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 /* 3 hours in 640 pixels */
  57 double const Timeline::_minimum_pixels_per_second = 640.0 / (60 * 60 * 3);
  58 int const Timeline::_minimum_track_height = 16;
  59
  60 Timeline::Timeline (wxWindow* parent, ContentPanel* cp, shared_ptr<Film> film)
  61         : wxPanel (parent, wxID_ANY)
  62         , _labels_canvas (new wxScrolledCanvas (this, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE))
  63         , _main_canvas (new wxScrolledCanvas (this, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE))
  64         , _content_panel (cp)
  65         , _film (film)
  66         , _time_axis_view (new TimelineTimeAxisView (*this, 64))
  67         , _reels_view (new TimelineReelsView (*this, 32))
  68         , _labels_view (new TimelineLabelsView (*this))
  69         , _tracks (0)
  70         , _left_down (false)
  71         , _down_view_position (0)
  72         , _first_move (false)
  73         , _menu (this)
  74         , _snap (true)
  75         , _tool (SELECT)
  76         , _x_scroll_rate (16)
  77         , _y_scroll_rate (16)
  78         , _track_height (48)
  79 {
  80 #ifndef __WXOSX__
  81         _labels_canvas->SetDoubleBuffered (true);
  82         _main_canvas->SetDoubleBuffered (true);
  83 #endif
  84
  85         wxSizer* sizer = new wxBoxSizer (wxHORIZONTAL);
  86         sizer->Add (_labels_canvas, 0, wxEXPAND);
  87         _labels_canvas->SetMinSize (wxSize (_labels_view->bbox().width, -1));
  88         sizer->Add (_main_canvas, 1, wxEXPAND);
  89         SetSizer (sizer);
  90
  91         _labels_canvas->Bind (wxEVT_PAINT,      boost::bind (&Timeline::paint_labels, this));
  92         _main_canvas->Bind   (wxEVT_PAINT,      boost::bind (&Timeline::paint_main,   this));
  93         _main_canvas->Bind   (wxEVT_LEFT_DOWN,  boost::bind (&Timeline::left_down,    this, _1));
  94         _main_canvas->Bind   (wxEVT_LEFT_UP,    boost::bind (&Timeline::left_up,      this, _1));
  95         _main_canvas->Bind   (wxEVT_RIGHT_DOWN, boost::bind (&Timeline::right_down,   this, _1));
  96         _main_canvas->Bind   (wxEVT_MOTION,     boost::bind (&Timeline::mouse_moved,  this, _1));
  97         _main_canvas->Bind   (wxEVT_SIZE,       boost::bind (&Timeline::resized,      this));
  98         _main_canvas->Bind   (wxEVT_SCROLLWIN_THUMBTRACK,  boost::bind (&Timeline::scrolled,     this, _1));
  99
 100         film_changed (Film::CONTENT);
 101
 102         SetMinSize (wxSize (640, 4 * track_height() + 96));
 103
 104         _film_changed_connection = film->Changed.connect (bind (&Timeline::film_changed, this, _1));
 105         _film_content_changed_connection = film->ContentChanged.connect (bind (&Timeline::film_content_changed, this, _2, _3));
 106
 107         _pixels_per_second = max (_minimum_pixels_per_second, static_cast<double>(640) / film->length().seconds ());
 108
 109         setup_scrollbars ();
 110         _labels_canvas->ShowScrollbars (wxSHOW_SB_NEVER, wxSHOW_SB_NEVER);
 111 }
 112
 113 void
 114 Timeline::paint_labels ()
 115 {
 116         wxPaintDC dc (_labels_canvas);
 117
 118         wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
 119         if (!gc) {
 120                 return;
 121         }
 122
 123         int vsx, vsy;
 124         _labels_canvas->GetViewStart (&vsx, &vsy);
 125         gc->Translate (-vsx * _x_scroll_rate, -vsy * _y_scroll_rate + tracks_y_offset());
 126
 127         _labels_view->paint (gc, list<dcpomatic::Rect<int> >());
 128
 129         delete gc;
 130 }
 131
 132 void
 133 Timeline::paint_main ()
 134 {
 135         wxPaintDC dc (_main_canvas);
 136         _main_canvas->DoPrepareDC (dc);
 137
 138         wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
 139         if (!gc) {
 140                 return;
 141         }
 142
 143         int vsx, vsy;
 144         _main_canvas->GetViewStart (&vsx, &vsy);
 145         gc->Translate (-vsx * _x_scroll_rate, -vsy * _y_scroll_rate);
 146
 147         gc->SetAntialiasMode (wxANTIALIAS_DEFAULT);
 148
 149         BOOST_FOREACH (shared_ptr<TimelineView> i, _views) {
 150
 151                 shared_ptr<TimelineContentView> ic = dynamic_pointer_cast<TimelineContentView> (i);
 152
 153                 /* Find areas of overlap with other content views, so that we can plot them */
 154                 list<dcpomatic::Rect<int> > overlaps;
