src/wx/timing_panel.cc

   1 /*
   2     Copyright (C) 2012-2018 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 "timing_panel.h"
  22 #include "wx_util.h"
  23 #include "film_viewer.h"
  24 #include "timecode.h"
  25 #include "content_panel.h"
  26 #include "move_to_dialog.h"
  27 #include "static_text.h"
  28 #include "dcpomatic_button.h"
  29 #include "lib/content.h"
  30 #include "lib/image_content.h"
  31 #include "lib/text_content.h"
  32 #include "lib/dcp_subtitle_content.h"
  33 #include "lib/audio_content.h"
  34 #include "lib/string_text_file_content.h"
  35 #include "lib/video_content.h"
  36 #include "lib/dcp_content.h"
  37 #include "lib/ffmpeg_content.h"
  38 #include <dcp/locale_convert.h>
  39 #ifndef __WXGTK3__
  40 #include <gtk/gtk.h>
  41 #endif
  42 #include <boost/foreach.hpp>
  43 #include <set>
  44 #include <iostream>
  45
  46 using std::cout;
  47 using std::string;
  48 using std::set;
  49 using boost::shared_ptr;
  50 using boost::weak_ptr;
  51 using boost::dynamic_pointer_cast;
  52 using boost::optional;
  53 using dcp::locale_convert;
  54 using namespace dcpomatic;
  55
  56 TimingPanel::TimingPanel (ContentPanel* p, weak_ptr<FilmViewer> viewer)
  57         /* horrid hack for apparent lack of context support with wxWidgets i18n code */
  58         /// TRANSLATORS: translate the word "Timing" here; do not include the "Timing|" prefix
  59         : ContentSubPanel (p, S_("Timing|Timing"))
  60         , _viewer (viewer)
  61         , _film_content_changed_suspender (boost::bind(&TimingPanel::film_content_changed, this, _1))
  62 {
  63         wxSize size = TimecodeBase::size (this);
  64
  65         for (int i = 0; i < 3; ++i) {
  66                 _colon[i] = create_label (this, wxT(":"), false);
  67         }
  68
  69         //// TRANSLATORS: this is an abbreviation for "hours"
  70         _h_label = new StaticText (this, _("h"), wxDefaultPosition, size, wxALIGN_CENTRE_HORIZONTAL);
  71 #ifndef __WXGTK3__
  72         /* Hack to work around failure to centre text on GTK */
  73         gtk_label_set_line_wrap (GTK_LABEL(_h_label->GetHandle()), FALSE);
  74 #endif
  75         //// TRANSLATORS: this is an abbreviation for "minutes"
  76         _m_label = new StaticText (this, _("m"), wxDefaultPosition, size, wxALIGN_CENTRE_HORIZONTAL);
  77 #ifndef __WXGTK3__
  78         gtk_label_set_line_wrap (GTK_LABEL (_m_label->GetHandle()), FALSE);
  79 #endif
  80         //// TRANSLATORS: this is an abbreviation for "seconds"
  81         _s_label = new StaticText (this, _("s"), wxDefaultPosition, size, wxALIGN_CENTRE_HORIZONTAL);
  82 #ifndef __WXGTK3__
  83         gtk_label_set_line_wrap (GTK_LABEL(_s_label->GetHandle()), FALSE);
  84 #endif
  85         //// TRANSLATORS: this is an abbreviation for "frames"
  86         _f_label = new StaticText (this, _("f"), wxDefaultPosition, size, wxALIGN_CENTRE_HORIZONTAL);
  87 #ifndef __WXGTK3__
  88         gtk_label_set_line_wrap (GTK_LABEL(_f_label->GetHandle()), FALSE);
  89 #endif
  90
  91         _position_label = create_label (this, _("Position"), true);
  92         _position = new Timecode<DCPTime> (this);
  93         _move_to_start_of_reel = new Button (this, _("Move to start of reel"));
  94         _full_length_label = create_label (this, _("Full length"), true);
  95         _full_length = new Timecode<DCPTime> (this);
  96         _trim_start_label = create_label (this, _("Trim from start"), true);
  97         _trim_start = new Timecode<ContentTime> (this);
  98         _trim_start_to_playhead = new Button (this, _("Trim up to current position"));
  99         _trim_end_label = create_label (this, _("Trim from end"), true);
