src/wx/timeline.cc

   1 /*
   2     Copyright (C) 2013-2018 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   6     DCP-o-matic is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     DCP-o-matic is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21 #include "film_editor.h"
  22 #include "timeline.h"
  23 #include "timeline_time_axis_view.h"
  24 #include "timeline_reels_view.h"
  25 #include "timeline_labels_view.h"
  26 #include "timeline_video_content_view.h"
  27 #include "timeline_audio_content_view.h"
  28 #include "timeline_subtitle_content_view.h"
  29 #include "timeline_atmos_content_view.h"
  30 #include "content_panel.h"
  31 #include "wx_util.h"
  32 #include "lib/film.h"
  33 #include "lib/playlist.h"
  34 #include "lib/image_content.h"
  35 #include "lib/timer.h"
  36 #include "lib/audio_content.h"
  37 #include "lib/subtitle_content.h"
  38 #include "lib/video_content.h"
  39 #include "lib/atmos_mxf_content.h"
  40 #include <wx/graphics.h>
  41 #include <boost/weak_ptr.hpp>
  42 #include <boost/foreach.hpp>
  43 #include <list>
  44 #include <iostream>
  45
  46 using std::list;
  47 using std::cout;
  48 using std::min;
  49 using std::max;
  50 using boost::shared_ptr;
  51 using boost::weak_ptr;
  52 using boost::dynamic_pointer_cast;
  53 using boost::bind;
  54 using boost::optional;
  55
  56 Timeline::Timeline (wxWindow* parent, ContentPanel* cp, shared_ptr<Film> film)
  57         : wxPanel (parent, wxID_ANY)
  58         , _labels_panel (new wxPanel (this, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE))
  59         , _main_canvas (new wxScrolledCanvas (this, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE))
  60         , _content_panel (cp)
  61         , _film (film)
  62         , _time_axis_view (new TimelineTimeAxisView (*this, 64))
  63         , _reels_view (new TimelineReelsView (*this, 32))
  64         , _labels_view (new TimelineLabelsView (*this))
  65         , _tracks (0)
  66         , _left_down (false)
  67         , _down_view_position (0)
  68         , _first_move (false)
  69         , _menu (this)
  70         , _snap (true)
  71         , _tool (SELECT)
  72         , _x_scroll_rate (16)
  73         , _y_scroll_rate (16)
  74 {
  75 #ifndef __WXOSX__
  76         _labels_panel->SetDoubleBuffered (true);
  77         _main_canvas->SetDoubleBuffered (true);
  78 #endif
  79
  80         wxSizer* sizer = new wxBoxSizer (wxHORIZONTAL);
  81         sizer->Add (_labels_panel, 0, wxEXPAND);
  82         _labels_panel->SetMinSize (wxSize (_labels_view->bbox().width, -1));
  83         sizer->Add (_main_canvas, 1, wxEXPAND);
  84         SetSizer (sizer);
  85
  86         _labels_panel->Bind (wxEVT_PAINT,      boost::bind (&Timeline::paint_labels, this));
  87         _main_canvas->Bind  (wxEVT_PAINT,      boost::bind (&Timeline::paint_main,   this));
  88         _main_canvas->Bind  (wxEVT_LEFT_DOWN,  boost::bind (&Timeline::left_down,    this, _1));
  89         _main_canvas->Bind  (wxEVT_LEFT_UP,    boost::bind (&Timeline::left_up,      this, _1));
  90         _main_canvas->Bind  (wxEVT_RIGHT_DOWN, boost::bind (&Timeline::right_down,   this, _1));
  91         _main_canvas->Bind  (wxEVT_MOTION,     boost::bind (&Timeline::mouse_moved,  this, _1));
  92         _main_canvas->Bind  (wxEVT_SIZE,       boost::bind (&Timeline::resized,      this));
  93
  94         film_changed (Film::CONTENT);
  95
  96         SetMinSize (wxSize (640, 4 * track_height() + 96));
  97
  98         _film_changed_connection = film->Changed.connect (bind (&Timeline::film_changed, this, _1));
  99         _film_content_changed_connection = film->ContentChanged.connect (bind (&Timeline::film_content_changed, this, _2, _3));
 100
 101         _pixels_per_second = max (0.01, static_cast<double>(640) / film->length().seconds ());
 102
 103         setup_scrollbars ();
 104         _main_canvas->EnableScrolling (true, true);
 105 }
 106
 107 void
 108 Timeline::paint_labels ()
 109 {
 110         wxPaintDC dc (_labels_panel);
 111
 112         wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
 113         if (!gc) {
 114                 return;
 115         }
 116
 117         _labels_view->paint (gc, list<dcpomatic::Rect<int> >());
 118
 119         delete gc;
 120 }
 121
 122 void
 123 Timeline::paint_main ()
