src/wx/timeline.cc

   1 /*
   2     Copyright (C) 2013-2014 Carl Hetherington <cth@carlh.net>
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include <list>
  21 #include <wx/graphics.h>
  22 #include <boost/weak_ptr.hpp>
  23 #include "lib/film.h"
  24 #include "lib/playlist.h"
  25 #include "lib/image_content.h"
  26 #include "film_editor.h"
  27 #include "timeline.h"
  28 #include "wx_util.h"
  29
  30 using std::list;
  31 using std::cout;
  32 using std::max;
  33 using boost::shared_ptr;
  34 using boost::weak_ptr;
  35 using boost::dynamic_pointer_cast;
  36 using boost::bind;
  37 using boost::optional;
  38
  39 /** @class View
  40  *  @brief Parent class for components of the timeline (e.g. a piece of content or an axis).
  41  */
  42 class View : public boost::noncopyable
  43 {
  44 public:
  45         View (Timeline& t)
  46                 : _timeline (t)
  47         {
  48
  49         }
  50
  51         virtual ~View () {}
  52
  53         void paint (wxGraphicsContext* g)
  54         {
  55                 _last_paint_bbox = bbox ();
  56                 do_paint (g);
  57         }
  58
  59         void force_redraw ()
  60         {
  61                 _timeline.force_redraw (_last_paint_bbox);
  62                 _timeline.force_redraw (bbox ());
  63         }
  64
  65         virtual dcpomatic::Rect<int> bbox () const = 0;
  66
  67 protected:
  68         virtual void do_paint (wxGraphicsContext *) = 0;
  69
  70         int time_x (DCPTime t) const
  71         {
  72                 return _timeline.tracks_position().x + t.seconds() * _timeline.pixels_per_second().get_value_or (0);
  73         }
  74
  75         Timeline& _timeline;
  76
  77 private:
  78         dcpomatic::Rect<int> _last_paint_bbox;
  79 };
  80
  81
  82 /** @class ContentView
  83  *  @brief Parent class for views of pieces of content.
  84  */
  85 class ContentView : public View
  86 {
  87 public:
  88         ContentView (Timeline& tl, shared_ptr<Content> c)
  89                 : View (tl)
  90                 , _content (c)
  91                 , _selected (false)
  92         {
  93                 _content_connection = c->Changed.connect (bind (&ContentView::content_changed, this, _2, _3));
  94         }
  95
  96         dcpomatic::Rect<int> bbox () const
  97         {
  98                 assert (_track);
  99
 100                 shared_ptr<const Film> film = _timeline.film ();
 101                 shared_ptr<const Content> content = _content.lock ();
 102                 if (!film || !content) {
 103                         return dcpomatic::Rect<int> ();
 104                 }
 105
 106                 return dcpomatic::Rect<int> (
 107                         time_x (content->position ()) - 8,
 108                         y_pos (_track.get()) - 8,
 109                         content->length_after_trim().seconds() * _timeline.pixels_per_second().get_value_or(0) + 16,
 110                         _timeline.track_height() + 16
 111                         );
 112         }
 113
 114         void set_selected (bool s) {
 115                 _selected = s;
 116                 force_redraw ();
 117         }
 118
 119         bool selected () const {
 120                 return _selected;
 121         }
 122
 123         shared_ptr<Content> content () const {
 124                 return _content.lock ();
 125         }
 126
 127         void set_track (int t) {
 128                 _track = t;
 129         }
 130
 131         void unset_track () {
 132                 _track = boost::optional<int> ();
 133         }
 134
 135         optional<int> track () const {
 136                 return _track;
 137         }
 138
 139         virtual wxString type () const = 0;
 140         virtual wxColour colour () const = 0;
 141
 142 private:
 143
 144         void do_paint (wxGraphicsContext* gc)
 145         {
 146                 assert (_track);
 147
 148                 shared_ptr<const Film> film = _timeline.film ();
 149                 shared_ptr<const Content> cont = content ();
 150                 if (!film || !cont) {
 151                         return;
 152                 }
 153
 154                 DCPTime const position = cont->position ();
 155                 DCPTime const len = cont->length_after_trim ();
 156
 157                 wxColour selected (colour().Red() / 2, colour().Green() / 2, colour().Blue() / 2);
