Editor/ProjectModel: Use std::move where applicable

Amends the node interfaces to utilize std::move where applicable. This
allows avoiding some string copies altogether, as well as some IObj
atomic reference count increments and decrements.

Editor/MainWindow.cpp

@@ -1295,60 +1295,75 @@ void MainWindow::recursiveExpandAndSelectOutline(const QModelIndex& index) const
 void MainWindow::newSubprojectAction() {
   QString newName;
   bool ok = true;
-  while (ok && newName.isEmpty())
+
+  while (ok && newName.isEmpty()) {
     newName = QInputDialog::getText(this, tr("New Subproject"), tr("What should this subproject be named?"),
                                     QLineEdit::Normal, QString(), &ok);
-  if (!ok)
+  }
-    return;
 
-  ProjectModel::GroupNode* node = m_projectModel->newSubproject(newName);
+  if (!ok) {
+    return;
+  }
+
+  m_projectModel->newSubproject(std::move(newName));
 }
 
 void MainWindow::newSFXGroupAction() {
   ProjectModel::GroupNode* group = getSelectedGroupNode();
   m_projectModel->setIdDatabases(group);
-  QString groupName = getGroupName(group);
+  const QString groupName = getGroupName(group);
   QString newName;
   bool ok = true;
-  while (ok && newName.isEmpty())
+
+  while (ok && newName.isEmpty()) {
     newName = QInputDialog::getText(
         this, tr("New SFX Group"), tr("What should the new SFX group in %1 be named?").arg(groupName),
         QLineEdit::Normal,
         QString::fromStdString(amuse::GroupId::CurNameDB->generateDefaultName(amuse::NameDB::Type::Group)), &ok);
-  if (!ok)
+  }
-    return;
 
-  ProjectModel::SoundGroupNode* node = m_projectModel->newSoundGroup(group, newName);
+  if (!ok) {
-  if (node)
+    return;
+  }
+
+  ProjectModel::SoundGroupNode* node = m_projectModel->newSoundGroup(group, std::move(newName));
+  if (node) {
     openEditor(node);
   }
+}
 
 void MainWindow::newSongGroupAction() {
   ProjectModel::GroupNode* group = getSelectedGroupNode();
   m_projectModel->setIdDatabases(group);
-  QString groupName = getGroupName(group);
+  const QString groupName = getGroupName(group);
   QString newName;
   bool ok = true;
-  while (ok && newName.isEmpty())
+
+  while (ok && newName.isEmpty()) {
     newName = QInputDialog::getText(
         this, tr("New Song Group"), tr("What should the new Song group in %1 be named?").arg(groupName),
         QLineEdit::Normal,
         QString::fromStdString(amuse::GroupId::CurNameDB->generateDefaultName(amuse::NameDB::Type::Group)), &ok);
-  if (!ok)
+  }
-    return;
 
-  ProjectModel::SongGroupNode* node = m_projectModel->newSongGroup(group, newName);
+  if (!ok) {
-  if (node)
+    return;
+  }
+
+  ProjectModel::SongGroupNode* node = m_projectModel->newSongGroup(group, std::move(newName));
+  if (node) {
     openEditor(node);
   }
+}
 
 void MainWindow::newSoundMacroAction() {
   ProjectModel::GroupNode* group = getSelectedGroupNode();
   m_projectModel->setIdDatabases(group);
-  QString groupName = getGroupName(group);
+  const QString groupName = getGroupName(group);
   QString newName;
   const SoundMacroTemplateEntry* templ = nullptr;
   int result = QDialog::Accepted;
+
   while (result == QDialog::Accepted && newName.isEmpty()) {
     NewSoundMacroDialog dialog(groupName, this);
     dialog.setWindowModality(Qt::WindowModal);
@@ -1356,85 +1371,108 @@ void MainWindow::newSoundMacroAction() {
     newName = dialog.getName();
     templ = dialog.getSelectedTemplate();
   }
-  if (result == QDialog::Rejected)
-    return;
 
