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

   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         //// debug actions
  72         // synfig::info("%s:%d perform_action: '%s'", __FILE__, __LINE__, action->get_name().c_str());
  73
  74         handle<UIInterface> uim(get_ui_interface());
  75
  76         assert(action);
  77
  78         if(!action->is_ready())
  79         {
  80                 uim->error(action->get_local_name()+": "+_("Action is not ready."));
  81                 return false;
  82         }
  83
  84         most_recent_action_=action;
  85
  86         static bool inuse=false;
  87
  88         if(inuse) return false;
  89
  90         inuse=true;
  91         try {
  92
  93         assert(action);
  94
  95         Action::CanvasSpecific* canvas_specific(dynamic_cast<Action::CanvasSpecific*>(action.get()));
  96
  97         if(canvas_specific && canvas_specific->get_canvas())
  98         {
  99                 handle<CanvasInterface> canvas_interface=static_cast<Instance*>(this)->find_canvas_interface(canvas_specific->get_canvas());
 100                 assert(canvas_interface);
 101                 uim=canvas_interface->get_ui_interface();
 102         }
 103
 104         handle<Action::Undoable> undoable_action=handle<Action::Undoable>::cast_dynamic(action);
 105
 106         // If we cannot undo this action, make sure
 107         // that the user knows this.
 108         if(!undoable_action)
 109         {
 110                 if(uim->yes_no(
 111                         action->get_local_name(),
 112                         _("This action cannot be undone! Are you sure you want to continue?"),
 113                         UIInterface::RESPONSE_NO
 114                         ) == UIInterface::RESPONSE_NO
 115                 )
 116                         return false;
 117                 else
 118                 {
 119                         // Because this action cannot be undone,
 120                         // we need to clear the undo stack
 121                         clear_undo_stack();
 122                 }
 123         }
 124         else
 125                 assert(undoable_action->is_active());
 126
 127         // Perform the action
 128         try { action->perform(); }
 129         catch(Action::Error err)
 130         {
 131                 uim->task(action->get_local_name()+' '+_("Failed"));
 132                 inuse=false;
 133
 134                 if(err.get_type()!=Action::Error::TYPE_UNABLE)
 135                 {
 136                         if(err.get_desc().empty())
 137                                 uim->error(action->get_local_name()+": "+strprintf("%d",err.get_type()));
 138                         else
 139                                 uim->error(action->get_local_name()+": "+err.get_desc());
 140                 }
 141
 142                 // If action failed for whatever reason, just return false and do
 143                 // not add the action onto the list
 144                 return false;
 145         }
 146         catch(std::exception err)
 147         {
 148                 uim->task(action->get_local_name()+' '+_("Failed"));
 149                 inuse=false;
 150
 151                 uim->error(action->get_local_name()+": "+err.what());
 152
 153                 // If action failed for whatever reason, just return false and do
 154                 // not add the action onto the list
 155                 return false;
 156         }
 157         catch(...)
 158         {
 159                 uim->task(action->get_local_name()+' '+_("Failed"));
 160                 inuse=false;
 161
 162                 // If action failed for whatever reason, just return false and do
 163                 // not add the action onto the list
 164                 return false;
 165         }
 166
 167         // Clear the redo stack
 168         if(clear_redo_stack_on_new_action_)
 169                 clear_redo_stack();
 170
 171         if(!group_stack_.empty())
 172                 group_stack_.front()->inc_depth();
 173         else
 174                 inc_action_count();
 175
 176         // Push this action onto the action list if we can undo it
 177         if(undoable_action)
 178         {
 179                 // If necessary, signal the change in status of undo
 180                 if(undo_action_stack_.empty()) signal_undo_status_(true);
 181
 182                 // Add it to the list
 183                 undo_action_stack_.push_front(undoable_action);
 184
 185                 // Signal that a new action has been added
 186                 if(group_stack_.empty())
 187                         signal_new_action()(undoable_action);
 188         }
 189
 190         inuse=false;
 191
 192         uim->task(action->get_local_name()+' '+_("Successful"));
 193
 194         // If the action has "dirtied" the preview, signal it.
