qslider.cpp

奇趣公司比较新的qt/emd版本

        mySlider->setObjectName(name);
    \endcode
*/
QSlider::QSlider(Qt::Orientation orientation, QWidget *parent, const char *name)
    : QAbstractSlider(*new QSliderPrivate, parent)
{
    setObjectName(QString::fromAscii(name));
    d_func()->orientation = orientation;
    d_func()->init();
}

/*!
    Use QSlider(), QObject::setObjectName() and the functionality
    inherited from QAbstractSlider instead.

    \oldcode
        QSlider *mySlider = new QSlider(minValue, maxValue, pageStep,
                                        value, orientation, parent, name);
    \newcode
        QSlider *mySlider = new QSlider(orientation, parent);
        mySlider->setObjectName(name);
        mySlider->setMinimum(minValue);
        mySlider->setMaximum(maxValue);
        mySlider->setPageStep(pageStep);
        mySlider->setValue(value);
    \endcode
*/
QSlider::QSlider(int minValue, int maxValue, int pageStep, int value, Qt::Orientation orientation,
                 QWidget *parent, const char *name)
    : QAbstractSlider(*new QSliderPrivate, parent)
{
    Q_D(QSlider);
    setObjectName(QString::fromAscii(name));
    d->minimum = minValue;
    d->maximum = maxValue;
    d->pageStep = pageStep;
    d->position = d->value = value;
    d->orientation = orientation;
    d->init();
}
#endif

/*!
    Destroys this slider.
*/
QSlider::~QSlider()
{
}

/*!
    \reimp
*/
void QSlider::paintEvent(QPaintEvent *)
{
    Q_D(QSlider);
    QPainter p(this);
    QStyleOptionSlider opt;
    initStyleOption(&opt);

    opt.subControls = QStyle::SC_SliderGroove | QStyle::SC_SliderHandle;
    if (d->tickPosition != NoTicks)
        opt.subControls |= QStyle::SC_SliderTickmarks;
    if (d->pressedControl) {
        opt.activeSubControls = d->pressedControl;
        opt.state |= QStyle::State_Sunken;
    } else {
        opt.activeSubControls = d->hoverControl;
    }

    style()->drawComplexControl(QStyle::CC_Slider, &opt, &p, this);
}

/*!
    \reimp
*/

bool QSlider::event(QEvent *event)
{
    Q_D(QSlider);

    switch(event->type()) {
    case QEvent::HoverEnter:
    case QEvent::HoverLeave:
    case QEvent::HoverMove:
        if (const QHoverEvent *he = static_cast<const QHoverEvent *>(event))
            d->updateHoverControl(he->pos());
        break;
    case QEvent::StyleChange:
    case QEvent::MacSizeChange:
        d->resetLayoutItemMargins();
        break;
    default:
        break;
    }
    return QAbstractSlider::event(event);
}

/*!
    \reimp
*/
void QSlider::mousePressEvent(QMouseEvent *ev)
{
    Q_D(QSlider);
    if (d->maximum == d->minimum || (ev->buttons() ^ ev->button())) {
        ev->ignore();
        return;
    }
#ifdef QT_KEYPAD_NAVIGATION
    if (QApplication::keypadNavigationEnabled())
        setEditFocus(true);
#endif
    ev->accept();
    if ((ev->button() & style()->styleHint(QStyle::SH_Slider_AbsoluteSetButtons)) == ev->button()) {
        QStyleOptionSlider opt;
        initStyleOption(&opt);
        const QRect sliderRect = style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderHandle, this);
        const QPoint center = sliderRect.center() - sliderRect.topLeft();
        // to take half of the slider off for the setSliderPosition call we use the center - topLeft

        setSliderPosition(d->pixelPosToRangeValue(d->pick(ev->pos() - center)));
        triggerAction(SliderMove);
        setRepeatAction(SliderNoAction);
        d->pressedControl = QStyle::SC_SliderHandle;
        update();
    } else if ((ev->button() & style()->styleHint(QStyle::SH_Slider_PageSetButtons)) == ev->button()) {
        QStyleOptionSlider opt;
        initStyleOption(&opt);
        d->pressedControl = style()->hitTestComplexControl(QStyle::CC_Slider,
                                                           &opt, ev->pos(), this);
        SliderAction action = SliderNoAction;
        if (d->pressedControl == QStyle::SC_SliderGroove) {
            const QRect sliderRect = style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderHandle, this);
            int pressValue = d->pixelPosToRangeValue(d->pick(ev->pos() - sliderRect.center() + sliderRect.topLeft()));
            d->pressValue = pressValue;
            if (pressValue > d->value)
                action = SliderPageStepAdd;
            else if (pressValue < d->value)
                action = SliderPageStepSub;
            if (action) {
                triggerAction(action);
                setRepeatAction(action);
            }
        }
    } else {
        ev->ignore();
        return;
    }

    if (d->pressedControl == QStyle::SC_SliderHandle) {
        QStyleOptionSlider opt;
        initStyleOption(&opt);
        setRepeatAction(SliderNoAction);
        QRect sr = style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderHandle, this);
        d->clickOffset = d->pick(ev->pos() - sr.topLeft());
        d->snapBackPosition = d->position;
        update(sr);
        setSliderDown(true);
    }
}

