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   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file action_system.cpp
   3 **      \brief Template File
   4 **
   5 **      $Id$
   6 **
   7 **      \legal
   8 **      Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
   9 **
  10 **      This package is free software; you can redistribute it and/or
  11 **      modify it under the terms of the GNU General Public License as
  12 **      published by the Free Software Foundation; either version 2 of
  13 **      the License, or (at your option) any later version.
  14 **
  15 **      This package is distributed in the hope that it will be useful,
  16 **      but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 **      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18 **      General Public License for more details.
  19 **      \endlegal
  20 */
  21 /* ========================================================================= */
  22
  23 /* === H E A D E R S ======================================================= */
  24
  25 #ifdef USING_PCH
  26 #       include "pch.h"
  27 #else
  28 #ifdef HAVE_CONFIG_H
  29 #       include <config.h>
  30 #endif
  31
  32 #include "action_system.h"
  33 #include "instance.h"
  34 #include "canvasinterface.h"
  35
  36 #include "general.h"
  37
  38 #endif
  39
  40 /* === U S I N G =========================================================== */
  41
  42 using namespace std;
  43 using namespace etl;
  44 using namespace synfigapp;
  45 using namespace synfig;
  46
  47 /* === M A C R O S ========================================================= */
  48
  49 /* === G L O B A L S ======================================================= */
  50
  51 /* === P R O C E D U R E S ================================================= */
  52
  53 /* === M E T H O D S ======================================================= */
  54
  55
  56
  57 Action::System::System():
  58         action_count_(0)
  59 {
  60         unset_ui_interface();
  61         clear_redo_stack_on_new_action_=false;
  62 }
  63
  64 Action::System::~System()
  65 {
  66 }
  67
  68 bool
  69 Action::System::perform_action(etl::handle<Action::Base> action)
  70 {
  71         handle<UIInterface> uim(get_ui_interface());
  72
  73         assert(action);
  74
  75         if(!action->is_ready())
  76         {
  77                 uim->error(action->get_name()+": "+_("Action is not ready."));
  78                 return false;
  79         }
  80
  81         most_recent_action_=action;
  82
  83         static bool inuse=false;
  84
  85         if(inuse) return false;
  86
  87         inuse=true;
  88         try {
  89
  90         assert(action);
  91
  92         Action::CanvasSpecific* canvas_specific(dynamic_cast<Action::CanvasSpecific*>(action.get()));
  93
  94         if(canvas_specific && canvas_specific->get_canvas())
  95         {
  96                 handle<CanvasInterface> canvas_interface=static_cast<Instance*>(this)->find_canvas_interface(canvas_specific->get_canvas());
  97                 assert(canvas_interface);
  98                 uim=canvas_interface->get_ui_interface();
  99         }
 100
 101         handle<Action::Undoable> undoable_action=handle<Action::Undoable>::cast_dynamic(action);
 102
 103         // If we cannot undo this action, make sure
 104         // that the user knows this.
 105         if(!undoable_action)
 106         {
 107                 if(uim->yes_no(
 108                         action->get_name(),
 109                         _("This action cannot be undone! Are you sure you want to continue?"),
 110                         UIInterface::RESPONSE_NO
 111                         ) == UIInterface::RESPONSE_NO
 112                 )
 113                         return false;
 114                 else
 115                 {
 116                         // Because this action cannot be undone,
 117                         // we need to clear the undo stack
 118                         clear_undo_stack();
 119                 }
 120         }
 121         else
 122                 assert(undoable_action->is_active());
 123
 124         // Perform the action
 125         try { action->perform(); }
 126         catch(Action::Error err)
 127         {
 128                 uim->task(action->get_name()+' '+_("Failed"));
 129                 inuse=false;
 130
 131                 if(err.get_type()!=Action::Error::TYPE_UNABLE)
 132                 {
 133                         if(err.get_desc().empty())
 134                                 uim->error(action->get_name()+": "+strprintf("%d",err.get_type()));
 135                         else
 136                                 uim->error(action->get_name()+": "+err.get_desc());
 137                 }
 138
 139                 // If action failed for whatever reason, just return false and do
 140                 // not add the action onto the list
 141                 return false;
 142         }
 143         catch(std::exception err)
 144         {
 145                 uim->task(action->get_name()+' '+_("Failed"));
 146                 inuse=false;
 147
 148                 uim->error(action->get_name()+": "+err.what());
 149
 150                 // If action failed for whatever reason, just return false and do
 151                 // not add the action onto the list
 152                 return false;
 153         }
 154         catch(...)
