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using System.Collections.Generic;
using UnityEngine;
/// <summary>
/// Class which component which an LogicElementUI can be dragged into should derive from
/// </summary>
public abstract class LogicElementHolder : MonoBehaviour
{
/// <summary>
/// List of all Holders in scene
/// </summary>
private static List<LogicElementHolder> EnabledHolders = new List<LogicElementHolder>();
[Tooltip("An Element with a higher priority will be used if two object overlap")]
public int Priority = 0;
#region Unity Functions
protected virtual void OnEnable()
{
EnabledHolders.Add(this);
}
protected virtual void OnDisable()
{
EnabledHolders.Remove(this);
}
#endregion
#region Class Funtions
/// <summary>
/// When a LogicElement has started being dragged from this holder
/// </summary>
/// <param name="element">Element which is being dragged</param>
public abstract void OnRemove(LogicElementUI element);
/// <summary>
/// When a logicElement needs to be added back to this holder
/// </summary>
/// <param name="element">Element which is being Added</param>
public abstract void OnAdd(LogicElementUI element);
/// <summary>
/// When a logic Element is hovering over this holder
/// </summary>
/// <param name="element">Element which is hovering</param>
public virtual void OnHover(LogicElementUI element) { }
/// <summary>
/// First frame a logic Element is hovering over this holder
/// </summary>
/// <param name="element">Element which is hovering</param>
public virtual void OnHoverStart(LogicElementUI element) { }
/// <summary>
/// first frame a logic Element is no longer hovering over this holder
/// </summary>
/// <param name="element">Element which is hovering</param>
public virtual void OnHoverEnd(LogicElementUI element) { }
/// <summary>
/// Called when an element in this holder is double clicked
/// </summary>
/// <param name="element">element which was double clicked</param>
public abstract void OnDoubleClick(LogicElementUI element);
/// <summary>
/// Called to check if this holder can hold the provided element;
/// </summary>
/// <param name="element">element to check if it can hold</param>
/// <returns>returns true if this can hold the element </returns>
public virtual bool canHold(LogicBlock element) { return true; }
#endregion Class Funtions
#region Static Functions
/// <summary>
/// Gets an array of Any element holders a RectTransform is overlapping with
/// </summary>
/// <param name="rt">recttransform to check overlapping</param>
/// <returns>array of Any element holders a rt is overlapping with</returns>
public static LogicElementHolder[] OverlappingElements(RectTransform rt)
{
List<LogicElementHolder> retVal = new List<LogicElementHolder>();
Rect rect = rt.GlobalRect();
Rect holderRect;
foreach (LogicElementHolder holder in EnabledHolders)
{
holderRect = (holder.transform as RectTransform).GlobalRect();
if (rect.Overlaps(holderRect))
retVal.Add(holder);
}
return retVal.ToArray();
}
public static void DebugDrawAll(Color color, float duration = 0.0f, bool depthTest = false)
{
EnabledHolders.ForEach(p => DebugExtensions.DrawRect(p.transform as RectTransform, color,duration, depthTest));
}
#endregion
}