 158
 159                 gc->SetPen (*wxBLACK_PEN);
 160
 161                 gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (0, 0, 0), 4, wxPENSTYLE_SOLID));
 162                 if (_selected) {
 163                         gc->SetBrush (*wxTheBrushList->FindOrCreateBrush (selected, wxBRUSHSTYLE_SOLID));
 164                 } else {
 165                         gc->SetBrush (*wxTheBrushList->FindOrCreateBrush (colour(), wxBRUSHSTYLE_SOLID));
 166                 }
 167
 168                 wxGraphicsPath path = gc->CreatePath ();
 169                 path.MoveToPoint    (time_x (position),       y_pos (_track.get()) + 4);
 170                 path.AddLineToPoint (time_x (position + len), y_pos (_track.get()) + 4);
 171                 path.AddLineToPoint (time_x (position + len), y_pos (_track.get() + 1) - 4);
 172                 path.AddLineToPoint (time_x (position),       y_pos (_track.get() + 1) - 4);
 173                 path.AddLineToPoint (time_x (position),       y_pos (_track.get()) + 4);
 174                 gc->StrokePath (path);
 175                 gc->FillPath (path);
 176
 177                 wxString name = wxString::Format (wxT ("%s [%s]"), std_to_wx (cont->summary()).data(), type().data());
 178                 wxDouble name_width;
 179                 wxDouble name_height;
 180                 wxDouble name_descent;
 181                 wxDouble name_leading;
 182                 gc->GetTextExtent (name, &name_width, &name_height, &name_descent, &name_leading);
 183
 184                 gc->Clip (wxRegion (time_x (position), y_pos (_track.get()), len.seconds() * _timeline.pixels_per_second().get_value_or(0), _timeline.track_height()));
 185                 gc->DrawText (name, time_x (position) + 12, y_pos (_track.get() + 1) - name_height - 4);
 186                 gc->ResetClip ();
 187         }
 188
 189         int y_pos (int t) const
 190         {
 191                 return _timeline.tracks_position().y + t * _timeline.track_height();
 192         }
 193
 194         void content_changed (int p, bool frequent)
 195         {
 196                 ensure_ui_thread ();
 197
 198                 if (p == ContentProperty::POSITION || p == ContentProperty::LENGTH) {
 199                         force_redraw ();
 200                 }
 201
 202                 if (!frequent) {
 203                         _timeline.setup_pixels_per_second ();
 204                         _timeline.Refresh ();
 205                 }
 206         }
 207
 208         boost::weak_ptr<Content> _content;
 209         optional<int> _track;
 210         bool _selected;
 211
 212         boost::signals2::scoped_connection _content_connection;
 213 };
 214
 215 class AudioContentView : public ContentView
 216 {
 217 public:
 218         AudioContentView (Timeline& tl, shared_ptr<Content> c)
 219                 : ContentView (tl, c)
 220         {}
 221
 222 private:
 223         wxString type () const
 224         {
 225                 return _("audio");
 226         }
 227
 228         wxColour colour () const
 229         {
 230                 return wxColour (149, 121, 232, 255);
 231         }
 232 };
 233
 234 class VideoContentView : public ContentView
 235 {
 236 public:
 237         VideoContentView (Timeline& tl, shared_ptr<Content> c)
 238                 : ContentView (tl, c)
 239         {}
 240
 241 private:
 242
 243         wxString type () const
 244         {
 245                 if (dynamic_pointer_cast<ImageContent> (content ()) && content()->number_of_paths() == 1) {
 246                         return _("still");
 247                 } else {
 248                         return _("video");
 249                 }
 250         }
 251
 252         wxColour colour () const
 253         {
 254                 return wxColour (242, 92, 120, 255);
 255         }
 256 };
 257
 258 class SubtitleContentView : public ContentView
 259 {
 260 public:
 261         SubtitleContentView (Timeline& tl, shared_ptr<Content> c)
 262                 : ContentView (tl, c)
 263         {}
 264
 265 private:
 266         wxString type () const
 267         {
 268                 return _("subtitles");
 269         }
 270
 271         wxColour colour () const
 272         {
 273                 return wxColour (163, 255, 154, 255);
 274         }
 275 };
 276
 277 class TimeAxisView : public View
 278 {
 279 public:
