src/wx/screens_panel.cc

   1 /*
   2     Copyright (C) 2015-2022 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
  22 #include "cinema_dialog.h"
  23 #include "dcpomatic_button.h"
  24 #include "screen_dialog.h"
  25 #include "screens_panel.h"
  26 #include "wx_ptr.h"
  27 #include "wx_util.h"
  28 #include "lib/cinema.h"
  29 #include "lib/config.h"
  30 #include "lib/scope_guard.h"
  31 #include "lib/screen.h"
  32 #include "lib/timer.h"
  33
  34
  35 using std::cout;
  36 using std::list;
  37 using std::make_pair;
  38 using std::make_shared;
  39 using std::map;
  40 using std::pair;
  41 using std::shared_ptr;
  42 using std::string;
  43 using std::vector;
  44 using boost::optional;
  45 #if BOOST_VERSION >= 106100
  46 using namespace boost::placeholders;
  47 #endif
  48 using namespace dcpomatic;
  49
  50
  51 ScreensPanel::ScreensPanel (wxWindow* parent)
  52         : wxPanel (parent, wxID_ANY)
  53 {
  54         auto sizer = new wxBoxSizer (wxVERTICAL);
  55
  56         _search = new wxSearchCtrl (this, wxID_ANY, wxEmptyString, wxDefaultPosition, wxSize(200, search_ctrl_height()));
  57 #ifndef __WXGTK3__
  58         /* The cancel button seems to be strangely broken in GTK3; clicking on it twice sometimes works */
  59         _search->ShowCancelButton (true);
  60 #endif
  61         sizer->Add (_search, 0, wxBOTTOM, DCPOMATIC_SIZER_GAP);
  62
  63         auto targets = new wxBoxSizer (wxHORIZONTAL);
  64         _targets = new wxTreeListCtrl (this, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxTL_MULTIPLE | wxTL_3STATE | wxTL_NO_HEADER);
  65         _targets->AppendColumn (wxT("foo"));
  66
  67         targets->Add (_targets, 1, wxEXPAND | wxRIGHT, DCPOMATIC_SIZER_GAP);
  68
  69         add_cinemas ();
  70
  71         auto side_buttons = new wxBoxSizer (wxVERTICAL);
  72
  73         auto target_buttons = new wxBoxSizer (wxVERTICAL);
  74
  75         _add_cinema = new Button (this, _("Add Cinema..."));
  76         target_buttons->Add (_add_cinema, 1, wxEXPAND | wxBOTTOM, DCPOMATIC_BUTTON_STACK_GAP);
  77         _edit_cinema = new Button (this, _("Edit Cinema..."));
  78         target_buttons->Add (_edit_cinema, 1, wxEXPAND | wxBOTTOM, DCPOMATIC_BUTTON_STACK_GAP);
  79         _remove_cinema = new Button (this, _("Remove Cinema"));
  80         target_buttons->Add (_remove_cinema, 1, wxEXPAND | wxBOTTOM, DCPOMATIC_BUTTON_STACK_GAP);
  81         _add_screen = new Button (this, _("Add Screen..."));
  82         target_buttons->Add (_add_screen, 1, wxEXPAND | wxBOTTOM, DCPOMATIC_BUTTON_STACK_GAP);
  83         _edit_screen = new Button (this, _("Edit Screen..."));
  84         target_buttons->Add (_edit_screen, 1, wxEXPAND | wxBOTTOM, DCPOMATIC_BUTTON_STACK_GAP);
  85         _remove_screen = new Button (this, _("Remove Screen"));
  86         target_buttons->Add (_remove_screen, 1, wxEXPAND | wxBOTTOM, DCPOMATIC_BUTTON_STACK_GAP);
  87
  88         side_buttons->Add (target_buttons, 0, 0);
  89
  90         auto check_buttons = new wxBoxSizer (wxVERTICAL);
  91
  92         _check_all = new Button (this, _("Check all"));
  93         check_buttons->Add (_check_all, 1, wxEXPAND | wxBOTTOM, DCPOMATIC_BUTTON_STACK_GAP);
  94         _uncheck_all = new Button (this, _("Uncheck all"));
  95         check_buttons->Add (_uncheck_all, 1, wxEXPAND | wxBOTTOM, DCPOMATIC_BUTTON_STACK_GAP);
  96
  97         side_buttons->Add (check_buttons, 1, wxEXPAND | wxTOP, DCPOMATIC_BUTTON_STACK_GAP * 8);
  98
  99         targets->Add (side_buttons, 0, 0);
 100
 101         sizer->Add (targets, 1, wxEXPAND);
 102
 103         _search->Bind        (wxEVT_TEXT, boost::bind (&ScreensPanel::search_changed, this));
 104         _targets->Bind       (wxEVT_TREELIST_SELECTION_CHANGED, &ScreensPanel::selection_changed_shim, this);
 105         _targets->Bind       (wxEVT_TREELIST_ITEM_CHECKED, &ScreensPanel::checkbox_changed, this);
 106
 107         _add_cinema->Bind    (wxEVT_BUTTON, boost::bind (&ScreensPanel::add_cinema_clicked, this));
 108         _edit_cinema->Bind   (wxEVT_BUTTON, boost::bind (&ScreensPanel::edit_cinema_clicked, this));
 109         _remove_cinema->Bind (wxEVT_BUTTON, boost::bind (&ScreensPanel::remove_cinema_clicked, this));
 110
 111         _add_screen->Bind    (wxEVT_BUTTON, boost::bind (&ScreensPanel::add_screen_clicked, this));
 112         _edit_screen->Bind   (wxEVT_BUTTON, boost::bind (&ScreensPanel::edit_screen_clicked, this));
