rangecontrols.cpp

奇趣公司比较新的qt/emd版本

/*! Returns the scroll bar. */
QScrollBar *QAccessibleScrollBar::scrollBar() const
{
    return qobject_cast<QScrollBar*>(object());
}

/*! \reimp */
QRect QAccessibleScrollBar::rect(int child) const
{
    if (!scrollBar()->isVisible())
        return QRect();

    QStyle::SubControl subControl;
    switch (child) {
    case LineUp:
        subControl = QStyle ::SC_ScrollBarSubLine;
        break;
    case PageUp:
        subControl = QStyle::SC_ScrollBarSubPage;
        break;
    case Position:
        subControl = QStyle::SC_ScrollBarSlider;
        break;
    case PageDown:
        subControl = QStyle::SC_ScrollBarAddPage;
        break;
    case LineDown:
        subControl = QStyle::SC_ScrollBarAddLine;
        break;
    default:
        return QAccessibleAbstractSlider::rect(child);
    }

    const QStyleOptionSlider option = qt_qscrollbarStyleOption(scrollBar());
    const QRect rect = scrollBar()->style()->subControlRect(QStyle::CC_ScrollBar, &option,
                                                       subControl, scrollBar());
    const QPoint tp = scrollBar()->mapToGlobal(QPoint(0,0));
    return QRect(tp.x() + rect.x(), tp.y() + rect.y(), rect.width(), rect.height());
}

/*! \reimp */
int QAccessibleScrollBar::childCount() const
{
    if (!scrollBar()->isVisible())
        return 0;
    return LineDown;
}

/*! \reimp */
QString QAccessibleScrollBar::text(Text t, int child) const
{
    if (!scrollBar()->isVisible())
        return QString();
    switch (t) {
    case Value:
        if (!child || child == Position)
            return QString::number(scrollBar()->value());
        return QString();
    case Name:
        switch (child) {
        case LineUp:
            return QScrollBar::tr("Line up");
        case PageUp:
            return QScrollBar::tr("Page up");
        case Position:
            return QScrollBar::tr("Position");
        case PageDown:
            return QScrollBar::tr("Page down");
        case LineDown:
            return QScrollBar::tr("Line down");
        }
        break;
    default:
        break;
    }
    return QAccessibleAbstractSlider::text(t, child);
}

/*! \reimp */
QAccessible::Role QAccessibleScrollBar::role(int child) const
{
    switch (child) {
    case LineUp:
    case PageUp:
    case PageDown:
    case LineDown:
        return PushButton;
    case Position:
        return Indicator;
    default:
        return ScrollBar;
    }
}

/*! \reimp */
QAccessible::State QAccessibleScrollBar::state(int child) const
{
    const State parentState = QAccessibleAbstractSlider::state(0);

    if (child == 0)
        return parentState;

    // Inherit the Invisible state from parent.
    State state = parentState & QAccessible::Invisible;

    // Disable left/right if we are at the minimum/maximum.
    const QScrollBar * const scrollBar = QAccessibleScrollBar::scrollBar();
    switch (child) {
    case LineUp:
    case PageUp:
        if (scrollBar->value() <= scrollBar->minimum())
            state |= Unavailable;
        break;
    case LineDown:
    case PageDown:
        if (scrollBar->value() >= scrollBar->maximum())
            state |= Unavailable;
        break;
    case Position:
    default:
        break;
    }

    return state;
}
#endif // QT_NO_SCROLLBAR

#ifndef QT_NO_SLIDER
/*!
  \class QAccessibleSlider qaccessiblewidget.h
  \brief The QAccessibleSlider class implements the QAccessibleInterface for sliders.
  \internal

  \ingroup accessibility
*/

/*!
    \enum QAccessibleSlider::SliderElements

    This enum identifies the components of the slider.

    \value SliderSelf The slider as a whole.
    \value PageLeft The area to the left of the position.
    \value Position The position indicator.
    \value PageRight The area to the right of the position.
*/

/*!
  Constructs a QAccessibleScrollBar object for \a w.
  \a name is propagated to the QAccessibleWidgetEx constructor.
*/
QAccessibleSlider::QAccessibleSlider(QWidget *w)
: QAccessibleAbstractSlider(w)
{
    Q_ASSERT(slider());
    addControllingSignal(QLatin1String("valueChanged(int)"));
}

/*! Returns the slider. */
QSlider *QAccessibleSlider::slider() const
{
    return qobject_cast<QSlider*>(object());
}

