qgstransactiongroup.h

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/***************************************************************************
  qgstransactiongroup.h - QgsTransactionGroup
 
 ---------------------
 begin                : 15.1.2016
 copyright            : (C) 2016 by Matthias Kuhn
 email                : mmatthias@opengis.ch
 ***************************************************************************
 *                                                                         *
 *   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 QGSTRANSACTIONGROUP_H
#define QGSTRANSACTIONGROUP_H
 
#include <memory>
 
#include "qgis_core.h"
#include "qgstransaction.h"
 
#include <QObject>
#include <QSet>
 
class QgsVectorLayer;

class CORE_EXPORT QgsTransactionGroup : public QObject
{
    Q_OBJECT
  public:
    explicit QgsTransactionGroup( QObject *parent = nullptr );

    bool addLayer( QgsVectorLayer *layer );

    QSet<QgsVectorLayer *> layers() const;

    bool modified() const;

    QString connString() const;

    QString providerKey() const;

    bool isEmpty() const;
 
  signals:

    void commitError( const QString &msg );
 
  private slots:
    void onEditingStarted();
    void onLayerDeleted();
    void onBeforeCommitChanges( bool stopEditing );
    void onRollback();
 
  private:
    bool mEditingStopping = false;
 
    void disableTransaction();
 
    void restartTransaction( const QgsVectorLayer *layer );
 
    QSet<QgsVectorLayer *> mLayers;
    std::unique_ptr<QgsTransaction> mTransaction;
    QString mConnString;
    QString mProviderKey;
};
 
#endif // QGSTRANSACTIONGROUP_H