-  ProjectModel::SoundMacroNode* node = m_projectModel->newSoundMacro(group, newName, templ);
+  if (result == QDialog::Rejected) {
-  if (node)
+    return;
+  }
+
+  ProjectModel::SoundMacroNode* node = m_projectModel->newSoundMacro(group, std::move(newName), templ);
+  if (node) {
     openEditor(node);
   }
+}
 
 void MainWindow::newADSRAction() {
   ProjectModel::GroupNode* group = getSelectedGroupNode();
   m_projectModel->setIdDatabases(group);
-  QString groupName = getGroupName(group);
+  const QString groupName = getGroupName(group);
   QString newName;
   bool ok = true;
-  while (ok && newName.isEmpty())
+
+  while (ok && newName.isEmpty()) {
     newName = QInputDialog::getText(
         this, tr("New ADSR"), tr("What should the new ADSR in %1 be named?").arg(groupName), QLineEdit::Normal,
         QString::fromStdString(amuse::TableId::CurNameDB->generateDefaultName(amuse::NameDB::Type::Table)), &ok);
-  if (!ok)
+  }
-    return;
 
-  ProjectModel::ADSRNode* node = m_projectModel->newADSR(group, newName);
+  if (!ok) {
-  if (node)
+    return;
+  }
+
+  ProjectModel::ADSRNode* node = m_projectModel->newADSR(group, std::move(newName));
+  if (node) {
     openEditor(node);
   }
+}
 
 void MainWindow::newCurveAction() {
   ProjectModel::GroupNode* group = getSelectedGroupNode();
   m_projectModel->setIdDatabases(group);
-  QString groupName = getGroupName(group);
+  const QString groupName = getGroupName(group);
   QString newName;
   bool ok = true;
-  while (ok && newName.isEmpty())
+
+  while (ok && newName.isEmpty()) {
     newName = QInputDialog::getText(
         this, tr("New Curve"), tr("What should the new Curve in %1 be named?").arg(groupName), QLineEdit::Normal,
         QString::fromStdString(amuse::TableId::CurNameDB->generateDefaultName(amuse::NameDB::Type::Table)), &ok);
-  if (!ok)
+  }
-    return;
 
-  ProjectModel::CurveNode* node = m_projectModel->newCurve(group, newName);
+  if (!ok) {
-  if (node)
+    return;
+  }
+
+  ProjectModel::CurveNode* node = m_projectModel->newCurve(group, std::move(newName));
+  if (node) {
     openEditor(node);
   }
+}
 
 void MainWindow::newKeymapAction() {
   ProjectModel::GroupNode* group = getSelectedGroupNode();
   m_projectModel->setIdDatabases(group);
-  QString groupName = getGroupName(group);
+  const QString groupName = getGroupName(group);
   QString newName;
   bool ok = true;
-  while (ok && newName.isEmpty())
+
+  while (ok && newName.isEmpty()) {
     newName = QInputDialog::getText(
         this, tr("New Keymap"), tr("What should the new Keymap in %1 be named?").arg(groupName), QLineEdit::Normal,
         QString::fromStdString(amuse::KeymapId::CurNameDB->generateDefaultName(amuse::NameDB::Type::Keymap)), &ok);
-  if (!ok)
+  }
-    return;
 
-  ProjectModel::KeymapNode* node = m_projectModel->newKeymap(group, newName);
+  if (!ok) {
-  if (node)
+    return;
+  }
+
+  ProjectModel::KeymapNode* node = m_projectModel->newKeymap(group, std::move(newName));
+  if (node) {
     openEditor(node);
   }
+}
 
 void MainWindow::newLayersAction() {
   ProjectModel::GroupNode* group = getSelectedGroupNode();
   m_projectModel->setIdDatabases(group);
-  QString groupName = getGroupName(group);
+  const QString groupName = getGroupName(group);
   QString newName;
   bool ok = true;
-  while (ok && newName.isEmpty())
+
+  while (ok && newName.isEmpty()) {
     newName = QInputDialog::getText(
         this, tr("New Layers"), tr("What should the new Layers in %1 be named?").arg(groupName), QLineEdit::Normal,
         QString::fromStdString(amuse::LayersId::CurNameDB->generateDefaultName(amuse::NameDB::Type::Layer)), &ok);
-  if (!ok)
+  }
-    return;
 
-  ProjectModel::LayersNode* node = m_projectModel->newLayers(group, newName);
+  if (!ok) {
-  if (node)
+    return;
+  }
+
+  ProjectModel::LayersNode* node = m_projectModel->newLayers(group, std::move(newName));
+  if (node) {
     openEditor(node);
   }
+}
 
 void MainWindow::updateNavigationButtons() {
   m_goForward->setDisabled(m_navIt == m_navList.end() || m_navIt + 1 == m_navList.end());