/*! \reimp */
QRect QAccessibleSlider::rect(int child) const
{
    QRect rect;
    if (!slider()->isVisible())
        return rect;
    const QStyleOptionSlider option = qt_qsliderStyleOption(slider());
    QRect srect = slider()->style()->subControlRect(QStyle::CC_Slider, &option,
                                                    QStyle::SC_SliderHandle, slider());

    switch (child) {
    case PageLeft:
        if (slider()->orientation() == Qt::Vertical)
            rect = QRect(0, 0, slider()->width(), srect.y());
        else
            rect = QRect(0, 0, srect.x(), slider()->height());
        break;
    case Position:
        rect = srect;
        break;
    case PageRight:
        if (slider()->orientation() == Qt::Vertical)
            rect = QRect(0, srect.y() + srect.height(), slider()->width(), slider()->height()- srect.y() - srect.height());
        else
            rect = QRect(srect.x() + srect.width(), 0, slider()->width() - srect.x() - srect.width(), slider()->height());
        break;
    default:
        return QAccessibleAbstractSlider::rect(child);
    }

    QPoint tp = slider()->mapToGlobal(QPoint(0,0));
    return QRect(tp.x() + rect.x(), tp.y() + rect.y(), rect.width(), rect.height());
}

/*! \reimp */
int QAccessibleSlider::childCount() const
{
    if (!slider()->isVisible())
        return 0;
    return PageRight;
}

/*! \reimp */
QString QAccessibleSlider::text(Text t, int child) const
{
    if (!slider()->isVisible())
        return QString();
    switch (t) {
    case Value:
        if (!child || child == 2)
            return QString::number(slider()->value());
        return QString();
    case Name:
        switch (child) {
        case PageLeft:
            return slider()->orientation() == Qt::Horizontal ?
                QSlider::tr("Page left") : QSlider::tr("Page up");
        case Position:
            return QSlider::tr("Position");
        case PageRight:
            return slider()->orientation() == Qt::Horizontal ?
                QSlider::tr("Page right") : QSlider::tr("Page down");
        }
        break;
    default:
        break;
    }
    return QAccessibleAbstractSlider::text(t, child);
}

/*! \reimp */
QAccessible::Role QAccessibleSlider::role(int child) const
{
    switch (child) {
    case PageLeft:
    case PageRight:
        return PushButton;
    case Position:
        return Indicator;
    default:
        return Slider;
    }
}

/*! \reimp */
QAccessible::State QAccessibleSlider::state(int child) const
{
    const State parentState = QAccessibleAbstractSlider::state(0);

    if (child == 0)
        return parentState;

    // Inherit the Invisible state from parent.
    State state = parentState & QAccessible::Invisible;

    // Disable left/right if we are at the minimum/maximum.
    const QSlider * const slider = QAccessibleSlider::slider();
    switch (child) {
    case PageLeft:
        if (slider->value() <= slider->minimum())
            state |= Unavailable;
        break;
    case PageRight:
        if (slider->value() >= slider->maximum())
            state |= Unavailable;
        break;
    case Position:
    default:
        break;
    }

    return state;
}

/*!
    \fn int QAccessibleSlider::defaultAction(int child) const

    Returns the default action for the given \a child. The base class
    implementation returns 0.
*/
int QAccessibleSlider::defaultAction(int /*child*/) const
{
/*
    switch (child) {
    case SliderSelf:
        return SetFocus;
    case PageLeft:
        return Press;
    case PageRight:
        return Press;
    }
*/
    return 0;
}

/*! \internal */
QString QAccessibleSlider::actionText(int /*action*/, Text /*t*/, int /*child*/) const
{
    return QString(QLatin1String(""));
}

QAccessibleAbstractSlider::QAccessibleAbstractSlider(QWidget *w, Role r)
    : QAccessibleWidgetEx(w, r)
{
    Q_ASSERT(qobject_cast<QAbstractSlider *>(w));
}

QVariant QAccessibleAbstractSlider::invokeMethodEx(Method method, int child, const QVariantList &params)
{
    switch (method) {
    case ListSupportedMethods: {
        QSet<QAccessible::Method> set;
        set << ListSupportedMethods;
        return qVariantFromValue(set | qvariant_cast<QSet<QAccessible::Method> >(
                    QAccessibleWidgetEx::invokeMethodEx(method, child, params)));
    }
    default:
        return QAccessibleWidgetEx::invokeMethodEx(method, child, params);
    }
}

QVariant QAccessibleAbstractSlider::currentValue()
{
    return abstractSlider()->value();
}

void QAccessibleAbstractSlider::setCurrentValue(const QVariant &value)
{
    abstractSlider()->setValue(value.toInt());
}

QVariant QAccessibleAbstractSlider::maximumValue()
{
    return abstractSlider()->maximum();
}

QVariant QAccessibleAbstractSlider::minimumValue()
{
    return abstractSlider()->minimum();
}

QAbstractSlider *QAccessibleAbstractSlider::abstractSlider() const
{
    return static_cast<QAbstractSlider *>(object());
}

