Optimize code structure for input module.

Assets/Cryville/Common/Unity/Input/SimpleInputConsumer.cs

@@ -0,0 +1,49 @@
+using System;
+using System.Collections.Generic;
+
+namespace Cryville.Common.Unity.Input {
+	public class SimpleInputConsumer {
+		readonly InputManager _manager;
+		readonly object _lock = new object();
+		readonly Dictionary<InputIdentifier, InputVector> _vectors = new Dictionary<InputIdentifier, InputVector>();
+		readonly List<InputEvent> _events = new List<InputEvent>();
+		public SimpleInputConsumer(InputManager manager) { _manager = manager; }
+		public void Activate() {
+			lock (_lock) {
+				_events.Clear();
+			}
+			_manager.EnumerateHandlers(h => h.OnInput += OnInput);
+		}
+		public void Deactivate() {
+			_manager.EnumerateHandlers(h => h.OnInput -= OnInput);
+		}
+		protected void OnInput(InputIdentifier id, InputVector vec) {
+			lock (_lock) {
+				InputVector vec0;
+				if (_vectors.TryGetValue(id, out vec0)) {
+					_events.Add(new InputEvent {
+						Id = id,
+						From = vec0,
+						To = vec,
+					});
+					if (vec.IsNull) _vectors.Remove(id);
+					else _vectors[id] = vec;
+				}
+				else {
+					_events.Add(new InputEvent {
+						Id = id,
+						From = new InputVector(vec.Time),
+						To = vec,
+					});
+					_vectors.Add(id, vec);
+				}
+			}
+		}
+		public void EnumerateEvents(Action<InputEvent> cb) {
+			lock (_lock) {
+				foreach (var ev in _events) cb(ev);
+				_events.Clear();
+			}
+		}
+	}
+}