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

   1 #include "midi_mapping_dialog.h"
   2
   3 #include <assert.h>
   4 #include <google/protobuf/descriptor.h>
   5 #include <google/protobuf/message.h>
   6 #include <QComboBox>
   7 #include <QDialogButtonBox>
   8 #include <QFileDialog>
   9 #include <QMessageBox>
  10 #include <QPushButton>
  11 #include <QSpinBox>
  12 #include <QStringList>
  13 #include <QTreeWidget>
  14 #include <stdio.h>
  15 #include <algorithm>
  16 #include <cstddef>
  17 #include <functional>
  18 #include <limits>
  19 #include <string>
  20
  21 #include "controller_spin_box.h"
  22 #include "midi_mapper.h"
  23 #include "nageru_midi_mapping.pb.h"
  24 #include "shared/post_to_main_thread.h"
  25 #include "ui_midi_mapping.h"
  26
  27 class QObject;
  28
  29 using namespace google::protobuf;
  30 using namespace std;
  31
  32 vector<MIDIMappingDialog::Control> per_bus_controllers = {
  33         { "Stereo width",             MIDIMappingBusProto::kStereoWidthFieldNumber,
  34                                       MIDIMappingProto::kStereoWidthBankFieldNumber },
  35         { "Treble",                   MIDIMappingBusProto::kTrebleFieldNumber, MIDIMappingProto::kTrebleBankFieldNumber },
  36         { "Mid",                      MIDIMappingBusProto::kMidFieldNumber,    MIDIMappingProto::kMidBankFieldNumber },
  37         { "Bass",                     MIDIMappingBusProto::kBassFieldNumber,   MIDIMappingProto::kBassBankFieldNumber },
  38         { "Gain",                     MIDIMappingBusProto::kGainFieldNumber,   MIDIMappingProto::kGainBankFieldNumber },
  39         { "Compressor threshold",     MIDIMappingBusProto::kCompressorThresholdFieldNumber,
  40                                       MIDIMappingProto::kCompressorThresholdBankFieldNumber},
  41         { "Fader",                    MIDIMappingBusProto::kFaderFieldNumber,  MIDIMappingProto::kFaderBankFieldNumber }
  42 };
  43 vector<MIDIMappingDialog::Control> per_bus_buttons = {
  44         { "Toggle mute",              MIDIMappingBusProto::kToggleMuteFieldNumber,
  45                                       MIDIMappingProto::kToggleMuteBankFieldNumber },
  46         { "Toggle locut",             MIDIMappingBusProto::kToggleLocutFieldNumber,
  47                                       MIDIMappingProto::kToggleLocutBankFieldNumber },
  48         { "Togle auto gain staging",  MIDIMappingBusProto::kToggleAutoGainStagingFieldNumber,
  49                                       MIDIMappingProto::kToggleAutoGainStagingBankFieldNumber },
  50         { "Togle compressor",         MIDIMappingBusProto::kToggleCompressorFieldNumber,
  51                                       MIDIMappingProto::kToggleCompressorBankFieldNumber },
  52         { "Clear peak",               MIDIMappingBusProto::kClearPeakFieldNumber,
  53                                       MIDIMappingProto::kClearPeakBankFieldNumber }
  54 };
  55 vector<MIDIMappingDialog::Control> per_bus_lights = {
  56         { "Is muted",                 MIDIMappingBusProto::kIsMutedFieldNumber, 0 },
  57         { "Locut is on",              MIDIMappingBusProto::kLocutIsOnFieldNumber, 0 },
  58         { "Auto gain staging is on",  MIDIMappingBusProto::kAutoGainStagingIsOnFieldNumber, 0 },
  59         { "Compressor is on",         MIDIMappingBusProto::kCompressorIsOnFieldNumber, 0 },
  60         { "Bus has peaked",           MIDIMappingBusProto::kHasPeakedFieldNumber, 0 }
  61 };
  62 vector<MIDIMappingDialog::Control> global_controllers = {
