qstatusbar.cpp

奇趣公司比较新的qt/emd版本

    \note This function does not delete the widget but \e hides it.
    To add the widget again, you must call both the addWidget() and
    show() functions.

    \sa addWidget(), addPermanentWidget(), clearMessage()
*/

void QStatusBar::removeWidget(QWidget *widget)
{
    if (!widget)
        return;

    Q_D(QStatusBar);
    bool found = false;
    QStatusBarPrivate::SBItem* item;
    for (int i=0; i<d->items.size(); ++i) {
        item = d->items.at(i);
        if (!item)
            break;
        if (item->w == widget) {
            d->items.removeAt(i);
            item->w->hide();
            delete item;
            found = true;
            break;
        }
    }

    if (found)
        reformat();
#if defined(QT_DEBUG)
    else
        qDebug("QStatusBar::removeWidget(): Widget not found.");
#endif
}

/*!
    \property QStatusBar::sizeGripEnabled

    \brief whether the QSizeGrip in the bottom-right corner of the
    status bar is enabled

    The size grip is enabled by default.
*/

bool QStatusBar::isSizeGripEnabled() const
{
#ifdef QT_NO_SIZEGRIP
    return false;
#else
    Q_D(const QStatusBar);
    return !!d->resizer;
#endif
}

void QStatusBar::setSizeGripEnabled(bool enabled)
{
#ifdef QT_NO_SIZEGRIP
    Q_UNUSED(enabled);
#else
    Q_D(QStatusBar);
    if (!enabled != !d->resizer) {
        if (enabled) {
            d->resizer = new QSizeGrip(this);
        } else {
            delete d->resizer;
            d->resizer = 0;
        }
        reformat();
        if (d->resizer && isVisible())
            d->resizer->show();
    }
#endif
}


/*!
    Changes the status bar's appearance to account for item changes.

    Special subclasses may need this function, but geometry management
    will usually take care of any necessary rearrangements.
*/
void QStatusBar::reformat()
{
    Q_D(QStatusBar);
    if (d->box)
        delete d->box;

    QBoxLayout *vbox;
#ifndef QT_NO_SIZEGRIP
    if (d->resizer) {
        d->box = new QHBoxLayout(this);
        d->box->setMargin(0);
        vbox = new QVBoxLayout;
        d->box->addLayout(vbox);
    } else
#endif
    {
        vbox = d->box = new QVBoxLayout(this);
        d->box->setMargin(0);
    }
    vbox->addSpacing(3);
    QBoxLayout* l = new QHBoxLayout;
    vbox->addLayout(l);
    l->addSpacing(2);
    l->setSpacing(6);

    int maxH = fontMetrics().height();

    int i;
    QStatusBarPrivate::SBItem* item;
    for (i=0,item=0; i<d->items.size(); ++i) {
        item = d->items.at(i);
        if (!item || item->p)
            break;
        l->addWidget(item->w, item->s);
        int itemH = qMin(qSmartMinSize(item->w).height(), item->w->maximumHeight());
        maxH = qMax(maxH, itemH);
    }

    l->addStretch(0);

    for (item=0; i<d->items.size(); ++i) {
        item = d->items.at(i);
        if (!item)
            break;
        l->addWidget(item->w, item->s);
        int itemH = qMin(qSmartMinSize(item->w).height(), item->w->maximumHeight());
        maxH = qMax(maxH, itemH);
    }
#ifndef QT_NO_SIZEGRIP
    if (d->resizer) {
        maxH = qMax(maxH, d->resizer->sizeHint().height());
        d->box->addSpacing(1);
        d->box->addWidget(d->resizer, 0, Qt::AlignBottom);
    }
#endif
    l->addStrut(maxH);
    d->savedStrut = maxH;
    vbox->addSpacing(2);
    d->box->activate();
    repaint();
}

/*!
    Hides the normal status indications and displays the given \a
    message for the specified \a timeout milli-seconds (if non-zero),
    or until clearMessage() or another showMessage() is called,
    whichever occurs first.

    \sa messageChanged(), currentMessage(), clearMessage()
*/
void QStatusBar::showMessage(const QString &message, int timeout)
{
    Q_D(QStatusBar);
    if (d->tempItem == message)
        return;

    d->tempItem = message;

    if (timeout > 0) {
        if (!d->timer) {
            d->timer = new QTimer(this);
            connect(d->timer, SIGNAL(timeout()), this, SLOT(clearMessage()));
        }
        d->timer->start(timeout);
    } else if (d->timer) {
        delete d->timer;
        d->timer = 0;
    }

    hideOrShow();
}

/*!
    Removes any temporary message being shown.