 100         _trim_end = new Timecode<ContentTime> (this);
 101         _trim_end_to_playhead = new Button (this, _("Trim after current position"));
 102         _play_length_label = create_label (this, _("Play length"), true);
 103         _play_length = new Timecode<DCPTime> (this);
 104
 105         _video_frame_rate_label = create_label (this, _("Video frame rate"), true);
 106         _video_frame_rate = new wxTextCtrl (this, wxID_ANY);
 107         _set_video_frame_rate = new Button (this, _("Set"));
 108         _set_video_frame_rate->Enable (false);
 109
 110         /* We can't use Wrap() here as it doesn't work with markup:
 111          * http://trac.wxwidgets.org/ticket/13389
 112          */
 113
 114         wxString in = _("<i>Only change this if the content's frame rate has been read incorrectly.</i>");
 115         wxString out;
 116         int const width = 20;
 117         int current = 0;
 118         for (size_t i = 0; i < in.Length(); ++i) {
 119                 if (in[i] == ' ' && current >= width) {
 120                         out += '\n';
 121                         current = 0;
 122                 } else {
 123                         out += in[i];
 124                         ++current;
 125                 }
 126         }
 127
 128         _tip = new StaticText (this, wxT (""));
 129         _tip->SetLabelMarkup (out);
 130 #ifdef DCPOMATIC_OSX
 131         /* Hack to stop hidden text on some versions of OS X */
 132         _tip->SetMinSize (wxSize (-1, 256));
 133 #endif
 134
 135         _position->Changed.connect    (boost::bind (&TimingPanel::position_changed, this));
 136         _move_to_start_of_reel->Bind  (wxEVT_BUTTON, boost::bind (&TimingPanel::move_to_start_of_reel_clicked, this));
 137         _full_length->Changed.connect (boost::bind (&TimingPanel::full_length_changed, this));
 138         _trim_start->Changed.connect  (boost::bind (&TimingPanel::trim_start_changed, this));
 139         _trim_start_to_playhead->Bind (wxEVT_BUTTON, boost::bind (&TimingPanel::trim_start_to_playhead_clicked, this));
 140         _trim_end->Changed.connect    (boost::bind (&TimingPanel::trim_end_changed, this));
 141         _trim_end_to_playhead->Bind   (wxEVT_BUTTON, boost::bind (&TimingPanel::trim_end_to_playhead_clicked, this));
 142         _play_length->Changed.connect (boost::bind (&TimingPanel::play_length_changed, this));
 143         _video_frame_rate->Bind       (wxEVT_TEXT, boost::bind (&TimingPanel::video_frame_rate_changed, this));
 144         _set_video_frame_rate->Bind   (wxEVT_BUTTON, boost::bind (&TimingPanel::set_video_frame_rate, this));
 145
 146         shared_ptr<FilmViewer> fv = _viewer.lock ();
 147         DCPOMATIC_ASSERT (fv);
 148         fv->ImageChanged.connect (boost::bind (&TimingPanel::setup_sensitivity, this));
 149
 150         setup_sensitivity ();
 151         add_to_grid ();
 152 }
 153
 154 void
 155 TimingPanel::add_to_grid ()
 156 {
 157         bool const full = Config::instance()->interface_complexity() == Config::INTERFACE_FULL;
 158
 159         int r = 0;
 160
 161         wxSizer* labels = new wxBoxSizer (wxHORIZONTAL);
 162         labels->Add (_h_label, 1, wxEXPAND);
 163         add_label_to_sizer (labels, _colon[0], false);
 164         labels->Add (_m_label, 1, wxEXPAND);
 165         add_label_to_sizer (labels, _colon[1], false);
 166         labels->Add (_s_label, 1, wxEXPAND);
 167         add_label_to_sizer (labels, _colon[2], false);
 168         labels->Add (_f_label, 1, wxEXPAND);
 169         _grid->Add (labels, wxGBPosition(r, 1));
 170         ++r;
 171
 172         add_label_to_sizer (_grid, _position_label, true, wxGBPosition(r, 0));
 173         _grid->Add (_position, wxGBPosition(r, 1));
