git.sesse.net Git - nageru/blob - midi_mapping_dialog.cpp

   1 #include "midi_mapping_dialog.h"
   2
   3 #include "midi_mapper.h"
   4 #include "midi_mapping.pb.h"
   5 #include "post_to_main_thread.h"
   6 #include "ui_midi_mapping.h"
   7
   8 #include <QComboBox>
   9 #include <QFileDialog>
  10 #include <QMessageBox>
  11 #include <QSpinBox>
  12
  13 #include <algorithm>
  14 #include <string>
  15
  16 using namespace google::protobuf;
  17 using namespace std;
  18
  19 vector<MIDIMappingDialog::Control> per_bus_controllers = {
  20         { "Treble",                   MIDIMappingBusProto::kTrebleFieldNumber, MIDIMappingProto::kTrebleBankFieldNumber },
  21         { "Mid",                      MIDIMappingBusProto::kMidFieldNumber,    MIDIMappingProto::kMidBankFieldNumber },
  22         { "Bass",                     MIDIMappingBusProto::kBassFieldNumber,   MIDIMappingProto::kBassBankFieldNumber },
  23         { "Gain",                     MIDIMappingBusProto::kGainFieldNumber,   MIDIMappingProto::kGainBankFieldNumber },
  24         { "Compressor threshold",     MIDIMappingBusProto::kCompressorThresholdFieldNumber,
  25                                       MIDIMappingProto::kCompressorThresholdBankFieldNumber},
  26         { "Fader",                    MIDIMappingBusProto::kFaderFieldNumber,  MIDIMappingProto::kFaderBankFieldNumber }
  27 };
  28 vector<MIDIMappingDialog::Control> per_bus_buttons = {
  29         { "Toggle locut",             MIDIMappingBusProto::kToggleLocutFieldNumber,
  30                                       MIDIMappingProto::kToggleLocutBankFieldNumber },
  31         { "Togle auto gain staging",  MIDIMappingBusProto::kToggleAutoGainStagingFieldNumber,
  32                                       MIDIMappingProto::kToggleAutoGainStagingBankFieldNumber },
  33         { "Togle compressor",         MIDIMappingBusProto::kToggleCompressorFieldNumber,
  34                                       MIDIMappingProto::kToggleCompressorBankFieldNumber },
  35         { "Clear peak",               MIDIMappingBusProto::kClearPeakFieldNumber,
  36                                       MIDIMappingProto::kClearPeakBankFieldNumber }
  37 };
  38 vector<MIDIMappingDialog::Control> global_controllers = {
  39         { "Locut cutoff",             MIDIMappingBusProto::kLocutFieldNumber,  MIDIMappingProto::kLocutBankFieldNumber },
  40         { "Limiter threshold",        MIDIMappingBusProto::kLimiterThresholdFieldNumber,
  41                                       MIDIMappingProto::kLimiterThresholdBankFieldNumber },
  42         { "Makeup gain",              MIDIMappingBusProto::kMakeupGainFieldNumber,
  43                                       MIDIMappingProto::kMakeupGainBankFieldNumber }
  44 };
  45 vector<MIDIMappingDialog::Control> global_buttons = {
  46         { "Previous bank",            MIDIMappingBusProto::kPrevBankFieldNumber, 0 },
  47         { "Next bank",                MIDIMappingBusProto::kNextBankFieldNumber, 0 },
  48         { "Select bank 1",            MIDIMappingBusProto::kSelectBank1FieldNumber, 0 },
  49         { "Select bank 2",            MIDIMappingBusProto::kSelectBank2FieldNumber, 0 },
  50         { "Select bank 3",            MIDIMappingBusProto::kSelectBank3FieldNumber, 0 },
  51         { "Select bank 4",            MIDIMappingBusProto::kSelectBank4FieldNumber, 0 },
  52         { "Select bank 5",            MIDIMappingBusProto::kSelectBank5FieldNumber, 0 }
  53 };
  54
  55 namespace {
  56
  57 int get_bank(const MIDIMappingProto &mapping_proto, int bank_field_number, int default_value)
  58 {
  59         const FieldDescriptor *bank_descriptor = mapping_proto.GetDescriptor()->FindFieldByNumber(bank_field_number);
  60         const Reflection *reflection = mapping_proto.GetReflection();
  61         if (!reflection->HasField(mapping_proto, bank_descriptor)) {
  62                 return default_value;
  63         }
  64         return reflection->GetInt32(mapping_proto, bank_descriptor);
  65 }
  66
  67 int get_controller_mapping(const MIDIMappingProto &mapping_proto, size_t bus_idx, int field_number, int default_value)
  68 {
  69         if (bus_idx >= size_t(mapping_proto.bus_mapping_size())) {
  70                 return default_value;
  71         }
  72
  73         const MIDIMappingBusProto &bus_mapping = mapping_proto.bus_mapping(bus_idx);
