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