From c2d142e11249e2c9a5d416cd324df936b4fe0377 Mon Sep 17 00:00:00 2001
From: Takayama Fumihiko <tekezo@pqrs.org>
Date: Sat, 23 Sep 2023 09:56:02 +0900
Subject: [PATCH] Add game_pad_stick_converter

---
 .../include/grabber/device_grabber.hpp        |  7 +++
 .../game_pad_stick_converter.hpp              | 43 +++++++++++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 src/core/grabber/include/grabber/device_grabber_details/game_pad_stick_converter.hpp

diff --git a/src/core/grabber/include/grabber/device_grabber.hpp b/src/core/grabber/include/grabber/device_grabber.hpp
index e8d5e4dd9..0c24d0359 100644
--- a/src/core/grabber/include/grabber/device_grabber.hpp
+++ b/src/core/grabber/include/grabber/device_grabber.hpp
@@ -6,6 +6,7 @@
 #include "constants.hpp"
 #include "device_grabber_details/entry.hpp"
 #include "device_grabber_details/fn_function_keys_manipulator_manager.hpp"
+#include "device_grabber_details/game_pad_stick_converter.hpp"
 #include "device_grabber_details/simple_modifications_manipulator_manager.hpp"
 #include "event_tap_utility.hpp"
 #include "filesystem_utility.hpp"
@@ -51,6 +52,8 @@ class device_grabber final : public pqrs::dispatcher::extra::dispatcher_client {
     notification_message_manager_ = std::make_shared<notification_message_manager>(
         constants::get_notification_message_file_path());
 
+    game_pad_stick_converter_ = std::make_shared<device_grabber_details::game_pad_stick_converter>();
+
     simple_modifications_manipulator_manager_ = std::make_shared<device_grabber_details::simple_modifications_manipulator_manager>();
     complex_modifications_manipulator_manager_ = std::make_shared<manipulator::manipulator_manager>();
     fn_function_keys_manipulator_manager_ = std::make_shared<device_grabber_details::fn_function_keys_manipulator_manager>();
@@ -445,6 +448,8 @@ class device_grabber final : public pqrs::dispatcher::extra::dispatcher_client {
       post_event_to_virtual_devices_manipulator_manager_ = nullptr;
       virtual_hid_device_service_client_ = nullptr;
 
+      game_pad_stick_converter_ = nullptr;
+
       notification_message_manager_ = nullptr;
 
       hat_switch_converter::get_global_hat_switch_converter()->clear();
@@ -1111,6 +1116,8 @@ class device_grabber final : public pqrs::dispatcher::extra::dispatcher_client {
 
   std::shared_ptr<event_queue::queue> merged_input_event_queue_;
 
+  std::shared_ptr<device_grabber_details::game_pad_stick_converter> game_pad_stick_converter_;
+
   std::shared_ptr<device_grabber_details::simple_modifications_manipulator_manager> simple_modifications_manipulator_manager_;
   std::shared_ptr<event_queue::queue> simple_modifications_applied_event_queue_;
 
diff --git a/src/core/grabber/include/grabber/device_grabber_details/game_pad_stick_converter.hpp b/src/core/grabber/include/grabber/device_grabber_details/game_pad_stick_converter.hpp
new file mode 100644
index 000000000..187b93275
--- /dev/null
+++ b/src/core/grabber/include/grabber/device_grabber_details/game_pad_stick_converter.hpp
@@ -0,0 +1,43 @@
+#pragma once
+
+#include "types/device_id.hpp"
+#include <memory>
+#include <unordered_map>
+#include <vector>
+
+namespace krbn {
+namespace grabber {
+namespace device_grabber_details {
+//
+// game_pad_stick_converter takes value_arrived data as input and outputs poinitng motion.
+// This conversion is necessary because it is difficult to use game pad sticks as natural pointing devices due to the following characteristics.
+//
+// - The game pad's stick only sends events when the value changes.
+//   We want the pointer to move while the stick is tilted, even if the value does not change.
+//   So we need to send events periodically with a timer.
+// - The game pad's stick may send events slightly in the opposite direction when it is released and returns to neutral.
+//   This event should be properly ignored.
+// - The game pad's stick may have a value in the neutral state. The deadzone must be properly set and ignored neutral values.
+//
+class game_pad_stick_converter final : public pqrs::dispatcher::extra::dispatcher_client {
+public:
+  game_pad_stick_converter(void)
+      : dispatcher_client(),
+        timer_(*this) {
+  }
+
+  ~game_pad_stick_converter(void) {
+    detach_from_dispatcher([this] {
+      timer_.stop();
+    });
+  }
+
+  void convert(std::shared_ptr<event_queue::queue> event_queue) {
+  }
+
+private:
+  pqrs::dispatcher::extra::timer timer_;
+};
+} // namespace device_grabber_details
+} // namespace grabber
+} // namespace krbn