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_text_content_view.h"
  29 #include "timeline_atmos_content_view.h"
  30 #include "content_panel.h"
  31 #include "wx_util.h"
  32 #include "film_viewer.h"
  33 #include "lib/film.h"
  34 #include "lib/playlist.h"
  35 #include "lib/image_content.h"
  36 #include "lib/timer.h"
  37 #include "lib/audio_content.h"
  38 #include "lib/text_content.h"
  39 #include "lib/video_content.h"
  40 #include "lib/atmos_mxf_content.h"
  41 #include <wx/graphics.h>
  42 #include <list>
  43 #include <iterator>
  44 #include <iostream>
  45
  46 using std::list;
  47 using std::cout;
  48 using std::min;
  49 using std::max;
  50 using std::abs;
  51 using std::shared_ptr;
  52 using std::weak_ptr;
  53 using std::dynamic_pointer_cast;
  54 using boost::bind;
  55 using boost::optional;
  56 using namespace dcpomatic;
  57 #if BOOST_VERSION >= 106100
  58 using namespace boost::placeholders;
  59 #endif
  60
  61 /* 3 hours in 640 pixels */
  62 double const Timeline::_minimum_pixels_per_second = 640.0 / (60 * 60 * 3);
  63 int const Timeline::_minimum_pixels_per_track = 16;
  64
  65 Timeline::Timeline (wxWindow* parent, ContentPanel* cp, shared_ptr<Film> film, weak_ptr<FilmViewer> viewer)
  66         : wxPanel (parent, wxID_ANY)
  67         , _labels_canvas (new wxScrolledCanvas (this, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE))
  68         , _main_canvas (new wxScrolledCanvas (this, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxFULL_REPAINT_ON_RESIZE))
  69         , _content_panel (cp)
  70         , _film (film)
  71         , _viewer (viewer)
  72         , _time_axis_view (new TimelineTimeAxisView (*this, 64))
  73         , _reels_view (new TimelineReelsView (*this, 32))
  74         , _labels_view (new TimelineLabelsView (*this))
  75         , _tracks (0)
  76         , _left_down (false)
  77         , _down_view_position (0)
  78         , _first_move (false)
  79         , _menu (this)
  80         , _snap (true)
  81         , _tool (SELECT)
  82         , _x_scroll_rate (16)
  83         , _y_scroll_rate (16)
  84         , _pixels_per_track (48)
  85         , _first_resize (true)
  86         , _timer (this)
  87 {
  88 #ifndef __WXOSX__
  89         _labels_canvas->SetDoubleBuffered (true);
  90         _main_canvas->SetDoubleBuffered (true);
  91 #endif
  92
  93         wxSizer* sizer = new wxBoxSizer (wxHORIZONTAL);
  94         sizer->Add (_labels_canvas, 0, wxEXPAND);
  95         _labels_canvas->SetMinSize (wxSize (_labels_view->bbox().width, -1));
  96         sizer->Add (_main_canvas, 1, wxEXPAND);
  97         SetSizer (sizer);
  98
  99         _labels_canvas->Bind (wxEVT_PAINT,      boost::bind (&Timeline::paint_labels, this));
 100         _main_canvas->Bind   (wxEVT_PAINT,      boost::bind (&Timeline::paint_main,   this));
 101         _main_canvas->Bind   (wxEVT_LEFT_DOWN,  boost::bind (&Timeline::left_down,    this, _1));
 102         _main_canvas->Bind   (wxEVT_LEFT_UP,    boost::bind (&Timeline::left_up,      this, _1));
 103         _main_canvas->Bind   (wxEVT_RIGHT_DOWN, boost::bind (&Timeline::right_down,   this, _1));
 104         _main_canvas->Bind   (wxEVT_MOTION,     boost::bind (&Timeline::mouse_moved,  this, _1));
 105         _main_canvas->Bind   (wxEVT_SIZE,       boost::bind (&Timeline::resized,      this));
 106         _main_canvas->Bind   (wxEVT_SCROLLWIN_TOP,        boost::bind (&Timeline::scrolled,     this, _1));
 107         _main_canvas->Bind   (wxEVT_SCROLLWIN_BOTTOM,     boost::bind (&Timeline::scrolled,     this, _1));
 108         _main_canvas->Bind   (wxEVT_SCROLLWIN_LINEUP,     boost::bind (&Timeline::scrolled,     this, _1));
 109         _main_canvas->Bind   (wxEVT_SCROLLWIN_LINEDOWN,   boost::bind (&Timeline::scrolled,     this, _1));
 110         _main_canvas->Bind   (wxEVT_SCROLLWIN_PAGEUP,     boost::bind (&Timeline::scrolled,     this, _1));
 111         _main_canvas->Bind   (wxEVT_SCROLLWIN_PAGEDOWN,   boost::bind (&Timeline::scrolled,     this, _1));