 155         {
 156                 uim->task(action->get_name()+' '+_("Failed"));
 157                 inuse=false;
 158
 159                 // If action failed for whatever reason, just return false and do
 160                 // not add the action onto the list
 161                 return false;
 162         }
 163
 164         // Clear the redo stack
 165         if(clear_redo_stack_on_new_action_)
 166                 clear_redo_stack();
 167
 168         if(!group_stack_.empty())
 169                 group_stack_.front()->inc_depth();
 170         else
 171                 inc_action_count();
 172
 173         // Push this action onto the action list if we can undo it
 174         if(undoable_action)
 175         {
 176                 // If necessary, signal the change in status of undo
 177                 if(undo_action_stack_.empty()) signal_undo_status_(true);
 178
 179                 // Add it to the list
 180                 undo_action_stack_.push_front(undoable_action);
 181
 182                 // Signal that a new action has been added
 183                 if(group_stack_.empty())
 184                         signal_new_action()(undoable_action);
 185         }
 186
 187         inuse=false;
 188
 189         uim->task(action->get_name()+' '+_("Successful"));
 190
 191         // If the action has "dirtied" the preview, signal it.
 192         if(0)if(canvas_specific && canvas_specific->is_dirty())
 193         {
 194                 Canvas::Handle canvas=canvas_specific->get_canvas();
 195                 if(!group_stack_.empty())
 196                         group_stack_.front()->request_redraw(canvas_specific->get_canvas_interface());
 197                 else
 198                 {
 199                         handle<CanvasInterface> canvas_interface=static_cast<Instance*>(this)->find_canvas_interface(canvas);
 200                         assert(canvas_interface);
 201                         //canvas_interface->signal_dirty_preview()();
 202                 }
 203         }
 204
 205         }catch(...) { inuse=false; throw; }
 206
 207         return true;
 208 }
 209
 210 bool
 211 synfigapp::Action::System::undo_(etl::handle<UIInterface> uim)
 212 {
 213         handle<Action::Undoable> action(undo_action_stack().front());
 214         most_recent_action_=action;
 215
 216         try { if(action->is_active()) action->undo(); }
 217         catch(Action::Error err)
 218         {
 219                 if(err.get_type()!=Action::Error::TYPE_UNABLE)
 220                 {
 221                         if(err.get_desc().empty())
 222                                 uim->error(action->get_name()+_(" (Undo): ")+strprintf("%d",err.get_type()));
 223                         else
 224                                 uim->error(action->get_name()+_(" (Undo): ")+err.get_desc());
 225                 }
 226
 227                 return false;
 228         }
 229         catch(std::runtime_error x)
 230         {
 231                 uim->error(x.what());
 232                 return false;
 233         }
 234         catch(...)
 235         {
 236                 return false;
 237         }
 238
 239         dec_action_count();
 240
 241         if(redo_action_stack_.empty())  signal_redo_status()(true);
 242
 243         redo_action_stack_.push_front(undo_action_stack_.front());
 244         undo_action_stack_.pop_front();
 245
 246         if(undo_action_stack_.empty())  signal_undo_status()(false);
 247
 248         if(!group_stack_.empty())
 249                 group_stack_.front()->dec_depth();
 250
 251         signal_undo_();
 252
 253         return true;
 254 }
 255
 256 bool
 257 synfigapp::Action::System::undo()
 258 {
 259         //! \todo This function is not exception safe!
 260         static bool inuse=false;
 261
 262         // If there is nothing on the action list, there is nothing to undo
 263         if(undo_action_stack().empty() || inuse)
 264                 return false;
 265
 266         handle<Action::Undoable> action=undo_action_stack().front();
 267         Action::CanvasSpecific* canvas_specific(dynamic_cast<Action::CanvasSpecific*>(action.get()));
 268
 269         handle<UIInterface> uim;
 270         if(canvas_specific && canvas_specific->get_canvas())
 271         {
 272                 Canvas::Handle canvas=canvas_specific->get_canvas();
 273                 handle<CanvasInterface> canvas_interface=static_cast<Instance*>(this)->find_canvas_interface(canvas);
 274                 assert(canvas_interface);
 275                 uim=canvas_interface->get_ui_interface();
 276         }
 277         else
 278                 uim=get_ui_interface();
 279
 280         inuse=true;
 281
 282         if(!undo_(uim))
 283         {
 284                 uim->error(undo_action_stack_.front()->get_name()+": "+_("Failed to undo."));
 285                 inuse=false;
 286                 return false;
 287         }
 288
 289         inuse=false;
 290
 291         // If the action has "dirtied" the preview, signal it.
