Kwave::LowPassDialog Class Reference

#include <LowPassDialog.h>

Inheritance diagram for Kwave::LowPassDialog:

Collaboration diagram for Kwave::LowPassDialog:

Signals
void	changed (double freq)
void	startPreListen ()
void	stopPreListen ()

Public Member Functions
	LowPassDialog (QWidget *parent, double sample_rate)
virtual	~LowPassDialog () Q_DECL_OVERRIDE
virtual QStringList	params () Q_DECL_OVERRIDE
virtual void	setParams (QStringList &params) Q_DECL_OVERRIDE
virtual QDialog *	dialog () Q_DECL_OVERRIDE
Public Member Functions inherited from Kwave::PluginSetupDialog
virtual	~PluginSetupDialog ()

Protected Slots
void	valueChanged (int pos)
void	listenToggled (bool listen)
void	listenStopped ()

Protected Member Functions
void	updateDisplay ()

Private Slots
void	invokeHelp ()

Private Attributes
double	m_frequency
double	m_sample_rate
Kwave::LowPassFilter *	m_filter

Detailed Description

Definition at line 38 of file LowPassDialog.h.

Constructor & Destructor Documentation

LowPassDialog()

Kwave::LowPassDialog::LowPassDialog	(	QWidget *	parent,
		double	sample_rate
	)

Constructor.

Parameters

parent	parent widget
sample_rate	sample rate of the audio data to be processed, needed for determining the allowed range of the cutoff frequency

Definition at line 42 of file LowPassDialog.cpp.

References Kwave::connect(), invokeHelp(), listenToggled(), m_filter, m_frequency, Kwave::toInt(), updateDisplay(), and valueChanged().

    :QDialog(parent), Ui::LowPassDlg(), Kwave::PluginSetupDialog(),
     m_frequency(3500),
     m_sample_rate(sample_rate), m_filter(Q_NULLPTR)
{
    setupUi(this);
    setModal(true);

    // set maximum frequency to sample rate / 2
    double f_max = sample_rate / 2.0;

    slider->setMaximum(Kwave::toInt(f_max));
    spinbox->setMaximum(Kwave::toInt(f_max));

    // initialize the frequency scale widget
    scale_freq->setMinMax(0, Kwave::toInt(f_max));
    scale_freq->setLogMode(false);
    scale_freq->setUnit(i18n("Hz"));

    // initialize the attenuation scale widget
    scale_db->setMinMax(-24, +6);
    scale_db->setLogMode(false);
    scale_db->setUnit(i18n("dB"));

    // initialize the frequency response widget
    freq_response->init(f_max, -24, +6);

    // set up the low pass filter dunction
    m_filter = new Kwave::LowPassFilter();
    freq_response->setFilter(m_filter);

    // initialize the controls and the curve display
    slider->setValue(Kwave::toInt(m_frequency));
    spinbox->setValue(Kwave::toInt(m_frequency));
    updateDisplay();

    // changes in the slider or spinbox
    connect(spinbox, SIGNAL(valueChanged(int)),
            this, SLOT(valueChanged(int)));
    // click to the "Listen" button
    connect(btListen, SIGNAL(toggled(bool)),
            this, SLOT(listenToggled(bool)));

    // expand the "Listen" button to it's maximum width
    listenToggled(true);
    if (btListen->width() > btListen->minimumWidth())
        btListen->setMinimumWidth(btListen->width());
    listenToggled(false);
    if (btListen->width() > btListen->minimumWidth())
        btListen->setMinimumWidth(btListen->width());

    // set the initial size of the dialog
    int h = (width() * 3) / 5;
    if (height() < h) resize(width(), h);
    int w = (height() * 5) / 3;
    if (width() < w) resize(w, height());

    connect(buttonBox_Help->button(QDialogButtonBox::Help), SIGNAL(clicked()),
            this,   SLOT(invokeHelp()));

    // set the focus onto the "OK" button
    buttonBox->button(QDialogButtonBox::Ok)->setFocus();
}

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~LowPassDialog()

Kwave::LowPassDialog::~LowPassDialog ( )

virtual

Destructor

Definition at line 107 of file LowPassDialog.cpp.

References listenToggled(), and m_filter.

{
    // better stop pre-listen now
    listenToggled(false);

    if (freq_response) freq_response->setFilter(Q_NULLPTR);
    if (m_filter) delete m_filter;
}

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Member Function Documentation

changed

void Kwave::LowPassDialog::changed ( double  freq )

signal

Emitted whenever the frequency changes

Parameters

freq	the frequency parameter in Hz

Referenced by dialog(), and valueChanged().

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dialog()

virtual QDialog* Kwave::LowPassDialog::dialog ( )

inlinevirtual

retruns a pointer to this as a QDialog

Implements Kwave::PluginSetupDialog.