  74         const FieldDescriptor *descriptor = bus_mapping.GetDescriptor()->FindFieldByNumber(field_number);
  75         const Reflection *bus_reflection = bus_mapping.GetReflection();
  76         if (!bus_reflection->HasField(bus_mapping, descriptor)) {
  77                 return default_value;
  78         }
  79         const MIDIControllerProto &controller_proto =
  80                 static_cast<const MIDIControllerProto &>(bus_reflection->GetMessage(bus_mapping, descriptor));
  81         return controller_proto.controller_number();
  82 }
  83
  84 int get_button_mapping(const MIDIMappingProto &mapping_proto, size_t bus_idx, int field_number, int default_value)
  85 {
  86         if (bus_idx >= size_t(mapping_proto.bus_mapping_size())) {
  87                 return default_value;
  88         }
  89
  90         const MIDIMappingBusProto &bus_mapping = mapping_proto.bus_mapping(bus_idx);
  91         const FieldDescriptor *descriptor = bus_mapping.GetDescriptor()->FindFieldByNumber(field_number);
  92         const Reflection *bus_reflection = bus_mapping.GetReflection();
  93         if (!bus_reflection->HasField(bus_mapping, descriptor)) {
  94                 return default_value;
  95         }
  96         const MIDIButtonProto &bus_proto =
  97                 static_cast<const MIDIButtonProto &>(bus_reflection->GetMessage(bus_mapping, descriptor));
  98         return bus_proto.note_number();
  99 }
 100
 101 }  // namespace
 102
 103 MIDIMappingDialog::MIDIMappingDialog(MIDIMapper *mapper)
 104         : ui(new Ui::MIDIMappingDialog),
 105           mapper(mapper)
 106 {
 107         ui->setupUi(this);
 108
 109         const MIDIMappingProto mapping_proto = mapper->get_current_mapping();  // Take a copy.
 110         old_receiver = mapper->set_receiver(this);
 111
 112         QStringList labels;
 113         labels << "";
 114         labels << "Controller bank";
 115         for (unsigned bus_idx = 0; bus_idx < num_buses; ++bus_idx) {
 116                 char buf[256];
 117                 snprintf(buf, sizeof(buf), "Bus %d", bus_idx + 1);
 118                 labels << buf;
 119         }
 120         labels << "";
 121         ui->treeWidget->setColumnCount(num_buses + 3);
 122         ui->treeWidget->setHeaderLabels(labels);
 123
 124         add_controls("Per-bus controllers", ControlType::CONTROLLER, SpinnerGroup::PER_BUS_CONTROLLERS, mapping_proto, per_bus_controllers);
 125         add_controls("Per-bus buttons", ControlType::BUTTON, SpinnerGroup::PER_BUS_BUTTONS, mapping_proto, per_bus_buttons);
 126         add_controls("Global controllers", ControlType::CONTROLLER, SpinnerGroup::GLOBAL_CONTROLLERS, mapping_proto, global_controllers);
 127         add_controls("Global buttons", ControlType::BUTTON, SpinnerGroup::GLOBAL_BUTTONS, mapping_proto, global_buttons);
 128         fill_controls_from_mapping(mapping_proto);
 129
 130         // Auto-resize every column but the last.
 131         for (unsigned column_idx = 0; column_idx < num_buses + 3; ++column_idx) {
 132                 ui->treeWidget->resizeColumnToContents(column_idx);
 133         }
 134
 135         connect(ui->guess_bus_button, &QPushButton::clicked,
 136                 bind(&MIDIMappingDialog::guess_clicked, this, false));
 137         connect(ui->guess_group_button, &QPushButton::clicked,
 138                 bind(&MIDIMappingDialog::guess_clicked, this, true));
 139         connect(ui->ok_cancel_buttons, &QDialogButtonBox::accepted, this, &MIDIMappingDialog::ok_clicked);
 140         connect(ui->ok_cancel_buttons, &QDialogButtonBox::rejected, this, &MIDIMappingDialog::cancel_clicked);
 141         connect(ui->save_button, &QPushButton::clicked, this, &MIDIMappingDialog::save_clicked);
 142         connect(ui->load_button, &QPushButton::clicked, this, &MIDIMappingDialog::load_clicked);
 143
 144         update_guess_button_state();
 145 }
 146
 147 MIDIMappingDialog::~MIDIMappingDialog()
 148 {
 149         mapper->set_receiver(old_receiver);
 150         mapper->refresh_highlights();
 151 }
 152
 153 bool MIDIMappingDialog::eventFilter(QObject *obj, QEvent *event)
 154 {
 155         if (event->type() == QEvent::FocusIn ||
 156             event->type() == QEvent::FocusOut) {
 157                 // We ignore the guess buttons themselves; it should be allowed
 158                 // to navigate from a spinner to focus on a button (to click it).
