src/wx/timing_panel.cc

   1 /*
   2     Copyright (C) 2012-2016 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 "lib/content.h"
  28 #include "lib/image_content.h"
  29 #include "lib/text_content.h"
  30 #include "lib/dcp_subtitle_content.h"
  31 #include "lib/audio_content.h"
  32 #include "lib/string_text_file_content.h"
  33 #include "lib/video_content.h"
  34 #include <dcp/locale_convert.h>
  35 #include <boost/foreach.hpp>
  36 #include <set>
  37 #include <iostream>
  38
  39 using std::cout;
  40 using std::string;
  41 using std::set;
  42 using boost::shared_ptr;
  43 using boost::weak_ptr;
  44 using boost::dynamic_pointer_cast;
  45 using boost::optional;
  46 using dcp::locale_convert;
  47
  48 TimingPanel::TimingPanel (ContentPanel* p, weak_ptr<FilmViewer> viewer)
  49         /* horrid hack for apparent lack of context support with wxWidgets i18n code */
  50         /// TRANSLATORS: translate the word "Timing" here; do not include the "Timing|" prefix
  51         : ContentSubPanel (p, S_("Timing|Timing"))
  52         , _viewer (viewer)
  53 {
  54         wxSize size = TimecodeBase::size (this);
  55
  56         for (int i = 0; i < 3; ++i) {
  57                 _colon[i] = create_label (this, wxT(":"), false);
  58         }
  59
  60         //// TRANSLATORS: this is an abbreviation for "hours"
  61         _h_label = new wxStaticText (this, wxID_ANY, _("h"), wxDefaultPosition, size, wxALIGN_CENTRE_HORIZONTAL);
  62 #ifdef DCPOMATIC_LINUX
  63         /* Hack to work around failure to centre text on GTK */
  64         gtk_label_set_line_wrap (GTK_LABEL(_h_label->GetHandle()), FALSE);
  65 #endif
  66         //// TRANSLATORS: this is an abbreviation for "minutes"
  67         _m_label = new wxStaticText (this, wxID_ANY, _("m"), wxDefaultPosition, size, wxALIGN_CENTRE_HORIZONTAL);
  68 #ifdef DCPOMATIC_LINUX
  69         gtk_label_set_line_wrap (GTK_LABEL (_m_label->GetHandle()), FALSE);
  70 #endif
  71         //// TRANSLATORS: this is an abbreviation for "seconds"
  72         _s_label = new wxStaticText (this, wxID_ANY, _("s"), wxDefaultPosition, size, wxALIGN_CENTRE_HORIZONTAL);
  73 #ifdef DCPOMATIC_LINUX
  74         gtk_label_set_line_wrap (GTK_LABEL(_s_label->GetHandle()), FALSE);
  75 #endif
  76         //// TRANSLATORS: this is an abbreviation for "frames"
  77         _f_label = new wxStaticText (this, wxID_ANY, _("f"), wxDefaultPosition, size, wxALIGN_CENTRE_HORIZONTAL);
  78 #ifdef DCPOMATIC_LINUX
  79         gtk_label_set_line_wrap (GTK_LABEL(_f_label->GetHandle()), FALSE);
  80 #endif
  81
  82         _position_label = create_label (this, _("Position"), true);
  83         _position = new Timecode<DCPTime> (this);
  84         _move_to_start_of_reel = new wxButton (this, wxID_ANY, _("Move to start of reel"));
  85         _full_length_label = create_label (this, _("Full length"), true);
  86         _full_length = new Timecode<DCPTime> (this);
  87         _trim_start_label = create_label (this, _("Trim from start"), true);
  88         _trim_start = new Timecode<ContentTime> (this);
  89         _trim_start_to_playhead = new wxButton (this, wxID_ANY, _("Trim up to current position"));
  90         _trim_end_label = create_label (this, _("Trim from end"), true);
  91         _trim_end = new Timecode<ContentTime> (this);
  92         _trim_end_to_playhead = new wxButton (this, wxID_ANY, _("Trim after current position"));
  93         _play_length_label = create_label (this, _("Play length"), true);
  94         _play_length = new Timecode<DCPTime> (this);
  95
  96         _video_frame_rate_label = create_label (this, _("Video frame rate"), true);
