qgroupbox.cpp

奇趣公司比较新的qt/emd版本

            d->pressedControl = QStyle::SC_None;
            if (toggle)
                d->click();
            return true;
        }
        break;
    }
    default:
        break;
    }
    return QWidget::event(e);
}

/*!\reimp */
void QGroupBox::childEvent(QChildEvent *c)
{
    Q_D(QGroupBox);
    if (c->type() != QEvent::ChildAdded || !c->child()->isWidgetType())
        return;
    QWidget *w = (QWidget*)c->child();
    if (d->checkable) {
        if (d->checked) {
            if (!w->testAttribute(Qt::WA_ForceDisabled))
                w->setEnabled(true);
        } else {
            if (w->isEnabled()) {
                w->setEnabled(false);
                w->setAttribute(Qt::WA_ForceDisabled, false);
            }
        }
    }
}


/*!
    \internal

    This private slot finds a widget in this group box that can accept
    focus, and gives the focus to that widget.
*/

void QGroupBoxPrivate::_q_fixFocus(Qt::FocusReason reason)
{
    Q_Q(QGroupBox);
    QWidget *fw = q->focusWidget();
    if (!fw) {
        QWidget * best = 0;
        QWidget * candidate = 0;
        QWidget * w = q;
        while ((w = w->nextInFocusChain()) != q) {
            if (q->isAncestorOf(w) && (w->focusPolicy() & Qt::TabFocus) == Qt::TabFocus && w->isVisibleTo(q)) {
                if (!best && qobject_cast<QRadioButton*>(w) && ((QRadioButton*)w)->isChecked())
                    // we prefer a checked radio button or a widget that
                    // already has focus, if there is one
                    best = w;
                else
                    if (!candidate)
                        // but we'll accept anything that takes focus
                        candidate = w;
            }
        }
        if (best)
            fw = best;
        else
            if (candidate)
                fw = candidate;
    }
    if (fw)
        fw->setFocus(reason);
}

/*
    Sets the right frame rect depending on the title.
*/
void QGroupBoxPrivate::calculateFrame()
{
    Q_Q(QGroupBox);
    QStyleOptionGroupBox box;
    q->initStyleOption(&box);
    QRect contentsRect = q->style()->subControlRect(QStyle::CC_GroupBox, &box, QStyle::SC_GroupBoxContents, q);
    q->setContentsMargins(contentsRect.left() - box.rect.left(), contentsRect.top() - box.rect.top(),
                          box.rect.right() - contentsRect.right(), box.rect.bottom() - contentsRect.bottom());
    setLayoutItemMargins(QStyle::SE_GroupBoxLayoutItem, &box);
}

/*! \reimp
 */
void QGroupBox::focusInEvent(QFocusEvent *fe)
{ // note no call to super
    Q_D(QGroupBox);
    if (focusPolicy() == Qt::NoFocus) {
        d->_q_fixFocus(fe->reason());
    } else {
        QStyleOptionGroupBox box;
        initStyleOption(&box);
        QRect rect = style()->subControlRect(QStyle::CC_GroupBox, &box, QStyle::SC_GroupBoxCheckBox, this)
            | style()->subControlRect(QStyle::CC_GroupBox, &box, QStyle::SC_GroupBoxLabel, this);
        update(rect);
    }
}


/*!
  \reimp
*/
QSize QGroupBox::minimumSizeHint() const
{
    Q_D(const QGroupBox);
    QStyleOptionGroupBox option;
    initStyleOption(&option);

    QFontMetrics metrics(fontMetrics());

    int baseWidth = metrics.width(d->title) + metrics.width(QLatin1Char(' '));
    int baseHeight = metrics.height();
    if (d->checkable) {
        baseWidth += style()->pixelMetric(QStyle::PM_IndicatorWidth);
        baseWidth += style()->pixelMetric(QStyle::PM_CheckBoxLabelSpacing);
        baseHeight = qMax(baseHeight, style()->pixelMetric(QStyle::PM_IndicatorHeight));
    }

    QSize size = style()->sizeFromContents(QStyle::CT_GroupBox, &option, QSize(baseWidth, baseHeight), this);
    return size.expandedTo(QWidget::minimumSizeHint());
}

/*!
    \property QGroupBox::flat
    \brief whether the group box is painted flat or has a frame

    A group box usually consists of a surrounding frame with a title
    at the top. If this property is enabled, only the top part of the frame is
    drawn in most styles; otherwise the whole frame is drawn.

