-
Notifications
You must be signed in to change notification settings - Fork 0
/
Command.cs
76 lines (67 loc) · 1.87 KB
/
Command.cs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
// Copyright 2018 John Pursey
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace MapCombiner
{
interface ICommand
{
void Redo();
void Undo();
}
class Commands
{
public Commands()
{
m_index = 0;
m_commands = new List<ICommand>();
}
public bool CanUndo { get { return m_index > 0; } }
public bool CanRedo { get { return m_index < m_commands.Count; } }
public void Do(ICommand command)
{
if (m_index < m_commands.Count)
m_commands.RemoveRange(m_index, m_commands.Count - m_index);
command.Redo();
m_commands.Add(command);
m_index = m_commands.Count;
}
public void Undo()
{
if (CanUndo)
{
m_index -= 1;
m_commands[m_index].Undo();
}
}
public void Redo()
{
if (CanRedo)
{
m_commands[m_index].Redo();
m_index += 1;
}
}
public void Reset()
{
m_commands.Clear();
m_index = 0;
}
private int m_index;
private List<ICommand> m_commands;
}
}