From 8e5b5258e2c8133f7e61712b828d9390fd5947a2 Mon Sep 17 00:00:00 2001
From: Mihir Lad <mihirlad55@gmail.com>
Date: Sat, 18 Jul 2020 01:46:07 -0400
Subject: [PATCH] Use focused_title_change_event to update titles

This fixes issue mihirlad55/polybar-dwm-module#4 where the title would not
update if the title of the currently focused window changed. The
focused_title_change_event is raised exactly when the focused window's
title changes, so this should automatically update the title using the callback
when necessary.
---
 include/modules/dwm.hpp |  1 +
 src/modules/dwm.cpp     | 13 +++++++++++--
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/include/modules/dwm.hpp b/include/modules/dwm.hpp
index d081d3ec..ff108d26 100644
--- a/include/modules/dwm.hpp
+++ b/include/modules/dwm.hpp
@@ -67,6 +67,7 @@ namespace modules {
     shared_ptr<std::vector<dwmipc::Monitor>> m_monitors;
     unsigned int m_active_mon_num = 0;
     unsigned int m_bar_mon = 0;
+    unsigned int m_focused_client_id = 0;
 
     std::unordered_map<state_t, label_t> m_state_labels;
     vector<tag_t> m_tags;
diff --git a/src/modules/dwm.cpp b/src/modules/dwm.cpp
index ea80bba4..4cdb7652 100644
--- a/src/modules/dwm.cpp
+++ b/src/modules/dwm.cpp
@@ -111,19 +111,28 @@ namespace modules {
           return;
         }
 
+        m_focused_client_id = ev.new_win_id;
         m_title_label->reset_tokens();
-        if (ev.new_win_id != 0) {
-          auto focused_client = m_ipc->get_client(ev.new_win_id);
+        if (m_focused_client_id != 0) {
+          auto focused_client = m_ipc->get_client(m_focused_client_id);
           m_title_label->replace_token("%title%", focused_client->name);
         } else {
           m_title_label->replace_token("%title%", "");
         }
       };
 
+      m_ipc->on_focused_title_change = [this](const dwmipc::FocusedTitleChangeEvent& ev) {
+        if (ev.monitor_num == m_bar_mon && ev.client_window_id == m_focused_client_id) {
+          m_title_label->reset_tokens();
+          m_title_label->replace_token("%title%", ev.new_name);
+        }
+      };
+
       m_ipc->subscribe(dwmipc::Event::LAYOUT_CHANGE);
       m_ipc->subscribe(dwmipc::Event::CLIENT_FOCUS_CHANGE);
       m_ipc->subscribe(dwmipc::Event::TAG_CHANGE);
       m_ipc->subscribe(dwmipc::Event::MONITOR_FOCUS_CHANGE);
+      m_ipc->subscribe(dwmipc::Event::FOCUSED_TITLE_CHANGE);
     } catch (const dwmipc::IPCError& err) {
       throw module_error(err.what());
     }