 155                 BOOST_FOREACH (shared_ptr<TimelineView> j, _views) {
 156                         shared_ptr<TimelineContentView> jc = dynamic_pointer_cast<TimelineContentView> (j);
 157                         /* No overlap with non-content views, views no different tracks, audio views or non-active views */
 158                         if (!ic || !jc || i == j || ic->track() != jc->track() || ic->track().get_value_or(2) >= 2 || !ic->active() || !jc->active()) {
 159                                 continue;
 160                         }
 161
 162                         optional<dcpomatic::Rect<int> > r = j->bbox().intersection (i->bbox());
 163                         if (r) {
 164                                 overlaps.push_back (r.get ());
 165                         }
 166                 }
 167
 168                 i->paint (gc, overlaps);
 169         }
 170
 171         if (_zoom_point) {
 172                 /* Translate back as _down_point and _zoom_point do not take scroll into account */
 173                 gc->Translate (vsx * _x_scroll_rate, vsy * _y_scroll_rate);
 174                 gc->SetPen (*wxBLACK_PEN);
 175                 gc->SetBrush (*wxTRANSPARENT_BRUSH);
 176                 gc->DrawRectangle (
 177                         min (_down_point.x, _zoom_point->x),
 178                         min (_down_point.y, _zoom_point->y),
 179                         fabs (_down_point.x - _zoom_point->x),
 180                         fabs (_down_point.y - _zoom_point->y)
 181                         );
 182         }
 183
 184         delete gc;
 185 }
 186
 187 void
 188 Timeline::film_changed (Film::Property p)
 189 {
 190         if (p == Film::CONTENT || p == Film::REEL_TYPE || p == Film::REEL_LENGTH) {
 191                 ensure_ui_thread ();
 192                 recreate_views ();
 193         } else if (p == Film::CONTENT_ORDER) {
 194                 Refresh ();
 195         }
 196 }
 197
 198 void
 199 Timeline::recreate_views ()
 200 {
 201         shared_ptr<const Film> film = _film.lock ();
 202         if (!film) {
 203                 return;
 204         }
 205
 206         _views.clear ();
 207         _views.push_back (_time_axis_view);
 208         _views.push_back (_reels_view);
 209
 210         BOOST_FOREACH (shared_ptr<Content> i, film->content ()) {
 211                 if (i->video) {
 212                         _views.push_back (shared_ptr<TimelineView> (new TimelineVideoContentView (*this, i)));
 213                 }
 214
 215                 if (i->audio && !i->audio->mapping().mapped_output_channels().empty ()) {
 216                         _views.push_back (shared_ptr<TimelineView> (new TimelineAudioContentView (*this, i)));
 217                 }
 218
 219                 if (i->subtitle) {
 220                         _views.push_back (shared_ptr<TimelineView> (new TimelineSubtitleContentView (*this, i)));
 221                 }
 222
 223                 if (dynamic_pointer_cast<AtmosMXFContent> (i)) {
 224                         _views.push_back (shared_ptr<TimelineView> (new TimelineAtmosContentView (*this, i)));
 225                 }
 226         }
 227
 228         assign_tracks ();
 229         setup_scrollbars ();
 230         Refresh ();
 231 }
 232
 233 void
 234 Timeline::film_content_changed (int property, bool frequent)
 235 {
 236         ensure_ui_thread ();
 237
 238         if (property == AudioContentProperty::STREAMS) {
 239                 recreate_views ();
 240         } else if (!frequent) {
 241                 setup_scrollbars ();
 242                 Refresh ();
 243         }
 244 }
 245
 246 template <class T>
 247 int
 248 place (TimelineViewList& views, int& tracks)
 249 {
 250         int const base = tracks;
 251
 252         BOOST_FOREACH (shared_ptr<TimelineView> i, views) {
 253                 if (!dynamic_pointer_cast<T>(i)) {
 254                         continue;
 255                 }
 256
 257                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (i);
 258
 259                 int t = base;
 260
 261                 shared_ptr<Content> content = cv->content();
 262                 DCPTimePeriod const content_period (content->position(), content->end());
 263
 264                 while (true) {
 265                         TimelineViewList::iterator j = views.begin();
