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         , _track_height (48)
  75 {
  76 #ifndef __WXOSX__
  77         _labels_panel->SetDoubleBuffered (true);
  78         _main_canvas->SetDoubleBuffered (true);
  79 #endif
  80
  81         wxSizer* sizer = new wxBoxSizer (wxHORIZONTAL);
  82         sizer->Add (_labels_panel, 0, wxEXPAND);
  83         _labels_panel->SetMinSize (wxSize (_labels_view->bbox().width, -1));
  84         sizer->Add (_main_canvas, 1, wxEXPAND);
  85         SetSizer (sizer);
  86
  87         _labels_panel->Bind (wxEVT_PAINT,      boost::bind (&Timeline::paint_labels, this));
  88         _main_canvas->Bind  (wxEVT_PAINT,      boost::bind (&Timeline::paint_main,   this));
  89         _main_canvas->Bind  (wxEVT_LEFT_DOWN,  boost::bind (&Timeline::left_down,    this, _1));
  90         _main_canvas->Bind  (wxEVT_LEFT_UP,    boost::bind (&Timeline::left_up,      this, _1));
  91         _main_canvas->Bind  (wxEVT_RIGHT_DOWN, boost::bind (&Timeline::right_down,   this, _1));
  92         _main_canvas->Bind  (wxEVT_MOTION,     boost::bind (&Timeline::mouse_moved,  this, _1));
  93         _main_canvas->Bind  (wxEVT_SIZE,       boost::bind (&Timeline::resized,      this));
  94
  95         film_changed (Film::CONTENT);
  96
  97         SetMinSize (wxSize (640, 4 * track_height() + 96));
  98
  99         _film_changed_connection = film->Changed.connect (bind (&Timeline::film_changed, this, _1));
 100         _film_content_changed_connection = film->ContentChanged.connect (bind (&Timeline::film_content_changed, this, _2, _3));
 101
 102         _pixels_per_second = max (0.01, static_cast<double>(640) / film->length().seconds ());
 103
 104         setup_scrollbars ();
 105         _main_canvas->EnableScrolling (true, true);
 106 }
 107
 108 void
 109 Timeline::paint_labels ()
 110 {
 111         wxPaintDC dc (_labels_panel);
 112
 113         wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
 114         if (!gc) {
 115                 return;
 116         }
 117
 118         _labels_view->paint (gc, list<dcpomatic::Rect<int> >());
 119
 120         delete gc;
 121 }
 122
 123 void
 124 Timeline::paint_main ()
 125 {
 126         wxPaintDC dc (_main_canvas);
 127         _main_canvas->DoPrepareDC (dc);
 128
 129         wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
 130         if (!gc) {
 131                 return;
 132         }
 133
 134         int vsx, vsy;
 135         _main_canvas->GetViewStart (&vsx, &vsy);
 136         gc->Translate (-vsx * _x_scroll_rate, -vsy * _y_scroll_rate);
 137
 138         gc->SetAntialiasMode (wxANTIALIAS_DEFAULT);
 139
 140         BOOST_FOREACH (shared_ptr<TimelineView> i, _views) {
 141
 142                 shared_ptr<TimelineContentView> ic = dynamic_pointer_cast<TimelineContentView> (i);
 143
 144                 /* Find areas of overlap with other content views, so that we can plot them */
 145                 list<dcpomatic::Rect<int> > overlaps;
 146                 BOOST_FOREACH (shared_ptr<TimelineView> j, _views) {
 147                         shared_ptr<TimelineContentView> jc = dynamic_pointer_cast<TimelineContentView> (j);
 148                         /* No overlap with non-content views, views no different tracks, audio views or non-active views */
 149                         if (!ic || !jc || i == j || ic->track() != jc->track() || ic->track().get_value_or(2) >= 2 || !ic->active() || !jc->active()) {
 150                                 continue;
 151                         }
 152
 153                         optional<dcpomatic::Rect<int> > r = j->bbox().intersection (i->bbox());
 154                         if (r) {
 155                                 overlaps.push_back (r.get ());
 156                         }
 157                 }
 158
 159                 i->paint (gc, overlaps);
 160         }
 161
 162         if (_zoom_point) {
 163                 /* Translate back as _down_point and _zoom_point do not take scroll into account */
 164                 gc->Translate (vsx * _x_scroll_rate, vsy * _y_scroll_rate);
 165                 gc->SetPen (*wxBLACK_PEN);
 166                 gc->SetBrush (*wxTRANSPARENT_BRUSH);
 167                 gc->DrawRectangle (
 168                         min (_down_point.x, _zoom_point->x),
 169                         min (_down_point.y, _zoom_point->y),
 170                         fabs (_down_point.x - _zoom_point->x),
 171                         fabs (_down_point.y - _zoom_point->y)
 172                         );
 173         }
 174
 175         delete gc;
 176 }
 177
 178 void
 179 Timeline::film_changed (Film::Property p)
 180 {
 181         if (p == Film::CONTENT || p == Film::REEL_TYPE || p == Film::REEL_LENGTH) {
 182                 ensure_ui_thread ();
 183                 recreate_views ();
 184         } else if (p == Film::CONTENT_ORDER) {
 185                 Refresh ();
 186         }
 187 }
 188
 189 void
 190 Timeline::recreate_views ()
