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