  97         _video_frame_rate = new wxTextCtrl (this, wxID_ANY);
  98         _set_video_frame_rate = new wxButton (this, wxID_ANY, _("Set"));
  99         _set_video_frame_rate->Enable (false);
 100
 101         /* We can't use Wrap() here as it doesn't work with markup:
 102          * http://trac.wxwidgets.org/ticket/13389
 103          */
 104
 105         wxString in = _("<i>Only change this if the content's frame rate has been read incorrectly.</i>");
 106         wxString out;
 107         int const width = 20;
 108         int current = 0;
 109         for (size_t i = 0; i < in.Length(); ++i) {
 110                 if (in[i] == ' ' && current >= width) {
 111                         out += '\n';
 112                         current = 0;
 113                 } else {
 114                         out += in[i];
 115                         ++current;
 116                 }
 117         }
 118
 119         _tip = new wxStaticText (this, wxID_ANY, wxT (""));
 120         _tip->SetLabelMarkup (out);
 121 #ifdef DCPOMATIC_OSX
 122         /* Hack to stop hidden text on some versions of OS X */
 123         _tip->SetMinSize (wxSize (-1, 256));
 124 #endif
 125
 126         _position->Changed.connect    (boost::bind (&TimingPanel::position_changed, this));
 127         _move_to_start_of_reel->Bind  (wxEVT_BUTTON, boost::bind (&TimingPanel::move_to_start_of_reel_clicked, this));
 128         _full_length->Changed.connect (boost::bind (&TimingPanel::full_length_changed, this));
 129         _trim_start->Changed.connect  (boost::bind (&TimingPanel::trim_start_changed, this));
 130         _trim_start_to_playhead->Bind (wxEVT_BUTTON, boost::bind (&TimingPanel::trim_start_to_playhead_clicked, this));
 131         _trim_end->Changed.connect    (boost::bind (&TimingPanel::trim_end_changed, this));
 132         _trim_end_to_playhead->Bind   (wxEVT_BUTTON, boost::bind (&TimingPanel::trim_end_to_playhead_clicked, this));
 133         _play_length->Changed.connect (boost::bind (&TimingPanel::play_length_changed, this));
 134         _video_frame_rate->Bind       (wxEVT_TEXT, boost::bind (&TimingPanel::video_frame_rate_changed, this));
 135         _set_video_frame_rate->Bind   (wxEVT_BUTTON, boost::bind (&TimingPanel::set_video_frame_rate, this));
 136
 137         shared_ptr<FilmViewer> fv = _viewer.lock ();
 138         DCPOMATIC_ASSERT (fv);
 139         fv->ImageChanged.connect (boost::bind (&TimingPanel::setup_sensitivity, this));
 140
 141         setup_sensitivity ();
 142         add_to_grid ();
 143 }
 144
 145 void
 146 TimingPanel::add_to_grid ()
 147 {
 148         bool const full = Config::instance()->interface_complexity() == Config::INTERFACE_FULL;
 149
 150         int r = 0;
 151
 152         wxSizer* labels = new wxBoxSizer (wxHORIZONTAL);
 153         labels->Add (_h_label, 1, wxEXPAND);
 154         add_label_to_sizer (labels, _colon[0], false);
 155         labels->Add (_m_label, 1, wxEXPAND);
 156         add_label_to_sizer (labels, _colon[1], false);
 157         labels->Add (_s_label, 1, wxEXPAND);
 158         add_label_to_sizer (labels, _colon[2], false);
 159         labels->Add (_f_label, 1, wxEXPAND);
 160         _grid->Add (labels, wxGBPosition(r, 1));
 161         ++r;
 162
 163         add_label_to_sizer (_grid, _position_label, true, wxGBPosition(r, 0));
 164         _grid->Add (_position, wxGBPosition(r, 1));
 165         ++r;
 166
 167         _move_to_start_of_reel->Show (full);
 168         _full_length_label->Show (full);
 169         _full_length->Show (full);
 170         _trim_start_label->Show (full);
 171         _trim_start->Show (full);