 159                 if (obj != ui->guess_bus_button && obj != ui->guess_group_button) {
 160                         update_guess_button_state();
 161                 }
 162         }
 163         return false;
 164 }
 165
 166 void MIDIMappingDialog::guess_clicked(bool limit_to_group)
 167 {
 168         FocusInfo focus = find_focus();
 169         if (focus.bus_idx == -1) {
 170                 // The guess button probably took the focus away from us.
 171                 focus = last_focus;
 172         }
 173         assert(focus.bus_idx != -1);  // The button should have been disabled.
 174         pair<int, int> bus_and_offset = guess_offset(focus.bus_idx, limit_to_group ? focus.spinner_group : SpinnerGroup::ALL_GROUPS);
 175         const int source_bus_idx = bus_and_offset.first;
 176         const int offset = bus_and_offset.second;
 177         assert(source_bus_idx != -1);  // The button should have been disabled.
 178
 179         for (const auto &field_number_and_spinner : spinners[focus.bus_idx]) {
 180                 int field_number = field_number_and_spinner.first;
 181                 QSpinBox *spinner = field_number_and_spinner.second.spinner;
 182                 SpinnerGroup this_spinner_group = field_number_and_spinner.second.group;
 183
 184                 if (limit_to_group && this_spinner_group != focus.spinner_group) {
 185                         continue;
 186                 }
 187
 188                 assert(spinners[source_bus_idx].count(field_number));
 189                 QSpinBox *source_spinner = spinners[source_bus_idx][field_number].spinner;
 190                 assert(spinners[source_bus_idx][field_number].group == this_spinner_group);
 191
 192                 if (source_spinner->value() != 0) {
 193                         spinner->setValue(source_spinner->value() + offset);
 194                 }
 195         }
 196
 197         // See if we can find a “next” bus to move the focus to.
 198         const int next_bus_idx = focus.bus_idx + (focus.bus_idx - source_bus_idx);  // Note: Could become e.g. -1.
 199         for (const InstantiatedSpinner &is : controller_spinners) {
 200                 if (int(is.bus_idx) == next_bus_idx && is.field_number == focus.field_number) {
 201                         is.spinner->setFocus();
 202                 }
 203         }
 204         for (const InstantiatedSpinner &is : button_spinners) {
 205                 if (int(is.bus_idx) == next_bus_idx && is.field_number == focus.field_number) {
 206                         is.spinner->setFocus();
 207                 }
 208         }
 209 }
 210
 211 void MIDIMappingDialog::ok_clicked()
 212 {
 213         unique_ptr<MIDIMappingProto> new_mapping = construct_mapping_proto_from_ui();
 214         mapper->set_midi_mapping(*new_mapping);
 215         mapper->set_receiver(old_receiver);
 216         accept();
 217 }
 218
 219 void MIDIMappingDialog::cancel_clicked()
 220 {
 221         mapper->set_receiver(old_receiver);
 222         reject();
 223 }
 224
 225 void MIDIMappingDialog::save_clicked()
 226 {
 227         unique_ptr<MIDIMappingProto> new_mapping = construct_mapping_proto_from_ui();
 228         QString filename = QFileDialog::getSaveFileName(this,
 229                 "Save MIDI mapping", QString(), tr("Mapping files (*.midimapping)"));
 230         if (!filename.endsWith(".midimapping")) {
 231                 filename += ".midimapping";
 232         }
 233         if (!save_midi_mapping_to_file(*new_mapping, filename.toStdString())) {
 234                 QMessageBox box;
 235                 box.setText("Could not save mapping to '" + filename + "'. Check that you have the right permissions and try again.");
 236                 box.exec();
 237         }
 238 }
 239
 240 void MIDIMappingDialog::load_clicked()
 241 {
 242         QString filename = QFileDialog::getOpenFileName(this,
 243                 "Load MIDI mapping", QString(), tr("Mapping files (*.midimapping)"));
 244         MIDIMappingProto new_mapping;
 245         if (!load_midi_mapping_from_file(filename.toStdString(), &new_mapping)) {
 246                 QMessageBox box;
 247                 box.setText("Could not load mapping from '" + filename + "'. Check that the file exists, has the right permissions and is valid.");
 248                 box.exec();
 249                 return;
 250         }
 251
 252         fill_controls_from_mapping(new_mapping);
 253 }
 254
 255 namespace {
 256
 257 template<class T>
 258 T *get_mutable_bus_message(MIDIMappingProto *mapping_proto, unsigned bus_idx, int field_number)
 259 {
