         return true;
 457 }
 458
 459 bool
 460 CanvasInterface::set_description(const synfig::String &x)
 461 {
 462         //! \todo This needs to be converted into an action
 463         get_canvas()->set_description(x);
 464         return true;
 465 }
 466
 467 bool
 468 CanvasInterface::set_id(const synfig::String &x)
 469 {
 470         //! \todo This needs to be converted into an action
 471         get_canvas()->set_id(x);
 472         signal_id_changed_();
 473         return true;
 474 }
 475
 476
 477 void
 478 CanvasInterface::jump_to_next_keyframe()
 479 {
 480         synfig::info("Current time: %s",get_time().get_string().c_str());
 481         try
 482         {
 483                 synfig::Keyframe keyframe(*get_canvas()->keyframe_list().find_next(get_time()));
 484                 synfig::info("Jumping to keyframe \"%s\" at %s",keyframe.get_description().c_str(),keyframe.get_time().get_string().c_str());
 485                 set_time(keyframe.get_time());
 486         }
 487         catch(...) { synfig::warning("Unable to find next keyframe"); }
 488 }
 489
 490 void
 491 CanvasInterface::jump_to_prev_keyframe()
 492 {
 493         synfig::info("Current time: %s",get_time().get_string().c_str());
 494         try
 495         {
 496                 synfig::Keyframe keyframe(*get_canvas()->keyframe_list().find_prev(get_time()));
 497                 synfig::info("Jumping to keyframe \"%s\" at %s",keyframe.get_description().c_str(),keyframe.get_time().get_string().c_str());
 498                 set_time(keyframe.get_time());
 499         }
 500         catch(...) { synfig::warning("Unable to find prev keyframe"); }
 501 }
 502
 503 bool
 504 CanvasInterface::import(const synfig::String &filename, bool /*copy*/)
 505 {
 506         Action::PassiveGrouper group(get_instance().get(),_("Import Image"));
 507
 508         synfig::info("Attempting to import "+filename);
 509
 510         if (filename_extension(filename) == "")
 511         {
 512                 get_ui_interface()->error(_("Filename must have an extension!"));
 513                 return false;
 514         }
 515
 516         String ext(filename_extension(filename));
 517         if (ext.size()) ext = ext.substr(1); // skip initial '.'
 518         std::transform(ext.begin(),ext.end(),ext.begin(),&::tolower);
 519
 520         // If this is a SIF file, then we need to do things slightly differently
 521         if(ext=="sif" || ext=="sifz")try
 522         {
 523
 524                 Canvas::Handle outside_canvas(synfig::open_canvas(filename));
 525                 if(!outside_canvas)
 526                         throw String(_("Unable to open this composition"));
 527
 528                 Layer::Handle layer(add_layer_to("PasteCanvas",get_canvas()));
 529                 if(!layer)
 530                         throw String(_("Unable to create \"Paste Canvas\" layer"));
 531                 if(!layer->set_param("canvas",ValueBase(outside_canvas)))
 532                         throw int();
 533
 534                 //layer->set_description(basename(filename));
 535                 signal_layer_new_description()(layer,filename);
 536                 return true;
 537         }
 538         catch(String x)
 539         {
 540                 get_ui_interface()->error(x+" -- "+filename);
 541                 return false;
 542         }
 543         catch(...)