 172         _trim_start_to_playhead->Show (full);
 173         _trim_end_label->Show (full);
 174         _trim_end->Show (full);
 175         _trim_end_to_playhead->Show (full);
 176         _play_length_label->Show (full);
 177         _play_length->Show (full);
 178         _video_frame_rate_label->Show (full);
 179         _video_frame_rate->Show (full);
 180         _set_video_frame_rate->Show (full);
 181         _tip->Show (full);
 182
 183         if (full) {
 184                 _grid->Add (_move_to_start_of_reel, wxGBPosition(r, 1));
 185                 ++r;
 186
 187                 add_label_to_sizer (_grid, _full_length_label, true, wxGBPosition(r, 0));
 188                 _grid->Add (_full_length, wxGBPosition(r, 1));
 189                 ++r;
 190
 191                 add_label_to_sizer (_grid, _trim_start_label, true, wxGBPosition(r, 0));
 192                 _grid->Add (_trim_start, wxGBPosition(r, 1));
 193                 ++r;
 194
 195                 _grid->Add (_trim_start_to_playhead, wxGBPosition(r, 1));
 196                 ++r;
 197
 198                 add_label_to_sizer (_grid, _trim_end_label, true, wxGBPosition(r, 0));
 199                 _grid->Add (_trim_end, wxGBPosition(r, 1));
 200                 ++r;
 201
 202                 _grid->Add (_trim_end_to_playhead, wxGBPosition(r, 1));
 203                 ++r;
 204
 205                 add_label_to_sizer (_grid, _play_length_label, true, wxGBPosition(r, 0));
 206                 _grid->Add (_play_length, wxGBPosition(r, 1));
 207                 ++r;
 208
 209                 {
 210                         add_label_to_sizer (_grid, _video_frame_rate_label, true, wxGBPosition(r, 0));
 211                         wxBoxSizer* s = new wxBoxSizer (wxHORIZONTAL);
 212                         s->Add (_video_frame_rate, 1, wxEXPAND);
 213                         s->Add (_set_video_frame_rate, 0, wxLEFT | wxRIGHT, 8);
 214                         _grid->Add (s, wxGBPosition(r, 1), wxGBSpan(1, 2));
 215                 }
 216                 ++r;
 217
 218                 _grid->Add (_tip, wxGBPosition(r, 1), wxGBSpan(1, 2));
 219         }
 220
 221         /* Completely speculative fix for #891 */
 222         _grid->Layout ();
 223 }
 224
 225 void
 226 TimingPanel::update_full_length ()
 227 {
 228         set<DCPTime> check;
 229         BOOST_FOREACH (shared_ptr<const Content> i, _parent->selected ()) {
 230                 check.insert (i->full_length(_parent->film()));
 231         }
 232
 233         if (check.size() == 1) {
 234                 _full_length->set (_parent->selected().front()->full_length(_parent->film()), _parent->film()->video_frame_rate());
 235         } else {
 236                 _full_length->clear ();
 237         }
 238 }
 239
 240 void
 241 TimingPanel::update_play_length ()
 242 {
 243         set<DCPTime> check;
 244         BOOST_FOREACH (shared_ptr<const Content> i, _parent->selected ()) {
 245                 check.insert (i->length_after_trim(_parent->film()));
 246         }
 247
 248         if (check.size() == 1) {
 249                 _play_length->set (_parent->selected().front()->length_after_trim(_parent->film()), _parent->film()->video_frame_rate());
 250         } else {
 251                 _play_length->clear ();
 252         }
 253 }
 254
 255 void
 256 TimingPanel::film_content_changed (int property)
 257 {
 258         int const film_video_frame_rate = _parent->film()->video_frame_rate ();
 259
 260         /* Here we check to see if we have exactly one different value of various
 261            properties, and fill the controls with that value if so.