 112         _main_canvas->Bind   (wxEVT_SCROLLWIN_THUMBTRACK, boost::bind (&Timeline::scrolled,     this, _1));
 113
 114         film_change (CHANGE_TYPE_DONE, Film::CONTENT);
 115
 116         SetMinSize (wxSize (640, 4 * pixels_per_track() + 96));
 117
 118         _film_changed_connection = film->Change.connect (bind (&Timeline::film_change, this, _1, _2));
 119         _film_content_change_connection = film->ContentChange.connect (bind (&Timeline::film_content_change, this, _1, _3, _4));
 120
 121         Bind (wxEVT_TIMER, boost::bind(&Timeline::update_playhead, this));
 122         _timer.Start (200, wxTIMER_CONTINUOUS);
 123
 124         setup_scrollbars ();
 125         _labels_canvas->ShowScrollbars (wxSHOW_SB_NEVER, wxSHOW_SB_NEVER);
 126 }
 127
 128 void
 129 Timeline::update_playhead ()
 130 {
 131         Refresh ();
 132 }
 133
 134 void
 135 Timeline::set_pixels_per_second (double pps)
 136 {
 137         _pixels_per_second = max (_minimum_pixels_per_second, pps);
 138 }
 139
 140 void
 141 Timeline::paint_labels ()
 142 {
 143         wxPaintDC dc (_labels_canvas);
 144
 145         wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
 146         if (!gc) {
 147                 return;
 148         }
 149
 150         int vsx, vsy;
 151         _labels_canvas->GetViewStart (&vsx, &vsy);
 152         gc->Translate (-vsx * _x_scroll_rate, -vsy * _y_scroll_rate + tracks_y_offset());
 153
 154         _labels_view->paint (gc, list<dcpomatic::Rect<int> >());
 155
 156         delete gc;
 157 }
 158
 159 void
 160 Timeline::paint_main ()
 161 {
 162         wxPaintDC dc (_main_canvas);
 163         _main_canvas->DoPrepareDC (dc);
 164
 165         wxGraphicsContext* gc = wxGraphicsContext::Create (dc);
 166         if (!gc) {
 167                 return;
 168         }
 169
 170         int vsx, vsy;
 171         _main_canvas->GetViewStart (&vsx, &vsy);
 172         gc->Translate (-vsx * _x_scroll_rate, -vsy * _y_scroll_rate);
 173
 174         gc->SetAntialiasMode (wxANTIALIAS_DEFAULT);
 175
 176         for (auto i: _views) {
 177
 178                 shared_ptr<TimelineContentView> ic = dynamic_pointer_cast<TimelineContentView> (i);
 179
 180                 /* Find areas of overlap with other content views, so that we can plot them */
 181                 list<dcpomatic::Rect<int> > overlaps;
 182                 for (auto j: _views) {
 183                         shared_ptr<TimelineContentView> jc = dynamic_pointer_cast<TimelineContentView> (j);
 184                         /* No overlap with non-content views, views no different tracks, audio views or non-active views */
 185                         if (!ic || !jc || i == j || ic->track() != jc->track() || ic->track().get_value_or(2) >= 2 || !ic->active() || !jc->active()) {
 186                                 continue;
 187                         }
 188
 189                         optional<dcpomatic::Rect<int> > r = j->bbox().intersection (i->bbox());
 190                         if (r) {
 191                                 overlaps.push_back (r.get ());
 192                         }
 193                 }
 194
 195                 i->paint (gc, overlaps);
 196         }
 197
 198         if (_zoom_point) {
 199                 /* Translate back as _down_point and _zoom_point do not take scroll into account */
 200                 gc->Translate (vsx * _x_scroll_rate, vsy * _y_scroll_rate);
 201                 gc->SetPen (*wxBLACK_PEN);
 202                 gc->SetBrush (*wxTRANSPARENT_BRUSH);
 203                 gc->DrawRectangle (
 204                         min (_down_point.x, _zoom_point->x),
 205                         min (_down_point.y, _zoom_point->y),
 206                         abs (_down_point.x - _zoom_point->x),
 207                         abs (_down_point.y - _zoom_point->y)
 208                         );
 209         }
 210
 211         /* Playhead */
 212
 213         shared_ptr<FilmViewer> vp = _viewer.lock ();
 214         DCPOMATIC_ASSERT (vp);
 215
 216         gc->SetPen (*wxRED_PEN);
 217         wxGraphicsPath path = gc->CreatePath ();