 191 {
 192         shared_ptr<const Film> film = _film.lock ();
 193         if (!film) {
 194                 return;
 195         }
 196
 197         _views.clear ();
 198         _views.push_back (_time_axis_view);
 199         _views.push_back (_reels_view);
 200
 201         BOOST_FOREACH (shared_ptr<Content> i, film->content ()) {
 202                 if (i->video) {
 203                         _views.push_back (shared_ptr<TimelineView> (new TimelineVideoContentView (*this, i)));
 204                 }
 205
 206                 if (i->audio && !i->audio->mapping().mapped_output_channels().empty ()) {
 207                         _views.push_back (shared_ptr<TimelineView> (new TimelineAudioContentView (*this, i)));
 208                 }
 209
 210                 if (i->subtitle) {
 211                         _views.push_back (shared_ptr<TimelineView> (new TimelineSubtitleContentView (*this, i)));
 212                 }
 213
 214                 if (dynamic_pointer_cast<AtmosMXFContent> (i)) {
 215                         _views.push_back (shared_ptr<TimelineView> (new TimelineAtmosContentView (*this, i)));
 216                 }
 217         }
 218
 219         assign_tracks ();
 220         setup_scrollbars ();
 221         Refresh ();
 222 }
 223
 224 void
 225 Timeline::film_content_changed (int property, bool frequent)
 226 {
 227         ensure_ui_thread ();
 228
 229         if (property == AudioContentProperty::STREAMS) {
 230                 recreate_views ();
 231         } else if (!frequent) {
 232                 setup_scrollbars ();
 233                 Refresh ();
 234         }
 235 }
 236
 237 template <class T>
 238 int
 239 place (TimelineViewList& views, int& tracks)
 240 {
 241         int const base = tracks;
 242
 243         BOOST_FOREACH (shared_ptr<TimelineView> i, views) {
 244                 if (!dynamic_pointer_cast<T>(i)) {
 245                         continue;
 246                 }
 247
 248                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (i);
 249
 250                 int t = base;
 251
 252                 shared_ptr<Content> content = cv->content();
 253                 DCPTimePeriod const content_period (content->position(), content->end());
 254
 255                 while (true) {
 256                         TimelineViewList::iterator j = views.begin();
 257                         while (j != views.end()) {
 258                                 shared_ptr<T> test = dynamic_pointer_cast<T> (*j);
 259                                 if (!test) {
 260                                         ++j;
 261                                         continue;
 262                                 }
 263
 264                                 shared_ptr<Content> test_content = test->content();
 265                                 if (
 266                                         test->track() && test->track().get() == t &&
 267                                         content_period.overlap(DCPTimePeriod(test_content->position(), test_content->end()))) {
 268                                         /* we have an overlap on track `t' */
 269                                         ++t;
 270                                         break;
 271                                 }
 272
 273                                 ++j;
 274                         }
 275
 276                         if (j == views.end ()) {
 277                                 /* no overlap on `t' */
 278                                 break;
 279                         }
 280                 }
 281
 282                 cv->set_track (t);
 283                 tracks = max (tracks, t + 1);
 284         }
 285
 286         return tracks - base;
 287 }
 288
 289 void
 290 Timeline::assign_tracks ()
 291 {
 292         /* Tracks are:
 293            Video (mono or left-eye)
 294            Video (right-eye)
 295            Subtitle 1
 296            Subtitle 2
 297            Subtitle N
 298            Atmos
 299            Audio 1
 300            Audio 2
 301            Audio N
 302         */
 303
 304         _tracks = 0;
 305
 306         for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 307                 shared_ptr<TimelineContentView> c = dynamic_pointer_cast<TimelineContentView> (*i);
 308                 if (c) {
 309                         c->unset_track ();
 310                 }
 311         }
 312
 313         /* Video */
 314
 315         bool have_3d = false;
 316         BOOST_FOREACH (shared_ptr<TimelineView> i, _views) {
 317                 shared_ptr<TimelineVideoContentView> cv = dynamic_pointer_cast<TimelineVideoContentView> (i);
 318                 if (!cv) {
 319                         continue;
 320                 }
 321
 322                 /* Video on tracks 0 and maybe 1 (left and right eye) */
 323                 if (cv->content()->video->frame_type() == VIDEO_FRAME_TYPE_3D_RIGHT) {
 324                         cv->set_track (1);
