[sensorrailtile] Added onStateChanged event

manual/luadoc/object/sensorrailtile.json

@@ -1 +1,13 @@
-{}
+{
+  "on_state_changed": {
+    "parameters": [
+      {
+        "name": "state"
+      },
+      {
+        "name": "sensor"
+      }
+    ],
+    "since": "0.3"
+  }
+}

server/src/board/tile/rail/sensorrailtile.cpp

@@ -58,6 +58,7 @@ SensorRailTile::SensorRailTile(World& world, std::string_view _id) :
           input()->interface->inputSimulateChange(input()->channel, input()->address, SimulateInputAction::Toggle);
         }
       }}
+  , onStateChanged{*this, "on_state_changed", EventFlags::Scriptable}
 {
   const bool editable = contains(m_world.state.value(), WorldState::Edit);
 
@@ -81,6 +82,8 @@ SensorRailTile::SensorRailTile(World& world, std::string_view _id) :
   Attributes::addEnabled(simulateTrigger, false);
   Attributes::addObjectEditor(simulateTrigger, false);
   m_interfaceItems.add(simulateTrigger);
+
+  m_interfaceItems.add(onStateChanged);
 }
 
 //! \todo Remove in v0.4
@@ -125,7 +128,12 @@ void SensorRailTile::worldEvent(WorldState worldState, WorldEvent worldEvent)
 
 void SensorRailTile::inputValueChanged(bool value, const std::shared_ptr<Input>& /*input*/)
 {
-  state.setValueInternal(toSensorState(type, toTriState(value != invert.value())));
+  const auto newState = toSensorState(type, toTriState(value != invert.value()));
+  if(state != newState)
+  {
+    state.setValueInternal(newState);
+    fireEvent(onStateChanged, newState, shared_ptr<SensorRailTile>());
+  }
 }
 
 void SensorRailTile::updateSimulateTriggerEnabled()

server/src/board/tile/rail/sensorrailtile.hpp

@@ -52,6 +52,7 @@ class SensorRailTile : public StraightRailTile, public InputConsumer
     Property<bool> invert;
     Property<SensorState> state;
     Method<void()> simulateTrigger;
+    Event<SensorState, const std::shared_ptr<SensorRailTile>&> onStateChanged;
 
     SensorRailTile(World& world, std::string_view _id);
 };