 218         double const ph = vp->position().seconds() * pixels_per_second().get_value_or(0);
 219         path.MoveToPoint (ph, 0);
 220         path.AddLineToPoint (ph, pixels_per_track() * _tracks + 32);
 221         gc->StrokePath (path);
 222
 223         delete gc;
 224 }
 225
 226 void
 227 Timeline::film_change (ChangeType type, Film::Property p)
 228 {
 229         if (type != CHANGE_TYPE_DONE) {
 230                 return;
 231         }
 232
 233         if (p == Film::CONTENT || p == Film::REEL_TYPE || p == Film::REEL_LENGTH) {
 234                 ensure_ui_thread ();
 235                 recreate_views ();
 236         } else if (p == Film::CONTENT_ORDER) {
 237                 Refresh ();
 238         }
 239 }
 240
 241 void
 242 Timeline::recreate_views ()
 243 {
 244         shared_ptr<const Film> film = _film.lock ();
 245         if (!film) {
 246                 return;
 247         }
 248
 249         _views.clear ();
 250         _views.push_back (_time_axis_view);
 251         _views.push_back (_reels_view);
 252
 253         for (auto i: film->content ()) {
 254                 if (i->video) {
 255                         _views.push_back (shared_ptr<TimelineView> (new TimelineVideoContentView (*this, i)));
 256                 }
 257
 258                 if (i->audio && !i->audio->mapping().mapped_output_channels().empty ()) {
 259                         _views.push_back (shared_ptr<TimelineView> (new TimelineAudioContentView (*this, i)));
 260                 }
 261
 262                 for (auto j: i->text) {
 263                         _views.push_back (shared_ptr<TimelineView> (new TimelineTextContentView (*this, i, j)));
 264                 }
 265
 266                 if (i->atmos) {
 267                         _views.push_back (shared_ptr<TimelineView>(new TimelineAtmosContentView(*this, i)));
 268                 }
 269         }
 270
 271         assign_tracks ();
 272         setup_scrollbars ();
 273         Refresh ();
 274 }
 275
 276 void
 277 Timeline::film_content_change (ChangeType type, int property, bool frequent)
 278 {
 279         if (type != CHANGE_TYPE_DONE) {
 280                 return;
 281         }
 282
 283         ensure_ui_thread ();
 284
 285         if (property == AudioContentProperty::STREAMS || property == VideoContentProperty::FRAME_TYPE) {
 286                 recreate_views ();
 287         } else if (property == ContentProperty::POSITION || property == ContentProperty::LENGTH) {
 288                 _reels_view->force_redraw ();
 289         } else if (!frequent) {
 290                 setup_scrollbars ();
 291                 Refresh ();
 292         }
 293 }
 294
 295 template <class T>
 296 int
 297 place (shared_ptr<const Film> film, TimelineViewList& views, int& tracks)
 298 {
 299         int const base = tracks;
 300
 301         for (auto i: views) {
 302                 if (!dynamic_pointer_cast<T>(i)) {
 303                         continue;
 304                 }
 305
 306                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (i);
 307
 308                 int t = base;
 309
 310                 shared_ptr<Content> content = cv->content();
 311                 DCPTimePeriod const content_period (content->position(), content->end(film));
 312
 313                 while (true) {
 314                         TimelineViewList::iterator j = views.begin();
 315                         while (j != views.end()) {
 316                                 shared_ptr<T> test = dynamic_pointer_cast<T> (*j);
 317                                 if (!test) {
 318                                         ++j;
 319                                         continue;
 320                                 }
 321
 322                                 shared_ptr<Content> test_content = test->content();
 323                                 if (
 324                                         test->track() && test->track().get() == t &&
 325                                         content_period.overlap(DCPTimePeriod(test_content->position(), test_content->end(film)))) {