    By default, this property is disabled; i.e. group boxes are not flat unless
    explicitly specified.

    \bold{Note:} In some styles, flat and non-flat group boxes have similar
    representations and may not be as distinguishable as they are in other
    styles.

    \sa title
*/
bool QGroupBox::isFlat() const
{
    Q_D(const QGroupBox);
    return d->flat;
}

void QGroupBox::setFlat(bool b)
{
    Q_D(QGroupBox);
    if (d->flat == b)
        return;
    d->flat = b;
    updateGeometry();
    update();
}


/*!
    \property QGroupBox::checkable
    \brief whether the group box has a checkbox in its title

    If this property is true, the group box displays its title using
    a checkbox in place of an ordinary label. If the checkbox is checked,
    the group box's children are enabled; otherwise they are disabled and
    inaccessible.

    By default, group boxes are not checkable.

    If this property is enabled for a group box, it will also be initially
    checked to ensure that its contents are enabled.

    \sa checked
*/
void QGroupBox::setCheckable(bool checkable)
{
    Q_D(QGroupBox);

    bool wasCheckable = d->checkable;
    d->checkable = checkable;

    if (checkable) {
        setChecked(true);
        if (!wasCheckable) {
            setFocusPolicy(Qt::StrongFocus);
            d->_q_setChildrenEnabled(true);
            updateGeometry();
        }
    } else {
        if (wasCheckable) {
            setFocusPolicy(Qt::NoFocus);
            d->_q_setChildrenEnabled(true);
            updateGeometry();
        }
        d->_q_setChildrenEnabled(true);
    }

    if (wasCheckable != checkable) {
        d->calculateFrame();
        update();
    }
}

bool QGroupBox::isCheckable() const
{
    Q_D(const QGroupBox);
    return d->checkable;
}


bool QGroupBox::isChecked() const
{
    Q_D(const QGroupBox);
    return d->checkable && d->checked;
}


/*!
    \fn void QGroupBox::toggled(bool on)

    If the group box is checkable, this signal is emitted when the check box
    is toggled. \a on is true if the check box is checked; otherwise it is false.

    \sa checkable
*/


/*!
    \fn void QGroupBox::clicked(bool checked)
    \since 4.2

    This signal is emitted when the check box is activated (i.e. pressed down
    then released while the mouse cursor is inside the button), or when the
    shortcut key is typed, Notably, this signal is \e not emitted if you call
    setChecked().

    If the check box is checked \a checked is true; it is false if the check
    box is unchecked.

    \sa checkable, toggled(), checked
*/

/*!
    \property QGroupBox::checked
    \brief whether the group box is checked

    If the group box is checkable, it is displayed with a check box.
    If the check box is checked, the group box's children are enabled;
    otherwise the children are disabled and are inaccessible to the user.

    By default, checkable group boxes are also checked.

