First commit

Packages/ayellowpaper.serialized-dictionary/Editor/Scripts/States/ListState.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine;
+using static AYellowpaper.SerializedCollections.Editor.SerializedDictionaryDrawer;
+
+namespace AYellowpaper.SerializedCollections.Editor.States
+{
+    internal abstract class ListState
+    {
+        public abstract int ListSize { get; }
+        public virtual string NoElementsText => "List is Empty.";
+
+        public readonly SerializedDictionaryInstanceDrawer Drawer;
+
+        public ListState(SerializedDictionaryInstanceDrawer serializedDictionaryDrawer)
+        {
+            Drawer = serializedDictionaryDrawer;
+        }
+
+        public abstract SerializedProperty GetPropertyAtIndex(int index);
+        public abstract ListState OnUpdate();
+        public abstract void OnEnter();
+        public abstract void OnExit();
+        public abstract void DrawElement(Rect rect, SerializedProperty property, DisplayType displayType);
+        public abstract void RemoveElementAt(int index);
+        public abstract void InserElementAt(int index);
+
+        public virtual float GetHeightAtIndex(int index, bool drawKeyAsList, bool drawValueAsList)
+        {
+            return SerializedDictionaryInstanceDrawer.CalculateHeightOfElement(GetPropertyAtIndex(index), drawKeyAsList, drawValueAsList);
+        }
+    }
+}