 280         TimeAxisView (Timeline& tl, int y)
 281                 : View (tl)
 282                 , _y (y)
 283         {}
 284
 285         dcpomatic::Rect<int> bbox () const
 286         {
 287                 return dcpomatic::Rect<int> (0, _y - 4, _timeline.width(), 24);
 288         }
 289
 290         void set_y (int y)
 291         {
 292                 _y = y;
 293                 force_redraw ();
 294         }
 295
 296 private:
 297
 298         void do_paint (wxGraphicsContext* gc)
 299         {
 300                 if (!_timeline.pixels_per_second()) {
 301                         return;
 302                 }
 303
 304                 double const pps = _timeline.pixels_per_second().get ();
 305
 306                 gc->SetPen (*wxThePenList->FindOrCreatePen (wxColour (0, 0, 0), 1, wxPENSTYLE_SOLID));
 307
 308                 double mark_interval = rint (128 / pps);
 309                 if (mark_interval > 5) {
 310                         mark_interval -= int (rint (mark_interval)) % 5;
 311                 }
 312                 if (mark_interval > 10) {
 313                         mark_interval -= int (rint (mark_interval)) % 10;
 314                 }
 315                 if (mark_interval > 60) {
 316                         mark_interval -= int (rint (mark_interval)) % 60;
 317                 }
 318                 if (mark_interval > 3600) {
 319                         mark_interval -= int (rint (mark_interval)) % 3600;
 320                 }
 321
 322                 if (mark_interval < 1) {
 323                         mark_interval = 1;
 324                 }
 325
 326                 wxGraphicsPath path = gc->CreatePath ();
 327                 path.MoveToPoint (_timeline.x_offset(), _y);
 328                 path.AddLineToPoint (_timeline.width(), _y);
 329                 gc->StrokePath (path);
 330
 331                 /* Time in seconds */
 332                 DCPTime t;
 333                 while ((t.seconds() * pps) < _timeline.width()) {
 334                         wxGraphicsPath path = gc->CreatePath ();
 335                         path.MoveToPoint (time_x (t), _y - 4);
 336                         path.AddLineToPoint (time_x (t), _y + 4);
 337                         gc->StrokePath (path);
 338
 339                         double tc = t.seconds ();
 340                         int const h = tc / 3600;
 341                         tc -= h * 3600;
 342                         int const m = tc / 60;
 343                         tc -= m * 60;
 344                         int const s = tc;
 345
 346                         wxString str = wxString::Format (wxT ("%02d:%02d:%02d"), h, m, s);
 347                         wxDouble str_width;
 348                         wxDouble str_height;
 349                         wxDouble str_descent;
 350                         wxDouble str_leading;
 351                         gc->GetTextExtent (str, &str_width, &str_height, &str_descent, &str_leading);
 352
 353                         int const tx = _timeline.x_offset() + t.seconds() * pps;
 354                         if ((tx + str_width) < _timeline.width()) {
 355                                 gc->DrawText (str, time_x (t), _y + 16);
 356                         }
 357
 358                         t += DCPTime::from_seconds (mark_interval);
 359                 }
 360         }
 361
 362 private:
 363         int _y;
 364 };
 365
 366
 367 Timeline::Timeline (wxWindow* parent, FilmEditor* ed, shared_ptr<Film> film)
 368         : wxPanel (parent, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE)
 369         , _film_editor (ed)
 370         , _film (film)
 371         , _time_axis_view (new TimeAxisView (*this, 32))
 372         , _tracks (0)
 373         , _left_down (false)
 374         , _down_view_position (0)
 375         , _first_move (false)
 376         , _menu (this)
 377         , _snap (true)
 378 {
 379 #ifndef __WXOSX__
 380         SetDoubleBuffered (true);
 381 #endif
 382
 383         Bind (wxEVT_PAINT,      boost::bind (&Timeline::paint,       this));
 384         Bind (wxEVT_LEFT_DOWN,  boost::bind (&Timeline::left_down,   this, _1));
 385         Bind (wxEVT_LEFT_UP,    boost::bind (&Timeline::left_up,     this, _1));
 386         Bind (wxEVT_RIGHT_DOWN, boost::bind (&Timeline::right_down,  this, _1));
 387         Bind (wxEVT_MOTION,     boost::bind (&Timeline::mouse_moved, this, _1));
