qgscoordinateoperationwidget.h

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/***************************************************************************
                         qgscoordinateoperationwidget.h
                         ------------------------------
    begin                : December 2019
    copyright            : (C) 2019 by Nyall Dawson
    email                : nyall dot dawson 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 QGSCOORDINATEOPERATIONWIDGET_H
#define QGSCOORDINATEOPERATIONWIDGET_H

#include "ui_qgscoordinateoperationwidgetbase.h"
#include "qgscoordinatereferencesystem.h"
#include "qgis_gui.h"

class GUI_EXPORT QgsCoordinateOperationWidget : public QWidget, private Ui::QgsCoordinateOperationWidgetBase
{
    Q_OBJECT
  public:

    struct OperationDetails
    {
      int sourceTransformId = -1;

      int destinationTransformId = -1;

      QString proj;

      bool isAvailable = true;

      bool allowFallback = true;
    };

    QgsCoordinateOperationWidget( QWidget *parent = nullptr );

    ~QgsCoordinateOperationWidget() override;

    QgsCoordinateReferenceSystem sourceCrs() const { return mSourceCrs; }

    QgsCoordinateReferenceSystem destinationCrs() const { return mDestinationCrs; }

    void setSourceCrs( const QgsCoordinateReferenceSystem &crs );

    void setDestinationCrs( const QgsCoordinateReferenceSystem &crs );

    void setMapCanvas( QgsMapCanvas *canvas );

    void setShowMakeDefault( bool show );

    bool makeDefaultSelected() const;

    bool hasSelection() const;

    QList< QgsCoordinateOperationWidget::OperationDetails > availableOperations() const;

    QgsCoordinateOperationWidget::OperationDetails defaultOperation() const;

    QgsCoordinateOperationWidget::OperationDetails selectedOperation() const;

    void setSelectedOperation( const QgsCoordinateOperationWidget::OperationDetails &operation );

    void setSelectedOperationUsingContext( const QgsCoordinateTransformContext &context );

    void setShowFallbackOption( bool visible );

  signals:

    void operationChanged();

    void operationDoubleClicked();

  private slots:

    void tableCurrentItemChanged( QTableWidgetItem *, QTableWidgetItem * );

    void showSupersededToggled( bool toggled );

    void installGrid();

  private:

    enum Roles
    {
      TransformIdRole = Qt::UserRole + 1,
      ProjRole,
      AvailableRole,
      BoundsRole,
      MissingGridsRole,
      MissingGridPackageNamesRole,
      MissingGridUrlsRole
    };

    bool gridShiftTransformation( const QString &itemText ) const;
    bool testGridShiftFileAvailability( QTableWidgetItem *item ) const;
    void loadAvailableOperations();

    QString formatScope( const QString &scope );

#if PROJ_VERSION_MAJOR>=6
    QList< QgsDatumTransform::TransformDetails > mDatumTransforms;
#else
    QList< QgsDatumTransform::TransformPair > mDatumTransforms;
#endif
    QgsCoordinateReferenceSystem mSourceCrs;
    QgsCoordinateReferenceSystem mDestinationCrs;
    OperationDetails mPreviousOp;
    int mBlockSignals = 0;
};

#endif // QGSCOORDINATEOPERATIONWIDGET_H