feat(game): add persistent selection counter overlay.

Display total count of selected cards in bottom-right corner when multiple cards are selected.
Updates on selection changes and window resize.
The counter connects to QGraphicsScene::selectionChanged to stay up-to-date without requiring manual refresh.
Adds user setting to enable/disable the total count overlay.

cockatrice/src/client/settings/cache_settings.cpp

@@ -285,6 +285,7 @@ SettingsCache::SettingsCache()
     focusCardViewSearchBar = settings->value("interface/focusCardViewSearchBar", true).toBool();
 
     showDragSelectionCount = settings->value("interface/showlassoselectioncount", true).toBool();
+    showTotalSelectionCount = settings->value("interface/showpersistentselectioncount", true).toBool();
 
     showShortcuts = settings->value("menu/showshortcuts", true).toBool();
     showGameSelectorFilterToolbar = settings->value("menu/showgameselectorfiltertoolbar", true).toBool();
@@ -1316,6 +1317,12 @@ void SettingsCache::setShowDragSelectionCount(QT_STATE_CHANGED_T _showDragSelect
     settings->setValue("interface/showlassoselectioncount", showDragSelectionCount);
 }
 
+void SettingsCache::setShowTotalSelectionCount(QT_STATE_CHANGED_T _showTotalSelectionCount)
+{
+    showTotalSelectionCount = static_cast<bool>(_showTotalSelectionCount);
+    settings->setValue("interface/showpersistentselectioncount", showTotalSelectionCount);
+}
+
 void SettingsCache::loadPaths()
 {
     QString dataPath = getDataPath();

cockatrice/src/client/settings/cache_settings.h

@@ -341,6 +341,7 @@ private:
     bool roundCardCorners;
     bool showStatusBar;
     bool showDragSelectionCount;
+    bool showTotalSelectionCount;
 
 public:
     SettingsCache();
@@ -460,6 +461,10 @@ public:
     {
         return showDragSelectionCount;
     }
+    [[nodiscard]] bool getShowTotalSelectionCount() const
+    {
+        return showTotalSelectionCount;
+    }
     [[nodiscard]] bool getNotificationsEnabled() const
     {
         return notificationsEnabled;
@@ -1126,5 +1131,6 @@ public slots:
     void setMaxFontSize(int _max);
     void setRoundCardCorners(bool _roundCardCorners);
     void setShowDragSelectionCount(QT_STATE_CHANGED_T _showDragSelectionCount);
+    void setShowTotalSelectionCount(QT_STATE_CHANGED_T _showTotalSelectionCount);
 };
 #endif

cockatrice/src/game/game_view.cpp

@@ -42,6 +42,7 @@ GameView::GameView(GameScene *scene, QWidget *parent) : QGraphicsView(scene, par
     connect(scene, &GameScene::sigStartRubberBand, this, &GameView::startRubberBand);
     connect(scene, &GameScene::sigResizeRubberBand, this, &GameView::resizeRubberBand);
     connect(scene, &GameScene::sigStopRubberBand, this, &GameView::stopRubberBand);
+    connect(scene, &QGraphicsScene::selectionChanged, this, [this]() { updateTotalSelectionCount(); });
 
     aCloseMostRecentZoneView = new QAction(this);
 
@@ -63,6 +64,10 @@ GameView::GameView(GameScene *scene, QWidget *parent) : QGraphicsView(scene, par
     dragCountLabel->setStyleSheet(countLabelStyle);
     dragCountLabel->hide();
     dragCountLabel->raise();
+
+    totalCountLabel = new QLabel(this);
+    totalCountLabel->setStyleSheet(countLabelStyle);
+    totalCountLabel->hide();
 }
 
 void GameView::resizeEvent(QResizeEvent *event)
@@ -74,6 +79,7 @@ void GameView::resizeEvent(QResizeEvent *event)
         s->processViewSizeChange(event->size());
 
     updateSceneRect(scene()->sceneRect());
+    updateTotalSelectionCount(event->size());
 }
 
