在调用一些简单的方法实现一系列的动作时,回退的问题比较重要。作为一款用户体验良好的产品而言,有回退功能将显得比较人性化,想想如果我们常用的window,在删除一个文件后无法恢复将变得多么的糟糕。更为直观的例子是在玩一些小游戏时,比如象棋、推箱子,提供了悔棋的功能,用户有了更多选择的余地。
本文主要将的将是在Unity中实现一个以常听说的命令模式为设计原理,实现一个可以撤销移动、旋转、颜色和文字信息的小Demo。
命令模式,主要成员有提出要求的客户、设置命令的收集者、执行命令的接收者。客户要求很简单,点击按扭就要实现一项目具体的效果,设置命令的收集者无需要知道命令如何执行,只需要为执行者做好配制。用命令的执行者将执行一个方法,所有的命令者是继承于有这个方法的接口的类。
抽象到程序代码中,这三类成员分别对应于界面上的用户,RemoteControl (这里是随便命名的),RemoteLoader
先制作如上的界面,方便你比较直观的认识,其中左边两个是用于切换选择不同的命令。下面第一个按扭可以执行选中的命令,第二个按扭可以进行撤销操作。
程序,UGUI面局如下,在Canvas下分别设置了执行者和配制者。
制作好界面之后就可以来实现具体的脚本编辑了,分别创建好接口ICommand,配制脚本RemoteLoader和执行脚本RemoteControl,结构如下:
在Commonds中,分别编写了用于移动,旋转,颜色,文字的脚本
这样一来,就可以实现一个可撤销的命令模式了,效果如下所示:
其中用于保存undo方法和具体怎么undo都是使用Stack来实现的,下面分别是部分代码实现 :
一、接口
public interface ICommand { void Execute(); void UnDo(); }
二、执行器
public class RemoteControl : MonoBehaviour { public Button ctrlBtn; public Button undoBtn; public Text ctrlName; private ICommand icommand; public StackundoFunctions = new Stack (); void Awake(){ ctrlBtn.onClick.AddListener(OnCtrlBtnClicked); undoBtn.onClick.AddListener(OnUnDoBtnClicked); } public void SetText(string textinfo) { ctrlName.text = textinfo; } public void SetCommond(ICommand icommand) { this.icommand = icommand; } /// /// 执行 /// public void OnCtrlBtnClicked() { if (icommand != null) { icommand.Execute(); undoFunctions.Push(icommand.UnDo); } } ////// 撤销 /// private void OnUnDoBtnClicked() { if (undoFunctions.Count > 0) { undoFunctions.Pop().Invoke(); } } }
三、配制加载器
public class RemoteLoader : MonoBehaviour { public Button lastBtn; public Button nextBtn; private int index; private const int NUM_COMMAND = 10; private ICommand[] commands; private string[] textinfos; private MoveCommand movexCmd; private MoveCommand moveyCmd; private MoveCommand movezCmd; private RotateCommand rotxCmd; private RotateCommand rotyCmd; private RotateCommand rotzCmd; private ColorChangeCommand redColorCmd; private ColorChangeCommand greenColorCmd; private ColorChangeCommand blueColorCmd; private TextChangeCommand textCmd; private string[] infos = { "A","B", "C", "D", "E", "F" }; public RemoteControl remoteCtrl; public GameObject cube; void Awake() { lastBtn.onClick.AddListener(OnLastBtnClicked); nextBtn.onClick.AddListener(OnNextBtnClicked); } void Start() { commands = new ICommand[NUM_COMMAND]; textinfos = new string[NUM_COMMAND]; textinfos[0] = "x方向移动"; commands[0] = new MoveCommand(cube.transform, Vector3.right); textinfos[1] = "y方向移动"; commands[1] = new MoveCommand(cube.transform, Vector3.up); textinfos[2] = "z方向移动"; commands[2] = new MoveCommand(cube.transform, Vector3.forward); textinfos[3] = "x轴旋转10度"; commands[3] = new RotateCommand(cube.transform, Vector3.right * 10); textinfos[4] = "y轴旋转10度"; commands[4] = new RotateCommand(cube.transform, Vector3.up * 10); textinfos[5] = "z轴旋转10度"; commands[5] = new RotateCommand(cube.transform, Vector3.forward * 10); textinfos[6] = "变红"; commands[6] = new ColorChangeCommand(Color.red, cube.GetComponent().material); textinfos[7] = "变绿"; commands[7] = new ColorChangeCommand(Color.green, cube.GetComponent ().material); textinfos[8] = "变蓝"; commands[8] = new ColorChangeCommand(Color.blue, cube.GetComponent ().material); textinfos[9] = "换信息"; commands[9] = new TextChangeCommand(cube.GetComponentInChildren (), infos); } private void OnNextBtnClicked() { if (index == NUM_COMMAND || index == -1) { index = 0; } remoteCtrl.SetCommond(commands[index]); remoteCtrl.SetText(textinfos[index]); index++; } private void OnLastBtnClicked() { if (index == NUM_COMMAND || index == -1) { index = NUM_COMMAND - 1; } remoteCtrl.SetCommond(commands[index]); remoteCtrl.SetText(textinfos[index]); index--; } }
四、颜色转换命令脚本
public class ColorChangeCommand : ICommand { private Stackm_OriginColor = new Stack (); private Color m_Color; private Material m_Material; public ColorChangeCommand(Color color, Material material) { m_Color = color; m_Material = material; } public void Execute() { m_OriginColor.Push(m_Material.color); m_Material.color = m_Color; } public void UnDo() { m_Material.color = m_OriginColor.Pop(); } }
五、移动命令脚本
public class MoveCommand : ICommand { private Vector3 m_Offset; private Transform m_Object; public MoveCommand(Transform obj, Vector3 offset) { this.m_Object = obj; this.m_Offset = offset; } public void Execute() { m_Object.transform.position += m_Offset; } public void UnDo() { m_Object.transform.position -= m_Offset; } }
六、转换命令脚本
public class RemoteControl : MonoBehaviour { public Button ctrlBtn; public Button undoBtn; public Text ctrlName; private ICommand icommand; public StackundoFunctions = new Stack (); void Awake(){ ctrlBtn.onClick.AddListener(OnCtrlBtnClicked); undoBtn.onClick.AddListener(OnUnDoBtnClicked); } public void SetText(string textinfo) { ctrlName.text = textinfo; } public void SetCommond(ICommand icommand) { this.icommand = icommand; } /// /// 执行 /// public void OnCtrlBtnClicked() { if (icommand != null) { icommand.Execute(); undoFunctions.Push(icommand.UnDo); } } ////// 撤销 /// private void OnUnDoBtnClicked() { if (undoFunctions.Count > 0) { undoFunctions.Pop().Invoke(); } } }
七、文字加载脚本
public class TextChangeCommand : ICommand { private StacklastInfos = new Stack (); private IEnumerator datas; private TextMesh m_Textmesh; public TextChangeCommand(TextMesh textMesh,ICollection texts) { datas = texts.GetEnumerator(); m_Textmesh = textMesh; } public void Execute() { if (!datas.MoveNext()) { datas.Reset(); datas.MoveNext(); } lastInfos.Push(m_Textmesh.text); m_Textmesh.text = datas.Current; } public void UnDo() { m_Textmesh.text = lastInfos.Pop(); } }
仅供参考,谢谢阅读。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。