学步园

所谓的界面，无非用来显示或者用来编辑数据。

比如说，在软件系统中创建一个用户，那么，必须有个创建用户的Form，一个修改用户信息Form，还有一个单纯的显示用户信息Form。既然以上三种需求是针对同一个数据，那么创建一个Control应该是最合理的方案，尤其是以后维护、增强都很方便。

ACUIBaseControl就是这么一个基类。它的实现支持的情景设定：

创建
修改
只读显示
自定义的情景

所以，创建了一个Enum来表达情景：

public enum ACUIControlMode : byte<br /> {<br /> Creating = 0,<br /> ReadOnlyDisplay = 1,<br /> ChangableDisplay = 2,<br /> Customizing = 3,<br /> Customizing2 = 4,<br /> Customizing3 = 5<br /> }<br />

支持的动作：

Initialize：必须的，在此指定模式
Validate：需要保存时候会对输入的内容进行Validate。
SaveChanges：真正的Save操作
NeedSave：判断时候需要Save，比如Creating模式下，一直需要Save。

完整的代码：

public class ACUIBaseControl : UserControl<br /> {<br /> public ACUIBaseControl() : base() { } </p> <p> #region Fields<br /> protected ACUIControlMode modeControl = ACUIControlMode.Creating;<br /> protected Boolean flagMajorMod = false;<br /> protected Boolean flagInit = false;<br /> #endregion </p> <p> #region Properties<br /> public ACUIControlMode ControlMode<br /> {<br /> get { return modeControl; }<br /> }<br /> public Boolean MajorModifyFlag<br /> {<br /> get { return flagMajorMod; }<br /> }<br /> public Boolean IsInitialized<br /> {<br /> get { return flagInit; }<br /> }<br /> #endregion </p> <p> #region Events<br /> public event EventHandler MajorModifyFlagHandler;<br /> public event ACUIBaseControlSaveModifications SaveModificationsHandler;<br /> #endregion </p> <p> #region Public methods<br /> public Boolean Initialize(ACUIControlMode mode)<br /> {<br /> if (flagInit)<br /> return false; </p> <p> // Set the mode<br /> modeControl = mode;<br /> if (!InitializeAllModes())<br /> return false; </p> <p> // Call it<br /> Boolean bRet = false;<br /> switch (modeControl)<br /> {<br /> case ACUIControlMode.Creating:<br /> bRet = InitializeCreatingMode();<br /> break; </p> <p> case ACUIControlMode.ChangableDisplay:<br /> bRet = InitializeChangableDisplayMode();<br /> break; </p> <p> case ACUIControlMode.Customizing:<br /> bRet = InitializeCustomizingMode();<br /> break; </p> <p> case ACUIControlMode.ReadOnlyDisplay:<br /> bRet = InitializeReadOnlyDisplayMode();<br /> break; </p> <p> case ACUIControlMode.Customizing2:<br /> bRet = InitializeCustomizing2Mode();<br /> break; </p> <p> case ACUIControlMode.Customizing3:<br /> bRet = InitializeCustomizing3Mode();<br /> break; </p> <p> default:<br /> break;<br /> } </p> <p> if (bRet)<br /> {<br /> // Set the flags<br /> flagMajorMod = false;<br /> flagInit = true;<br /> } </p> <p> return bRet;<br /> }<br /> public Boolean SaveChanges()<br /> {<br /> return SaveChanges(null);<br /> }<br /> public Boolean SaveChanges(Object obj)<br /> {<br /> if (!flagInit)<br /> return false;<br /> if (!IsNeedSave())<br /> return true;<br /> if (!ValidateData())<br /> return false; </p> <p> Boolean bRet = TransferData();<br /> switch (modeControl)<br /> {<br /> case ACUIControlMode.Creating:<br /> bRet = SaveCreatingChanges();<br /> break; </p> <p> case ACUIControlMode.ChangableDisplay:<br /> bRet = SaveChangableDisplayChanges();<br /> break; </p> <p> case ACUIControlMode.Customizing:<br /> bRet = SaveCustomizingChanges();<br /> break; </p> <p> case ACUIControlMode.Customizing2:<br /> bRet = SaveCustomizing2Changes();<br /> break; </p> <p> case ACUIControlMode.Customizing3:<br /> bRet = SaveCustomizing3Changes();<br /> break; </p> <p> default:<br /> System.Diagnostics.Debug.WriteLine("Entering some mode which should NEVER occurred!");<br /> break;<br /> } </p> <p> if (bRet &&<br /> (SaveModificationsHandler != null))<br /> {<br /> //Delegate[] dels = SaveModificationsHandler.GetInvocationList();<br /> //foreach (Delegate deg in dels)<br /> //{ }<br /> SaveModificationsHandler(new ACUIBaseControlSaveEventArgs(obj));<br /> } </p> <p> return bRet;<br /> }<br /> public Boolean ValidateData()<br /> {<br /> Boolean bRet = ValidateAllModes();<br /> if (!bRet)<br /> return false; </p> <p> switch (modeControl)<br /> {<br /> case ACUIControlMode.Creating:<br /> bRet = ValidateCreatingInput();<br /> break; </p> <p> case ACUIControlMode.ChangableDisplay:<br /> bRet = ValidateChangableDisplayInput();<br /> break; </p> <p> case ACUIControlMode.Customizing:<br /> bRet = ValidateCustomizingInput();<br /> break; </p> <p> case ACUIControlMode.Customizing2:<br /> bRet = ValidateCustomizing2Input();<br /> break; </p> <p> case