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Assets/Packages/com.unity.uiextensions/Runtime/Scripts/Controls/SelectionBox/ExampleSelectable.cs

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+/// Original Credit Korindian
+/// Sourced from - http://forum.unity3d.com/threads/rts-style-drag-selection-box.265739/
+/// Updated Credit BenZed
+/// Sourced from - http://forum.unity3d.com/threads/color-picker.267043/
+
+namespace UnityEngine.UI.Extensions
+{
+    public class ExampleSelectable : MonoBehaviour, IBoxSelectable
+    {
+        #region Implemented members of IBoxSelectable
+        bool _selected = false;
+        public bool selected
+        {
+            get
+            {
+                return _selected;
+            }
+
+            set
+            {
+                _selected = value;
+            }
+        }
+
+        bool _preSelected = false;
+        public bool preSelected
+        {
+            get
+            {
+                return _preSelected;
+            }
+
+            set
+            {
+                _preSelected = value;
+            }
+        }
+        #endregion
+
+        //We want the test object to be either a UI element, a 2D element or a 3D element, so we'll get the appropriate components
+        SpriteRenderer spriteRenderer;
+        Image image;
+#if UNITY_2022_1_OR_NEWER
+        TMPro.TMP_Text text;
+#else
+        Text text;
+#endif
+
+        void Start()
+        {
+            spriteRenderer = transform.GetComponent<SpriteRenderer>();
+            image = transform.GetComponent<Image>();
+#if UNITY_2022_1_OR_NEWER
+            text = transform.GetComponent<TMPro.TMP_Text>();
+#else
+            text = transform.GetComponent<Text>();
+#endif
+        }
+
+        void Update()
+        {
+
+            //What the game object does with the knowledge that it is selected is entirely up to it.
+            //In this case we're just going to change the color.
+
+            //White if deselected.
+            Color color = Color.white;
+
+            if (preSelected)
+            {
+                //Yellow if preselected
+                color = Color.yellow;
+            }
+            if (selected)
+            {
+                //And green if selected.
+                color = Color.green;
+            }
+
+            //Set the color depending on what the game object has.
+            if (spriteRenderer)
+            {
+                spriteRenderer.color = color;
+            }
+            else if (text)
+            {
+                text.color = color;
+            }
+            else if (image)
+            {
+                image.color = color;
+            }
+            else if (GetComponent<UnityEngine.Renderer>())
+            {
+                GetComponent<UnityEngine.Renderer>().material.color = color;
+            }
+        }
+    }
+}