Editor/ProjectModel.cpp

@@ -410,7 +410,7 @@ void ProjectModel::NameUndoRegistry::unregisterSFXName(amuse::SongId id) {
   amuse::SFXId::CurNameDB->remove(id);
 }
 
-ProjectModel::INode::INode(const QString& name) : m_name(name) {
+ProjectModel::INode::INode(QString name) : m_name(std::move(name)) {
   auto nullNode = amuse::MakeObj<NullNode>(this);
   m_nullChild = nullNode.get();
 }
@@ -506,10 +506,10 @@ bool ProjectModel::clearProjectData() {
   return true;
 }
 
-bool ProjectModel::openGroupData(const QString& groupName, UIMessenger& messenger) {
+bool ProjectModel::openGroupData(QString groupName, UIMessenger& messenger) {
   m_projectDatabase.setIdDatabases();
-  QString path = QFileInfo(m_dir, groupName).filePath();
+  const QString path = QFileInfo(m_dir, groupName).filePath();
-  m_groups.insert(std::make_pair(groupName, std::make_unique<amuse::AudioGroupDatabase>(QStringToSysString(path))));
+  m_groups.emplace(std::move(groupName), std::make_unique<amuse::AudioGroupDatabase>(QStringToSysString(path)));
 
   m_needsReset = true;
   return true;
@@ -543,10 +543,13 @@ void ProjectModel::openSongsData() {
         for (auto& p : dr.getRootNode()->m_mapChildren) {
           char* endPtr;
           amuse::SongId id = uint16_t(strtoul(p.first.c_str(), &endPtr, 16));
-          if (endPtr == p.first.c_str() || id.id == 0xffff)
+
+          if (endPtr == p.first.c_str() || id.id == 0xffff) {
             continue;
+          }
+
           QString path = QString::fromStdString(p.second->m_scalarString);
-          setMIDIPathOfSong(id, path);
+          setMIDIPathOfSong(id, std::move(path));
         }
         _resetSongRefCount();
       }
@@ -1015,11 +1018,12 @@ QVariant ProjectModel::data(const QModelIndex& index, int role) const {
 }
 
 class RenameNodeUndoCommand : public EditorUndoCommand {
-  QString m_redoVal, m_undoVal;
+  QString m_redoVal;
+  QString m_undoVal;
 
 public:
-  RenameNodeUndoCommand(const QString& text, ProjectModel::INode* node, const QString& redoVal)
+  explicit RenameNodeUndoCommand(const QString& text, ProjectModel::INode* node, QString redoVal)
-  : EditorUndoCommand(node, text.arg(node->name())), m_redoVal(redoVal) {}
+  : EditorUndoCommand(node, text.arg(node->name())), m_redoVal(std::move(redoVal)) {}
   void undo() override { g_MainWindow->projectModel()->_renameNode(m_node.get(), m_undoVal); }
   void redo() override {
     m_undoVal = m_node->name();
@@ -1064,25 +1068,28 @@ void ProjectModel::_renameNode(INode* node, const QString& name) {
 }
 
 bool ProjectModel::setData(const QModelIndex& index, const QVariant& value, int role) {
-  if (!index.isValid() || role != Qt::EditRole)
+  if (!index.isValid() || role != Qt::EditRole) {
     return false;
+  }
   assert(index.model() == this && "Not ProjectModel");
 
   INode* item = static_cast<INode*>(index.internalPointer());
-  INode* parent = item->parent();
+  const INode* parent = item->parent();
-  if (!parent)
+  if (!parent) {
-    return false;
-
-  if (item->name() == value.toString())
-    return false;
-
-  if (parent->findChild(value.toString())) {
-    g_MainWindow->uiMessenger().critical(tr("Naming Conflict"),
-                                         tr("%1 already exists in this context").arg(value.toString()));
     return false;
   }
 
-  g_MainWindow->pushUndoCommand(new RenameNodeUndoCommand(tr("Rename %1"), item, value.toString()));
+  QString valueStr = value.toString();
+  if (item->name() == valueStr) {
+    return false;
+  }
+
+  if (parent->findChild(valueStr)) {
+    g_MainWindow->uiMessenger().critical(tr("Naming Conflict"), tr("%1 already exists in this context").arg(valueStr));
+    return false;
+  }
+
+  g_MainWindow->pushUndoCommand(new RenameNodeUndoCommand(tr("Rename %1"), item, std::move(valueStr)));
   return true;
 }
 
@@ -1199,15 +1206,16 @@ std::unique_ptr<amuse::AudioGroupDatabase> ProjectModel::_delNode(GroupNode* nod
   return ret;
 }
 
