Trigger event when stat boost changes.

Signed-off-by: Deukhoofd <Deukhoofd@gmail.com>

src/Battling/EventHooks/Events/ChangeStatEvent.hpp

@@ -0,0 +1,26 @@
+#ifndef CHANGESTATEVENT_HPP
+#define CHANGESTATEVENT_HPP
+
+#include "EventData.hpp"
+
+namespace CreatureLib::Battling {
+    class ChangeStatBoostEvent final : public EventData {
+        const ArbUt::BorrowedPtr<Creature> _creature;
+        const CreatureLib::Library::Statistic _statistic;
+        const int8_t _oldValue;
+        const int8_t _newValue;
+
+    public:
+        ChangeStatBoostEvent(const ArbUt::BorrowedPtr<Creature>& creature, CreatureLib::Library::Statistic statistic,
+                             int8_t oldValue, int8_t newValue) noexcept
+            : _creature(creature), _statistic(statistic), _oldValue(oldValue), _newValue(newValue) {}
+
+        EventDataKind GetKind() const noexcept override { return EventDataKind ::ChangeStatBoost; }
+        const ArbUt::BorrowedPtr<Creature>& GetCreature() const noexcept { return _creature; }
+        CreatureLib::Library::Statistic GetStatistic() const noexcept { return _statistic; }
+        int8_t GetOldValue() const noexcept { return _oldValue; }
+        int8_t GetNewValue() const noexcept { return _newValue; }
+    };
+}
+
+#endif // CHANGESTATEVENT_HPP