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QAbstractSliderPrivate::QAbstractSliderPrivate()

    : minimum(0), maximum(99), singleStep(1), pageStep(10),

      value(0), position(0), pressValue(-1), tracking(true), blocktracking(false), pressed(false),

      invertedAppearance(false), invertedControls(false),

      orientation(Qt::Horizontal), repeatAction(QAbstractSlider::SliderNoAction)

{

}

QAbstractSliderPrivate::~QAbstractSliderPrivate()

{

}

oid QAbstractSlider::setRange(int min, int max)

{

    Q_D(QAbstractSlider);

    int oldMin = d->minimum;

    int oldMax = d->maximum;

    d->minimum = min;

    d->maximum = qMax(min, max);

    if (oldMin != d->minimum || oldMax != d->maximum) {

        sliderChange(SliderRangeChange);

        emit rangeChanged(d->minimum, d->maximum);

        setValue(d->value); // re-bound

    }

}

void QAbstractSliderPrivate::setSteps(int single, int page)

{

    Q_Q(QAbstractSlider);

    singleStep = qAbs(single);

    pageStep = qAbs(page);

    q->sliderChange(QAbstractSlider::SliderStepsChange);

}

AbstractSlider::QAbstractSlider(QWidget *parent)

    :QWidget(*new QAbstractSliderPrivate, parent, 0)

{

}

QAbstractSlider::QAbstractSlider(QAbstractSliderPrivate &dd, QWidget *parent)

    :QWidget(dd, parent, 0)

{

}

QAbstractSlider::~QAbstractSlider()

{

}

void QAbstractSlider::setOrientation(Qt::Orientation orientation)

{

    Q_D(QAbstractSlider);

    if (d->orientation == orientation)

        return;

    d->orientation = orientation;

    if (!testAttribute(Qt::WA_WState_OwnSizePolicy)) {

        QSizePolicy sp = sizePolicy();

        sp.transpose();

        setSizePolicy(sp);

        setAttribute(Qt::WA_WState_OwnSizePolicy, false);

    }

    update();

    updateGeometry();

}

Qt::Orientation QAbstractSlider::orientation() const

{

    Q_D(const QAbstractSlider);

    return d->orientation;

}

void QAbstractSlider::setMinimum(int min)

{

    Q_D(QAbstractSlider);

    setRange(min, qMax(d->maximum, min));

}

int QAbstractSlider::minimum() const

{

    Q_D(const QAbstractSlider);

    return d->minimum;

}

void QAbstractSlider::setMaximum(int max)

{

    Q_D(QAbstractSlider);

    setRange(qMin(d->minimum, max), max);

}

int QAbstractSlider::maximum() const

{

    Q_D(const QAbstractSlider);

    return d->maximum;

}

void QAbstractSlider::setSingleStep(int step)

{

    Q_D(QAbstractSlider);

    d->setSteps(step, d->pageStep);

}

int QAbstractSlider::singleStep() const

{

    Q_D(const QAbstractSlider);

    return d->singleStep;

}

void QAbstractSlider::setPageStep(int step)

{

    Q_D(QAbstractSlider);

    d->setSteps(d->singleStep, step);

}

int QAbstractSlider::pageStep() const

{

    Q_D(const QAbstractSlider);

    return d->pageStep;

}

oid QAbstractSlider::setTracking(bool enable)

{

    Q_D(QAbstractSlider);

    d->tracking = enable;

}

bool QAbstractSlider::hasTracking() const

{

    Q_D(const QAbstractSlider);

    return d->tracking;

}

void QAbstractSlider::setSliderDown(bool down)

{

    Q_D(QAbstractSlider);

    bool doEmit = d->pressed != down;

    d->pressed = down;

    if (doEmit) {

        if (down)

            emit sliderPressed();

        else

            emit sliderReleased();

    }

    if (!down && d->position != d->value)

        triggerAction(SliderMove);

}

bool QAbstractSlider::isSliderDown() const

{

    Q_D(const QAbstractSlider);

    return d->pressed;

}

void QAbstractSlider::setSliderPosition(int position)

{

    Q_D(QAbstractSlider);

    position = d->bound(position);

    if (position == d->position)

        return;

    d->position = position;

    if (!d->tracking)

        update();

    if (d->pressed)

        emit sliderMoved(position);

    if (d->tracking && !d->blocktracking)

        triggerAction(SliderMove);

