bool mitk::EventStateMachine::HandleEvent(InteractionEvent* event, DataNode* dataNode)
{
if (!FilterEvents(event, dataNode))
{
return false;
}
// check if the current state holds a transition that works with the given event.
StateMachineTransition::Pointer transition = m_CurrentState->GetTransition(event->GetNameOfClass(), MapToEventVariant(event));
if (transition.IsNotNull())
{
// iterate over all actions in this transition and execute them
ActionVectorType actions = transition->GetActions();
bool success = false;
for (ActionVectorType::iterator it = actions.begin(); it != actions.end(); ++it)
{
success |= ExecuteAction(*it, event); // treat an event as handled if at least one of the actions is executed successfully
}
if (success || actions.empty()) // an empty action list is always successful
{
// perform state change
m_CurrentState = transition->GetNextState();
//MITK_INFO<< "StateChange: " << m_CurrentState->GetName();
}
return success;
}
else
{
return false; // no transition found that matches event
}
}
bool mitk::EventStateMachine::HandleEvent(InteractionEvent* event, DataNode* dataNode)
{
if (!m_IsActive)
return false;
if (!FilterEvents(event, dataNode))
{
return false;
}
// Get the transition that can be executed
mitk::StateMachineTransition::Pointer transition = GetExecutableTransition( event );
// check if the current state holds a transition that works with the given event.
if ( transition.IsNotNull() )
{
// all conditions are fulfilled so we can continue with the actions
m_CurrentState = transition->GetNextState();
// iterate over all actions in this transition and execute them
ActionVectorType actions = transition->GetActions();
for (ActionVectorType::iterator it = actions.begin(); it != actions.end(); ++it)
{
try
{
ExecuteAction(*it, event);
}
catch( const std::exception& e )
{
MITK_ERROR << "Unhandled excaption caught in ExecuteAction(): " << e.what();
return false;
}
catch( ... )
{
MITK_ERROR << "Unhandled excaption caught in ExecuteAction()";
return false;
}
}
return true;
}
return false;
}