feat(niri/workspaces): Add enable-bar-scroll option

include/modules/niri/workspaces.hpp

@@ -20,6 +20,7 @@ class Workspaces : public AModule, public EventHandler {
   void doUpdate();
   Gtk::Button& addButton(const Json::Value& ws);
   std::string getIcon(const std::string& value, const Json::Value& ws);
+  bool handleScroll(GdkEventScroll* /*unused*/) override;
 
   const Bar& bar_;
   Gtk::Box box_;

man/waybar-niri-workspaces.5.scd

@@ -31,6 +31,11 @@ Addressed by *niri/workspaces*
 	default: false ++
 	If set to false, you can click to change workspace. If set to true this behaviour is disabled.
 
+*enable-bar-scroll*: ++
+	typeof: bool ++
+	default: false ++
+	If set to false, you can't scroll to cycle throughout workspaces from the entire bar. If set to true this behaviour is enabled.
+
 *disable-markup*: ++
 	typeof: bool ++
 	default: false ++

src/modules/niri/workspaces.cpp

@@ -22,6 +22,12 @@ Workspaces::Workspaces(const std::string& id, const Bar& bar, const Json::Value&
   gIPC->registerForIPC("WorkspaceActiveWindowChanged", this);
   gIPC->registerForIPC("WorkspaceUrgencyChanged", this);
 
+  if (config["enable-bar-scroll"].asBool()) {
+    auto& window = const_cast<Bar&>(bar_).window;
+    window.add_events(Gdk::SCROLL_MASK | Gdk::SMOOTH_SCROLL_MASK);
+    window.signal_scroll_event().connect(sigc::mem_fun(*this, &Workspaces::handleScroll));
+  }
+
   dp.emit();
 }
 
@@ -198,4 +204,43 @@ std::string Workspaces::getIcon(const std::string& value, const Json::Value& ws)
   return value;
 }
 
+bool Workspaces::handleScroll(GdkEventScroll* e) {
+  if (gdk_event_get_pointer_emulated((GdkEvent*)e) != 0) {
+    /**
+     * Ignore emulated scroll events on window
+     */
+    return false;
+  }
+
+  auto dir = AModule::getScrollDir(e);
+  if (dir == SCROLL_DIR::NONE) {
+    return true;
+  }
+
+  try {
+    Json::Value request(Json::objectValue);
+    auto& action = (request["Action"] = Json::Value(Json::objectValue));
+
+    std::string action_name;
+
+    if (dir == SCROLL_DIR::DOWN || dir == SCROLL_DIR::RIGHT) {
+      action_name = "FocusWorkspaceDown";
+    } else if (dir == SCROLL_DIR::UP || dir == SCROLL_DIR::LEFT) {
+      action_name = "FocusWorkspaceUp";
+    } else {
+      return true;
+    }
+
+    action[action_name] = Json::Value(Json::objectValue);
+
+    IPC::send(request);
+
+  } catch (const std::exception& e) {
+    spdlog::error("Workspaces: {}", e.what());
+    return false;
+  }
+
+  return true;
+}
+
 }  // namespace waybar::modules::niri