 260         while (size_t(mapping_proto->bus_mapping_size()) <= bus_idx) {
 261                 mapping_proto->add_bus_mapping();
 262         }
 263
 264         MIDIMappingBusProto *bus_mapping = mapping_proto->mutable_bus_mapping(bus_idx);
 265         const FieldDescriptor *descriptor = bus_mapping->GetDescriptor()->FindFieldByNumber(field_number);
 266         const Reflection *bus_reflection = bus_mapping->GetReflection();
 267         return static_cast<T *>(bus_reflection->MutableMessage(bus_mapping, descriptor));
 268 }
 269
 270 }  // namespace
 271
 272 unique_ptr<MIDIMappingProto> MIDIMappingDialog::construct_mapping_proto_from_ui()
 273 {
 274         unique_ptr<MIDIMappingProto> mapping_proto(new MIDIMappingProto);
 275         for (const InstantiatedSpinner &is : controller_spinners) {
 276                 const int val = is.spinner->value();
 277                 if (val == 0) {
 278                         continue;
 279                 }
 280
 281                 MIDIControllerProto *controller_proto =
 282                         get_mutable_bus_message<MIDIControllerProto>(mapping_proto.get(), is.bus_idx, is.field_number);
 283                 controller_proto->set_controller_number(val);
 284         }
 285         for (const InstantiatedSpinner &is : button_spinners) {
 286                 const int val = is.spinner->value();
 287                 if (val == 0) {
 288                         continue;
 289                 }
 290
 291                 MIDIButtonProto *button_proto =
 292                         get_mutable_bus_message<MIDIButtonProto>(mapping_proto.get(), is.bus_idx, is.field_number);
 293                 button_proto->set_note_number(val);
 294         }
 295         int highest_bank_used = 0;  // 1-indexed.
 296         for (const InstantiatedComboBox &ic : bank_combo_boxes) {
 297                 const int val = ic.combo_box->currentIndex();
 298                 highest_bank_used = std::max(highest_bank_used, val);
 299                 if (val == 0) {
 300                         continue;
 301                 }
 302
 303                 const FieldDescriptor *descriptor = mapping_proto->GetDescriptor()->FindFieldByNumber(ic.field_number);
 304                 const Reflection *bus_reflection = mapping_proto->GetReflection();
 305                 bus_reflection->SetInt32(mapping_proto.get(), descriptor, val - 1);
 306         }
 307         mapping_proto->set_num_controller_banks(highest_bank_used);
 308         return mapping_proto;
 309 }
 310
 311 void MIDIMappingDialog::add_bank_selector(QTreeWidgetItem *item, const MIDIMappingProto &mapping_proto, int bank_field_number)
 312 {
 313         if (bank_field_number == 0) {
 314                 return;
 315         }
 316         QComboBox *bank_selector = new QComboBox(this);
 317         bank_selector->addItems(QStringList() << "" << "Bank 1" << "Bank 2" << "Bank 3" << "Bank 4" << "Bank 5");
 318         bank_selector->setAutoFillBackground(true);
 319
 320         bank_combo_boxes.push_back(InstantiatedComboBox{ bank_selector, bank_field_number });
 321
 322         ui->treeWidget->setItemWidget(item, 1, bank_selector);
 323 }
 324
 325 void MIDIMappingDialog::add_controls(const string &heading,
 326                                      MIDIMappingDialog::ControlType control_type,
 327                                      MIDIMappingDialog::SpinnerGroup spinner_group,
 328                                      const MIDIMappingProto &mapping_proto,
 329                                      const vector<MIDIMappingDialog::Control> &controls)
 330 {
 331         QTreeWidgetItem *heading_item = new QTreeWidgetItem(ui->treeWidget);
 332         heading_item->setText(0, QString::fromStdString(heading));
 333         heading_item->setFirstColumnSpanned(true);
 334         heading_item->setExpanded(true);
 335         for (const Control &control : controls) {
 336                 QTreeWidgetItem *item = new QTreeWidgetItem(heading_item);
 337                 heading_item->addChild(item);
 338                 add_bank_selector(item, mapping_proto, control.bank_field_number);
 339                 item->setText(0, QString::fromStdString(control.label + "   "));
 340
 341                 for (unsigned bus_idx = 0; bus_idx < num_buses; ++bus_idx) {
 342                         QSpinBox *spinner = new QSpinBox(this);
 343                         spinner->setRange(0, 127);
 344                         spinner->setAutoFillBackground(true);
 345                         spinner->setSpecialValueText("\u200d");  // Zero-width joiner (ie., empty).