 326                                         /* we have an overlap on track `t' */
 327                                         ++t;
 328                                         break;
 329                                 }
 330
 331                                 ++j;
 332                         }
 333
 334                         if (j == views.end ()) {
 335                                 /* no overlap on `t' */
 336                                 break;
 337                         }
 338                 }
 339
 340                 cv->set_track (t);
 341                 tracks = max (tracks, t + 1);
 342         }
 343
 344         return tracks - base;
 345 }
 346
 347 /** Compare the mapped output channels of two TimelineViews, so we can into
 348  *  order of first mapped DCP channel.
 349  */
 350 struct AudioMappingComparator {
 351         bool operator()(shared_ptr<TimelineView> a, shared_ptr<TimelineView> b) {
 352                 int la = -1;
 353                 shared_ptr<TimelineAudioContentView> cva = dynamic_pointer_cast<TimelineAudioContentView>(a);
 354                 if (cva) {
 355                         list<int> oc = cva->content()->audio->mapping().mapped_output_channels();
 356                         la = *min_element(boost::begin(oc), boost::end(oc));
 357                 }
 358                 int lb = -1;
 359                 shared_ptr<TimelineAudioContentView> cvb = dynamic_pointer_cast<TimelineAudioContentView>(b);
 360                 if (cvb) {
 361                         list<int> oc = cvb->content()->audio->mapping().mapped_output_channels();
 362                         lb = *min_element(boost::begin(oc), boost::end(oc));
 363                 }
 364                 return la < lb;
 365         }
 366 };
 367
 368 void
 369 Timeline::assign_tracks ()
 370 {
 371         /* Tracks are:
 372            Video (mono or left-eye)
 373            Video (right-eye)
 374            Text 1
 375            Text 2
 376            Text N
 377            Atmos
 378            Audio 1
 379            Audio 2
 380            Audio N
 381         */
 382
 383         shared_ptr<const Film> film = _film.lock ();
 384         DCPOMATIC_ASSERT (film);
 385
 386         _tracks = 0;
 387
 388         for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 389                 shared_ptr<TimelineContentView> c = dynamic_pointer_cast<TimelineContentView> (*i);
 390                 if (c) {
 391                         c->unset_track ();
 392                 }
 393         }
 394
 395         /* Video */
 396
 397         bool have_3d = false;
 398         for (auto i: _views) {
 399                 shared_ptr<TimelineVideoContentView> cv = dynamic_pointer_cast<TimelineVideoContentView> (i);
 400                 if (!cv) {
 401                         continue;
 402                 }
 403
 404                 /* Video on tracks 0 and maybe 1 (left and right eye) */
 405                 if (cv->content()->video->frame_type() == VIDEO_FRAME_TYPE_3D_RIGHT) {
 406                         cv->set_track (1);
 407                         _tracks = max (_tracks, 2);
 408                         have_3d = true;
 409                 } else {
 410                         cv->set_track (0);
 411                 }
 412         }
 413
 414         _tracks = max (_tracks, 1);
 415
 416         /* Texts */
 417
 418         int const text_tracks = place<TimelineTextContentView> (film, _views, _tracks);
 419
 420         /* Atmos */
 421
 422         bool have_atmos = false;
 423         for (auto i: _views) {
 424                 shared_ptr<TimelineAtmosContentView> cv = dynamic_pointer_cast<TimelineAtmosContentView>(i);
 425                 if (cv) {
 426                         cv->set_track (_tracks);
 427                         have_atmos = true;
 428                 }
 429         }
 430
 431         if (have_atmos) {
 432                 ++_tracks;
 433         }
 434
 435         /* Audio.  We're sorting the views so that we get the audio views in order of increasing
