89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
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#ifndef EVENTSBASE_H
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#define EVENTSBASE_H
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#include "Module.h"
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#include <boost/shared_ptr.hpp>
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#include <string>
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#include <map>
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#include <vector>
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#include <queue>
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namespace Engine {
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/** \brief Contains all information relevant to the Event */
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struct EventBase {
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int mEventType;
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/** \brief This might later be used for de-/serializing of the event data */
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std::string mEventData;
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float mEventFloat;
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int mEventInt;
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unsigned int mEventUnsignedInt;
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};
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typedef boost::shared_ptr<EventBase> EventBasePtr;
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/** \brief Takes care of the handling of the Event
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*
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* Processing of the Event is done in the EventListenerBase::HandleEvent()
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* function.
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*/
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class EventListenerBase {
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public:
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virtual ~EventListenerBase() {};
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/** \brief Handles the Event */
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virtual bool HandleEvent (const EventBasePtr &event) const = 0;
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void just_for_the_vtable() {};
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/** \brief For debugging */
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std::string mName;
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};
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typedef boost::shared_ptr<EventListenerBase> EventListenerPtr;
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/** \brief Keeps track of all the EventListenerBase objects and receives Event notifications.
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*/
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class EventManager : public Module {
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public:
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virtual ~EventManager() {};
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/** \brief Registers a listener to a given event type */
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bool RegisterListener (const EventListenerBase *listener, const int event_type);
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/** \brief Calls all event listeners to handle the events */
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void Process ();
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/** \brief Queues the until Process() gets called */
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bool QueueEvent (const EventBasePtr &event);
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/** \brief Calls the listener handlers immediately */
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bool TriggerEvent (const EventBasePtr &event);
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/** \brief Returns true if there is a listener for a given event type */
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bool HasEventTypeListener (const int event_type) {
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return mEventTypeListeners.find(event_type) != mEventTypeListeners.end();
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}
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/** \brief Returns the number of listeners for a given event type */
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unsigned int GetEventTypeListenerCount (const int event_type) {
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if (!HasEventTypeListener (event_type))
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return 0;
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return (mEventTypeListeners.find(event_type))->second.size();
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}
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unsigned int GetQueuedEventCount () {
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return mQueuedEvents.size();
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}
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protected:
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virtual int OnInit (int argc, char* argv[]);
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virtual void OnDestroy();
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private:
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/** \brief Contains for each event type the list of listeners */
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std::map <int, std::vector<const EventListenerBase*> > mEventTypeListeners;
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std::queue <EventBasePtr> mQueuedEvents;
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};
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}
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#endif /* EVENTSBASE_H */
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