 266                         while (j != views.end()) {
 267                                 shared_ptr<T> test = dynamic_pointer_cast<T> (*j);
 268                                 if (!test) {
 269                                         ++j;
 270                                         continue;
 271                                 }
 272
 273                                 shared_ptr<Content> test_content = test->content();
 274                                 if (
 275                                         test->track() && test->track().get() == t &&
 276                                         content_period.overlap(DCPTimePeriod(test_content->position(), test_content->end()))) {
 277                                         /* we have an overlap on track `t' */
 278                                         ++t;
 279                                         break;
 280                                 }
 281
 282                                 ++j;
 283                         }
 284
 285                         if (j == views.end ()) {
 286                                 /* no overlap on `t' */
 287                                 break;
 288                         }
 289                 }
 290
 291                 cv->set_track (t);
 292                 tracks = max (tracks, t + 1);
 293         }
 294
 295         return tracks - base;
 296 }
 297
 298 void
 299 Timeline::assign_tracks ()
 300 {
 301         /* Tracks are:
 302            Video (mono or left-eye)
 303            Video (right-eye)
 304            Subtitle 1
 305            Subtitle 2
 306            Subtitle N
 307            Atmos
 308            Audio 1
 309            Audio 2
 310            Audio N
 311         */
 312
 313         _tracks = 0;
 314
 315         for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 316                 shared_ptr<TimelineContentView> c = dynamic_pointer_cast<TimelineContentView> (*i);
 317                 if (c) {
 318                         c->unset_track ();
 319                 }
 320         }
 321
 322         /* Video */
 323
 324         bool have_3d = false;
 325         BOOST_FOREACH (shared_ptr<TimelineView> i, _views) {
 326                 shared_ptr<TimelineVideoContentView> cv = dynamic_pointer_cast<TimelineVideoContentView> (i);
 327                 if (!cv) {
 328                         continue;
 329                 }
 330
 331                 /* Video on tracks 0 and maybe 1 (left and right eye) */
 332                 if (cv->content()->video->frame_type() == VIDEO_FRAME_TYPE_3D_RIGHT) {
 333                         cv->set_track (1);
 334                         _tracks = max (_tracks, 2);
 335                         have_3d = true;
 336                 } else {
 337                         cv->set_track (0);
 338                 }
 339         }
 340
 341         _tracks = max (_tracks, 1);
 342
 343         /* Subtitle */
 344
 345         int const subtitle_tracks = place<TimelineSubtitleContentView> (_views, _tracks);
 346
 347         /* Atmos */
 348
 349         bool have_atmos = false;
 350         BOOST_FOREACH (shared_ptr<TimelineView> i, _views) {
 351                 shared_ptr<TimelineVideoContentView> cv = dynamic_pointer_cast<TimelineVideoContentView> (i);
 352                 if (!cv) {
 353                         continue;
 354                 }
 355                 if (dynamic_pointer_cast<TimelineAtmosContentView> (i)) {
 356                         cv->set_track (_tracks - 1);
 357                         have_atmos = true;
 358                 }
 359         }
 360
 361         if (have_atmos) {
 362                 ++_tracks;
 363         }
 364
 365         /* Audio */
 366
 367         place<TimelineAudioContentView> (_views, _tracks);
 368
 369         _labels_view->set_3d (have_3d);
 370         _labels_view->set_subtitle_tracks (subtitle_tracks);
 371         _labels_view->set_atmos (have_atmos);
 372
 373         _time_axis_view->set_y (tracks());
 374         _reels_view->set_y (8);
 375 }
 376
 377 int
 378 Timeline::tracks () const
 379 {
 380         return _tracks;
 381 }
 382
 383 void
 384 Timeline::setup_scrollbars ()
 385 {
 386         shared_ptr<const Film> film = _film.lock ();
 387         if (!film || !_pixels_per_second) {
 388                 return;
 389         }
 390         _labels_canvas->SetVirtualSize (_labels_view->bbox().width, tracks() * track_height() + 96);
