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_pixels_per_track = 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         , _pixels_per_track (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 * pixels_per_track() + 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         set_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::set_pixels_per_second (double pps)
 115 {
 116         _pixels_per_second = max (_minimum_pixels_per_second, pps);
 117 }
 118
 119 void
 120 Timeline::paint_labels ()
 121 {
 122         wxPaintDC dc (_labels_canvas);
 123
 124         wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
 125         if (!gc) {
 126                 return;
 127         }
 128
 129         int vsx, vsy;
 130         _labels_canvas->GetViewStart (&vsx, &vsy);
 131         gc->Translate (-vsx * _x_scroll_rate, -vsy * _y_scroll_rate + tracks_y_offset());
 132
 133         _labels_view->paint (gc, list<dcpomatic::Rect<int> >());
 134
 135         delete gc;
 136 }
 137
 138 void
 139 Timeline::paint_main ()
 140 {
 141         wxPaintDC dc (_main_canvas);
 142         _main_canvas->DoPrepareDC (dc);
 143
 144         wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
 145         if (!gc) {
 146                 return;
 147         }
 148
 149         int vsx, vsy;
 150         _main_canvas->GetViewStart (&vsx, &vsy);
 151         gc->Translate (-vsx * _x_scroll_rate, -vsy * _y_scroll_rate);
 152
 153         gc->SetAntialiasMode (wxANTIALIAS_DEFAULT);
 154
 155         BOOST_FOREACH (shared_ptr<TimelineView> i, _views) {
 156
 157                 shared_ptr<TimelineContentView> ic = dynamic_pointer_cast<TimelineContentView> (i);
 158
 159                 /* Find areas of overlap with other content views, so that we can plot them */
 160                 list<dcpomatic::Rect<int> > overlaps;
 161                 BOOST_FOREACH (shared_ptr<TimelineView> j, _views) {
 162                         shared_ptr<TimelineContentView> jc = dynamic_pointer_cast<TimelineContentView> (j);
 163                         /* No overlap with non-content views, views no different tracks, audio views or non-active views */
 164                         if (!ic || !jc || i == j || ic->track() != jc->track() || ic->track().get_value_or(2) >= 2 || !ic->active() || !jc->active()) {
 165                                 continue;
 166                         }
 167
 168                         optional<dcpomatic::Rect<int> > r = j->bbox().intersection (i->bbox());
 169                         if (r) {
 170                                 overlaps.push_back (r.get ());
 171                         }
 172                 }
 173
 174                 i->paint (gc, overlaps);
 175         }
 176
 177         if (_zoom_point) {
 178                 /* Translate back as _down_point and _zoom_point do not take scroll into account */
 179                 gc->Translate (vsx * _x_scroll_rate, vsy * _y_scroll_rate);
 180                 gc->SetPen (*wxBLACK_PEN);
 181                 gc->SetBrush (*wxTRANSPARENT_BRUSH);
 182                 gc->DrawRectangle (
 183                         min (_down_point.x, _zoom_point->x),
 184                         min (_down_point.y, _zoom_point->y),
 185                         fabs (_down_point.x - _zoom_point->x),
 186                         fabs (_down_point.y - _zoom_point->y)
 187                         );
 188         }
 189
 190         delete gc;
 191 }
 192
 193 void
 194 Timeline::film_changed (Film::Property p)
 195 {
 196         if (p == Film::CONTENT || p == Film::REEL_TYPE || p == Film::REEL_LENGTH) {
 197                 ensure_ui_thread ();
 198                 recreate_views ();
 199         } else if (p == Film::CONTENT_ORDER) {
 200                 Refresh ();
 201         }
 202 }
 203
 204 void
 205 Timeline::recreate_views ()
 206 {
 207         shared_ptr<const Film> film = _film.lock ();
 208         if (!film) {
 209                 return;
 210         }
 211
 212         _views.clear ();
 213         _views.push_back (_time_axis_view);