 436            DCP channel index.
 437         */
 438
 439         TimelineViewList views = _views;
 440         sort(views.begin(), views.end(), AudioMappingComparator());
 441         int const audio_tracks = place<TimelineAudioContentView> (film, views, _tracks);
 442
 443         _labels_view->set_3d (have_3d);
 444         _labels_view->set_audio_tracks (audio_tracks);
 445         _labels_view->set_text_tracks (text_tracks);
 446         _labels_view->set_atmos (have_atmos);
 447
 448         _time_axis_view->set_y (tracks());
 449         _reels_view->set_y (8);
 450 }
 451
 452 int
 453 Timeline::tracks () const
 454 {
 455         return _tracks;
 456 }
 457
 458 void
 459 Timeline::setup_scrollbars ()
 460 {
 461         shared_ptr<const Film> film = _film.lock ();
 462         if (!film || !_pixels_per_second) {
 463                 return;
 464         }
 465
 466         int const h = tracks() * pixels_per_track() + tracks_y_offset() + _time_axis_view->bbox().height;
 467
 468         _labels_canvas->SetVirtualSize (_labels_view->bbox().width, h);
 469         _labels_canvas->SetScrollRate (_x_scroll_rate, _y_scroll_rate);
 470         _main_canvas->SetVirtualSize (*_pixels_per_second * film->length().seconds(), h);
 471         _main_canvas->SetScrollRate (_x_scroll_rate, _y_scroll_rate);
 472 }
 473
 474 shared_ptr<TimelineView>
 475 Timeline::event_to_view (wxMouseEvent& ev)
 476 {
 477         /* Search backwards through views so that we find the uppermost one first */
 478         TimelineViewList::reverse_iterator i = _views.rbegin();
 479
 480         int vsx, vsy;
 481         _main_canvas->GetViewStart (&vsx, &vsy);
 482         Position<int> const p (ev.GetX() + vsx * _x_scroll_rate, ev.GetY() + vsy * _y_scroll_rate);
 483
 484         while (i != _views.rend() && !(*i)->bbox().contains (p)) {
 485                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 486                 ++i;
 487         }
 488
 489         if (i == _views.rend ()) {
 490                 return shared_ptr<TimelineView> ();
 491         }
 492
 493         return *i;
 494 }
 495
 496 void
 497 Timeline::left_down (wxMouseEvent& ev)
 498 {
 499         _left_down = true;
 500         _down_point = ev.GetPosition ();
 501
 502         switch (_tool) {
 503         case SELECT:
 504                 left_down_select (ev);
 505                 break;
 506         case ZOOM:
 507         case ZOOM_ALL:
 508         case SNAP:
 509         case SEQUENCE:
 510                 /* Nothing to do */
 511                 break;
 512         }
 513 }
 514
 515 void
 516 Timeline::left_down_select (wxMouseEvent& ev)
 517 {
 518         shared_ptr<TimelineView> view = event_to_view (ev);
 519         shared_ptr<TimelineContentView> content_view = dynamic_pointer_cast<TimelineContentView> (view);
 520
 521         _down_view.reset ();
 522
 523         if (content_view) {
 524                 _down_view = content_view;
 525                 _down_view_position = content_view->content()->position ();
 526         }
 527
 528         for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 529                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 530                 if (!cv) {
 531                         continue;
 532                 }
 533
 534                 if (!ev.ShiftDown ()) {
 535                         cv->set_selected (view == *i);
 536                 }
 537         }
 538
 539         if (content_view && ev.ShiftDown ()) {
 540                 content_view->set_selected (!content_view->selected ());
 541         }
 542
 543         _first_move = false;
 544
 545         if (_down_view) {
 546                 /* Pre-compute the points that we might snap to */
 547                 for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 548                         shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 549                         if (!cv || cv == _down_view || cv->content() == _down_view->content()) {
