From b2f0cb564a296653c83b0a64c0f9a3de0a2f0d5e Mon Sep 17 00:00:00 2001
From: Roland Reichwein <mail@reichwein.it>
Date: Mon, 6 Jan 2025 00:15:32 +0100
Subject: Implement touchpad

---
 Makefile       |  5 ++++-
 UI.cpp         | 21 ++++++++++++++++++---
 UI.h           |  4 ++++
 debian/control |  2 +-
 4 files changed, 27 insertions(+), 5 deletions(-)

diff --git a/Makefile b/Makefile
index 8580c77..f48b8b2 100644
--- a/Makefile
+++ b/Makefile
@@ -17,12 +17,12 @@ SRCS= \
   ClockClick.cpp \
   InternalClick.cpp \
   BPMDetect.cpp \
+  Touchpad.cpp
 
 HEADERS=$(SRCS:.cpp=.h)
 
 OBJS=$(SRCS:.cpp=.o)
 
-CXXLIBS=$(shell pkg-config --libs alsa) -lreichwein -lfmt -lasound
 CXX=clang++
 
 ifeq ($(CXXFLAGS),)
@@ -32,6 +32,9 @@ endif
 CXXFLAGS+=-std=c++20 -Wall -Wpedantic
 # workaround for Debian dh_dwz:
 CXXFLAGS+=-gdwarf-4
+CXXFLAGS+=-I/usr/include/libevdev-1.0
+
+CXXLIBS=$(shell pkg-config --libs alsa) -lreichwein -lfmt -lasound -levdev
 
 $(TARGET): $(OBJS)
 	$(CXX) $^ -o $@ $(CXXLIBS)
diff --git a/UI.cpp b/UI.cpp
index 5d304b0..2dab410 100644
--- a/UI.cpp
+++ b/UI.cpp
@@ -61,16 +61,16 @@ UI::UI(Config& config):
   m_active_sensing_timestamp{},
   m_midi_timestamp{},
   m_note_bpm{},
-  m_clock_bpm{}
+  m_clock_bpm{},
+  m_touchpad{}
 {
 }
 
 bool UI::key_available() {
   struct pollfd fds{};
-  int ret;
   fds.fd = 0; // stdin
   fds.events = POLLIN;
-  ret = poll(&fds, 1, 0);
+  int ret = poll(&fds, 1, 0);
   if (ret == 0)
     return false;
   else if (ret == 1)
@@ -179,6 +179,7 @@ void UI::draw()
 
 void UI::handle_input()
 {
+  // handle console key
   if (key_available()) {
     char c;
     std::cin >> c;
@@ -206,6 +207,20 @@ void UI::handle_input()
       log_cout << fmt::format("Unknown key: {}", c) << std::endl;
     }
   }
+
+  // handle touchpad
+  if (m_touchpad.is_valid() && m_touchpad.event_available()) {
+    input_event ev = m_touchpad.get_event();
+
+    if (m_touchpad.event_is_button1(ev)) {
+      m_config.set_mode((m_config.get_mode() + 1) % 3);
+    } else if (m_touchpad.event_is_button2(ev)) {
+      if (!m_midi_monitor.empty()) {
+        m_config.set_midi_channel(m_midi_monitor.front().first);
+        m_config.set_midi_note(m_midi_monitor.front().second);
+      }
+    }
+  }
 }
 
 void UI::count_main_loops()
diff --git a/UI.h b/UI.h
index e8b1031..b1dd7dd 100644
--- a/UI.h
+++ b/UI.h
@@ -8,6 +8,8 @@
 
 #include <boost/signals2.hpp>
 
+#include "Touchpad.h"
+
 using clock_type = std::chrono::high_resolution_clock;
 
 struct IntervalCounter
@@ -62,5 +64,7 @@ private:
 
   int m_note_bpm;
   int m_clock_bpm;
+
+  Touchpad m_touchpad;
 };
 
diff --git a/debian/control b/debian/control
index dd6e5f8..32b713a 100644
--- a/debian/control
+++ b/debian/control
@@ -2,7 +2,7 @@ Source: click
 Section: sound
 Priority: optional
 Maintainer: Roland Reichwein <mail@reichwein.it>
-Build-Depends: debhelper, clang, libc++-dev, libreichwein-dev, libasound2-dev, libfmt-dev, libboost-all-dev
+Build-Depends: debhelper, clang, libc++-dev, libreichwein-dev, libasound2-dev, libfmt-dev, libboost-all-dev, libevdev-dev
 Standards-Version: 4.5.0
 Homepage: http://www.reichwein.it/click/
 
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