 262         */
 263
 264         if (property == ContentProperty::POSITION) {
 265
 266                 set<DCPTime> check;
 267                 BOOST_FOREACH (shared_ptr<const Content> i, _parent->selected ()) {
 268                         check.insert (i->position ());
 269                 }
 270
 271                 if (check.size() == 1) {
 272                         _position->set (_parent->selected().front()->position(), film_video_frame_rate);
 273                 } else {
 274                         _position->clear ();
 275                 }
 276
 277         } else if (
 278                 property == ContentProperty::LENGTH ||
 279                 property == ContentProperty::VIDEO_FRAME_RATE ||
 280                 property == VideoContentProperty::FRAME_TYPE
 281                 ) {
 282
 283                 update_full_length ();
 284
 285         } else if (property == ContentProperty::TRIM_START) {
 286
 287                 set<ContentTime> check;
 288                 BOOST_FOREACH (shared_ptr<const Content> i, _parent->selected ()) {
 289                         check.insert (i->trim_start ());
 290                 }
 291
 292                 if (check.size() == 1) {
 293                         _trim_start->set (_parent->selected().front()->trim_start (), film_video_frame_rate);
 294                 } else {
 295                         _trim_start->clear ();
 296                 }
 297
 298         } else if (property == ContentProperty::TRIM_END) {
 299
 300                 set<ContentTime> check;
 301                 BOOST_FOREACH (shared_ptr<const Content> i, _parent->selected ()) {
 302                         check.insert (i->trim_end ());
 303                 }
 304
 305                 if (check.size() == 1) {
 306                         _trim_end->set (_parent->selected().front()->trim_end (), film_video_frame_rate);
 307                 } else {
 308                         _trim_end->clear ();
 309                 }
 310         }
 311
 312         if (
 313                 property == ContentProperty::LENGTH ||
 314                 property == ContentProperty::TRIM_START ||
 315                 property == ContentProperty::TRIM_END ||
 316                 property == ContentProperty::VIDEO_FRAME_RATE ||
 317                 property == VideoContentProperty::FRAME_TYPE
 318                 ) {
 319
 320                 update_play_length ();
 321         }
 322
 323         if (property == ContentProperty::VIDEO_FRAME_RATE) {
 324                 set<double> check_vc;
 325                 shared_ptr<const Content> content;
 326                 int count_ac = 0;
 327                 int count_sc = 0;
 328                 BOOST_FOREACH (shared_ptr<const Content> i, _parent->selected ()) {
 329                         if (i->video && i->video_frame_rate()) {
 330                                 check_vc.insert (i->video_frame_rate().get());
 331                                 content = i;
 332                         }
 333                         if (i->audio && i->video_frame_rate()) {
 334                                 ++count_ac;
 335                                 content = i;
 336                         }
 337                         if (!i->text.empty() && i->video_frame_rate()) {
 338                                 ++count_sc;
 339                                 content = i;
 340                         }
 341
 342                 }
 343
 344                 bool const single_frame_image_content = content && dynamic_pointer_cast<const ImageContent> (content) && content->number_of_paths() == 1;
 345
 346                 if ((check_vc.size() == 1 || count_ac == 1 || count_sc == 1) && !single_frame_image_content) {
 347                         checked_set (_video_frame_rate, locale_convert<string> (content->video_frame_rate().get(), 5));
 348                         _video_frame_rate->Enable (true);
 349                 } else {
 350                         checked_set (_video_frame_rate, wxT (""));
 351                         _video_frame_rate->Enable (false);
 352                 }
 353         }
 354
 355         bool have_still = false;
 356         BOOST_FOREACH (shared_ptr<const Content> i, _parent->selected ()) {
 357                 shared_ptr<const ImageContent> ic = dynamic_pointer_cast<const ImageContent> (i);
 358                 if (ic && ic->still ()) {
 359                         have_still = true;
 360                 }
 361         }
 362
 363         _full_length->set_editable (have_still);
 364         _play_length->set_editable (!have_still);
 365         _set_video_frame_rate->Enable (false);
 366         setup_sensitivity ();
 367 }
 368
 369 void
 370 TimingPanel::position_changed ()
 371 {
 372         DCPTime const pos = _position->get (_parent->film()->video_frame_rate ());
 373         BOOST_FOREACH (shared_ptr<Content> i, _parent->selected ()) {
 374                 i->set_position (_parent->film(), pos);
 375         }
 376 }
 377
 378 void
 379 TimingPanel::full_length_changed ()
 380 {
 381         int const vfr = _parent->film()->video_frame_rate ();
 382         Frame const len = _full_length->get (vfr).frames_round (vfr);
 383         BOOST_FOREACH (shared_ptr<Content> i, _parent->selected ()) {
 384                 shared_ptr<ImageContent> ic = dynamic_pointer_cast<ImageContent> (i);
 385                 if (ic && ic->still ()) {
 386                         ic->video->set_length (len);
 387                 }
 388         }
 389 }
 390
 391 void
 392 TimingPanel::trim_start_changed ()
 393 {
 394         shared_ptr<FilmViewer> fv = _viewer.lock ();
 395         if (!fv) {
 396                 return;
 397         }
 398
 399         DCPTime const ph = fv->position ();
 400
 401         fv->set_coalesce_player_changes (true);
 402
 403         shared_ptr<Content> ref;
 404         optional<FrameRateChange> ref_frc;
 405         optional<DCPTime> ref_ph;
 406
 407         ContentTime const trim = _trim_start->get (_parent->film()->video_frame_rate ());
 408
 409         BOOST_FOREACH (shared_ptr<Content> i, _parent->selected ()) {
 410                 if (i->position() <= ph && ph < i->end(_parent->film())) {
 411                         /* The playhead is in i.  Use it as a reference to work out
 412                            where to put the playhead post-trim; we're trying to keep the playhead
 413                            at the same frame of content that we're looking at pre-trim.