 550                                 continue;
 551                         }
 552
 553                         shared_ptr<Film> film = _film.lock ();
 554                         DCPOMATIC_ASSERT (film);
 555
 556                         _start_snaps.push_back (cv->content()->position());
 557                         _end_snaps.push_back (cv->content()->position());
 558                         _start_snaps.push_back (cv->content()->end(film));
 559                         _end_snaps.push_back (cv->content()->end(film));
 560
 561                         for (auto i: cv->content()->reel_split_points(film)) {
 562                                 _start_snaps.push_back (i);
 563                         }
 564                 }
 565
 566                 /* Tell everyone that things might change frequently during the drag */
 567                 _down_view->content()->set_change_signals_frequent (true);
 568         }
 569 }
 570
 571 void
 572 Timeline::left_up (wxMouseEvent& ev)
 573 {
 574         _left_down = false;
 575
 576         switch (_tool) {
 577         case SELECT:
 578                 left_up_select (ev);
 579                 break;
 580         case ZOOM:
 581                 left_up_zoom (ev);
 582                 break;
 583         case ZOOM_ALL:
 584         case SNAP:
 585         case SEQUENCE:
 586                 break;
 587         }
 588 }
 589
 590 void
 591 Timeline::left_up_select (wxMouseEvent& ev)
 592 {
 593         if (_down_view) {
 594                 _down_view->content()->set_change_signals_frequent (false);
 595         }
 596
 597         _content_panel->set_selection (selected_content ());
 598         /* Since we may have just set change signals back to `not-frequent', we have to
 599            make sure this position change is signalled, even if the position value has
 600            not changed since the last time it was set (with frequent=true).  This is
 601            a bit of a hack.
 602         */
 603         set_position_from_event (ev, true);
 604
 605         /* Clear up up the stuff we don't do during drag */
 606         assign_tracks ();
 607         setup_scrollbars ();
 608         Refresh ();
 609
 610         _start_snaps.clear ();
 611         _end_snaps.clear ();
 612 }
 613
 614 void
 615 Timeline::left_up_zoom (wxMouseEvent& ev)
 616 {
 617         _zoom_point = ev.GetPosition ();
 618
 619         int vsx, vsy;
 620         _main_canvas->GetViewStart (&vsx, &vsy);
 621
 622         wxPoint top_left(min(_down_point.x, _zoom_point->x), min(_down_point.y, _zoom_point->y));
 623         wxPoint bottom_right(max(_down_point.x, _zoom_point->x), max(_down_point.y, _zoom_point->y));
 624
 625         if ((bottom_right.x - top_left.x) < 8 || (bottom_right.y - top_left.y) < 8) {
 626                 /* Very small zoom rectangle: we assume it wasn't intentional */
 627                 return;
 628         }
 629
 630         DCPTime const time_left = DCPTime::from_seconds((top_left.x + vsx) / *_pixels_per_second);
 631         DCPTime const time_right = DCPTime::from_seconds((bottom_right.x + vsx) / *_pixels_per_second);
 632         set_pixels_per_second (double(GetSize().GetWidth()) / (time_right.seconds() - time_left.seconds()));
 633
 634         double const tracks_top = double(top_left.y - tracks_y_offset()) / _pixels_per_track;
 635         double const tracks_bottom = double(bottom_right.y - tracks_y_offset()) / _pixels_per_track;
 636         set_pixels_per_track (lrint(GetSize().GetHeight() / (tracks_bottom - tracks_top)));
 637
 638         setup_scrollbars ();
 639         int const y = (tracks_top * _pixels_per_track + tracks_y_offset()) / _y_scroll_rate;
 640         _main_canvas->Scroll (time_left.seconds() * *_pixels_per_second / _x_scroll_rate, y);
 641         _labels_canvas->Scroll (0, y);