    \sa currentMessage(), showMessage(), removeWidget()
*/

void QStatusBar::clearMessage()
{
    Q_D(QStatusBar);
    if (d->tempItem.isEmpty())
        return;
    if (d->timer) {
        delete d->timer;
        d->timer = 0;
    }
    d->tempItem.clear();
    hideOrShow();
}

/*!
    Returns the temporary message currently shown,
    or an empty string if there is no such message.

    \sa showMessage()
*/
QString QStatusBar::currentMessage() const
{
    Q_D(const QStatusBar);
    return d->tempItem;
}

/*!
    \fn void QStatusBar::message(const QString &message, int timeout)

    Use the showMessage() function instead.
*/

/*!
    \fn void QStatusBar::clear()

    Use the clearMessage() function instead.
*/

/*!
    \fn QStatusBar::messageChanged(const QString &message)

    This signal is emitted whenever the temporary status message
    changes. The new temporary message is passed in the \a message
    parameter which is a null-string when the message has been
    removed.

    \sa showMessage(), clearMessage()
*/

/*!
    Ensures that the right widgets are visible.

    Used by the showMessage() and clearMessage() functions.
*/
void QStatusBar::hideOrShow()
{
    Q_D(QStatusBar);
    bool haveMessage = !d->tempItem.isEmpty();

    QStatusBarPrivate::SBItem* item = 0;
    for (int i=0; i<d->items.size(); ++i) {
        item = d->items.at(i);
        if (!item || item->p)
            break;
        if (haveMessage)
            item->w->hide();
        else
            item->w->show();
    }

    emit messageChanged(d->tempItem);
    repaint();
}


/*!
    \reimp
    \fn void QStatusBar::paintEvent(QPaintEvent *event)

    Shows the temporary message, if appropriate, in response to the
    paint \a event.
*/
void QStatusBar::paintEvent(QPaintEvent *)
{
    Q_D(QStatusBar);
    bool haveMessage = !d->tempItem.isEmpty();

    QPainter p(this);
    QStatusBarPrivate::SBItem* item = 0;

    bool rtl = layoutDirection() == Qt::RightToLeft;

    int left = 6;
    int right = width() - 12;

#ifndef QT_NO_SIZEGRIP
    if (d->resizer && d->resizer->isVisible()) {
        if (rtl)
            left = d->resizer->x() + d->resizer->width();
        else
            right = d->resizer->x();
    }
#endif

    for (int i=0; i<d->items.size(); ++i) {
        item = d->items.at(i);
        if (!item)
            break;
        if (!haveMessage || item->p)
            if (item->w->isVisible()) {
                if (item->p) {
                    if (rtl)
                        left = qMax(left, item->w->x() + item->w->width() + 2);
                    else
                        right = qMin(right, item->w->x()-1);
                }
                QStyleOption opt(0);
                opt.rect.setRect(item->w->x() - 2, item->w->y() - 1,
                                 item->w->width() + 4, item->w->height() + 2);
                opt.palette = palette();
                opt.state = QStyle::State_None;
                style()->drawPrimitive(QStyle::PE_FrameStatusBar, &opt, &p, item->w);
            }
    }
    if (haveMessage) {
        p.setPen(palette().foreground().color());
        p.drawText(left, 0, right-left, height(), Qt::AlignLeading | Qt::AlignVCenter | Qt::TextSingleLine, d->tempItem);
    }
}

/*!
    \reimp
*/
void QStatusBar::resizeEvent(QResizeEvent * e)
{
    QWidget::resizeEvent(e);
}

/*!
    \reimp
*/

bool QStatusBar::event(QEvent *e)
{
    Q_D(QStatusBar);

    if (e->type() == QEvent::LayoutRequest
#ifdef QT3_SUPPORT
        || e->type() == QEvent::LayoutHint
#endif
        ) {
        // Calculate new strut height and call reformat() if it has changed
        int maxH = fontMetrics().height();

        QStatusBarPrivate::SBItem* item = 0;
        for (int i=0; i<d->items.size(); ++i) {
            item = d->items.at(i);
            if (!item)
                break;
            int itemH = qMin(qSmartMinSize(item->w).height(), item->w->maximumHeight());
            maxH = qMax(maxH, itemH);
        }

#ifndef QT_NO_SIZEGRIP
        if (d->resizer)
            maxH = qMax(maxH, d->resizer->sizeHint().height());
#endif

        if (maxH != d->savedStrut)
            reformat();
        else
            update();
    }
    if (e->type() == QEvent::ChildRemoved) {
        QStatusBarPrivate::SBItem* item = 0;
        for (int i=0; i<d->items.size(); ++i) {
            item = d->items.at(i);
            if (!item)
                break;
            if (item->w == ((QChildEvent*)e)->child()) {
                d->items.removeAt(i);
                delete item;
            }
        }
    }
    return QWidget::event(e);
}

#endif