Painter/Component/UndoRedo.cs

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using System;
using System.Linq;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Ink;

namespace Component
{
    public abstract class CommandItem
    {
        public abstract void Undo();
        public abstract void Redo();
        protected CommandStack _commandStack;
        protected CommandItem(CommandStack commandStack)
        {
            _commandStack = commandStack;
        }
    }
    public class CommandStack
    {
        public delegate void EnableUI();
        public event EnableUI EnableEvent;

        //避免删除stroke事件影响
        bool _undo_redo_flag = false;
        private Stack<CommandItem> _undoStack;
        private Stack<CommandItem> _redoStack;
        public List<StrokeCollection> StrokeCollection { get; set; }
        public CommandStack(List<StrokeCollection> strokes)
        {
            StrokeCollection = strokes;
            _undoStack = new Stack<CommandItem>();
            _redoStack = new Stack<CommandItem>();
        }
        public int Undo_Count() { return _undoStack.Count; }
        public int Redo_Count() { return _redoStack.Count; }

        public void Undo()
        {
            if (_undoStack.Count == 0) return;
            _undo_redo_flag = true;
            CommandItem item = _undoStack.Pop();
            item.Undo();
            _redoStack.Push(item);
            _undo_redo_flag = false;

            EnableEvent?.Invoke();
        }
        public void Redo()
        {
            if (_redoStack.Count == 0) return;
            _undo_redo_flag = true;
            CommandItem item = _redoStack.Pop();
            item.Redo();
            _undoStack.Push(item);
            _undo_redo_flag = false;

            EnableEvent?.Invoke();