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         if (getenv("SYNFIG_DEBUG_DESTRUCTORS"))
  95                 synfig::info("CanvasInterface::~CanvasInterface(): Deleted");
  96 }
  97
  98 void
  99 CanvasInterface::set_time(synfig::Time x)
 100 {
 101         if(get_canvas()->rend_desc().get_frame_rate())
 102         {
 103                 float fps(get_canvas()->rend_desc().get_frame_rate());
 104                 Time r(x.round(fps));
 105                 //synfig::info("CanvasInterface::set_time(): %s rounded to %s\n",x.get_string(fps).c_str(),r.get_string(fps).c_str());
 106                 x=r;
 107         }
 108         if(cur_time_.is_equal(x))
 109                 return;
 110         get_canvas()->set_time(cur_time_=x);
 111
 112         // update the time in all the child canvases
 113         Canvas::Children children = get_canvas()->get_root()->children();
 114         handle<CanvasInterface> interface;
 115         for (Canvas::Children::iterator iter = children.begin(); iter != children.end(); iter++)
 116                 if ((interface = get_instance()->find_canvas_interface(*iter)) != this)
 117                         interface->set_time(interface->get_canvas()->get_time());
 118
 119         signal_time_changed()();
 120         signal_dirty_preview()();
 121 }
 122
 123 synfig::Time
 124 CanvasInterface::get_time()const
 125 {
 126         return cur_time_;
 127 }
 128
 129 void
 130 CanvasInterface::refresh_current_values()
 131 {
 132         get_canvas()->set_time(cur_time_);
 133         signal_time_changed()();
 134         signal_dirty_preview()();
 135 }
 136
 137 etl::handle<CanvasInterface>
 138 CanvasInterface::create(etl::loose_handle<Instance> instance, etl::handle<synfig::Canvas> canvas)
 139 {
 140         etl::handle<CanvasInterface> intrfc;
 141         intrfc=new CanvasInterface(instance,canvas);
 142         instance->canvas_interface_list().push_front(intrfc);
 143         return intrfc;
 144 }
 145
 146 void
 147 CanvasInterface::set_mode(Mode x)
 148 {
 149         Action::Handle  action(Action::EditModeSet::create());
 150
 151         assert(action);
 152
 153         action->set_param("canvas",get_canvas());
 154         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 155         action->set_param("edit_mode",x);
 156
 157         if(!action->is_ready())
 158         {
 159                 get_ui_interface()->error(_("Action Not Ready, unable to change mode"));
 160                 assert(0);
 161                 return;
 162         }
 163
 164         if(!get_instance()->perform_action(action))
 165                 get_ui_interface()->error(_("Unable to change mode"));
 166
 167 //      mode_=x;
 168 //      signal_mode_changed_(x);
 169 }
 170
 171 CanvasInterface::Mode
 172 CanvasInterface::get_mode()const
 173 {
 174         return mode_;
 175 }
 176
 177
 178
 179 Layer::Handle
 180 CanvasInterface::add_layer_to(synfig::String name, synfig::Canvas::Handle canvas, int depth)
 181 {
 182         synfigapp::Action::PassiveGrouper group(get_instance().get(),_("Add Layer To"));
 183
 184         Layer::Handle   layer(Layer::create(name));
 185
 186         assert(layer);
 187
 188         if(!layer)
 189                 return 0;
 190
 191         if(canvas!=get_canvas() && !canvas->is_inline())
 192         {
 193                 synfig::error("Bad canvas passed to \"add_layer_to\"");
 194                 return 0;
 195         }
 196
 197         // automatically export the Index parameter of new Duplicate layers
 198         if (name == "duplicate")
 199                 for (int i = 1; ; i++)
 200                 {
 201                         String name = strprintf(_("Index %d"), i);
 202                         try
 203                         {
 204                                 canvas->find_value_node(name);
 205                         }
 206                         catch (Exception::IDNotFound x)
 207                         {
 208                                 add_value_node(layer->dynamic_param_list().find("index")->second, name);
 209                                 break;
 210                         }
 211                 }
 212
 213         layer->set_canvas(canvas);
 214
 215         // Apply some defaults