 214         _views.push_back (_reels_view);
 215
 216         BOOST_FOREACH (shared_ptr<Content> i, film->content ()) {
 217                 if (i->video) {
 218                         _views.push_back (shared_ptr<TimelineView> (new TimelineVideoContentView (*this, i)));
 219                 }
 220
 221                 if (i->audio && !i->audio->mapping().mapped_output_channels().empty ()) {
 222                         _views.push_back (shared_ptr<TimelineView> (new TimelineAudioContentView (*this, i)));
 223                 }
 224
 225                 if (i->subtitle) {
 226                         _views.push_back (shared_ptr<TimelineView> (new TimelineSubtitleContentView (*this, i)));
 227                 }
 228
 229                 if (dynamic_pointer_cast<AtmosMXFContent> (i)) {
 230                         _views.push_back (shared_ptr<TimelineView> (new TimelineAtmosContentView (*this, i)));
 231                 }
 232         }
 233
 234         assign_tracks ();
 235         setup_scrollbars ();
 236         Refresh ();
 237 }
 238
 239 void
 240 Timeline::film_content_changed (int property, bool frequent)
 241 {
 242         ensure_ui_thread ();
 243
 244         if (property == AudioContentProperty::STREAMS) {
 245                 recreate_views ();
 246         } else if (!frequent) {
 247                 setup_scrollbars ();
 248                 Refresh ();
 249         }
 250 }
 251
 252 template <class T>
 253 int
 254 place (TimelineViewList& views, int& tracks)
 255 {
 256         int const base = tracks;
 257
 258         BOOST_FOREACH (shared_ptr<TimelineView> i, views) {
 259                 if (!dynamic_pointer_cast<T>(i)) {
 260                         continue;
 261                 }
 262
 263                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (i);
 264
 265                 int t = base;
 266
 267                 shared_ptr<Content> content = cv->content();
 268                 DCPTimePeriod const content_period (content->position(), content->end());
 269
 270                 while (true) {
 271                         TimelineViewList::iterator j = views.begin();
 272                         while (j != views.end()) {
 273                                 shared_ptr<T> test = dynamic_pointer_cast<T> (*j);
 274                                 if (!test) {
 275                                         ++j;
 276                                         continue;
 277                                 }
 278
 279                                 shared_ptr<Content> test_content = test->content();
 280                                 if (
 281                                         test->track() && test->track().get() == t &&
 282                                         content_period.overlap(DCPTimePeriod(test_content->position(), test_content->end()))) {
 283                                         /* we have an overlap on track `t' */
 284                                         ++t;
 285                                         break;
 286                                 }
 287
 288                                 ++j;
 289                         }
 290
 291                         if (j == views.end ()) {
 292                                 /* no overlap on `t' */
 293                                 break;
 294                         }
 295                 }
 296
 297                 cv->set_track (t);
 298                 tracks = max (tracks, t + 1);
 299         }
 300
 301         return tracks - base;
 302 }
 303
 304 void
 305 Timeline::assign_tracks ()
 306 {
 307         /* Tracks are:
 308            Video (mono or left-eye)
 309            Video (right-eye)
 310            Subtitle 1
 311            Subtitle 2
 312            Subtitle N
 313            Atmos
 314            Audio 1
 315            Audio 2
 316            Audio N
 317         */
 318
 319         _tracks = 0;
 320
 321         for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 322                 shared_ptr<TimelineContentView> c = dynamic_pointer_cast<TimelineContentView> (*i);