 325                         _tracks = max (_tracks, 2);
 326                         have_3d = true;
 327                 } else {
 328                         cv->set_track (0);
 329                 }
 330         }
 331
 332         _tracks = max (_tracks, 1);
 333
 334         /* Subtitle */
 335
 336         int const subtitle_tracks = place<TimelineSubtitleContentView> (_views, _tracks);
 337
 338         /* Atmos */
 339
 340         bool have_atmos = false;
 341         BOOST_FOREACH (shared_ptr<TimelineView> i, _views) {
 342                 shared_ptr<TimelineVideoContentView> cv = dynamic_pointer_cast<TimelineVideoContentView> (i);
 343                 if (!cv) {
 344                         continue;
 345                 }
 346                 if (dynamic_pointer_cast<TimelineAtmosContentView> (i)) {
 347                         cv->set_track (_tracks - 1);
 348                         have_atmos = true;
 349                 }
 350         }
 351
 352         if (have_atmos) {
 353                 ++_tracks;
 354         }
 355
 356         /* Audio */
 357
 358         place<TimelineAudioContentView> (_views, _tracks);
 359
 360         _labels_view->set_3d (have_3d);
 361         _labels_view->set_subtitle_tracks (subtitle_tracks);
 362         _labels_view->set_atmos (have_atmos);
 363
 364         _time_axis_view->set_y (tracks() * track_height() + 64);
 365         _reels_view->set_y (8);
 366 }
 367
 368 int
 369 Timeline::tracks () const
 370 {
 371         return _tracks;
 372 }
 373
 374 void
 375 Timeline::setup_scrollbars ()
 376 {
 377         shared_ptr<const Film> film = _film.lock ();
 378         if (!film || !_pixels_per_second) {
 379                 return;
 380         }
 381         _main_canvas->SetVirtualSize (*_pixels_per_second * film->length().seconds(), tracks() * track_height() + 96);
 382         _main_canvas->SetScrollRate (_x_scroll_rate, _y_scroll_rate);
 383 }
 384
 385 shared_ptr<TimelineView>
 386 Timeline::event_to_view (wxMouseEvent& ev)
 387 {
 388         /* Search backwards through views so that we find the uppermost one first */
 389         TimelineViewList::reverse_iterator i = _views.rbegin();
 390         Position<int> const p (ev.GetX(), ev.GetY());
 391         while (i != _views.rend() && !(*i)->bbox().contains (p)) {
 392                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 393                 ++i;
 394         }
 395
 396         if (i == _views.rend ()) {
 397                 return shared_ptr<TimelineView> ();
 398         }
 399
 400         return *i;
 401 }
 402
 403 void
 404 Timeline::left_down (wxMouseEvent& ev)
 405 {
 406         _left_down = true;
 407         _down_point = ev.GetPosition ();
 408
 409         switch (_tool) {
 410         case SELECT:
 411                 left_down_select (ev);
 412                 break;
 413         case ZOOM:
 414                 /* Nothing to do */
 415                 break;
 416         }
 417 }
 418
 419 void
 420 Timeline::left_down_select (wxMouseEvent& ev)
 421 {
 422         shared_ptr<TimelineView> view = event_to_view (ev);
 423         shared_ptr<TimelineContentView> content_view = dynamic_pointer_cast<TimelineContentView> (view);
 424
 425         _down_view.reset ();
 426
 427         if (content_view) {
 428                 _down_view = content_view;
 429                 _down_view_position = content_view->content()->position ();
 430         }
 431
 432         for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 433                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 434                 if (!cv) {
 435                         continue;
 436                 }
 437
 438                 if (!ev.ShiftDown ()) {
 439                         cv->set_selected (view == *i);
 440                 }
 441         }
 442
 443         if (content_view && ev.ShiftDown ()) {
 444                 content_view->set_selected (!content_view->selected ());
 445         }
 446
 447         _first_move = false;
 448
 449         if (_down_view) {
 450                 /* Pre-compute the points that we might snap to */
 451                 for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 452                         shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 453                         if (!cv || cv == _down_view || cv->content() == _down_view->content()) {
 454                                 continue;
 455                         }
 456
 457                         _start_snaps.push_back (cv->content()->position());
 458                         _end_snaps.push_back (cv->content()->position());
 459                         _start_snaps.push_back (cv->content()->end());
 460                         _end_snaps.push_back (cv->content()->end());
 461
 462                         BOOST_FOREACH (DCPTime i, cv->content()->reel_split_points()) {
 463                                 _start_snaps.push_back (i);
 464                         }
