feat(widgets): add hide when unread option to notification widget

assets/translations/en.json

@@ -939,6 +939,10 @@
           "label": "Hide When Off",
           "description": "Hide the lock key indicator when inactive"
         },
+        "hide_when_no_unread": {
+          "label": "Hide When No New",
+          "description": "Hide the notifications widget when there are no unread notifications"
+        },
         "high_color": {
           "label": "High Color",
           "description": "Color used for high visualizer values"

example.toml

@@ -260,3 +260,6 @@ battery_low_percent_threshold = 0   # set to e.g. 15 to enable battery_under_thr
 
 # [widget.control-center]
 # use_distro_logo = true
+
+# [widget.notifications]
+# hide_when_no_unread = true

src/shell/bar/widget_factory.cpp

@@ -246,7 +246,8 @@ std::unique_ptr<Widget> WidgetFactory::create(const std::string& name, wl_output
   }
 
   if (type == "notifications") {
-    auto widget = std::make_unique<NotificationWidget>(m_notifications, output);
+    const bool hideWhenNoUnread = wc != nullptr ? wc->getBool("hide_when_no_unread", false) : false;
+    auto widget = std::make_unique<NotificationWidget>(m_notifications, output, hideWhenNoUnread);
     widget->setContentScale(contentScale);
     return widget;
   }

src/shell/bar/widgets/notification_widget.cpp

@@ -15,8 +15,8 @@ namespace {
   constexpr float kDotBaseSize = 6.0f;
 } // namespace
 
-NotificationWidget::NotificationWidget(NotificationManager* manager, wl_output* output)
-    : m_manager(manager), m_output(output) {}
+NotificationWidget::NotificationWidget(NotificationManager* manager, wl_output* output, bool hideWhenNoUnread)
+    : m_manager(manager), m_output(output), m_hideWhenNoUnread(hideWhenNoUnread) {}
 
 void NotificationWidget::create() {
   auto area = std::make_unique<InputArea>();
@@ -80,6 +80,13 @@ void NotificationWidget::doUpdate(Renderer& /*renderer*/) { refreshIndicatorStat
 void NotificationWidget::refreshIndicatorState() {
   const bool hasNotifications = (m_manager != nullptr) && m_manager->hasUnreadNotificationHistory();
   const bool dndEnabled = (m_manager != nullptr) && m_manager->doNotDisturb();
+
+  if (Node* rootNode = root(); rootNode != nullptr) {
+    const bool showWidget = !m_hideWhenNoUnread || hasNotifications;
+    rootNode->setVisible(showWidget);
+    rootNode->setParticipatesInLayout(showWidget);
+  }
+
   if (hasNotifications == m_hasNotifications && dndEnabled == m_dndEnabled) {
     return;
   }

src/shell/bar/widgets/notification_widget.h

@@ -9,7 +9,7 @@ class NotificationManager;
 
 class NotificationWidget : public Widget {
 public:
-  NotificationWidget(NotificationManager* manager, wl_output* output);
+  NotificationWidget(NotificationManager* manager, wl_output* output, bool hideWhenNoUnread = false);
 
   void create() override;
 
@@ -22,6 +22,7 @@ private:
   wl_output* m_output = nullptr;
   Glyph* m_glyph = nullptr;
   Node* m_dot = nullptr;
+  bool m_hideWhenNoUnread = false;
   bool m_hasNotifications = false;
   bool m_dndEnabled = false;
 };

src/shell/settings/widget_settings_registry.cpp

@@ -458,6 +458,8 @@ namespace settings {
       add(doubleSpec("art_size", 16.0, 8.0, 96.0, 1.0));
     } else if (type == "network") {
       add(boolSpec("show_label", true));
+    } else if (type == "notifications") {
+      add(boolSpec("hide_when_no_unread", false));
     } else if (type == "scripted") {
       add(stringSpec("script"));
       add(boolSpec("hot_reload", false, true));