 642
 643         _zoom_point = optional<wxPoint> ();
 644         Refresh ();
 645 }
 646
 647 void
 648 Timeline::set_pixels_per_track (int h)
 649 {
 650         _pixels_per_track = max(_minimum_pixels_per_track, h);
 651 }
 652
 653 void
 654 Timeline::mouse_moved (wxMouseEvent& ev)
 655 {
 656         switch (_tool) {
 657         case SELECT:
 658                 mouse_moved_select (ev);
 659                 break;
 660         case ZOOM:
 661                 mouse_moved_zoom (ev);
 662                 break;
 663         case ZOOM_ALL:
 664         case SNAP:
 665         case SEQUENCE:
 666                 break;
 667         }
 668 }
 669
 670 void
 671 Timeline::mouse_moved_select (wxMouseEvent& ev)
 672 {
 673         if (!_left_down) {
 674                 return;
 675         }
 676
 677         set_position_from_event (ev);
 678 }
 679
 680 void
 681 Timeline::mouse_moved_zoom (wxMouseEvent& ev)
 682 {
 683         if (!_left_down) {
 684                 return;
 685         }
 686
 687         _zoom_point = ev.GetPosition ();
 688         Refresh ();
 689 }
 690
 691 void
 692 Timeline::right_down (wxMouseEvent& ev)
 693 {
 694         switch (_tool) {
 695         case SELECT:
 696                 right_down_select (ev);
 697                 break;
 698         case ZOOM:
 699                 /* Zoom out */
 700                 set_pixels_per_second (*_pixels_per_second / 2);
 701                 set_pixels_per_track (_pixels_per_track / 2);
 702                 setup_scrollbars ();
 703                 Refresh ();
 704                 break;
 705         case ZOOM_ALL:
 706         case SNAP:
 707         case SEQUENCE:
 708                 break;
 709         }
 710 }
 711
 712 void
 713 Timeline::right_down_select (wxMouseEvent& ev)
 714 {
 715         shared_ptr<TimelineView> view = event_to_view (ev);
 716         shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (view);
 717         if (!cv) {
 718                 return;
 719         }
 720
 721         if (!cv->selected ()) {
 722                 clear_selection ();
 723                 cv->set_selected (true);
 724         }
 725
 726         _menu.popup (_film, selected_content (), selected_views (), ev.GetPosition ());
 727 }
 728
 729 void
 730 Timeline::maybe_snap (DCPTime a, DCPTime b, optional<DCPTime>& nearest_distance) const
 731 {
 732         DCPTime const d = a - b;
 733         if (!nearest_distance || d.abs() < nearest_distance.get().abs()) {
 734                 nearest_distance = d;
 735         }
 736 }
 737
 738 void
 739 Timeline::set_position_from_event (wxMouseEvent& ev, bool force_emit)
 740 {
 741         if (!_pixels_per_second) {
 742                 return;
 743         }
 744
 745         double const pps = _pixels_per_second.get ();
 746
 747         wxPoint const p = ev.GetPosition();
 748
 749         if (!_first_move) {
 750                 /* We haven't moved yet; in that case, we must move the mouse some reasonable distance
 751                    before the drag is considered to have started.
 752                 */
 753                 int const dist = sqrt (pow (p.x - _down_point.x, 2) + pow (p.y - _down_point.y, 2));
 754                 if (dist < 8) {
 755                         return;
 756                 }
 757                 _first_move = true;
 758         }
 759
 760         if (!_down_view) {
 761                 return;
 762         }
 763
 764         DCPTime new_position = _down_view_position + DCPTime::from_seconds ((p.x - _down_point.x) / pps);
 765
 766         shared_ptr<Film> film = _film.lock ();
 767         DCPOMATIC_ASSERT (film);
 768
 769         if (_snap) {
 770                 DCPTime const new_end = new_position + _down_view->content()->length_after_trim(film);
 771                 /* Signed `distance' to nearest thing (i.e. negative is left on the timeline,
 772                    positive is right).
