ksane_opt_slider.cpp

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/* ============================================================
 *
 * This file is part of the KDE project
 *
 * Date        : 2009-01-21
 * Description : Sane interface for KDE
 *
 * Copyright (C) 2009 by Kare Sars <kare dot sars at iki dot fi>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) version 3, or any
 * later version accepted by the membership of KDE e.V. (or its
 * successor approved by the membership of KDE e.V.), which shall
 * act as a proxy defined in Section 6 of version 3 of the license.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * ============================================================ */
// Local includes
#include "ksane_opt_slider.h"
#include "ksane_opt_slider.moc"

#include "labeled_slider.h"

// Qt includes
#include <QtCore/QVarLengthArray>

// KDE includes
#include <KDebug>
#include <KLocale>

static const int KSW_INT_MAX = 2147483647;
static const int KSW_INT_MIN = -2147483647-1;  // prevent warning


namespace KSaneIface
{

KSaneOptSlider::KSaneOptSlider(const SANE_Handle handle, const int index)
: KSaneOption(handle, index), m_slider(0), m_iVal(0)
{
}

void KSaneOptSlider::createWidget(QWidget *parent)
{
    if (m_widget) return;

    m_widget = m_slider = new LabeledSlider(parent, "", KSW_INT_MIN, KSW_INT_MAX, 1);
    readOption();
    m_widget->setToolTip(i18n(m_optDesc->desc));
    connect(m_slider, SIGNAL(valueChanged(int)), this, SLOT(sliderChanged(int)));
    readValue();
}


void KSaneOptSlider::readValue()
{
    if (state() == STATE_HIDDEN) return;

    // read that current value
    QVarLengthArray<unsigned char> data(m_optDesc->size);
    SANE_Status status;
    SANE_Int res;
    status = sane_control_option (m_handle, m_index, SANE_ACTION_GET_VALUE, data.data(), &res);
    if (status != SANE_STATUS_GOOD) {
        return;
    }
    
    m_iVal = toSANE_Word(data.data());
    if ((m_slider != 0) &&  (m_slider->value() != m_iVal)) {
        m_slider->setValue(m_iVal);
    }
    emit fValueRead((float)m_iVal);
}

void KSaneOptSlider::readOption()
{
    KSaneOption::readOption();

    if (!m_slider) return;

    if (m_optDesc->constraint_type == SANE_CONSTRAINT_RANGE) {
        m_slider->setRange(m_optDesc->constraint.range->min, m_optDesc->constraint.range->max);
        m_slider->setStep(m_optDesc->constraint.range->quant);
    }
    else {
        m_slider->setRange(KSW_INT_MIN, KSW_INT_MAX);
        m_slider->setStep(1);
    }
    m_slider->setSuffix(unitString());
    m_slider->setLabelText(i18n(m_optDesc->title));
}

void KSaneOptSlider::sliderChanged(int val)
{
    if (val == m_iVal) return;
    unsigned char data[4];
    m_iVal = val;
    fromSANE_Word(data, val);
    writeData(data);
}

bool KSaneOptSlider::getMinValue(float &val)
{
    if (m_optDesc->constraint_type == SANE_CONSTRAINT_RANGE) {
        val = (float)m_optDesc->constraint.range->min;
    }
    else {
        val = (float)KSW_INT_MIN;
    }
    return true;
}

bool KSaneOptSlider::getMaxValue(float &val)
{
    if (m_optDesc->constraint_type == SANE_CONSTRAINT_RANGE) {
        val = (float)m_optDesc->constraint.range->max;
    }
    else {
        val = (float)KSW_INT_MAX;
    }
    return true;
}

bool KSaneOptSlider::getValue(float &val)
{
    if (state() == STATE_HIDDEN) return false;
    val = (float)m_iVal;
    return true;
}

bool KSaneOptSlider::setValue(float val)
{
    if (state() == STATE_HIDDEN) return false;
    sliderChanged((int)val);
    readValue();
    return true;
}

bool KSaneOptSlider::getValue(QString &val)
{
    if (state() == STATE_HIDDEN) return false;
    val = QString::number(m_iVal);
    return true;
}

bool KSaneOptSlider::setValue(const QString &val)
{
    if (state() == STATE_HIDDEN) return false;
    sliderChanged(val.toInt());
    readValue();
    return true;
}


}  // NameSpace KSaneIface