feat(Controller): add support for settings

CMakeLists.txt

@@ -731,10 +731,14 @@ add_library(mixxx-lib STATIC EXCLUDE_FROM_ALL
   src/controllers/controllerlearningeventfilter.cpp
   src/controllers/controllermanager.cpp
   src/controllers/controllermappinginfo.cpp
+  src/controllers/legacycontrollersettings.cpp
+  src/controllers/legacycontrollersettingslayout.cpp
   src/controllers/controllermappinginfoenumerator.cpp
   src/controllers/controllermappingtablemodel.cpp
   src/controllers/controlleroutputmappingtablemodel.cpp
   src/controllers/controlpickermenu.cpp
+  src/controllers/legacycontrollermappingfilehandler.cpp
+  src/controllers/legacycontrollermapping.cpp
   src/controllers/delegates/controldelegate.cpp
   src/controllers/delegates/midibytedelegate.cpp
   src/controllers/delegates/midichanneldelegate.cpp
@@ -2070,6 +2074,7 @@ add_executable(mixxx-test
   src/test/colorpalette_test.cpp
   src/test/configobject_test.cpp
   src/test/controller_mapping_validation_test.cpp
+  src/test/controller_mapping_settings_test.cpp
   src/test/controllerscriptenginelegacy_test.cpp
   src/test/controlobjecttest.cpp
   src/test/controlobjectaliastest.cpp

res/controllers/engine-api.d.ts

@@ -24,6 +24,16 @@ declare interface ScriptConnection {
 /** ControllerScriptInterfaceLegacy */
 
 declare namespace engine {
+    type SettingValue = string | number | boolean;
+    /**
+     * Gets the value of a controller setting
+     * The value is either set in the preferences dialog,
+     * or got restored from file.
+     * @param name Name of the setting (as specified in the XML file of the mapping)
+     * @returns Value of the setting, or undefined in failure case
+     */
+    function getSetting(name: string): SettingValue | undefined;
+
     /**
      * Gets the control value
      *

src/controllers/controller.cpp

@@ -76,6 +76,8 @@ bool Controller::applyMapping() {
     }
 
     m_pScriptEngineLegacy->setScriptFiles(scriptFiles);
+
+    m_pScriptEngineLegacy->setSettings(pMapping->getSettings());
     return m_pScriptEngineLegacy->initialize();
 }
 

src/controllers/controllermanager.cpp

@@ -282,6 +282,7 @@ void ControllerManager::slotSetUpDevices() {
         if (!pMapping) {
             continue;
         }
+        pMapping->loadSettings(m_pConfig, pController->getName());
 
         // This runs on the main thread but LegacyControllerMapping is not thread safe, so clone it.
         pController->setMapping(pMapping->clone());

src/controllers/dlgprefcontroller.cpp

@@ -21,6 +21,7 @@
 #include "moc_dlgprefcontroller.cpp"
 #include "preferences/usersettings.h"
 #include "util/desktophelper.h"
+#include "util/parented_ptr.h"
 #include "util/string.h"
 
 namespace {
@@ -410,6 +411,7 @@ QString DlgPrefController::mappingFileLinks(
 
 void DlgPrefController::enumerateMappings(const QString& selectedMappingPath) {
     m_ui.comboBoxMapping->blockSignals(true);
+    QString currentMappingFilePath = mappingFilePathFromIndex(m_ui.comboBoxMapping->currentIndex());
     m_ui.comboBoxMapping->clear();
 
     // qDebug() << "Enumerating mappings for controller" << m_pController->getName();
@@ -461,14 +463,18 @@ void DlgPrefController::enumerateMappings(const QString& selectedMappingPath) {
     } else if (match.isValid()) {
         index = m_ui.comboBoxMapping->findText(match.getName());
     }
+    QString newMappingFilePath = mappingFilePathFromIndex(index);
     if (index == -1) {
         m_ui.chkEnabledDevice->setEnabled(false);
+        m_ui.groupBoxSettings->setVisible(false);
     } else {
         m_ui.comboBoxMapping->setCurrentIndex(index);
         m_ui.chkEnabledDevice->setEnabled(true);
     }
     m_ui.comboBoxMapping->blockSignals(false);
-    slotMappingSelected(m_ui.comboBoxMapping->currentIndex());
+    if (newMappingFilePath != currentMappingFilePath) {
+        slotMappingSelected(index);
+    }
 }
 
