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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 OSGEARTHQT_LOSCONTROLWIDGET_H
#define OSGEARTHQT_LOSCONTROLWIDGET_H 1

#include <osgEarthQt/Actions>
#include <osgEarthQt/CollapsiblePairWidget>
#include <osgEarthQt/Common>
#include <osgEarthQt/DataManager>

#include <osgEarthUtil/LinearLineOfSight>
#include <osgEarthUtil/RadialLineOfSight>

#include <osgGA/GUIEventHandler>

#include <QAction>
#include <QCheckBox>
#include <QDoubleSpinBox>
#include <QFrame>
#include <QLabel>
#include <QLineEdit>
#include <QListWidget>
#include <QPointer>
#include <QSpinBox>
#include <QWidget>

namespace osgEarth { namespace QtGui 
{
    using namespace osgEarth;

    class LOSCreationDialog;
    struct LOSControlMouseHandler;
    class OSGEARTHQT_EXPORT LOSControlWidget : public CollapsiblePairWidget
    {
    Q_OBJECT

    public:
      LOSControlWidget(osg::Group* root, osgEarth::MapNode* mapNode, DataManager* dm=0L);

      void setActiveView(osgViewer::View* view);
      void setActiveViews(const ViewVector& views);

    private slots:
	    void onItemDoubleClicked(QListWidgetItem* item);
      void onItemChanged(QListWidgetItem* item);
      void onItemSelectionChanged();

      void onDepthBoxChanged(int state);
      void onRadiusValueChanged(double value);
      void onSpokesValueChanged(int value);

      void onAddLOS();
      void onRemoveSelectedLOS();
      void onEditSelectedLOS();
      void onCreateFinished(int result);
      void onEditFinished(int result);

    protected:
      virtual ~LOSControlWidget() { }
      friend struct LOSControlMouseHandler;

      void initialize();
      void addLOSNode(osg::Group* los, const std::string& name);
      void addView(osgViewer::View* view);
      void removeViews();
      void mapClick(const osg::Vec3d& point);

      QListWidget*       _losList;
      QFrame*            _detailsBox;
      QLabel*            _nameField;
      QLabel*            _typeField;
      QCheckBox*         _depthBox;
      QDoubleSpinBox*    _radiusBox;
      QSpinBox*          _spokesBox;
      QAction*           _removeAction;
      QAction*           _editAction;
      QPointer<LOSCreationDialog>  _newDialog;
      

      osg::ref_ptr<osg::Group>              _root;
      osg::ref_ptr<osgEarth::MapNode>       _mapNode;
      osg::ref_ptr<DataManager>             _manager;
      osg::ref_ptr<osgEarth::Map>           _map;
      ViewVector                            _views;
      //LineOfSightVector                     _losNodes;
      osg::ref_ptr<osgEarth::Util::RadialLineOfSightNode>  _activeRadial;
      int                                   _losCounter;
      osg::ref_ptr<osgGA::GUIEventHandler>  _guiHandler;
    };

    struct LOSControlMouseHandler : public osgGA::GUIEventHandler
    {
      LOSControlMouseHandler(LOSControlWidget* losControl, osgEarth::MapNode* mapNode)
        : _losControl(losControl), _mapNode(mapNode), _mouseDown(false)
      {
        //_mapNodePath.push_back( mapNode->getTerrainEngine() );
      }

      bool handle( const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa )
      {
        osgViewer::View* view = static_cast<osgViewer::View*>(aa.asView());

        if ( ea.getEventType() == osgGA::GUIEventAdapter::PUSH )
        {
          if (ea.getButton() == osgGA::GUIEventAdapter::LEFT_MOUSE_BUTTON)
          {
            _mouseDown = true;
            _xDown = ea.getX();
            _yDown = ea.getY();
          }
        }
        else if (ea.getEventType() == osgGA::GUIEventAdapter::RELEASE)
        {
          if (ea.getButton() == osgGA::GUIEventAdapter::LEFT_MOUSE_BUTTON)
          {
            if (_mouseDown && _xDown == ea.getX() && _yDown == ea.getY())
            {
              osgUtil::LineSegmentIntersector::Intersections results;
              if ( view->computeIntersections( _xDown, _yDown, results ) )
              {
                // find the first hit under the mouse:
                osgUtil::LineSegmentIntersector::Intersection first = *(results.begin());
                osg::Vec3d point = first.getWorldIntersectPoint();

                _losControl->mapClick(point);
              }
            }

            _mouseDown = false;
          }
        }

        return false;
      }

      LOSControlWidget*      _losControl;
      osg::ref_ptr<MapNode>  _mapNode;

      bool _mouseDown;
      float _xDown, _yDown;
    };
} }

#endif // OSGEARTHQT_LOSCONTROLWIDGET_H