 346                         spinner->installEventFilter(this);  // So we know when the focus changes.
 347                         ui->treeWidget->setItemWidget(item, bus_idx + 2, spinner);
 348
 349                         if (control_type == ControlType::CONTROLLER) {
 350                                 controller_spinners.push_back(InstantiatedSpinner{ spinner, bus_idx, spinner_group, control.field_number });
 351                         } else {
 352                                 assert(control_type == ControlType::BUTTON);
 353                                 button_spinners.push_back(InstantiatedSpinner{ spinner, bus_idx, spinner_group, control.field_number });
 354                         }
 355                         spinners[bus_idx][control.field_number] = SpinnerAndGroup{ spinner, spinner_group };
 356                         connect(spinner, static_cast<void(QSpinBox::*)(int)>(&QSpinBox::valueChanged),
 357                                 bind(&MIDIMappingDialog::update_guess_button_state, this));
 358                 }
 359         }
 360         ui->treeWidget->addTopLevelItem(heading_item);
 361 }
 362
 363 void MIDIMappingDialog::fill_controls_from_mapping(const MIDIMappingProto &mapping_proto)
 364 {
 365         for (const InstantiatedSpinner &is : controller_spinners) {
 366                 is.spinner->setValue(get_controller_mapping(mapping_proto, is.bus_idx, is.field_number, 0));
 367         }
 368         for (const InstantiatedSpinner &is : button_spinners) {
 369                 is.spinner->setValue(get_button_mapping(mapping_proto, is.bus_idx, is.field_number, 0));
 370         }
 371         for (const InstantiatedComboBox &ic : bank_combo_boxes) {
 372                 ic.combo_box->setCurrentIndex(get_bank(mapping_proto, ic.field_number, -1) + 1);
 373         }
 374 }
 375
 376 void MIDIMappingDialog::controller_changed(unsigned controller)
 377 {
 378         for (const InstantiatedSpinner &is : controller_spinners) {
 379                 if (is.spinner->hasFocus()) {
 380                         is.spinner->setValue(controller);
 381                         is.spinner->selectAll();
 382                 }
 383         }
 384 }
 385
 386 void MIDIMappingDialog::note_on(unsigned note)
 387 {
 388         for (const InstantiatedSpinner &is : button_spinners) {
 389                 if (is.spinner->hasFocus()) {
 390                         is.spinner->setValue(note);
 391                         is.spinner->selectAll();
 392                 }
 393         }
 394 }
 395
 396 pair<int, int> MIDIMappingDialog::guess_offset(unsigned bus_idx, MIDIMappingDialog::SpinnerGroup spinner_group)
 397 {
 398         constexpr pair<int, int> not_found(-1, 0);
 399
 400         if (bus_is_empty(bus_idx, spinner_group)) {
 401                 return not_found;
 402         }
 403
 404         // See if we can find a non-empty bus to source from (prefer from the left).
 405         unsigned source_bus_idx;
 406         if (bus_idx > 0 && !bus_is_empty(bus_idx - 1, spinner_group)) {
 407                 source_bus_idx = bus_idx - 1;
 408         } else if (bus_idx < num_buses - 1 && !bus_is_empty(bus_idx + 1, spinner_group)) {
 409                 source_bus_idx = bus_idx + 1;
 410         } else {
 411                 return not_found;
 412         }
 413
 414         // See if we can find a consistent offset.