 174         ++r;
 175
 176         _move_to_start_of_reel->Show (full);
 177         _full_length_label->Show (full);
 178         _full_length->Show (full);
 179         _play_length_label->Show (full);
 180         _play_length->Show (full);
 181         _video_frame_rate_label->Show (full);
 182         _video_frame_rate->Show (full);
 183         _set_video_frame_rate->Show (full);
 184         _tip->Show (full);
 185
 186         if (full) {
 187                 _grid->Add (_move_to_start_of_reel, wxGBPosition(r, 1));
 188                 ++r;
 189
 190                 add_label_to_sizer (_grid, _full_length_label, true, wxGBPosition(r, 0));
 191                 _grid->Add (_full_length, wxGBPosition(r, 1));
 192                 ++r;
 193         }
 194
 195         add_label_to_sizer (_grid, _trim_start_label, true, wxGBPosition(r, 0));
 196         _grid->Add (_trim_start, wxGBPosition(r, 1));
 197         ++r;
 198
 199         _grid->Add (_trim_start_to_playhead, wxGBPosition(r, 1));
 200         ++r;
 201
 202         add_label_to_sizer (_grid, _trim_end_label, true, wxGBPosition(r, 0));
 203         _grid->Add (_trim_end, wxGBPosition(r, 1));
 204         ++r;
 205
 206         _grid->Add (_trim_end_to_playhead, wxGBPosition(r, 1));
 207         ++r;
 208
 209         if (full) {
 210                 add_label_to_sizer (_grid, _play_length_label, true, wxGBPosition(r, 0));
 211                 _grid->Add (_play_length, wxGBPosition(r, 1));
 212                 ++r;
 213
 214                 {
 215                         add_label_to_sizer (_grid, _video_frame_rate_label, true, wxGBPosition(r, 0));
 216                         wxBoxSizer* s = new wxBoxSizer (wxHORIZONTAL);
 217                         s->Add (_video_frame_rate, 1, wxEXPAND);
 218                         s->Add (_set_video_frame_rate, 0, wxLEFT | wxRIGHT, 8);
 219                         _grid->Add (s, wxGBPosition(r, 1), wxGBSpan(1, 2));
 220                 }
 221                 ++r;
 222
 223                 _grid->Add (_tip, wxGBPosition(r, 1), wxGBSpan(1, 2));
 224         }
 225
 226         /* Completely speculative fix for #891 */
 227         _grid->Layout ();
 228 }
 229
 230 void
 231 TimingPanel::update_full_length ()
 232 {
 233         set<DCPTime> check;
 234         BOOST_FOREACH (shared_ptr<const Content> i, _parent->selected ()) {
 235                 check.insert (i->full_length(_parent->film()));
 236         }
 237
 238         if (check.size() == 1) {
 239                 _full_length->set (_parent->selected().front()->full_length(_parent->film()), _parent->film()->video_frame_rate());
 240         } else {
 241                 _full_length->clear ();
 242         }
 243 }
 244
 245 void
 246 TimingPanel::update_play_length ()
 247 {
 248         set<DCPTime> check;
 249         BOOST_FOREACH (shared_ptr<const Content> i, _parent->selected ()) {
 250                 check.insert (i->length_after_trim(_parent->film()));
 251         }
 252
 253         if (check.size() == 1) {
 254                 _play_length->set (_parent->selected().front()->length_after_trim(_parent->film()), _parent->film()->video_frame_rate());
 255         } else {
 256                 _play_length->clear ();
 257         }
 258 }
 259
 260 void
 261 TimingPanel::film_content_changed (int property)
 262 {
 263         if (_film_content_changed_suspender.check(property)) {
 264                 return;
 265         }
 266
 267         int const film_video_frame_rate = _parent->film()->video_frame_rate ();
 268
 269         /* Here we check to see if we have exactly one different value of various
 270            properties, and fill the controls with that value if so.
