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/***************************************************************************
LowPassDialog.h - dialog for the "lowpass" plugin
-------------------
begin : Fri Mar 07 2003
copyright : (C) 2003 by Thomas Eschenbacher
email : Thomas.Eschenbacher@gmx.de
***************************************************************************/
/***************************************************************************
* *
* 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 LOW_PASS_DIALOG_H
#define LOW_PASS_DIALOG_H
#include "config.h"
#include <QDialog>
#include <QObject>
#include <QString>
#include "libkwave/PluginSetupDialog.h"
#include "ui_LowPassDlg.h"
namespace Kwave
{
class LowPassFilter;
class LowPassDialog: public QDialog,
public Ui::LowPassDlg,
public Kwave::PluginSetupDialog
{
Q_OBJECT
public:
/**
* Constructor.
* @param parent parent widget
* @param sample_rate sample rate of the audio data to be processed,
* needed for determining the allowed range of
* the cutoff frequency
*/
LowPassDialog(QWidget *parent, double sample_rate);
/** Destructor */
~LowPassDialog() override;
/** Returns the parameters as string list */
QStringList params() override;
/** Sets the from a list of parameters */
void setParams(QStringList ¶ms) override;
/** retruns a pointer to this as a QDialog */
QDialog *dialog() override { return this; }
signals:
/**
* Emitted whenever the frequency changes
* @param freq the frequency parameter in Hz
*/
void changed(double freq);
/** Pre-listen mode has been started */
void startPreListen();
/** Pre-listen mode has been stopped */
void stopPreListen();
protected slots:
/** called when the spinbox or spinbox value has changed */
void valueChanged(int pos);
/**
* called when the "Listen" button has been toggled,
* to start or stop the pre-listen mode
*/
void listenToggled(bool listen);
/**
* called when the pre-listen mode stopped/aborted
*/
void listenStopped();
private slots:
/** invoke the online help */
void invokeHelp();
protected:
/** Update the graphic display */
void updateDisplay();
private:
/** the cutoff frequency in Hz */
double m_frequency;
/** sample rate of the signal in samples/sec */
double m_sample_rate;
/** filter function for calculating the frequency response */
Kwave::LowPassFilter *m_filter;
};
}
#endif /* LOW_PASS_DIALOG_H */
//***************************************************************************
//***************************************************************************
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