 124 {
 125         wxPaintDC dc (_main_canvas);
 126         _main_canvas->DoPrepareDC (dc);
 127
 128         wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
 129         if (!gc) {
 130                 return;
 131         }
 132
 133         int vsx, vsy;
 134         _main_canvas->GetViewStart (&vsx, &vsy);
 135         gc->Translate (-vsx * _x_scroll_rate, -vsy * _y_scroll_rate);
 136
 137         gc->SetAntialiasMode (wxANTIALIAS_DEFAULT);
 138
 139         BOOST_FOREACH (shared_ptr<TimelineView> i, _views) {
 140
 141                 shared_ptr<TimelineContentView> ic = dynamic_pointer_cast<TimelineContentView> (i);
 142
 143                 /* Find areas of overlap with other content views, so that we can plot them */
 144                 list<dcpomatic::Rect<int> > overlaps;
 145                 BOOST_FOREACH (shared_ptr<TimelineView> j, _views) {
 146                         shared_ptr<TimelineContentView> jc = dynamic_pointer_cast<TimelineContentView> (j);
 147                         /* No overlap with non-content views, views no different tracks, audio views or non-active views */
 148                         if (!ic || !jc || i == j || ic->track() != jc->track() || ic->track().get_value_or(2) >= 2 || !ic->active() || !jc->active()) {
 149                                 continue;
 150                         }
 151
 152                         optional<dcpomatic::Rect<int> > r = j->bbox().intersection (i->bbox());
 153                         if (r) {
 154                                 overlaps.push_back (r.get ());
 155                         }
 156                 }
 157
 158                 i->paint (gc, overlaps);
 159         }
 160
 161         if (_zoom_point) {
 162                 /* Translate back as _down_point and _zoom_point do not take scroll into account */
 163                 gc->Translate (vsx * _x_scroll_rate, vsy * _y_scroll_rate);
 164                 gc->SetPen (*wxBLACK_PEN);
 165                 gc->SetBrush (*wxTRANSPARENT_BRUSH);
 166                 gc->DrawRectangle (
 167                         min (_down_point.x, _zoom_point->x),
 168                         min (_down_point.y, _zoom_point->y),
 169                         fabs (_down_point.x - _zoom_point->x),
 170                         fabs (_down_point.y - _zoom_point->y)
 171                         );
 172         }
 173
 174         delete gc;
 175 }
 176
 177 void
 178 Timeline::film_changed (Film::Property p)
 179 {
 180         if (p == Film::CONTENT || p == Film::REEL_TYPE || p == Film::REEL_LENGTH) {
 181                 ensure_ui_thread ();
 182                 recreate_views ();
 183         } else if (p == Film::CONTENT_ORDER) {
 184                 Refresh ();
 185         }
 186 }
 187
 188 void
 189 Timeline::recreate_views ()
 190 {
 191         shared_ptr<const Film> film = _film.lock ();
 192         if (!film) {
 193                 return;
 194         }
 195
 196         _views.clear ();
 197         _views.push_back (_time_axis_view);
 198         _views.push_back (_reels_view);
 199
 200         BOOST_FOREACH (shared_ptr<Content> i, film->content ()) {
 201                 if (i->video) {
 202                         _views.push_back (shared_ptr<TimelineView> (new TimelineVideoContentView (*this, i)));
 203                 }
 204
 205                 if (i->audio && !i->audio->mapping().mapped_output_channels().empty ()) {
 206                         _views.push_back (shared_ptr<TimelineView> (new TimelineAudioContentView (*this, i)));
 207                 }
 208
 209                 if (i->subtitle) {
 210                         _views.push_back (shared_ptr<TimelineView> (new TimelineSubtitleContentView (*this, i)));
 211                 }
 212
 213                 if (dynamic_pointer_cast<AtmosMXFContent> (i)) {
 214                         _views.push_back (shared_ptr<TimelineView> (new TimelineAtmosContentView (*this, i)));
 215                 }
 216         }
 217
 218         assign_tracks ();
 219         setup_scrollbars ();
 220         Refresh ();
 221 }
 222
 223 void
 224 Timeline::film_content_changed (int property, bool frequent)
 225 {
 226         ensure_ui_thread ();
 227
 228         if (property == AudioContentProperty::STREAMS) {
 229                 recreate_views ();
 230         } else if (!frequent) {