 195         if(0)if(canvas_specific && canvas_specific->is_dirty())
 196         {
 197                 Canvas::Handle canvas=canvas_specific->get_canvas();
 198                 if(!group_stack_.empty())
 199                         group_stack_.front()->request_redraw(canvas_specific->get_canvas_interface());
 200                 else
 201                 {
 202                         handle<CanvasInterface> canvas_interface=static_cast<Instance*>(this)->find_canvas_interface(canvas);
 203                         assert(canvas_interface);
 204                         //canvas_interface->signal_dirty_preview()();
 205                 }
 206         }
 207
 208         }catch(...) { inuse=false; throw; }
 209
 210         return true;
 211 }
 212
 213 bool
 214 synfigapp::Action::System::undo_(etl::handle<UIInterface> uim)
 215 {
 216         handle<Action::Undoable> action(undo_action_stack().front());
 217         most_recent_action_=action;
 218
 219         try { if(action->is_active()) action->undo(); }
 220         catch(Action::Error err)
 221         {
 222                 if(err.get_type()!=Action::Error::TYPE_UNABLE)
 223                 {
 224                         if(err.get_desc().empty())
 225                                 uim->error(action->get_local_name()+_(" (Undo): ")+strprintf("%d",err.get_type()));
 226                         else
 227                                 uim->error(action->get_local_name()+_(" (Undo): ")+err.get_desc());
 228                 }
 229
 230                 return false;
 231         }
 232         catch(std::runtime_error x)
 233         {
 234                 uim->error(x.what());
 235                 return false;
 236         }
 237         catch(...)
 238         {
 239                 return false;
 240         }
 241
 242         dec_action_count();
 243
 244         if(redo_action_stack_.empty())  signal_redo_status()(true);
 245
 246         redo_action_stack_.push_front(undo_action_stack_.front());
 247         undo_action_stack_.pop_front();
 248
 249         if(undo_action_stack_.empty())  signal_undo_status()(false);
 250
 251         if(!group_stack_.empty())
 252                 group_stack_.front()->dec_depth();
 253
 254         signal_undo_();
 255
 256         return true;
 257 }
 258
 259 bool
 260 synfigapp::Action::System::undo()
 261 {
 262         //! \todo This function is not exception safe!
 263         static bool inuse=false;
 264
 265         // If there is nothing on the action list, there is nothing to undo
 266         if(undo_action_stack().empty() || inuse)
 267                 return false;
 268
 269         handle<Action::Undoable> action=undo_action_stack().front();
 270         Action::CanvasSpecific* canvas_specific(dynamic_cast<Action::CanvasSpecific*>(action.get()));
 271
 272         handle<UIInterface> uim;
 273         if(canvas_specific && canvas_specific->get_canvas())
 274         {
 275                 Canvas::Handle canvas=canvas_specific->get_canvas();
 276                 handle<CanvasInterface> canvas_interface=static_cast<Instance*>(this)->find_canvas_interface(canvas);
 277                 assert(canvas_interface);
 278                 uim=canvas_interface->get_ui_interface();
 279         }
 280         else
 281                 uim=get_ui_interface();
 282
 283         inuse=true;
 284
 285         if(!undo_(uim))
 286         {
 287                 uim->error(undo_action_stack_.front()->get_local_name()+": "+_("Failed to undo."));
 288                 inuse=false;
 289                 return false;
 290         }
 291
 292         inuse=false;
 293
 294         // If the action has "dirtied" the preview, signal it.
 295         if(0)if(action->is_active() && canvas_specific && canvas_specific->is_dirty())
 296         {
 297                 Canvas::Handle canvas=canvas_specific->get_canvas();
 298                 if(!group_stack_.empty())
 299                         group_stack_.front()->request_redraw(canvas_specific->get_canvas_interface());
 300                 else
 301                 {
 302                         handle<CanvasInterface> canvas_interface=static_cast<Instance*>(this)->find_canvas_interface(canvas);
 303                         assert(canvas_interface);
 304                         //canvas_interface->signal_dirty_preview()();
 305                 }
 306         }
 307
 308         return true;
 309 }
 310
 311 bool
 312 Action::System::redo_(etl::handle<UIInterface> uim)
 313 {
 314         handle<Action::Undoable> action(redo_action_stack().front());
 315         most_recent_action_=action;
 316
 317         try { if(action->is_active()) action->perform(); }
 318         catch(Action::Error err)
 319         {
 320                 if(err.get_type()!=Action::Error::TYPE_UNABLE)
 321                 {
 322                         if(err.get_desc().empty())
 323                                 uim->error(action->get_local_name()+_(" (Redo): ")+strprintf("%d",err.get_type()));
 324                         else
 325                                 uim->error(action->get_local_name()+_(" (Redo): ")+err.get_desc());
 326                 }
 327
 328                 return false;
 329         }
 330         catch(std::runtime_error x)
 331         {
 332                 uim->error(x.what());
 333                 return false;
 334         }
 335         catch(...)