 323                 if (c) {
 324                         c->unset_track ();
 325                 }
 326         }
 327
 328         /* Video */
 329
 330         bool have_3d = false;
 331         BOOST_FOREACH (shared_ptr<TimelineView> i, _views) {
 332                 shared_ptr<TimelineVideoContentView> cv = dynamic_pointer_cast<TimelineVideoContentView> (i);
 333                 if (!cv) {
 334                         continue;
 335                 }
 336
 337                 /* Video on tracks 0 and maybe 1 (left and right eye) */
 338                 if (cv->content()->video->frame_type() == VIDEO_FRAME_TYPE_3D_RIGHT) {
 339                         cv->set_track (1);
 340                         _tracks = max (_tracks, 2);
 341                         have_3d = true;
 342                 } else {
 343                         cv->set_track (0);
 344                 }
 345         }
 346
 347         _tracks = max (_tracks, 1);
 348
 349         /* Subtitle */
 350
 351         int const subtitle_tracks = place<TimelineSubtitleContentView> (_views, _tracks);
 352
 353         /* Atmos */
 354
 355         bool have_atmos = false;
 356         BOOST_FOREACH (shared_ptr<TimelineView> i, _views) {
 357                 shared_ptr<TimelineVideoContentView> cv = dynamic_pointer_cast<TimelineVideoContentView> (i);
 358                 if (!cv) {
 359                         continue;
 360                 }
 361                 if (dynamic_pointer_cast<TimelineAtmosContentView> (i)) {
 362                         cv->set_track (_tracks - 1);
 363                         have_atmos = true;
 364                 }
 365         }
 366
 367         if (have_atmos) {
 368                 ++_tracks;
 369         }
 370
 371         /* Audio */
 372
 373         place<TimelineAudioContentView> (_views, _tracks);
 374
 375         _labels_view->set_3d (have_3d);
 376         _labels_view->set_subtitle_tracks (subtitle_tracks);
 377         _labels_view->set_atmos (have_atmos);
 378
 379         _time_axis_view->set_y (tracks());
 380         _reels_view->set_y (8);
 381 }
 382
 383 int
 384 Timeline::tracks () const
 385 {
 386         return _tracks;
 387 }
 388
 389 void
 390 Timeline::setup_scrollbars ()
 391 {
 392         shared_ptr<const Film> film = _film.lock ();
 393         if (!film || !_pixels_per_second) {
 394                 return;
 395         }
 396         _labels_canvas->SetVirtualSize (_labels_view->bbox().width, tracks() * pixels_per_track() + 96);
 397         _labels_canvas->SetScrollRate (_x_scroll_rate, _y_scroll_rate);
 398         _main_canvas->SetVirtualSize (*_pixels_per_second * film->length().seconds(), tracks() * pixels_per_track() + 96);
 399         _main_canvas->SetScrollRate (_x_scroll_rate, _y_scroll_rate);
 400 }
 401
 402 shared_ptr<TimelineView>
 403 Timeline::event_to_view (wxMouseEvent& ev)
 404 {
 405         /* Search backwards through views so that we find the uppermost one first */
 406         TimelineViewList::reverse_iterator i = _views.rbegin();
 407         Position<int> const p (ev.GetX(), ev.GetY());
 408         while (i != _views.rend() && !(*i)->bbox().contains (p)) {
 409                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 410                 ++i;
 411         }
 412
 413         if (i == _views.rend ()) {
 414                 return shared_ptr<TimelineView> ();
 415         }
 416
 417         return *i;
 418 }
 419
 420 void
 421 Timeline::left_down (wxMouseEvent& ev)
 422 {
 423         _left_down = true;
 424         _down_point = ev.GetPosition ();
 425
 426         switch (_tool) {
 427         case SELECT:
 428                 left_down_select (ev);
 429                 break;
 430         case ZOOM:
 431         case ZOOM_ALL:
 432                 /* Nothing to do */
 433                 break;
 434         }
 435 }
 436
 437 void
 438 Timeline::left_down_select (wxMouseEvent& ev)
 439 {
 440         shared_ptr<TimelineView> view = event_to_view (ev);
 441         shared_ptr<TimelineContentView> content_view = dynamic_pointer_cast<TimelineContentView> (view);