 231                 setup_scrollbars ();
 232                 Refresh ();
 233         }
 234 }
 235
 236 template <class T>
 237 int
 238 place (TimelineViewList& views, int& tracks)
 239 {
 240         int const base = tracks;
 241
 242         BOOST_FOREACH (shared_ptr<TimelineView> i, views) {
 243                 if (!dynamic_pointer_cast<T>(i)) {
 244                         continue;
 245                 }
 246
 247                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (i);
 248
 249                 int t = base;
 250
 251                 shared_ptr<Content> content = cv->content();
 252                 DCPTimePeriod const content_period (content->position(), content->end());
 253
 254                 while (true) {
 255                         TimelineViewList::iterator j = views.begin();
 256                         while (j != views.end()) {
 257                                 shared_ptr<T> test = dynamic_pointer_cast<T> (*j);
 258                                 if (!test) {
 259                                         ++j;
 260                                         continue;
 261                                 }
 262
 263                                 shared_ptr<Content> test_content = test->content();
 264                                 if (
 265                                         test->track() && test->track().get() == t &&
 266                                         content_period.overlap(DCPTimePeriod(test_content->position(), test_content->end()))) {
 267                                         /* we have an overlap on track `t' */
 268                                         ++t;
 269                                         break;
 270                                 }
 271
 272                                 ++j;
 273                         }
 274
 275                         if (j == views.end ()) {
 276                                 /* no overlap on `t' */
 277                                 break;
 278                         }
 279                 }
 280
 281                 cv->set_track (t);
 282                 tracks = max (tracks, t + 1);
 283         }
 284
 285         return tracks - base;
 286 }
 287
 288 void
 289 Timeline::assign_tracks ()
 290 {
 291         /* Tracks are:
 292            Video (mono or left-eye)
 293            Video (right-eye)
 294            Subtitle 1
 295            Subtitle 2
 296            Subtitle N
 297            Atmos
 298            Audio 1
 299            Audio 2
 300            Audio N
 301         */
 302
 303         _tracks = 0;
 304
 305         for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 306                 shared_ptr<TimelineContentView> c = dynamic_pointer_cast<TimelineContentView> (*i);
 307                 if (c) {
 308                         c->unset_track ();
 309                 }
 310         }
 311
 312         /* Video */
 313
 314         bool have_3d = false;
 315         BOOST_FOREACH (shared_ptr<TimelineView> i, _views) {
 316                 shared_ptr<TimelineVideoContentView> cv = dynamic_pointer_cast<TimelineVideoContentView> (i);
 317                 if (!cv) {
 318                         continue;
 319                 }
 320
 321                 /* Video on tracks 0 and maybe 1 (left and right eye) */
 322                 if (cv->content()->video->frame_type() == VIDEO_FRAME_TYPE_3D_RIGHT) {
 323                         cv->set_track (1);
 324                         _tracks = max (_tracks, 2);
 325                         have_3d = true;
 326                 } else {
 327                         cv->set_track (0);
 328                 }
 329         }
 330
 331         _tracks = max (_tracks, 1);
 332
 333         /* Subtitle */
 334
 335         int const subtitle_tracks = place<TimelineSubtitleContentView> (_views, _tracks);
 336
 337         /* Atmos */
 338
 339         bool have_atmos = false;
 340         BOOST_FOREACH (shared_ptr<TimelineView> i, _views) {
 341                 shared_ptr<TimelineVideoContentView> cv = dynamic_pointer_cast<TimelineVideoContentView> (i);
 342                 if (!cv) {
 343                         continue;
 344                 }
 345                 if (dynamic_pointer_cast<TimelineAtmosContentView> (i)) {
 346                         cv->set_track (_tracks - 1);
