//--
// EventManager::AddScriptListener - Chapter 11, page 336
//
// Creates a script-side event listener, given an appropriate Lua function.
bool cEventManager::AddScriptListener( char const * const pEventName, LuaObject callbackFunction )
{
//Ensure this event type exists.
const EventType testEventType( pEventName );
const EventTypeSet::const_iterator typeIter = m_typeList.find( testEventType );
if ( m_typeList.end() == typeIter ){
printf("event not registered and listened!\n");
return false;
}
const unsigned int eventID = testEventType.getHashValue();
//OK, valid event type. Make sure this isn't a duplicate.
ScriptEventListenerMap::const_iterator mapIter = m_ScriptEventListenerMap.find( eventID );
while ( m_ScriptEventListenerMap.end() != mapIter ){
//Iterate through and ensure no duplicates.
const ScriptEventListenerPtr evtListener = mapIter->second;
const LuaObject & evtObj = evtListener->GetHandlerFunction();
if ( evtObj == callbackFunction )
{
assert( 0 && "Attempted to listen to the same event handler twice!" );
return false;
}
++mapIter;
}
//Now let's rez up a new script listener.
ScriptEventListenerPtr listener( new ScriptEventListener( callbackFunction ) );
m_ScriptEventListenerMap.insert( std::make_pair( eventID, listener ) );
const bool bSuccess = VAddListener( listener, testEventType );
return bSuccess;
}
// /////////////////////////////////////////////////////////////////
//
// /////////////////////////////////////////////////////////////////
bool EventManager::RemoveScriptListener(const char *const pEventName, LuaObject callbackFunction)
{
//Ensure this event type exists.
const EventType testEventType( pEventName );
const EventTypeSet::const_iterator typeIter = m_typeList.find( testEventType );
if ( m_typeList.end() == typeIter )
{
assert( 0 && "Attempted to remove a listener for an event type that doesn't exist!" );
return false;
}
const U64 eventID = testEventType.getHashValue();
//OK, now ensure it exists in the multimap.
bool bFound = false;
ScriptEventListenerMap::iterator mapIter = m_ScriptEventListenerMap.find( eventID );
while ( m_ScriptEventListenerMap.end() != mapIter )
{
const ScriptEventListenerPtr evtListener = mapIter->second;
const LuaObject & evtObj = evtListener->GetHandlerFunction();
if ( evtObj == callbackFunction )
{
bFound = true;
break;
}
++mapIter;
}
if ( false == bFound )
{
assert( 0 && "Attempted to remove a script listener for an event it was never listening for!" );
return false;
}
//Remove this listener from the map.
const ScriptEventListenerPtr listener = mapIter->second;
m_ScriptEventListenerMap.erase( mapIter );
//Now remove from the "main" listener set.
const bool bSuccess = VDelListener( listener, testEventType );
return bSuccess;
}