 442
 443         _down_view.reset ();
 444
 445         if (content_view) {
 446                 _down_view = content_view;
 447                 _down_view_position = content_view->content()->position ();
 448         }
 449
 450         for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 451                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 452                 if (!cv) {
 453                         continue;
 454                 }
 455
 456                 if (!ev.ShiftDown ()) {
 457                         cv->set_selected (view == *i);
 458                 }
 459         }
 460
 461         if (content_view && ev.ShiftDown ()) {
 462                 content_view->set_selected (!content_view->selected ());
 463         }
 464
 465         _first_move = false;
 466
 467         if (_down_view) {
 468                 /* Pre-compute the points that we might snap to */
 469                 for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 470                         shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 471                         if (!cv || cv == _down_view || cv->content() == _down_view->content()) {
 472                                 continue;
 473                         }
 474
 475                         _start_snaps.push_back (cv->content()->position());
 476                         _end_snaps.push_back (cv->content()->position());
 477                         _start_snaps.push_back (cv->content()->end());
 478                         _end_snaps.push_back (cv->content()->end());
 479
 480                         BOOST_FOREACH (DCPTime i, cv->content()->reel_split_points()) {
 481                                 _start_snaps.push_back (i);
 482                         }
 483                 }
 484
 485                 /* Tell everyone that things might change frequently during the drag */
 486                 _down_view->content()->set_change_signals_frequent (true);
 487         }
 488 }
 489
 490 void
 491 Timeline::left_up (wxMouseEvent& ev)
 492 {
 493         _left_down = false;
 494
 495         switch (_tool) {
 496         case SELECT:
 497                 left_up_select (ev);
 498                 break;
 499         case ZOOM:
 500                 left_up_zoom (ev);
 501                 break;
 502         case ZOOM_ALL:
 503                 break;
 504         }
 505 }
 506
 507 void
 508 Timeline::left_up_select (wxMouseEvent& ev)
 509 {
 510         if (_down_view) {
 511                 _down_view->content()->set_change_signals_frequent (false);
 512         }
 513
 514         _content_panel->set_selection (selected_content ());
 515         set_position_from_event (ev);
 516
 517         /* Clear up up the stuff we don't do during drag */
 518         assign_tracks ();
 519         setup_scrollbars ();
 520         Refresh ();
 521
 522         _start_snaps.clear ();
 523         _end_snaps.clear ();
 524 }
 525
 526 void
 527 Timeline::left_up_zoom (wxMouseEvent& ev)
 528 {
 529         _zoom_point = ev.GetPosition ();
 530
 531         int vsx, vsy;
 532         _main_canvas->GetViewStart (&vsx, &vsy);
 533
 534         wxPoint top_left(min(_down_point.x, _zoom_point->x), min(_down_point.y, _zoom_point->y));
 535         wxPoint bottom_right(max(_down_point.x, _zoom_point->x), max(_down_point.y, _zoom_point->y));
 536
 537         if ((bottom_right.x - top_left.x) < 8 || (bottom_right.y - top_left.y) < 8) {
 538                 /* Very small zoom rectangle: we assume it wasn't intentional */
 539                 return;
 540         }
 541
 542         DCPTime const time_left = DCPTime::from_seconds((top_left.x + vsx) / *_pixels_per_second);
 543         DCPTime const time_right = DCPTime::from_seconds((bottom_right.x + vsx) / *_pixels_per_second);
 544         set_pixels_per_second (double(GetSize().GetWidth()) / (time_right.seconds() - time_left.seconds()));
 545
 546         double const tracks_top = double(top_left.y) / _pixels_per_track;
 547         double const tracks_bottom = double(bottom_right.y) / _pixels_per_track;