 388         Bind (wxEVT_SIZE,       boost::bind (&Timeline::resized,     this));
 389
 390         playlist_changed ();
 391
 392         SetMinSize (wxSize (640, tracks() * track_height() + 96));
 393
 394         _playlist_changed_connection = film->playlist()->Changed.connect (bind (&Timeline::playlist_changed, this));
 395         _playlist_content_changed_connection = film->playlist()->ContentChanged.connect (bind (&Timeline::playlist_content_changed, this, _2));
 396 }
 397
 398 void
 399 Timeline::paint ()
 400 {
 401         wxPaintDC dc (this);
 402
 403         wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
 404         if (!gc) {
 405                 return;
 406         }
 407
 408         gc->SetFont (gc->CreateFont (*wxNORMAL_FONT));
 409
 410         for (ViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 411                 (*i)->paint (gc);
 412         }
 413
 414         delete gc;
 415 }
 416
 417 void
 418 Timeline::playlist_changed ()
 419 {
 420         ensure_ui_thread ();
 421
 422         shared_ptr<const Film> fl = _film.lock ();
 423         if (!fl) {
 424                 return;
 425         }
 426
 427         _views.clear ();
 428         _views.push_back (_time_axis_view);
 429
 430         ContentList content = fl->playlist()->content ();
 431
 432         for (ContentList::iterator i = content.begin(); i != content.end(); ++i) {
 433                 if (dynamic_pointer_cast<VideoContent> (*i)) {
 434                         _views.push_back (shared_ptr<View> (new VideoContentView (*this, *i)));
 435                 }
 436                 if (dynamic_pointer_cast<AudioContent> (*i)) {
 437                         _views.push_back (shared_ptr<View> (new AudioContentView (*this, *i)));
 438                 }
 439
 440                 shared_ptr<SubtitleContent> sc = dynamic_pointer_cast<SubtitleContent> (*i);
 441                 if (sc && sc->has_subtitles ()) {
 442                         _views.push_back (shared_ptr<View> (new SubtitleContentView (*this, *i)));
 443                 }
 444         }
 445
 446         assign_tracks ();
 447         setup_pixels_per_second ();
 448         Refresh ();
 449 }
 450
 451 void
 452 Timeline::playlist_content_changed (int property)
 453 {
 454         ensure_ui_thread ();
 455
 456         if (property == ContentProperty::POSITION) {
 457                 assign_tracks ();
 458                 setup_pixels_per_second ();
 459                 Refresh ();
 460         }
 461 }
 462
 463 void
 464 Timeline::assign_tracks ()
 465 {
 466         for (ViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 467                 shared_ptr<ContentView> c = dynamic_pointer_cast<ContentView> (*i);
 468                 if (c) {
 469                         c->unset_track ();
 470                 }
 471         }
 472
 473         for (ViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 474                 shared_ptr<ContentView> cv = dynamic_pointer_cast<ContentView> (*i);
 475                 if (!cv) {
 476                         continue;
 477                 }
 478
 479                 shared_ptr<Content> content = cv->content();
 480
 481                 int t = 0;
 482                 while (true) {
 483                         ViewList::iterator j = _views.begin();
 484                         while (j != _views.end()) {
 485                                 shared_ptr<ContentView> test = dynamic_pointer_cast<ContentView> (*j);
 486                                 if (!test) {
 487                                         ++j;
 488                                         continue;
 489                                 }
 490
 491                                 shared_ptr<Content> test_content = test->content();
 492
 493                                 if (test && test->track() && test->track().get() == t) {
 494                                         bool const no_overlap =
 495                                                 (content->position() < test_content->position() && content->end() < test_content->position()) ||
 496                                                 (content->position() > test_content->end()      && content->end() > test_content->end());
 497
 498                                         if (!no_overlap) {
 499                                                 /* we have an overlap on track `t' */
 500                                                 ++t;
