From ab00f501f1363802282986ea9ab86d2e305bc24d Mon Sep 17 00:00:00 2001
From: Enrico Turri <enricoturri@seznam.cz>
Date: Mon, 25 Nov 2019 10:34:42 +0100
Subject: [PATCH] #3230 - Detection of 3Dconnexion devices every 2 seconds

---
 src/slic3r/GUI/Mouse3DController.cpp | 10 ++++++++++
 src/slic3r/GUI/Mouse3DController.hpp |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/src/slic3r/GUI/Mouse3DController.cpp b/src/slic3r/GUI/Mouse3DController.cpp
index 44bc0fd34..39542e652 100644
--- a/src/slic3r/GUI/Mouse3DController.cpp
+++ b/src/slic3r/GUI/Mouse3DController.cpp
@@ -186,6 +186,7 @@ Mouse3DController::Mouse3DController()
     , m_running(false)
     , m_settings_dialog(false)
 {
+    m_last_time = std::chrono::high_resolution_clock::now();
 }
 
 void Mouse3DController::init()
@@ -332,9 +333,18 @@ void Mouse3DController::render_settings_dialog(unsigned int canvas_width, unsign
 
 bool Mouse3DController::connect_device()
 {
+    static const long long DETECTION_TIME = 2; // seconds
+
     if (is_device_connected())
         return false;
 
+    // check time since last detection took place
+    auto now = std::chrono::high_resolution_clock::now();
+    if (std::chrono::duration_cast<std::chrono::seconds>(now - m_last_time).count() < DETECTION_TIME)
+        return false;
+
+    m_last_time = now;
+
     // Enumerates devices
     hid_device_info* devices = hid_enumerate(0, 0);
     if (devices == nullptr)
diff --git a/src/slic3r/GUI/Mouse3DController.hpp b/src/slic3r/GUI/Mouse3DController.hpp
index 161274b5a..40c489853 100644
--- a/src/slic3r/GUI/Mouse3DController.hpp
+++ b/src/slic3r/GUI/Mouse3DController.hpp
@@ -12,6 +12,7 @@
 #include <thread>
 #include <mutex>
 #include <vector>
+#include <chrono>
 
 namespace Slic3r {
 namespace GUI {
@@ -130,6 +131,7 @@ class Mouse3DController
     std::string m_device_str;
     bool m_running;
     bool m_settings_dialog;
+    std::chrono::time_point<std::chrono::steady_clock> m_last_time;
 
 public:
     Mouse3DController();