-ProjectModel::GroupNode* ProjectModel::newSubproject(const QString& name) {
+ProjectModel::GroupNode* ProjectModel::newSubproject(QString name) {
   if (m_groups.find(name) != m_groups.cend()) {
     g_MainWindow->uiMessenger().critical(tr("Subproject Conflict"),
                                          tr("The subproject %1 is already defined").arg(name));
     return nullptr;
   }
-  QString path = QFileInfo(m_dir, name).filePath();
+
+  const QString path = QFileInfo(m_dir, name).filePath();
   auto data = std::make_unique<amuse::AudioGroupDatabase>(QStringToSysString(path));
-  auto node = amuse::MakeObj<GroupNode>(name);
+  auto node = amuse::MakeObj<GroupNode>(std::move(name));
   _buildGroupNodeCollections(*node);
   g_MainWindow->pushUndoCommand(new GroupNodeAddUndoCommand(tr("Add Subproject %1"), std::move(data), node.get()));
   return node.get();
@@ -1286,14 +1294,16 @@ void ProjectModel::_delNode(SoundGroupNode* node, GroupNode* parent, NameUndoReg
   _delGroupNode(node, parent, registry, parent->getAudioGroup()->getProj().sfxGroups());
 }
 
-ProjectModel::SoundGroupNode* ProjectModel::newSoundGroup(GroupNode* group, const QString& name) {
+ProjectModel::SoundGroupNode* ProjectModel::newSoundGroup(GroupNode* group, QString name) {
   setIdDatabases(group);
+
   if (amuse::GroupId::CurNameDB->m_stringToId.find(name.toUtf8().data()) !=
       amuse::GroupId::CurNameDB->m_stringToId.cend()) {
     g_MainWindow->uiMessenger().critical(tr("Sound Group Conflict"), tr("The group %1 is already defined").arg(name));
     return nullptr;
   }
-  auto node = amuse::MakeObj<SoundGroupNode>(name, amuse::MakeObj<amuse::SFXGroupIndex>());
+
+  auto node = amuse::MakeObj<SoundGroupNode>(std::move(name), amuse::MakeObj<amuse::SFXGroupIndex>());
   g_MainWindow->pushUndoCommand(new NodeAddUndoCommand<SoundGroupNode>(tr("Add Sound Group %1"), node.get(), group));
   return node.get();
 }
@@ -1306,14 +1316,16 @@ void ProjectModel::_delNode(SongGroupNode* node, GroupNode* parent, NameUndoRegi
   _delGroupNode(node, parent, registry, parent->getAudioGroup()->getProj().songGroups());
 }
 
-ProjectModel::SongGroupNode* ProjectModel::newSongGroup(GroupNode* group, const QString& name) {
+ProjectModel::SongGroupNode* ProjectModel::newSongGroup(GroupNode* group, QString name) {
   setIdDatabases(group);
+
   if (amuse::GroupId::CurNameDB->m_stringToId.find(name.toUtf8().data()) !=
       amuse::GroupId::CurNameDB->m_stringToId.cend()) {
     g_MainWindow->uiMessenger().critical(tr("Song Group Conflict"), tr("The group %1 is already defined").arg(name));
     return nullptr;
   }
-  auto node = amuse::MakeObj<SongGroupNode>(name, amuse::MakeObj<amuse::SongGroupIndex>());
+
+  auto node = amuse::MakeObj<SongGroupNode>(std::move(name), amuse::MakeObj<amuse::SongGroupIndex>());
   g_MainWindow->pushUndoCommand(new NodeAddUndoCommand<SongGroupNode>(tr("Add Song Group %1"), node.get(), group));
   return node.get();
 }
@@ -1412,20 +1424,23 @@ void ProjectModel::_delNode(SoundMacroNode* node, GroupNode* parent, NameUndoReg
   _delPoolNode(node, parent, registry, parent->getAudioGroup()->getPool().soundMacros());
 }
 