 544         {
 545                 get_ui_interface()->error(_("Uncaught exception when attempting\nto open this composition -- ")+filename);
 546                 return false;
 547         }
 548
 549         if(!Importer::book().count(ext))
 550         {
 551                 get_ui_interface()->error(_("I don't know how to open images of this type -- ")+ext);
 552                 return false;
 553         }
 554
 555         try
 556         {
 557                 Layer::Handle layer(add_layer_to("Import",get_canvas()));
 558                 int w,h;
 559                 if(!layer)
 560                         throw int();
 561                 if(!layer->set_param("filename",ValueBase(filename)))
 562                         throw int();
 563                 w=layer->get_param("_width").get(int());
 564                 h=layer->get_param("_height").get(int());
 565                 if(w&&h)
 566                 {
 567                         Vector size=ValueBase(get_canvas()->rend_desc().get_br()-get_canvas()->rend_desc().get_tl());
 568                         Vector x;
 569                         if(size[0]<size[1])
 570                         {
 571                                 x[0]=size[0];
 572                                 x[1]=size[0]/w*h;
 573                                 if((size[0]<0) ^ (size[1]<0))
 574                                         x[1]=-x[1];
 575                         }
 576                         else
 577                         {
 578                                 x[1]=size[1];
 579                                 x[0]=size[1]/h*w;
 580                                 if((size[0]<0) ^ (size[1]<0))
 581                                         x[0]=-x[0];
 582                         }
 583                         if(!layer->set_param("tl",ValueBase(-x/2)))
 584                                 throw int();
 585                         if(!layer->set_param("br",ValueBase(x/2)))
 586                                 throw int();
 587                 }
 588                 else
 589                 {
 590                         if(!layer->set_param("tl",ValueBase(get_canvas()->rend_desc().get_tl())))
 591                                 throw int();
 592                         if(!layer->set_param("br",ValueBase(get_canvas()->rend_desc().get_br())))
 593                                 throw int();
 594                 }
 595
 596                 layer->set_description(basename(filename));
 597                 signal_layer_new_description()(layer,filename);
 598
 599                 return true;
 600         }
 601         catch(...)
 602         {
 603                 get_ui_interface()->error("Unable to import "+filename);
 604                 group.cancel();
 605                 return false;
 606         }
 607 }
 608
 609
 610 void
 611 CanvasInterface::waypoint_duplicate(synfigapp::ValueDesc value_desc,synfig::Waypoint waypoint)
 612 {
 613         Action::Handle  action(Action::create("waypoint_set_smart"));
 614
 615         assert(action);
 616         if(!action)
 617                 return;
 618
 619         waypoint.make_unique();
 620         waypoint.set_time(get_time());
 621
 622         ValueNode::Handle value_node(value_desc.get_value_node());
 623
 624         action->set_param("canvas",get_canvas());
 625         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 626         action->set_param("waypoint",waypoint);
 627         action->set_param("time",get_time());
 628         action->set_param("value_node",value_node);
 629
 630         if(!get_instance()->perform_action(action))
 631                 get_ui_interface()->error(_("Action Failed."));
 632 }
 633
 634 void
 635 CanvasInterface::waypoint_remove(synfigapp::ValueDesc value_desc,synfig::Waypoint waypoint)
 636 {
 637         Action::Handle  action(Action::create("waypoint_remove"));
 638
 639         assert(action);
 640         if(!action)
 641                 return;
 642
 643         ValueNode::Handle value_node(value_desc.get_value_node());
 644
 645         action->set_param("canvas",get_canvas());
 646         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 647         action->set_param("waypoint",waypoint);
 648         action->set_param("value_node",value_node);
 649
 650         if(!get_instance()->perform_action(action))
 651                 get_ui_interface()->error(_("Action Failed."));
 652 }
 653
 654
 655 void
 656 CanvasInterface::auto_export(synfig::ValueNode::Handle /*value_node*/)
 657 {
 658 /*
 659         // Check to see if we are already exported.
 660         if(value_node->is_exported())
 661                 return;
 662
 663         Action::Handle  action(Action::create("value_node_add"));
 664
 665         assert(action);
 666         if(!action)
 667                 return;
 668
 669         String name(strprintf(_("Unnamed%08d"),synfig::UniqueID().get_uid()));
 670
 671         action->set_param("canvas",get_canvas());
 672         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 673         action->set_param("new",value_node);
 674         action->set_param("name",name);
 675
 676         if(!get_instance()->perform_action(action))
 677                 get_ui_interface()->error(_("Action Failed."));
 678 */
 679 }
 680
 681 void
 682 CanvasInterface::auto_export(const ValueDesc& /*value_desc*/)
 683 {
 684         // THIS FUNCTION IS DEPRECATED, AND IS NOW A STUB.
