text: /*
       File: CarbonEventHandler.cpp
   Abstract: CarbonEventHandler.h
    Version: 1.1
  
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  */
  
  #include "CarbonEventHandler.h"
  
  static pascal OSStatus TheEventHandler(EventHandlerCallRef inHandlerRef, EventRef inEvent, void *inUserData)
  {
  	CarbonEventHandler *handler = (CarbonEventHandler *)inUserData;
  	if (handler->HandleEvent(inHandlerRef, inEvent))
  		return noErr;
  	else return eventNotHandledErr;
  }
  
  CarbonEventHandler::CarbonEventHandler() :
  	mHandlers(NULL)
  {
  }
  
  CarbonEventHandler::~CarbonEventHandler()
  {
  	if (mHandlers != NULL) {
  		int count = static_cast<int>(CFDictionaryGetCount(mHandlers));
  		EventHandlerRef *theHandlers = (EventHandlerRef*) malloc(count * sizeof(EventHandlerRef));
  		CFDictionaryGetKeysAndValues(mHandlers, NULL, (const void **)theHandlers);
  
  		for (int i = 0; i < count; i++)
  			RemoveEventHandler(theHandlers[i]);
  		CFDictionaryRemoveAllValues(mHandlers);
  		CFRelease (mHandlers);
  		free(theHandlers);
  	}
  }
  
  void	CarbonEventHandler::WantEventTypes(EventTargetRef target, UInt32 inNumTypes, const EventTypeSpec *inList)
  {
  	if (mHandlers == NULL)
  		mHandlers = CFDictionaryCreateMutable(NULL, 0, NULL, NULL);
  
  	EventHandlerRef handler;
  
  	if (CFDictionaryGetValueIfPresent (mHandlers, target, (const void **)&handler))	// if there is already a handler for the target, add the type
  		verify_noerr(AddEventTypesToHandler(handler, inNumTypes, inList));
  	else {
  		verify_noerr(InstallEventHandler(target, TheEventHandler, inNumTypes, inList, this, &handler));
  		CFDictionaryAddValue(mHandlers, target, handler);
  	}
  }
  