}

int QAbstractSlider::sliderPosition() const

{

    Q_D(const QAbstractSlider);

    return d->position;

}

int QAbstractSlider::value() const

{

    Q_D(const QAbstractSlider);

    return d->value;

}

//! [0]

void QAbstractSlider::setValue(int value)

//! [0]

{

    Q_D(QAbstractSlider);

    value = d->bound(value);

    if (d->value == value && d->position == value)

        return;

    d->value = value;

    if (d->position != value) {

        d->position = value;

        if (d->pressed)

            emit sliderMoved((d->position = value));

    }

#ifndef QT_NO_ACCESSIBILITY

//! [1]

    QAccessible::updateAccessibility(this, 0, QAccessible::ValueChanged);

//! [1]

#endif

    sliderChange(SliderValueChange);

    emit valueChanged(value);

//! [2]

}

//! [2]

bool QAbstractSlider::invertedAppearance() const

{

    Q_D(const QAbstractSlider);

    return d->invertedAppearance;

}

void QAbstractSlider::setInvertedAppearance(bool invert)

{

    Q_D(QAbstractSlider);

    d->invertedAppearance = invert;

    update();

}

bool QAbstractSlider::invertedControls() const

{

    Q_D(const QAbstractSlider);

    return d->invertedControls;

}

void QAbstractSlider::setInvertedControls(bool invert)

{

    Q_D(QAbstractSlider);

    d->invertedControls = invert;

}

void QAbstractSlider::triggerAction(SliderAction action)

{

    Q_D(QAbstractSlider);

    d->blocktracking = true;

    switch (action) {

    case SliderSingleStepAdd:

        setSliderPosition(d->value + d->singleStep);

        break;

    case SliderSingleStepSub:

        setSliderPosition(d->value - d->singleStep);

        break;

    case SliderPageStepAdd:

        setSliderPosition(d->value + d->pageStep);

        break;

    case SliderPageStepSub:

        setSliderPosition(d->value - d->pageStep);

        break;

    case SliderToMinimum:

        setSliderPosition(d->minimum);

        break;

    case SliderToMaximum:

        setSliderPosition(d->maximum);

        break;

    case SliderMove:

    case SliderNoAction:

        break;

    };

    emit actionTriggered(action);

    d->blocktracking = false;

    setValue(d->position);

}

void QAbstractSlider::setRepeatAction(SliderAction action, int thresholdTime, int repeatTime)

{

    Q_D(QAbstractSlider);

    if ((d->repeatAction = action) == SliderNoAction) {

        d->repeatActionTimer.stop();

    } else {

        d->repeatActionTime = repeatTime;

        d->repeatActionTimer.start(thresholdTime, this);

    }

}

QAbstractSlider::SliderAction QAbstractSlider::repeatAction() const

{

    Q_D(const QAbstractSlider);

    return d->repeatAction;

}

void QAbstractSlider::timerEvent(QTimerEvent *e)

{

    Q_D(QAbstractSlider);

    if (e->timerId() == d->repeatActionTimer.timerId()) {

        if (d->repeatActionTime) { // was threshold time, use repeat time next time

            d->repeatActionTimer.start(d->repeatActionTime, this);

            d->repeatActionTime = 0;

        }

        if (d->repeatAction == SliderPageStepAdd)

            d->setAdjustedSliderPosition(d->value + d->pageStep);

        else if (d->repeatAction == SliderPageStepSub)

            d->setAdjustedSliderPosition(d->value - d->pageStep);

        else

            triggerAction(d->repeatAction);

    }

}

oid QAbstractSlider::sliderChange(SliderChange)

{

    update();

}

#ifndef QT_NO_WHEELEVENT

void QAbstractSlider::wheelEvent(QWheelEvent * e)

{

    Q_D(QAbstractSlider);

    e->ignore();

    if (e->orientation() != d->orientation && !rect().contains(e->pos()))

        return;

    static qreal offset = 0;

    static QAbstractSlider *offset_owner = 0;

    if (offset_owner != this){

        offset_owner = this;

        offset = 0;