 271         */
 272
 273         if (property == ContentProperty::POSITION) {
 274
 275                 set<DCPTime> check;
 276                 BOOST_FOREACH (shared_ptr<const Content> i, _parent->selected ()) {
 277                         check.insert (i->position ());
 278                 }
 279
 280                 if (check.size() == 1) {
 281                         _position->set (_parent->selected().front()->position(), film_video_frame_rate);
 282                 } else {
 283                         _position->clear ();
 284                 }
 285
 286         } else if (
 287                 property == ContentProperty::LENGTH ||
 288                 property == ContentProperty::VIDEO_FRAME_RATE ||
 289                 property == VideoContentProperty::FRAME_TYPE
 290                 ) {
 291
 292                 update_full_length ();
 293
 294         } else if (property == ContentProperty::TRIM_START) {
 295
 296                 set<ContentTime> check;
 297                 BOOST_FOREACH (shared_ptr<const Content> i, _parent->selected ()) {
 298                         check.insert (i->trim_start ());
 299                 }
 300
 301                 if (check.size() == 1) {
 302                         _trim_start->set (_parent->selected().front()->trim_start (), film_video_frame_rate);
 303                 } else {
 304                         _trim_start->clear ();
 305                 }
 306
 307         } else if (property == ContentProperty::TRIM_END) {
 308
 309                 set<ContentTime> check;
 310                 BOOST_FOREACH (shared_ptr<const Content> i, _parent->selected ()) {
 311                         check.insert (i->trim_end ());
 312                 }
 313
 314                 if (check.size() == 1) {
 315                         _trim_end->set (_parent->selected().front()->trim_end (), film_video_frame_rate);
 316                 } else {
 317                         _trim_end->clear ();
 318                 }
 319         }
 320
 321         if (
 322                 property == ContentProperty::LENGTH ||
 323                 property == ContentProperty::TRIM_START ||
 324                 property == ContentProperty::TRIM_END ||
 325                 property == ContentProperty::VIDEO_FRAME_RATE ||
 326                 property == VideoContentProperty::FRAME_TYPE
 327                 ) {
 328
 329                 update_play_length ();
 330         }
 331
 332         if (property == ContentProperty::VIDEO_FRAME_RATE) {
 333                 set<double> check_vc;
 334                 shared_ptr<const Content> content;
 335                 int count_ac = 0;
 336                 int count_sc = 0;
 337                 BOOST_FOREACH (shared_ptr<const Content> i, _parent->selected ()) {
 338                         if (i->video && i->video_frame_rate()) {
 339                                 check_vc.insert (i->video_frame_rate().get());
 340                                 content = i;
 341                         }
 342                         if (i->audio && i->video_frame_rate()) {
 343                                 ++count_ac;
 344                                 content = i;
 345                         }
 346                         if (!i->text.empty() && i->video_frame_rate()) {
 347                                 ++count_sc;
 348                                 content = i;
 349                         }
 350
 351                 }
 352
 353                 bool const single_frame_image_content = content && dynamic_pointer_cast<const ImageContent> (content) && content->number_of_paths() == 1;
 354
 355                 if ((check_vc.size() == 1 || count_ac == 1 || count_sc == 1) && !single_frame_image_content) {
 356                         checked_set (_video_frame_rate, locale_convert<string> (content->video_frame_rate().get(), 5));
 357                         _video_frame_rate->Enable (true);
 358                 } else {
 359                         checked_set (_video_frame_rate, wxT (""));
 360                         _video_frame_rate->Enable (false);
 361                 }
 362         }
 363
 364         bool have_still = false;
 365         BOOST_FOREACH (shared_ptr<const Content> i, _parent->selected ()) {
 366                 shared_ptr<const ImageContent> ic = dynamic_pointer_cast<const ImageContent> (i);
 367                 if (ic && ic->still ()) {
 368                         have_still = true;
 369                 }
 370         }
 371
 372         _full_length->set_editable (have_still);
 373         _play_length->set_editable (!have_still);
 374         _set_video_frame_rate->Enable (false);
 375         setup_sensitivity ();
 376 }
 377
 378 void
 379 TimingPanel::position_changed ()
 380 {
 381         DCPTime const pos = _position->get (_parent->film()->video_frame_rate ());
 382         BOOST_FOREACH (shared_ptr<Content> i, _parent->selected ()) {
 383                 i->set_position (_parent->film(), pos);
 384         }
 385 }
 386
 387 void
 388 TimingPanel::full_length_changed ()
 389 {
 390         int const vfr = _parent->film()->video_frame_rate ();
 391         Frame const len = _full_length->get (vfr).frames_round (vfr);
 392         BOOST_FOREACH (shared_ptr<Content> i, _parent->selected ()) {
 393                 shared_ptr<ImageContent> ic = dynamic_pointer_cast<ImageContent> (i);
 394                 if (ic && ic->still ()) {
 395                         ic->video->set_length (len);
 396                 }
 397         }
 398 }
 399
 400 void
 401 TimingPanel::trim_start_changed ()
 402 {
 403         shared_ptr<FilmViewer> fv = _viewer.lock ();
 404         if (!fv) {
 405                 return;
 406         }
 407
 408         DCPTime const ph = fv->position ();
 409
 410         fv->set_coalesce_player_changes (true);
 411
 412         shared_ptr<Content> ref;
 413         optional<FrameRateChange> ref_frc;
 414         optional<DCPTime> ref_ph;
 415
 416         Suspender::Block bl = _film_content_changed_suspender.block ();
 417         BOOST_FOREACH (shared_ptr<Content> i, _parent->selected ()) {
 418                 if (i->position() <= ph && ph < i->end(_parent->film())) {
 419                         /* The playhead is in i.  Use it as a reference to work out
 420                            where to put the playhead post-trim; we're trying to keep the playhead
 421                            at the same frame of content that we're looking at pre-trim.