 216         if(layer->set_param("fg",synfigapp::Main::get_foreground_color()))
 217                 layer->set_param("bg",synfigapp::Main::get_background_color());
 218         else
 219                 layer->set_param("color",synfigapp::Main::get_foreground_color());
 220
 221         layer->set_param("width",synfigapp::Main::get_bline_width().units(get_canvas()->rend_desc()));
 222         layer->set_param("gradient",synfigapp::Main::get_gradient());
 223         if(name!="zoom")
 224                 layer->set_param("amount",synfigapp::Main::get_opacity());
 225         layer->set_param("blend_method",synfigapp::Main::get_blend_method());
 226
 227         {
 228                 // Grab the layer's list of parameters
 229                 Layer::ParamList paramlist=layer->get_param_list();
 230                 Layer::ParamList::iterator iter;
 231                 for(iter=paramlist.begin();iter!=paramlist.end();++iter)
 232                 {
 233                         ValueNode::Handle value_node;
 234
 235                         if(iter->second.get_type()==ValueBase::TYPE_LIST)
 236                                 value_node=LinkableValueNode::create("dynamic_list",iter->second);
 237                         else if(LinkableValueNode::check_type("composite",iter->second.get_type()) &&
 238                                 (iter->second.get_type()!=ValueBase::TYPE_COLOR && iter->second.get_type()!=ValueBase::TYPE_VECTOR)
 239                         )
 240                                 value_node=LinkableValueNode::create("composite",iter->second);
 241
 242                         if(value_node)
 243                                 layer->connect_dynamic_param(iter->first,value_node);
 244                 }
 245         }
 246
 247         // Action to add the layer
 248         Action::Handle  action(Action::LayerAdd::create());
 249
 250         assert(action);
 251         if(!action)
 252                 return 0;
 253
 254         action->set_param("canvas",canvas);
 255         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 256         action->set_param("new",layer);
 257
 258         if(!action->is_ready())
 259         {
 260                 get_ui_interface()->error(_("Action Not Ready"));
 261                 return 0;
 262         }
 263
 264         if(!get_instance()->perform_action(action))
 265         {
 266                 get_ui_interface()->error(_("Action Failed."));
 267                 return 0;
 268         }
 269
 270         synfig::info("DEPTH=%d",depth);
 271         // Action to move the layer (if necessary)
 272         if(depth>0)
 273         {
 274                 Action::Handle  action(Action::create("layer_move"));
 275
 276                 assert(action);
 277                 if(!action)
 278                         return 0;
 279
 280                 action->set_param("canvas",canvas);
 281                 action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 282                 action->set_param("layer",layer);
 283                 action->set_param("new_index",depth);
 284
 285                 if(!action->is_ready())
 286                 {
 287                         get_ui_interface()->error(_("Move Action Not Ready"));
 288                         return 0;
 289                 }
 290
 291                 if(!get_instance()->perform_action(action))
 292                 {
 293                         get_ui_interface()->error(_("Move Action Failed."));
 294                         return 0;
 295                 }
 296         }
 297
 298
 299         return layer;
 300 }
 301
 302
 303 bool
 304 CanvasInterface::convert(ValueDesc value_desc, synfig::String type)
 305 {
 306         Action::Handle  action(Action::ValueDescConvert::create());
 307
 308         assert(action);
 309         if(!action)
 310                 return 0;
 311
 312         action->set_param("canvas",get_canvas());
 313         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 314         action->set_param("value_desc",value_desc);
 315         action->set_param("type",type);
 316         action->set_param("time",get_time());
 317
 318         if(!action->is_ready())
 319         {
 320                 get_ui_interface()->error(_("Action Not Ready"));
 321                 return 0;
