threadedtask.h

/*
    This file is part of Cute Chess.

    Cute Chess 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 3 of the License, or
    (at your option) any later version.

    Cute Chess 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Cute Chess.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef THREADEDTASK_H
#define THREADEDTASK_H

#include <QThread>
#include <QTime>
class QWidget;
class QProgressDialog;

class ThreadedTask : public QThread
{
    Q_OBJECT

    public:
        explicit ThreadedTask(const QString& title,
                      const QString& labelText,
                      int minimum,
                      int maximum,
                      QWidget* parent);
        virtual ~ThreadedTask();

    signals:
        void progressValueChanged(int value);
        void statusMessageChanged(const QString& message);

    protected:
        bool cancelRequested() const;

        QString humaniseTime(int sec) const;
    
    private slots:
        // Yes, QThread subclasses shouldn't normally have slots
        // because they're executed in the wrong thread. But in this
        // case it doesn't matter because we're just setting a flag.
        void cancel();

        void updateProgress(int value);
        void setStatusMessage(const QString& msg);

    private:
        bool m_cancel;
        QString m_statusMessage;
        QTime m_taskStart;
        int m_lastUpdate;
        QProgressDialog* m_dlg;
};

#endif // THREADEDTASK_H