working delete feature + placeholder refactor

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       propertyPath: _food
@@ -3002,11 +3004,11 @@ PrefabInstance:
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@@ -3030,15 +3032,15 @@ PrefabInstance:
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       propertyPath: m_AnchoredPosition.x
@@ -3062,7 +3064,7 @@ PrefabInstance:
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@@ -3110,15 +3112,15 @@ PrefabInstance:
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@@ -3126,15 +3128,15 @@ PrefabInstance:
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@@ -3174,7 +3176,7 @@ PrefabInstance:
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     m_RemovedComponents: []
   m_SourcePrefab: {fileID: 100100000, guid: 306211cf6348ac747a78d89bd72fca3e, type: 3}

Assets/Scripts/DeleteButton.cs

@@ -1,12 +0,0 @@
-using System.Collections;
-using System.Collections.Generic;
-using UnityEngine;
-using UnityEngine.EventSystems;
-
-public class DeleteButton : PlacementButton
-{
-    protected override DraggablePlaceholder Place()
-    {
-        throw new System.NotImplementedException();
-    }
-}

Assets/Scripts/Drag&Drop/DeleteButton.cs

@@ -0,0 +1,37 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.EventSystems;
+
+public class DeleteButton : PlacementButton
+{
+    [SerializeField]
+    private GameObject _prefab;
+    protected override DraggablePlaceholder Place()
+    {
+        var instance = Instantiate(_prefab);
+
+        //strip the object
+        foreach (var r_body in instance.transform.GetAllComponents<Rigidbody2D>())
+            Destroy(r_body);
+        foreach (var coll in instance.transform.GetAllComponents<Collider2D>())
+            Destroy(coll);
+        foreach (var script in instance.transform.GetAllComponents<MonoBehaviour>())
+            Destroy(script);
+
+        var placeholder = instance.AddComponent<DeleteShovel>();
+
+        //assign outline material to all renderers of the placeholder
+        foreach (var rend in instance.transform.GetAllComponents<SpriteRenderer>())
+        {
+            var color = rend.color;
+            color.a = 0.6f;
+            rend.color = color;
+
+            rend.material = OutlineMaterial;
+            placeholder.OutlineRenderers.Add(rend);
+        }
+
+        return placeholder;
+    }
+}

Assets/Scripts/Drag&Drop/DeleteShovel.cs

@@ -0,0 +1,17 @@
+using Codice.CM.Client.Differences;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class DeleteShovel : DraggablePlaceholder
+{
+    public override void Place()
+    {
+        var hit = LevelManager.Instance.Get<Ally>(x => x.Position.IsContainedIn(transform.position));
+        if (hit) Destroy(hit.gameObject);
+    }
+    public override bool CanBePlacedHere()
+    {
+        return LevelBoundCache.Contains(transform.position) && LevelManager.Instance.Has<Ally>(x => x.Position.IsContainedIn(transform.position));
+    }
+}

Assets/Scripts/Drag&Drop/DeleteShovel.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 764223f248039ad4f91de22f479da2e5
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Scripts/Drag&Drop/DraggablePlaceholder.cs

@@ -5,22 +5,24 @@ using UnityEngine;
 
 public abstract class DraggablePlaceholder : MonoBehaviour
 {
-    public int Food { get; set; }
-    public int Rock { get; set; }
-    public int Wood { get; set; }
-
     protected const string OutlineColor = "_OutlineColor";
 
     [SerializeField]
-    protected Color _validColor = Color.green;
+    private Color _validColor = Color.green;
     [SerializeField]
-    protected Color _invalidColor = Color.red;
+    private Color _invalidColor = Color.red;
-
-    protected Camera _mainCamCache;
-    protected Rect _lvlBoundsCache;
-    protected bool _canBePlacedHere;
 
+    private Camera _mainCamCache;
+    private Rect _lvlBoundsCache;
+    private bool _canBePlacedHere;
     private List<SpriteRenderer> _outlineRenderers = new List<SpriteRenderer>();
+
+    public Color ValidColor => _validColor;
+    public Color InvalidColor => _invalidColor;
+    public Camera MainCamCache => _mainCamCache;
+    public Rect LevelBoundCache => _lvlBoundsCache;
+    public bool PlaceableHere => _canBePlacedHere;
+
     public List<SpriteRenderer> OutlineRenderers
     {
         get => _outlineRenderers;
@@ -52,7 +54,6 @@ public abstract class DraggablePlaceholder : MonoBehaviour
         {
             if (_canBePlacedHere)
             {
-                ResourceManager.Instance.Remove(Rock, Wood, Food);
                 Place();
             }
             Destroy(gameObject);
@@ -91,9 +92,7 @@ public abstract class DraggablePlaceholder : MonoBehaviour
     /// </summary>
     public virtual bool CanBePlacedHere()
     {
-        return !LevelManager.Instance.Has<ILevelObject>(obj => obj.Position.IsContainedIn(transform.position)) 
+        return _lvlBoundsCache.Contains(transform.position);
-            && _lvlBoundsCache.Contains(transform.position)
-            && ResourceManager.Instance.EnoughFor(Rock, Wood, Food);
     }
 
     /// <summary>

Assets/Scripts/Drag&Drop/ObjectPlaceholder.cs

@@ -1,6 +1,6 @@
 using UnityEngine;
 
-public class ObjectPlaceholder : DraggablePlaceholder
+public class ObjectPlaceholder : UnitPlaceholder
 {
     public GameObject Prefab { get; set; }
     public override void Place()
@@ -14,7 +14,7 @@ public class ObjectPlaceholder : DraggablePlaceholder
 
         var defaultUnitCost = GlobalConfig.Instance.Current.populationCostPerUnit;
         return !positionIsCollidable 
-            && _lvlBoundsCache.Contains(transform.position)
+            && LevelBoundCache.Contains(transform.position)
             && ResourceManager.Instance.EnoughFor(Rock, Wood, Food)
             && (Prefab.GetComponent<Building>()
             || ResourceManager.Instance.EnoughPopulationFor(defaultUnitCost));

Assets/Scripts/Drag&Drop/UnitPlaceholder.cs

@@ -0,0 +1,16 @@
+public abstract class UnitPlaceholder : DraggablePlaceholder
+{
+    public int Food { get; set; }
+    public int Rock { get; set; }
+    public int Wood { get; set; }
+
+    public override void Place()
+    {
+        ResourceManager.Instance.Remove(Rock, Wood, Food);
+    }
+    public override bool CanBePlacedHere()
+    {
+        return base.CanBePlacedHere() && ResourceManager.Instance.EnoughFor(Rock, Wood, Food) 
+            && !LevelManager.Instance.Has<ILevelObject>(obj => obj.Position.IsContainedIn(transform.position));
+    }
+}

Assets/Scripts/Drag&Drop/UnitPlaceholder.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 3ea33adc7f9b27c40940e626a70e26a7
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Scripts/Drag&Drop/UnitPlacementButton.cs

@@ -39,8 +39,8 @@ public abstract class UnitPlacementButton : PlacementButton
     public override void OnPointerDown(PointerEventData eventData)
     {
         base.OnPointerDown(eventData);
-        Placeholder.Rock = _rock;
+        (Placeholder as UnitPlaceholder).Rock = _rock;
-        Placeholder.Wood = _wood;
+        (Placeholder as UnitPlaceholder).Wood = _wood;
-        Placeholder.Food = _food;
+        (Placeholder as UnitPlaceholder).Food = _food;
     }
 }