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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
* Copyright 2008-2013 Pelican Mapping
* http://osgearth.org
*
* osgEarth is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>
*/
#ifndef OSGEARTH_UTIL_ANNOTATION_EVENTS_H
#define OSGEARTH_UTIL_ANNOTATION_EVENTS_H 1

#include <osgEarthUtil/Common>
#include <osgEarthAnnotation/AnnotationNode>
#include <set>

namespace osgEarth { namespace Util
{	
    using namespace osgEarth::Util;
    using namespace osgEarth::Annotation;

    /**
     * Event handler skeleton for handling events from the AnnotationEventCallback.
     */
    struct AnnotationEventHandler : public osg::Referenced
    {
        struct EventArgs
        {
            float x, y;
            int   buttons;   // see osgGA::GUIEventAdapter::MouseButtonMask
            int   modkeys;   // see osgGA::GUIEventAdapter::ModKeyMask
        };

        virtual void onClick( AnnotationNode* node, const EventArgs& details ) { }

        virtual void onHoverEnter( AnnotationNode* node, const EventArgs& details ) { }

        virtual void onHoverLeave( AnnotationNode* node, const EventArgs& details ) { }

        virtual ~AnnotationEventHandler() { }
    };

    /**
     * Event-traversal node callback that handles user interaction with 
     * annotation objects.
     */
    class OSGEARTHUTIL_EXPORT AnnotationEventCallback : public osg::NodeCallback
    {
    public:
        AnnotationEventCallback( AnnotationEventHandler* handler =0L );

        /** 
         * Adds an event handler whose events will fire upon user actions
         */
        void addHandler( AnnotationEventHandler* handler );

        /**
         * Sets whether "hovering" events will fire. By default they do. But you 
         * can disable this (if you're not using hovering) and get a small
         * performance improvement.
         */
        void setHoverEnabled( bool hoverEnabled );

    public: // osg::NodeCallback

        virtual void operator()( osg::Node* node, osg::NodeVisitor* nv );

    protected:

        virtual ~AnnotationEventCallback() { }

        AnnotationEventHandler::EventArgs _args;
        bool  _mouseDown;
        bool _hoverEnabled;
        std::set<AnnotationNode*> _hovered;

        typedef std::vector< osg::ref_ptr<AnnotationEventHandler> > Handlers;
        Handlers _handlers;

        typedef void (AnnotationEventHandler::*EventHandlerMethodPtr)(AnnotationNode*,const AnnotationEventHandler::EventArgs&);
        void fireEvent(EventHandlerMethodPtr mp, AnnotationNode* node);
    };

} } // namespace osgEarth::Annotation

#endif // OSGEARTH_ANNO_ANNOTATION_NODE_H