-ProjectModel::SoundMacroNode* ProjectModel::newSoundMacro(GroupNode* group, const QString& name,
+ProjectModel::SoundMacroNode* ProjectModel::newSoundMacro(GroupNode* group, QString name,
                                                           const SoundMacroTemplateEntry* templ) {
   setIdDatabases(group);
+
   if (amuse::SoundMacroId::CurNameDB->m_stringToId.find(name.toUtf8().data()) !=
       amuse::SoundMacroId::CurNameDB->m_stringToId.cend()) {
     g_MainWindow->uiMessenger().critical(tr("Sound Macro Conflict"), tr("The macro %1 is already defined").arg(name));
     return nullptr;
   }
+
   auto dataNode = amuse::MakeObj<amuse::SoundMacro>();
   if (templ) {
     athena::io::MemoryReader r(templ->m_data, templ->m_length);
     dataNode->readCmds<athena::utility::NotSystemEndian>(r, templ->m_length);
   }
-  auto node = amuse::MakeObj<SoundMacroNode>(name, dataNode);
+
+  auto node = amuse::MakeObj<SoundMacroNode>(std::move(name), std::move(dataNode));
   g_MainWindow->pushUndoCommand(new NodeAddUndoCommand<SoundMacroNode>(tr("Add Sound Macro %1"), node.get(), group));
   return node.get();
 }
@@ -1438,16 +1453,18 @@ void ProjectModel::_delNode(ADSRNode* node, GroupNode* parent, NameUndoRegistry&
   _delPoolNode(node, parent, registry, parent->getAudioGroup()->getPool().tables());
 }
 
-ProjectModel::ADSRNode* ProjectModel::newADSR(GroupNode* group, const QString& name) {
+ProjectModel::ADSRNode* ProjectModel::newADSR(GroupNode* group, QString name) {
   setIdDatabases(group);
+
   if (amuse::TableId::CurNameDB->m_stringToId.find(name.toUtf8().data()) !=
       amuse::TableId::CurNameDB->m_stringToId.cend()) {
     g_MainWindow->uiMessenger().critical(tr("ADSR Conflict"), tr("The ADSR %1 is already defined").arg(name));
     return nullptr;
   }
+
   auto dataNode = amuse::MakeObj<std::unique_ptr<amuse::ITable>>();
   *dataNode = std::make_unique<amuse::ADSR>();
-  auto node = amuse::MakeObj<ADSRNode>(name, dataNode);
+  auto node = amuse::MakeObj<ADSRNode>(std::move(name), std::move(dataNode));
   g_MainWindow->pushUndoCommand(new NodeAddUndoCommand<ADSRNode>(tr("Add ADSR %1"), node.get(), group));
   return node.get();
 }
@@ -1460,16 +1477,18 @@ void ProjectModel::_delNode(CurveNode* node, GroupNode* parent, NameUndoRegistry
   _delPoolNode(node, parent, registry, parent->getAudioGroup()->getPool().tables());
 }
 
-ProjectModel::CurveNode* ProjectModel::newCurve(GroupNode* group, const QString& name) {
+ProjectModel::CurveNode* ProjectModel::newCurve(GroupNode* group, QString name) {
   setIdDatabases(group);
+
   if (amuse::TableId::CurNameDB->m_stringToId.find(name.toUtf8().data()) !=
       amuse::TableId::CurNameDB->m_stringToId.cend()) {
     g_MainWindow->uiMessenger().critical(tr("Curve Conflict"), tr("The Curve %1 is already defined").arg(name));
     return nullptr;
   }
+
   auto dataNode = amuse::MakeObj<std::unique_ptr<amuse::ITable>>();
   *dataNode = std::make_unique<amuse::Curve>();
-  auto node = amuse::MakeObj<CurveNode>(name, dataNode);
+  auto node = amuse::MakeObj<CurveNode>(std::move(name), std::move(dataNode));
   g_MainWindow->pushUndoCommand(new NodeAddUndoCommand<CurveNode>(tr("Add Curve %1"), node.get(), group));
   return node.get();
 }
@@ -1482,15 +1501,17 @@ void ProjectModel::_delNode(KeymapNode* node, GroupNode* parent, NameUndoRegistr
   _delPoolNode(node, parent, registry, parent->getAudioGroup()->getPool().keymaps());
 }
 
