UndoManager.cs

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using System;
using System.Collections.Generic;
 
public class UndoManager
{
    public class Item
    {
        public List<Task> list = new List<Task>();
 
        public string name
        {
            get
            {
                if (list.Count <= 0)
                {
                    return "none".lang();
                }
                return list[0].Name;
            }
        }
 
        public int Count()
        {
            int num = 0;
            foreach (Task item in list)
            {
                if (!item.isDestroyed)
                {
                    num++;
                }
            }
            return num;
        }
    }
 
    public List<Item> items = new List<Item>();
 
    public Item lastItem => items.LastItem();
 
    public void Validate()
    {
        for (int num = items.Count - 1; num >= 0; num--)
        {
            if (items[num].Count() == 0)
            {
                items.RemoveAt(num);
            }
        }
    }
 
    public void NewItem()
    {
        items.Add(new Item());
        if (items.Count > 10)
        {
            items.RemoveAt(0);
        }
    }
 
    public void Add(Task t)
    {
        lastItem.list.Add(t);
    }
 
    public string GetText()
    {
        string text = "";
        text = "tUndo".lang() + Environment.NewLine;
        if (items.Count == 0)
        {
            return text + "tUndoNone".lang();
        }
        return text + "tUndoNote".lang(lastItem.Count().ToString() ?? "", lastItem.name ?? "");
    }
 
    public void WriteNote(UINote n)
    {
        Validate();
        n.Clear();
        n.Space(10);
        n.AddText("NoteText_topic", "tUndo".lang());
        if (items.Count == 0)
        {
            n.AddText("tUndoNone".lang());
        }
        else
        {
            n.AddText("tUndoNote".lang(lastItem.Count().ToString() ?? "", lastItem.name ?? ""));
        }
        n.Build();
    }
 
    public void Perform()
    {
        Validate();
        if (items.Count == 0)
        {
            SE.Beep();
            return;
        }
        foreach (Task item in lastItem.list)
        {
            item.Destroy();
        }
        items.Remove(lastItem);
        SE.Play("trash");
    }
}