    \sa checkable
*/
void QGroupBox::setChecked(bool b)
{
    Q_D(QGroupBox);
    if (d->checkable) {
        if (d->checked != b)
            update();
        bool wasToggled = (b != d->checked);
        d->checked = b;
        if (wasToggled) {
            d->_q_setChildrenEnabled(b);
            emit toggled(b);
        }
    }
}

/*
  sets all children of the group box except the qt_groupbox_checkbox
  to either disabled/enabled
*/
void QGroupBoxPrivate::_q_setChildrenEnabled(bool b)
{
    Q_Q(QGroupBox);
    QObjectList childList = q->children();
    for (int i = 0; i < childList.size(); ++i) {
        QObject *o = childList.at(i);
        if (o->isWidgetType()) {
            QWidget *w = static_cast<QWidget *>(o);
            if (b) {
                if (!w->testAttribute(Qt::WA_ForceDisabled))
                    w->setEnabled(true);
            } else {
                if (w->isEnabled()) {
                    w->setEnabled(false);
                    w->setAttribute(Qt::WA_ForceDisabled, false);
                }
            }
        }
    }
}

/*! \reimp */
void QGroupBox::changeEvent(QEvent *ev)
{
    Q_D(QGroupBox);
    if (ev->type() == QEvent::EnabledChange) {
        if (d->checkable && isEnabled()) {
            // we are being enabled - disable children
            if (!d->checked)
                d->_q_setChildrenEnabled(false);
        }
    } else if (ev->type() == QEvent::FontChange
#ifdef Q_WS_MAC
               || ev->type() == QEvent::MacSizeChange
#endif
               || ev->type() == QEvent::StyleChange) {
        d->calculateFrame();
    }
    QWidget::changeEvent(ev);
}

/*! \reimp */
void QGroupBox::mousePressEvent(QMouseEvent *event)
{
    Q_D(QGroupBox);
    QStyleOptionGroupBox box;
    initStyleOption(&box);
    d->pressedControl = style()->hitTestComplexControl(QStyle::CC_GroupBox, &box,
                                                       event->pos(), this);
    if (d->checkable && (d->pressedControl & (QStyle::SC_GroupBoxCheckBox | QStyle::SC_GroupBoxLabel)))
        update(style()->subControlRect(QStyle::CC_GroupBox, &box, QStyle::SC_GroupBoxCheckBox, this));
}

/*! \reimp */
void QGroupBox::mouseMoveEvent(QMouseEvent *event)
{
    Q_D(QGroupBox);
    QStyleOptionGroupBox box;
    initStyleOption(&box);
    QStyle::SubControl pressed = style()->hitTestComplexControl(QStyle::CC_GroupBox, &box,
                                                                event->pos(), this);
    if (d->pressedControl == QStyle::SC_GroupBoxCheckBox && d->pressedControl != pressed)
        update(style()->subControlRect(QStyle::CC_GroupBox, &box, QStyle::SC_GroupBoxCheckBox, this));
}

/*! \reimp */
void QGroupBox::mouseReleaseEvent(QMouseEvent *)
{
    Q_D(QGroupBox);
    QStyleOptionGroupBox box;
    initStyleOption(&box);
    bool toggle = d->checkable && (d->pressedControl == QStyle::SC_GroupBoxLabel
                   || d->pressedControl == QStyle::SC_GroupBoxCheckBox);
    d->pressedControl = QStyle::SC_None;
    if (toggle)
        d->click();
}

#ifdef QT3_SUPPORT
/*!
    Use one of the constructors that doesn't take the \a name
    argument and then use setObjectName() instead.
*/
QGroupBox::QGroupBox(QWidget *parent, const char *name)
    : QWidget(*new QGroupBoxPrivate, parent, 0)
{
    Q_D(QGroupBox);
    setObjectName(QString::fromAscii(name));
    d->init();
}

/*!
    Use one of the constructors that doesn't take the \a name
    argument and then use setObjectName() instead.
*/
QGroupBox::QGroupBox(const QString &title, QWidget *parent, const char *name)
    : QWidget(*new QGroupBoxPrivate, parent, 0)
{
    Q_D(QGroupBox);
    setObjectName(QString::fromAscii(name));
    d->init();
    setTitle(title);
}
#endif // QT3_SUPPORT

#include "moc_qgroupbox.cpp"

#endif //QT_NO_GROUPBOX