 685 #if 0
 686         // Check to see if we are already exported.
 687         if(value_desc.is_exported())
 688                 return;
 689
 690         Action::Handle  action(Action::create("value_desc_export"));
 691
 692         assert(action);
 693         if(!action)
 694                 return;
 695
 696         String name(strprintf(_("Unnamed%08d"),synfig::UniqueID().get_uid()));
 697
 698         action->set_param("canvas",get_canvas());
 699         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 700         action->set_param("value_desc",value_desc);
 701         action->set_param("name",name);
 702
 703         if(!get_instance()->perform_action(action))
 704                 get_ui_interface()->error(_("Action Failed."));
 705 #endif
 706 }
 707
 708 bool
 709 CanvasInterface::change_value(synfigapp::ValueDesc value_desc,synfig::ValueBase new_value)
 710 {
 711         // If this isn't really a change, then don't bother
 712         if(new_value==value_desc.get_value(get_time()))
 713                 return true;
 714
 715         // If this change needs to take place elsewhere, then so be it.
 716         if(value_desc.get_canvas() && value_desc.get_canvas()->get_root()!=get_canvas()->get_root())do
 717         {
 718                 etl::handle<Instance> instance;
 719                 instance=find_instance(value_desc.get_canvas()->get_root());
 720
 721                 if(instance)
 722                         return instance->find_canvas_interface(value_desc.get_canvas())->change_value(value_desc,new_value);
 723                 else
 724                 {
 725                         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."));
 726                         return false;
 727                 }
 728         }while(0);
 729 #ifdef _DEBUG
 730         else
 731         { synfig::warning("Can't get canvas from value desc...?"); }
 732 #endif
 733
 734         synfigapp::Action::Handle action(synfigapp::Action::create("value_desc_set"));
 735         if(!action)
 736         {
 737                 return false;
 738         }
 739
 740         action->set_param("canvas",get_canvas());
 741         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 742         action->set_param("time",get_time());
 743         action->set_param("value_desc",value_desc);
 744         action->set_param("new_value",new_value);
 745
 746         return get_instance()->perform_action(action);
 747 }
 748
 749 void
 750 CanvasInterface::set_meta_data(const synfig::String& key,const synfig::String& data)
 751 {
 752         get_canvas()->set_meta_data(key,data);
 753 }
 754
 755
 756 // this function goes with find_important_value_descs()
 757 static int
 758 _process_value_desc(const synfigapp::ValueDesc& value_desc,std::vector<synfigapp::ValueDesc>& out, synfig::GUIDSet& guid_set)
 759 {
 760         int ret(0);
 761
 762         if(value_desc.get_value_type()==ValueBase::TYPE_CANVAS)
 763         {
 764                 Canvas::Handle canvas;
 765                 canvas=value_desc.get_value().get(canvas);
 766                 if(!canvas || !canvas->is_inline())
 767                         return ret;
 768                 ret+=CanvasInterface::find_important_value_descs(canvas,out,guid_set);
 769         }
 770
 771         if(value_desc.is_value_node())
 772         {
 773                 ValueNode::Handle value_node(value_desc.get_value_node());
 774
 775                 if(guid_set.count(value_node->get_guid()))
 776                         return ret;
 777                 guid_set.insert(value_node->get_guid());
 778
 779                 if(LinkableValueNode::Handle::cast_dynamic(value_node))
 780                 {
 781                         if(ValueNode_DynamicList::Handle::cast_dynamic(value_node))
 782                         {
 783                                 out.push_back(value_desc);
 784                                 ret++;
 785                         }
 786                         // Process the linkable ValueNode's children
 787                         LinkableValueNode::Handle value_node_copy(LinkableValueNode::Handle::cast_dynamic(value_node));
