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Assets/CoolapeFrame/3rd/NGUI_Enhance/Scripts/Internal/PropertyBinding.cs

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+//----------------------------------------------
+//            NGUI: Next-Gen UI kit
+// Copyright © 2011-2015 Tasharen Entertainment
+//----------------------------------------------
+
+using UnityEngine;
+
+/// <summary>
+/// Property binding lets you bind two fields or properties so that changing one will update the other.
+/// </summary>
+
+[ExecuteInEditMode]
+[AddComponentMenu("NGUI/Internal/Property Binding")]
+public class PropertyBinding : MonoBehaviour
+{
+	public enum UpdateCondition
+	{
+		OnStart,
+		OnUpdate,
+		OnLateUpdate,
+		OnFixedUpdate,
+	}
+
+	public enum Direction
+	{
+		SourceUpdatesTarget,
+		TargetUpdatesSource,
+		BiDirectional,
+	}
+
+	/// <summary>
+	/// First property reference.
+	/// </summary>
+
+	public PropertyReference source;
+
+	/// <summary>
+	/// Second property reference.
+	/// </summary>
+
+	public PropertyReference target;
+
+	/// <summary>
+	/// Direction of updates.
+	/// </summary>
+
+	public Direction direction = Direction.SourceUpdatesTarget;
+
+	/// <summary>
+	/// When the property update will occur.
+	/// </summary>
+
+	public UpdateCondition update = UpdateCondition.OnUpdate;
+
+	/// <summary>
+	/// Whether the values will update while in edit mode.
+	/// </summary>
+
+	public bool editMode = true;
+
+	// Cached value from the last update, used to see which property changes for bi-directional updates.
+	object mLastValue = null;
+
+	void Start ()
+	{
+		UpdateTarget();
+		if (update == UpdateCondition.OnStart) enabled = false;
+	}
+
+	void Update ()
+	{
+#if UNITY_EDITOR
+		if (!editMode && !Application.isPlaying) return;
+#endif
+		if (update == UpdateCondition.OnUpdate) UpdateTarget();
+	}
+
+	void LateUpdate ()
+	{
+#if UNITY_EDITOR
+		if (!editMode && !Application.isPlaying) return;
+#endif
+		if (update == UpdateCondition.OnLateUpdate) UpdateTarget();
+	}
+
+	void FixedUpdate ()
+	{
+#if UNITY_EDITOR
+		if (!editMode && !Application.isPlaying) return;
+#endif
+		if (update == UpdateCondition.OnFixedUpdate) UpdateTarget();
+	}
+
+	void OnValidate ()
+	{
+		if (source != null) source.Reset();
+		if (target != null) target.Reset();
+	}
+
+	/// <summary>
+	/// Immediately update the bound data.
+	/// </summary>
+
+	[ContextMenu("Update Now")]
+	public void UpdateTarget ()
+	{
+		if (source != null && target != null && source.isValid && target.isValid)
+		{
+			if (direction == Direction.SourceUpdatesTarget)
+			{
+				target.Set(source.Get());
+			}
+			else if (direction == Direction.TargetUpdatesSource)
+			{
+				source.Set(target.Get());
+			}
+			else if (source.GetPropertyType() == target.GetPropertyType())
+			{
+				object current = source.Get();
+
+				if (mLastValue == null || !mLastValue.Equals(current))
+				{
+					mLastValue = current;
+					target.Set(current);
+				}
+				else
+				{
+					current = target.Get();
+
+					if (!mLastValue.Equals(current))
+					{
+						mLastValue = current;
+						source.Set(current);
+					}
+				}
+			}
+		}
+	}
+}