  63         { "Locut cutoff",             MIDIMappingBusProto::kLocutFieldNumber,  MIDIMappingProto::kLocutBankFieldNumber },
  64         { "Limiter threshold",        MIDIMappingBusProto::kLimiterThresholdFieldNumber,
  65                                       MIDIMappingProto::kLimiterThresholdBankFieldNumber },
  66         { "Makeup gain",              MIDIMappingBusProto::kMakeupGainFieldNumber,
  67                                       MIDIMappingProto::kMakeupGainBankFieldNumber }
  68 };
  69 vector<MIDIMappingDialog::Control> global_buttons = {
  70         { "Previous bank",            MIDIMappingBusProto::kPrevBankFieldNumber, 0 },
  71         { "Next bank",                MIDIMappingBusProto::kNextBankFieldNumber, 0 },
  72         { "Select bank 1",            MIDIMappingBusProto::kSelectBank1FieldNumber, 0 },
  73         { "Select bank 2",            MIDIMappingBusProto::kSelectBank2FieldNumber, 0 },
  74         { "Select bank 3",            MIDIMappingBusProto::kSelectBank3FieldNumber, 0 },
  75         { "Select bank 4",            MIDIMappingBusProto::kSelectBank4FieldNumber, 0 },
  76         { "Select bank 5",            MIDIMappingBusProto::kSelectBank5FieldNumber, 0 },
  77         { "Toggle limiter",           MIDIMappingBusProto::kToggleLimiterFieldNumber, MIDIMappingProto::kToggleLimiterBankFieldNumber },
  78         { "Toggle auto makeup gain",  MIDIMappingBusProto::kToggleAutoMakeupGainFieldNumber, MIDIMappingProto::kToggleAutoMakeupGainBankFieldNumber }
  79 };
  80 vector<MIDIMappingDialog::Control> global_lights = {
  81         { "Bank 1 is selected",       MIDIMappingBusProto::kBank1IsSelectedFieldNumber, 0 },
  82         { "Bank 2 is selected",       MIDIMappingBusProto::kBank2IsSelectedFieldNumber, 0 },
  83         { "Bank 3 is selected",       MIDIMappingBusProto::kBank3IsSelectedFieldNumber, 0 },
  84         { "Bank 4 is selected",       MIDIMappingBusProto::kBank4IsSelectedFieldNumber, 0 },
  85         { "Bank 5 is selected",       MIDIMappingBusProto::kBank5IsSelectedFieldNumber, 0 },
  86         { "Limiter is on",            MIDIMappingBusProto::kLimiterIsOnFieldNumber, 0 },
  87         { "Auto makeup gain is on",   MIDIMappingBusProto::kAutoMakeupGainIsOnFieldNumber, 0 },
  88 };
  89
  90 namespace {
  91
  92 int get_bank(const MIDIMappingProto &mapping_proto, int bank_field_number, int default_value)
  93 {
  94         const FieldDescriptor *bank_descriptor = mapping_proto.GetDescriptor()->FindFieldByNumber(bank_field_number);
  95         const Reflection *reflection = mapping_proto.GetReflection();
  96         if (!reflection->HasField(mapping_proto, bank_descriptor)) {
  97                 return default_value;
  98         }
  99         return reflection->GetInt32(mapping_proto, bank_descriptor);
 100 }
 101
 102 int get_controller_mapping(const MIDIMappingProto &mapping_proto, size_t bus_idx, int field_number, int default_value)
 103 {
 104         if (bus_idx >= size_t(mapping_proto.bus_mapping_size())) {
 105                 return default_value;
 106         }
 107
 108         const MIDIMappingBusProto &bus_mapping = mapping_proto.bus_mapping(bus_idx);
 109         const FieldDescriptor *descriptor = bus_mapping.GetDescriptor()->FindFieldByNumber(field_number);
 110         const Reflection *bus_reflection = bus_mapping.GetReflection();
 111         if (!bus_reflection->HasField(bus_mapping, descriptor)) {
 112                 return default_value;
 113         }
 114         const MIDIControllerProto &controller_proto =
 115                 static_cast<const MIDIControllerProto &>(bus_reflection->GetMessage(bus_mapping, descriptor));