 347                         have_atmos = true;
 348                 }
 349         }
 350
 351         if (have_atmos) {
 352                 ++_tracks;
 353         }
 354
 355         /* Audio */
 356
 357         place<TimelineAudioContentView> (_views, _tracks);
 358
 359         _labels_view->set_3d (have_3d);
 360         _labels_view->set_subtitle_tracks (subtitle_tracks);
 361         _labels_view->set_atmos (have_atmos);
 362
 363         _time_axis_view->set_y (tracks() * track_height() + 64);
 364         _reels_view->set_y (8);
 365 }
 366
 367 int
 368 Timeline::tracks () const
 369 {
 370         return _tracks;
 371 }
 372
 373 void
 374 Timeline::setup_scrollbars ()
 375 {
 376         shared_ptr<const Film> film = _film.lock ();
 377         if (!film || !_pixels_per_second) {
 378                 return;
 379         }
 380         _main_canvas->SetVirtualSize (*_pixels_per_second * film->length().seconds(), tracks() * track_height() + 96);
 381         _main_canvas->SetScrollRate (_x_scroll_rate, _y_scroll_rate);
 382 }
 383
 384 shared_ptr<TimelineView>
 385 Timeline::event_to_view (wxMouseEvent& ev)
 386 {
 387         /* Search backwards through views so that we find the uppermost one first */
 388         TimelineViewList::reverse_iterator i = _views.rbegin();
 389         Position<int> const p (ev.GetX(), ev.GetY());
 390         while (i != _views.rend() && !(*i)->bbox().contains (p)) {
 391                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 392                 ++i;
 393         }
 394
 395         if (i == _views.rend ()) {
 396                 return shared_ptr<TimelineView> ();
 397         }
 398
 399         return *i;
 400 }
 401
 402 void
 403 Timeline::left_down (wxMouseEvent& ev)
 404 {
 405         _left_down = true;
 406         _down_point = ev.GetPosition ();
 407
 408         switch (_tool) {
 409         case SELECT:
 410                 left_down_select (ev);
 411                 break;
 412         case ZOOM:
 413                 /* Nothing to do */
 414                 break;
 415         }
 416 }
 417
 418 void
 419 Timeline::left_down_select (wxMouseEvent& ev)
 420 {
 421         shared_ptr<TimelineView> view = event_to_view (ev);
 422         shared_ptr<TimelineContentView> content_view = dynamic_pointer_cast<TimelineContentView> (view);
 423
 424         _down_view.reset ();
 425
 426         if (content_view) {
 427                 _down_view = content_view;
 428                 _down_view_position = content_view->content()->position ();
 429         }
 430
 431         for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 432                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 433                 if (!cv) {
 434                         continue;
 435                 }
 436
 437                 if (!ev.ShiftDown ()) {
 438                         cv->set_selected (view == *i);
 439                 }
 440         }
 441
 442         if (content_view && ev.ShiftDown ()) {
 443                 content_view->set_selected (!content_view->selected ());
 444         }
 445
 446         _first_move = false;
 447
 448         if (_down_view) {
 449                 /* Pre-compute the points that we might snap to */
 450                 for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 451                         shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 452                         if (!cv || cv == _down_view || cv->content() == _down_view->content()) {
 453                                 continue;
 454                         }
 455
 456                         _start_snaps.push_back (cv->content()->position());
 457                         _end_snaps.push_back (cv->content()->position());
 458                         _start_snaps.push_back (cv->content()->end());
 459                         _end_snaps.push_back (cv->content()->end());
 460
 461                         BOOST_FOREACH (DCPTime i, cv->content()->reel_split_points()) {
 462                                 _start_snaps.push_back (i);
 463                         }
 464                 }
 465
 466                 /* Tell everyone that things might change frequently during the drag */
 467                 _down_view->content()->set_change_signals_frequent (true);
 468         }
 469 }
 470
 471 void