 322         }
 323
 324         if(get_instance()->perform_action(action))
 325                 return true;
 326
 327         get_ui_interface()->error(_("Action Failed."));
 328         return false;
 329 }
 330
 331 bool
 332 CanvasInterface::add_value_node(synfig::ValueNode::Handle value_node, synfig::String name)
 333 {
 334         if(name.empty())
 335         {
 336                 get_ui_interface()->error(_("Empty name!"));
 337                 return false;
 338         }
 339
 340         Action::Handle  action(Action::ValueNodeAdd::create());
 341
 342         assert(action);
 343         if(!action)
 344                 return 0;
 345
 346         action->set_param("canvas",get_canvas());
 347         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 348         action->set_param("new",value_node);
 349         action->set_param("name",name);
 350
 351         if(!action->is_ready())
 352         {
 353                 get_ui_interface()->error(_("Action Not Ready"));
 354                 return 0;
 355         }
 356
 357         if(get_instance()->perform_action(action))
 358                 return true;
 359
 360         get_ui_interface()->error(_("Action Failed."));
 361         return false;
 362 }
 363
 364 Action::ParamList
 365 CanvasInterface::generate_param_list(const ValueDesc &value_desc)
 366 {
 367         synfigapp::Action::ParamList param_list;
 368         param_list.add("time",get_time());
 369         param_list.add("canvas_interface",etl::handle<CanvasInterface>(this));
 370         param_list.add("canvas",get_canvas());
 371
 372         param_list.add("value_desc",value_desc);
 373
 374         if(value_desc.parent_is_value_node())
 375                 param_list.add("parent_value_node",value_desc.get_parent_value_node());
 376
 377         if(value_desc.is_value_node())
 378                 param_list.add("value_node",value_desc.get_value_node());
 379
 380         if(value_desc.is_const())
 381         {
 382                 // Fix 1868911: if we put a ValueBase holding a Canvas handle
 383                 // into the param_list and then export the canvas, the handle
 384                 // will miss out of having its reference count reduced,
 385                 // because by the time the handle is destructed the canvas
 386                 // will no longer be inline.  So let's not propogate that
 387                 // ValueBase any further than here.
 388                 if (value_desc.get_value_type() == ValueBase::TYPE_CANVAS)
 389                         param_list.add("value",Canvas::LooseHandle(value_desc.get_value().get(Canvas::LooseHandle())));
 390                 else
 391                         param_list.add("value",value_desc.get_value());
 392         }
 393
 394         if(value_desc.parent_is_layer_param())
 395         {
 396                 param_list.add("parent_layer",value_desc.get_layer());
 397                 param_list.add("parent_layer_param",value_desc.get_param_name());
 398         }
 399
 400         {
 401                 synfigapp::SelectionManager::ChildrenList children_list;
 402                 children_list=get_selection_manager()->get_selected_children();
 403                 if(!value_desc.parent_is_canvas() && children_list.size()==1)
 404                 {
 405                         param_list.add("dest",value_desc);
 406                         param_list.add("src",children_list.front().get_value_node());
 407                 }
 408         }
 409         return param_list;
 410 }
 411
 412 Action::ParamList
 413 CanvasInterface::generate_param_list(const std::list<synfigapp::ValueDesc> &value_desc_list)
 414 {
 415         synfigapp::Action::ParamList param_list;
 416         param_list.add("time",get_time());
 417         param_list.add("canvas_interface",etl::handle<CanvasInterface>(this));
 418         param_list.add("canvas",get_canvas());
 419
 420         std::list<synfigapp::ValueDesc>::const_iterator iter;
 421         for(iter=value_desc_list.begin();iter!=value_desc_list.end();++iter)
 422         {
 423                 param_list.add("value_desc",*iter);
 424                 if(iter->is_value_node())
 425                 {
 426                         param_list.add("value_node",iter->get_value_node());