 422                         */
 423                         ref = i;
 424                         ref_frc = _parent->film()->active_frame_rate_change (i->position ());
 425                         ref_ph = ph - i->position() + DCPTime (i->trim_start(), ref_frc.get());
 426                 }
 427
 428                 ContentTime const trim = _trim_start->get (i->video_frame_rate().get_value_or(_parent->film()->video_frame_rate()));
 429                 i->set_trim_start (trim);
 430         }
 431
 432         if (ref) {
 433                 fv->seek (max(DCPTime(), ref_ph.get() + ref->position() - DCPTime(ref->trim_start(), ref_frc.get())), true);
 434         }
 435
 436         fv->set_coalesce_player_changes (false);
 437 }
 438
 439 void
 440 TimingPanel::trim_end_changed ()
 441 {
 442         shared_ptr<FilmViewer> fv = _viewer.lock ();
 443         if (!fv) {
 444                 return;
 445         }
 446
 447         fv->set_coalesce_player_changes (true);
 448
 449         Suspender::Block bl = _film_content_changed_suspender.block ();
 450         BOOST_FOREACH (shared_ptr<Content> i, _parent->selected ()) {
 451                 ContentTime const trim = _trim_end->get (i->video_frame_rate().get_value_or(_parent->film()->video_frame_rate()));
 452                 i->set_trim_end (trim);
 453         }
 454
 455         /* XXX: maybe playhead-off-the-end-of-the-film should be handled elsewhere */
 456         if (fv->position() >= _parent->film()->length()) {
 457                 fv->seek (_parent->film()->length() - DCPTime::from_frames(1, _parent->film()->video_frame_rate()), true);
 458         }
 459
 460         fv->set_coalesce_player_changes (false);
 461 }
 462
 463 void
 464 TimingPanel::play_length_changed ()
 465 {
 466         DCPTime const play_length = _play_length->get (_parent->film()->video_frame_rate());
 467         Suspender::Block bl = _film_content_changed_suspender.block ();
 468         BOOST_FOREACH (shared_ptr<Content> i, _parent->selected ()) {
 469                 FrameRateChange const frc = _parent->film()->active_frame_rate_change (i->position ());
 470                 i->set_trim_end (
 471                         ContentTime (max(DCPTime(), i->full_length(_parent->film()) - play_length), frc) - i->trim_start()
 472                         );
 473         }
 474 }
 475
 476 void
 477 TimingPanel::video_frame_rate_changed ()
 478 {
 479         bool enable = true;
 480         if (_video_frame_rate->GetValue() == wxT("")) {
 481                 /* No frame rate has been entered; if the user clicks "set" now it would unset the video
 482                    frame rate in the selected content.  This can't be allowed for some content types.