 548         set_pixels_per_track (lrint(GetSize().GetHeight() / (tracks_bottom - tracks_top)));
 549
 550         setup_scrollbars ();
 551         _main_canvas->Scroll (time_left.seconds() * *_pixels_per_second / _x_scroll_rate, tracks_top * _pixels_per_track / _y_scroll_rate);
 552         _labels_canvas->Scroll (0, tracks_top * _pixels_per_track / _y_scroll_rate);
 553
 554         _zoom_point = optional<wxPoint> ();
 555         Refresh ();
 556 }
 557
 558 void
 559 Timeline::set_pixels_per_track (int h)
 560 {
 561         _pixels_per_track = max(_minimum_pixels_per_track, h);
 562 }
 563
 564 void
 565 Timeline::mouse_moved (wxMouseEvent& ev)
 566 {
 567         switch (_tool) {
 568         case SELECT:
 569                 mouse_moved_select (ev);
 570                 break;
 571         case ZOOM:
 572                 mouse_moved_zoom (ev);
 573                 break;
 574         case ZOOM_ALL:
 575                 break;
 576         }
 577 }
 578
 579 void
 580 Timeline::mouse_moved_select (wxMouseEvent& ev)
 581 {
 582         if (!_left_down) {
 583                 return;
 584         }
 585
 586         set_position_from_event (ev);
 587 }
 588
 589 void
 590 Timeline::mouse_moved_zoom (wxMouseEvent& ev)
 591 {
 592         if (!_left_down) {
 593                 return;
 594         }
 595
 596         _zoom_point = ev.GetPosition ();
 597         Refresh ();
 598 }
 599
 600 void
 601 Timeline::right_down (wxMouseEvent& ev)
 602 {
 603         switch (_tool) {
 604         case SELECT:
 605                 right_down_select (ev);
 606                 break;
 607         case ZOOM:
 608                 /* Zoom out */
 609                 set_pixels_per_second (*_pixels_per_second / 2);
 610                 set_pixels_per_track (_pixels_per_track / 2);
 611                 setup_scrollbars ();
 612                 Refresh ();
 613                 break;
 614         case ZOOM_ALL:
 615                 break;
 616         }
 617 }
 618
 619 void
 620 Timeline::right_down_select (wxMouseEvent& ev)
 621 {
 622         shared_ptr<TimelineView> view = event_to_view (ev);
 623         shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (view);
 624         if (!cv) {
 625                 return;
 626         }
 627
 628         if (!cv->selected ()) {
 629                 clear_selection ();
 630                 cv->set_selected (true);
 631         }
 632
 633         _menu.popup (_film, selected_content (), selected_views (), ev.GetPosition ());
 634 }
 635
 636 void
 637 Timeline::maybe_snap (DCPTime a, DCPTime b, optional<DCPTime>& nearest_distance) const
 638 {
 639         DCPTime const d = a - b;
 640         if (!nearest_distance || d.abs() < nearest_distance.get().abs()) {
 641                 nearest_distance = d;
 642         }
 643 }
 644
 645 void
 646 Timeline::set_position_from_event (wxMouseEvent& ev)
 647 {
 648         if (!_pixels_per_second) {
 649                 return;
 650         }
 651
 652         double const pps = _pixels_per_second.get ();
 653
 654         wxPoint const p = ev.GetPosition();
 655
 656         if (!_first_move) {
 657                 /* We haven't moved yet; in that case, we must move the mouse some reasonable distance
 658                    before the drag is considered to have started.
 659                 */
 660                 int const dist = sqrt (pow (p.x - _down_point.x, 2) + pow (p.y - _down_point.y, 2));
 661                 if (dist < 8) {
 662                         return;
 663                 }
 664                 _first_move = true;
 665         }
 666
 667         if (!_down_view) {
 668                 return;
 669         }
 670
 671         DCPTime new_position = _down_view_position + DCPTime::from_seconds ((p.x - _down_point.x) / pps);
 672
 673         if (_snap) {
 674
 675                 DCPTime const new_end = new_position + _down_view->content()->length_after_trim();
 676                 /* Signed `distance' to nearest thing (i.e. negative is left on the timeline,
 677                    positive is right).
