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#ifndef EVENTBUCKET_H
#define EVENTBUCKET_H
#include "SNAPEvents.h"
#include "itkSimpleFastMutexLock.h"
#include <set>
#include <iostream>
namespace itk
{
class Object;
}
/**
A simple 'bucket' that stores events. You can easily add events to
the bucket and check if events are present there.
TODO: the bucket should keep track of objects that fired the event,
not only the event types!
*/
class EventBucket
{
public:
EventBucket();
virtual ~EventBucket();
/**
* @brief Add an event to the bucket.
*/
void PutEvent(const itk::EventObject &evt, const itk::Object *source);
/**
* @brief Check if the bucket has an event from a source (or from all
* sources if the second parameter has the default value of NULL). This
* method checks for child events, so if AEvent is a parent BEvent and the
* bucket holds a BEvent, then HasEvent(AEvent()) will return true.
*/
bool HasEvent(const itk::EventObject &evt, const itk::Object *source = NULL) const;
bool IsEmpty() const;
void Clear();
unsigned long GetMTime() const { return m_MTime; }
friend std::ostream& operator<<(std::ostream& sink, const EventBucket& eb);
protected:
/**
* The bucket entry consists of a pointer to the event, which the
* bucket owns and destroys when it is destroyed or cleared, and the
* pointer to the originator the event.
*/
typedef std::pair<itk::EventObject *, const itk::Object *> BucketEntry;
typedef std::set<BucketEntry> BucketType;
typedef BucketType::iterator BucketIt;
BucketType m_Bucket;
itk::SimpleFastMutexLock m_Lock;
/** Each bucket has a unique id. This allows code to check whether or not
* it has already handled a bucket or not. This should not really be needed
* because event handlers should never get called twice with the same
* bucket, but it seems that in Qt this does happen sometimes */
unsigned long m_MTime;
static unsigned long m_GlobalMTime;
};
// IO operator
std::ostream& operator<<(std::ostream& sink, const EventBucket& eb);
#endif // EVENTBUCKET_H
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