// /////////////////////////////////////////////////////////////////
//
// /////////////////////////////////////////////////////////////////
bool EventManager::VQueueEvent ( IEventDataPtr const & inEvent )
{
assert ( m_activeQueue >= 0 );
assert ( m_activeQueue < kNumQueues );
if ( ! VValidateType( inEvent->VGetEventType() ) )
return false;
EventListenerMap::const_iterator it =
m_registry.find( inEvent->VGetEventType().getHashValue() );
if ( it == m_registry.end() )
{
// if global listener is not active, then abort queue add
EventListenerMap::const_iterator itWC = m_registry.find( 0 );
if ( itWC == m_registry.end() )
{
// no listeners for this event, skipit
return false;
}
}
m_queues[m_activeQueue].push_back( inEvent );
return true;
}
// /////////////////////////////////////////////////////////////////
//
// /////////////////////////////////////////////////////////////////
EventListenerList EventManager::GetListenerList(EventType const &eventType) const
{
// invalid event type, so sad
if ( ! VValidateType( eventType ) )
return EventListenerList();
EventListenerMap::const_iterator itListeners =
m_registry.find( eventType.getHashValue() );
// no listerners currently for this event type, so sad
if ( itListeners == m_registry.end() )
return EventListenerList();
EventListenerTable const & table = itListeners->second;
// there was, but is not now, any listerners currently for
// this event type, so sad
if ( table.size() == 0 )
return EventListenerList();
EventListenerList result;
result.reserve( table.size() );
for ( EventListenerTable::const_iterator it = table.begin(),
end = table.end(); it != end ; it++ )
{
result.push_back( *it );
}
return result;
}
// Remove a listener/type pairing from the internal tables
//
// Returns false if the pairing was not found.
//
bool cEventManager::VDelListener (EventListenerPtr const & inListener, cEventType const & inType ){
if ( ! VValidateType( inType ) ) return false;
bool rc = false;
// brute force method, iterate through all existing mapping
// entries looking for the matching listener and remove it.
for ( EventListenerMap::iterator it = m_registry.begin(), itEnd = m_registry.end(); it != itEnd; it++ ){
unsigned int const kEventId = it->first;
EventListenerTable & table = it->second;
for ( EventListenerTable::iterator it2 = table.begin(), it2End = table.end(); it2 != it2End; it2++ ){
if ( *it2 == inListener ){
// found match, remove from table,
table.erase( it2 );
// update return code
rc = true;
// and early-quit the inner loop as addListener()
// code ensures that each listener can only
// appear in one event's processing list once.
break;
}
}
}
return rc;
}
// /////////////////////////////////////////////////////////////////
//
// /////////////////////////////////////////////////////////////////
bool EventManager::VAddListener(EventListenerPtr const &inListener, EventType const & inType)
{
if ( ! VValidateType( inType ) )
return false;
// check / update type list
EventTypeSet::iterator evIt = m_typeList.find( inType );
// find listener map entry, create one if no table already
// exists for this entry ...
EventListenerMap::iterator elmIt =
m_registry.find( inType.getHashValue() );
if ( elmIt == m_registry.end() )
{
EventListenerMapIRes elmIRes = m_registry.insert(
EventListenerMapEnt( inType.getHashValue(),
EventListenerTable() ) );
// whoops, could not insert into map!?!?
if ( elmIRes.second == false )
return false;
// should not be possible, how did we insert and create
// an empty table!?!?!
if ( elmIRes.first == m_registry.end() )
return false;
// store it so we can update the mapped list next ...
elmIt = elmIRes.first;
}
// update the mapped list of listeners, walk the existing
// list (if any entries) to prevent duplicate addition of
// listeners. This is a bit more costly at registration time
// but will prevent the hard-to-notice duplicate event
// propogation sequences that would happen if double-entries
// were allowed.
// note: use reference to make following code more simple
EventListenerTable & evlTable = (*elmIt).second;
for ( EventListenerTable::iterator it = evlTable.begin(),
itEnd = evlTable.end(); it != itEnd ; it++ )
{
bool bListenerMatch = ( *it == inListener );
if ( bListenerMatch )
return false;
}
// okay, event type validated, event listener validated,
// event listener not already in map, add it
evlTable.push_back( inListener );
return true;
}
bool Manager::VDelListener ( ListenerPtr const & inListener, TypeId const & inType )
{
if ( ! VValidateType( inType ) )
return false;
bool rc = false;
for ( EventListenerMap::iterator it = m_registry.begin(),
itEnd = m_registry.end();
it != itEnd; it++ )
{
unsigned int const kEventId = it->first;
EventListenerTable & table = it->second;
for ( EventListenerTable::iterator it2 = table.begin(), it2End = table.end();
it2 != it2End;
it2++ )
{
if ( *it2 == inListener )
{
table.erase( it2 );
rc = true;
break;
}
}
}
return rc;
}
bool Manager::VAddListener ( ListenerPtr const & inListener, TypeId const & inType )
{
if ( ! VValidateType( inType ) )
return false;
TypeIdSet::iterator evIt = m_typeList.find( inType );
EventListenerMap::iterator elmIt = m_registry.find( inType.Value() );
if ( elmIt == m_registry.end() )
{
EventListenerMapIRes elmIRes = m_registry.insert( EventListenerMapEnt( inType.Value(), EventListenerTable() ) );
if ( elmIRes.second == false )
return false;
if ( elmIRes.first == m_registry.end() )
return false;
elmIt = elmIRes.first;
}
EventListenerTable & evlTable = (*elmIt).second;
for ( EventListenerTable::iterator it = evlTable.begin(), itEnd = evlTable.end();
it != itEnd;
it++ )
{
bool bListenerMatch = ( *it == inListener );
if ( bListenerMatch )
return false;
}
evlTable.push_back( inListener );
return true;
}
//
// EventManager::VTrigger - Chapter 10, page 293
//
// Fire off event - synchronous - do it NOW kind of thing -
// analogous to Win32 SendMessage() API.