 472 Timeline::left_up (wxMouseEvent& ev)
 473 {
 474         _left_down = false;
 475
 476         switch (_tool) {
 477         case SELECT:
 478                 left_up_select (ev);
 479                 break;
 480         case ZOOM:
 481                 left_up_zoom (ev);
 482                 break;
 483         }
 484 }
 485
 486 void
 487 Timeline::left_up_select (wxMouseEvent& ev)
 488 {
 489         if (_down_view) {
 490                 _down_view->content()->set_change_signals_frequent (false);
 491         }
 492
 493         _content_panel->set_selection (selected_content ());
 494         set_position_from_event (ev);
 495
 496         /* Clear up up the stuff we don't do during drag */
 497         assign_tracks ();
 498         setup_scrollbars ();
 499         Refresh ();
 500
 501         _start_snaps.clear ();
 502         _end_snaps.clear ();
 503 }
 504
 505 void
 506 Timeline::left_up_zoom (wxMouseEvent& ev)
 507 {
 508         _zoom_point = ev.GetPosition ();
 509
 510         int vsx, vsy;
 511         _main_canvas->GetViewStart (&vsx, &vsy);
 512
 513         wxPoint top_left(min(_down_point.x, _zoom_point->x), min(_down_point.y, _zoom_point->y));
 514         wxPoint bottom_right(max(_down_point.x, _zoom_point->x), max(_down_point.y, _zoom_point->y));
 515
 516         DCPTime time_left = DCPTime::from_seconds((top_left.x + vsx) / *_pixels_per_second);
 517         DCPTime time_right = DCPTime::from_seconds((bottom_right.x + vsx) / *_pixels_per_second);
 518         _pixels_per_second = GetSize().GetWidth() / (time_right.seconds() - time_left.seconds());
 519         setup_scrollbars ();
 520         _main_canvas->Scroll (time_left.seconds() * *_pixels_per_second / _x_scroll_rate, wxDefaultCoord);
 521
 522         _zoom_point = optional<wxPoint> ();
 523         Refresh ();
 524 }
 525
 526 void
 527 Timeline::mouse_moved (wxMouseEvent& ev)
 528 {
 529         switch (_tool) {
 530         case SELECT:
 531                 mouse_moved_select (ev);
 532                 break;
 533         case ZOOM:
 534                 mouse_moved_zoom (ev);
 535                 break;
 536         }
 537 }
 538
 539 void
 540 Timeline::mouse_moved_select (wxMouseEvent& ev)
 541 {
 542         if (!_left_down) {
 543                 return;
 544         }
 545
 546         set_position_from_event (ev);
 547 }
 548
 549 void
 550 Timeline::mouse_moved_zoom (wxMouseEvent& ev)
 551 {
 552         if (!_left_down) {
 553                 return;
 554         }
 555
 556         _zoom_point = ev.GetPosition ();
 557         Refresh ();
 558 }
 559
 560 void
 561 Timeline::right_down (wxMouseEvent& ev)
 562 {
 563         switch (_tool) {
 564         case SELECT:
 565                 right_down_select (ev);
 566                 break;
 567         case ZOOM:
 568                 /* Zoom out */
 569                 _pixels_per_second = *_pixels_per_second / 2;
 570                 setup_scrollbars ();
 571                 break;
 572         }
 573 }
 574
 575 void
 576 Timeline::right_down_select (wxMouseEvent& ev)
 577 {
 578         shared_ptr<TimelineView> view = event_to_view (ev);
 579         shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (view);
 580         if (!cv) {
 581                 return;
 582         }
 583
 584         if (!cv->selected ()) {
 585                 clear_selection ();
 586                 cv->set_selected (true);
 587         }
 588
 589         _menu.popup (_film, selected_content (), selected_views (), ev.GetPosition ());
 590 }
 591
 592 void
 593 Timeline::maybe_snap (DCPTime a, DCPTime b, optional<DCPTime>& nearest_distance) const
 594 {
 595         DCPTime const d = a - b;
 596         if (!nearest_distance || d.abs() < nearest_distance.get().abs()) {
 597                 nearest_distance = d;
 598         }
 599 }
 600
 601 void
 602 Timeline::set_position_from_event (wxMouseEvent& ev)
 603 {
 604         if (!_pixels_per_second) {
 605                 return;
 606         }
 607
 608         double const pps = _pixels_per_second.get ();
 609
 610         wxPoint const p = ev.GetPosition();
 611
 612         if (!_first_move) {
 613                 /* We haven't moved yet; in that case, we must move the mouse some reasonable distance
 614                    before the drag is considered to have started.