 391         _labels_canvas->SetScrollRate (_x_scroll_rate, _y_scroll_rate);
 392         _main_canvas->SetVirtualSize (*_pixels_per_second * film->length().seconds(), tracks() * track_height() + 96);
 393         _main_canvas->SetScrollRate (_x_scroll_rate, _y_scroll_rate);
 394 }
 395
 396 shared_ptr<TimelineView>
 397 Timeline::event_to_view (wxMouseEvent& ev)
 398 {
 399         /* Search backwards through views so that we find the uppermost one first */
 400         TimelineViewList::reverse_iterator i = _views.rbegin();
 401         Position<int> const p (ev.GetX(), ev.GetY());
 402         while (i != _views.rend() && !(*i)->bbox().contains (p)) {
 403                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 404                 ++i;
 405         }
 406
 407         if (i == _views.rend ()) {
 408                 return shared_ptr<TimelineView> ();
 409         }
 410
 411         return *i;
 412 }
 413
 414 void
 415 Timeline::left_down (wxMouseEvent& ev)
 416 {
 417         _left_down = true;
 418         _down_point = ev.GetPosition ();
 419
 420         switch (_tool) {
 421         case SELECT:
 422                 left_down_select (ev);
 423                 break;
 424         case ZOOM:
 425                 /* Nothing to do */
 426                 break;
 427         }
 428 }
 429
 430 void
 431 Timeline::left_down_select (wxMouseEvent& ev)
 432 {
 433         shared_ptr<TimelineView> view = event_to_view (ev);
 434         shared_ptr<TimelineContentView> content_view = dynamic_pointer_cast<TimelineContentView> (view);
 435
 436         _down_view.reset ();
 437
 438         if (content_view) {
 439                 _down_view = content_view;
 440                 _down_view_position = content_view->content()->position ();
 441         }
 442
 443         for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 444                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 445                 if (!cv) {
 446                         continue;
 447                 }
 448
 449                 if (!ev.ShiftDown ()) {
 450                         cv->set_selected (view == *i);
 451                 }
 452         }
 453
 454         if (content_view && ev.ShiftDown ()) {
 455                 content_view->set_selected (!content_view->selected ());
 456         }
 457
 458         _first_move = false;
 459
 460         if (_down_view) {
 461                 /* Pre-compute the points that we might snap to */
 462                 for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 463                         shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 464                         if (!cv || cv == _down_view || cv->content() == _down_view->content()) {
 465                                 continue;
 466                         }
 467
 468                         _start_snaps.push_back (cv->content()->position());
 469                         _end_snaps.push_back (cv->content()->position());
 470                         _start_snaps.push_back (cv->content()->end());
 471                         _end_snaps.push_back (cv->content()->end());
 472
 473                         BOOST_FOREACH (DCPTime i, cv->content()->reel_split_points()) {
 474                                 _start_snaps.push_back (i);
 475                         }
 476                 }
 477
 478                 /* Tell everyone that things might change frequently during the drag */
 479                 _down_view->content()->set_change_signals_frequent (true);
 480         }
 481 }
 482
 483 void
 484 Timeline::left_up (wxMouseEvent& ev)
 485 {
 486         _left_down = false;
 487
 488         switch (_tool) {
 489         case SELECT:
 490                 left_up_select (ev);
 491                 break;
 492         case ZOOM:
 493                 left_up_zoom (ev);
 494                 break;
 495         }
 496 }
 497
 498 void
 499 Timeline::left_up_select (wxMouseEvent& ev)
 500 {
 501         if (_down_view) {
 502                 _down_view->content()->set_change_signals_frequent (false);
 503         }
 504
 505         _content_panel->set_selection (selected_content ());
 506         set_position_from_event (ev);
 507
 508         /* Clear up up the stuff we don't do during drag */
 509         assign_tracks ();
 510         setup_scrollbars ();
