tray: Update module using callback

include/events/signal.hpp

@@ -101,9 +101,6 @@ namespace signals {
   } // namespace ui
 
   namespace ui_tray {
-    struct tray_width_change : public detail::base_signal<tray_width_change> {
-      using base_type::base_type;
-    };
     struct tray_pos_change : public detail::value_signal<tray_pos_change, int> {
       using base_type::base_type;
     };

include/events/signal_fwd.hpp

@@ -35,7 +35,6 @@ namespace signals {
     struct update_geometry;
   } // namespace ui
   namespace ui_tray {
-    struct tray_width_change;
     struct tray_pos_change;
     struct tray_visibility;
   } // namespace ui_tray

include/modules/tray.hpp

@@ -7,8 +7,7 @@
 
 POLYBAR_NS
 namespace modules {
-  class tray_module : public static_module<tray_module>,
-                      public signal_receiver<SIGN_PRIORITY_TRAY, signals::ui_tray::tray_width_change> {
+  class tray_module : public static_module<tray_module> {
    public:
     explicit tray_module(const bar_settings& bar_settings, string name_);
     string get_format() const;
@@ -17,9 +16,6 @@ namespace modules {
 
     bool build(builder* builder, const string& tag) const;
     void update() {}
-    void teardown();
-
-    bool on(const signals::ui_tray::tray_width_change& evt) override;
 
     static constexpr auto TYPE = "internal/tray";
 

include/x11/tray_manager.hpp

@@ -56,16 +56,15 @@ struct tray_settings {
   xcb_window_t selection_owner{XCB_NONE};
 };
 
+using on_update = std::function<void(void)>;
+
 class tray_manager : public xpp::event::sink<evt::expose, evt::visibility_notify, evt::client_message,
                          evt::configure_request, evt::resize_request, evt::selection_clear, evt::property_notify,
                          evt::reparent_notify, evt::destroy_notify, evt::map_notify, evt::unmap_notify>,
                      public signal_receiver<SIGN_PRIORITY_TRAY, signals::ui::update_background,
                          signals::ui_tray::tray_pos_change, signals::ui_tray::tray_visibility> {
  public:
-  using make_type = unique_ptr<tray_manager>;
-  static make_type make(const bar_settings& bar_opts);
-
-  explicit tray_manager(connection& conn, signal_emitter& emitter, const logger& logger, const bar_settings& bar_opts);
+  explicit tray_manager(connection& conn, signal_emitter& emitter, const logger& logger, const bar_settings& bar_opts, on_update on_update);
 
   ~tray_manager();
 
@@ -107,7 +106,7 @@ class tray_manager : public xpp::event::sink<evt::expose, evt::visibility_notify
 
   int calculate_client_y();
 
-  void update_width(unsigned new_width);
+  void update_width();
 
   bool is_embedded(const xcb_window_t& win) const;
   tray_client* find_client(const xcb_window_t& win);
@@ -140,6 +139,8 @@ class tray_manager : public xpp::event::sink<evt::expose, evt::visibility_notify
   tray_settings m_opts{};
   const bar_settings& m_bar_opts;
 
+  const on_update m_on_update;
+
   /**
    * Systray selection atom _NET_SYSTEM_TRAY_Sn
    */

src/modules/tray.cpp

@@ -9,9 +9,8 @@ namespace modules {
 
   tray_module::tray_module(const bar_settings& bar_settings, string name_)
       : static_module<tray_module>(bar_settings, move(name_))
-      , m_tray(connection::make(), signal_emitter::make(), m_log, bar_settings) {
+      , m_tray(connection::make(), signal_emitter::make(), m_log, bar_settings, [&] { this->broadcast(); }) {
     m_formatter->add(DEFAULT_FORMAT, TAG_TRAY, {TAG_TRAY});
-    m_sig.attach(this);
   }
 
   string tray_module::get_format() const {
@@ -33,17 +32,5 @@ namespace modules {
     return false;
   }
 
-  /**
-   * TODO Replace signal with callback passed to tray.
-   */
-  bool tray_module::on(const signals::ui_tray::tray_width_change&) {
-    broadcast();
-    return true;
-  }
-
-  void tray_module::teardown() {
-    m_sig.detach(this);
-  }
-
 } // namespace modules
 POLYBAR_NS_END

src/x11/tray_manager.cpp

@@ -25,6 +25,16 @@
  * Tray implementation according to the System Tray Protocol.
  *
  * Ref: https://specifications.freedesktop.org/systemtray-spec/systemtray-spec-latest.html
+ *
+ * This class manages embedded tray icons by placing them on the bar in the correct position; the position itself is
+ * requested by the renderer.
+ *
+ * The tray manager needs to trigger bar updates only when the size of the entire tray changes (e.g. when tray icons are
+ * added/removed). EVerything else can be handled without an update.
+ *
+ * TODO
+ *  * Better handling of state:
+ *    * Differentiate between, inactive, active, and waiting for selection
  */
 
 // ====================================================================================================
@@ -44,16 +54,9 @@
 
 POLYBAR_NS
 
-/**
- * Create instance
- */
-tray_manager::make_type tray_manager::make(const bar_settings& bar_opts) {
-  return std::make_unique<tray_manager>(connection::make(), signal_emitter::make(), logger::make(), bar_opts);
-}
-
 tray_manager::tray_manager(
-    connection& conn, signal_emitter& emitter, const logger& logger, const bar_settings& bar_opts)
-    : m_connection(conn), m_sig(emitter), m_log(logger), m_bar_opts(bar_opts) {
+    connection& conn, signal_emitter& emitter, const logger& logger, const bar_settings& bar_opts, on_update on_update)
+    : m_connection(conn), m_sig(emitter), m_log(logger), m_bar_opts(bar_opts), m_on_update(on_update) {
   m_connection.attach_sink(this, SINK_PRIORITY_TRAY);
 }
 
@@ -174,8 +177,7 @@ void tray_manager::deactivate(bool clear_selection) {
 
   m_connection.flush();
 
-  // TODO update through module
-  m_sig.emit(signals::eventqueue::notify_forcechange{});
+  reconfigure_window();
 }
 
 /**
@@ -186,11 +188,7 @@ void tray_manager::reconfigure() {
     return;
   }
 
-  try {
-    reconfigure_window();
-  } catch (const exception& err) {
-    m_log.err("Failed to reconfigure tray window (%s)", err.what());
-  }
+  reconfigure_window();
 
   try {
     reconfigure_clients();
@@ -199,23 +197,26 @@ void tray_manager::reconfigure() {
   }
 
   m_connection.flush();
-
-  // TODO update through module
-  m_sig.emit(signals::eventqueue::notify_forcechange{});
 }
 
 /**
  * Reconfigure container window
+ *
+ * TODO should we call update_width directly?
  */
 void tray_manager::reconfigure_window() {
   m_log.trace("tray: Reconfigure window (hidden=%i, clients=%i)", static_cast<bool>(m_hidden), m_clients.size());
-  update_width(calculate_w());
+  update_width();
 }
 
-void tray_manager::update_width(unsigned new_width) {
+/**
+ * TODO make sure this is always called when m_clients changes
+ */
+void tray_manager::update_width() {
+  unsigned new_width = calculate_w();
   if (m_tray_width != new_width) {
     m_tray_width = new_width;
-    m_sig.emit(signals::ui_tray::tray_width_change{});
+    m_on_update();
   }
 }