 113         _remove_screen->Bind (wxEVT_BUTTON, boost::bind (&ScreensPanel::remove_screen_clicked, this));
 114
 115         _check_all->Bind     (wxEVT_BUTTON, boost::bind(&ScreensPanel::check_all, this));
 116         _uncheck_all->Bind   (wxEVT_BUTTON, boost::bind(&ScreensPanel::uncheck_all, this));
 117
 118         SetSizer (sizer);
 119
 120         _config_connection = Config::instance()->Changed.connect(boost::bind(&ScreensPanel::config_changed, this, _1));
 121 }
 122
 123
 124 ScreensPanel::~ScreensPanel ()
 125 {
 126         _targets->Unbind (wxEVT_TREELIST_SELECTION_CHANGED, &ScreensPanel::selection_changed_shim, this);
 127         _targets->Unbind (wxEVT_TREELIST_ITEM_CHECKED, &ScreensPanel::checkbox_changed, this);
 128 }
 129
 130
 131 void
 132 ScreensPanel::check_all ()
 133 {
 134         for (auto cinema = _targets->GetFirstChild(_targets->GetRootItem()); cinema.IsOk();  cinema = _targets->GetNextSibling(cinema)) {
 135                 _targets->CheckItem(cinema, wxCHK_CHECKED);
 136                 for (auto screen = _targets->GetFirstChild(cinema); screen.IsOk(); screen = _targets->GetNextSibling(screen)) {
 137                         _targets->CheckItem(screen, wxCHK_CHECKED);
 138                         set_screen_checked(screen, true);
 139                 }
 140         }
 141 }
 142
 143
 144 void
 145 ScreensPanel::uncheck_all ()
 146 {
 147         for (auto cinema = _targets->GetFirstChild(_targets->GetRootItem()); cinema.IsOk();  cinema = _targets->GetNextSibling(cinema)) {
 148                 _targets->CheckItem(cinema, wxCHK_UNCHECKED);
 149                 for (auto screen = _targets->GetFirstChild(cinema); screen.IsOk(); screen = _targets->GetNextSibling(screen)) {
 150                         _targets->CheckItem(screen, wxCHK_UNCHECKED);
 151                         set_screen_checked(screen, false);
 152                 }
 153         }
 154 }
 155
 156
 157 void
 158 ScreensPanel::setup_sensitivity ()
 159 {
 160         bool const sc = _selected_cinemas.size() == 1;
 161         bool const ss = _selected_screens.size() == 1;
 162
 163         _edit_cinema->Enable (sc || ss);
 164         _remove_cinema->Enable (_selected_cinemas.size() >= 1);
 165
 166         _add_screen->Enable (sc || ss);
 167         _edit_screen->Enable (ss);
 168         _remove_screen->Enable (_selected_screens.size() >= 1);
 169 }
 170
 171
 172 void
 173 ScreensPanel::convert_to_lower(string& s)
 174 {
 175         transform(s.begin(), s.end(), s.begin(), ::tolower);
 176 }
 177
 178
 179 bool
 180 ScreensPanel::matches_search(shared_ptr<const Cinema> cinema, string lower_case_search)
 181 {
 182         if (lower_case_search.empty()) {
 183                 return true;
 184         }
 185
 186         auto name = cinema->name;
 187         convert_to_lower(name);
 188         return name.find(lower_case_search) != string::npos;
 189 }
 190
 191
 192 optional<wxTreeListItem>
 193 ScreensPanel::add_cinema (shared_ptr<Cinema> cinema, wxTreeListItem previous)
 194 {
 195         auto search = wx_to_std (_search->GetValue ());
 196         convert_to_lower(search);
 197         if (!matches_search(cinema, search)) {
 198                 return {};
 199         }
 200
 201         auto id = _targets->InsertItem(_targets->GetRootItem(), previous, std_to_wx(cinema->name));
 202
 203         _item_to_cinema[id] = cinema;
 204         _cinema_to_item[cinema] = id;
 205
 206         for (auto screen: cinema->screens()) {
 207                 add_screen (cinema, screen);
 208         }
 209
 210         return id;
 211 }
 212
 213
 214 optional<wxTreeListItem>
 215 ScreensPanel::add_screen (shared_ptr<Cinema> cinema, shared_ptr<Screen> screen)
 216 {
 217         auto item = cinema_to_item(cinema);
 218         if (!item) {
 219                 return {};
 220         }
 221
 222         auto id = _targets->AppendItem(*item, std_to_wx(screen->name));
 223
 224         _item_to_screen[id] = screen;
 225         _screen_to_item[screen] = id;
 226
 227         return item;
 228 }
 229
 230
 231 void
 232 ScreensPanel::add_cinema_clicked ()
 233 {
 234         auto dialog = make_wx<CinemaDialog>(GetParent(), _("Add Cinema"));
 235
 236         if (dialog->ShowModal() == wxID_OK) {
 237                 auto cinema = make_shared<Cinema>(dialog->name(), dialog->emails(), dialog->notes(), dialog->utc_offset_hour(), dialog->utc_offset_minute());