Definition at line 64 of file LowPassDialog.h.

References changed(), invokeHelp(), listenStopped(), listenToggled(), startPreListen(), stopPreListen(), updateDisplay(), and valueChanged().

{ return this; }

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invokeHelp

void Kwave::LowPassDialog::invokeHelp ( )

privateslot

invoke the online help

Definition at line 185 of file LowPassDialog.cpp.

References _.

Referenced by dialog(), and LowPassDialog().

{
    KHelpClient::invokeHelp(_("plugin_sect_lowpass"));
}

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listenStopped

void Kwave::LowPassDialog::listenStopped ( )

protectedslot

called when the pre-listen mode stopped/aborted

Definition at line 179 of file LowPassDialog.cpp.

Referenced by dialog().

{
    if (!btListen) btListen->setChecked(false);
}

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listenToggled

void Kwave::LowPassDialog::listenToggled ( bool  listen )

protectedslot

called when the "Listen" button has been toggled, to start or stop the pre-listen mode

Definition at line 162 of file LowPassDialog.cpp.

References startPreListen(), and stopPreListen().

Referenced by dialog(), LowPassDialog(), and ~LowPassDialog().

{
    Q_ASSERT(btListen);
    if (!btListen) return;

    if (listen) {
        // start pre-listen mode
        emit startPreListen();
        btListen->setText(i18n("&Stop"));
    } else {
        // stop pre-listen mode
        emit stopPreListen();
        btListen->setText(i18n("&Listen"));
    }
}

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params()

QStringList Kwave::LowPassDialog::params ( )

virtual

Returns the parameters as string list

Implements Kwave::PluginSetupDialog.

Definition at line 128 of file LowPassDialog.cpp.

References m_frequency.

{
    QStringList list;
    list << QString::number(m_frequency);
    return list;
}

setParams()

void Kwave::LowPassDialog::setParams ( QStringList &  params )

virtual

Sets the from a list of parameters

Implements Kwave::PluginSetupDialog.

Definition at line 136 of file LowPassDialog.cpp.

References m_frequency, Kwave::toInt(), and updateDisplay().

{
    // evaluate the parameter list
    bool ok;
    double frequency = params[0].toDouble(&ok);
    Q_ASSERT(ok);
    if (ok) m_frequency = frequency;

    slider->setValue(Kwave::toInt(m_frequency));
    spinbox->setValue(Kwave::toInt(m_frequency));

    updateDisplay();
}

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startPreListen

void Kwave::LowPassDialog::startPreListen ( )

signal

Pre-listen mode has been started

Referenced by dialog(), and listenToggled().

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stopPreListen

void Kwave::LowPassDialog::stopPreListen ( )

signal

Pre-listen mode has been stopped

Referenced by dialog(), and listenToggled().

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updateDisplay()

void Kwave::LowPassDialog::updateDisplay ( )

protected

Update the graphic display

Definition at line 151 of file LowPassDialog.cpp.

References m_filter, m_frequency, m_sample_rate, and Kwave::LowPassFilter::setFrequency().

Referenced by dialog(), LowPassDialog(), setParams(), and valueChanged().

{
    double fs = m_sample_rate;
    if (m_filter && (fs > 0.0))
    {
        m_filter->setFrequency(QVariant(2.0 * M_PI * m_frequency / fs));
        if (freq_response) freq_response->repaint();
    }
}

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valueChanged

void Kwave::LowPassDialog::valueChanged ( int  pos )

protectedslot

called when the spinbox or spinbox value has changed

Definition at line 117 of file LowPassDialog.cpp.

References changed(), m_frequency, Kwave::toInt(), and updateDisplay().

Referenced by dialog(), and LowPassDialog().

{
    if (Kwave::toInt(m_frequency) != pos) {
        m_frequency = pos;
        updateDisplay();

        emit changed(m_frequency);
    }
}

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Member Data Documentation

m_filter

Kwave::LowPassFilter* Kwave::LowPassDialog::m_filter

private

filter function for calculating the frequency response

Definition at line 115 of file LowPassDialog.h.

Referenced by LowPassDialog(), updateDisplay(), and ~LowPassDialog().

m_frequency

double Kwave::LowPassDialog::m_frequency

private

the cutoff frequency in Hz

Definition at line 109 of file LowPassDialog.h.

Referenced by LowPassDialog(), params(), setParams(), updateDisplay(), and valueChanged().

m_sample_rate

double Kwave::LowPassDialog::m_sample_rate

private

sample rate of the signal in samples/sec

Definition at line 112 of file LowPassDialog.h.

Referenced by updateDisplay().

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The documentation for this class was generated from the following files:

• plugins/lowpass/LowPassDialog.h
• plugins/lowpass/LowPassDialog.cpp