// krazy:excludeall=copyright,license
/*
Copyright (c) 2011, Andre Somers
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of the Rathenau Instituut, Andre Somers nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL ANDRE SOMERS AND/OR RATHENAU INSTITUTE BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
Found at  http://qt-project.org/wiki/Delay_action_to_wait_for_user_interaction
modified/simplified by Thomas Fischer
*/
#ifndef DELAYEDEXECUTIONTIMER_H
#define DELAYEDEXECUTIONTIMER_H

#include <QObject>
class QTimer;

/**
  Class to delay execution an action in response to events that may come in bursts
  */
class DelayedExecutionTimer : public QObject
{
    Q_OBJECT
public:
    explicit DelayedExecutionTimer(int maximumDelay = 1000, int minimumDelay = 250, QObject *parent = 0);
    explicit DelayedExecutionTimer(QObject *parent);

    /**
      The minimum delay is the time the class will wait after being triggered before
      emitting the triggered() signals.
      */
    void setMinimumDelay(int delay) {
        m_minimumDelay = delay;
    }
    int minimumDelay() const {
        return m_minimumDelay;
    }
    /**
      The maximum delay is the maximum time that will pass before a call to the trigger() slot
      leads to a triggered() signal.
      */
    void setMaximumDelay(int delay) {
        m_maximumDelay = delay;
    }
    int maximumDelay() const {
        return m_maximumDelay;
    }

    /**
     * Toggle if this timer is reacting on trigger signals.
     * This timer may still send out trigger events itself.
     * @param isEnabled timer will react if set to true
     */
    void setEnabled(bool isEnabled) {
        m_isEnabled = isEnabled;
    }

signals:
    void triggered();

public slots:
    void trigger();

private slots:
    void timeout();

private:
    bool m_isEnabled;
    int m_minimumDelay;
    int m_maximumDelay;

    QTimer *m_minimumTimer;
    QTimer *m_maximumTimer;
};

#endif // DELAYEDEXECUTIONTIMER_H