 116         return controller_proto.controller_number();
 117 }
 118
 119 int get_button_mapping(const MIDIMappingProto &mapping_proto, size_t bus_idx, int field_number, int default_value)
 120 {
 121         if (bus_idx >= size_t(mapping_proto.bus_mapping_size())) {
 122                 return default_value;
 123         }
 124
 125         const MIDIMappingBusProto &bus_mapping = mapping_proto.bus_mapping(bus_idx);
 126         const FieldDescriptor *descriptor = bus_mapping.GetDescriptor()->FindFieldByNumber(field_number);
 127         const Reflection *bus_reflection = bus_mapping.GetReflection();
 128         if (!bus_reflection->HasField(bus_mapping, descriptor)) {
 129                 return default_value;
 130         }
 131         const MIDIButtonProto &bus_proto =
 132                 static_cast<const MIDIButtonProto &>(bus_reflection->GetMessage(bus_mapping, descriptor));
 133         return bus_proto.note_number();
 134 }
 135
 136 int get_light_mapping(const MIDIMappingProto &mapping_proto, size_t bus_idx, int field_number, int default_value)
 137 {
 138         if (bus_idx >= size_t(mapping_proto.bus_mapping_size())) {
 139                 return default_value;
 140         }
 141
 142         const MIDIMappingBusProto &bus_mapping = mapping_proto.bus_mapping(bus_idx);
 143         const FieldDescriptor *descriptor = bus_mapping.GetDescriptor()->FindFieldByNumber(field_number);
 144         const Reflection *bus_reflection = bus_mapping.GetReflection();
 145         if (!bus_reflection->HasField(bus_mapping, descriptor)) {
 146                 return default_value;
 147         }
 148         const MIDILightProto &bus_proto =
 149                 static_cast<const MIDILightProto &>(bus_reflection->GetMessage(bus_mapping, descriptor));
 150         return bus_proto.note_number();
 151 }
 152
 153 }  // namespace
 154
 155 MIDIMappingDialog::MIDIMappingDialog(MIDIMapper *mapper)
 156         : ui(new Ui::MIDIMappingDialog),
 157           mapper(mapper)
 158 {
 159         ui->setupUi(this);
 160
 161         const MIDIMappingProto mapping_proto = mapper->get_current_mapping();  // Take a copy.
 162         old_receiver = mapper->set_receiver(this);
 163
 164         QStringList labels;
 165         labels << "";
 166         labels << "Controller bank";
 167         for (unsigned bus_idx = 0; bus_idx < num_buses; ++bus_idx) {
 168                 char buf[256];
 169                 snprintf(buf, sizeof(buf), "Bus %d", bus_idx + 1);
 170                 labels << buf;
 171         }
 172         labels << "";
 173         ui->treeWidget->setColumnCount(num_buses + 3);
 174         ui->treeWidget->setHeaderLabels(labels);
 175
 176         add_controls("Per-bus controllers", ControlType::CONTROLLER, SpinnerGroup::PER_BUS_CONTROLLERS, mapping_proto, per_bus_controllers);
 177         add_controls("Per-bus buttons", ControlType::BUTTON, SpinnerGroup::PER_BUS_BUTTONS, mapping_proto, per_bus_buttons);
 178         add_controls("Per-bus lights", ControlType::LIGHT, SpinnerGroup::PER_BUS_LIGHTS, mapping_proto, per_bus_lights);
 179         add_controls("Global controllers", ControlType::CONTROLLER, SpinnerGroup::GLOBAL_CONTROLLERS, mapping_proto, global_controllers);
 180         add_controls("Global buttons", ControlType::BUTTON, SpinnerGroup::GLOBAL_BUTTONS, mapping_proto, global_buttons);
 181         add_controls("Global lights", ControlType::LIGHT, SpinnerGroup::GLOBAL_LIGHTS, mapping_proto, global_lights);
 182         fill_controls_from_mapping(mapping_proto);
 183
 184         // Auto-resize every column but the last.