-ProjectModel::KeymapNode* ProjectModel::newKeymap(GroupNode* group, const QString& name) {
+ProjectModel::KeymapNode* ProjectModel::newKeymap(GroupNode* group, QString name) {
   setIdDatabases(group);
+
   if (amuse::KeymapId::CurNameDB->m_stringToId.find(name.toUtf8().data()) !=
       amuse::KeymapId::CurNameDB->m_stringToId.cend()) {
     g_MainWindow->uiMessenger().critical(tr("Keymap Conflict"), tr("The Keymap %1 is already defined").arg(name));
     return nullptr;
   }
+
   auto dataNode = amuse::MakeObj<std::array<amuse::Keymap, 128>>();
-  auto node = amuse::MakeObj<KeymapNode>(name, dataNode);
+  auto node = amuse::MakeObj<KeymapNode>(std::move(name), std::move(dataNode));
   g_MainWindow->pushUndoCommand(new NodeAddUndoCommand<KeymapNode>(tr("Add Keymap %1"), node.get(), group));
   return node.get();
 }
@@ -1503,16 +1524,19 @@ void ProjectModel::_delNode(LayersNode* node, GroupNode* parent, NameUndoRegistr
   _delPoolNode(node, parent, registry, parent->getAudioGroup()->getPool().layers());
 }
 
-ProjectModel::LayersNode* ProjectModel::newLayers(GroupNode* group, const QString& name) {
+ProjectModel::LayersNode* ProjectModel::newLayers(GroupNode* group, QString name) {
   setIdDatabases(group);
+
   if (amuse::LayersId::CurNameDB->m_stringToId.find(name.toUtf8().data()) !=
       amuse::LayersId::CurNameDB->m_stringToId.cend()) {
     g_MainWindow->uiMessenger().critical(tr("Layers Conflict"), tr("Layers %1 is already defined").arg(name));
     return nullptr;
   }
+
   auto dataNode = amuse::MakeObj<std::vector<amuse::LayerMapping>>();
-  auto node = amuse::MakeObj<LayersNode>(name, dataNode);
+  auto node = amuse::MakeObj<LayersNode>(std::move(name), std::move(dataNode));
   g_MainWindow->pushUndoCommand(new NodeAddUndoCommand<LayersNode>(tr("Add Layers %1"), node.get(), group));
+
   return node.get();
 }
 
@@ -2043,7 +2067,7 @@ QString ProjectModel::getMIDIPathOfSong(amuse::SongId id) const {
   return search->second.m_path;
 }
 
-void ProjectModel::setMIDIPathOfSong(amuse::SongId id, const QString& path) { m_midiFiles[id].m_path = path; }
+void ProjectModel::setMIDIPathOfSong(amuse::SongId id, QString path) { m_midiFiles[id].m_path = std::move(path); }
 
 std::pair<amuse::SongId, std::string> ProjectModel::bootstrapSongId() {
   m_projectDatabase.setIdDatabases();

Editor/ProjectModel.hpp

@@ -125,9 +125,10 @@ public:
 
   public:
     ~INode() override = default;
-    INode(const QString& name);
+    explicit INode(QString name);
-    INode(INode* parent) : m_parent(parent), m_row(0) { /* ONLY USED BY NULL NODE! */
+
-    }
+    // ONLY USED BY NULL NODE!
+    explicit INode(INode* parent) : m_parent(parent), m_row(0) {}
 
     int childCount() const { return int(m_children.size()); }
     INode* child(int row) const {
@@ -219,7 +220,7 @@ public:
     virtual void unregisterNames(NameUndoRegistry& registry) const {}
   };
   struct NullNode final : INode {
-    NullNode(INode* parent) : INode(parent) {}
+    explicit NullNode(INode* parent) : INode(parent) {}
 
     Type type() const override { return Type::Null; }
     QString text() const override { return {}; }
@@ -237,8 +238,8 @@ public:
   struct BasePoolObjectNode;
   struct GroupNode final : INode {
     std::unordered_map<QString, std::unique_ptr<amuse::AudioGroupDatabase>>::iterator m_it;
-    GroupNode(const QString& name) : INode(name) {}
+    explicit GroupNode(QString name) : INode(std::move(name)) {}
-    GroupNode(std::unordered_map<QString, std::unique_ptr<amuse::AudioGroupDatabase>>::iterator it)
+    explicit GroupNode(std::unordered_map<QString, std::unique_ptr<amuse::AudioGroupDatabase>>::iterator it)
     : INode(it->first), m_it(it) {}
 