 336         {
 337                 return false;
 338         }
 339
 340         inc_action_count();
 341
 342         if(undo_action_stack_.empty())  signal_undo_status()(true);
 343
 344         undo_action_stack_.push_front(redo_action_stack_.front());
 345         redo_action_stack_.pop_front();
 346
 347         if(redo_action_stack_.empty())  signal_redo_status()(false);
 348
 349         if(!group_stack_.empty())
 350                 group_stack_.front()->inc_depth();
 351
 352         signal_redo_();
 353
 354         return true;
 355 }
 356
 357 bool
 358 Action::System::redo()
 359 {
 360         //! \todo This function is not exception safe!
 361         static bool inuse=false;
 362
 363         // If there is nothing on the action list, there is nothing to undo
 364         if(redo_action_stack_.empty() || inuse)
 365                 return false;
 366
 367         inuse=true;
 368
 369         handle<Action::Undoable> action=redo_action_stack().front();
 370         Action::CanvasSpecific* canvas_specific(dynamic_cast<Action::CanvasSpecific*>(action.get()));
 371
 372         handle<UIInterface> uim;
 373         if(canvas_specific && canvas_specific->get_canvas())
 374         {
 375                 Canvas::Handle canvas=canvas_specific->get_canvas();
 376                 handle<CanvasInterface> canvas_interface=static_cast<Instance*>(this)->find_canvas_interface(canvas);
 377                 assert(canvas_interface);
 378                 uim=canvas_interface->get_ui_interface();
 379         }
 380         else
 381                 uim=get_ui_interface();
 382
 383         if(!redo_(uim))
 384         {
 385                 uim->error(redo_action_stack_.front()->get_local_name()+": "+_("Failed to redo."));
 386                 inuse=false;
 387                 return false;
 388         }
 389
 390         inuse=false;
 391
 392         // If the action has "dirtied" the preview, signal it.
 393         if(0)if(action->is_active() && canvas_specific && canvas_specific->is_dirty())
 394         {
 395                 Canvas::Handle canvas=canvas_specific->get_canvas();
 396                 if(!group_stack_.empty())
 397                         group_stack_.front()->request_redraw(canvas_specific->get_canvas_interface());
 398                 else
 399                 {
 400                         handle<CanvasInterface> canvas_interface=static_cast<Instance*>(this)->find_canvas_interface(canvas);
 401                         assert(canvas_interface);
 402                         //canvas_interface->signal_dirty_preview()();
 403                 }
 404         }
 405
 406         return true;
 407 }
 408
 409 void
 410 Action::System::inc_action_count()const
 411 {
 412         action_count_++;
 413         if(action_count_==1)
 414                 signal_unsaved_status_changed_(true);
 415         if(!action_count_)
 416                 signal_unsaved_status_changed_(false);
 417 }
 418
 419 void
 420 Action::System::dec_action_count()const
 421 {
 422         action_count_--;
 423         if(action_count_==-1)
 424                 signal_unsaved_status_changed_(true);
 425         if(!action_count_)
 426                 signal_unsaved_status_changed_(false);
 427 }
 428
 429 void
 430 Action::System::reset_action_count()const
 431 {
 432         if(!action_count_)
 433                 return;
 434
 435         action_count_=0;
 436         signal_unsaved_status_changed_(false);
 437 }
 438
 439 void
 440 Action::System::clear_undo_stack()
 441 {
 442         if(undo_action_stack_.empty()) return;
 443         undo_action_stack_.clear();
 444         signal_undo_status_(false);
 445         signal_undo_stack_cleared_();
 446 }
 447
 448 void
 449 Action::System::clear_redo_stack()
 450 {
 451         if(redo_action_stack_.empty()) return;
 452         redo_action_stack_.clear();
 453         signal_redo_status_(false);
 454         signal_redo_stack_cleared_();
 455 }
 456
 457 bool
 458 Action::System::set_action_status(etl::handle<Action::Undoable> action, bool x)
 459 {
 460         Stack::iterator iter;
 461         int failed=false;
 462
 463         if(action->is_active()==x)
 464                 return true;
 465
 466         handle<Action::Undoable> cur_pos=undo_action_stack_.front();
 467
 468         Action::CanvasSpecific* canvas_specific(dynamic_cast<Action::CanvasSpecific*>(action.get()));
 469
 470         handle<UIInterface> uim=new ConfidentUIInterface();
 471
 472         iter=find(undo_action_stack_.begin(),undo_action_stack_.end(),action);
 473         if(iter!=undo_action_stack_.end())