 773                 */
 774                 optional<DCPTime> nearest_distance;
 775
 776                 /* Find the nearest snap point */
 777
 778                 for (auto i: _start_snaps) {
 779                         maybe_snap (i, new_position, nearest_distance);
 780                 }
 781
 782                 for (auto i: _end_snaps) {
 783                         maybe_snap (i, new_end, nearest_distance);
 784                 }
 785
 786                 if (nearest_distance) {
 787                         /* Snap if it's close; `close' means within a proportion of the time on the timeline */
 788                         if (nearest_distance.get().abs() < DCPTime::from_seconds ((width() / pps) / 64)) {
 789                                 new_position += nearest_distance.get ();
 790                         }
 791                 }
 792         }
 793
 794         if (new_position < DCPTime ()) {
 795                 new_position = DCPTime ();
 796         }
 797
 798         _down_view->content()->set_position (film, new_position, force_emit);
 799
 800         film->set_sequence (false);
 801 }
 802
 803 void
 804 Timeline::force_redraw (dcpomatic::Rect<int> const & r)
 805 {
 806         _main_canvas->RefreshRect (wxRect (r.x, r.y, r.width, r.height), false);
 807 }
 808
 809 shared_ptr<const Film>
 810 Timeline::film () const
 811 {
 812         return _film.lock ();
 813 }
 814
 815 void
 816 Timeline::resized ()
 817 {
 818         if (_main_canvas->GetSize().GetWidth() > 0 && _first_resize) {
 819                 zoom_all ();
 820                 _first_resize = false;
 821         }
 822         setup_scrollbars ();
 823 }
 824
 825 void
 826 Timeline::clear_selection ()
 827 {
 828         for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 829                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 830                 if (cv) {
 831                         cv->set_selected (false);
 832                 }
 833         }
 834 }
 835
 836 TimelineContentViewList
 837 Timeline::selected_views () const
 838 {
 839         TimelineContentViewList sel;
 840
 841         for (TimelineViewList::const_iterator i = _views.begin(); i != _views.end(); ++i) {
 842                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 843                 if (cv && cv->selected()) {
 844                         sel.push_back (cv);
 845                 }
 846         }
 847
 848         return sel;
 849 }
 850
 851 ContentList
 852 Timeline::selected_content () const
 853 {
 854         ContentList sel;
 855         TimelineContentViewList views = selected_views ();
 856
 857         for (TimelineContentViewList::const_iterator i = views.begin(); i != views.end(); ++i) {
 858                 sel.push_back ((*i)->content ());
 859         }
 860
 861         return sel;
 862 }
 863
 864 void
 865 Timeline::set_selection (ContentList selection)
 866 {
 867         for (TimelineViewList::iterator i = _views.begin(); i != _views.end(); ++i) {
 868                 shared_ptr<TimelineContentView> cv = dynamic_pointer_cast<TimelineContentView> (*i);
 869                 if (cv) {
 870                         cv->set_selected (find (selection.begin(), selection.end(), cv->content ()) != selection.end ());
 871                 }
 872         }
 873 }
 874
 875 int
 876 Timeline::tracks_y_offset () const
 877 {
 878         return _reels_view->bbox().height + 4;
 879 }
 880
 881 int
 882 Timeline::width () const
 883 {
 884         return _main_canvas->GetVirtualSize().GetWidth();
 885 }
 886
 887 void
 888 Timeline::scrolled (wxScrollWinEvent& ev)
 889 {
 890         if (ev.GetOrientation() == wxVERTICAL) {
 891                 int x, y;
 892                 _main_canvas->GetViewStart (&x, &y);
 893                 _labels_canvas->Scroll (0, y);
 894         }
 895         ev.Skip ();
 896 }
 897
 898 void
 899 Timeline::tool_clicked (Tool t)
 900 {
 901         switch (t) {
 902         case ZOOM:
 903         case SELECT:
 904                 _tool = t;
 905                 break;
 906         case ZOOM_ALL:
 907                 zoom_all ();
 908                 break;
 909         case SNAP:
 910         case SEQUENCE:
 911                 break;
 912         }
 913 }
 914
 915 void
 916 Timeline::zoom_all ()
 917 {
 918         shared_ptr<Film> film = _film.lock ();
 919         DCPOMATIC_ASSERT (film);
 920         set_pixels_per_second ((_main_canvas->GetSize().GetWidth() - 32) / film->length().seconds());
 921         set_pixels_per_track ((_main_canvas->GetSize().GetHeight() - tracks_y_offset() - _time_axis_view->bbox().height - 32) / _tracks);
 922         setup_scrollbars ();
 923         _main_canvas->Scroll (0, 0);
 924         _labels_canvas->Scroll (0, 0);
 925         Refresh ();
 926 }