 501                                                 break;
 502                                         }
 503                                 }
 504
 505                                 ++j;
 506                         }
 507
 508                         if (j == _views.end ()) {
 509                                 /* no overlap on `t' */
 510                                 break;
 511                         }
 512                 }
 513
 514                 cv->set_track (t);
 515                 _tracks = max (_tracks, t + 1);
 516         }
 517
 518         _time_axis_view->set_y (tracks() * track_height() + 32);
 519 }
 520
 521 int
 522 Timeline::tracks () const
 523 {
 524         return _tracks;
 525 }
 526
 527 void
 528 Timeline::setup_pixels_per_second ()
 529 {
 530         shared_ptr<const Film> film = _film.lock ();
 531         if (!film || film->length() == DCPTime ()) {
 532                 return;
 533         }
 534
 535         _pixels_per_second = static_cast<double>(width() - x_offset() * 2) / film->length().seconds ();
 536 }
 537
 538 shared_ptr<View>
 539 Timeline::event_to_view (wxMouseEvent& ev)
 540 {
 541         ViewList::iterator i = _views.begin();
 542         Position<int> const p (ev.GetX(), ev.GetY());
 543         while (i != _views.end() && !(*i)->bbox().contains (p)) {
 544                 ++i;
 545         }
 546
 547         if (i == _views.end ()) {
 548                 return shared_ptr<View> ();
 549         }
 550
 551         return *i;
 552 }
 553
 554 void
 555 Timeline::left_down (wxMouseEvent& ev)
 556 {
 557         shared_ptr<View> view = event_to_view (ev);
 558         shared_ptr<ContentView> content_view = dynamic_pointer_cast<ContentView> (view);
 559
 560         _down_view.reset ();
 561
 562         if (content_view) {
 563                 _down_view = content_view;
 564                 _down_view_position = content_view->content()->position ();
 565         }
 566
 567         for (ViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 568                 shared_ptr<ContentView> cv = dynamic_pointer_cast<ContentView> (*i);
 569                 if (!cv) {
 570                         continue;
 571                 }
 572
 573                 if (!ev.ShiftDown ()) {
 574                         cv->set_selected (view == *i);
 575                 }
 576
 577                 if (view == *i) {
 578                         _film_editor->set_selection (cv->content ());
 579                 }
 580         }
 581
 582         if (content_view && ev.ShiftDown ()) {
 583                 content_view->set_selected (!content_view->selected ());
 584         }
 585
 586         _left_down = true;
 587         _down_point = ev.GetPosition ();
 588         _first_move = false;
 589
 590         if (_down_view) {
 591                 _down_view->content()->set_change_signals_frequent (true);
 592         }
 593 }
 594
 595 void
 596 Timeline::left_up (wxMouseEvent& ev)
 597 {
 598         _left_down = false;
 599
 600         if (_down_view) {
 601                 _down_view->content()->set_change_signals_frequent (false);
 602         }
 603
 604         set_position_from_event (ev);
 605 }
 606
 607 void
 608 Timeline::mouse_moved (wxMouseEvent& ev)
 609 {
 610         if (!_left_down) {
 611                 return;
 612         }
 613
 614         set_position_from_event (ev);
 615 }
 616
 617 void
 618 Timeline::right_down (wxMouseEvent& ev)
 619 {
 620         shared_ptr<View> view = event_to_view (ev);
 621         shared_ptr<ContentView> cv = dynamic_pointer_cast<ContentView> (view);
 622         if (!cv) {
 623                 return;
 624         }
 625
 626         if (!cv->selected ()) {
 627                 clear_selection ();
 628                 cv->set_selected (true);
 629         }
 630
 631         _menu.popup (_film, selected_content (), ev.GetPosition ());
 632 }
 633
 634 void
 635 Timeline::set_position_from_event (wxMouseEvent& ev)
 636 {
 637         if (!_pixels_per_second) {
 638                 return;
 639         }
 640
 641         double const pps = _pixels_per_second.get ();
 642
 643         wxPoint const p = ev.GetPosition();
 644
 645         if (!_first_move) {
 646                 /* We haven't moved yet; in that case, we must move the mouse some reasonable distance
 647                    before the drag is considered to have started.