 427                 }
 428         }
 429
 430
 431         return param_list;
 432 }
 433
 434 void
 435 CanvasInterface::set_rend_desc(const synfig::RendDesc &rend_desc)
 436 {
 437         Action::Handle  action(Action::create("canvas_rend_desc_set"));
 438
 439         assert(action);
 440         if(!action)
 441                 return;
 442
 443         action->set_param("canvas",get_canvas());
 444         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 445         action->set_param("rend_desc",rend_desc);
 446
 447         if(!get_instance()->perform_action(action))
 448                 get_ui_interface()->error(_("Action Failed."));
 449 }
 450
 451 bool
 452 CanvasInterface::set_name(const synfig::String &x)
 453 {
 454         //! \todo This needs to be converted into an action
 455         get_canvas()->set_name(x);
 456         signal_id_changed_();
 457         return true;
 458 }
 459
 460 bool
 461 CanvasInterface::set_description(const synfig::String &x)
 462 {
 463         //! \todo This needs to be converted into an action
 464         get_canvas()->set_description(x);
 465         return true;
 466 }
 467
 468 bool
 469 CanvasInterface::set_id(const synfig::String &x)
 470 {
 471         //! \todo This needs to be converted into an action
 472         get_canvas()->set_id(x);
 473         signal_id_changed_();
 474         return true;
 475 }
 476
 477
 478 void
 479 CanvasInterface::jump_to_next_keyframe()
 480 {
 481         synfig::info("Current time: %s",get_time().get_string().c_str());
 482         try
 483         {
 484                 synfig::Keyframe keyframe(*get_canvas()->keyframe_list().find_next(get_time()));
 485                 synfig::info("Jumping to keyframe \"%s\" at %s",keyframe.get_description().c_str(),keyframe.get_time().get_string().c_str());
 486                 set_time(keyframe.get_time());
 487         }
 488         catch(...) { synfig::warning("Unable to find next keyframe"); }
 489 }
 490
 491 void
 492 CanvasInterface::jump_to_prev_keyframe()
 493 {
 494         synfig::info("Current time: %s",get_time().get_string().c_str());
 495         try
 496         {
 497                 synfig::Keyframe keyframe(*get_canvas()->keyframe_list().find_prev(get_time()));
 498                 synfig::info("Jumping to keyframe \"%s\" at %s",keyframe.get_description().c_str(),keyframe.get_time().get_string().c_str());
 499                 set_time(keyframe.get_time());
 500         }
 501         catch(...) { synfig::warning("Unable to find prev keyframe"); }
 502 }
 503
 504 bool
 505 CanvasInterface::import(const synfig::String &filename, bool /*copy*/)
 506 {
 507         Action::PassiveGrouper group(get_instance().get(),_("Import Image"));
 508
 509         synfig::info("Attempting to import "+filename);
 510
 511         if (filename_extension(filename) == "")
 512         {
 513                 get_ui_interface()->error(_("Filename must have an extension!"));
 514                 return false;
 515         }
 516
 517         String ext(filename_extension(filename));
 518         if (ext.size()) ext = ext.substr(1); // skip initial '.'
 519         std::transform(ext.begin(),ext.end(),ext.begin(),&::tolower);
 520
 521         // If this is a SIF file, then we need to do things slightly differently
 522         if(ext=="sif" || ext=="sifz")try
 523         {
 524
 525                 Canvas::Handle outside_canvas(synfig::open_canvas(filename));
 526                 if(!outside_canvas)
 527                         throw String(_("Unable to open this composition"));
 528
 529                 Layer::Handle layer(add_layer_to("PasteCanvas",get_canvas()));
 530                 if(!layer)
 531                         throw String(_("Unable to create \"Paste Canvas\" layer"));
 532                 if(!layer->set_param("canvas",ValueBase(outside_canvas)))
 533                         throw int();
 534
 535                 //layer->set_description(basename(filename));
 536                 signal_layer_new_description()(layer,filename);
 537                 return true;
 538         }
 539         catch(String x)
 540         {
 541                 get_ui_interface()->error(x+" -- "+filename);
 542                 return false;
 543         }
 544         catch(...)
