added output class to dwl/mangowm allowing tags to display differently when the output is focused (for multi-monitor setups)

src/modules/dwl/tags.cpp

@@ -26,7 +26,7 @@ static void toggle_visibility(void* data, zdwl_ipc_output_v2* zdwl_output_v2) {
 }
 
 static void active(void* data, zdwl_ipc_output_v2* zdwl_output_v2, uint32_t active) {
-  // Intentionally empty
+  static_cast<Tags*>(data)->handle_active_output(zdwl_output_v2, active);
 }
 
 static void set_tag(void* data, zdwl_ipc_output_v2* zdwl_output_v2, uint32_t tag, uint32_t state,
@@ -163,7 +163,7 @@ Tags::Tags(const std::string& id, const waybar::Bar& bar, const Json::Value& con
     i <<= 1;
   }
 
-  struct wl_output* output = gdk_wayland_monitor_get_wl_output(bar_.output->monitor->gobj());
+  struct wl_output *output = gdk_wayland_monitor_get_wl_output(bar_.output->monitor->gobj());
   output_status_ = zdwl_ipc_manager_v2_get_output(status_manager_, output);
   zdwl_ipc_output_v2_add_listener(output_status_, &output_status_listener_impl, this);
 
@@ -223,4 +223,16 @@ void Tags::handle_view_tags(uint32_t tag, uint32_t state, uint32_t clients, uint
   }
 }
 
+void Tags::handle_active_output(zdwl_ipc_output_v2* zdwl_output_v2, uint32_t active) {
+  if (output_status_ == zdwl_output_v2) {
+    for (size_t i = 0; i < buttons_.size(); ++i) {
+      if (active == 0) {
+        buttons_[i].get_style_context()->remove_class("output");
+      } else {
+        buttons_[i].get_style_context()->add_class("output");
+      }
+    }
+  }
+}
+
 } /* namespace waybar::modules::dwl */

src/modules/river/tags.cpp

@@ -114,8 +114,8 @@ Tags::Tags(const std::string& id, const waybar::Bar& bar, const Json::Value& con
       control_{nullptr},
       seat_{nullptr},
       bar_(bar),
-      box_{bar.orientation, 0},
       output_{nullptr},
+      box_{bar.orientation, 0},
       output_status_{nullptr},
       seat_status_{nullptr} {
   struct wl_display* display = Client::inst()->wl_display;
@@ -204,8 +204,7 @@ Tags::~Tags() {
 
 void Tags::handle_show() {
   if (!status_manager_) return;
-  struct wl_output* output = gdk_wayland_monitor_get_wl_output(bar_.output->monitor->gobj());
-  output_status_ = zriver_status_manager_v1_get_river_output_status(status_manager_, output);
+  output_status_ = zriver_status_manager_v1_get_river_output_status(status_manager_, output_);
   zriver_output_status_v1_add_listener(output_status_, &output_status_listener_impl, this);
 
   seat_status_ = zriver_status_manager_v1_get_river_seat_status(status_manager_, seat_);