 511         Refresh ();
 512
 513         _start_snaps.clear ();
 514         _end_snaps.clear ();
 515 }
 516
 517 void
 518 Timeline::left_up_zoom (wxMouseEvent& ev)
 519 {
 520         _zoom_point = ev.GetPosition ();
 521
 522         int vsx, vsy;
 523         _main_canvas->GetViewStart (&vsx, &vsy);
 524
 525         wxPoint top_left(min(_down_point.x, _zoom_point->x), min(_down_point.y, _zoom_point->y));
 526         wxPoint bottom_right(max(_down_point.x, _zoom_point->x), max(_down_point.y, _zoom_point->y));
 527
 528         if ((bottom_right.x - top_left.x) < 8 || (bottom_right.y - top_left.y) < 8) {
 529                 /* Very small zoom rectangle: we assume it wasn't intentional */
 530                 return;
 531         }
 532
 533         DCPTime const time_left = DCPTime::from_seconds((top_left.x + vsx) / *_pixels_per_second);
 534         DCPTime const time_right = DCPTime::from_seconds((bottom_right.x + vsx) / *_pixels_per_second);
 535         _pixels_per_second = max (_minimum_pixels_per_second, double(GetSize().GetWidth()) / (time_right.seconds() - time_left.seconds()));
 536
 537         double const tracks_top = double(top_left.y) / _track_height;
 538         double const tracks_bottom = double(bottom_right.y) / _track_height;
 539         _track_height = max(_minimum_track_height, int(lrint(GetSize().GetHeight() / (tracks_bottom - tracks_top))));
 540
 541         setup_scrollbars ();
 542         _main_canvas->Scroll (time_left.seconds() * *_pixels_per_second / _x_scroll_rate, tracks_top * _track_height / _y_scroll_rate);
 543         _labels_canvas->Scroll (0, tracks_top * _track_height / _y_scroll_rate);
 544
 545         _zoom_point = optional<wxPoint> ();
 546         Refresh ();
 547 }
 548
 549 void
 550 Timeline::mouse_moved (wxMouseEvent& ev)
 551 {
 552         switch (_tool) {
 553         case SELECT:
 554                 mouse_moved_select (ev);
 555                 break;
 556         case ZOOM:
 557                 mouse_moved_zoom (ev);
 558                 break;
 559         }
 560 }
 561
 562 void
 563 Timeline::mouse_moved_select (wxMouseEvent& ev)
 564 {
 565         if (!_left_down) {
 566                 return;
 567         }
 568
 569         set_position_from_event (ev);
 570 }
 571
 572 void
 573 Timeline::mouse_moved_zoom (wxMouseEvent& ev)
 574 {
 575         if (!_left_down) {
 576                 return;
 577         }
 578
 579         _zoom_point = ev.GetPosition ();
 580         Refresh ();
 581 }
 582
 583 void
 584 Timeline::right_down (wxMouseEvent& ev)
 585 {
 586         switch (_tool) {
 587         case SELECT:
 588                 right_down_select (ev);
 589                 break;
 590         case ZOOM:
 591                 /* Zoom out */
 592                 _pixels_per_second = max (_minimum_pixels_per_second, *_pixels_per_second / 2);
 593                 _track_height = max (_minimum_track_height, _track_height / 2);
 594                 setup_scrollbars ();
 595                 Refresh ();
 596                 break;
 597         }
 598 }
 599
 600 void
 601 Timeline::right_down_select (wxMouseEvent& ev)
 602 {
 603         shared_ptr<TimelineView> view = event_to_view (ev);
 604         shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (view);
 605         if (!cv) {
 606                 return;
 607         }
 608
 609         if (!cv->selected ()) {
 610                 clear_selection ();
 611                 cv->set_selected (true);
 612         }
 613
 614         _menu.popup (_film, selected_content (), selected_views (), ev.GetPosition ());
 615 }
 616
 617 void
 618 Timeline::maybe_snap (DCPTime a, DCPTime b, optional<DCPTime>& nearest_distance) const
 619 {
 620         DCPTime const d = a - b;
 621         if (!nearest_distance || d.abs() < nearest_distance.get().abs()) {
 622                 nearest_distance = d;
 623         }
 624 }
 625
 626 void
 627 Timeline::set_position_from_event (wxMouseEvent& ev)
 628 {
 629         if (!_pixels_per_second) {
 630                 return;
 631         }
 632
 633         double const pps = _pixels_per_second.get ();
 634
 635         wxPoint const p = ev.GetPosition();
 636
 637         if (!_first_move) {
 638                 /* We haven't moved yet; in that case, we must move the mouse some reasonable distance
 639                    before the drag is considered to have started.