 465                 }
 466
 467                 /* Tell everyone that things might change frequently during the drag */
 468                 _down_view->content()->set_change_signals_frequent (true);
 469         }
 470 }
 471
 472 void
 473 Timeline::left_up (wxMouseEvent& ev)
 474 {
 475         _left_down = false;
 476
 477         switch (_tool) {
 478         case SELECT:
 479                 left_up_select (ev);
 480                 break;
 481         case ZOOM:
 482                 left_up_zoom (ev);
 483                 break;
 484         }
 485 }
 486
 487 void
 488 Timeline::left_up_select (wxMouseEvent& ev)
 489 {
 490         if (_down_view) {
 491                 _down_view->content()->set_change_signals_frequent (false);
 492         }
 493
 494         _content_panel->set_selection (selected_content ());
 495         set_position_from_event (ev);
 496
 497         /* Clear up up the stuff we don't do during drag */
 498         assign_tracks ();
 499         setup_scrollbars ();
 500         Refresh ();
 501
 502         _start_snaps.clear ();
 503         _end_snaps.clear ();
 504 }
 505
 506 void
 507 Timeline::left_up_zoom (wxMouseEvent& ev)
 508 {
 509         _zoom_point = ev.GetPosition ();
 510
 511         int vsx, vsy;
 512         _main_canvas->GetViewStart (&vsx, &vsy);
 513
 514         wxPoint top_left(min(_down_point.x, _zoom_point->x), min(_down_point.y, _zoom_point->y));
 515         wxPoint bottom_right(max(_down_point.x, _zoom_point->x), max(_down_point.y, _zoom_point->y));
 516
 517         DCPTime const time_left = DCPTime::from_seconds((top_left.x + vsx) / *_pixels_per_second);
 518         DCPTime const time_right = DCPTime::from_seconds((bottom_right.x + vsx) / *_pixels_per_second);
 519         _pixels_per_second = GetSize().GetWidth() / (time_right.seconds() - time_left.seconds());
 520
 521         double const tracks_top = double(top_left.y) / _track_height;
 522         double const tracks_bottom = double(bottom_right.y) / _track_height;
 523         _track_height = GetSize().GetHeight() / (tracks_bottom - tracks_top);
 524         cout << tracks_top << " " << tracks_bottom << "\n";
 525
 526         setup_scrollbars ();
 527         _main_canvas->Scroll (time_left.seconds() * *_pixels_per_second / _x_scroll_rate, tracks_top * _track_height / _y_scroll_rate);
 528
 529         _zoom_point = optional<wxPoint> ();
 530         Refresh ();
 531 }
 532
 533 void
 534 Timeline::mouse_moved (wxMouseEvent& ev)
 535 {
 536         switch (_tool) {
 537         case SELECT:
 538                 mouse_moved_select (ev);
 539                 break;
 540         case ZOOM:
 541                 mouse_moved_zoom (ev);
 542                 break;
 543         }
 544 }
 545
 546 void
 547 Timeline::mouse_moved_select (wxMouseEvent& ev)
 548 {
 549         if (!_left_down) {
 550                 return;
 551         }
 552
 553         set_position_from_event (ev);
 554 }
 555
 556 void
 557 Timeline::mouse_moved_zoom (wxMouseEvent& ev)
 558 {
 559         if (!_left_down) {
 560                 return;
 561         }
 562
 563         _zoom_point = ev.GetPosition ();
 564         Refresh ();
 565 }
 566
 567 void
 568 Timeline::right_down (wxMouseEvent& ev)
 569 {
 570         switch (_tool) {
 571         case SELECT:
 572                 right_down_select (ev);
 573                 break;
 574         case ZOOM:
 575                 /* Zoom out */
 576                 _pixels_per_second = *_pixels_per_second / 2;
 577                 _track_height = max (8, _track_height / 2);
 578                 setup_scrollbars ();
 579                 break;
 580         }
 581 }
 582
 583 void
 584 Timeline::right_down_select (wxMouseEvent& ev)
 585 {
 586         shared_ptr<TimelineView> view = event_to_view (ev);
 587         shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (view);
 588         if (!cv) {
 589                 return;
 590         }
 591
 592         if (!cv->selected ()) {
 593                 clear_selection ();
 594                 cv->set_selected (true);
 595         }
 596
 597         _menu.popup (_film, selected_content (), selected_views (), ev.GetPosition ());
 598 }
 599
 600 void
 601 Timeline::maybe_snap (DCPTime a, DCPTime b, optional<DCPTime>& nearest_distance) const
 602 {
 603         DCPTime const d = a - b;
 604         if (!nearest_distance || d.abs() < nearest_distance.get().abs()) {
 605                 nearest_distance = d;
 606         }
 607 }
 608
 609 void
 610 Timeline::set_position_from_event (wxMouseEvent& ev)
 611 {
 612         if (!_pixels_per_second) {
 613                 return;
 614         }
 615
 616         double const pps = _pixels_per_second.get ();
 617
 618         wxPoint const p = ev.GetPosition();
 619
 620         if (!_first_move) {
 621                 /* We haven't moved yet; in that case, we must move the mouse some reasonable distance
 622                    before the drag is considered to have started.