 415         bool found_offset = false;
 416         int offset = 0;
 417         int minimum_allowed_offset = numeric_limits<int>::min();
 418         int maximum_allowed_offset = numeric_limits<int>::max();
 419         for (const auto &field_number_and_spinner : spinners[bus_idx]) {
 420                 int field_number = field_number_and_spinner.first;
 421                 QSpinBox *spinner = field_number_and_spinner.second.spinner;
 422                 SpinnerGroup this_spinner_group = field_number_and_spinner.second.group;
 423                 assert(spinners[source_bus_idx].count(field_number));
 424                 QSpinBox *source_spinner = spinners[source_bus_idx][field_number].spinner;
 425                 assert(spinners[source_bus_idx][field_number].group == this_spinner_group);
 426
 427                 if (spinner_group != SpinnerGroup::ALL_GROUPS &&
 428                     spinner_group != this_spinner_group) {
 429                         continue;
 430                 }
 431                 if (spinner->value() == 0) {
 432                         if (source_spinner->value() != 0) {
 433                                 // If the source value is e.g. 3, offset can't be less than -2 or larger than 124.
 434                                 // Otherwise, we'd extrapolate values outside [1..127].
 435                                 minimum_allowed_offset = max(minimum_allowed_offset, 1 - source_spinner->value());
 436                                 maximum_allowed_offset = min(maximum_allowed_offset, 127 - source_spinner->value());
 437                         }
 438                         continue;
 439                 }
 440                 if (source_spinner->value() == 0) {
 441                         // The bus has a controller set that the source bus doesn't set.
 442                         return not_found;
 443                 }
 444
 445                 int candidate_offset = spinner->value() - source_spinner->value();
 446                 if (!found_offset) {
 447                         offset = candidate_offset;
 448                         found_offset = true;
 449                 } else if (candidate_offset != offset) {
 450                         return not_found;
 451                 }
 452         }
 453
 454         if (!found_offset) {
 455                 // Given that the bus wasn't empty, this shouldn't happen.
 456                 assert(false);
 457                 return not_found;
 458         }
 459
 460         if (offset < minimum_allowed_offset || offset > maximum_allowed_offset) {
 461                 return not_found;
 462         }
 463         return make_pair(source_bus_idx, offset);
 464 }
 465
 466 bool MIDIMappingDialog::bus_is_empty(unsigned bus_idx, SpinnerGroup spinner_group)
 467 {
 468         for (const auto &field_number_and_spinner : spinners[bus_idx]) {
 469                 QSpinBox *spinner = field_number_and_spinner.second.spinner;
 470                 SpinnerGroup this_spinner_group = field_number_and_spinner.second.group;
 471                 if (spinner_group != SpinnerGroup::ALL_GROUPS &&
 472                     spinner_group != this_spinner_group) {
 473                         continue;
 474                 }
 475                 if (spinner->value() != 0) {
 476                         return false;
 477                 }
 478         }
 479         return true;
 480 }
 481
 482 void MIDIMappingDialog::update_guess_button_state()
 483 {
 484         FocusInfo focus = find_focus();
 485         if (focus.bus_idx < 0) {
 486                 return;
 487         }
 488         {
 489                 pair<int, int> bus_and_offset = guess_offset(focus.bus_idx, SpinnerGroup::ALL_GROUPS);
 490                 ui->guess_bus_button->setEnabled(bus_and_offset.first != -1);
 491         }
 492         {
 493                 pair<int, int> bus_and_offset = guess_offset(focus.bus_idx, focus.spinner_group);
 494                 ui->guess_group_button->setEnabled(bus_and_offset.first != -1);
 495         }
 496         last_focus = focus;
 497 }
 498
 499 MIDIMappingDialog::FocusInfo MIDIMappingDialog::find_focus() const
 500 {
 501         for (const InstantiatedSpinner &is : controller_spinners) {
 502                 if (is.spinner->hasFocus()) {
 503                         return FocusInfo{ int(is.bus_idx), is.spinner_group, is.field_number };
 504                 }
 505         }
 506         for (const InstantiatedSpinner &is : button_spinners) {
 507                 if (is.spinner->hasFocus()) {
 508                         return FocusInfo{ int(is.bus_idx), is.spinner_group, is.field_number };
 509                 }
 510         }
 511         for (const InstantiatedSpinner &is : light_spinners) {
 512                 if (is.spinner->hasFocus()) {
 513                         return FocusInfo{ int(is.bus_idx), is.spinner_group, is.field_number };
 514                 }
 515         }
 516         return FocusInfo{ -1, SpinnerGroup::ALL_GROUPS, -1 };
 517 }