 474         {
 475                 while(undo_action_stack_.front()!=action)
 476                 {
 477                         if(!undo_(uim))
 478                         {
 479                                 return false;
 480                         }
 481                 }
 482                 if(!undo_(uim))
 483                 {
 484                         return false;
 485                 }
 486
 487                 action->set_active(x);
 488
 489                 if(redo_(get_ui_interface()))
 490                 {
 491                         signal_action_status_changed_(action);
 492                 }
 493                 else
 494                 {
 495                         action->set_active(!x);
 496                         failed=true;
 497                 }
 498
 499
 500                 while(undo_action_stack_.front()!=cur_pos)
 501                 {
 502                         if(!redo_(uim))
 503                         {
 504                                 redo_action_stack_.front()->set_active(false);
 505                                 signal_action_status_changed_(redo_action_stack_.front());
 506                         }
 507                 }
 508
 509                 if(!failed && canvas_specific && canvas_specific->is_dirty())
 510                 {
 511                         Canvas::Handle canvas=canvas_specific->get_canvas();
 512                         handle<CanvasInterface> canvas_interface=static_cast<Instance*>(this)->find_canvas_interface(canvas);
 513                         assert(canvas_interface);
 514                         //canvas_interface->signal_dirty_preview()();
 515                 }
 516
 517                 return true;
 518         }
 519
 520         iter=find(redo_action_stack_.begin(),redo_action_stack_.end(),action);
 521         if(iter!=redo_action_stack_.end())
 522         {
 523                 action->set_active(x);
 524                 signal_action_status_changed_(action);
 525
 526
 527
 528
 529                 if(canvas_specific && canvas_specific->is_dirty())
 530                 {
 531                         Canvas::Handle canvas=canvas_specific->get_canvas();
 532                         handle<CanvasInterface> canvas_interface=static_cast<Instance*>(this)->find_canvas_interface(canvas);
 533                         assert(canvas_interface);
 534                         //canvas_interface->signal_dirty_preview()();
 535                 }
 536
 537                 return true;
 538         }
 539
 540         return false;
 541 }
 542
 543 Action::PassiveGrouper::PassiveGrouper(etl::loose_handle<System> instance_,synfig::String name_):
 544         instance_(instance_),
 545         name_(name_),
 546         redraw_requested_(false),
 547         depth_(0)
 548 {
 549         // Add this group onto the group stack
 550         instance_->group_stack_.push_front(this);
 551 }
 552
 553 void
 554 Action::PassiveGrouper::request_redraw(etl::handle<CanvasInterface> x)
 555 {
 556 /*      if(instance_->group_stack_.empty())
 557         {
 558                 if(x!=canvas_interface_)
 559                 {
 560                         x->signal_dirty_preview()();
 561                 }
 562
 563                 redraw_requested_=false;
 564         }
 565         else
 566         {
 567                 if(instance_->group_stack_.back()==this)
 568                 {
 569                         redraw_requested_=true;
 570                 }
 571                 else
 572                 {
 573                         instance_->group_stack_.back()->request_redraw(x);
 574                         redraw_requested_=false;
 575                 }
 576         }
 577 */
 578         if(x)
 579         {
 580                 redraw_requested_=true;
 581                 canvas_interface_=x;
 582         }
 583 }
 584
 585 Action::PassiveGrouper::~PassiveGrouper()
 586 {
 587         assert(instance_->group_stack_.front()==this);
 588
 589         // Remove this group from the group stack
 590         instance_->group_stack_.pop_front();
 591
 592         handle<Action::Group> group;
 593
 594         if(depth_==1)
 595         {
 596                 handle<Action::Undoable> action(instance_->undo_action_stack_.front());
 597
 598                 group=handle<Action::Group>::cast_dynamic(action);
 599
 600                 if(group)
 601                 {
 602                         // If the only action inside of us is a group,
 603                         // then we should rename the group to our name.