 185         for (unsigned column_idx = 0; column_idx < num_buses + 3; ++column_idx) {
 186                 ui->treeWidget->resizeColumnToContents(column_idx);
 187         }
 188
 189         connect(ui->guess_bus_button, &QPushButton::clicked,
 190                 bind(&MIDIMappingDialog::guess_clicked, this, false));
 191         connect(ui->guess_group_button, &QPushButton::clicked,
 192                 bind(&MIDIMappingDialog::guess_clicked, this, true));
 193         connect(ui->ok_cancel_buttons, &QDialogButtonBox::accepted, this, &MIDIMappingDialog::ok_clicked);
 194         connect(ui->ok_cancel_buttons, &QDialogButtonBox::rejected, this, &MIDIMappingDialog::cancel_clicked);
 195         connect(ui->save_button, &QPushButton::clicked, this, &MIDIMappingDialog::save_clicked);
 196         connect(ui->load_button, &QPushButton::clicked, this, &MIDIMappingDialog::load_clicked);
 197
 198         update_guess_button_state();
 199 }
 200
 201 MIDIMappingDialog::~MIDIMappingDialog()
 202 {
 203         mapper->set_receiver(old_receiver);
 204         mapper->refresh_highlights();
 205 }
 206
 207 bool MIDIMappingDialog::eventFilter(QObject *obj, QEvent *event)
 208 {
 209         if (event->type() == QEvent::FocusIn ||
 210             event->type() == QEvent::FocusOut) {
 211                 // We ignore the guess buttons themselves; it should be allowed
 212                 // to navigate from a spinner to focus on a button (to click it).
 213                 if (obj != ui->guess_bus_button && obj != ui->guess_group_button) {
 214                         update_guess_button_state();
 215                 }
 216         }
 217         return false;
 218 }
 219
 220 void MIDIMappingDialog::guess_clicked(bool limit_to_group)
 221 {
 222         FocusInfo focus = find_focus();
 223         if (focus.bus_idx == -1) {
 224                 // The guess button probably took the focus away from us.
 225                 focus = last_focus;
 226         }
 227         assert(focus.bus_idx != -1);  // The button should have been disabled.
 228         pair<int, int> bus_and_offset = guess_offset(focus.bus_idx, limit_to_group ? focus.spinner_group : SpinnerGroup::ALL_GROUPS);
 229         const int source_bus_idx = bus_and_offset.first;
 230         const int offset = bus_and_offset.second;
 231         assert(source_bus_idx != -1);  // The button should have been disabled.
 232
 233         for (const auto &field_number_and_spinner : spinners[focus.bus_idx]) {
 234                 int field_number = field_number_and_spinner.first;
 235                 QSpinBox *spinner = field_number_and_spinner.second.spinner;
 236                 SpinnerGroup this_spinner_group = field_number_and_spinner.second.group;
 237
 238                 if (limit_to_group && this_spinner_group != focus.spinner_group) {
 239                         continue;
 240                 }
 241
 242                 assert(spinners[source_bus_idx].count(field_number));
 243                 QSpinBox *source_spinner = spinners[source_bus_idx][field_number].spinner;
 244                 assert(spinners[source_bus_idx][field_number].group == this_spinner_group);
 245
 246                 if (source_spinner->value() != -1) {
 247                         spinner->setValue(source_spinner->value() + offset);
 248                 }
 249         }
 250
 251         // See if we can find a “next” bus to move the focus to.
 252         const int next_bus_idx = focus.bus_idx + (focus.bus_idx - source_bus_idx);  // Note: Could become e.g. -1.
 253         for (const InstantiatedSpinner &is : controller_spinners) {
 254                 if (int(is.bus_idx) == next_bus_idx && is.field_number == focus.field_number) {
 255                         is.spinner->setFocus();
 256                 }
 257         }
 258         for (const InstantiatedSpinner &is : button_spinners) {
 259                 if (int(is.bus_idx) == next_bus_idx && is.field_number == focus.field_number) {
 260                         is.spinner->setFocus();
 261                 }
 262         }
 263         for (const InstantiatedSpinner &is : light_spinners) {
 264                 if (int(is.bus_idx) == next_bus_idx && is.field_number == focus.field_number) {
 265                         is.spinner->setFocus();
 266                 }
 267         }
 268 }
 269
 270 void MIDIMappingDialog::ok_clicked()
 271 {
 272         unique_ptr<MIDIMappingProto> new_mapping = construct_mapping_proto_from_ui();
 273         mapper->set_midi_mapping(*new_mapping);
 274         mapper->set_receiver(old_receiver);
 275         accept();
 276 }
 277
 278 void MIDIMappingDialog::cancel_clicked()
 279 {
 280         mapper->set_receiver(old_receiver);
 281         reject();
 282 }
 283
 284 void MIDIMappingDialog::save_clicked()
 285 {
 286 #if HAVE_CEF
 287         // The native file dialog uses GTK+, which interferes with CEF's use of the GLib main loop.