     int hypotheticalIndex(const QString& name) const override;
@@ -257,9 +258,12 @@ public:
   struct SongGroupNode final : INode {
     amuse::GroupId m_id;
     amuse::ObjToken<amuse::SongGroupIndex> m_index;
-    SongGroupNode(const QString& name, amuse::ObjToken<amuse::SongGroupIndex> index) : INode(name), m_index(index) {}
+    explicit SongGroupNode(QString name, amuse::ObjToken<amuse::SongGroupIndex> index)
-    SongGroupNode(amuse::GroupId id, amuse::ObjToken<amuse::SongGroupIndex> index)
+    : INode(std::move(name)), m_index(std::move(index)) {}
-    : INode(QString::fromUtf8(amuse::GroupId::CurNameDB->resolveNameFromId(id).data())), m_id(id), m_index(index) {}
+    explicit SongGroupNode(amuse::GroupId id, amuse::ObjToken<amuse::SongGroupIndex> index)
+    : INode(QString::fromUtf8(amuse::GroupId::CurNameDB->resolveNameFromId(id).data()))
+    , m_id(id)
+    , m_index(std::move(index)) {}
 
     static QIcon Icon;
     Type type() const override { return Type::SongGroup; }
@@ -283,9 +287,12 @@ public:
   struct SoundGroupNode final : INode {
     amuse::GroupId m_id;
     amuse::ObjToken<amuse::SFXGroupIndex> m_index;
-    SoundGroupNode(const QString& name, amuse::ObjToken<amuse::SFXGroupIndex> index) : INode(name), m_index(index) {}
+    explicit SoundGroupNode(QString name, amuse::ObjToken<amuse::SFXGroupIndex> index)
-    SoundGroupNode(amuse::GroupId id, amuse::ObjToken<amuse::SFXGroupIndex> index)
+    : INode(std::move(name)), m_index(std::move(index)) {}
-    : INode(QString::fromUtf8(amuse::GroupId::CurNameDB->resolveNameFromId(id).data())), m_id(id), m_index(index) {}
+    explicit SoundGroupNode(amuse::GroupId id, amuse::ObjToken<amuse::SFXGroupIndex> index)
+    : INode(QString::fromUtf8(amuse::GroupId::CurNameDB->resolveNameFromId(id).data()))
+    , m_id(id)
+    , m_index(std::move(index)) {}
 
     static QIcon Icon;
     Type type() const override { return Type::SoundGroup; }
@@ -309,8 +316,8 @@ public:
   struct CollectionNode final : INode {
     QIcon m_icon;
     Type m_collectionType;
-    CollectionNode(const QString& name, const QIcon& icon, Type collectionType)
+    explicit CollectionNode(QString name, QIcon icon, Type collectionType)
-    : INode(name), m_icon(icon), m_collectionType(collectionType) {}
+    : INode(std::move(name)), m_icon(std::move(icon)), m_collectionType(collectionType) {}
 
     Type type() const override { return Type::Collection; }
     QString text() const override { return m_name; }
@@ -325,8 +332,8 @@ public:
   };
   struct BasePoolObjectNode : INode {
     amuse::ObjectId m_id;
-    BasePoolObjectNode(const QString& name) : INode(name) {}
+    explicit BasePoolObjectNode(QString name) : INode(std::move(name)) {}
-    BasePoolObjectNode(amuse::ObjectId id, const QString& name) : INode(name), m_id(id) {}
+    explicit BasePoolObjectNode(amuse::ObjectId id, QString name) : INode(std::move(name)), m_id(id) {}
     amuse::ObjectId id() const { return m_id; }
     QString text() const override { return m_name; }
     QIcon icon() const override { return {}; }
@@ -334,9 +341,9 @@ public:
   template <class ID, class T, INode::Type TP>
   struct PoolObjectNode final : BasePoolObjectNode {
     amuse::ObjToken<T> m_obj;
-    PoolObjectNode(const QString& name, amuse::ObjToken<T> obj) : BasePoolObjectNode(name), m_obj(obj) {}
+    PoolObjectNode(QString name, amuse::ObjToken<T> obj) : BasePoolObjectNode(std::move(name)), m_obj(std::move(obj)) {}
     PoolObjectNode(ID id, amuse::ObjToken<T> obj)
-    : BasePoolObjectNode(id, QString::fromUtf8(ID::CurNameDB->resolveNameFromId(id).data())), m_obj(obj) {}
+    : BasePoolObjectNode(id, QString::fromUtf8(ID::CurNameDB->resolveNameFromId(id).data())), m_obj(std::move(obj)) {}
 