 604                         group->set_name(name_);
 605                 }
 606                 else
 607                 {
 608                         Action::CanvasSpecific* canvas_specific(dynamic_cast<Action::CanvasSpecific*>(action.get()));
 609
 610                         if(0)if(canvas_specific && canvas_specific->is_dirty() && canvas_specific->get_canvas_interface())
 611                         {
 612                                 if(instance_->group_stack_.empty())
 613                                         request_redraw(canvas_specific->get_canvas_interface());
 614                         }
 615                 }
 616
 617                 if(instance_->group_stack_.empty())
 618                 {
 619                         instance_->inc_action_count();
 620                         instance_->signal_new_action()(instance_->undo_action_stack_.front());
 621                 }
 622                 else
 623                         instance_->group_stack_.front()->inc_depth();
 624
 625         }
 626         else
 627         if(depth_>0)
 628         {
 629                 group=new Action::Group(name_);
 630
 631                 for(int i=0;i<depth_;i++)
 632         //      for(;depth_;depth_--)
 633                 {
 634                         handle<Action::Undoable> action(instance_->undo_action_stack_.front());
 635                         Action::CanvasSpecific* canvas_specific(dynamic_cast<Action::CanvasSpecific*>(action.get()));
 636
 637                         if(0)if(canvas_specific && canvas_specific->is_dirty())
 638                         {
 639                                 group->set_dirty(true);
 640                                 group->set_canvas(canvas_specific->get_canvas());
 641                                 group->set_canvas_interface(canvas_specific->get_canvas_interface());
 642                         }
 643
 644                         // Copy the action from the undo stack to the group
 645                         group->add_action_front(action);
 646
 647                         // Remove the action from the undo stack
 648                         instance_->undo_action_stack_.pop_front();
 649                 }
 650
 651                 // Push the group onto the stack
 652                 instance_->undo_action_stack_.push_front(group);
 653
 654                 if(0)if(group->is_dirty())
 655                         request_redraw(group->get_canvas_interface());
 656                 //      group->get_canvas_interface()->signal_dirty_preview()();
 657
 658                 if(instance_->group_stack_.empty())
 659                 {
 660                         instance_->inc_action_count();
 661                         instance_->signal_new_action()(instance_->undo_action_stack_.front());
 662                 }
 663                 else
 664                         instance_->group_stack_.front()->inc_depth();
 665         }
 666
 667         if(0)if(redraw_requested_)
 668         {
 669                 if(instance_->group_stack_.empty())
 670                 {
 671                         assert(canvas_interface_);
 672                         canvas_interface_->signal_dirty_preview()();
 673                 }
 674                 else
 675                 {
 676                         instance_->group_stack_.front()->request_redraw(canvas_interface_);
 677                         redraw_requested_=false;
 678                 }
 679         }
 680 }
 681
 682 void
 683 Action::PassiveGrouper::cancel()
 684 {
 685         bool error=false;
 686
 687         // Cancel any groupers that may be on top of us first
 688         //while(instance_->group_stack_.front()!=this)
 689         //      instance_->group_stack_.front()->cancel();
 690
 691         synfig::warning("Cancel depth: %d",depth_);
 692
 693         while(depth_)
 694                 if(!instance_->undo())
 695                 {
 696                         error=true;
 697                         break;
 698                 }
 699
 700         if(error)
 701                 instance_->get_ui_interface()->error(_("State restore failure"));
 702         else
 703                 redraw_requested_=false;
 704 }