add reverse-scroll option for xworkspaces module (#2365)

* add reverse-scroll option for xworkspaces module

* move use of reverse-scroll option to when producing scroll action

* documented xworkspaces reverse-scroll option in changelog

CHANGELOG.md

@@ -50,6 +50,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   repository.
 
 ### Added
+- `internal/xworkspaces`: `reverse-scroll` can be used to reverse the scroll
+  direction when cycling through desktops.
 - The backslash escape character (\\).
   [`#2354`](https://github.com/polybar/polybar/issues/2354)
 - Warn states for the cpu, memory, fs, and battery modules.

include/modules/xworkspaces.hpp

@@ -112,6 +112,7 @@ namespace modules {
     bool m_pinworkspaces{false};
     bool m_click{true};
     bool m_scroll{true};
+    bool m_revscroll{false};
     size_t m_index{0};
 
     // The following mutex is here to protect the data of this modules.

src/modules/xworkspaces.cpp

@@ -43,6 +43,7 @@ namespace modules {
     m_pinworkspaces = m_conf.get(name(), "pin-workspaces", m_pinworkspaces);
     m_click = m_conf.get(name(), "enable-click", m_click);
     m_scroll = m_conf.get(name(), "enable-scroll", m_scroll);
+    m_revscroll = m_conf.get(name(), "reverse-scroll", m_revscroll);
 
     // Initialize ewmh atoms
     if ((m_ewmh = ewmh_util::initialize()) == nullptr) {
@@ -329,8 +330,8 @@ namespace modules {
     }
 
     if (m_scroll) {
-      m_builder->action(mousebtn::SCROLL_DOWN, *this, EVENT_PREV, "");
-      m_builder->action(mousebtn::SCROLL_UP, *this, EVENT_NEXT, "");
+      m_builder->action(mousebtn::SCROLL_DOWN, *this, m_revscroll ? EVENT_NEXT : EVENT_PREV, "");
+      m_builder->action(mousebtn::SCROLL_UP, *this, m_revscroll ? EVENT_PREV : EVENT_NEXT, "");
     }
 
     m_builder->append(output);