much faster label menu showing

src/librssguard/database/databasequeries.cpp

@@ -709,6 +709,75 @@ QMap<QString, ArticleCounts> DatabaseQueries::getMessageCountsForAllLabels(const
   return counts;
 }
 
+QMap<QString, ArticleCounts> DatabaseQueries::getCountOfAssignedLabelsToMessages(const QSqlDatabase& db,
+                                                                                 const QList<Message>& messages,
+                                                                                 int account_id,
+                                                                                 bool* ok) {
+  QMap<QString, ArticleCounts> counts;
+  QSqlQuery q(db);
+
+  q.setForwardOnly(true);
+
+  auto msgs_std = boolinq::from(messages)
+                    .select([](const Message& msg) {
+                      return QSL("m.custom_id = '%1'").arg(msg.m_customId);
+                    })
+                    .toStdList();
+
+  QStringList msgs_lst = FROM_STD_LIST(QStringList, msgs_std);
+  auto msgs = msgs_lst.join(QSL(" OR "));
+
+  if (db.driverName() == QSL(APP_DB_MYSQL_DRIVER)) {
+    q.prepare(QSL("SELECT l.custom_id, CONCAT('%.', l.id,'.%') pid, SUM(m.is_read), COUNT(*) FROM Labels l "
+                  "INNER JOIN Messages m "
+                  "  ON m.account_id = l.account_id AND m.labels LIKE pid "
+                  "WHERE "
+                  "  m.is_deleted = 0 AND "
+                  "  m.is_pdeleted = 0 AND "
+                  "  m.account_id = :account_id AND "
+                  " (%1) "
+                  "GROUP BY pid;")
+                .arg(msgs));
+  }
+  else {
+    q.prepare(QSL("SELECT l.custom_id, ('%.' || l.id || '.%') pid, SUM(m.is_read), COUNT(*) FROM Labels l "
+                  "INNER JOIN Messages m "
+                  "  ON m.account_id = l.account_id AND m.labels LIKE pid "
+                  "WHERE "
+                  "  m.is_deleted = 0 AND "
+                  "  m.is_pdeleted = 0 AND "
+                  "  m.account_id = :account_id AND "
+                  " (%1) "
+                  "GROUP BY pid;")
+                .arg(msgs));
+  }
+
+  q.bindValue(QSL(":account_id"), account_id);
+
+  if (q.exec()) {
+    while (q.next()) {
+      QString lbl_custom_id = q.value(0).toString();
+      ArticleCounts ac;
+
+      ac.m_total = q.value(3).toInt();
+      ac.m_unread = ac.m_total - q.value(2).toInt();
+
+      counts.insert(lbl_custom_id, ac);
+    }
+
+    if (ok != nullptr) {
+      *ok = true;
+    }
+  }
+  else {
+    if (ok != nullptr) {
+      *ok = false;
+    }
+  }
+
+  return counts;
+}
+
 ArticleCounts DatabaseQueries::getImportantMessageCounts(const QSqlDatabase& db, int account_id, bool* ok) {
   QSqlQuery q(db);
 

src/librssguard/database/databasequeries.h

@@ -93,6 +93,10 @@ class DatabaseQueries {
     static QMap<QString, ArticleCounts> getMessageCountsForAllLabels(const QSqlDatabase& db,
                                                                      int account_id,
                                                                      bool* ok = nullptr);
+    static QMap<QString, ArticleCounts> getCountOfAssignedLabelsToMessages(const QSqlDatabase& db,
+                                                                           const QList<Message>& messages,
+                                                                           int account_id,
+                                                                           bool* ok = nullptr);
 
     static ArticleCounts getImportantMessageCounts(const QSqlDatabase& db, int account_id, bool* ok = nullptr);
     static int getUnreadMessageCounts(const QSqlDatabase& db, int account_id, bool* ok = nullptr);

src/librssguard/gui/reusable/labelsmenu.cpp

@@ -23,6 +23,12 @@ LabelsMenu::LabelsMenu(const QList<Message>& messages, const QList<Label*>& labe
   }
   else {
     QSqlDatabase db = qApp->database()->driver()->connection(QSL("LabelsMenu"));
+    QMap<QString, ArticleCounts> assignments =
+      labels.isEmpty()
+        ? QMap<QString, ArticleCounts>()
+        : DatabaseQueries::getCountOfAssignedLabelsToMessages(db,
+                                                              messages,
+                                                              labels.first()->getParentServiceRoot()->accountId());
 
     for (Label* label : boolinq::from(labels)
                           .orderBy([](const Label* label) {
@@ -30,17 +36,13 @@ LabelsMenu::LabelsMenu(const QList<Message>& messages, const QList<Label*>& labe
                           })
                           .toStdList()) {
 
-      auto count = boolinq::from(messages).count([&db, label](const Message& msg) {
-        // TODO: slow
-        return DatabaseQueries::isLabelAssignedToMessage(db, label, msg);
-      });
-
+      auto count = assignments.value(label->customId());
       Qt::CheckState state = Qt::CheckState::Unchecked;
 
-      if (count == messages.size()) {
+      if (count.m_total == messages.size()) {
         state = Qt::CheckState::Checked;
       }
-      else if (count > 0) {
+      else if (count.m_total > 0) {
         state = Qt::CheckState::PartiallyChecked;
       }
 

src/librssguard/services/abstract/labelsnode.cpp

@@ -61,6 +61,11 @@ int LabelsNode::countOfAllMessages() const {
 }
 
 void LabelsNode::updateCounts(bool including_total_count) {
+  // TODO: This is still rather slow because this is automatically
+  // called when message is marked (un)read or starred.
+  // It would be enought if only labels which are assigned to article
+  // are recounted, not all.
+
   QSqlDatabase database = qApp->database()->driver()->threadSafeConnection(metaObject()->className());
   int account_id = getParentServiceRoot()->accountId();
   auto acc = DatabaseQueries::getMessageCountsForAllLabels(database, account_id);