 648                 */
 649                 int const dist = sqrt (pow (p.x - _down_point.x, 2) + pow (p.y - _down_point.y, 2));
 650                 if (dist < 8) {
 651                         return;
 652                 }
 653                 _first_move = true;
 654         }
 655
 656         if (!_down_view) {
 657                 return;
 658         }
 659
 660         DCPTime new_position = _down_view_position + DCPTime::from_seconds ((p.x - _down_point.x) / pps);
 661
 662         if (_snap) {
 663
 664                 bool first = true;
 665                 DCPTime nearest_distance = DCPTime::max ();
 666                 DCPTime nearest_new_position = DCPTime::max ();
 667
 668                 /* Find the nearest content edge; this is inefficient */
 669                 for (ViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 670                         shared_ptr<ContentView> cv = dynamic_pointer_cast<ContentView> (*i);
 671                         if (!cv || cv == _down_view) {
 672                                 continue;
 673                         }
 674
 675                         {
 676                                 /* Snap starts to ends */
 677                                 DCPTime const d = DCPTime (cv->content()->end() - new_position).abs ();
 678                                 if (first || d < nearest_distance) {
 679                                         nearest_distance = d;
 680                                         nearest_new_position = cv->content()->end();
 681                                 }
 682                         }
 683
 684                         {
 685                                 /* Snap ends to starts */
 686                                 DCPTime const d = DCPTime (
 687                                         cv->content()->position() - (new_position + _down_view->content()->length_after_trim())
 688                                         ).abs ();
 689
 690                                 if (d < nearest_distance) {
 691                                         nearest_distance = d;
 692                                         nearest_new_position = cv->content()->position() - _down_view->content()->length_after_trim ();
 693                                 }
 694                         }
 695
 696                         first = false;
 697                 }
 698
 699                 if (!first) {
 700                         /* Snap if it's close; `close' means within a proportion of the time on the timeline */
 701                         if (nearest_distance < DCPTime::from_seconds ((width() / pps) / 32)) {
 702                                 new_position = nearest_new_position;
 703                         }
 704                 }
 705         }
 706
 707         if (new_position < DCPTime ()) {
 708                 new_position = DCPTime ();
 709         }
 710
 711         _down_view->content()->set_position (new_position);
 712
 713         shared_ptr<Film> film = _film.lock ();
 714         assert (film);
 715         film->set_sequence_video (false);
 716 }
 717
 718 void
 719 Timeline::force_redraw (dcpomatic::Rect<int> const & r)
 720 {
 721         RefreshRect (wxRect (r.x, r.y, r.width, r.height), false);
 722 }
 723
 724 shared_ptr<const Film>
 725 Timeline::film () const
 726 {
 727         return _film.lock ();
 728 }
 729
 730 void
 731 Timeline::resized ()
 732 {
 733         setup_pixels_per_second ();
 734 }
 735
 736 void
 737 Timeline::clear_selection ()
 738 {
 739         for (ViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 740                 shared_ptr<ContentView> cv = dynamic_pointer_cast<ContentView> (*i);
 741                 if (cv) {
 742                         cv->set_selected (false);
 743                 }
 744         }
 745 }
 746
 747 Timeline::ContentViewList
 748 Timeline::selected_views () const
 749 {
 750         ContentViewList sel;
 751
 752         for (ViewList::const_iterator i = _views.begin(); i != _views.end(); ++i) {
 753                 shared_ptr<ContentView> cv = dynamic_pointer_cast<ContentView> (*i);
 754                 if (cv && cv->selected()) {
 755                         sel.push_back (cv);
 756                 }
 757         }
 758
 759         return sel;
 760 }
 761
 762 ContentList
 763 Timeline::selected_content () const
 764 {
 765         ContentList sel;
 766         ContentViewList views = selected_views ();
 767
 768         for (ContentViewList::const_iterator i = views.begin(); i != views.end(); ++i) {
 769                 sel.push_back ((*i)->content ());
 770         }
 771
 772         return sel;
 773 }