ACUIControlMode.Customizing3:<br /> bRet = ValidateCustomizing3Input();<br /> break; </p> <p> default:<br /> System.Diagnostics.Debug.WriteLine("Entering some mode which should NEVER occurred!");<br /> break;<br /> } </p> <p> return bRet;<br /> }<br /> public Boolean SetCurrentContent(Object obj)<br /> {<br /> if (!flagInit)<br /> return false; </p> <p> // For creating mode, it doesn't allowed to set another object<br /> if (modeControl == ACUIControlMode.Creating)<br /> return false; </p> <p> if (IsNeedSave())<br /> {<br /> if (!SaveChanges())<br /> return false;<br /> } </p> <p> return SetCurrentObjectImpl(obj);<br /> }<br /> public Boolean Uninitialize()<br /> {<br /> if (!flagInit)<br /> return false; </p> <p> if (CleanCurrentMode())<br /> this.flagInit = false;<br /> else<br /> return false; </p> <p> return true;<br /> }<br /> #endregion </p> <p> #region Protected methods<br /> protected void SetMajorModifyFlag(Boolean bFlag)<br /> {<br /> if (flagMajorMod != bFlag)<br /> {<br /> System.Diagnostics.Debug.WriteLine(String.Format("ACUIBaseControl: Modify is changed to {0} in Mode: {1}", bFlag, modeControl));<br /> flagMajorMod = bFlag;<br /> if (MajorModifyFlagHandler != null)<br /> MajorModifyFlagHandler(this, null);<br /> }<br /> }<br /> #endregion </p> <p> #region Virtual methods<br /> protected virtual Boolean InitializeAllModes()<br /> {<br /> return true;<br /> }<br /> protected virtual Boolean InitializeCreatingMode()<br /> {<br /> // Do NOTHING here<br /> return true;<br /> }<br /> protected virtual Boolean InitializeReadOnlyDisplayMode()<br /> {<br /> return true;<br /> }<br /> protected virtual Boolean InitializeChangableDisplayMode()<br /> {<br /> return true;<br /> }<br /> protected virtual Boolean InitializeCustomizingMode()<br /> {<br /> return true;<br /> }<br /> protected virtual Boolean InitializeCustomizing2Mode()<br /> {<br /> return true;<br /> }<br /> protected virtual Boolean InitializeCustomizing3Mode()<br /> {<br /> return true;<br /> }<br /> protected virtual Boolean SaveCreatingChanges()<br /> {<br /> return true;<br /> }<br /> protected virtual Boolean SaveChangableDisplayChanges()<br /> {<br /> return true;<br /> }<br /> protected virtual Boolean SaveCustomizingChanges()<br /> {<br /> return true;<br /> }<br /> protected virtual Boolean SaveCustomizing2Changes()<br /> {<br /> return true;<br /> }<br /> protected virtual Boolean SaveCustomizing3Changes()<br /> {<br /> return true;<br /> }<br /> protected virtual Boolean ValidateAllModes()<br /> {<br /> return true;<br /> }<br /> protected virtual Boolean ValidateCreatingInput()<br /> {<br /> return true;<br /> }<br /> protected virtual Boolean ValidateChangableDisplayInput()<br /> {<br /> return true;<br /> }<br /> protected virtual Boolean ValidateCustomizingInput()<br /> {<br /> return true;<br /> }<br /> protected virtual Boolean ValidateCustomizing2Input()<br /> {<br /> return true;<br /> }<br /> protected virtual Boolean ValidateCustomizing3Input()<br /> {<br /> return true;<br /> }<br /> protected virtual Boolean TransferData()<br /> {<br /> return true;<br /> }<br /> public virtual Boolean IsNeedSave()<br /> {<br /> if (modeControl == ACUIControlMode.Creating)<br /> return true;<br /> else if (modeControl == ACUIControlMode.ReadOnlyDisplay)<br /> return false;<br /> else if (modeControl == ACUIControlMode.ChangableDisplay)<br /> return flagMajorMod; </p> <p> return false;<br /> }<br /> protected virtual Boolean SetCurrentObjectImpl(Object obj)<br /> {<br /> return true;<br /> }<br /> protected virtual Boolean CleanCurrentMode()<br /> {<br /> return true;<br /> }<br /> #endregion<br /> }

其中，Save时需要涉及的EventArgs以及对应的Delegate：

public sealed class ACUIBaseControlSaveEventArgs : EventArgs<br /> {<br /> #region Constructor<br /> public ACUIBaseControlSaveEventArgs()<br /> : base()<br /> { }<br /> public ACUIBaseControlSaveEventArgs(Object obj)<br /> : this()<br /> {<br /> insObj = obj;<br /> }<br /> #endregion </p> <p> #region Fields<br /> private Object insObj = null;<br /> #endregion </p> <p> #region Properties<br /> public Object InstanceObject<br /> {<br /> get { return insObj; }<br /> }<br /> #endregion<br /> } </p> <p>public delegate void ACUIBaseControlSaveModifications(ACUIBaseControlSaveEventArgs e);