     Type type() const override { return TP; }
     AmuseItemEditFlags editFlags() const override { return TP == INode::Type::Sample ? AmuseItemNoCut : AmuseItemAll; }
@@ -368,7 +375,7 @@ public:
   explicit ProjectModel(const QString& path, QObject* parent = Q_NULLPTR);
 
   bool clearProjectData();
-  bool openGroupData(const QString& groupName, UIMessenger& messenger);
+  bool openGroupData(QString groupName, UIMessenger& messenger);
   void openSongsData();
   void importSongsData(const QString& path);
   bool reloadSampleData(const QString& groupName, UIMessenger& messenger);
@@ -402,36 +409,36 @@ public:
   void _preDelNode(INode* n, NameUndoRegistry& registry);
   void _addNode(GroupNode* node, std::unique_ptr<amuse::AudioGroupDatabase>&& data, const NameUndoRegistry& registry);
   std::unique_ptr<amuse::AudioGroupDatabase> _delNode(GroupNode* node, NameUndoRegistry& registry);
-  GroupNode* newSubproject(const QString& name);
+  GroupNode* newSubproject(QString name);
   template <class NT, class T>
   void _addGroupNode(NT* node, GroupNode* parent, const NameUndoRegistry& registry, T& container);
   template <class NT, class T>
   void _delGroupNode(NT* node, GroupNode* parent, NameUndoRegistry& registry, T& container);
   void _addNode(SoundGroupNode* node, GroupNode* parent, const NameUndoRegistry& registry);
   void _delNode(SoundGroupNode* node, GroupNode* parent, NameUndoRegistry& registry);
-  SoundGroupNode* newSoundGroup(GroupNode* group, const QString& name);
+  SoundGroupNode* newSoundGroup(GroupNode* group, QString name);
   void _addNode(SongGroupNode* node, GroupNode* parent, const NameUndoRegistry& registry);
   void _delNode(SongGroupNode* node, GroupNode* parent, NameUndoRegistry& registry);
-  SongGroupNode* newSongGroup(GroupNode* group, const QString& name);
+  SongGroupNode* newSongGroup(GroupNode* group, QString name);
   template <class NT, class T>
   void _addPoolNode(NT* node, GroupNode* parent, const NameUndoRegistry& registry, T& container);
   template <class NT, class T>
   void _delPoolNode(NT* node, GroupNode* parent, NameUndoRegistry& registry, T& container);
   void _addNode(SoundMacroNode* node, GroupNode* parent, const NameUndoRegistry& registry);
   void _delNode(SoundMacroNode* node, GroupNode* parent, NameUndoRegistry& registry);
-  SoundMacroNode* newSoundMacro(GroupNode* group, const QString& name, const SoundMacroTemplateEntry* templ = nullptr);
+  SoundMacroNode* newSoundMacro(GroupNode* group, QString name, const SoundMacroTemplateEntry* templ = nullptr);
   void _addNode(ADSRNode* node, GroupNode* parent, const NameUndoRegistry& registry);
   void _delNode(ADSRNode* node, GroupNode* parent, NameUndoRegistry& registry);
-  ADSRNode* newADSR(GroupNode* group, const QString& name);
+  ADSRNode* newADSR(GroupNode* group, QString name);
   void _addNode(CurveNode* node, GroupNode* parent, const NameUndoRegistry& registry);
   void _delNode(CurveNode* node, GroupNode* parent, NameUndoRegistry& registry);
-  CurveNode* newCurve(GroupNode* group, const QString& name);
+  CurveNode* newCurve(GroupNode* group, QString name);
   void _addNode(KeymapNode* node, GroupNode* parent, const NameUndoRegistry& registry);
   void _delNode(KeymapNode* node, GroupNode* parent, NameUndoRegistry& registry);
-  KeymapNode* newKeymap(GroupNode* group, const QString& name);
+  KeymapNode* newKeymap(GroupNode* group, QString name);
   void _addNode(LayersNode* node, GroupNode* parent, const NameUndoRegistry& registry);
   void _delNode(LayersNode* node, GroupNode* parent, NameUndoRegistry& registry);
-  LayersNode* newLayers(GroupNode* group, const QString& name);
+  LayersNode* newLayers(GroupNode* group, QString name);
   void _renameNode(INode* node, const QString& name);
 
   template <class NT>
@@ -458,7 +465,7 @@ public:
 
   GroupNode* getGroupOfSfx(amuse::SFXId id) const;
   QString getMIDIPathOfSong(amuse::SongId id) const;
-  void setMIDIPathOfSong(amuse::SongId id, const QString& path);
+  void setMIDIPathOfSong(amuse::SongId id, QString path);
   std::pair<amuse::SongId, std::string> bootstrapSongId();
   void allocateSongId(amuse::SongId id, std::string_view name);
   void deallocateSongId(amuse::SongId oldId);