eventfilter.h

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//--- < EVENTFILTER.H > ---------| ViewGraph - A Flexible Graph view Framework |
//
// Event filters do not let specific events
// to pass further down. 
// Use these when efficiency is critical or
// when you want to restrict certain nodes 
// from some activity. Can be useful when 
// placed above groups.
// 
// $Author: botik32 $
// $Revision: 1.1.1.1 $
// $Date: 2004/03/26 10:50:26 $
//-----------------------------------------------------------------------------/

#ifndef EVENTFILTER_H
#define EVENTFILTER_H

#include <map>
#include <cZUI/event.h>
#include <cZUI/scenenode.h>

using namespace std;

class EventFilter : public SceneNode
{
protected:
        map<const char*, int> events;
        virtual bool filter( Event * )=0;
public:
        void add_event( const char* );
        void delete_event( const char* );

        bool handle_event( Event * );
        EventFilter( BaseSceneNode * );
};

// Message filter with default ALLOW policy.
// (i.e. all messages are allowed except the
// ones registered with the filter)
class AllowEventFilter : public EventFilter
{
protected:
        bool filter( Event * );
public:
        AllowEventFilter( BaseSceneNode * );
};

// Message filter with default DENY policy.
// (i.e. all messages are forbidden except the
// ones registered with the filter)
class DenyEventFilter : public EventFilter
{
protected:
        bool filter( Event * );
public:
        DenyEventFilter( BaseSceneNode * );
};

// AreaFilters disallow all events in some area.
// These are of little use usually; however,
// they can be inherited from together with 
// one of the event filters, to provide 
// area-specific event filtering.
class AreaFilter : public SceneNode
{
protected:
        double x1, y1, x2, y2;
        virtual bool filter( Event * );
public:
        AreaFilter( BaseSceneNode *, 
                double, double, double, double );
        bool handle_event( Event * );
};

// Message filter with default ALLOW policy.
// (i.e. all messages are allowed except the
// ones registered with the filter).
// Restricted to a certain area.
class AllowAreaFilter : public AllowEventFilter, 
        public AreaFilter
{
protected:
        bool filter( Event * );
public:
        AllowAreaFilter( BaseSceneNode* ,
                double, double, double, double );
};

// Message filter with default DENY policy.
// (i.e. all messages are forbidden except the
// ones registered with the filter)
// Restricted to a certain area.
class DenyAreaFilter : public DenyEventFilter, 
        public AreaFilter
{
protected:
        bool filter( Event * );
public:
        DenyAreaFilter( BaseSceneNode* ,
                double, double, double, double );
};

#endif

---