 292         if(0)if(action->is_active() && canvas_specific && canvas_specific->is_dirty())
 293         {
 294                 Canvas::Handle canvas=canvas_specific->get_canvas();
 295                 if(!group_stack_.empty())
 296                         group_stack_.front()->request_redraw(canvas_specific->get_canvas_interface());
 297                 else
 298                 {
 299                         handle<CanvasInterface> canvas_interface=static_cast<Instance*>(this)->find_canvas_interface(canvas);
 300                         assert(canvas_interface);
 301                         //canvas_interface->signal_dirty_preview()();
 302                 }
 303         }
 304
 305         return true;
 306 }
 307
 308 bool
 309 Action::System::redo_(etl::handle<UIInterface> uim)
 310 {
 311         handle<Action::Undoable> action(redo_action_stack().front());
 312         most_recent_action_=action;
 313
 314         try { if(action->is_active()) action->perform(); }
 315         catch(Action::Error err)
 316         {
 317                 if(err.get_type()!=Action::Error::TYPE_UNABLE)
 318                 {
 319                         if(err.get_desc().empty())
 320                                 uim->error(action->get_name()+_(" (Redo): ")+strprintf("%d",err.get_type()));
 321                         else
 322                                 uim->error(action->get_name()+_(" (Redo): ")+err.get_desc());
 323                 }
 324
 325                 return false;
 326         }
 327         catch(std::runtime_error x)
 328         {
 329                 uim->error(x.what());
 330                 return false;
 331         }
 332         catch(...)
 333         {
 334                 return false;
 335         }
 336
 337         inc_action_count();
 338
 339         if(undo_action_stack_.empty())  signal_undo_status()(true);
 340
 341         undo_action_stack_.push_front(redo_action_stack_.front());
 342         redo_action_stack_.pop_front();
 343
 344         if(redo_action_stack_.empty())  signal_redo_status()(false);
 345
 346         if(!group_stack_.empty())
 347                 group_stack_.front()->inc_depth();
 348
 349         signal_redo_();
 350
 351         return true;
 352 }
 353
 354 bool
 355 Action::System::redo()
 356 {
 357         //! \todo This function is not exception safe!
 358         static bool inuse=false;
 359
 360         // If there is nothing on the action list, there is nothing to undo
 361         if(redo_action_stack_.empty() || inuse)
 362                 return false;
 363
 364         inuse=true;
 365
 366         handle<Action::Undoable> action=redo_action_stack().front();
 367         Action::CanvasSpecific* canvas_specific(dynamic_cast<Action::CanvasSpecific*>(action.get()));
 368
 369         handle<UIInterface> uim;
 370         if(canvas_specific && canvas_specific->get_canvas())
 371         {
 372                 Canvas::Handle canvas=canvas_specific->get_canvas();
 373                 handle<CanvasInterface> canvas_interface=static_cast<Instance*>(this)->find_canvas_interface(canvas);
 374                 assert(canvas_interface);
 375                 uim=canvas_interface->get_ui_interface();
 376         }
 377         else
 378                 uim=get_ui_interface();
 379
 380         if(!redo_(uim))
 381         {
 382                 uim->error(redo_action_stack_.front()->get_name()+": "+_("Failed to redo."));
 383                 inuse=false;
 384                 return false;
 385         }
 386
 387         inuse=false;
 388
 389         // If the action has "dirtied" the preview, signal it.