 545         {
 546                 get_ui_interface()->error(_("Uncaught exception when attempting\nto open this composition -- ")+filename);
 547                 return false;
 548         }
 549
 550         if(!Importer::book().count(ext))
 551         {
 552                 get_ui_interface()->error(_("I don't know how to open images of this type -- ")+ext);
 553                 return false;
 554         }
 555
 556         try
 557         {
 558                 Layer::Handle layer(add_layer_to("Import",get_canvas()));
 559                 int w,h;
 560                 if(!layer)
 561                         throw int();
 562                 if(!layer->set_param("filename",ValueBase(filename)))
 563                         throw int();
 564                 w=layer->get_param("_width").get(int());
 565                 h=layer->get_param("_height").get(int());
 566                 if(w&&h)
 567                 {
 568                         Vector size=ValueBase(get_canvas()->rend_desc().get_br()-get_canvas()->rend_desc().get_tl());
 569                         Vector x;
 570                         if(size[0]<size[1])
 571                         {
 572                                 x[0]=size[0];
 573                                 x[1]=size[0]/w*h;
 574                                 if((size[0]<0) ^ (size[1]<0))
 575                                         x[1]=-x[1];
 576                         }
 577                         else
 578                         {
 579                                 x[1]=size[1];
 580                                 x[0]=size[1]/h*w;
 581                                 if((size[0]<0) ^ (size[1]<0))
 582                                         x[0]=-x[0];
 583                         }
 584                         if(!layer->set_param("tl",ValueBase(-x/2)))
 585                                 throw int();
 586                         if(!layer->set_param("br",ValueBase(x/2)))
 587                                 throw int();
 588                 }
 589                 else
 590                 {
 591                         if(!layer->set_param("tl",ValueBase(get_canvas()->rend_desc().get_tl())))
 592                                 throw int();
 593                         if(!layer->set_param("br",ValueBase(get_canvas()->rend_desc().get_br())))
 594                                 throw int();
 595                 }
 596
 597                 layer->set_description(basename(filename));
 598                 signal_layer_new_description()(layer,filename);
 599
 600                 return true;
 601         }
 602         catch(...)
 603         {
 604                 get_ui_interface()->error("Unable to import "+filename);
 605                 group.cancel();
 606                 return false;
 607         }
 608 }
 609
 610
 611 void
 612 CanvasInterface::waypoint_duplicate(synfigapp::ValueDesc value_desc,synfig::Waypoint waypoint)
 613 {
 614         Action::Handle  action(Action::create("waypoint_set_smart"));
 615
 616         assert(action);
 617         if(!action)
 618                 return;
 619
 620         waypoint.make_unique();
 621         waypoint.set_time(get_time());
 622
 623         ValueNode::Handle value_node(value_desc.get_value_node());
 624
 625         action->set_param("canvas",get_canvas());
 626         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 627         action->set_param("waypoint",waypoint);
 628         action->set_param("time",get_time());
 629         action->set_param("value_node",value_node);
 630
 631         if(!get_instance()->perform_action(action))
 632                 get_ui_interface()->error(_("Action Failed."));
 633 }
 634
 635 void
 636 CanvasInterface::waypoint_remove(synfigapp::ValueDesc value_desc,synfig::Waypoint waypoint)
 637 {
 638         Action::Handle  action(Action::create("waypoint_remove"));
 639
 640         assert(action);
 641         if(!action)
 642                 return;
 643
 644         ValueNode::Handle value_node(value_desc.get_value_node());
 645
 646         action->set_param("canvas",get_canvas());
 647         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 648         action->set_param("waypoint",waypoint);
 649         action->set_param("value_node",value_node);
 650
 651         if(!get_instance()->perform_action(action))
 652                 get_ui_interface()->error(_("Action Failed."));
 653 }
 654
 655
 656 void
 657 CanvasInterface::auto_export(synfig::ValueNode::Handle /*value_node*/)
 658 {
 659 /*
 660         // Check to see if we are already exported.
 661         if(value_node->is_exported())
 662                 return;
 663
 664         Action::Handle  action(Action::create("value_node_add"));
 665
 666         assert(action);
 667         if(!action)
 668                 return;
 669
 670         String name(strprintf(_("Unnamed%08d"),synfig::UniqueID().get_uid()));
 671
 672         action->set_param("canvas",get_canvas());
 673         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 674         action->set_param("new",value_node);
 675         action->set_param("name",name);
 676
 677         if(!get_instance()->perform_action(action))
 678                 get_ui_interface()->error(_("Action Failed."));
 679 */
 680 }
 681
 682 void
 683 CanvasInterface::auto_export(const ValueDesc& /*value_desc*/)
 684 {
 685         // THIS FUNCTION IS DEPRECATED, AND IS NOW A STUB.