 483                 */
 484                 BOOST_FOREACH (shared_ptr<Content> i, _parent->selected()) {
 485                         if (
 486                                 dynamic_pointer_cast<DCPContent>(i) ||
 487                                 dynamic_pointer_cast<FFmpegContent>(i)
 488                                 ) {
 489                                 enable = false;
 490                         }
 491                 }
 492         }
 493
 494         _set_video_frame_rate->Enable (enable);
 495 }
 496
 497 void
 498 TimingPanel::set_video_frame_rate ()
 499 {
 500         optional<double> fr;
 501         if (_video_frame_rate->GetValue() != wxT("")) {
 502                 fr = locale_convert<double> (wx_to_std (_video_frame_rate->GetValue ()));
 503         }
 504         Suspender::Block bl = _film_content_changed_suspender.block ();
 505         BOOST_FOREACH (shared_ptr<Content> i, _parent->selected ()) {
 506                 if (fr) {
 507                         i->set_video_frame_rate (*fr);
 508                 } else {
 509                         i->unset_video_frame_rate ();
 510                 }
 511         }
 512
 513         _set_video_frame_rate->Enable (false);
 514 }
 515
 516 void
 517 TimingPanel::content_selection_changed ()
 518 {
 519         setup_sensitivity ();
 520
 521         film_content_changed (ContentProperty::POSITION);
 522         film_content_changed (ContentProperty::LENGTH);
 523         film_content_changed (ContentProperty::TRIM_START);
 524         film_content_changed (ContentProperty::TRIM_END);
 525         film_content_changed (ContentProperty::VIDEO_FRAME_RATE);
 526 }
 527
 528 void
 529 TimingPanel::film_changed (Film::Property p)
 530 {
 531         if (p == Film::VIDEO_FRAME_RATE) {
 532                 update_full_length ();
 533                 update_play_length ();
 534         }
 535 }
 536
 537 void
 538 TimingPanel::trim_start_to_playhead_clicked ()
 539 {
 540         shared_ptr<FilmViewer> fv = _viewer.lock ();
 541         if (!fv) {
 542                 return;
 543         }
 544
 545         shared_ptr<const Film> film = _parent->film ();
 546         DCPTime const ph = fv->position().floor (film->video_frame_rate ());
 547         optional<DCPTime> new_ph;
 548
 549         fv->set_coalesce_player_changes (true);
 550
 551         BOOST_FOREACH (shared_ptr<Content> i, _parent->selected ()) {
 552                 if (i->position() < ph && ph < i->end(film)) {
 553                         FrameRateChange const frc = film->active_frame_rate_change (i->position());
 554                         i->set_trim_start (i->trim_start() + ContentTime (ph - i->position(), frc));
 555                         new_ph = i->position ();
 556                 }
 557         }
 558
 559         if (new_ph) {
 560                 fv->seek (new_ph.get(), true);
 561         }
 562
 563         fv->set_coalesce_player_changes (false);
 564 }
 565
 566 void
 567 TimingPanel::trim_end_to_playhead_clicked ()
 568 {
 569         shared_ptr<FilmViewer> fv = _viewer.lock ();
 570         if (!fv) {
 571                 return;
 572         }
 573
 574         shared_ptr<const Film> film = _parent->film ();
 575         DCPTime const ph = fv->position().floor (film->video_frame_rate ());
 576         BOOST_FOREACH (shared_ptr<Content> i, _parent->selected ()) {
 577                 if (i->position() < ph && ph < i->end(film)) {
 578                         FrameRateChange const frc = film->active_frame_rate_change (i->position ());
 579                         i->set_trim_end (ContentTime(i->position() + i->full_length(film) - ph - DCPTime::from_frames(1, frc.dcp), frc) - i->trim_start());
 580                 }
 581         }
 582 }
 583
 584 void
 585 TimingPanel::setup_sensitivity ()
 586 {
 587         bool const e = !_parent->selected().empty ();
 588
 589         _position->Enable (e);
 590         _move_to_start_of_reel->Enable (e);
 591         _full_length->Enable (e);
 592         _trim_start->Enable (e);
 593         _trim_end->Enable (e);
 594         _play_length->Enable (e);
 595         _video_frame_rate->Enable (e);
 596
 597         shared_ptr<FilmViewer> fv = _viewer.lock ();
 598         DCPOMATIC_ASSERT (fv);
 599         DCPTime const ph = fv->position ();
 600         bool any_over_ph = false;
 601         BOOST_FOREACH (shared_ptr<const Content> i, _parent->selected ()) {
 602                 if (i->position() <= ph && ph < i->end(_parent->film())) {
 603                         any_over_ph = true;
 604                 }
 605         }
 606
 607         _trim_start_to_playhead->Enable (any_over_ph);
 608         _trim_end_to_playhead->Enable (any_over_ph);
 609 }
 610
 611 void
 612 TimingPanel::move_to_start_of_reel_clicked ()
 613 {
 614         /* Find common position of all selected content, if it exists */
 615
 616         optional<DCPTime> position;
 617         BOOST_FOREACH (shared_ptr<Content> i, _parent->selected ()) {
 618                 if (!position) {
 619                         position = i->position();
 620                 } else {
 621                         if (position.get() != i->position()) {
 622                                 position.reset ();
 623                                 break;
 624                         }
 625                 }
 626         }
 627
 628         MoveToDialog* d = new MoveToDialog (this, position, _parent->film());
 629
 630         if (d->ShowModal() == wxID_OK) {
 631                 BOOST_FOREACH (shared_ptr<Content> i, _parent->selected()) {
 632                         i->set_position (_parent->film(), d->position());
 633                 }
 634         }
 635         d->Destroy ();
 636 }