 288         QFileDialog::Options options(QFileDialog::DontUseNativeDialog);
 289 #else
 290         QFileDialog::Options options;
 291 #endif
 292         unique_ptr<MIDIMappingProto> new_mapping = construct_mapping_proto_from_ui();
 293         QString filename = QFileDialog::getSaveFileName(this,
 294                 "Save MIDI mapping", QString(), tr("Mapping files (*.midimapping)"), /*selectedFilter=*/nullptr, options);
 295         if (!filename.endsWith(".midimapping")) {
 296                 filename += ".midimapping";
 297         }
 298         if (!save_midi_mapping_to_file(*new_mapping, filename.toStdString())) {
 299                 QMessageBox box;
 300                 box.setText("Could not save mapping to '" + filename + "'. Check that you have the right permissions and try again.");
 301                 box.exec();
 302         }
 303 }
 304
 305 void MIDIMappingDialog::load_clicked()
 306 {
 307 #if HAVE_CEF
 308         // The native file dialog uses GTK+, which interferes with CEF's use of the GLib main loop.
 309         QFileDialog::Options options(QFileDialog::DontUseNativeDialog);
 310 #else
 311         QFileDialog::Options options;
 312 #endif
 313         QString filename = QFileDialog::getOpenFileName(this,
 314                 "Load MIDI mapping", QString(), tr("Mapping files (*.midimapping)"), /*selectedFilter=*/nullptr, options);
 315         MIDIMappingProto new_mapping;
 316         if (!load_midi_mapping_from_file(filename.toStdString(), &new_mapping)) {
 317                 QMessageBox box;
 318                 box.setText("Could not load mapping from '" + filename + "'. Check that the file exists, has the right permissions and is valid.");
 319                 box.exec();
 320                 return;
 321         }
 322
 323         fill_controls_from_mapping(new_mapping);
 324 }
 325
 326 namespace {
 327
 328 template<class T>
 329 T *get_mutable_bus_message(MIDIMappingProto *mapping_proto, unsigned bus_idx, int field_number)
 330 {
 331         while (size_t(mapping_proto->bus_mapping_size()) <= bus_idx) {
 332                 mapping_proto->add_bus_mapping();
 333         }
 334
 335         MIDIMappingBusProto *bus_mapping = mapping_proto->mutable_bus_mapping(bus_idx);
 336         const FieldDescriptor *descriptor = bus_mapping->GetDescriptor()->FindFieldByNumber(field_number);
 337         const Reflection *bus_reflection = bus_mapping->GetReflection();
 338         return static_cast<T *>(bus_reflection->MutableMessage(bus_mapping, descriptor));
 339 }
 340
 341 }  // namespace
 342
 343 unique_ptr<MIDIMappingProto> MIDIMappingDialog::construct_mapping_proto_from_ui()
 344 {
 345         unique_ptr<MIDIMappingProto> mapping_proto(new MIDIMappingProto);
 346         for (const InstantiatedSpinner &is : controller_spinners) {
 347                 const int val = is.spinner->value();
 348                 if (val == -1) {
 349                         continue;
 350                 }
 351
 352                 MIDIControllerProto *controller_proto =
 353                         get_mutable_bus_message<MIDIControllerProto>(mapping_proto.get(), is.bus_idx, is.field_number);
 354                 controller_proto->set_controller_number(val);
 355         }
 356         for (const InstantiatedSpinner &is : button_spinners) {
 357                 const int val = is.spinner->value();
 358                 if (val == -1) {
 359                         continue;
 360                 }
 361
 362                 MIDIButtonProto *button_proto =
 363                         get_mutable_bus_message<MIDIButtonProto>(mapping_proto.get(), is.bus_idx, is.field_number);
 364                 button_proto->set_note_number(val);
 365         }
 366         for (const InstantiatedSpinner &is : light_spinners) {
 367                 const int val = is.spinner->value();
 368                 if (val == -1) {
 369                         continue;
 370                 }
 371
 372                 MIDILightProto *light_proto =
 373                         get_mutable_bus_message<MIDILightProto>(mapping_proto.get(), is.bus_idx, is.field_number);
 374                 light_proto->set_note_number(val);
 375         }
 376         int highest_bank_used = 0;  // 1-indexed.