 238
 239                 auto cinemas = sorted_cinemas();
 240
 241                 try {
 242                         _ignore_cinemas_changed = true;
 243                         ScopeGuard sg = [this]() { _ignore_cinemas_changed = false; };
 244                         Config::instance()->add_cinema(cinema);
 245                 } catch (FileError& e) {
 246                         error_dialog(GetParent(), _("Could not write cinema details to the cinemas.xml file.  Check that the location of cinemas.xml is valid in DCP-o-matic's preferences."), std_to_wx(e.what()));
 247                         return;
 248                 }
 249
 250                 wxTreeListItem previous = wxTLI_FIRST;
 251                 bool found = false;
 252                 auto search = wx_to_std(_search->GetValue());
 253                 convert_to_lower(search);
 254                 for (auto existing_cinema: cinemas) {
 255                         if (!matches_search(existing_cinema, search)) {
 256                                 continue;
 257                         }
 258                         if (_collator.compare(dialog->name(), existing_cinema->name) < 0) {
 259                                 /* existing_cinema should be after the one we're inserting */
 260                                 found = true;
 261                                 break;
 262                         }
 263                         auto item = cinema_to_item(existing_cinema);
 264                         DCPOMATIC_ASSERT(item);
 265                         previous = *item;
 266                 }
 267
 268                 auto item = add_cinema(cinema, found ? previous : wxTLI_LAST);
 269
 270                 if (item) {
 271                         _targets->UnselectAll ();
 272                         _targets->Select (*item);
 273                 }
 274         }
 275
 276         selection_changed ();
 277 }
 278
 279
 280 shared_ptr<Cinema>
 281 ScreensPanel::cinema_for_operation () const
 282 {
 283         if (_selected_cinemas.size() == 1) {
 284                 return _selected_cinemas[0];
 285         } else if (_selected_screens.size() == 1) {
 286                 return _selected_screens[0]->cinema;
 287         }
 288
 289         return {};
 290 }
 291
 292
 293 void
 294 ScreensPanel::edit_cinema_clicked ()
 295 {
 296         auto cinema = cinema_for_operation ();
 297         if (!cinema) {
 298                 return;
 299         }
 300
 301         auto dialog = make_wx<CinemaDialog>(
 302                 GetParent(), _("Edit cinema"), cinema->name, cinema->emails, cinema->notes, cinema->utc_offset_hour(), cinema->utc_offset_minute()
 303                 );
 304
 305         if (dialog->ShowModal() == wxID_OK) {
 306                 cinema->name = dialog->name();
 307                 cinema->emails = dialog->emails();
 308                 cinema->notes = dialog->notes();
 309                 cinema->set_utc_offset_hour(dialog->utc_offset_hour());
 310                 cinema->set_utc_offset_minute(dialog->utc_offset_minute());
 311                 notify_cinemas_changed();
 312                 auto item = cinema_to_item(cinema);
 313                 DCPOMATIC_ASSERT(item);
 314                 _targets->SetItemText (*item, std_to_wx(dialog->name()));
 315         }
 316 }
 317
 318
 319 void
 320 ScreensPanel::remove_cinema_clicked ()
 321 {
 322         if (_selected_cinemas.size() == 1) {
 323                 if (!confirm_dialog(this, wxString::Format(_("Are you sure you want to remove the cinema '%s'?"), std_to_wx(_selected_cinemas[0]->name)))) {
 324                         return;
 325                 }
 326         } else {
 327                 if (!confirm_dialog(this, wxString::Format(_("Are you sure you want to remove %d cinemas?"), int(_selected_cinemas.size())))) {
 328                         return;
 329                 }
 330         }
 331
 332         for (auto const& cinema: _selected_cinemas) {
 333                 _ignore_cinemas_changed = true;
 334                 ScopeGuard sg = [this]() { _ignore_cinemas_changed = false; };
 335                 Config::instance()->remove_cinema(cinema);
 336                 auto item = cinema_to_item(cinema);
 337                 DCPOMATIC_ASSERT(item);
 338                 _targets->DeleteItem(*item);
 339         }