 MappingInfo DlgPrefController::enumerateMappingsFromEnumerator(
@@ -498,6 +504,8 @@ MappingInfo DlgPrefController::enumerateMappingsFromEnumerator(
 void DlgPrefController::slotUpdate() {
     enumerateMappings(m_pControllerManager->getConfiguredMappingFileForDevice(
             m_pController->getName()));
+    // Force updating the controller settings
+    slotMappingSelected(m_ui.comboBoxMapping->currentIndex());
 
     // enumeratePresets calls slotPresetSelected which will check the m_ui.chkEnabledDevice
     // checkbox if there is a valid mapping saved in the mixxx.cfg file. However, the
@@ -514,9 +522,10 @@ void DlgPrefController::slotUpdate() {
 }
 
 void DlgPrefController::slotResetToDefaults() {
-    m_ui.chkEnabledDevice->setChecked(false);
+    if (m_pMapping) {
+        m_pMapping->resetSettings();
+    }
     enumerateMappings(QString());
-    slotMappingSelected(m_ui.comboBoxMapping->currentIndex());
 }
 
 void DlgPrefController::applyMappingChanges() {
@@ -557,9 +566,13 @@ void DlgPrefController::slotApply() {
         return;
     }
 
-    QString mappingPath = mappingPathFromIndex(m_ui.comboBoxMapping->currentIndex());
-    m_pMapping = LegacyControllerMappingFileHandler::loadMapping(
-            QFileInfo(mappingPath), QDir(resourceMappingsPath(m_pConfig)));
+    // If there is currently a mapping loaded, we save the new settings for it.
+    // Note that `m_pMapping`, `mappingFileInfo` and the setting on the screen
+    // will always match as the settings displayed are updated depending of the
+    // currently selected mapping in `slotMappingSelected`
+    if (m_pMapping) {
+        m_pMapping->saveSettings(m_pConfig, m_pController->getName());
+    }
 
     // Load the resulting mapping (which has been mutated by the input/output
     // table models). The controller clones the mapping so we aren't touching
@@ -593,7 +606,7 @@ void DlgPrefController::enableWizardAndIOTabs(bool enable) {
     m_ui.outputMappingsTab->setEnabled(enable);
 }
 
-QString DlgPrefController::mappingPathFromIndex(int index) const {
+QString DlgPrefController::mappingFilePathFromIndex(int index) const {
     if (index == 0) {
         // "No Mapping" item
         return QString();
@@ -603,8 +616,8 @@ QString DlgPrefController::mappingPathFromIndex(int index) const {
 }
 
 void DlgPrefController::slotMappingSelected(int chosenIndex) {
-    QString mappingPath = mappingPathFromIndex(chosenIndex);
-    if (mappingPath.isEmpty()) { // User picked "No Mapping" item
+    QString mappingFilePath = mappingFilePathFromIndex(chosenIndex);
+    if (mappingFilePath.isEmpty()) { // User picked "No Mapping" item
         m_ui.chkEnabledDevice->setEnabled(false);
 
         if (m_ui.chkEnabledDevice->isChecked()) {
@@ -614,6 +627,8 @@ void DlgPrefController::slotMappingSelected(int chosenIndex) {
             }
             enableWizardAndIOTabs(false);
         }
+
+        m_ui.groupBoxSettings->setVisible(false);
     } else { // User picked a mapping
         m_ui.chkEnabledDevice->setEnabled(true);
 
@@ -628,7 +643,7 @@ void DlgPrefController::slotMappingSelected(int chosenIndex) {
     // Check if the mapping is different from the configured mapping
     if (m_GuiInitialized &&
             m_pControllerManager->getConfiguredMappingFileForDevice(
-                    m_pController->getName()) != mappingPath) {
+                    m_pController->getName()) != mappingFilePath) {
         setDirty(true);
     }
 
