qgsvectortileloader.h

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/***************************************************************************
  qgsvectortileloader.h
  --------------------------------------
  Date                 : March 2020
  Copyright            : (C) 2020 by Martin Dobias
  Email                : wonder dot sk at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSVECTORTILELOADER_H
#define QGSVECTORTILELOADER_H
 
#define SIP_NO_FILE
 
#include "qgstiles.h"
 
class QgsFeedback;
class QgsTileDownloadManagerReply;
class QgsVectorTileDataProvider;
 
class QByteArray;
class QNetworkReply;
class QEventLoop;
 

class CORE_EXPORT QgsVectorTileRawData
{
  public:
    QgsVectorTileRawData( QgsTileXYZ tileID = QgsTileXYZ(), const QByteArray &data = QByteArray() )
      : id( tileID ), tileGeometryId( tileID ), data( { { QString(), data } } ) {}

    QgsVectorTileRawData( QgsTileXYZ tileID, const QMap<QString, QByteArray> &data )
      : id( tileID ), tileGeometryId( tileID ), data( data ) {}

    QgsTileXYZ id;

    QgsTileXYZ tileGeometryId;

    QMap<QString, QByteArray> data;
};
 

class CORE_EXPORT QgsVectorTileLoader : public QObject
{
    Q_OBJECT
  public:

    static QList<QgsVectorTileRawData> blockingFetchTileRawData(
      const QgsVectorTileDataProvider *provider,
      const QgsTileMatrixSet &tileMatrixSet,
      const QPointF &viewCenter,
      const QgsTileRange &range,
      int zoomLevel,
      QgsFeedback *feedback = nullptr,
      Qgis::RendererUsage usage = Qgis::RendererUsage::Unknown );
 
    //
    // non-static stuff
    //

    QgsVectorTileLoader( const QgsVectorTileDataProvider *provider, const QgsTileMatrixSet &tileMatrixSet, const QgsTileRange &range, int zoomLevel, const QPointF &viewCenter,
                         QgsFeedback *feedback, Qgis::RendererUsage usage );
    ~QgsVectorTileLoader() override;

    void downloadBlocking();

    QString error() const;
 
  private:
    void loadFromNetworkAsync( const QgsTileXYZ &id, const QgsTileMatrixSet &tileMatrixSet, const QgsVectorTileDataProvider *provider, Qgis::RendererUsage usage );
 
  private slots:
    void tileReplyFinished();
    void canceled();
 
  signals:
    void tileRequestFinished( const QgsVectorTileRawData &rawTile );
 
  private:
    std::unique_ptr<QEventLoop> mEventLoop;
    QgsFeedback *mFeedback;

    QHash<QgsTileXYZ, QList<QgsTileDownloadManagerReply *>> mReplies;

    QHash<QgsTileXYZ, QMap<QString, QByteArray>> mPendingRawData;
 
    QString mError;
};
 
#endif // QGSVECTORTILELOADER_H