 414                         */
 415                         ref = i;
 416                         ref_frc = _parent->film()->active_frame_rate_change (i->position ());
 417                         ref_ph = ph - i->position() + DCPTime (i->trim_start(), ref_frc.get());
 418                 }
 419
 420                 i->set_trim_start (trim);
 421         }
 422
 423         if (ref) {
 424                 fv->seek (max(DCPTime(), ref_ph.get() + ref->position() - DCPTime(ref->trim_start(), ref_frc.get())), true);
 425         }
 426
 427         fv->set_coalesce_player_changes (false);
 428 }
 429
 430 void
 431 TimingPanel::trim_end_changed ()
 432 {
 433         shared_ptr<FilmViewer> fv = _viewer.lock ();
 434         if (!fv) {
 435                 return;
 436         }
 437
 438         fv->set_coalesce_player_changes (true);
 439
 440         ContentTime const trim = _trim_end->get (_parent->film()->video_frame_rate ());
 441         BOOST_FOREACH (shared_ptr<Content> i, _parent->selected ()) {
 442                 i->set_trim_end (trim);
 443         }
 444
 445         /* XXX: maybe playhead-off-the-end-of-the-film should be handled elsewhere */
 446         if (fv->position() >= _parent->film()->length()) {
 447                 fv->seek (_parent->film()->length() - DCPTime::from_frames(1, _parent->film()->video_frame_rate()), true);
 448         }
 449
 450         fv->set_coalesce_player_changes (true);
 451 }
 452
 453 void
 454 TimingPanel::play_length_changed ()
 455 {
 456         DCPTime const play_length = _play_length->get (_parent->film()->video_frame_rate());
 457         BOOST_FOREACH (shared_ptr<Content> i, _parent->selected ()) {
 458                 FrameRateChange const frc = _parent->film()->active_frame_rate_change (i->position ());
 459                 i->set_trim_end (
 460                         ContentTime (max(DCPTime(), i->full_length(_parent->film()) - play_length), frc) - i->trim_start()
 461                         );
 462         }
 463 }
 464
 465 void
 466 TimingPanel::video_frame_rate_changed ()
 467 {
 468         _set_video_frame_rate->Enable (true);
 469 }
 470
 471 void
 472 TimingPanel::set_video_frame_rate ()
 473 {
 474         optional<double> fr;
 475         if (_video_frame_rate->GetValue() != wxT("")) {
 476                 fr = locale_convert<double> (wx_to_std (_video_frame_rate->GetValue ()));
 477         }
 478         BOOST_FOREACH (shared_ptr<Content> i, _parent->selected ()) {
 479                 if (fr) {
 480                         i->set_video_frame_rate (*fr);
 481                 } else {
 482                         i->unset_video_frame_rate ();
 483                 }
 484         }
 485
 486         _set_video_frame_rate->Enable (false);
 487 }
 488
 489 void
 490 TimingPanel::content_selection_changed ()
 491 {
 492         setup_sensitivity ();
 493
 494         film_content_changed (ContentProperty::POSITION);
 495         film_content_changed (ContentProperty::LENGTH);
 496         film_content_changed (ContentProperty::TRIM_START);
 497         film_content_changed (ContentProperty::TRIM_END);
 498         film_content_changed (ContentProperty::VIDEO_FRAME_RATE);
 499 }
 500
 501 void
 502 TimingPanel::film_changed (Film::Property p)
 503 {
 504         if (p == Film::VIDEO_FRAME_RATE) {
 505                 update_full_length ();
 506                 update_play_length ();
 507         }
 508 }
 509
 510 void
 511 TimingPanel::trim_start_to_playhead_clicked ()
 512 {
 513         shared_ptr<FilmViewer> fv = _viewer.lock ();
 514         if (!fv) {
 515                 return;
 516         }