 788                         int i;
 789                         for(i=0;i<value_node_copy->link_count();i++)
 790                         {
 791                                 ValueNode::Handle link(value_node_copy->get_link(i));
 792                                 if(!link->is_exported())
 793                                         ret+=_process_value_desc(ValueDesc(value_node_copy,i),out,guid_set);
 794                         }
 795                 }
 796                 else if(ValueNode_Animated::Handle::cast_dynamic(value_node))
 797                 {
 798                         out.push_back(value_desc);
 799                         ret++;
 800                 }
 801         }
 802
 803         return ret;
 804 }
 805
 806 int
 807 CanvasInterface::find_important_value_descs(synfig::Canvas::Handle canvas,std::vector<synfigapp::ValueDesc>& out,synfig::GUIDSet& guid_set)
 808 {
 809         int ret(0);
 810         if(!canvas->is_inline())
 811         {
 812                 ValueNodeList::const_iterator iter;
 813
 814                 for(
 815                         iter=canvas->value_node_list().begin();
 816                         iter!=canvas->value_node_list().end();
 817                         ++iter)
 818                         ret+=_process_value_desc(ValueDesc(canvas,(*iter)->get_id()),out,guid_set);
 819         }
 820
 821         Canvas::const_iterator iter;
 822
 823         for(iter=canvas->begin();iter!=canvas->end();++iter)
 824         {
 825                 Layer::Handle layer(*iter);
 826
 827                 Layer::DynamicParamList::const_iterator iter;
 828                 for(
 829                         iter=layer->dynamic_param_list().begin();
 830                         iter!=layer->dynamic_param_list().end();
 831                         ++iter)
 832                 {
 833                         if(!iter->second->is_exported())
 834                                 ret+=_process_value_desc(ValueDesc(layer,iter->first),out,guid_set);
 835                 }
 836                 ValueBase value(layer->get_param("canvas"));
 837                 if(value.is_valid())
 838                         ret+=_process_value_desc(ValueDesc(layer,"canvas"),out,guid_set);
 839         }
 840
 841         return ret;
 842 }
 843
 844 int
 845 CanvasInterface::find_important_value_descs(std::vector<synfigapp::ValueDesc>& out)
 846 {
 847         synfig::GUIDSet tmp;
 848         return find_important_value_descs(get_canvas(),out,tmp);
 849 }
 850
 851 void
 852 CanvasInterface::seek_frame(int frames)
 853 {
 854         if(!frames)
 855                 return;
 856         float fps(get_canvas()->rend_desc().get_frame_rate());
 857         Time newtime(get_time()+(float)frames/fps);
 858         newtime=newtime.round(fps);
 859
 860         if(newtime<=get_canvas()->rend_desc().get_time_start())
 861                 newtime=get_canvas()->rend_desc().get_time_start();
 862         if(newtime>=get_canvas()->rend_desc().get_time_end())
 863                 newtime=get_canvas()->rend_desc().get_time_end();
 864         set_time(newtime);
 865 }
 866
 867 void
 868 CanvasInterface::seek_time(synfig::Time time)
 869 {
 870         if(!time)
 871                 return;
 872
 873         float fps(get_canvas()->rend_desc().get_frame_rate());
 874
 875         if(time>=synfig::Time::end())
 876         {
 877                 set_time(get_canvas()->rend_desc().get_time_end());
 878                 return;
 879         }
 880         if(time<=synfig::Time::begin())
 881         {
 882                 set_time(get_canvas()->rend_desc().get_time_start());
 883                 return;
 884         }
 885
 886         Time newtime(get_time()+time);
 887         newtime=newtime.round(fps);
 888
 889         if(newtime<=get_canvas()->rend_desc().get_time_start())
 890                 newtime=get_canvas()->rend_desc().get_time_start();
 891         if(newtime>=get_canvas()->rend_desc().get_time_end())
 892                 newtime=get_canvas()->rend_desc().get_time_end();
 893         set_time(newtime);
 894 }