 377         for (const InstantiatedComboBox &ic : bank_combo_boxes) {
 378                 const int val = ic.combo_box->currentIndex();
 379                 highest_bank_used = std::max(highest_bank_used, val);
 380                 if (val == 0) {
 381                         continue;
 382                 }
 383
 384                 const FieldDescriptor *descriptor = mapping_proto->GetDescriptor()->FindFieldByNumber(ic.field_number);
 385                 const Reflection *bus_reflection = mapping_proto->GetReflection();
 386                 bus_reflection->SetInt32(mapping_proto.get(), descriptor, val - 1);
 387         }
 388         mapping_proto->set_num_controller_banks(highest_bank_used);
 389         return mapping_proto;
 390 }
 391
 392 void MIDIMappingDialog::add_bank_selector(QTreeWidgetItem *item, const MIDIMappingProto &mapping_proto, int bank_field_number)
 393 {
 394         if (bank_field_number == 0) {
 395                 return;
 396         }
 397         QComboBox *bank_selector = new QComboBox(this);
 398         bank_selector->addItems(QStringList() << "" << "Bank 1" << "Bank 2" << "Bank 3" << "Bank 4" << "Bank 5");
 399         bank_selector->setAutoFillBackground(true);
 400
 401         bank_combo_boxes.push_back(InstantiatedComboBox{ bank_selector, bank_field_number });
 402
 403         ui->treeWidget->setItemWidget(item, 1, bank_selector);
 404 }
 405
 406 void MIDIMappingDialog::add_controls(const string &heading,
 407                                      MIDIMappingDialog::ControlType control_type,
 408                                      MIDIMappingDialog::SpinnerGroup spinner_group,
 409                                      const MIDIMappingProto &mapping_proto,
 410                                      const vector<MIDIMappingDialog::Control> &controls)
 411 {
 412         QTreeWidgetItem *heading_item = new QTreeWidgetItem(ui->treeWidget);
 413         heading_item->setText(0, QString::fromStdString(heading));
 414         heading_item->setFirstColumnSpanned(true);
 415         heading_item->setExpanded(true);
 416         for (const Control &control : controls) {
 417                 QTreeWidgetItem *item = new QTreeWidgetItem(heading_item);
 418                 heading_item->addChild(item);
 419                 add_bank_selector(item, mapping_proto, control.bank_field_number);
 420                 item->setText(0, QString::fromStdString(control.label + "   "));
 421
 422                 for (unsigned bus_idx = 0; bus_idx < num_buses; ++bus_idx) {
 423                         QSpinBox *spinner;
 424                         if (control_type == ControlType::CONTROLLER) {
 425                                 spinner = new ControllerSpinBox(this);
 426                                 spinner->setRange(-1, 128);  // 128 for pitch bend.
 427                         } else {
 428                                 spinner = new QSpinBox(this);
 429                                 spinner->setRange(-1, 127);
 430                         }
 431                         spinner->setAutoFillBackground(true);
 432                         spinner->setSpecialValueText("\u200d");  // Zero-width joiner (ie., empty).
 433                         spinner->installEventFilter(this);  // So we know when the focus changes.