 390         if(0)if(action->is_active() && canvas_specific && canvas_specific->is_dirty())
 391         {
 392                 Canvas::Handle canvas=canvas_specific->get_canvas();
 393                 if(!group_stack_.empty())
 394                         group_stack_.front()->request_redraw(canvas_specific->get_canvas_interface());
 395                 else
 396                 {
 397                         handle<CanvasInterface> canvas_interface=static_cast<Instance*>(this)->find_canvas_interface(canvas);
 398                         assert(canvas_interface);
 399                         //canvas_interface->signal_dirty_preview()();
 400                 }
 401         }
 402
 403         return true;
 404 }
 405
 406 void
 407 Action::System::inc_action_count()const
 408 {
 409         action_count_++;
 410         if(action_count_==1)
 411                 signal_unsaved_status_changed_(true);
 412         if(!action_count_)
 413                 signal_unsaved_status_changed_(false);
 414 }
 415
 416 void
 417 Action::System::dec_action_count()const
 418 {
 419         action_count_--;
 420         if(action_count_==-1)
 421                 signal_unsaved_status_changed_(true);
 422         if(!action_count_)
 423                 signal_unsaved_status_changed_(false);
 424 }
 425
 426 void
 427 Action::System::reset_action_count()const
 428 {
 429         if(!action_count_)
 430                 return;
 431
 432         action_count_=0;
 433         signal_unsaved_status_changed_(false);
 434 }
 435
 436 void
 437 Action::System::clear_undo_stack()
 438 {
 439         if(undo_action_stack_.empty()) return;
 440         undo_action_stack_.clear();
 441         signal_undo_status_(false);
 442         signal_undo_stack_cleared_();
 443 }
 444
 445 void
 446 Action::System::clear_redo_stack()
 447 {
 448         if(redo_action_stack_.empty()) return;
 449         redo_action_stack_.clear();
 450         signal_redo_status_(false);
 451         signal_redo_stack_cleared_();
 452 }
 453
 454 bool
 455 Action::System::set_action_status(etl::handle<Action::Undoable> action, bool x)
 456 {
 457         Stack::iterator iter;
 458         int failed=false;
 459
 460         if(action->is_active()==x)
 461                 return true;
 462
 463         handle<Action::Undoable> cur_pos=undo_action_stack_.front();
 464
 465         Action::CanvasSpecific* canvas_specific(dynamic_cast<Action::CanvasSpecific*>(action.get()));
 466
 467         handle<UIInterface> uim=new ConfidentUIInterface();
 468
 469         iter=find(undo_action_stack_.begin(),undo_action_stack_.end(),action);
 470         if(iter!=undo_action_stack_.end())
 471         {
 472                 while(undo_action_stack_.front()!=action)
 473                 {
 474                         if(!undo_(uim))
 475                         {
 476                                 return false;
 477                         }
 478                 }
 479                 if(!undo_(uim))
 480                 {
 481                         return false;
 482                 }
 483
 484                 action->set_active(x);
 485
 486                 if(redo_(get_ui_interface()))
 487                 {
 488                         signal_action_status_changed_(action);
 489                 }
 490                 else
 491                 {
 492                         action->set_active(!x);
 493                         failed=true;
 494                 }
 495
 496
 497                 while(undo_action_stack_.front()!=cur_pos)
 498                 {
 499                         if(!redo_(uim))
 500                         {
 501                                 redo_action_stack_.front()->set_active(false);
 502                                 signal_action_status_changed_(redo_action_stack_.front());
 503                         }
 504                 }
 505
 506                 if(!failed && canvas_specific && canvas_specific->is_dirty())
 507                 {
 508                         Canvas::Handle canvas=canvas_specific->get_canvas();
 509                         handle<CanvasInterface> canvas_interface=static_cast<Instance*>(this)->find_canvas_interface(canvas);
 510                         assert(canvas_interface);
 511                         //canvas_interface->signal_dirty_preview()();
 512                 }
 513
 514                 return true;
 515         }
 516
 517         iter=find(redo_action_stack_.begin(),redo_action_stack_.end(),action);
 518         if(iter!=redo_action_stack_.end())
 519         {
 520                 action->set_active(x);
 521                 signal_action_status_changed_(action);
 522
 523
 524
 525
 526                 if(canvas_specific && canvas_specific->is_dirty())
 527                 {
 528                         Canvas::Handle canvas=canvas_specific->get_canvas();
 529                         handle<CanvasInterface> canvas_interface=static_cast<Instance*>(this)->find_canvas_interface(canvas);
 530                         assert(canvas_interface);
 531                         //canvas_interface->signal_dirty_preview()();
 532                 }
 533
 534                 return true;
 535         }
 536
 537         return false;
 538 }
 539
 540 Action::PassiveGrouper::PassiveGrouper(etl::loose_handle<System> instance_,synfig::String name_):
 541         instance_(instance_),
 542         name_(name_),
 543         redraw_requested_(false),
 544         depth_(0)
 545 {
 546         // Add this group onto the group stack
 547         instance_->group_stack_.push_front(this);
 548 }
 549
 550 void
 551 Action::PassiveGrouper::request_redraw(etl::handle<CanvasInterface> x)
 552 {
 553 /*      if(instance_->group_stack_.empty())
 554         {
 555                 if(x!=canvas_interface_)
 556                 {
 557                         x->signal_dirty_preview()();
 558                 }
 559
 560                 redraw_requested_=false;
 561         }
 562         else
 563         {
 564                 if(instance_->group_stack_.back()==this)
 565                 {
 566                         redraw_requested_=true;
 567                 }
 568                 else
 569                 {
 570                         instance_->group_stack_.back()->request_redraw(x);
 571                         redraw_requested_=false;
 572                 }
 573         }
 574 */
 575         if(x)
 576         {
 577                 redraw_requested_=true;
 578                 canvas_interface_=x;
 579         }
 580 }
 581
 582 Action::PassiveGrouper::~PassiveGrouper()
 583 {
 584         assert(instance_->group_stack_.front()==this);
 585
 586         // Remove this group from the group stack
 587         instance_->group_stack_.pop_front();
 588
 589         handle<Action::Group> group;
 590
 591         if(depth_==1)
 592         {
 593                 handle<Action::Undoable> action(instance_->undo_action_stack_.front());
 594
 595                 group=handle<Action::Group>::cast_dynamic(action);
 596
 597                 if(group)
 598                 {
 599                         // If the only action inside of us is a group,
 600                         // then we should rename the group to our name.