 640                 */
 641                 int const dist = sqrt (pow (p.x - _down_point.x, 2) + pow (p.y - _down_point.y, 2));
 642                 if (dist < 8) {
 643                         return;
 644                 }
 645                 _first_move = true;
 646         }
 647
 648         if (!_down_view) {
 649                 return;
 650         }
 651
 652         DCPTime new_position = _down_view_position + DCPTime::from_seconds ((p.x - _down_point.x) / pps);
 653
 654         if (_snap) {
 655
 656                 DCPTime const new_end = new_position + _down_view->content()->length_after_trim();
 657                 /* Signed `distance' to nearest thing (i.e. negative is left on the timeline,
 658                    positive is right).
 659                 */
 660                 optional<DCPTime> nearest_distance;
 661
 662                 /* Find the nearest snap point */
 663
 664                 BOOST_FOREACH (DCPTime i, _start_snaps) {
 665                         maybe_snap (i, new_position, nearest_distance);
 666                 }
 667
 668                 BOOST_FOREACH (DCPTime i, _end_snaps) {
 669                         maybe_snap (i, new_end, nearest_distance);
 670                 }
 671
 672                 if (nearest_distance) {
 673                         /* Snap if it's close; `close' means within a proportion of the time on the timeline */
 674                         if (nearest_distance.get().abs() < DCPTime::from_seconds ((width() / pps) / 64)) {
 675                                 new_position += nearest_distance.get ();
 676                         }
 677                 }
 678         }
 679
 680         if (new_position < DCPTime ()) {
 681                 new_position = DCPTime ();
 682         }
 683
 684         _down_view->content()->set_position (new_position);
 685
 686         shared_ptr<Film> film = _film.lock ();
 687         DCPOMATIC_ASSERT (film);
 688         film->set_sequence (false);
 689 }
 690
 691 void
 692 Timeline::force_redraw (dcpomatic::Rect<int> const & r)
 693 {
 694         RefreshRect (wxRect (r.x, r.y, r.width, r.height), false);
 695 }
 696
 697 shared_ptr<const Film>
 698 Timeline::film () const
 699 {
 700         return _film.lock ();
 701 }
 702
 703 void
 704 Timeline::resized ()
 705 {
 706         setup_scrollbars ();
 707 }
 708
 709 void
 710 Timeline::clear_selection ()
 711 {
 712         for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 713                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 714                 if (cv) {
 715                         cv->set_selected (false);
 716                 }
 717         }
 718 }
 719
 720 TimelineContentViewList
 721 Timeline::selected_views () const
 722 {
 723         TimelineContentViewList sel;
 724
 725         for (TimelineViewList::const_iterator i = _views.begin(); i != _views.end(); ++i) {
 726                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 727                 if (cv && cv->selected()) {
 728                         sel.push_back (cv);
 729                 }
 730         }
 731
 732         return sel;
 733 }
 734
 735 ContentList
 736 Timeline::selected_content () const
 737 {
 738         ContentList sel;
 739         TimelineContentViewList views = selected_views ();
 740
 741         for (TimelineContentViewList::const_iterator i = views.begin(); i != views.end(); ++i) {
 742                 sel.push_back ((*i)->content ());
 743         }
 744
 745         return sel;
 746 }
 747
 748 void
 749 Timeline::set_selection (ContentList selection)
 750 {
 751         for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 752                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 753                 if (cv) {
 754                         cv->set_selected (find (selection.begin(), selection.end(), cv->content ()) != selection.end ());
 755                 }
 756         }
 757 }
 758
 759 int
 760 Timeline::tracks_y_offset () const
 761 {
 762         return _reels_view->bbox().height + 4;
 763 }
 764
 765 int
 766 Timeline::width () const
 767 {
 768         return _main_canvas->GetVirtualSize().GetWidth();
 769 }
 770
 771 void
 772 Timeline::scrolled (wxScrollWinEvent& ev)
 773 {
 774         if (ev.GetOrientation() == wxVERTICAL) {
 775                 _labels_canvas->Scroll (0, ev.GetPosition ());
 776         }
 777         ev.Skip ();
 778 }