File: progressreceiver.h

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/* nobleNote, a note taking application
 * Copyright (C) 2012 Christian Metscher <hakaishi@web.de>,
                      Fabian Deuchler <Taiko000@gmail.com>

 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:

 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.

 * nobleNote is licensed under the MIT, see `http://copyfree.org/licenses/mit/license.txt'.
 */

#ifndef PROGRESSRECEIVER_H
#define PROGRESSRECEIVER_H

#include <QObject>
#include <QEvent>
#include <QTime>

/**
 * @brief The ProgressReceiver class can be used to set the values of a progress bar
 * if a lenghty operation runs in a separate thread. You must call postProgressEvent() in the separate thread.
 * the separate thread does not need an event queue.
 */


class ProgressReceiver : public QObject
{
    Q_OBJECT
public:
    explicit ProgressReceiver(QObject *parent = 0);

    // the minimum intervall beweteen two events that are received by progress receiver
    void setInterval(int interval){ interval_ = interval; }
    int interval() const { return interval_; }

    // the current value of the internal progress counter
    void setValue(int value){ value_ = value; }
    int value() const { return value_; }

    // post a progress event to itself that will be posted on a event queue at least every interval ms
    // and will be processed by this object's event method which will increase the value() and send valueChanged
    // this method is not thread safe, but it is usually called in 1 other thread
    void postProgressEvent();


    //override
    virtual bool event ( QEvent * e );
    
signals:

    void valueChanged(int value);
    
public slots:


private:
    struct ProgressEvent : public QEvent
    {
        ProgressEvent( Type type) : QEvent(type), value(0)
        {
        }

        int value;
    };

    int interval_;
    int value_;
    QTime time_;
    
};

#endif // PROGRESSRECEIVER_H