 340
 341         selection_changed ();
 342 }
 343
 344
 345 void
 346 ScreensPanel::add_screen_clicked ()
 347 {
 348         auto cinema = cinema_for_operation ();
 349         if (!cinema) {
 350                 return;
 351         }
 352
 353         auto dialog = make_wx<ScreenDialog>(GetParent(), _("Add Screen"));
 354
 355         if (dialog->ShowModal () != wxID_OK) {
 356                 return;
 357         }
 358
 359         for (auto screen: cinema->screens()) {
 360                 if (screen->name == dialog->name()) {
 361                         error_dialog (
 362                                 GetParent(),
 363                                 wxString::Format (
 364                                         _("You cannot add a screen called '%s' as the cinema already has a screen with this name."),
 365                                         std_to_wx(dialog->name()).data()
 366                                         )
 367                                 );
 368                         return;
 369                 }
 370         }
 371
 372         auto screen = std::make_shared<Screen>(dialog->name(), dialog->notes(), dialog->recipient(), dialog->recipient_file(), dialog->trusted_devices());
 373         cinema->add_screen (screen);
 374         notify_cinemas_changed();
 375
 376         auto id = add_screen (cinema, screen);
 377         if (id) {
 378                 _targets->Expand (id.get ());
 379         }
 380 }
 381
 382
 383 void
 384 ScreensPanel::edit_screen_clicked ()
 385 {
 386         if (_selected_screens.size() != 1) {
 387                 return;
 388         }
 389
 390         auto edit_screen = _selected_screens[0];
 391
 392         auto dialog = make_wx<ScreenDialog>(
 393                 GetParent(), _("Edit screen"),
 394                 edit_screen->name,
 395                 edit_screen->notes,
 396                 edit_screen->recipient,
 397                 edit_screen->recipient_file,
 398                 edit_screen->trusted_devices
 399                 );
 400
 401         if (dialog->ShowModal() != wxID_OK) {
 402                 return;
 403         }
 404
 405         auto cinema = edit_screen->cinema;
 406         for (auto screen: cinema->screens()) {
 407                 if (screen != edit_screen && screen->name == dialog->name()) {
 408                         error_dialog (
 409                                 GetParent(),
 410                                 wxString::Format (
 411                                         _("You cannot change this screen's name to '%s' as the cinema already has a screen with this name."),
 412                                         std_to_wx(dialog->name()).data()
 413                                         )
 414                                 );
 415                         return;
 416                 }
 417         }
 418
 419         edit_screen->name = dialog->name();
 420         edit_screen->notes = dialog->notes();
 421         edit_screen->recipient = dialog->recipient();
 422         edit_screen->recipient_file = dialog->recipient_file();
 423         edit_screen->trusted_devices = dialog->trusted_devices();
 424         notify_cinemas_changed();
 425
 426         auto item = screen_to_item(edit_screen);
 427         DCPOMATIC_ASSERT (item);
 428         _targets->SetItemText (*item, std_to_wx(dialog->name()));
 429 }
 430
 431
 432 void
 433 ScreensPanel::remove_screen_clicked ()
 434 {
 435         if (_selected_screens.size() == 1) {
 436                 if (!confirm_dialog(this, wxString::Format(_("Are you sure you want to remove the screen '%s'?"), std_to_wx(_selected_screens[0]->name)))) {
 437                         return;
 438                 }
 439         } else {
 440                 if (!confirm_dialog(this, wxString::Format(_("Are you sure you want to remove %d screens?"), int(_selected_screens.size())))) {
 441                         return;
 442                 }
 443         }
 444
 445         for (auto const& screen: _selected_screens) {
 446                 screen->cinema->remove_screen(screen);
 447                 auto item = screen_to_item(screen);
 448                 DCPOMATIC_ASSERT(item);
 449                 _targets->DeleteItem(*item);
 450         }
 451
 452         /* This is called by the signal on Linux, but not it seems on Windows, so we call it ourselves
 453          * as well.
