FileSystemWatcher.h

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#ifndef WS_UTIL_FILESYSTEMWATCHER_H_INCLUDED
#define WS_UTIL_FILESYSTEMWATCHER_H_INCLUDED
/*
 * Copyright 2011-2016 Universiteit Antwerpen
 *
 * Licensed under the EUPL, Version 1.1 or  as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at: http://ec.europa.eu/idabc/eupl5
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing
 * permissions and limitations under the Licence.
 */
#include <iostream>
#include <functional>
#include <QFileSystemWatcher>

namespace SimShell {
namespace Ws {
namespace Util {

class FileSystemWatcher : public QObject
{
        Q_OBJECT
public:
        FileSystemWatcher(const std::string& path, std::function<void()> callback)
                : p(path),
                  c(callback),
                  active(false)
        {
                w.addPath(QString::fromStdString(p));

                SetActive(true);
        }

        FileSystemWatcher(FileSystemWatcher&& other)
                : p(move(other.p)),
                  c(move(other.c)),
                  active(false)
        {
                w.addPath(QString::fromStdString(p));

                SetActive(other.active);
        }

        bool IsActive() const
        {
                return active;
        }

        void SetActive(bool a)
        {
                if (active != a) {
                        if (a) {
                                connect(&w, SIGNAL(directoryChanged(const QString&)), this, SLOT(SLOT_Changed(const QString&)));
                                connect(&w, SIGNAL(fileChanged(const QString&)), this, SLOT(SLOT_Changed(const QString&)));
                        } else {
                                disconnect(&w, 0, 0, 0); // disconnect everything connected to w's signals.
                        }
                        active = a;
                }
        }

private slots:
        void SLOT_Changed(const QString& ) {
                c();
        }

private:
        QFileSystemWatcher      w;
        std::string             p;
        std::function<void()>   c;
        bool                    active;
};

} // namespace
} // namespace
} // namespace

#endif // end_of_inclde_guard