 517
 518         shared_ptr<const Film> film = _parent->film ();
 519         DCPTime const ph = fv->position().floor (film->video_frame_rate ());
 520         optional<DCPTime> new_ph;
 521
 522         fv->set_coalesce_player_changes (true);
 523
 524         BOOST_FOREACH (shared_ptr<Content> i, _parent->selected ()) {
 525                 if (i->position() < ph && ph < i->end(film)) {
 526                         FrameRateChange const frc = film->active_frame_rate_change (i->position());
 527                         i->set_trim_start (i->trim_start() + ContentTime (ph - i->position(), frc));
 528                         new_ph = i->position ();
 529                 }
 530         }
 531
 532         if (new_ph) {
 533                 fv->seek (new_ph.get(), true);
 534         }
 535
 536         fv->set_coalesce_player_changes (false);
 537 }
 538
 539 void
 540 TimingPanel::trim_end_to_playhead_clicked ()
 541 {
 542         shared_ptr<FilmViewer> fv = _viewer.lock ();
 543         if (!fv) {
 544                 return;
 545         }
 546
 547         shared_ptr<const Film> film = _parent->film ();
 548         DCPTime const ph = fv->position().floor (film->video_frame_rate ());
 549         BOOST_FOREACH (shared_ptr<Content> i, _parent->selected ()) {
 550                 if (i->position() < ph && ph < i->end(film)) {
 551                         FrameRateChange const frc = film->active_frame_rate_change (i->position ());
 552                         i->set_trim_end (ContentTime(i->position() + i->full_length(film) - ph - DCPTime::from_frames(1, frc.dcp), frc) - i->trim_start());
 553                 }
 554         }
 555 }
 556
 557 void
 558 TimingPanel::setup_sensitivity ()
 559 {
 560         bool const e = !_parent->selected().empty ();
 561
 562         _position->Enable (e);
 563         _move_to_start_of_reel->Enable (e);
 564         _full_length->Enable (e);
 565         _trim_start->Enable (e);
 566         _trim_end->Enable (e);
 567         _play_length->Enable (e);
 568         _video_frame_rate->Enable (e);
 569
 570         shared_ptr<FilmViewer> fv = _viewer.lock ();
 571         DCPOMATIC_ASSERT (fv);
 572         DCPTime const ph = fv->position ();
 573         bool any_over_ph = false;
 574         BOOST_FOREACH (shared_ptr<const Content> i, _parent->selected ()) {
 575                 if (i->position() <= ph && ph < i->end(_parent->film())) {
 576                         any_over_ph = true;
 577                 }
 578         }
 579
 580         _trim_start_to_playhead->Enable (any_over_ph);
 581         _trim_end_to_playhead->Enable (any_over_ph);
 582 }
 583
 584 void
 585 TimingPanel::move_to_start_of_reel_clicked ()
 586 {
 587         /* Find common position of all selected content, if it exists */
 588
 589         optional<DCPTime> position;
 590         BOOST_FOREACH (shared_ptr<Content> i, _parent->selected ()) {
 591                 if (!position) {
 592                         position = i->position();
 593                 } else {
 594                         if (position.get() != i->position()) {
 595                                 position.reset ();
 596                                 break;
 597                         }
 598                 }
 599         }
 600
 601         MoveToDialog* d = new MoveToDialog (this, position, _parent->film());
 602
 603         if (d->ShowModal() == wxID_OK) {
 604                 BOOST_FOREACH (shared_ptr<Content> i, _parent->selected()) {
 605                         i->set_position (_parent->film(), d->position());
 606                 }
 607         }
 608         d->Destroy ();
 609 }