 void GameView::updateSceneRect(const QRectF &rect)
@@ -151,3 +157,28 @@ void GameView::refreshShortcuts()
     aCloseMostRecentZoneView->setShortcuts(
         SettingsCache::instance().shortcuts().getShortcut("Player/aCloseMostRecentZoneView"));
 }
+
+void GameView::updateTotalSelectionCount(const QSize &viewSize)
+{
+    if (!SettingsCache::instance().getShowTotalSelectionCount()) {
+        totalCountLabel->hide();
+        return;
+    }
+
+    int count = scene()->selectedItems().count();
+
+    if (count > 1) {
+        totalCountLabel->setText(QString::number(count));
+        totalCountLabel->adjustSize();
+
+        constexpr int kMarginInPixels = 10;
+        int availableWidth = viewSize.isValid() ? viewSize.width() : viewport()->width();
+        int availableHeight = viewSize.isValid() ? viewSize.height() : viewport()->height();
+        int x = availableWidth - totalCountLabel->width() - kMarginInPixels;
+        int y = availableHeight - totalCountLabel->height() - kMarginInPixels;
+        totalCountLabel->move(x, y);
+        totalCountLabel->show();
+    } else {
+        totalCountLabel->hide();
+    }
+}

cockatrice/src/game/game_view.h

@@ -20,6 +20,7 @@ private:
     QAction *aCloseMostRecentZoneView;
     QRubberBand *rubberBand;
     QLabel *dragCountLabel;
+    QLabel *totalCountLabel;
     QPointF selectionOrigin;
 
 protected:
@@ -29,6 +30,7 @@ private slots:
     void resizeRubberBand(const QPointF &cursorPoint, int selectedCount);
     void stopRubberBand();
     void refreshShortcuts();
+    void updateTotalSelectionCount(const QSize &viewSize = QSize());
 public slots:
     void updateSceneRect(const QRectF &rect);
 

cockatrice/src/interface/widgets/dialogs/dlg_settings.cpp

@@ -825,6 +825,10 @@ UserInterfaceSettingsPage::UserInterfaceSettingsPage()
     connect(&showDragSelectionCountCheckBox, &QCheckBox::QT_STATE_CHANGED, &SettingsCache::instance(),
             &SettingsCache::setShowDragSelectionCount);
 
+    showTotalSelectionCountCheckBox.setChecked(SettingsCache::instance().getShowTotalSelectionCount());
+    connect(&showTotalSelectionCountCheckBox, &QCheckBox::QT_STATE_CHANGED, &SettingsCache::instance(),
+            &SettingsCache::setShowTotalSelectionCount);
+
     useTearOffMenusCheckBox.setChecked(SettingsCache::instance().getUseTearOffMenus());
     connect(&useTearOffMenusCheckBox, &QCheckBox::QT_STATE_CHANGED, &SettingsCache::instance(),
             [](const QT_STATE_CHANGED_T state) { SettingsCache::instance().setUseTearOffMenus(state == Qt::Checked); });
@@ -838,7 +842,8 @@ UserInterfaceSettingsPage::UserInterfaceSettingsPage()
     generalGrid->addWidget(&focusCardViewSearchBarCheckBox, 5, 0);
     generalGrid->addWidget(&annotateTokensCheckBox, 6, 0);
     generalGrid->addWidget(&showDragSelectionCountCheckBox, 7, 0);
-    generalGrid->addWidget(&useTearOffMenusCheckBox, 8, 0);
+    generalGrid->addWidget(&showTotalSelectionCountCheckBox, 8, 0);
+    generalGrid->addWidget(&useTearOffMenusCheckBox, 9, 0);
 
     generalGroupBox = new QGroupBox;
     generalGroupBox->setLayout(generalGrid);
@@ -961,6 +966,7 @@ void UserInterfaceSettingsPage::retranslateUi()
     focusCardViewSearchBarCheckBox.setText(tr("Auto focus search bar when card view window is opened"));
     annotateTokensCheckBox.setText(tr("Annotate card text on tokens"));
     showDragSelectionCountCheckBox.setText(tr("Show selection counter during drag selection"));
+    showTotalSelectionCountCheckBox.setText(tr("Show total selection counter"));
     useTearOffMenusCheckBox.setText(tr("Use tear-off menus, allowing right click menus to persist on screen"));
     notificationsGroupBox->setTitle(tr("Notifications settings"));
     notificationsEnabledCheckBox.setText(tr("Enable notifications in taskbar"));

cockatrice/src/interface/widgets/dialogs/dlg_settings.h

@@ -172,6 +172,7 @@ private:
     QCheckBox focusCardViewSearchBarCheckBox;
     QCheckBox annotateTokensCheckBox;
     QCheckBox showDragSelectionCountCheckBox;
+    QCheckBox showTotalSelectionCountCheckBox;
     QCheckBox useTearOffMenusCheckBox;
     QCheckBox tapAnimationCheckBox;
     QCheckBox openDeckInNewTabCheckBox;