using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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/// <summary>
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/// Class which component which an LogicElementUI can be dragged into should derive from
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/// </summary>
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public abstract class LogicElementHolder : MonoBehaviour
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{
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/// <summary>
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/// List of all Holders in scene
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/// </summary>
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private static List<LogicElementHolder> EnabledHolders = new List<LogicElementHolder>();
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#region Unity Functions
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private void OnEnable()
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{
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EnabledHolders.Add(this);
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}
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private void OnDisable()
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{
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EnabledHolders.Remove(this);
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}
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#endregion
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#region Class Funtions
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/// <summary>
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/// When a LogicElement has started being dragged from this holder
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/// </summary>
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/// <param name="element">Element which is being dragged</param>
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public abstract void OnRemove(LogicElementUI element);
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/// <summary>
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/// When a logicElement needs to be added back to this holder
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/// </summary>
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/// <param name="element">Element which is being Added</param>
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public abstract void OnAdd(LogicElementUI element);
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/// <summary>
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/// When a logic Element is hovering over this holder
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/// </summary>
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/// <param name="element">Element which is hovering</param>
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public virtual void OnHover(LogicElementUI element) { }
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/// <summary>
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/// First frame a logic Element is hovering over this holder
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/// </summary>
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/// <param name="element">Element which is hovering</param>
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public virtual void OnHoverStart(LogicElementUI element) { }
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/// <summary>
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/// first frame a logic Element is no longer hovering over this holder
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/// </summary>
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/// <param name="element">Element which is hovering</param>
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public virtual void OnHoverEnd(LogicElementUI element) { }
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#endregion Class Funtions
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#region Static Functions
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/// <summary>
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/// Gets an array of Any element holders a RectTransform is overlapping with
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/// </summary>
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/// <param name="rt">recttransform to check overlapping</param>
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/// <returns>array of Any element holders a rt is overlapping with</returns>
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public static LogicElementHolder[] OverlappingElements(RectTransform rt)
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{
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List<LogicElementHolder> retVal = new List<LogicElementHolder>();
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Rect rect = rt.GlobalRect();
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Rect holderRect;
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foreach (LogicElementHolder holder in EnabledHolders)
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{
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holderRect = (holder.transform as RectTransform).GlobalRect();
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if (rect.Overlaps(holderRect))
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retVal.Add(holder);
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}
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return retVal.ToArray();
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}
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#endregion
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}
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