 686 #if 0
 687         // Check to see if we are already exported.
 688         if(value_desc.is_exported())
 689                 return;
 690
 691         Action::Handle  action(Action::create("value_desc_export"));
 692
 693         assert(action);
 694         if(!action)
 695                 return;
 696
 697         String name(strprintf(_("Unnamed%08d"),synfig::UniqueID().get_uid()));
 698
 699         action->set_param("canvas",get_canvas());
 700         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 701         action->set_param("value_desc",value_desc);
 702         action->set_param("name",name);
 703
 704         if(!get_instance()->perform_action(action))
 705                 get_ui_interface()->error(_("Action Failed."));
 706 #endif
 707 }
 708
 709 bool
 710 CanvasInterface::change_value(synfigapp::ValueDesc value_desc,synfig::ValueBase new_value)
 711 {
 712         // If this isn't really a change, then don't bother
 713         if(new_value==value_desc.get_value(get_time()))
 714                 return true;
 715
 716         // If this change needs to take place elsewhere, then so be it.
 717         if(value_desc.get_canvas() && value_desc.get_canvas()->get_root()!=get_canvas()->get_root())do
 718         {
 719                 etl::handle<Instance> instance;
 720                 instance=find_instance(value_desc.get_canvas()->get_root());
 721
 722                 if(instance)
 723                         return instance->find_canvas_interface(value_desc.get_canvas())->change_value(value_desc,new_value);
 724                 else
 725                 {
 726                         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."));
 727                         return false;
 728                 }
 729         }while(0);
 730 #ifdef _DEBUG
 731         else
 732         { synfig::warning("Can't get canvas from value desc...?"); }
 733 #endif
 734
 735         synfigapp::Action::Handle action(synfigapp::Action::create("value_desc_set"));
 736         if(!action)
 737         {
 738                 return false;
 739         }
 740
 741         action->set_param("canvas",get_canvas());
 742         action->set_param("canvas_interface",etl::loose_handle<CanvasInterface>(this));
 743         action->set_param("time",get_time());
 744         action->set_param("value_desc",value_desc);
 745         action->set_param("new_value",new_value);
 746
 747         return get_instance()->perform_action(action);
 748 }
 749
 750 void
 751 CanvasInterface::set_meta_data(const synfig::String& key,const synfig::String& data)
 752 {
 753         get_canvas()->set_meta_data(key,data);
 754 }
 755
 756
 757 // this function goes with find_important_value_descs()
 758 static int
 759 _process_value_desc(const synfigapp::ValueDesc& value_desc,std::vector<synfigapp::ValueDesc>& out, synfig::GUIDSet& guid_set)
 760 {
 761         int ret(0);
 762
 763         if(value_desc.get_value_type()==ValueBase::TYPE_CANVAS)
 764         {
 765                 Canvas::Handle canvas;
 766                 canvas=value_desc.get_value().get(canvas);
 767                 if(!canvas || !canvas->is_inline())
 768                         return ret;
 769                 ret+=CanvasInterface::find_important_value_descs(canvas,out,guid_set);
 770         }
 771
 772         if(value_desc.is_value_node())
 773         {
 774                 ValueNode::Handle value_node(value_desc.get_value_node());
 775
 776                 if(guid_set.count(value_node->get_guid()))
 777                         return ret;
 778                 guid_set.insert(value_node->get_guid());
 779
 780                 if(LinkableValueNode::Handle::cast_dynamic(value_node))
 781                 {
 782                         if(ValueNode_DynamicList::Handle::cast_dynamic(value_node))
 783                         {
 784                                 out.push_back(value_desc);
 785                                 ret++;
 786                         }
 787                         // Process the linkable ValueNode's children
 788                         LinkableValueNode::Handle value_node_copy(LinkableValueNode::Handle::cast_dynamic(value_node));
