From 0d986b8dc26073b3c2ddb12e30c7886ff4e3e4ba Mon Sep 17 00:00:00 2001
From: David Rowe <david@ctrlaltstudio.com>
Date: Sat, 17 Jun 2017 14:43:32 +1200
Subject: [PATCH] Signal when Leap Motion is connected

---
 plugins/hifiLeapMotion/src/LeapMotionPlugin.cpp | 14 ++++++++++++++
 plugins/hifiLeapMotion/src/LeapMotionPlugin.h   |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/plugins/hifiLeapMotion/src/LeapMotionPlugin.cpp b/plugins/hifiLeapMotion/src/LeapMotionPlugin.cpp
index 34913cb415..b60c2f69cf 100644
--- a/plugins/hifiLeapMotion/src/LeapMotionPlugin.cpp
+++ b/plugins/hifiLeapMotion/src/LeapMotionPlugin.cpp
@@ -32,7 +32,21 @@ void LeapMotionPlugin::pluginUpdate(float deltaTime, const controller::InputCali
         return;
     }
 
+    const auto frame = _controller.frame();
+    const auto frameID = frame.id();
+    if (_lastFrameID >= frameID) {
+        // Leap Motion not connected or duplicate frame.
+        return;
+    }
+
+    if (!_hasLeapMotionBeenConnected) {
+        emit deviceConnected(getName());
+        _hasLeapMotionBeenConnected = true;
+    }
+
     // TODO
+
+    _lastFrameID = frameID;
 }
 
 controller::Input::NamedVector LeapMotionPlugin::InputDevice::getAvailableInputs() const {
diff --git a/plugins/hifiLeapMotion/src/LeapMotionPlugin.h b/plugins/hifiLeapMotion/src/LeapMotionPlugin.h
index 7db4f4d8d7..ed5a3c94fe 100644
--- a/plugins/hifiLeapMotion/src/LeapMotionPlugin.h
+++ b/plugins/hifiLeapMotion/src/LeapMotionPlugin.h
@@ -63,6 +63,8 @@ private:
 
     Leap::Controller _controller;
 
+    bool _hasLeapMotionBeenConnected { false };
+    int64_t _lastFrameID { -1 };
 };
 
 #endif // hifi_LeapMotionPlugin_h