NearPOIModel.h

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#ifndef OSMSCOUT_CLIENT_QT_NEARPOIMODEL_H
#define OSMSCOUT_CLIENT_QT_NEARPOIMODEL_H
 
/*
 OSMScout - a Qt backend for libosmscout and libosmscout-map
 Copyright (C) 2018 Lukas Karas
 
  This library 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 2.1 of the License, or (at your option) any later version.
 
  This library 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 library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
 */
 
#include <osmscoutclient/POILookupModule.h>
 
#include <osmscoutclientqt/LocationEntry.h>
 
#include <osmscoutclientqt/ClientQtImportExport.h>
 
#include <QObject>
#include <QAbstractListModel>
 
#include <functional>
#include <optional>
 
namespace osmscout {
 
#define INVALID_COORD -1000.0

class OSMSCOUT_CLIENT_QT_API NearPOIModel: public QAbstractListModel
{
Q_OBJECT
  Q_PROPERTY(int      count       READ rowCount    NOTIFY countChanged)
 
  
  Q_PROPERTY(bool     searching   READ isSearching NOTIFY SearchingChanged)

  Q_PROPERTY(double   lat         READ GetLat      WRITE SetLat)

  Q_PROPERTY(double   lon         READ GetLon      WRITE SetLon)

  Q_PROPERTY(double   maxDistance READ GetMaxDistance WRITE SetMaxDistance)

  Q_PROPERTY(int      resultLimit READ GetResultLimit WRITE SetResultLimit)

  Q_PROPERTY(QStringList types READ GetTypes WRITE SetTypes)
 
public:
  enum Roles {
    LabelRole = Qt::UserRole,
    TypeRole = Qt::UserRole +1,
    RegionRole = Qt::UserRole +2,
    LatRole = Qt::UserRole +3,
    LonRole = Qt::UserRole +4,
    DistanceRole = Qt::UserRole +5,
    BearingRole = Qt::UserRole +6,
    LocationObjectRole = Qt::UserRole +7,
    AltLangName = Qt::UserRole +8
  };
  Q_ENUM(Roles)
 
signals:
  void countChanged(int);
 
  void SearchingChanged(bool);
 
  void lookupFinished(int requestId);
  void lookupResult(int requestId, QList<LocationEntry> locations);
 
public slots:
  void onLookupFinished(int requestId);
  void onLookupResult(int requestId, QList<LocationEntry> locations);
 
private:
  int currentRequest{0};
  QList<LocationEntryRef> locations;
  osmscout::GeoCoord searchCenter{INVALID_COORD,INVALID_COORD};
  int resultLimit{100};
  std::optional<POILookupModule::LookupFuture> future;
  Distance maxDistance{Distance::Of<Kilometer>(1)};
  QStringList types;
 
  POILookupModule *poiModule{nullptr};
  SettingsRef settings;
 
  Slot<int> lookupFinishedSlot{ std::bind(&NearPOIModel::lookupFinished, this, std::placeholders::_1) };
 
  Slot<int, POILookupModule::LookupResult> lookupResultSlot {
    [this](int requestId, const POILookupModule::LookupResult &locationsVector) {
      QList<LocationEntry> locations;
      for (const auto &info: locationsVector) {
        locations << LocationEntry(info);
      }
      emit lookupResult(requestId, locations);
    }
  };
 
public:
  NearPOIModel();
  ~NearPOIModel() override;
 
  Q_INVOKABLE QVariant data(const QModelIndex &index, int role) const override;
 
  Q_INVOKABLE int rowCount(const QModelIndex &parent = QModelIndex()) const override;
 
  Q_INVOKABLE Qt::ItemFlags flags(const QModelIndex &index) const override;
 
  Q_INVOKABLE QObject* get(int row) const;
 
  QHash<int, QByteArray> roleNames() const override;
 
  inline bool isSearching() const
  {
    return future.has_value();
  }
 
  inline double GetLat() const
  {
    return searchCenter.GetLat();
  }
 
  void SetLat(double lat)
  {
    if (lat!=searchCenter.GetLat()) {
      searchCenter.Set(lat, searchCenter.GetLon());
      lookupPOI();
    }
  }
 
  inline double GetLon() const
  {
    return searchCenter.GetLon();
  }
 
  void SetLon(double lon)
  {
    if (lon!=searchCenter.GetLon()){
      searchCenter.Set(searchCenter.GetLat(), lon);
      lookupPOI();
    }
  }
 
  inline double GetMaxDistance() const
  {
    return maxDistance.AsMeter();
  }
 
  void SetMaxDistance(double d)
  {
    if (maxDistance.AsMeter()!=d){
      maxDistance=Distance::Of<Meter>(d);
      lookupPOI();
    }
  }
 
  inline int GetResultLimit() const
  {
    return resultLimit;
  }
 
  inline void SetResultLimit(int limit)
  {
    if (resultLimit!=limit){
      resultLimit=limit;
      lookupPOI();
    }
  }
 
  inline QStringList GetTypes() const
  {
    return types;
  }
 
  inline void SetTypes(QStringList t)
  {
    if (types!=t){
      types=t;
      lookupPOI();
    }
  }
 
private:
  void lookupPOI();
};
 
}
 
#endif //OSMSCOUT_CLIENT_QT_NEARPOIMODEL_H