 601                         group->set_name(name_);
 602                 }
 603                 else
 604                 {
 605                         Action::CanvasSpecific* canvas_specific(dynamic_cast<Action::CanvasSpecific*>(action.get()));
 606
 607                         if(0)if(canvas_specific && canvas_specific->is_dirty() && canvas_specific->get_canvas_interface())
 608                         {
 609                                 if(instance_->group_stack_.empty())
 610                                         request_redraw(canvas_specific->get_canvas_interface());
 611                         }
 612                 }
 613
 614                 if(instance_->group_stack_.empty())
 615                 {
 616                         instance_->inc_action_count();
 617                         instance_->signal_new_action()(instance_->undo_action_stack_.front());
 618                 }
 619                 else
 620                         instance_->group_stack_.front()->inc_depth();
 621
 622         }
 623         else
 624         if(depth_>0)
 625         {
 626                 group=new Action::Group(name_);
 627
 628                 for(int i=0;i<depth_;i++)
 629         //      for(;depth_;depth_--)
 630                 {
 631                         handle<Action::Undoable> action(instance_->undo_action_stack_.front());
 632                         Action::CanvasSpecific* canvas_specific(dynamic_cast<Action::CanvasSpecific*>(action.get()));
 633
 634                         if(0)if(canvas_specific && canvas_specific->is_dirty())
 635                         {
 636                                 group->set_dirty(true);
 637                                 group->set_canvas(canvas_specific->get_canvas());
 638                                 group->set_canvas_interface(canvas_specific->get_canvas_interface());
 639                         }
 640
 641                         // Copy the action from the undo stack to the group
 642                         group->add_action_front(action);
 643
 644                         // Remove the action from the undo stack
 645                         instance_->undo_action_stack_.pop_front();
 646                 }
 647
 648                 // Push the group onto the stack
 649                 instance_->undo_action_stack_.push_front(group);
 650
 651                 if(0)if(group->is_dirty())
 652                         request_redraw(group->get_canvas_interface());
 653                 //      group->get_canvas_interface()->signal_dirty_preview()();
 654
 655                 if(instance_->group_stack_.empty())
 656                 {
 657                         instance_->inc_action_count();
 658                         instance_->signal_new_action()(instance_->undo_action_stack_.front());
 659                 }
 660                 else
 661                         instance_->group_stack_.front()->inc_depth();
 662         }
 663
 664         if(0)if(redraw_requested_)
 665         {
 666                 if(instance_->group_stack_.empty())
 667                 {
 668                         assert(canvas_interface_);
 669                         canvas_interface_->signal_dirty_preview()();
 670                 }
 671                 else
 672                 {
 673                         instance_->group_stack_.front()->request_redraw(canvas_interface_);
 674                         redraw_requested_=false;
 675                 }
 676         }
 677 }
 678
 679 void
 680 Action::PassiveGrouper::cancel()
 681 {
 682         bool error=false;
 683
 684         // Cancel any groupers that may be on top of us first
 685         //while(instance_->group_stack_.front()!=this)
 686         //      instance_->group_stack_.front()->cancel();
 687
 688         synfig::warning("Cancel depth: %d",depth_);
 689
 690         while(depth_)
 691                 if(!instance_->undo())
 692                 {
 693                         error=true;
 694                         break;
 695                 }
 696
 697         if(error)
 698                 instance_->get_ui_interface()->error(_("State restore failure"));
 699         else
 700                 redraw_requested_=false;
 701 }