 454          */
 455         selection_changed();
 456         notify_cinemas_changed();
 457 }
 458
 459
 460 vector<shared_ptr<Screen>>
 461 ScreensPanel::screens () const
 462 {
 463         vector<shared_ptr<Screen>> output;
 464         std::copy (_checked_screens.begin(), _checked_screens.end(), std::back_inserter(output));
 465         return output;
 466 }
 467
 468
 469 void
 470 ScreensPanel::selection_changed_shim (wxTreeListEvent &)
 471 {
 472         selection_changed ();
 473 }
 474
 475
 476 void
 477 ScreensPanel::selection_changed ()
 478 {
 479         if (_ignore_selection_change) {
 480                 return;
 481         }
 482
 483         wxTreeListItems selection;
 484         _targets->GetSelections (selection);
 485
 486         _selected_cinemas.clear ();
 487         _selected_screens.clear ();
 488
 489         for (size_t i = 0; i < selection.size(); ++i) {
 490                 if (auto cinema = item_to_cinema(selection[i])) {
 491                         _selected_cinemas.push_back(cinema);
 492                 }
 493                 if (auto screen = item_to_screen(selection[i])) {
 494                         _selected_screens.push_back(screen);
 495                 }
 496         }
 497
 498         setup_sensitivity ();
 499 }
 500
 501
 502 list<shared_ptr<Cinema>>
 503 ScreensPanel::sorted_cinemas() const
 504 {
 505         auto cinemas = Config::instance()->cinemas();
 506
 507         cinemas.sort(
 508                 [this](shared_ptr<Cinema> a, shared_ptr<Cinema> b) { return _collator.compare(a->name, b->name) < 0; }
 509                 );
 510
 511         return cinemas;
 512 }
 513
 514
 515 void
 516 ScreensPanel::add_cinemas ()
 517 {
 518         for (auto cinema: sorted_cinemas()) {
 519                 add_cinema (cinema, wxTLI_LAST);
 520         }
 521 }
 522
 523
 524 void
 525 ScreensPanel::clear_and_re_add()
 526 {
 527         _targets->DeleteAllItems ();
 528
 529         _item_to_cinema.clear ();
 530         _cinema_to_item.clear ();
 531         _item_to_screen.clear ();
 532         _screen_to_item.clear ();
 533
 534         add_cinemas ();
 535 }
 536
 537
 538 void
 539 ScreensPanel::search_changed ()
 540 {
 541         clear_and_re_add();
 542
 543         _ignore_selection_change = true;
 544
 545         for (auto const& selection: _selected_cinemas) {
 546                 if (auto item = cinema_to_item(selection)) {
 547                         _targets->Select (*item);
 548                 }
 549         }
 550
 551         for (auto const& selection: _selected_screens) {
 552                 if (auto item = screen_to_item(selection)) {
 553                         _targets->Select (*item);
 554                 }
 555         }
 556
 557         _ignore_selection_change = false;
 558
 559         _ignore_check_change = true;
 560
 561         for (auto const& checked: _checked_screens) {
 562                 if (auto item = screen_to_item(checked)) {
 563                         _targets->CheckItem(*item, wxCHK_CHECKED);
 564                         setup_cinema_checked_state(*item);
 565                 }
 566         }
 567
 568         _ignore_check_change = false;
 569 }
 570
 571
 572 void
 573 ScreensPanel::set_screen_checked (wxTreeListItem item, bool checked)
 574 {
 575         auto screen = item_to_screen(item);
 576         DCPOMATIC_ASSERT(screen);
 577         if (checked) {
 578                 _checked_screens.insert(screen);
 579         } else {
 580                 _checked_screens.erase(screen);
 581         }
 582 }
 583
 584
 585 void
 586 ScreensPanel::setup_cinema_checked_state (wxTreeListItem screen)
 587 {
 588         auto cinema = _targets->GetItemParent(screen);
