Feature/interaction monitor (#999)

* interaction monitor first commit

* Renaming some member variables with underscore

* Interaction monitor registering mouse events and touch events

* Added setIdleTime

* Adding to CMakeLists

* Moved interactionmoitor.cpp to correct locatioN

* Cleanup after review. Removed interaction type string and fixed indentation

* Changed documentation description

* Renamed hasNewWebInput to processNewWebInput

* Some cleanup

* Rename registerInteraction to markInteraction
Add markInteraction calls to mouse and keyboard event sin OpenSpaceEngine

include/openspace/interaction/interactionmonitor.h

@@ -0,0 +1,70 @@
+/*****************************************************************************************
+ *                                                                                       *
+ * OpenSpace                                                                             *
+ *                                                                                       *
+ * Copyright (c) 2014-2019                                                               *
+ *                                                                                       *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this  *
+ * software and associated documentation files (the "Software"), to deal in the Software *
+ * without restriction, including without limitation the rights to use, copy, modify,    *
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to    *
+ * permit persons to whom the Software is furnished to do so, subject to the following   *
+ * conditions:                                                                           *
+ *                                                                                       *
+ * The above copyright notice and this permission notice shall be included in all copies *
+ * or substantial portions of the Software.                                              *
+ *                                                                                       *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,   *
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A         *
+ * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT    *
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF  *
+ * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE  *
+ * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                                         *
+ ****************************************************************************************/
+
+#ifndef __OPENSPACE_CORE___INTERACTIONMONITOR___H__
+#define __OPENSPACE_CORE___INTERACTIONMONITOR___H__
+
+#include <openspace/properties/propertyowner.h>
+
+#include <openspace/properties/scalar/boolproperty.h>
+#include <openspace/properties/scalar/floatproperty.h>
+
+namespace openspace::interaction {
+
+/**
+ * The class InteractionMonitor keeps track of user interactions during an OpenSpace
+ * session. It keeps track of when the latest interaction was made and of when the state
+ * changes to idle.
+ */
+class InteractionMonitor : public properties::PropertyOwner {
+public:
+    InteractionMonitor();
+
+    void setActivityState(bool isActive);
+    void setIdleTime(float time);
+
+    /*
+     * Called every frame from OpenSpaceEngine and calculates the activity state depending
+     * on the last registered interaction.
+     */
+    void updateActivityState();
+
+    /*
+     * Called from all places we want to mark activity from. Updates the last registered
+     * interaction time
+     */
+    void markInteraction();
+
+private:
+    double _lastInteractionTime = 0;
+    properties::BoolProperty _isInActiveState;
+    properties::FloatProperty _idleTime; // in seconds
+
+    // @TODO (lovisa) make a list of interactions to listen for
+    // and only allow registering updates from those interactions
+};
+
+} // namespace openspace::interaction
+
+#endif // __OPENSPACE_CORE___INTERACTIONMONITOR___H__