@@ -643,9 +658,10 @@ void DlgPrefController::slotMappingSelected(int chosenIndex) {
         }
     }
 
+    auto mappingFileInfo = QFileInfo(mappingFilePath);
     std::shared_ptr<LegacyControllerMapping> pMapping =
             LegacyControllerMappingFileHandler::loadMapping(
-                    QFileInfo(mappingPath), QDir(resourceMappingsPath(m_pConfig)));
+                    mappingFileInfo, QDir(resourceMappingsPath(m_pConfig)));
 
     if (pMapping) {
         DEBUG_ASSERT(!pMapping->isDirty());
@@ -654,7 +670,7 @@ void DlgPrefController::slotMappingSelected(int chosenIndex) {
     if (previousMappingSaved) {
         // We might have saved the previous preset with a new name, so update
         // the preset combobox.
-        enumerateMappings(mappingPath);
+        enumerateMappings(mappingFilePath);
     } else {
         slotShowMapping(pMapping);
     }
@@ -823,10 +839,41 @@ void DlgPrefController::slotShowMapping(std::shared_ptr<LegacyControllerMapping>
     m_ui.labelLoadedMappingSupportLinks->setText(mappingSupportLinks(pMapping));
     m_ui.labelLoadedMappingScriptFileLinks->setText(mappingFileLinks(pMapping));
 
-    // We mutate this mapping so keep a reference to it while we are using it.
-    // TODO(rryan): Clone it? Technically a waste since nothing else uses this
-    // copy but if someone did they might not expect it to change.
-    m_pMapping = pMapping;
+    if (pMapping) {
+        pMapping->loadSettings(m_pConfig, m_pController->getName());
+        auto settings = pMapping->getSettings();
+        auto* pLayout = pMapping->getSettingsLayout();
+
+        QLayoutItem* pItem;
+        while ((pItem = m_ui.groupBoxSettings->layout()->takeAt(0)) != nullptr) {
+            delete pItem->widget();
+            delete pItem;
+        }
+
+        if (pLayout != nullptr && !settings.isEmpty()) {
+            m_ui.groupBoxSettings->layout()->addWidget(pLayout->build(m_ui.groupBoxSettings));
+
+            for (const auto& setting : qAsConst(settings)) {
+                connect(setting.get(),
+                        &AbstractLegacyControllerSetting::changed,
+                        this,
+                        [this] { setDirty(true); });
+            }
+        }
+
+        m_ui.groupBoxSettings->setVisible(!settings.isEmpty());
+    }
+
+    // If there is still settings that may be saved and no new mapping selected
+    // (e.g restored default), we keep the the dirty mapping live so it can be
+    // saved in apply slot. If there is a new mapping, then setting changes are
+    // discarded
+    if (pMapping || (m_pMapping && !m_pMapping->hasDirtySettings())) {
+        // We mutate this mapping so keep a reference to it while we are using it.
+        // TODO(rryan): Clone it? Technically a waste since nothing else uses this
+        // copy but if someone did they might not expect it to change.
+        m_pMapping = pMapping;
+    }
 
     // Inputs tab
     ControllerInputMappingTableModel* pInputModel =

src/controllers/dlgprefcontroller.h

@@ -81,7 +81,7 @@ class DlgPrefController : public DlgPreferencePage {
     QString mappingDescription(const std::shared_ptr<LegacyControllerMapping> pMapping) const;
     QString mappingSupportLinks(const std::shared_ptr<LegacyControllerMapping> pMapping) const;
     QString mappingFileLinks(const std::shared_ptr<LegacyControllerMapping> pMapping) const;
-    QString mappingPathFromIndex(int index) const;
+    QString mappingFilePathFromIndex(int index) const;
     QString askForMappingName(const QString& prefilledName = QString()) const;
     void applyMappingChanges();
     bool saveMapping();