 434                         ui->treeWidget->setItemWidget(item, bus_idx + 2, spinner);
 435
 436                         if (control_type == ControlType::CONTROLLER) {
 437                                 controller_spinners.push_back(InstantiatedSpinner{ spinner, bus_idx, spinner_group, control.field_number });
 438                         } else if (control_type == ControlType::BUTTON) {
 439                                 button_spinners.push_back(InstantiatedSpinner{ spinner, bus_idx, spinner_group, control.field_number });
 440                         } else {
 441                                 assert(control_type == ControlType::LIGHT);
 442                                 light_spinners.push_back(InstantiatedSpinner{ spinner, bus_idx, spinner_group, control.field_number });
 443                         }
 444                         spinners[bus_idx][control.field_number] = SpinnerAndGroup{ spinner, spinner_group };
 445                         connect(spinner, static_cast<void(QSpinBox::*)(int)>(&QSpinBox::valueChanged),
 446                                 bind(&MIDIMappingDialog::update_guess_button_state, this));
 447                 }
 448         }
 449         ui->treeWidget->addTopLevelItem(heading_item);
 450 }
 451
 452 void MIDIMappingDialog::fill_controls_from_mapping(const MIDIMappingProto &mapping_proto)
 453 {
 454         for (const InstantiatedSpinner &is : controller_spinners) {
 455                 is.spinner->setValue(get_controller_mapping(mapping_proto, is.bus_idx, is.field_number, -1));
 456         }
 457         for (const InstantiatedSpinner &is : button_spinners) {
 458                 is.spinner->setValue(get_button_mapping(mapping_proto, is.bus_idx, is.field_number, -1));
 459         }
 460         for (const InstantiatedSpinner &is : light_spinners) {
 461                 is.spinner->setValue(get_light_mapping(mapping_proto, is.bus_idx, is.field_number, -1));
 462         }
 463         for (const InstantiatedComboBox &ic : bank_combo_boxes) {
 464                 ic.combo_box->setCurrentIndex(get_bank(mapping_proto, ic.field_number, -1) + 1);
 465         }
 466 }
 467
 468 void MIDIMappingDialog::controller_changed(unsigned controller)
 469 {
 470         post_to_main_thread([=]{
 471                 for (const InstantiatedSpinner &is : controller_spinners) {
 472                         if (is.spinner->hasFocus()) {
 473                                 is.spinner->setValue(controller);
 474                                 is.spinner->selectAll();
 475                         }
 476                 }
 477         });
 478 }
 479
 480 void MIDIMappingDialog::note_on(unsigned note)
 481 {
 482         post_to_main_thread([=]{
 483                 for (const InstantiatedSpinner &is : button_spinners) {
 484                         if (is.spinner->hasFocus()) {
 485                                 is.spinner->setValue(note);
 486                                 is.spinner->selectAll();
 487                         }
 488                 }
 489                 for (const InstantiatedSpinner &is : light_spinners) {
 490                         if (is.spinner->hasFocus()) {
 491                                 is.spinner->setValue(note);
 492                                 is.spinner->selectAll();
 493                         }
 494                 }
 495         });
 496 }
 497
 498 pair<int, int> MIDIMappingDialog::guess_offset(unsigned bus_idx, MIDIMappingDialog::SpinnerGroup spinner_group)
 499 {
 500         constexpr pair<int, int> not_found(-1, 0);
 501
 502         if (bus_is_empty(bus_idx, spinner_group)) {
 503                 return not_found;
 504         }
 505
 506         // See if we can find a non-empty bus to source from (prefer from the left).
 507         unsigned source_bus_idx;
 508         if (bus_idx > 0 && !bus_is_empty(bus_idx - 1, spinner_group)) {
 509                 source_bus_idx = bus_idx - 1;
 510         } else if (bus_idx < num_buses - 1 && !bus_is_empty(bus_idx + 1, spinner_group)) {
 511                 source_bus_idx = bus_idx + 1;
 512         } else {
 513                 return not_found;
 514         }
 515
 516         // See if we can find a consistent offset.
 517         bool found_offset = false;
 518         int offset = 0;
 519         int minimum_allowed_offset = numeric_limits<int>::min();
 520         int maximum_allowed_offset = numeric_limits<int>::max();
 521         for (const auto &field_number_and_spinner : spinners[bus_idx]) {
 522                 int field_number = field_number_and_spinner.first;
 523                 QSpinBox *spinner = field_number_and_spinner.second.spinner;
 524                 SpinnerGroup this_spinner_group = field_number_and_spinner.second.group;
 525                 assert(spinners[source_bus_idx].count(field_number));
 526                 QSpinBox *source_spinner = spinners[source_bus_idx][field_number].spinner;
 527                 assert(spinners[source_bus_idx][field_number].group == this_spinner_group);
 528
 529                 if (spinner_group != SpinnerGroup::ALL_GROUPS &&
 530                     spinner_group != this_spinner_group) {
 531                         continue;
 532                 }
 533                 if (spinner->value() == -1) {
 534                         if (source_spinner->value() != -1) {
 535                                 // If the source value is e.g. 3, offset can't be less than -2 or larger than 124.
