66 lines
1.9 KiB
C#
66 lines
1.9 KiB
C#
using System;
|
|
using System.Collections.Generic;
|
|
using System.Linq;
|
|
using System.Text;
|
|
|
|
namespace Io.Github.Kerwinxu.LibShapes.Core.Command
|
|
{
|
|
public class CommandRecorder:ICommandRecorder
|
|
{
|
|
// 保存一堆的命令
|
|
private List<ICommand> commands = new List<ICommand>();
|
|
// 当前的下标
|
|
private int current_index = -1;
|
|
|
|
public void addCommand(ICommand command)
|
|
{
|
|
// 这里要判断是否是最后一个
|
|
if (current_index < commands.Count - 1)
|
|
{
|
|
// 说明后边还有，首先删除后边的
|
|
commands.RemoveRange(current_index + 1, commands.Count - current_index-1);
|
|
}
|
|
// 添加进去
|
|
commands.Add(command);
|
|
// 重新设置
|
|
current_index += 1;
|
|
}
|
|
|
|
public bool isRedoAble()
|
|
{
|
|
return current_index < this.commands.Count - 1;
|
|
//throw new NotImplementedException();
|
|
}
|
|
|
|
public bool isUndoAble()
|
|
{
|
|
return current_index > 0;
|
|
//throw new NotImplementedException();
|
|
}
|
|
|
|
public void Redo()
|
|
{
|
|
//
|
|
current_index += 1;// 往后退一步
|
|
if (current_index >= commands.Count) current_index = commands.Count - 1;// 不能再前进了。
|
|
// 这里表示有操作
|
|
if (current_index >= 0 && current_index < commands.Count)
|
|
{
|
|
commands[current_index].Redo();
|
|
}
|
|
|
|
}
|
|
|
|
public void Undo()
|
|
{
|
|
// 这里表示有操作
|
|
if (current_index >= 0 && current_index < commands.Count)
|
|
{
|
|
commands[current_index].Undo();
|
|
}
|
|
current_index -= 1;// 往后退一步
|
|
if (current_index < 0) current_index = -1;// 有最小的不能再退
|
|
}
|
|
}
|
|
}
|