/*!
    \reimp
*/
void QSlider::mouseMoveEvent(QMouseEvent *ev)
{
    Q_D(QSlider);
    if (d->pressedControl != QStyle::SC_SliderHandle) {
        ev->ignore();
        return;
    }
    ev->accept();
    int newPosition = d->pixelPosToRangeValue(d->pick(ev->pos()) - d->clickOffset);
    QStyleOptionSlider opt;
    initStyleOption(&opt);
    int m = style()->pixelMetric(QStyle::PM_MaximumDragDistance, &opt, this);
    if (m >= 0) {
        QRect r = rect();
        r.adjust(-m, -m, m, m);
        if (!r.contains(ev->pos())) {
            newPosition = d->snapBackPosition;
    }
    }
    setSliderPosition(newPosition);
}


/*!
    \reimp
*/
void QSlider::mouseReleaseEvent(QMouseEvent *ev)
{
    Q_D(QSlider);
    if (d->pressedControl == QStyle::SC_None || ev->buttons()) {
        ev->ignore();
        return;
    }
    ev->accept();
    QStyle::SubControl oldPressed = QStyle::SubControl(d->pressedControl);
    d->pressedControl = QStyle::SC_None;
    setRepeatAction(SliderNoAction);
    if (oldPressed == QStyle::SC_SliderHandle)
        setSliderDown(false);
    QStyleOptionSlider opt;
    initStyleOption(&opt);
    opt.subControls = oldPressed;
    update(style()->subControlRect(QStyle::CC_Slider, &opt, oldPressed, this));
}

/*!
    \reimp
*/
QSize QSlider::sizeHint() const
{
    Q_D(const QSlider);
    ensurePolished();
    const int SliderLength = 84, TickSpace = 5;
    QStyleOptionSlider opt;
    initStyleOption(&opt);
    int thick = style()->pixelMetric(QStyle::PM_SliderThickness, &opt, this);
    if (d->tickPosition & TicksAbove)
        thick += TickSpace;
    if (d->tickPosition & TicksBelow)
        thick += TickSpace;
    int w = thick, h = SliderLength;
    if (d->orientation == Qt::Horizontal) {
        w = SliderLength;
        h = thick;
    }
    return style()->sizeFromContents(QStyle::CT_Slider, &opt, QSize(w, h), this).expandedTo(QApplication::globalStrut());
}

/*!
    \reimp
*/
QSize QSlider::minimumSizeHint() const
{
    Q_D(const QSlider);
    QSize s = sizeHint();
    QStyleOptionSlider opt;
    initStyleOption(&opt);
    int length = style()->pixelMetric(QStyle::PM_SliderLength, &opt, this);
    if (d->orientation == Qt::Horizontal)
        s.setWidth(length);
    else
        s.setHeight(length);
    return s;
}

/*!
    \property QSlider::tickPosition
    \brief the tickmark position for this slider

    The valid values are described by the QSlider::TickPosition enum.

    The default value is \l QSlider::NoTicks.

    \sa tickInterval
*/

void QSlider::setTickPosition(TickPosition position)
{
    Q_D(QSlider);
    d->tickPosition = position;
    d->resetLayoutItemMargins();
    update();
    updateGeometry();
}

QSlider::TickPosition QSlider::tickPosition() const
{
    return d_func()->tickPosition;
}

/*!
    \fn TickPosition QSlider::tickmarks() const
    \compat

    Use tickPosition() instead.
*/

/*!
    \fn QSlider::setTickmarks(TickPosition position)
    \compat

    Use setTickPosition() instead.
*/

/*!
    \property QSlider::tickInterval
    \brief the interval between tickmarks

    This is a value interval, not a pixel interval. If it is 0, the
    slider will choose between lineStep() and pageStep().

    The default value is 0.

    \sa tickPosition, lineStep(), pageStep()
*/

void QSlider::setTickInterval(int ts)
{
    d_func()->tickInterval = qMax(0, ts);
    update();
}

int QSlider::tickInterval() const
{
    return d_func()->tickInterval;
}

/*!
    \fn void QSlider::addStep()

    Use setValue() instead.
*/

/*!
    \fn void QSlider::subtractStep()

    Use setValue() instead.
*/

/*! \internal
    Returns the style option for slider.
*/
Q_GUI_EXPORT QStyleOptionSlider qt_qsliderStyleOption(QSlider *slider)
{
    QStyleOptionSlider sliderOption;
    slider->initStyleOption(&sliderOption);
    return sliderOption;
}

#endif