 615                 */
 616                 int const dist = sqrt (pow (p.x - _down_point.x, 2) + pow (p.y - _down_point.y, 2));
 617                 if (dist < 8) {
 618                         return;
 619                 }
 620                 _first_move = true;
 621         }
 622
 623         if (!_down_view) {
 624                 return;
 625         }
 626
 627         DCPTime new_position = _down_view_position + DCPTime::from_seconds ((p.x - _down_point.x) / pps);
 628
 629         if (_snap) {
 630
 631                 DCPTime const new_end = new_position + _down_view->content()->length_after_trim();
 632                 /* Signed `distance' to nearest thing (i.e. negative is left on the timeline,
 633                    positive is right).
 634                 */
 635                 optional<DCPTime> nearest_distance;
 636
 637                 /* Find the nearest snap point */
 638
 639                 BOOST_FOREACH (DCPTime i, _start_snaps) {
 640                         maybe_snap (i, new_position, nearest_distance);
 641                 }
 642
 643                 BOOST_FOREACH (DCPTime i, _end_snaps) {
 644                         maybe_snap (i, new_end, nearest_distance);
 645                 }
 646
 647                 if (nearest_distance) {
 648                         /* Snap if it's close; `close' means within a proportion of the time on the timeline */
 649                         if (nearest_distance.get().abs() < DCPTime::from_seconds ((width() / pps) / 64)) {
 650                                 new_position += nearest_distance.get ();
 651                         }
 652                 }
 653         }
 654
 655         if (new_position < DCPTime ()) {
 656                 new_position = DCPTime ();
 657         }
 658
 659         _down_view->content()->set_position (new_position);
 660
 661         shared_ptr<Film> film = _film.lock ();
 662         DCPOMATIC_ASSERT (film);
 663         film->set_sequence (false);
 664 }
 665
 666 void
 667 Timeline::force_redraw (dcpomatic::Rect<int> const & r)
 668 {
 669         RefreshRect (wxRect (r.x, r.y, r.width, r.height), false);
 670 }
 671
 672 shared_ptr<const Film>
 673 Timeline::film () const
 674 {
 675         return _film.lock ();
 676 }
 677
 678 void
 679 Timeline::resized ()
 680 {
 681         setup_scrollbars ();
 682 }
 683
 684 void
 685 Timeline::clear_selection ()
 686 {
 687         for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 688                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 689                 if (cv) {
 690                         cv->set_selected (false);
 691                 }
 692         }
 693 }
 694
 695 TimelineContentViewList
 696 Timeline::selected_views () const
 697 {
 698         TimelineContentViewList sel;
 699
 700         for (TimelineViewList::const_iterator i = _views.begin(); i != _views.end(); ++i) {
 701                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 702                 if (cv && cv->selected()) {
 703                         sel.push_back (cv);
 704                 }
 705         }
 706
 707         return sel;
 708 }
 709
 710 ContentList
 711 Timeline::selected_content () const
 712 {
 713         ContentList sel;
 714         TimelineContentViewList views = selected_views ();
 715
 716         for (TimelineContentViewList::const_iterator i = views.begin(); i != views.end(); ++i) {
 717                 sel.push_back ((*i)->content ());
 718         }
 719
 720         return sel;
 721 }
 722
 723 void
 724 Timeline::set_selection (ContentList selection)
 725 {
 726         for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 727                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 728                 if (cv) {
 729                         cv->set_selected (find (selection.begin(), selection.end(), cv->content ()) != selection.end ());
 730                 }
 731         }
 732 }