 789                         int i;
 790                         for(i=0;i<value_node_copy->link_count();i++)
 791                         {
 792                                 ValueNode::Handle link(value_node_copy->get_link(i));
 793                                 if(!link->is_exported())
 794                                         ret+=_process_value_desc(ValueDesc(value_node_copy,i),out,guid_set);
 795                         }
 796                 }
 797                 else if(ValueNode_Animated::Handle::cast_dynamic(value_node))
 798                 {
 799                         out.push_back(value_desc);
 800                         ret++;
 801                 }
 802         }
 803
 804         return ret;
 805 }
 806
 807 int
 808 CanvasInterface::find_important_value_descs(synfig::Canvas::Handle canvas,std::vector<synfigapp::ValueDesc>& out,synfig::GUIDSet& guid_set)
 809 {
 810         int ret(0);
 811         if(!canvas->is_inline())
 812         {
 813                 ValueNodeList::const_iterator iter;
 814
 815                 for(
 816                         iter=canvas->value_node_list().begin();
 817                         iter!=canvas->value_node_list().end();
 818                         ++iter)
 819                         ret+=_process_value_desc(ValueDesc(canvas,(*iter)->get_id()),out,guid_set);
 820         }
 821
 822         Canvas::const_iterator iter;
 823
 824         for(iter=canvas->begin();iter!=canvas->end();++iter)
 825         {
 826                 Layer::Handle layer(*iter);
 827
 828                 Layer::DynamicParamList::const_iterator iter;
 829                 for(
 830                         iter=layer->dynamic_param_list().begin();
 831                         iter!=layer->dynamic_param_list().end();
 832                         ++iter)
 833                 {
 834                         if(!iter->second->is_exported())
 835                                 ret+=_process_value_desc(ValueDesc(layer,iter->first),out,guid_set);
 836                 }
 837                 ValueBase value(layer->get_param("canvas"));
 838                 if(value.is_valid())
 839                         ret+=_process_value_desc(ValueDesc(layer,"canvas"),out,guid_set);
 840         }
 841
 842         return ret;
 843 }
 844
 845 int
 846 CanvasInterface::find_important_value_descs(std::vector<synfigapp::ValueDesc>& out)
 847 {
 848         synfig::GUIDSet tmp;
 849         return find_important_value_descs(get_canvas(),out,tmp);
 850 }
 851
 852 void
 853 CanvasInterface::seek_frame(int frames)
 854 {
 855         if(!frames)
 856                 return;
 857         float fps(get_canvas()->rend_desc().get_frame_rate());
 858         Time newtime(get_time()+(float)frames/fps);
 859         newtime=newtime.round(fps);
 860
 861         if(newtime<=get_canvas()->rend_desc().get_time_start())
 862                 newtime=get_canvas()->rend_desc().get_time_start();
 863         if(newtime>=get_canvas()->rend_desc().get_time_end())
 864                 newtime=get_canvas()->rend_desc().get_time_end();
 865         set_time(newtime);
 866 }
 867
 868 void
 869 CanvasInterface::seek_time(synfig::Time time)
 870 {
 871         if(!time)
 872                 return;
 873
 874         float fps(get_canvas()->rend_desc().get_frame_rate());
 875
 876         if(time>=synfig::Time::end())
 877         {
 878                 set_time(get_canvas()->rend_desc().get_time_end());
 879                 return;
 880         }
 881         if(time<=synfig::Time::begin())
 882         {
 883                 set_time(get_canvas()->rend_desc().get_time_start());
 884                 return;
 885         }
 886
 887         Time newtime(get_time()+time);
 888         newtime=newtime.round(fps);
 889
 890         if(newtime<=get_canvas()->rend_desc().get_time_start())
 891                 newtime=get_canvas()->rend_desc().get_time_start();
 892         if(newtime>=get_canvas()->rend_desc().get_time_end())
 893                 newtime=get_canvas()->rend_desc().get_time_end();
 894         set_time(newtime);
 895 }