PTLib
Version 2.10.4
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00001 /* 00002 * notifier_ext.h 00003 * 00004 * Smart Notifiers and Notifier Lists 00005 * 00006 * Portable Windows Library 00007 * 00008 * Copyright (c) 2004 Reitek S.p.A. 00009 * 00010 * The contents of this file are subject to the Mozilla Public License 00011 * Version 1.0 (the "License"); you may not use this file except in 00012 * compliance with the License. You may obtain a copy of the License at 00013 * http://www.mozilla.org/MPL/ 00014 * 00015 * Software distributed under the License is distributed on an "AS IS" 00016 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See 00017 * the License for the specific language governing rights and limitations 00018 * under the License. 00019 * 00020 * The Original Code is Portable Windows Library. 00021 * 00022 * The Initial Developer of the Original Code is Post Increment 00023 * 00024 * Contributor(s): ______________________________________. 00025 * 00026 * $Revision: 21788 $ 00027 * $Author: rjongbloed $ 00028 * $Date: 2008-12-11 23:42:13 -0600 (Thu, 11 Dec 2008) $ 00029 */ 00030 00031 #ifndef PTLIB_NOTIFIER_EXT_H 00032 #define PTLIB_NOTIFIER_EXT_H 00033 00034 #ifdef P_USE_PRAGMA 00035 #pragma interface 00036 #endif 00037 00046 class PSmartNotifieeRegistrar 00047 { 00048 public: 00049 PSmartNotifieeRegistrar() : m_ID(P_MAX_INDEX) {} 00050 ~PSmartNotifieeRegistrar() { UnregisterNotifiee(m_ID); } 00051 00052 void Init(void * obj) { if (m_ID == P_MAX_INDEX) m_ID = RegisterNotifiee(obj); } 00053 unsigned GetID() const { return m_ID; } 00054 00055 static unsigned RegisterNotifiee(void * obj); 00056 static PBoolean UnregisterNotifiee(unsigned id); 00057 static PBoolean UnregisterNotifiee(void * obj); 00058 static void * GetNotifiee(unsigned id); 00059 00060 protected: 00061 unsigned m_ID; 00062 }; 00063 00064 class PSmartNotifierFunction : public PNotifierFunction 00065 { 00066 PCLASSINFO(PSmartNotifierFunction, PNotifierFunction); 00067 00068 protected: 00069 unsigned m_NotifieeID; 00070 00071 public: 00072 PSmartNotifierFunction(unsigned id) : PNotifierFunction(&id), m_NotifieeID(id) { } 00073 unsigned GetNotifieeID() const { return m_NotifieeID; } 00074 void * GetNotifiee() const { return PSmartNotifieeRegistrar::GetNotifiee(m_NotifieeID); } 00075 PBoolean IsValid() const { return GetNotifiee() != 0; } 00076 }; 00077 00078 #define PDECLARE_SMART_NOTIFIEE \ 00079 PSmartNotifieeRegistrar m_Registrar; \ 00080 00081 #define PCREATE_SMART_NOTIFIEE m_Registrar.Init(this) 00082 00083 #define PDECLARE_SMART_NOTIFIER(notifier, notifiee, func) \ 00084 class func##_PSmartNotifier : public PSmartNotifierFunction { \ 00085 public: \ 00086 func##_PSmartNotifier(unsigned id) : PSmartNotifierFunction(id) { } \ 00087 virtual void Call(PObject & note, INT extra) const \ 00088 { \ 00089 void * obj = GetNotifiee(); \ 00090 if (obj) \ 00091 ((notifiee*)obj)->func((notifier &)note, extra); \ 00092 else \ 00093 PTRACE(2, "PWLib\tInvalid notifiee"); \ 00094 } \ 00095 }; \ 00096 friend class func##_PSmartNotifier; \ 00097 virtual void func(notifier & note, INT extra) 00098 00099 #define PCREATE_SMART_NOTIFIER(func) PNotifier(new func##_PSmartNotifier(m_Registrar.GetID())) 00100 00101 00102 class PNotifierList : public PObject 00103 { 00104 PCLASSINFO(PNotifierList, PObject); 00105 private: 00106 PLIST(_PNotifierList, PNotifier); 00107 00108 _PNotifierList m_TheList; 00109 00110 // Removes smart pointers to deleted objects 00111 void Cleanup(); 00112 00113 public: 00114 PINDEX GetSize() const { return m_TheList.GetSize(); } 00115 00116 void Add(PNotifier * handler) { m_TheList.Append(handler); } 00117 void Remove(PNotifier * handler) { m_TheList.Remove(handler); } 00118 PBoolean RemoveTarget(PObject * obj); 00119 PBoolean Fire(PObject& obj, INT val = 0); 00120 00121 // Moves all the notifiers in "that" to "this" 00122 void Move(PNotifierList& that); 00123 }; 00124 00125 00126 #endif // PTLIB_NOTIFIER_EXT_H 00127 00128 00129 // End of File ///////////////////////////////////////////////////////////////