 589         DCPOMATIC_ASSERT (cinema.IsOk());
 590         int checked = 0;
 591         int unchecked = 0;
 592         for (auto child = _targets->GetFirstChild(cinema); child.IsOk(); child = _targets->GetNextSibling(child)) {
 593                 if (_targets->GetCheckedState(child) == wxCHK_CHECKED) {
 594                     ++checked;
 595                 } else {
 596                     ++unchecked;
 597                 }
 598         }
 599         if (checked == 0) {
 600                 _targets->CheckItem(cinema, wxCHK_UNCHECKED);
 601         } else if (unchecked == 0) {
 602                 _targets->CheckItem(cinema, wxCHK_CHECKED);
 603         } else {
 604                 _targets->CheckItem(cinema, wxCHK_UNDETERMINED);
 605         }
 606 }
 607
 608
 609 void
 610 ScreensPanel::checkbox_changed (wxTreeListEvent& ev)
 611 {
 612         if (_ignore_check_change) {
 613                 return;
 614         }
 615
 616         if (item_to_cinema(ev.GetItem())) {
 617                 /* Cinema: check/uncheck all children */
 618                 auto const checked = _targets->GetCheckedState(ev.GetItem());
 619                 for (auto child = _targets->GetFirstChild(ev.GetItem()); child.IsOk(); child = _targets->GetNextSibling(child)) {
 620                         _targets->CheckItem(child, checked);
 621                         set_screen_checked(child, checked);
 622                 }
 623         } else {
 624                 set_screen_checked(ev.GetItem(), _targets->GetCheckedState(ev.GetItem()));
 625                 setup_cinema_checked_state(ev.GetItem());
 626         }
 627
 628         ScreensChanged ();
 629 }
 630
 631
 632 shared_ptr<Cinema>
 633 ScreensPanel::item_to_cinema (wxTreeListItem item) const
 634 {
 635         auto iter = _item_to_cinema.find (item);
 636         if (iter == _item_to_cinema.end()) {
 637                 return {};
 638         }
 639
 640         return iter->second;
 641 }
 642
 643
 644 shared_ptr<Screen>
 645 ScreensPanel::item_to_screen (wxTreeListItem item) const
 646 {
 647         auto iter = _item_to_screen.find (item);
 648         if (iter == _item_to_screen.end()) {
 649                 return {};
 650         }
 651
 652         return iter->second;
 653 }
 654
 655
 656 optional<wxTreeListItem>
 657 ScreensPanel::cinema_to_item (shared_ptr<Cinema> cinema) const
 658 {
 659         auto iter = _cinema_to_item.find (cinema);
 660         if (iter == _cinema_to_item.end()) {
 661                 return {};
 662         }
 663
 664         return iter->second;
 665 }
 666
 667
 668 optional<wxTreeListItem>
 669 ScreensPanel::screen_to_item (shared_ptr<Screen> screen) const
 670 {
 671         auto iter = _screen_to_item.find (screen);
 672         if (iter == _screen_to_item.end()) {
 673                 return {};
 674         }
 675
 676         return iter->second;
 677 }
 678
 679
 680 bool
 681 ScreensPanel::notify_cinemas_changed()
 682 {
 683         _ignore_cinemas_changed = true;
 684         ScopeGuard sg = [this]() { _ignore_cinemas_changed = false; };
 685
 686         try {
 687                 Config::instance()->changed(Config::CINEMAS);
 688         } catch (FileError& e) {
 689                 error_dialog(GetParent(), _("Could not write cinema details to the cinemas.xml file.  Check that the location of cinemas.xml is valid in DCP-o-matic's preferences."), std_to_wx(e.what()));
 690                 return false;
 691         }
 692
 693         return true;
 694 }
 695
 696
 697 void
 698 ScreensPanel::config_changed(Config::Property property)
 699 {
 700         if (property == Config::Property::CINEMAS && !_ignore_cinemas_changed) {
 701                 clear_and_re_add();
 702         }
 703 }