■ ICommand 인터페이스에서 대리자 명령을 사용하는 방법을 보여준다.
▶ DelegateCommand.cs
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using System; using System.Collections.Generic; using System.Windows.Input; /// <summary> /// 대리자 명령 /// </summary> public class DelegateCommand : ICommand { //////////////////////////////////////////////////////////////////////////////////////////////////// Event ////////////////////////////////////////////////////////////////////////////////////////// Public #region 실행 가능 여부 변경시 이벤트 - CanExecuteChanged /// <summary> /// 실행 가능 여부 변경시 이벤트 /// </summary> public event EventHandler CanExecuteChanged { add { CommandManager.AddWeakReferenceHandler(ref this.weakReferenceList, value); } remove { CommandManager.RemoveWeakReferenceHandler(this.weakReferenceList, value); } } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 실행 액션 /// </summary> private readonly Action executeAction; /// <summary> /// 실행 가능 여부 함수 /// </summary> private readonly Func<bool> canExecuteFunction; /// <summary> /// 약한 참조 리스트 /// </summary> private List<WeakReference> weakReferenceList; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - DelegateCommand(executeAction, canExecuteFunction) /// <summary> /// 생성자 /// </summary> /// <param name="executeAction">실행 액션</param> /// <param name="canExecuteFunction">실행 가능 여부 함수</param> public DelegateCommand(Action executeAction, Func<bool> canExecuteFunction) { if(executeAction == null) { throw new ArgumentNullException("executeAction"); } this.executeAction = executeAction; this.canExecuteFunction = canExecuteFunction; } #endregion #region 생성자 - DelegateCommand(executeAction) /// <summary> /// 생성자 /// </summary> /// <param name="executeAction">실행 액션</param> public DelegateCommand(Action executeAction) : this(executeAction, null) { } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 실행 가능 여부 구하기 - CanExecute() /// <summary> /// 실행 가능 여부 구하기 /// </summary> /// <returns>실행 가능 여부</returns> public bool CanExecute() { if(this.canExecuteFunction != null) { return this.canExecuteFunction(); } return true; } #endregion #region 실행 가능 여부 구하기 - ICommand.CanExecute(parameter) /// <summary> /// 실행 가능 여부 구하기 /// </summary> /// <param name="parameter">매개 변수</param> /// <returns>실행 가능 여부</returns> bool ICommand.CanExecute(object parameter) { return CanExecute(); } #endregion #region 실행하기 - Execute() /// <summary> /// 실행하기 /// </summary> public void Execute() { if(this.executeAction != null) { this.executeAction(); } } #endregion #region 실행하기 - ICommand.Execute(parameter) /// <summary> /// 실행하기 /// </summary> /// <param name="parameter">매개 변수</param> void ICommand.Execute(object parameter) { Execute(); } #endregion #region 실행 가능 여부 변경시 이벤트 발생시키기 - RaiseCanExecuteChangedEvent() /// <summary> /// 실행 가능 여부 변경시 이벤트 발생시키기 /// </summary> public void RaiseCanExecuteChangedEvent() { FireCanExecuteChangedEvent(); } #endregion ////////////////////////////////////////////////////////////////////////////////////////// Protected #region 실행 가능 여부 변경시 이벤트 발생시키기 - FireCanExecuteChangedEvent() /// <summary> /// 실행 가능 여부 변경시 이벤트 발생시키기 /// </summary> protected virtual void FireCanExecuteChangedEvent() { CommandManager.CallWeakReferenceHandlers(this.weakReferenceList); } #endregion } |
▶ CommandManager.cs
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using System; using System.Collections.Generic; /// <summary> /// 명령 관리자 /// </summary> public class CommandManager { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 약한 참조 핸들러 추가하기 - AddWeakReferenceHandler(weakReferenceList, eventHandler) /// <summary> /// 약한 참조 핸들러 추가하기 /// </summary> /// <param name="weakReferenceList">약한 참조 리스트</param> /// <param name="eventHandler">이벤트 핸들러</param> public static void AddWeakReferenceHandler(ref List<WeakReference> weakReferenceList, EventHandler eventHandler) { if(weakReferenceList == null) { weakReferenceList = new List<WeakReference>(); } weakReferenceList.Add(new WeakReference(eventHandler)); } #endregion #region 약한 참조 핸들러 제거하기 - RemoveWeakReferenceHandler(weakReferenceList, eventHandler) /// <summary> /// 약한 참조 핸들러 제거하기 /// </summary> /// <param name="weakReferenceList">약한 참조 리스트</param> /// <param name="eventHandler">이벤트 핸들러</param> public static void RemoveWeakReferenceHandler(List<WeakReference> weakReferenceList, EventHandler eventHandler) { if(weakReferenceList != null) { for(int i = weakReferenceList.Count - 1; i >= 0; i--) { WeakReference weakReference = weakReferenceList[i]; EventHandler existingEventHandler = weakReference.Target as EventHandler; if((existingEventHandler == null) || (existingEventHandler == eventHandler)) { weakReferenceList.RemoveAt(i); } } } } #endregion #region 약한 참조 핸들러 호출하기 - CallWeakReferenceHandlers(weakReferenceList) /// <summary> /// 약한 참조 핸들러 호출하기 /// </summary> /// <param name="weakReferenceList">약한 참조 리스트</param> public static void CallWeakReferenceHandlers(List<WeakReference> weakReferenceList) { if(weakReferenceList != null) { EventHandler[] eventHandlerArray = new EventHandler[weakReferenceList.Count]; int count = 0; for(int i = weakReferenceList.Count - 1; i >= 0; i--) { WeakReference weakReference = weakReferenceList[i]; EventHandler eventHandler = weakReference.Target as EventHandler; if(eventHandler == null) { weakReferenceList.RemoveAt(i); } else { eventHandlerArray[count] = eventHandler; count++; } } for(int i = 0; i < count; i++) { EventHandler eventHandler = eventHandlerArray[i]; eventHandler(null, EventArgs.Empty); } } } #endregion } |