 678                 */
 679                 optional<DCPTime> nearest_distance;
 680
 681                 /* Find the nearest snap point */
 682
 683                 BOOST_FOREACH (DCPTime i, _start_snaps) {
 684                         maybe_snap (i, new_position, nearest_distance);
 685                 }
 686
 687                 BOOST_FOREACH (DCPTime i, _end_snaps) {
 688                         maybe_snap (i, new_end, nearest_distance);
 689                 }
 690
 691                 if (nearest_distance) {
 692                         /* Snap if it's close; `close' means within a proportion of the time on the timeline */
 693                         if (nearest_distance.get().abs() < DCPTime::from_seconds ((width() / pps) / 64)) {
 694                                 new_position += nearest_distance.get ();
 695                         }
 696                 }
 697         }
 698
 699         if (new_position < DCPTime ()) {
 700                 new_position = DCPTime ();
 701         }
 702
 703         _down_view->content()->set_position (new_position);
 704
 705         shared_ptr<Film> film = _film.lock ();
 706         DCPOMATIC_ASSERT (film);
 707         film->set_sequence (false);
 708 }
 709
 710 void
 711 Timeline::force_redraw (dcpomatic::Rect<int> const & r)
 712 {
 713         RefreshRect (wxRect (r.x, r.y, r.width, r.height), false);
 714 }
 715
 716 shared_ptr<const Film>
 717 Timeline::film () const
 718 {
 719         return _film.lock ();
 720 }
 721
 722 void
 723 Timeline::resized ()
 724 {
 725         setup_scrollbars ();
 726 }
 727
 728 void
 729 Timeline::clear_selection ()
 730 {
 731         for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 732                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 733                 if (cv) {
 734                         cv->set_selected (false);
 735                 }
 736         }
 737 }
 738
 739 TimelineContentViewList
 740 Timeline::selected_views () const
 741 {
 742         TimelineContentViewList sel;
 743
 744         for (TimelineViewList::const_iterator i = _views.begin(); i != _views.end(); ++i) {
 745                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 746                 if (cv && cv->selected()) {
 747                         sel.push_back (cv);
 748                 }
 749         }
 750
 751         return sel;
 752 }
 753
 754 ContentList
 755 Timeline::selected_content () const
 756 {
 757         ContentList sel;
 758         TimelineContentViewList views = selected_views ();
 759
 760         for (TimelineContentViewList::const_iterator i = views.begin(); i != views.end(); ++i) {
 761                 sel.push_back ((*i)->content ());
 762         }
 763
 764         return sel;
 765 }
 766
 767 void
 768 Timeline::set_selection (ContentList selection)
 769 {
 770         for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 771                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 772                 if (cv) {
 773                         cv->set_selected (find (selection.begin(), selection.end(), cv->content ()) != selection.end ());
 774                 }
 775         }
 776 }
 777
 778 int
 779 Timeline::tracks_y_offset () const
 780 {
 781         return _reels_view->bbox().height + 4;
 782 }
 783
 784 int
 785 Timeline::width () const
 786 {
 787         return _main_canvas->GetVirtualSize().GetWidth();
 788 }
 789
 790 void
 791 Timeline::scrolled (wxScrollWinEvent& ev)
 792 {
 793         if (ev.GetOrientation() == wxVERTICAL) {
 794                 _labels_canvas->Scroll (0, ev.GetPosition ());
 795         }
 796         ev.Skip ();
 797 }
 798
 799 void
 800 Timeline::tool_clicked (Tool t)
 801 {
 802         switch (t) {
 803         case ZOOM:
 804         case SELECT:
 805                 _tool = t;
 806                 break;
 807         case ZOOM_ALL:
 808                 shared_ptr<Film> film = _film.lock ();
 809                 DCPOMATIC_ASSERT (film);
 810                 set_pixels_per_second ((_main_canvas->GetSize().GetWidth() - 32) / film->length().seconds());
 811                 set_pixels_per_track ((_main_canvas->GetSize().GetHeight() - tracks_y_offset() - _time_axis_view->bbox().height - 32) / _tracks);
 812                 Refresh ();
 813                 break;
 814         }
 815 }