 536                                 // Otherwise, we'd extrapolate values outside [1..127].
 537                                 minimum_allowed_offset = max(minimum_allowed_offset, 1 - source_spinner->value());
 538                                 maximum_allowed_offset = min(maximum_allowed_offset, 127 - source_spinner->value());
 539                         }
 540                         continue;
 541                 }
 542                 if (source_spinner->value() == -1) {
 543                         // The bus has a controller set that the source bus doesn't set.
 544                         return not_found;
 545                 }
 546                 if (source_spinner->value() == MIDIReceiver::PITCH_BEND_CONTROLLER) {
 547                         // It's impossible to interpolate across the pitch bend.
 548                         return not_found;
 549                 }
 550
 551                 int candidate_offset = spinner->value() - source_spinner->value();
 552                 if (!found_offset) {
 553                         offset = candidate_offset;
 554                         found_offset = true;
 555                 } else if (candidate_offset != offset) {
 556                         return not_found;
 557                 }
 558         }
 559
 560         if (!found_offset) {
 561                 // Given that the bus wasn't empty, this shouldn't happen.
 562                 assert(false);
 563                 return not_found;
 564         }
 565
 566         if (offset < minimum_allowed_offset || offset > maximum_allowed_offset) {
 567                 return not_found;
 568         }
 569         return make_pair(source_bus_idx, offset);
 570 }
 571
 572 bool MIDIMappingDialog::bus_is_empty(unsigned bus_idx, SpinnerGroup spinner_group)
 573 {
 574         for (const auto &field_number_and_spinner : spinners[bus_idx]) {
 575                 QSpinBox *spinner = field_number_and_spinner.second.spinner;
 576                 SpinnerGroup this_spinner_group = field_number_and_spinner.second.group;
 577                 if (spinner_group != SpinnerGroup::ALL_GROUPS &&
 578                     spinner_group != this_spinner_group) {
 579                         continue;
 580                 }
 581                 if (spinner->value() != -1) {
 582                         return false;
 583                 }
 584         }
 585         return true;
 586 }
 587
 588 void MIDIMappingDialog::update_guess_button_state()
 589 {
 590         FocusInfo focus = find_focus();
 591         if (focus.bus_idx < 0) {
 592                 return;
 593         }
 594         {
 595                 pair<int, int> bus_and_offset = guess_offset(focus.bus_idx, SpinnerGroup::ALL_GROUPS);
 596                 ui->guess_bus_button->setEnabled(bus_and_offset.first != -1);
 597         }
 598         {
 599                 pair<int, int> bus_and_offset = guess_offset(focus.bus_idx, focus.spinner_group);
 600                 ui->guess_group_button->setEnabled(bus_and_offset.first != -1);
 601         }
 602         last_focus = focus;
 603 }
 604
 605 MIDIMappingDialog::FocusInfo MIDIMappingDialog::find_focus() const
 606 {
 607         for (const InstantiatedSpinner &is : controller_spinners) {
 608                 if (is.spinner->hasFocus()) {
 609                         return FocusInfo{ int(is.bus_idx), is.spinner_group, is.field_number };
 610                 }
 611         }
 612         for (const InstantiatedSpinner &is : button_spinners) {
 613                 if (is.spinner->hasFocus()) {
 614                         return FocusInfo{ int(is.bus_idx), is.spinner_group, is.field_number };
 615                 }
 616         }
 617         for (const InstantiatedSpinner &is : light_spinners) {
 618                 if (is.spinner->hasFocus()) {
 619                         return FocusInfo{ int(is.bus_idx), is.spinner_group, is.field_number };
 620                 }
 621         }
 622         return FocusInfo{ -1, SpinnerGroup::ALL_GROUPS, -1 };
 623 }