    }

    int step = qMin(QApplication::wheelScrollLines() * d->singleStep, d->pageStep);

    if ((e->modifiers() & Qt::ControlModifier) || (e->modifiers() & Qt::ShiftModifier))

        step = d->pageStep;

    offset += e->delta() * step / 120;

    if (d->invertedControls)

        offset = -offset;

    if (qAbs(offset) < 1)

        return;

    int prevValue = d->value;

    d->position = d->value + int(offset); // value will be updated by triggerAction()

    triggerAction(SliderMove);

    if (prevValue == d->value) {

        offset = 0;

    } else {

        offset -= int(offset);

        e->accept();

    }

}

#endif

void QAbstractSlider::keyPressEvent(QKeyEvent *ev)

{

    Q_D(QAbstractSlider);

    SliderAction action = SliderNoAction;

    switch (ev->key()) {

#ifdef QT_KEYPAD_NAVIGATION

        case Qt::Key_Select:

            if (QApplication::keypadNavigationEnabled())

                setEditFocus(!hasEditFocus());

            else

                ev->ignore();

            break;

        case Qt::Key_Back:

            if (QApplication::keypadNavigationEnabled() && hasEditFocus()) {

                setValue(d->origValue);

                setEditFocus(false);

            } else

                ev->ignore();

            break;

#endif

        // It seems we need to use invertedAppearance for Left and right, otherwise, things look weird.

        case Qt::Key_Left:

#ifdef QT_KEYPAD_NAVIGATION

            if (QApplication::keypadNavigationEnabled() && !hasEditFocus()) {

                ev->ignore();

                return;

            }

            if (QApplication::keypadNavigationEnabled() && d->orientation == Qt::Vertical)

                action = d->invertedControls ? SliderSingleStepSub : SliderSingleStepAdd;

            else

#endif

            action = !d->invertedAppearance ? SliderSingleStepSub : SliderSingleStepAdd;

            break;

        case Qt::Key_Right:

#ifdef QT_KEYPAD_NAVIGATION

            if (QApplication::keypadNavigationEnabled() && !hasEditFocus()) {

                ev->ignore();

                return;

            }

            if (QApplication::keypadNavigationEnabled() && d->orientation == Qt::Vertical)

                action = d->invertedControls ? SliderSingleStepAdd : SliderSingleStepSub;

            else

#endif

            action = !d->invertedAppearance ? SliderSingleStepAdd : SliderSingleStepSub;

            break;

        case Qt::Key_Up:

#ifdef QT_KEYPAD_NAVIGATION

            if (QApplication::keypadNavigationEnabled()) {

                ev->ignore();

                break;

            }

#endif

            action = d->invertedControls ? SliderSingleStepSub : SliderSingleStepAdd;

            break;

        case Qt::Key_Down:

#ifdef QT_KEYPAD_NAVIGATION

            if (QApplication::keypadNavigationEnabled()) {

                ev->ignore();

                break;

            }

#endif

            action = d->invertedControls ? SliderSingleStepAdd : SliderSingleStepSub;

            break;

        case Qt::Key_PageUp:

            action = d->invertedControls ? SliderPageStepSub : SliderPageStepAdd;

            break;

        case Qt::Key_PageDown:

            action = d->invertedControls ? SliderPageStepAdd : SliderPageStepSub;

            break;

        case Qt::Key_Home:

            action = SliderToMinimum;

            break;

        case Qt::Key_End:

            action = SliderToMaximum;

            break;

        default:

            ev->ignore();

            break;

    }

    if (action)

        triggerAction(action);

}

void QAbstractSlider::changeEvent(QEvent *ev)

{

    Q_D(QAbstractSlider);

    switch (ev->type()) {

    case QEvent::EnabledChange:

        if (!isEnabled()) {

            d->repeatActionTimer.stop();

            setSliderDown(false);

        }

        // fall through...

    default:

        QWidget::changeEvent(ev);

    }

}

bool QAbstractSlider::event(QEvent *e)

{

#ifdef QT_KEYPAD_NAVIGATION

    Q_D(QAbstractSlider);

    switch (e->type()) {

    case QEvent::FocusIn:

        d->origValue = d->value;

        break;

    default:

        break;

    }

#endif

    return QWidget::event(e);

}