 623                 */
 624                 int const dist = sqrt (pow (p.x - _down_point.x, 2) + pow (p.y - _down_point.y, 2));
 625                 if (dist < 8) {
 626                         return;
 627                 }
 628                 _first_move = true;
 629         }
 630
 631         if (!_down_view) {
 632                 return;
 633         }
 634
 635         DCPTime new_position = _down_view_position + DCPTime::from_seconds ((p.x - _down_point.x) / pps);
 636
 637         if (_snap) {
 638
 639                 DCPTime const new_end = new_position + _down_view->content()->length_after_trim();
 640                 /* Signed `distance' to nearest thing (i.e. negative is left on the timeline,
 641                    positive is right).
 642                 */
 643                 optional<DCPTime> nearest_distance;
 644
 645                 /* Find the nearest snap point */
 646
 647                 BOOST_FOREACH (DCPTime i, _start_snaps) {
 648                         maybe_snap (i, new_position, nearest_distance);
 649                 }
 650
 651                 BOOST_FOREACH (DCPTime i, _end_snaps) {
 652                         maybe_snap (i, new_end, nearest_distance);
 653                 }
 654
 655                 if (nearest_distance) {
 656                         /* Snap if it's close; `close' means within a proportion of the time on the timeline */
 657                         if (nearest_distance.get().abs() < DCPTime::from_seconds ((width() / pps) / 64)) {
 658                                 new_position += nearest_distance.get ();
 659                         }
 660                 }
 661         }
 662
 663         if (new_position < DCPTime ()) {
 664                 new_position = DCPTime ();
 665         }
 666
 667         _down_view->content()->set_position (new_position);
 668
 669         shared_ptr<Film> film = _film.lock ();
 670         DCPOMATIC_ASSERT (film);
 671         film->set_sequence (false);
 672 }
 673
 674 void
 675 Timeline::force_redraw (dcpomatic::Rect<int> const & r)
 676 {
 677         RefreshRect (wxRect (r.x, r.y, r.width, r.height), false);
 678 }
 679
 680 shared_ptr<const Film>
 681 Timeline::film () const
 682 {
 683         return _film.lock ();
 684 }
 685
 686 void
 687 Timeline::resized ()
 688 {
 689         setup_scrollbars ();
 690 }
 691
 692 void
 693 Timeline::clear_selection ()
 694 {
 695         for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 696                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 697                 if (cv) {
 698                         cv->set_selected (false);
 699                 }
 700         }
 701 }
 702
 703 TimelineContentViewList
 704 Timeline::selected_views () const
 705 {
 706         TimelineContentViewList sel;
 707
 708         for (TimelineViewList::const_iterator i = _views.begin(); i != _views.end(); ++i) {
 709                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 710                 if (cv && cv->selected()) {
 711                         sel.push_back (cv);
 712                 }
 713         }
 714
 715         return sel;
 716 }
 717
 718 ContentList
 719 Timeline::selected_content () const
 720 {
 721         ContentList sel;
 722         TimelineContentViewList views = selected_views ();
 723
 724         for (TimelineContentViewList::const_iterator i = views.begin(); i != views.end(); ++i) {
 725                 sel.push_back ((*i)->content ());
 726         }
 727
 728         return sel;
 729 }
 730
 731 void
 732 Timeline::set_selection (ContentList selection)
 733 {
 734         for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 735                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 736                 if (cv) {
 737                         cv->set_selected (find (selection.begin(), selection.end(), cv->content ()) != selection.end ());
 738                 }
 739         }
 740 }