//
// returns true if the event was consumed, false if not. Note
// that it is acceptable for all event listeners to act on an
// event and not consume it, this return signature exists to
// allow complete propogation of that shred of information from
// the internals of this system to outside uesrs.
//
bool EventManager::VTrigger (
IEventData const & inEvent ) const
{
if ( ! VValidateType( inEvent.VGetEventType() ) )
return false;
EventListenerMap::const_iterator itWC = m_registry.find( 0 );
if ( itWC != m_registry.end() )
{
EventListenerTable const & table = itWC->second;
bool processed = false;
for ( EventListenerTable::const_iterator it2 = table.begin(),
it2End = table.end(); it2 != it2End; it2++ )
{
(*it2)->HandleEvent( inEvent );
}
}
EventListenerMap::const_iterator it =
m_registry.find( inEvent.VGetEventType().getHashValue() );
if ( it == m_registry.end() )
return false;
EventListenerTable const & table = it->second;
bool processed = false;
for ( EventListenerTable::const_iterator it2 = table.begin(),
it2End = table.end(); it2 != it2End; it2++ )
{
EventListenerPtr listener = *it2;
if ( listener->HandleEvent( inEvent ) )
{
// only set to true, if processing eats the messages
processed = true;
}
}
return processed;
}
bool Manager::VTrigger ( IData const & inEvent ) const
{
if ( ! VValidateType( inEvent.GetTypeId() ) )
return false;
EventListenerMap::const_iterator itWC = m_registry.find( 0 );
if ( itWC != m_registry.end() )
{
EventListenerTable const & table = itWC->second;
bool processed = false;
for ( EventListenerTable::const_iterator it2 = table.begin(), it2End = table.end();
it2 != it2End;
it2++ )
{
(*it2)->HandleEvent( inEvent );
}
}
EventListenerMap::const_iterator it = m_registry.find( inEvent.GetTypeId().Value() );
if ( it == m_registry.end() )
return false;
EventListenerTable const & table = it->second;
bool processed = false;
for ( EventListenerTable::const_iterator it2 = table.begin(), it2End = table.end();
it2 != it2End;
it2++ )
{
ListenerPtr listener = *it2;
if ( listener->HandleEvent( inEvent ) )
{
processed = true;
}
}
return processed;
}
//
// EventManager::VAbortEvent - Chapter 10, page 295
//
// Find the next-available instance of the named event type and
// remove it from the processing queue.
//
// This may be done up to the point that it is actively being
// processed ... e.g.: is safe to happen during event processing
// itself.
//
// returns true if the event was found and removed, false
// otherwise
//
bool EventManager::VAbortEvent ( EventType const & inType,
bool allOfType )
{
assert ( m_activeQueue >= 0 );
assert ( m_activeQueue < kNumQueues );
if ( ! VValidateType( inType ) )
return false;
EventListenerMap::iterator it = m_registry.find( inType.getHashValue() );
if ( it == m_registry.end() )
return false; // no listeners for this event, skipit
bool rc = false;
// See a good discussion on this code here:
// http://www.mcshaffry.com/GameCode/thread.php?threadid=517&sid=
EventQueue &evtQueue = m_queues[m_activeQueue];
for ( EventQueue::iterator it = evtQueue.begin(),
itEnd = evtQueue.end(); it != itEnd; it++ )
{
if ( (*it)->VGetEventType() == inType )
{
it = evtQueue.erase(it);
rc = true;
if ( !allOfType )
break;
}
else
{
++it;
}
}
return rc;
}
bool Manager::VQueueEvent ( IDataPtr const & inEvent )
{
assert ( m_activeQueue >= 0 );
assert ( m_activeQueue < kNumQueues );
if ( ! VValidateType( inEvent->GetTypeId() ) )
return false;
EventListenerMap::const_iterator it = m_registry.find( inEvent->GetTypeId().Value() );
if ( it == m_registry.end() )
{
EventListenerMap::const_iterator itWC = m_registry.find( 0 );
if ( itWC == m_registry.end() )
{
return false;
}
}
m_queues[m_activeQueue].push_back( inEvent );
return true;
}
bool Manager::VAbortEvent ( TypeId const & inType, bool allOfType )
{
assert ( m_activeQueue >= 0 );
assert ( m_activeQueue < kNumQueues );
if ( ! VValidateType( inType ) )
return false;
EventListenerMap::iterator it = m_registry.find( inType.Value() );
if ( it == m_registry.end() )
return false; // no listeners for this event, skipit
bool rc = false;
EventQueue &evtQueue = m_queues[m_activeQueue];
for ( EventQueue::iterator it = evtQueue.begin(), itEnd = evtQueue.end();
it != itEnd;
it++ )
{
if ( (*it)->GetTypeId() == inType )
{
it = evtQueue.erase(it);
rc = true;
if ( !allOfType )
break;
}
else
{
++it;
}
}
return rc;
}
