WIP: Undo/Redo

McBitFont/CanvasHistory.cs

@@ -0,0 +1,74 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+
+
+namespace McBitFont {
+    internal class CanvasHistory {
+        private List<bool[,]> stack;
+        public int Depth { get; set; }
+        public int Index { get; set; }
+        public int Count {
+            get { return stack.Count; }
+        }
+        public int Redos {
+            get {
+                return Count - Index - 1;
+            }
+        }
+        public int Undos {
+            get {
+                return Index + 1;
+            }
+        }
+
+        
+        public CanvasHistory(int depth = 5, int index = -1) {
+            Depth = depth;
+            Index = index;
+            stack = [];
+        }
+
+        public void Clear() {
+            stack.Clear();
+            Index = -1;
+        }
+
+        public void Add(bool[,] data, bool useIndex = true) {
+            if (Index < Count - 1) {
+                stack.RemoveRange(Index + 1, Count - Index - 1);
+            }
+            stack.Add(data);
+            if (useIndex) {
+                if (Count > Depth) stack.RemoveAt(0);
+                else Index++;
+            }
+        }
+
+        public void ApplyAdded() {
+            if (Count > Depth)
+                while (Count > Depth) stack.RemoveAt(0);
+            else Index = Count - 1;
+        }
+
+        public void Remove(bool useIndex = true) {
+            stack.RemoveAt(stack.Count - 1);
+            if (useIndex) Index--;
+        }
+
+        public void Undo(ref bool[,] data) {
+            if (Index < 0) return;
+            data = stack.ElementAt(Index);
+            Index--;
+        }
+
+        public void Redo(ref bool[,] data) {
+            if (Index >= Count - 1) return;
+            Index++;
+            data = stack.ElementAt(Index);
+        }
+    }
+}