#endif // QT_NO_SLIDER

#ifndef QT_NO_DIAL
// ======================================= QAccessibleDial ======================================
QAccessibleDial::QAccessibleDial(QWidget *widget)
    : QAccessibleWidgetEx(widget, Dial)
{
    Q_ASSERT(qobject_cast<QDial *>(widget));
    addControllingSignal(QLatin1String("valueChanged(int)"));
}

QRect QAccessibleDial::rect(int child) const
{
    QRect rect;
    if (!dial()->isVisible())
        return rect;
    switch (child) {
    case Self:
        return QAccessibleWidgetEx::rect(child);
    case SpeedoMeter: {
        // Mixture from qcommonstyle.cpp (focus rect).
        int width = dial()->width();
        int height = dial()->height();
        qreal radius = qMin(width, height) / 2.0;
        qreal delta = radius / 6.0;
        qreal dx = delta + (width - 2 * radius) / 2.0;
        qreal dy = delta + (height - 2 * radius) / 2.0;
        rect = QRect(int(dx), int(dy), int(radius * 2 - 2 * delta), int(radius * 2 - 2 * delta));
        if (dial()->notchesVisible()) {
            rect.translate(int(-radius / 6), int(-radius / 6));
            rect.setWidth(rect.width() + int(radius / 3));
            rect.setHeight(rect.height() + int(radius / 3));
        }
        break;
    }
    case SliderHandle: {
        // Mixture from qcommonstyle.cpp and qdial.cpp.
        int sliderValue = !dial()->invertedAppearance() ? dial()->value()
                                                        : (dial()->maximum() - dial()->value());
        qreal angle = 0;
        if (dial()->maximum() == dial()->minimum()) {
            angle = Q_PI / 2;
        } else if (dial()->wrapping()) {
            angle = Q_PI * 3 / 2 - (sliderValue - dial()->minimum()) * 2 * Q_PI
                    / (dial()->maximum() - dial()->minimum());
        } else {
            angle = (Q_PI * 8 - (sliderValue - dial()->minimum()) * 10 * Q_PI
                    / (dial()->maximum() - dial()->minimum())) / 6;
        }

        int width = dial()->rect().width();
        int height = dial()->rect().height();
        int radius = qMin(width, height) / 2;
        int xc = width / 2;
        int yc = height / 2;
        int bigLineSize = radius / 6;
        if (bigLineSize < 4)
            bigLineSize = 4;
        if (bigLineSize > radius / 2)
            bigLineSize = radius / 2;
        int len = radius - bigLineSize - 5;
        if (len < 5)
            len = 5;
        int back = len / 2;

        QPolygonF arrow(3);
        arrow[0] = QPointF(0.5 + xc + len * qCos(angle),
                           0.5 + yc - len * qSin(angle));
        arrow[1] = QPointF(0.5 + xc + back * qCos(angle + Q_PI * 5 / 6),
                           0.5 + yc - back * qSin(angle + Q_PI * 5 / 6));
        arrow[2] = QPointF(0.5 + xc + back * qCos(angle - Q_PI * 5 / 6),
                           0.5 + yc - back * qSin(angle - Q_PI * 5 / 6));
        rect = arrow.boundingRect().toRect();
        break;
    }
    default:
        return QRect();
    }

    QPoint globalPos = dial()->mapToGlobal(QPoint(0,0));
    return QRect(globalPos.x() + rect.x(), globalPos.y() + rect.y(), rect.width(), rect.height());
}

int QAccessibleDial::childCount() const
{
    if (!dial()->isVisible())
        return 0;
    return SliderHandle;
}

QString QAccessibleDial::text(Text textType, int child) const
{
    if (!dial()->isVisible())
        return QString();
    if (textType == Value && child >= Self && child <= SliderHandle)
        return QString::number(dial()->value());
    if (textType == Name) {
        switch (child) {
        case Self:
            if (!widget()->accessibleName().isEmpty())
                return widget()->accessibleName();
            return QDial::tr("QDial");
        case SpeedoMeter:
            return QDial::tr("SpeedoMeter");
        case SliderHandle:
            return QDial::tr("SliderHandle");
        }
    }
    return QAccessibleWidgetEx::text(textType, child);
}

QAccessible::Role QAccessibleDial::role(int child) const
{
    if (child == SpeedoMeter)
        return Slider;
    else if (child == SliderHandle)
        return Indicator;
    return QAccessibleWidgetEx::role(child);
}

QAccessible::State QAccessibleDial::state(int child) const
{
    const State parentState = QAccessibleWidgetEx::state(0);
    if (child == SliderHandle)
        return parentState | HotTracked;
    return parentState;
}

QVariant QAccessibleDial::invokeMethodEx(Method, int, const QVariantList &)
{
    return QVariant();
}

QDial *QAccessibleDial::dial() const
{
    return static_cast<QDial*>(object());
}
#endif // QT_NO_DIAL

#endif // QT_NO_ACCESSIBILITY